YARN WINDING MACHINE AND YARN WINDING METHOD
BACKGROUND OF THE INVENT]ON
1. Field of the Invention
The present invent j-on rel-ates to a yarn winding
machine including a yarn accumulating section.
Specifically, the present invention relates to a control
of an accumufated amount of the yarn accumulating section.
2. Description of the Re1ated Art
JP 20L2-197135 A discl-oses a yarn winding machine
having a configuration in which a yarn accumulating section
(accumulator) is arranged between a yarn supplying section
and a winding section. The yarn accumul-ating section is
configured to wind and temporarily accumulate the yarn
supplied from the yarn supplying section. The winding
section pul1s out and winds the yarn accumul-ated on the yarn
accumul-ating section to form a package. Thus, by
interposing the yarn accumul-ating section between the yarn
supplying section and the winding section, the yarn can be
continuously unwound at a desired yarn unwinding speed
d.uring winding of the yarn, thus increasing the
productivity in the winding of the yarn.
JP 2012-197135 A also discl-oses a control for
maintaining the amount (accumu1ated amount) of yarn
accumulated in the yarn accumul-ating section constant. fn
other words, the yarn winding machine described in JP
20L2-1,91135 A rotates the winding drum at a speed in which
the yarn winding speed becomes sl-ower than the yarn
unwinding speed when the accumulated amount is greater than
a defined upper limit amount.
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accumul-ated amount gradually reduces. When the
accumul-ated amount is less than or equal to the defined
upper limit amount, the winding drum is rotated at a speed
in which the yarn winding speed becomes sl-ower than the yarn
unwinding speed. Accordingly, the accumufated amount
gradually increases. Therefore, by repeating the above
processes, the accumul-ated amount of the yarn can be
maintained constant.
BRIEE SUMMARY OE THE INVENTION
The inventors recognj-zed that, in the configuration
of JP 20L2-191135 A, slip may occur between the winding drum
and the package. Furthermore, the weight of the package
increases and the inertia becomes larger as the yarn is
wound into the package, and hence the package becomes
difficult to rotate. Thus, it is difficult to accurately
control the yarn winding speed in the configuration of JP
2012-197135 A. fn order to reliably reduce the accumul-ated
amount in the process of 5205 in JP 2012-197135 A, the
rotation speed of the winding drum needs to be set fast with
a margin so that the yarn winding speed reliably becomes
faster than the yarn unwinding speed. Similarly, in order
to reliably increase the accumul-ated amount in the process
of 5206 in JP 2012-197135 A, the rotation speed of the
winding drum needs to be set sl-ow with a margin so that the
yarn winding speed reliably becomes sLower than the yarn
unwinding speed.
As described above, in the control of JP 2072-197135
A, the rotation speed of the winding drum needs to be greatly
fluctuated with a margin. Thus, the winding speed of the
yarn may greatly increase and decrease repeatedly in the
control of JP 2012-197135 A. However, in terms of
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stabilizing the winding of the yarn and producing a high
quality package, the variation width of the yarn winding
speed is preferably made as smal-I as possible. Therefore,
the configuration of JP 2072-191 135 A still can be improved
in terms of enhancing the stability j-n the winding of the
yarn.
The present invention has been made in view of the
above circumstances, and a main object thereof is to reduce
fl-uctuation in the winding speed by the control of the
accumul-ated amount of the yarn accumulating section.
The probl-em to be sol-ved by the present invention is
as described above. The means for sol-ving such a problem
and effects thereof will be described below.
According to one aspect of the present invention, a
yarn wj-ndlng machine having the fol-lowing configuration is
provided. In other words, the yarn winding machine
includes a yarn supplying section, a yarn accumul-ating
section, a winding section, a detecting section, an
20 entrance speed adjustment device, an exit speed adjustment
devj-ce, and a control sectj-on. The yarn supplying section
is in a yarn suppliable state. The yarn accumulating
section is configured to accumulate a yarn supplied from
the yarn supplying section. The winding section is
configured to wind the yarn accumulated in the yarn
accumul-ating section to form a package. The detecting
section is configured to detect information associated with
an accumulated amount of the yarn in the yarn accumul-ating
section. The entrance speed adjustment device is
configured to adjust a speed of the yarn entering the yarn
accumul-ating section. The exit speed adjustment device is
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configured to adjust a speed of the yarn exiting from the
yarn accumulating section. The control- section is
configured to carry out an accumulated amount control- of
adjusting the accumufated amount by carrying out the
adjustment of the speed of the yarn by the entrance speed
adjustment device and/or the exit speed adjustment device
within a range of a predetermined adjustment width. The
control- section carries out an adjustment width reduction
control- of reducing the adjustment width to a target value
based on the information detected by the detecting section.
BRIEF DESCRIPTION OE THE DRAWINGS
FIG. 1 is a side view of a winding unit in an automatic
winder according to one embodiment of the present
invention;
FIG. 2 Ls a side view illustrating a state where a
yarn is in a disconnected state between a yarn supplyJ-ng
section and a yarn accumulating section;
FIG. 3 is a side view describing a state of guiding
the yarn to a yarn joining device,'
FIG. 4 is a side view illustrating a state during a
yarn joining operation;
EIG. 5 is a side view describing a state where a yarn
supplying bobbin is supplied;
FIG. 6 is a side view describing a state of blowing
away the yarn of the yarn supplying bobbin towards
downstream;
EIG. 7 is a
FIG. 8 is
control,'
FIG. 9 is a
block diagram of a control section;
a f lowchart of an accumul-ated amount
view describing change in an output and
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an exit speed of a sensor when the accumulated amount
control is carri-ed out;
FIG. 10 is a flowchart of an adjustment width
reduction control;
FIG. 11A is a graph il-l-ustrating a case in which an
amount reducing process period is longer than an amount
lncreasing process period, and EIG. 118 is a graph
ill-ustrating the result of the accumul-ated amount reduction
control,'
FIG. 12A is a graph illustrating a case in which the
amount reducing process period is shorter than the amount
increasing process period, and FIG. 728 is a graph
ill-ustrating the resul-t of the accumul-ated amount reduction
control;
EIG. 13 is a graph describing a state where an
adjustment width is gradually reduced;
FIG. 74 is a ffowchart of an adjustment width
maintaining control; and
EIG. 15A is a graph illustrating a case in which the
amount reducing process period is longer than the amount
j-ncreasing process period, and FIG. 158 is a graph
ill-ustrating the result of the adjustment width maintaining
control.
DETAILED DESCRIPTION OE PREFERRED EMBODIMENTS
An embodiment of the present j-nvention will be
described below. FIG. 1 is a schematic side view of a
winding unj-t (yarn winding machine) 2 tn an automatic winder
according to an embodiment of the present invention. The
automatic winder of the present embodiment has a
configuration in which a plurality of winding units 2 are
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arranged in a line. The automatic winder afso incl-udes a
machine management device (not ill-ustrated) f or
col-lectively managing the winding units 2.
The winding unit 2 incl-udes a control section 25. The
control section 25 is configured by a hardware such as a
CPU, a ROM, a RAM, and the like (not illustrated), and
software such as a control program stored in the RAM. Each
confj-guration of the winding unit 2 ts control-l-ed by the
cooperative operation of the hardware and the software.
The control- section 25 may be arranged in the machine
management device.
Each control- sectj-on 25 is configured to be abl-e to
communicate with the machine management device. The
operation of the plurality of winding unj-ts 2 in the
automatic winder thus can be col-lectively managed in the
machj-ne management device.
As i1l-ustrated in FIG. 1, the winding unit 2 includes
a yarn supplying section 7 and a winding section B as main
components. The winding unit 2 is configured to wind a yarn
(spun yarn) 20 supplied from the yarn supplying section 7
into a package 30. FIG. 1 i1lustrates a state of the winding
unit 2 at the time of normal winding. Herein, "at the time
of normal winding" refers to a state where the yarn 20 is
in continuation between a yarn supplying bobbin 21 and the
package 30, and the yarn 20 is unwound from the yarn
supptying bobbin 21 and the yarn 20 is wound into the package
30.
The yarn supplying sectj-on 7 is configured so that
the yarn supplying bobbin 27 can be hel-d in a substantially
upright state. The yarn (spun yarn) 20 produced by a
spinning machine (not iIl-ustrated) is wound around the yarn
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suppl-ying bobbin 21. The yarn 20 is unwound from the yarn
supplying bobbin 21 held by the yarn supplying secti-on 7,
and supplied towards the downstream (towards the winding
section 8 ) . In the f ol-l-owing description, "upstream" and
"downstream" respectively refer to upstream and downstream
when seen in a travel-l-ing direction of the yarn 20.
The winding section 8 includes a cradle 23, a winding
drum 24, and a drum drive motor (exit speed adjustment
device) 19.
The winding drum 24 is configured to be rotatably
driven by the drum drive motor 19. The drive speed of the
drum drive motor 19 is controlled by the control section
25. The crad1e 23 is configured to rotatably support a
winding bobbin 22. The cradle 23 is al-so configured to
bring the supporting winding bobbi-n 22 j-nto contact with
the outer circumferent j-al- surface of the winding drum 24.
When the winding drum 24 ts rotatably driven with the
winding bobbin 22brought into contact with the winding drum
24, the winding bobb:-n 22 is rotatably driven and the yarn
20 is wound around the circumferential- surface of the
winding bobbin 22. The winding bobbin 22 wound with the
yarn 20 is referred to as the package 30. A traverse groove
(not illustrated) is formed on the outer circumferentialsurface
of the winding drum 24, so that the yarn 20 can be
traversed at a predetermined width by the traverse groove.
With the above configuratj-on, the yarn 20 can be wound into
the package 30 while being traversed.
The winding unit 2 includes varj-ous types of devices
on a yarn travel-l-ing path between the yarn supplying section
7 and the winding secti-on B. Specifically, an unwinding
assisting devi-ce 10, a tension applying device L2, a yarn
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trap 15, a cutter 76, a yarn monitoring device 77, and a
yarn accumulating section 18 are arranged on the yarn
travelling path in order from the yarn supplying section
7 towards the winding section 8.
The unwindj-ng assisting device 10 causes a movabl-e
member 40 to make contact with a bal-l-oon formed at an upper
part of the yarn supplying bobbin 21 when the yarn 20 unwound
from the yarn supplying bobbin 2L is swung around, and
appropriately controls the s tze of the bal-1oon to assist
the unwinding of the yarn 20.
The tension applying device 12 applies a
predetermined tension on the travelli-ng yarn 20. The
tension applying device 12 of the present embodiment is a
gate-type having two comb teeth. By having the two comb
teeth in a meshed state and causing the yarn 20 to travel
between the comb teeth, an appropriate tension can be
applied on the travelling yarn 20. The meshed state of the
comb teeth can be adjusted. As a matter of course, the
configuration of the tension applyrng device 72 is not
l-imited thereto, and a disc-type tension applying devj-ce
can be adopted, for example.
The yarn trap 15 is arranged between a yarn joining
device 14 (to be described l-ater) and the yarn accumulating
secti-on 18. A distal end of the yarn trap 15 is formed as
a tubul-ar member, and is arranged close to the travelling
path of the yarn 20 and connected to a negative pressure
source (not il-lustrated). With this configuration, a
suction air fl-ow is generated at the distal- end of the yarn
trap 15, and contamj-nants such as fIy waste attached to the
travelling yarn 20 can be sucked and removed.
The yarn monitoring device (clearer) 17 is configured
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to detect a yarn defect (yarn flaw) such as slub by
monitoring the yarn thickness of the yarn 20. When a yarn
defect is detected, the yarn monitoring device 17 transmits
a disconnecting signal instructing the cutting and the
removal of the re1evant yarn defect to the control- section
25 and the like. The cutter 16 for immediately cutting the
yarn 20 tn response to the disconnecting signal is arranged
in proximity to the yarn monitoring device 71.
The yarn accumul-ating section 18 is configured to
temporarily accumulate the yarn 20 unwound from the yarn
supplying bobbin 21. As illustrated in EIG. 7, the yarn
accumul-ating section 18 includes a yarn accumulating rol-l-er
32 and a rol-ler drive motor (entrance speed adjustment
device) 33 as main components.
The yarn accumulating roller 32 is formed as a
cylindrical member made of metal-, and is configured to
accumulate a predetermined amount of yarn 20 by winding the
yarn 20 around the outer circumferentj-al- surface thereof.
The roll-er drive motor 33 is configured to rotatably drive
the yarn accumulating rol-l-er 32 with a center axis line
thereof as the center. The drive speed of the roller drive
motor 33 is ,controlled by the control section 25.
When the roller drive motor 33 is driven with the yarn
20 wound around the yarn accumufating roIler 32 and the yarn
accumul-ating roller 32 is rotated, the yarn 20 l-ocated
upstream (on the yarn supplying section 7 side) of the yarn
accumul-ating section 18 can be pulled. The yarn 20 thus
can be unwound from the yarn supplying bobbin 21, and the
yarn 20 can be wound around the surface of the yarn
accumul-ating rol-Ier 32. Therefore, the rol-l-er drive motor
33 has a function of driving the yarn 20 entering from the
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yarn accumulating roll-er 32 by rotatably driving the yarn
accumulating roll-er 32.
The travelling speed of the yarn 20 unwound from the
yarn supplying bobbin 27 and wound around the yarn
accumulating roll-er 32 ts the speed of the yarn 20 entering
the yarn accumul-ating section 18, and is thus referred to
as "entrance speed". The entrance speed can be adjusted
by controlling the drive speed of the rol-l-er drive motor
33. In this regard, the roller drive motor 33 can be
referred to as the "entrance speed adjustment devi-ce". If
slip is not occurring between the outer cj-rcumferential
surface of the yarn accumul-ating roll-er 32 and the yarn 20,
the entrance speed can be assumed to coincide with the
circumferential speed of the yarn accumulating roller 32.
In the winding unit 2 of the present embodiment, at
the time of the normal- winding, the speed of unwinding the
yarn 20 of the yarn supplying bobbin 27 i-s made maximum
within a range in which the unwinding can be normally
carried out. The production efficiency of the package 30
in the winding unit 2 thus can be maximized by constantly
unwinding the yarn 20 of the yarn supplying bobbin 2I aL
the maximum speed. The control sect:-on 25 of the present
embodiment thus control-s the drive speed of the roller drive
motor 33 (entrance speed adjustment device) to be constant
so as to maintain the speed, at which the yarn 20 of the
yarn supplying bobbin 2t ts unwound, at the maximum speed
at the time of the normal winding.
In the winding section B, the drum drive motor 19 is
dri-ven to rotate the package 30, so that the yarn 20 on the
yarn accumulating roller 32 can be pulIed towards the
downstream. The yarn 20 on the yarn accumulating roIler
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32 thus can be unwound from the downstream end of the yarn
accumul-ating rol-Ier 32, and wound into the package 30. The
drum drive motor 19 thus has a function of driving the yarn
20 exiting from the yarn accumulating roller 32by rotatably
driving the package 30.
The travelling speed of the yarn 20 unwound from the
yarn accumul-ating roller and wound into the package 30 is
the travelling speed of the yarn 20 exiting from the yarn
accumufating section 18, and is thus referred to as "exit
speed". The exit speed can be adjusted by controlling the
drive speed of the drum drive motor 19. In this regard,
the drum drive motor 19 can be referred to as the "exit speed
adjustment device".
A rubber band (O-ring) 3B is fitted to the downstream
end of the yarn accumul-ating roLler 32, and the yarn 20 is
pu1Ied out from the yarn accumul-ating roller 32 from between
the rubber band 38 and the surface of the yarn accumul-ating
rol-l-er 32. With the above conf iguration, an appropriate
tensj-on by the tightening of the rubber band 38 can be
applied on the yarn 20 unwound from the yarn accumufating
roller 32, and hence the unwi-ndinq of the yarn 20 can be
stabili zed .
Next, the process in a case where the yarn flaw is
detected by the yarn monj-toring device L7, and the yarn 20
is cut by the cutter 16 will be described.
When the yarn 20 is cut by the cutter 16, the yarn
20 becomes a dj-sconnected state between the yarn
accumufating section 1B and the yarn supplying section 7,
as illustrated in FIG. 2. Thus, when the yarn 20 is in the
disconnected state between the yarn accumufating section
18 and the yarn supptying section 7, the control section
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25 stops the drive of the roller drive motor 33 to stop the
rotation of the yarn accumulating roll-er 32.
The control sect Lon 25 then performs the yarn joining
operation of connecting the yarn 20 in the disconnected
state. The yarn joining device L4 for connecting (joining)
the yarn 20 from the yarn supplying section 7 and the yarn
20 from the yarn accumulating section 1B is arranged between
the yarn supplying section 7 and the yarn accumulating
section 18 (specifically, between the tension applying
device 72 and the yarn monitoring device Ll).
The yarn joining device 74 of the present embodiment
is configured as a pneumatic splicer device for twisting
and connecting the two yarn ends by acting a whirling
aj-rflow on the yarn end from the yarn supplying section 7
and the yarn end from the yarn accumulating section 18.
However, the yarn joining device 14 is not l-imited thereto,
and may be a mechanical- knotter device, for example.
When the yarn 20 is cut by the cutter 16, the yarn
(l-ower yarn 20a) from the yarn supplying section 7 is sucked
and caught by the yarn trap 15, and introduced to the yarn
joining devj-ce 74 (state of FIG. 2).
The control section 25 appropr:iately controfs the
roller drive motor 33 to reversely rotate the yarn
accumulating roller 32. Accordingly, the yarn (upper yarn
20b) is unwound from the upstream end of the yarn
accumul-ating roll-er 32. Furthermore, the control section
25 operates an upper yarn bl-ow-away device 4B arranged in
proximity to the upstream end of the yarn accumul-ating
rol-l-er 32. The upper yarn bl-ow-away device 48 is configured
to blow away the upper yarn 20b unwound from the yarn
accumul-ating roller 32 by ejecting compressed air (FIG. 3) .
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The upper yarn 20b blown away by the upper yarn blow-away
device 48 is guided to an upper yarn catching section 13
by a curved guide member 60.
The upper yarn catching section 13 is arranged on the
upstream of the yarn joining device 14, and is configured
to suck and catch the upper yarn 20b guided by the curved
guide member 60. The upper yarn 20b is sucked and caught
by the upper yarn catching section 13, so that the upper
yarn 20b is introduced to the yarn joining device 14 (state
of EIG. 4) .
When the l-ower yarn 20a and the upper yarn 20b are
introduced to the yarn joining device 14 in the above manner,
the control sect :-on 25 operates the yarn joining device 14.
Thus, the l-ower yarn 20a and the upper yarn 20b are joined.
While the yarn joining device 1,4 is performing the
yarn joining operation, the yarn 20 from the yarn supplying
section 7 cannot be wound around the yarn accumulating
roller 32. During the yarn joining operation by the yarn
joining device 14, the control section 25 thus stops the
drive of the rol-Ier drive motor 33 to stop the rotation of
the yarn accumulating rolIer 32.
However, since a predetermj-ned amount of yarn 20 is
accumufated on the yarn accumufating rol-ler 32, Lhe winding
of the yarn 20 by the winding section 8 can be continued
even during the yarn joining operation. The controf
section 25 is configured to continue the drive of the drum
drive motor 19 even during the yarn joining operation, so
that the winding of the yarn 20 by the winding section 8
i-s continued.
The yarn winding machine of the present embodiment
is thus abl-e to continue the winding by the winding section
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8 even during the yarn joining operation. The production
efficiency of the package 30 in the winding section 8 thus
can be enhanced. Furthermore, the damages on the yarn 20
can be suppressed since the stopping of the rotation of the
package 30 in the winding section 8 is reduced. The yarn
quality is thus not affected.
After the yarn joining operation by the yarn joining
device 14 is completed, the control_ sect:-on 25 starts the
drive of the roll-er dri-ve motor 33 to resume the rotation
of the yarn accumul-ating rol-l-er 32. The unwinding of the
yarn 20 of the yarn supplying bobbin 21 thus can be resumed.
Next, the replacing operation of the yarn supplying
bobbin 27 will- be descri-bed.
As the yarn 20 is unwound from the yarn supplying
bobbin 21, the yarn 20 of the yarn supplying bobbin 2l
eventual-Iy runs out. When the yarn 20 of the yarn supplying
bobbin 21 runs out, the control section 25 stops the drive
of the roll-er drive motor 33 to stop the rotation of the
yarn accumulating rol-ler 32. Before or after this, the yarn
supplying section 7 discharges the empty yarn supplying
bobbin 27 (not il-lustrated) .
A magazine-type bobbin supplying device 26 is
arranged on a front side of the winding unit 2. The bobbin
supplying device 26 includes a rotary magazine can 2'l . The
magazine can 27 is configured to be able to hol_d a plurality
of spare yarn supplying bobbins 21. The bobbin supplying
device 26 intermittently rotatably drlves the magazine can
21 to supply a new yarn supplying bobbin 2l to the yarn
supplying section 7 (FIG. 5). When receiving a new yarn
supplying bobbin 2L supplied from the bobbin supplying
device 25, the yarn supplying section 7 sets the rel_evant
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yarn supplying bobbin 27 at an appropriate position.
The control section 25 then operates a lower yarn
blow-up device 11 arranged in proximity to the yarn
supplying bobbin 21. The l-ower yarn blow-up device 11 is
configured to bl-ow away the yarn (lower yarn 20a) from the
yarn supplying bobbin 21 towards the downstream by ejecting
compressed air towards the downstream (FIG. 6). The lower
yarn 20a bl-own away towards the downstream by the lower yarn
blow-up device 11 is sucked and caught by the yarn trap 15,
and introduced to the yarn joining device 14. A state which
is the same as FIG. 2 ts thereby obtained, and the control
section 25 performs the yarn joining operatj-on through the
same procedure as above.
According to the bobbin replacing operati-on
described above, the empty yarn supplying bobbin 21 can be
replaced with a new yarn supplying bobbin 21, and the
winding of the yarn 20 can be continued.
Also in the bobbin replacing operation described
above, a predetermined amount of yarn 20 is accumul-ated on
the yarn accumul-ating rol-Ier 32, and thus the winding
section 8 can continue the winding of the yarn 20
accumul-ated in the yarn accumufating section 18. The
controf secti-on 25 continues the drive of the drum drive
motor 19 even during the bobbin replacing operation, so that
the winding of the yarn 20 by the winding section 8 can be
continued.
Therefore, the yarn winding machine of the present
embodiment can continue the winding by the winding section
8 even during the bobbin replacing operation. The
production efficiency of the package 30 in the winding
section 8 thus can be enhanced. Furthermore, since the
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stopping of the rotation of the package 30 in the winding
section 8 is reduced, the damages on the yarn 20 can be
suppressed. The yarn quality is thus not affected.
As described above, even if the supply of yarn 20 from
the yarn supplying section 7 is interrupted, for examPfe,
during the yarn joining operation, the bobbin replacing
operation, and the l-ike, the yarn wi-nding machine of the
present embodiment can operate to continue the winding by
the winding section 8. To enable such an operation, it is
necessary to constantly maintain a state in which a
sufficient amount of yarn 20 is accumulated in the yarn
accumulating section 18, to prepare for when the supply of
the yarn 20 from the yarn supplying section 7 is
j-nterrupted.
The control- sectlon 25 of the present embodiment has
a function of an accumul-ated amount control- section 41. The
accumufated amount control section 4L performs an
accumulated amount control of maintaining the accumulated
amount of the yarn 20 on the yarn accumulating section 18
at around a predetermined upper limit amount.
The winding unit 2 incl-udes an upper l-imit sensor
(detecting section) 36 configured to detect that the
accumulated amount of the yarn 20 on the yarn accumul-ating
roller 32 has become greater than or equal to a
predetermined upper limit amount. The upper limit sensor
36 of the present embodiment is a reflection-type optical
sensor arranged in proximity to the yarn accumul-ating
roller 32, and is able to contactlessly detect the yarn 20
on the yarn accumulating rol-l-er 32. The upper limit sensor
36 of the present embodiment is configured to be turned ON
when the accumulated amount becomes greater than or equal
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to the upper limit amount, and to be turned OFF when the
accumul-ated amount is l-ess than the upper limit amount. The
detection resul-t of the upper Iimit sensor 36 1s output to
the control secti-on 25. The accumulated amount control
section 41 performs the accumulated amount control based
on the detection resuft of the upper limit sensor 36.
The accumulated amount control section 41 adjusts the
exit speed and/or the entrance speed to realize the
accumulated amount control. In other words, as is apparent
from FIG. l, the accumulated amount of the ,$t" 20 of the
yarn accumulating section 18 can be gradually reduced by
setting the exit speed faster than the entrance speed. On
the contrary, the accumul-ated amount of the yarn 20 of the
yarn accumufating section 1B can be gradually increased by
setting the entrance speed faster than the exit speed.
However, dS described above, in the winding unit 2
of the present embodiment, the roll-er drive motor 33
(entrance speed adjustment device) is controlled at a
constant speed so that the speed of unwinding the yarn from
the yarn supplying bobbin 2l t-s always a maximum. Therefore,
it is not appropriate to adjust the entrance speed for the
accumul-ated amount control- in the winding unit 2 of the
present embodiment. The accumul-ated amount control
section 47 of the present embodiment thus control-s the drum
drive motor 19 (exit speed adjustment device) to adjust the
exit speed and perform the accumul-ated amount control.
Next, the accumul-ated amount control- of the present
embodiment will- be described in detai-1 below.
The accumul-ated amount control performed by the
accumulated amount control- section 41 is illustrated in the
The accumulated amount control
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section 41 determines whether the upper limit sensor 36 is
turned ON or OFE in step 5101. To prevent chattering, in
step S101, such determination is made after confirming that
the output of the upper l-imit sensor 36 has not changed for
a predetermined time (e.9. , for two seconds).
If determined in step S101 that the upper l-imit sensor
36 is turned ON (if the accumulated amount is greater than
or equal to the upper l-imit amount), the accumufated amount
control section 4! control-s the drive speed of the drum
drive motor 19 so as to become a predetermined upper limit
drive speed (step 5102). On the other hand, if determined
in step 5101 that the upper limit sensor 36 is turned OEF
(if the accumulated amount is l-ess than the upper limit
amount) , the accumulated amount control section 41 control-s
the drive speed of the drum drive motor 19 so as to become
a predetermined lower limit drive speed (step 5103).
The control- sect ton 25 incl-udes an upper limit drive
speed storage unit 42 for storlng a set val-ue of the upper
limit drive speed, and a lower limit drive speed storage
unit 43 for storing a set value of the Iower limit dri-ve
speed. The accumulated amount control section 41 performs
the above processes based on the set val-ue of the upper limit
drive speed stored in the upper limit drive speed storage
un:-t 42, and the set val-ue of the l-ower limit drive speed
stored in the .l-ower limit dri-ve speed storage unit 43.
The upper limit drive speed is set such that the exit
speed when the drum drive motor 19 (exit speed adjustment
device) is driven at the upper limit drive speed becomes
faster than the entrance speed. Therefore, when the
accumul-ated amount control section 47 controls the drum
drive motor 19 at the upper Iimit drive speed (process of
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step 5702), the accumul-ated amount of the yarn 20 on the
yarn accumulating section 18 is gradually reduced. In this
regard, the process of step 5102 can be said as an amount
reducing process.
The lower Iimit drive speed is set such that the exit
speed when the drum drive motor 19 (exit speed adjustment
device) is driven at the l-ower l-imit drive speed becomes
slower than the entrance speed. Therefore, when the
accumufated amount control- section 4l controls the drum
drive motor 19 at the lower limit drive speed (process of
step 5103), the accumulated amount of the yarn 20 on the
yarn accumulating section 18 is gradually increased. In
this regard, the process of step S103 can be said as an amount
increasing process.
At the time of the normal winding, the accumul-ated
amount control section 41 is configured to repeatedly carry
out the processes from step S101 to step 5103. Since the
exit speed repeats speed-increase and speed-decrease
around the entrance speed, the accumulated amount repeats
increase and reduction around the upper limit amount.
Therefore, the accumul-ated amount can be maintained around
the upper limit amount by the accumul-ated amount control.
This state is ill-ustrated in EIG. 9.
Therefore, the accumul-ated amount control section 41
adjusts the drive speed of the drum drive motor 19 to switch
between the upper l-imit drive speed and the l-ower l-imit
drive speed according to ON/OFF of the upper limit sensor
36. The difference between the upper limit drive speed and
the l-ower l-imit drive speed is referred to as an adjustment
width of the drive speed of the drum drive motor 19. Thus,
the accumu1ated amount control- section 47 of the present
15
20
25
30
20/59
10
embodiment adjusts the exit speed by controlling the drive
speed of the drum drive motor 19 within a range of a
predetermined adjustment width.
The accumul-ated amount control- section 4l is
configured to interrupt the accumul-ated amount control-
(determination of step 5104) when the supply of the yarn
20 from the yarn supplying section 7 is interrupted (when
the rotation of the yarn accumulating rol-l-er 32 is stopped)
such as during the yarn joining operation and the bobbin
replacing operation. The control section 25 dri-ves the
drum drive motor 19 at a l-ow drive speed 1ower than the 1ower
limit drive speed while the accumulated amount control is
interrupted as described above (step 5106), so that the
windlng of the yarn 20 Lo the package 30 is continued. After
the yarn joining operation or the bobbin replacement is
finished, and the supply of the yarn 20 from the yarn
supplying section 7 is resumed (when the rotation of the
yarn accumufating roll-er 32 is resumed) , the accumul-ated
amount control- section 41 resumes the accumulated amount
control.
Irilhen the winding of the yarn 20 to the package 30 is
finished (when the package 30 is completed), the
accumulated amount contro.l- section 47 terminates the
accumufated amount control (determination of step S105).
When starting the winding of the yarn 20 around a new winding
bobbin 22 (empty winding bobbin 22) , Lhe accumulated amount
controL section 41 starts the accumulated amount control
again.
As already described in the prj-or art, slip may occur
between the winding drum 24 and the package 30. As the yarn
20 is wound into the package 30, the weight of the package
15
20
25
30
27/Sg
10
30 increases and the package 30 becomes difficult to rotate,
and the rotation speed of the package 30 changes.
Furthermore, in the case of the cone-shaped package 30, the
rotation speed of the package 30 fluctuates by the
fluctuation of a dri-ve point, which is the contacting point
of the package 30 and the winding drum 24. As described
above, the rotation speed of the package 30 may fluctuate
due to varj-ous factors. Thus, even if the control- section
25 adlusts the drive speed of the drum drive motor 19, it
is difficult to accurately control- the exit speed
(travell-ing speed of the yarn 20 to be wound into the package
30).
To rel-iabIy perform the accumulated amount control,
a large (fast) value is set, with a margin, to an initial
set value of the upper limit drive speed stored in the upper
limit drive speed storage unit 42. A smal1 (slow) value
is set, with a margJ-n, to an initial set va1ue of the lower
limit drive speed stored in the l-ower limit drive speed
storage unit 43. Therefore, in the state of the initial
set val-ue, the adjustment width (difference between the
upper limit drive speed and the l-ower limit drive speed)
of the drive speed of the drum drive motor 19 is wide. The
"initial- set value" referred to herein is a value set when
starting to wind the yarn 20 with respect to a new winding
bobbin 22 (empty winding bobbin 22).
A characteristic configuration of the present
embodiment will- be described bel-ow.
As described above, when starting to wind the yarn
20 around the new winding bobbin 22 (empty winding bobbin
22), the adjustment width of the drive speed of the drum
drive motor 19 is wide. However, j-f the accumul-ated amount
15
20
25
30
22/Sg
10
control- is continued with the adjustment width remained
wide, the drive speed of the drum dri-ve motor 19 greatly
fluctuates. As a result, the travelling speed (exit speed)
of the yarn 20 wound into the package 30 greatly fluctuates,
and may adversely affect (surface disturbance or the like)
the formation of the package 30.
The control section 25 of the present embodiment thus
has a function of an adjustment width control section 45.
The adjustment width control- section 45 is configured to
carry out an adjustment width reduction control of
gradually reducing the adjustment width J-n parallel with
the accumulated amount control- by the accumul-ated amount
control- section 47. The f 1uctuat j-on in the travelling
speed (exit speed) of the yarn 20 wound into the package
30 can be suppressed and the adverse effect on the formation
of the package 30 can be prevented by reducing the
adjustment width.
The adjustment width is set wide in the first place
to reliably carry out the accumulated amount control- by the
accumulated amount contro1 section 41. If the adjustment
width control section 45 appropriately reduces the
adjustment width, the accumufated amount control by the
accumulated amount control section 47 may not be
appropriately carried out. Therefore, in the adjustment
width reduction controL of the present embodiment, the
adjustment width control- section 45 is configured to
gradually reduce the adjustment width based on the
detection result of the upper Iimit sensor 36. Thus, the
adjustment width reduction control- can be appropriately
carried out by feeding back the information assocj-ated with
the accumulated amount.
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20
25
30
23/59
10
Next, the adjustment width reductj-on control by the
adjustment width control section 45 of the present
embodiment wil-I be described with reference to the
fl-owchart of EIG. 10.
As illustrated in FIG. 7, the control- sect:-on 25 of
the present embodiment includes a timer 46.
The timer 46 is confi-gured to measure the length of
the period in which the output of the upper limit sensor
36 is turned ON (period in which the accumul-ated amount is
greater than or equal to the upper l-imit amount) and the
length of the period in which the output of the upper l-imit
sensor 36 is turned OFF (period in which the accumulated
amount is less than the upper l-imit amount). The period
in which the output of the upper limit sensor 36 is turned
ON is the period in which the amount reducing process by
the accumul-ated amount control section 41 (step 5102 of FIG.
8) is carried out, and thus is referred to as an amount
reduci-ng process period. The period in which the output
of the upper limit sensor 36 is turned OFF is the period
in which the amount increasing process by the accumul-ated
amount control- section 41 (step 5103 of FIG. 8) is carried
out, and thus is referred to as an amount i-ncreasing process
period.
The adjustment width control section 45 determines
whether or not the length of the period (amount reducing
process period) in which the upper limit sensor 36 is turned
ON is greater than or equal to the length of the period in
which the upper l-imit sensor 36 is turned OFF (amount
increasing process period) (step S201).
For exampler ds il-lustrated in FIG. 11A, when the
length of the amount reducj-ng process period (period in
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20
25
30
24/59
10
which the upper limit sensor 36 is turned ON) is longer than
the length of the amount increasing process period (period
in which the upper limit sensor 36 is turned OFF) , this means
that the time in which the accumulated amount controlsectj-
on 41 carried out the amount reducing process 1s longer
than the time in which the accumul-ated amount control
section 41 carried out the amount increasing process, and
thus the accumulated amount control is not balanced.
Therefore, when the length of the amount reducing process
period is greater than or equal to the length of the amount
j-ncreasing process period, the adjustment width contro1
section 45 sets the set val-ue of the lower l-imit drive speed
stored in the lower limit drive speed storage unlt 43 large
(fast) (step 5202).
By setting the set val-ue of the lower l-imit drive speed
large as described above, the adjustment width (difference
between the upper limit drive speed and the l-ower limit
drive speed) of the drive speed of the drum drive motor 19
is reduced. Therefore, the fl-uctuation in the travelling
speed (exit speed) of the yarn 20 wound into the package
30 can be reduced.
Eurther, by setting the set val-ue of the l-ower limit
drive speed large (fast), the exit speed becomes faster in
the amount increasing process (step 5103) carried out by
the accumul-ated amount control section 47. Thus, the
difference between the entrance speed and the exit speed
becomes smal-I in the amount increasing process, and the
accumulated amount is less 1ikeIy to increase. As a result,
the amount increasing process takes time (amount increasing
process period becomes long) , and hence the balance between
the amount reducing process period and the amount
15
20
25
30
25/s9
10
increasing process period is corrected (FIG. 118).
When the set value of the lower limit drive speed is
set too large (fast) , the exit speed may exceed the entrance
speed in the amount increasing process. Therefore, in step
5202, the adjustment width control section 45 of the present
embodj-ment is configured to set the set val-ue of the lower
l-imit drive speed large (fast) by a predetermined amount
defined in advance. Therefore, in the process of step 5202,
as illustrated in FfG. 118, the adjustment width
(difference in the upper l-imit drive speed and the lower
limit drive speed) of the drive speed of the drum drive motor
19 becomes smal-l- by a predetermined amount.
Eor example, ds il-l-ustrated in FIG. L2A, when the
length of the amount reducing process period (period in
which the upper l-imit sensor 36 is turned ON) is shorter
than the length of the amount increasing process period
(period in which the upper l-imit sensor 36 is turned OFE),
this means that the time of the amount reducing process
(step S102) carried out by the accumul-ated amount control_
section 41 is shorter than the amount increasing process
(step 5103), and the accumul-ated amount contro1 is not
bal-anced. When the length of the amount reducing process
period is l-ess than the length of the amount increasing
process period, the adjustment width control section 45
sets the set val-ue of the upper l-imit drive speed stored
in the upper limit drive speed storage unit 42 smal1 (s1ow)
(step 5203).
By setting the set value of the upper limit drive speed
sma1l as described above, the adjustment width (difference
between the upper l-imit drive speed and the lower limit
drive speed) of the drive speed of the drum drive motor 19
15
20
25
30
26/59
10
is reduced. Therefore, the fluctuation in the travelling
speed (exit speed) of the yarn 20 wound into the package
30 can be reduced.
Furthermore, by setting the set val-ue of the upper
limit drj-ve speed small (s1ow) , the exit speed becomes slow
in the amount reducing process (step S102) carried out by
the accumulated amount control secti-on 41. The difference
between the entrance speed and the exit speed thus becomes
sma11 in the amount reducing process, and the accumul_ated
amount is l-ess likeIy to reduce. As a result, the amount
reducing process takes time (amount reducing process period
becomes long), and hence the balance between the amount
reducing process period and the amount increasing process
period is corrected (FIG. 728) .
When the set value of the upper limit drive speed is
set too small (sl-ow) , the exit speed may become l_ower than
the entrance speed in the amount reducing process.
Therefore, in step 5203, the adjustment width control
section 45 of the present embodiment is configured to set
the set val-ue of the upper limit drive speed small- (sl_ow)
by a predetermined amount defined in advance. Therefore,
in the process of step 5203, the adjustment width
(difference between the upper limit drive speed and the
lower limit drj-ve speed) of the drive speed of the drum drive
motor 79 is reduced by a predetermined amountr ds
il-l-ustrated in FIG. 728.
The adjustment width control- section 45 is configured
to repeat the processes of step 5201 to 5203 at the time
of the norma1 winding. According to such repeating
processes, the adjustment width of the drj-ve speed of the
drum drive motor 19 can be gradually reduced by a
15
20
25
30
21/59
10
predetermined amount. The state in which the adjustment
width is gradually reduced by the adjustment width
reduction control- is illustrated in the lower graph of FIG.
13.
In the lower graph of FIG. !3, the portion where the
set value of the lower fimit drive speed changes step-wise
indicates that the process of step 5202 is executed. The
portion where the set val-ue of the upper limit drive speed
changes step-wise in the lower graph of FIG. 13 indicates
that the process of step 5203 is executed.
As described above, the accumul-ated amount control
by the accumul-ated amount contro1 section 41 is carried out
in parallel- with the adjustment width reduction control.
The change in the exit speed by the accumulated amount
control is ill-ustrated 1n the upper graph of FIG. 13. Since
the adjustment width of the drive speed of the drum drive
motor 19 is gradually reduced by the adjustment width
reduction control, the fluctuation in the exit speed by the
accumul-ated amount control is also gradually reduced as
illustrated in the upper graph of FIG. 13.
As described above, by carrying out the adjustment
width reduction control- of reducing the adjustment width
of the drive speed of the drum drive motor 19 based on the
detection resul-t of the upper limit sensor 36, the yarn
winding machj-ne of the present embodj-ment can reduce the
fluctuation in the exit speed (travel-l-ing speed of the yarn
20 wound into the package 30) by the accumul-ated amount
control. The winding of the yarn into the package 30 thus
can be stabilized, and the package 30 of stable quality can
be produced.
When the adjustment width becomes too smalI by the
15
20
25
30
28/Sg
10
adjustment width reduction control, there is hardly a
difference between the upper limit drive speed and the rower
limit drive speed, and hence the accumul_ated amount is
hardly increased or reduced even if the accumul_ated amount
control is carried out. Thus, the upper limit sensor
frequently repeats ON/OEF (chattering), raising a
different problem in that the accumul-ated amount control
becomes unstabl-e. From the standpoint of stabilizing the
accumulat.ed amount control, it is preferred that there is
a certaj-n degree of dif ference between the upper l_imit drive
speed and the lower limit drive speed.
The adjustment width control secti-on 45 of the
present embodiment is configured so that the adjustment
width does not become small-er than a predetermined target
value. Specifical-1y, the adjustment width control_ section
45 is configured to terminate the adjustment width
reduction control- and shift to an adjustment width
maintaining contro1 when the adjustment width is reduced
to less than or equal to the predetermined target val-ue
(determination of step 5204) .
Next, the adjustment width maintaining control
carrj-ed out by the adjustment width contro1 section 45 of
the present embodiment wilr be described with reference to
the f ]owchart of FIG. 74 .
Al-so in the adjustment width maintaining control, the
adjustment width control- section 45 is configured to
determine whether or not the length of the period (amount
reducing process period) in which the upper limit sensor
36 is turned ON is greater than or equal to the length of
the period (amount increasing process period) in which the
upper limit sensor 36 is turned OFF (step 5301).
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20
25
30
29/59
10
When the length of the amount reducing process period
is greater than or equal to the amount increasing process
period, the adjustment width control- section 45 increases
the set value of the l-ower limit drive speed stored in the
lower limit drive speed storage unit 43 by a predetermined
amount (step S302). The adjustment width controf sectj-on
45 is configured to increase the set val-ue of the upper limit
drive speed stored in the upper limit drive speed storage
unit 42 by an amount in which the set value of the lower
Iimit drive speed is increased in step 5302 (step 5304).
Thus, ds i1lustrated in EIG. 158, the upper limit drive
speed and the lower limit drive speed can be shifted upward
while maintaining the adjustment width.
When the length of the amount increasing process
period is greater than or equal to the amount reducing
process period, the adjustment width control section 45 is
configured to reduce the set value of the upper limit drive
speed stored in the upper limit drive speed storage unit
42 by a predetermined amount (step S303). The adjustment
width control section 45 is configured to reduce the set
va1ue of the lower limit drive speed stored in the fower
l-imit drive speed storage unit 43 by an amount in which the
set value of the upper l-imit drive speed is reduced in step
S303 (step S305). Thus, although not iLlustrated, the
upper limit drive speed and the l-ower limit drive speed can
be shifted downward whil-e maintaining the adjustment width.
Thus, in the adjustment width maintaining control,
when the set val-ue of any one of the upper l-imit drive speed
and the l-ower l-imit drive speed is changed, the adjustment
width control section 45 al-so changes the other set value
in the same direction by the same amount. Accordingly, the
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20
25
30
30/59
10
adjustment width (difference between the upper l-imit drive
speed and the l-ower limit drive speed) can be maintained,
the adj ustment width does not become smal-l-er than the target
value, and hence the accumuLated amount control can be
stabilized. Thus, the accumul-ated amount control- can be
stabilized with the exit speed j-ncreasing and decreasJ-ng
around the entrance speed (e.9., state of FIG. 15B).
The adjustment width control section 45 is configured
to repeatedly carry out the processes from steps S301 to
5305 until the winding of the yarn 20 into the package 30
is finished (until the package 30 is completed)
(determination of step S306).
Since the adjustment width reduction contro1 and the
adjustment width maintaining control are carried out in
paral1el with the accumul-ated amount control-, the
adjustment width reduction control- (or the adjustment width
maintaining control) is al-so stopped or interrupted when
the accumulated amount control- is stopped or interrupted.
As described above for example, the accumulated amount
control- section 47 interrupts the accumul-ated amount
control during the yarn joining operation and the bobbin
replacing operation (determination of step 5104 in EIG. 8).
Therefore, the adjustment width control- section 45 also
interrupts the adjustment width reduction control (or the
adjustment width maintaining control) during the yarn
joining operation and the bobbin replacing operation.
When the accumulated amount control- section 41 resumes the
accumulated amount control, the adjustment width controlsection
45 al-so resumes the adjustment width reduction
control (or the adjustment width malntaining control-).
When the winding of the yarn into the package 30 is
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20
25
30
31/59
10
15
20
25
finished (when the package 30 is completed), the adjustment
width control section 45 terminates the adjustment width
reduction control (or the adjustment width maintaining
control). The adjustment width control section 45 is
configured to then reset the set value of the upper limit
drive speed stored in the upper limit drive speed storage
unit 42 and the set value of the lower limit drive speed
stored in the 1ower limit drive speed storage unit 43
respectively to the initial set values (step 5307).
Therefore, when starting the winding of the new package 30,
the accumulated amount control and the adjustment width
reduction contro1 are started with the upper limit drive
speed and the J-ower l-imit drive speed in the state of the
initial set value (state of wide adjustment width) .
As described above, the yarn winding machine of the
present embodiment incl-udes the yarn supplying section 7,
the yarn accumul-ating section 18, the winding section B,
the upper limit sensor 36, the roller drive motor 33, the
drum drive motor 19, and the control section 25. The yarn
supplying section 7 supplies the yarn 20. The yarn
accumulating sectj-on 18 accumulates the yarn 20 supplied
from the yarn supplying section 7. The winding section 8
winds the yarn 20 accumulated in the yarn accumul-ating
section 18 to form the package 30. The upper limit sensor
36 detects whether or not the accumulated amount of the yarn
20 tn the yarn accumulating section 1B is greater than or
equal to a predetermj-ned upper limit amount. The roller
drive motor 33 adjusts the speed of the yarn 20 entering
the yarn accumul-ating section 18. The drum drive motor 19
adjusts the speed of the yarn 20 exiting from the yarn
accumulating section 18. The contro1 sect:-on 25 performs
30
32/59
10
the accumul-ated amount control- of adjusting the accumulated
amount by carrying out the adjustment of the speed of the
yarn 20 by the drum drive motor 19 within the range of the
predetermined adjustment width. The control section 25
then carries out the adjustment width reduction control of
reducing the adjustment width to the target value based on
the lnformation detected by the upper limit sensor 35 in
para1le1 with the accumul-ated amount control.
Thus, the adjustment width of the speed of the yarn
20 by the drum drive motor 19 can be reduced by feeding back
the i-nformation detected by the upper l-imit sensor 36. The
fl-uctuation in the travelling speed of the yarn 20 thus
becomes smalI, and the stabl-e package winding and yarn
accumul-ation can be realized, whereby the yarn layer
dj-sturbance in the surface layer of the package can be
prevented, and the accumul-ated amount of the yarn can be
maintained constant.
Furthermore, as described above, the contro1 section
25 of the present embodiment realizes the accumulated
amount control by carrying out the adjustment of the speed
of the yarn 20 by the drum drive motor 19 within the range
of tl" predetermined adjustment width. The control
section 25 real-izes the adjustment width reduction controlby
decreasj-ng the upper limit drive speed, which is the
upper l-imit of the adjustment width, and increasing the
lower limit drive speed, which is the l-ower l1mit of the
adjustment width.
The adjustment width of the speed of the yarn 20 by
the drum drive motor t9 thus can be reduced.
As described above, the upper limit sensor 36 of the
present embodiment is configured to detect whether the
15
20
25
30
33/s9
10
accumulated amount is greater than or equal to, or less than
the upper limit amount. The yarn winding machine of the
present embodiment include the timer 46 for measuring the
length of the amount reducing process period, which is the
period in which the accumulated amount is greater than or
equal to the upper limit amount, and the length of the amount
increasing process period, which is the period in which the
accumul-ated amount is less than the upper l-imit amount. The
control section 25 control-s the drum drive motor 19 at the
upper limit drive speed when the accumulated amount is
greater than or equal to the upper limit amount, and
control-s the drum drive motor 19 at the l-ower limit drive
speed when the accumulated amount is l-ess than the upper
limit amount, to realize the accumulated amount control.
The control- sect:-on25 increases the lower limit drive speed
when the length of the amount reducing process period is
greater than or equal to the length of the amount increasing
process period, and decreases the upper limit drive speed
when the length of the amount reducing process period is
l-ess than the length of the amount increasing process period,
to realize the adjustment width reduction control.
The adjustment width thus can be reduced whil-e taking
the bal-ance between the amount reducing process period and
the amount increasing process period.
As described above, after the adjustment width of the
drum drive motor 19 becomes l-ess than or equal to the target
value, the control section 25 shifts from the adjustment
width reduction control to the adjustment width maintaining
control-. In the adjustment width maintaining control, the
control- section 25 increases the l-ower limit drive speed
and the upper l-imit drive speed whil-e maintaining the
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20
25
30
34/59
10
adjustment width when the length of the amount reducing
process period J-s greater than or equal to the length of
the amount j-ncreasing process period. Furthermore, in the
adjustment width maintaining control, the control section
25 decreases the lower l-imit drive speed and the upper limit
drive speed while maintaining the adjustment width when the
length of the amount reducing process period is l-ess than
the length of the amount increasing process period.
Thus, the amount reducing process period and the
amount increasing process period can be bal-anced while
maintaining the adjustment width at the target va}ue.
As described above, the upper limit sensor 35 of the
present embodiment is an optical sensor member for
detecting the presence or absence of the yarn 20 accumulated
in the yarn accumul-ating section 18.
The optical sensor can contactlessly detect the
presence or absence of the yarn 20, and thus can obtain an
accurate detection resuLt without affecting the winding of
the yarn 20. Furthermore, since the optical sensor is a
contactl-ess type, it does not adversely affect the quality
of the yarn 20.
As described above, the yarn winding machine of the
present embodiment includes the yarn joining device 14 for
connecting the disconnected yarn 20 when the yarn 20 between
the yarn supplying section 7 and the yarn accumul-ating
section 18 j-s disconnected. During the execution of the
yarn joining operation by the yarn joining device 14, the
contro1 section 25 stops the accumulated amount control- and
the adjustment width reduction control, and continues the
winding of the yarn 20 by the winding section B.
In other words, during the execution of the yarn
15
20
25
30
35/s9
10
joining operation, the supply of the yarn 20 from the yarn
supplying section 7 is interrupted, and hence the
accumul-ated amount controf and the like are stopped. In
this case, however, the winding section 8 can continue the
winding of the yarn 20 accumulated in the yarn accumulating
section 18. Since the stopping of the rotatj-on of the
package 30 in the winding section I is reduced, the damages
on the yarn can be suppressed. The yarn quality is thus
not affected.
As described above, the yarn supplying sectj-on 7 of
the present embodiment has a configuration of holding the
yarn supplying bobbin 27 wound with the spun yarn, and
supplying the spun yarn unwound from the yarn supplying
bobbin 21.
When the replacement of the yarn supplying bobbin 21
is carried out in the yarn supplying section 7, the supply
of the yarn 20 is interrupted, but in this case as we1I,
the winding section 8 can continue the winding of the yarn
20 accumul-ated in the yarn accumul-ating section 18.
Furthermore, since the stopping of the rotation of the
package 30 in the winding section 8 j-s reduced, the damages
on the ya.rn can be suppressed. The yarn quality is thus
not affected.
Next, dD al-ternatj-ve embodiment of the embodiment
described above wil-1 be described.
In the embodiment described above, the accumulated
amount control section 41 has a configuration of carrying
out the accumul-ated amount control, the adjustment width
reduction control, and the adjustment width maintaining
control- by controlling the exit speed adjustment device
(drum drive motor 19) and adjusting the exit speed. However,
15
20
25
30
36/s9
10
the present invention is not limited thereto, and the
accumul-ated amount control- section 41 may carry out the
accumulated amount control, the adjustment width reduction
control-, and the adjustment width maintaining control by
controll-ing the entrance speed adjustment device (roller
drive motor 33) and adjusting the entrance speed.
Thus, even when the entrance speed adjustment devj-ce
(ro1Ier drive motor 33) is controlled, the control can be
carried out with the same idea as the embodiment described
above.
However, there is a difference that the exit speed
is adjusted or the entrance speed is adjusted, and thus
details need to be changed from the control- of the
embodiment described above. Hereinafter, a case of
real-izlng the accumulated amount control, the adjustment
width reduction control-, and the adjustment width
maintaining control by controlling the roll-er drive motor
33 and adjusting the entrance speed wil-l- be briefly
described.
That is, in this alternative embodiment, the upper
l-imit (upper Iimit drive speed) of the adjustment width of
the drive speed of the roll-er drive motor 33 is set in the
upper limit drive speed storage unit 42, and the lower l-imit
(l-ower limit drive speed) of the adjustment width of the
drive speed of the roll-er drive motor 33 is set in the l-ower
limit drive speed storage unit 43. The accumulated amount
control section 4L of the al-ternative embodiment can
real-j-ze the accumul-ated amount control by switching the
drive speed of the rol-l-er drive motor 33 between the upper
limit drive speed and the lower limit drive speed. The
control section 25 can real-ize the adj ustment width
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20
25
30
31/59
10
reduction control by decreasi-ng the upper limit drive speed
or increasing the lower limit drive speed of the roller
dri-ve motor 33.
Thus, even when the accumul-ated amount control is
carried out by adjusting the drive speed of the rol-ler drive
motor 33, the adjustment width reduction control- can be
carried out similarly to the embodiment described above.
The accumul-ated amount control- section 4L of the
al-ternative embodiment adjusts the drive speed of the
rol-l-er drive motor 33 to the l-ower l-imit drive speed when
the accumul-ated amount is greater than or equal to the upper
limit amount. The entrance speed thus becomes sl-ower than
the exit speed, and the accumul-ated amount is gradually
reduced (amount reducing process) . The accumul-ated amount
control section 47 of the alternative embodiment adjusts
the drive speed of the roller drive motor 33 to the upper
l-imit drj-ve speed when the accumul-ated amount is less than
the upper l-imit amount. The entrance speed thus becomes
faster than the exit speed, and the accumulated amount is
gradually increased (amount increasing process) .
The adjustment width control- section 45 of the
alternative.embodiment decreases (sets slow) the upper
limit drive speed of the drive speed of the rol-Ier drive
motor 33 when the length of the amount reducing process
period is greater than or equal to the length of the amount
increasing process period. Thus, the adjustment width
(difference between the upper limit drive speed and the
lower limit drive speed) of the drive speed of the rol-l-er
drive motor 33 is reduced by decreasing the upper l-imit
drive speed. Therefore, the fl-uctuation in the travelling
speed (exit speed) of the yarn 20 wound around the yarn
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accumulating roller 32 can be reduced.
Further, since the entrance speed becomes sl-ow in the
amount increasing process by decreasing the upper limit
drive speed of the rol-ler drive motor 33, the difference
between the entrance speed and the exit speed becomes smal-I
in the amount increasing process, and the accumul-ated
amount is less likely to increase. As a result, the amount
increasing process takes time (amount increasing process
period becomes long), and hence the bal-ance between the
amount reducing process period and the amount increasing
process period can be corrected.
The adjustment width control- section 45 of the
alternative embodiment increases (sets fast) the l-ower
limit drive speed of the drive speed of the rol1er drive
motor 33 when the length of the amount reducing process
period is l-ess than the length of the amount increasing
process period. By increasing the l-ower limit drive speed,
the adjustment width (difference between the upper limit
drj-ve speed and the lower l-imit drj-ve speed) of the drive
speed of the roll-er drive motor 33 is reduced. Therefore,
the fl-uctuation in the travel1ing speed (exit speed) of the
yarn 20 wound. around the yarn accumulating rol-l-er 32 can
be decreased.
Further, since the entrance speed becomes faster in
the amount reducJ-ng process by increasj-ng the lower l-imit
drive speed of the roller drj-ve motor 33, the difference
between the entrance speed and the exit speed becomes smal-l
in the amount reducing process, and the accumulated amount
is Iess 1ike1y to reduce. As a result, the amount reducing
process takes time (amount reducing process period becomes
long), and hence the bal-ance between the amount reducing
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process period and the amount increasing process perj-od can
be corrected.
Thus, even when the drive speed of the rol_l_er drive
motor 33 is adjusted and controlled, the adjustment width
reduction control can be realized whife taking the barance
between the amount reducing process period and the amount
increasing process period.
Also in this alternative embodiment, after the
adjustment width becomes the target value, the adjustment
width control- section 45 shifts from the adjustment width
reduction control to the following adjustment width
maintaining control-. That is, in the adjustment width
maj-ntaining control of the al-ternative embodiment, the
adjustment width control section 45 decreases (sets slow)
the lower limit drive speed and the upper 1imit drive speed
of the drive speed of the rol-l_er drive motor 33 while
maintaining the adjustment width when the length of the
amount reducing process period is greater than or equal to
the length of the amount j-ncreasing process period. In the
adjustment width maintaining control- of the alternative
embodiment, the adjustment width control_ section 45
increases (sets fast) the lower l_imit drive speed and the
upper limit drive speed of the drive speed of the rol_l_er
drive motor 33 while maintaining the adjustment width when
the length of the amount increasing process period is 1ess
than the length of the amount reducj-ng process period.
' Thus, even when the drive speed of the roller drive
motor 33 is adjusted, the amount reducing process period
and the amount j-ncreasj-ng process period can be bal_anced
whil-e maintaining the adjustment width at the target value.
The suitable embodiments and the alternative
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embodiments of the present invention have been described
above, but the above-described configuration can be
modified as bel-ow.
In the embodiment described above, the detecting
section is assumed as a light refl-ection-type upper Iimit
sensor, but the present invention j-s not limited thereto.
The detecting section merely needs to be able to acquire
the information associated with the accumul-ated amount by
some kind of method. The acquired information associated
with the accumulated amount is fed back to the control
section 25, so that the accumul-ated amount control-, the
adjustment width reduction control-, and the adjustment
width maintaining control- can be realj-zed in the control
section 25.
Any one of the drive speed of the drum drive motor
79 (exit speed adjustment device) and the drive speed of
the rol-Ier drive motor 33 (entrance speed adjustment
device) does not necessarily need to be maintained constant,
and the accumul-ated amount control may be realized by
simul-taneously adjusting both drive speeds.
The yarn accumulating section is not Iimited to the
configuratlon of. winding and accumulating the yarn on the
outer circumference of the yarn accumufating rofler 32 as
in the embodiment described above. As the device for
accumul-ating the yarn, a configuration other than the yarn
accumulating rol-l-er 32 such as a slack tube and a
compensator is also known. Such known configurations may
be adopted for the yarn accumulating section of the present
invention. However, as long as a configuration of winding
the yarn 20 around the circumference of the yarn
accumulating rol-ler 32 as in the present embodiment is
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adopted, the accumulation of a l-arge amount of yarn can be
real-ized with a compact configuration, and furthermore, the
yarn entanglement is less IikeIy to occur.
The winding section 8 of the embodiment described
above performs traversing by the traverse groove formed on
the outer circumference of the winding drum 24, but may
perform traversing by an arm-type traverse device, for
example.
The present invention is not l-imited to the automatic
winder, and is also applicable to a yarn winding device
having another configuration including the yarn
accumulating section. For exampl-e, JP 2004-211949 A
discloses a fine spinning machine including a yarn
accumulating section (yarn sl-ack removj-ng device) between
the yarn supplying section and the winding section. The
configuration of the present invention can be applied to
the accumulated amount contro1 of the yarn accumul-ating
section in the fine spinning machine. The fine spinning
machine of JP 2004-211949 A includes a draft device
configured to draft a fiber bundle, and a spinning device
configured to spin the fiber bundl-e drafted by the draft
device. The spun yarn spun by the spinning machine is
supplied downstream. Therefore, in this type of fine
spinning machine, the draft device and the spJ-nning device
can be assumed as the "yarn supplying section".
Thus, the configuration of the present invention can
also be applied to the spinning machine configured to wind
the spun yarn spun by the spinning device. Since the yarn
accumulating section is arranged between the spinning
device and the winding section, the speed fluctuation of
the winding secti-on can be absorbed in the yarn accumufating
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section. The speed fluctuation t.hus can be prevented from
affectj-ng the spinning speed, and the spun yarn can be spun
at a stabl-e spinning speed.
According to the configuration of the present
invention, the following yarn winding method can be
real-i zed.
There is provided a yarn winding method for
accumul-ating a yarn pulled out from a yarn supplying section
in a yarn accumulating section and pulling out the yarn
accumul-ated in the yarn accumulating section to form a
package, wherein adjustment of an entrance speed, which is
a speed of the yarn enterj-ng the yarn accumul-ating section,
and adjustment of an exit speed, which is a speed of the
yarn exiting from the yarn accumul-ating section, are
carried out within a range of a predetermined adjustment
width to carry out the accumul-ated amount control, and
information associ-ated with an accumulated amount of the
yarn is detected to carry out the adjustment width reduction
control of reducing the adjustment width to a target va1ue.
The adjustment of the exit speed is carried out within
the range of the predetermined adjustment width to realize
the accumulated amount control, and the upper limit of the
adjustment width is lowered or the l-ower limit of the
adjustment width is raised to reaLize the adjustment width
reduction control.
The yarn winding method further includes: detecting
whether the accumul-ated amount is greater than or equal to,
or l-ess than a target amount,' measuring a length of an amount
reducing process period, which is a period in which the
accumul-ated amount is greater than or equal to the target
amount, and a length of an amount increasing process period,
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which is a period in which the accumul-ated amount is fess
than the target amount; real-izing the accumulated amount
control- by controlling the adjustment of the exit speed at
the upper limit of the adjustment width when the accumul-ated
amount is greater than or equal to the target amount and
control-ling the adjustment of the exit speed at the l-ower
limit of the adjustment width when the accumul-ated amount
is l-ess than the target amount; and realiztng the adjustment
width reduction control by raising the l-ower l-imit of the
adjustment width when the length of the amount reducing
process period is greater than or equal to the length of
the amount i-ncreasing process period, and lowering the
upper l-imit of the adjustment width when the length of the
amount reducing process period is less than the length of
the amount increasing process period.
The yarn winding method further incl-udes shifting
from the adjustment width reduction control to an
adjustment width maintaining control after the adjustment
width in the adjustment of the exit speed becomes the target
val-ue; wherein in the adjustment width maintaining control,
the upper limit and the lower limit of the adjustment width
are raised whil-e maintaj-ning the adjustment width when the
length of the amount reducing process period is greater than
or equal to the length of the amount increasing process
period, and the upper limit and the lower limit of the
adjustment width are i.owered while maintaining the
adjustment width when the length of the amount reducing
process period is l-ess than the length of the amount
increasing process period.
The package wound by such yarn winding methods is
produced in a state in which the speed fluctuation j-s sma1l,
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and hence a unj-form winding state can be obtained.
The adjustment width of the speed of the yarn by the
entrance speed adjustment device and/or the exit speed
adjustment device thus can be reduced by feeding back the
information detected by the detecting section. The
fluctuation in the travelling speed of the yarn thus becomes
smal-l-, and a stable package winding and yarn accumulatlon
can be real-ized. Accordingly, yarn layer disturbance of
the surface layer of the package can be prevented and the
accumul-ated amount of the yarn can be maintained constant.
The yarn winding machine described above preferably
has the following configuration. In other words, the
control section real-izes the accumufated amount control by
carrying out the adjustment of the speed of the yarn by the
exit speed adjustment device within the range of the
predetermined adjustment width. The control- section
realizes the adjustment width reduction control by lowering
an upper limit of the adjustment width or raising a 1ower
l-imit of the adjustment width.
The adjustment width of the speed of the yarn by the
exit speed adjustment device thus can be reduced.
The yarn winding machine described above preferably
has the following configuration. In other words, the
detecting section is configured to detect whether the
accumulated amount is greater than or equal to, or less than
a target amount. The yarn winding machine further includes
a timer configured to measure a length of an amount reducing
process period, which is a period in which the accumulated
amount is greater than or equal to the target amount, and
a length of an amount increasing process period, which is
a period in which the accumulated amount is l-ess than the
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target amount. The control section real-izes the
accumulated amount control by controlling the exit speed
adjustment device at the upper limit of the adjustment width
when the accumulated amount is greater than or equal to the
target amount, and controlling the exit speed adjustment
device at the l-ower limit of the adjustment width when the
accumul-ated amount is l-ess than the target amount. The
control- section real,izes the adjustment width reduction
control by raising the l-ower limit of the adjustment width
when the length of the amount reducing process period is
greater than or equal to the length of the amount increasing
process period, and lowering the upper limit of the
adjustment width when the length of the amount reducing
process period is less than the length of the amount
increasing process period.
Thus, the adjustment width can be reduced while
taking the balance between the amount reducing process
period and the amount increasing process period.
In the above yarn winding machine, the controlsection
is preferably configured to shift from the
adjustment width reduction control- to the following
adjustment width maintaining control- after the adjustment
width of the exit speed adjustment device becomes less than
or equal to the target value. In other words, in the
adjustment width maintaining control, the control section
raises the upper limit and the lower limit of the adjustment
width while maintaining the adjustment width when the
length of the amount reducing process period is greater than
or equal to the length of the amount increasing process
period. Furthermore, in the adjustment width maintaining
control-, the control- section lowers the upper l-imit and the
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lower limit of the adjustment width whil-e maintaining the
adjustment width when the length of the amount reducing
process peri-od is l-ess than the length of the amount
increasing process period.
Thus, the amount reducing process period and the
amount increasing process period can be bal-anced while
maintaining the adjustment width at the target value.
The yarn winding machine described above may also
have the following configuration. In other words, the
control section real-i-zes the accumul-ated amount control by
carrylng out the adjustment of the speed of the yarn by the
entrance speed adjustment device within the range of the
predetermined adjustment width. The control- section
realizes the adjustment width reduction control by lowering
the upper l1mit of the adjustment width or raising the lower
limit of the adjustment width.
Thus, the accumul-ated amount control can be carried
out by controlling the entrance speed adjustment device.
In this case, the control section realizes the
accumulated amount control- by controlling the entrance
speed adjustment device at the lower limit of the adjustment
width when the accumul-ated amount is greater than or equal
to the target amount, and control-Iing the entrance speed
adjustment device at the upper limit of the adjustment width
when the accumul-ated amount is less than the target amount.
In this case, the control section real-izes the adjustment
width reduction control by lowering the upper l-imit of the
adjustment width when the length of the amount reducing
process period is greater than or equal to the amount
increasing process period, and raises the l-ower limit of
the adjustment width when the length of the amount reducing
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process period is l-ess than the length of the amount
increasing process period.
Thus, even when the accumul_ated amount control is
carried out by controll-ing the entrance speed adjustment
device, the adjustment width can be reduced whil_e taking
the balance between the amount reducing process period and
the amount increasing process period.
In this case, the adjustment width maintaining
control j-s carried out in the fol_lowing manner. In other
words, in the adjustment width maintaJ-ning control_, the
control- sectj-on l-owers the upper timit and the l-ower limit
of the adjustment width while maintaining the adjustment
width when the length of the amount increasing process
period is greater than or equal to the length of the amount
reducing process period. Furthermore, in the adjustment
width maintaini-ng control, the control- section raises the
upper limit and the l-ower limit of the adjustment width
while maintaini-ng the adjustment width when the length of
the amount reducing process period is l_ess than the length
of the amount increasing process period.
Thus, even when the accumul_ated amount control_ is
carried out by control-l-ing the entrance speed adjustment
device, the amount reducing process period and the amount
increasing process period can be balanced whil_e maintaining
the adjustment width at the target value.
In the above yarn winding machine, the detecting
section is preferably an optical sensor member configured
to detect presence or absence of the yarn accumul-ated in
the yarn accumul-ating section.
The optical sensor can contactl-essl_y detect the
presence or absence of the yarn, and thus can obtain an
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accurate detection result without affecting the winding of
the yarn. Since the sensor is a contactless type, it does
not adversely affect the quality of the yarn.
The yarn winding machine described above is
preferably configured as below. fn other words, the yarn
winding machine further incl-udes a yarn joining device
configured to connect a disconnected yarn when the yarn
between the yarn supplying section and the yarn
accumul-ating section is disconnected. During the
execution of the yarn joining operation by the yarn joining
device, the control- section stops the accumulated amount
control and the adjustment width reducti-on control-, and
continues the winding of the yarn by the winding section.
In other words, during the execution of the yarn
joining operation, the supply of yarn from the yarn
supplying section is interrupted, and hence the accumulated
amount control- and the adjustment width reduction contro1
are stopped. However, in this case as well-, the winding
section can continue the winding of the yarn accumul-ated
in the yarn accumulating section. Thus, the production
efficiency of the package can be enhanced. Eurthermore,
si-nce the stopping of the rotatj-on of the package in the
winding section is reduced, the damages on the yarn can be
suppressed. The yarn quality is thus not affected.
In the winding machine described above, the yarn
supplying section may be configured to hold a yarn supplying
bobbin wound with a spun yarn, and supply the spun yarn
unwound from the yarn supplying bobbin.
The configuration of the present invention thus can
be applied to the yarn winding machine that winds the yarn
from the yarn supplying bobbin. fn this type of yarn
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winding machine, the supply of yarn is interrupted when the
yarn supplying bobbin is replaced in the yarn supplying
section. However, in this case as wel-l, the winding section
can continue the winding of the yarn accumul-ated in the yarn
accumul-ating section. Thus, the producti_on efficiency of
the package can be enhanced. Furthermore, since the
stopping of the rotati-on of the package in the winding
section is reduced, the damages on the yarn can be
suppressed. The yarn quality is thus not affected.
The yarn winding machi-ne described above may have the
following configuration. In other words, the yarn
supplying section includes a draft device configured to
draft a fj-ber bundle, and a spinning device confi-gured to
spin the fiber bundle drafted by the draft device. The yarn
supplying section suppl-ies the spun yarn spun by the
spinning devj-ce.
Therefore, the configuration of the present
invention can al-so be applled to a spinning machine that
winds the spun yarn spun by the spinning device. Since the
yarn accumulating section is arranged between the spinnlng
device and the winding section, the speed fluctuation of
the winding section can be absorbed in the yarn accumulating
section. The speed fluctuation is thus prevented from
affecting the spinning speed, and the spun yarn can be spun
at a stable spinning speed.
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WE CLAIM:
1. A yarn winding machine characterized by
comprising:
a yarn supplying section in a yarn suppliabl-e state;
a yarn accumulating sectj-on configured to accumul-ate
a yarn supplied from the yarn supplying sectioni
a windlng section configured to wind the yarn
accumul-ated in the yarn accumulating section to form a
package;
a detecting section configured to detect information
associated with an accumulated amount of the yarn in the
yarn accumulating section;
an entrance speed adjustment device configured to
adjust a speed of the yarn entering the yarn accumulating
section,'
an exit speed adjustment devj-ce configured to adjust
a speed of the yarn exiting from the yarn accumulating
section; and
a control- section configured to carry out an
accumul-ated amount contro1 of adjusting the accumulated
amount by carrying out the adjustment of the speed of the
yarn by the entrance speed adjustment device and/or the exit
speed adjustment device within a range of a predetermined
adjustment width, wherein
the control- section is configured to carry out an
adjustment width reduction control of reducing the
adjustment width to a target val-ue based on the information
detected by the detecting section.
2. The yarn winding machine according to clai-m 1,
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characterized in that the control- secti-on is configured to
realize the accumulated amount control by carrying out the
adjustment of the speed of the yarn by the exit speed
adjustment device within the range of the predetermined
adjustment width, and to realize the adjustment width
reduction control- by lowering an upper limit of the
adjustment width or raising a lower limit of the adjustment
width.
3. The yarn winding machine according to cLaim 2,
characterized in that
the detecting section is configured to detect whether
the accumulated amount is greater than or equal to, or less
than a target amount,
the yarn winding machine further incl-udes a timer
configured to measure a length of an amount reducing process
period, which is a period in which the accumulated amount
is greater than or equal to the target amount, and a length
of an amount increasing process period, which is a period
in which the accumul-ated amount is less than the target
amount, and
the control- section is configured to
realize the accumulated amount control- by
controlling the exit speed adjustment device at the upper
limlt of the adjustment width when the accumul-ated amount
is greater than or equal to the target amount, and
control-l-ing the exit speed adjustment device at the lower
l-imit of the adjustment width when the accumulated amount
is less than the target amount, and
real-ize the adjustment width reduction controlby
raislng the lower l-imit of the adjustment width when the
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length of the amount reducj-ng process period is greater than
or equal to the length of the amount j-ncreasing process
period, and l-owering the upper Iimit of the adjustment width
when the length of the amount reducing process period is
fess than the length of the amount increasing process
period.
4. The yarn winding machine according to claim 3,
characterized in that
the control section is configured to shift from the
adjustment width reduction contro1 to an adjustment width
maintaining control- after the adjustment width of the exit
speed adjustment device becomes the target val-ue, and
in the adjustment width maintaining control,
the control section is configured to raise the
upper timit and the l-ower limit of the adjustment width
whil-e maintaining the adjustment width when the length of
the amount reducing process period is greater than or equal
to the length of the amount increasing process period, and
to lower the upper l-imit and the lower limit of the
adjustment width while maintaining the adjustment width
when the length of the amount reducing process peri-od is
l-ess than the length of the amount J-ncreasing process
period.
5. The yarn winding machine according to claim 1,
characterized in that
the entrance speed adjustment device is configured
to reali-ze the accumul-ated amount control by carryj-ng out
the adjustment of the speed of the yarn within the range
of the predetermined adjustment width, and
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the control section is configured to rea.l-ize the
adjustment width reduction control by lowering the upper
l-imit of the adjustment width or raising the lower limit
of the adjustment width.
6. The yarn winding machine according to claim 5,
characterized in that
the detecting section is configured to detect whether
the accumul-ated amount is greater than or equal to, or less
than a target amount,
the yarn winding machine further includes a timer
configured to measure a length of an amount reducing process
period, which is a period in which the accumulated amount
is greater than or equal to the target amount, and a length
of an amount increasing process period, which i-s a period
in which the accumulated amount is less than the target
amount, and
the contro1 section is configured to
realize the accumulated amount control- by
controlling the entrance speed adjustment device at the
.l-ower limit of the adjustment width when the accumulated
amount is greater than or equal to the target amount, and
controlling the entrance speed adjustment devj-ce at the
upper limit of the adjustment width when the accumulated
amount is l-ess than the target amount, and
realize the adjustment width reduction controf
by lowering the upper limit of the adjustment width when
the length of the amount reducing process period is greater
than or equal to the length of the amount increasing process
period, and raising the lower limit of the adjustment width
when the length of the amount reducing process peri-od is
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less than the Iength of the amount increasing process
period.
1. The yarn winding machine according to claim 6,
characterized in that
the control section is configured to shift from the
adjustment width reduction contro1 to an adjustment width
maintaining control after the adjustment width of the
entrance speed adjustment device becomes the target va1ue,
and
in the adjustment width maintaining control,
the control section is configured to lower the
upper limit and the l-ower limit of the adjustment width
whil-e maintaining the adjustment width when the length of
the amount reducing process period is greater than or equal
to the length of the amount increasing process period, and
to raise the upper Iimit and the lower limit of the
adjustment width while maintaining the adjustment width
when the }ength of the amount reducing process period is
Iess than the Iength of the amount increasing process
period.
8. The yarn winding machine according to any one of
cl-aims 1 to 7, characterized in that the detecting section
is an optical sensor member configured to detect presence
or absence of the yarn accumul-ated in the yarn accumul-ating
secti-on.
9. The yarn winding machine accordj-ng to any one of
claims 1 to 8, characterized by further comprising a yarn
joining device configured to connect a dj-sconnected yarn
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when the yarn between the yarn supplying section and the
yarn accumulating section is disconnected, wherein
the controL section is configured to stop the
accumulated amount control and the adjustment width
reduction control, and continues the winding of the yarn
by the winding sectj-on during execution of the yarn joining
operation by the yarn joining device.
10. The yarn winding machine according to any one
of claims 1 to 9, characterized in that the yarn supplying
section is configured to hol-d a yarn supplying bobbin wound
with a spun yarn, and to supply the spun yarn unwound from
the yarn supplying bobbin.
11. The yarn windlng machine according to any one
of cLaims 1 to 9, characterized in that
the yarn supplying section incl-udes
a draft device configured to draft a fiber
bundle, and
a spinning device configured to spin the fiber
bund1e drafted by the draft device, and
the yarn supplying sectj-on is configured to supply
the spun yarn spun by the spinning device.
72. A yarn winding method for accumulating a yarn
pulled out from a yarn supplying section in a yarn
accumul-ating section, and pulling out the yarn accumulated
in the yarn accumulating section to form a package, the
method characterized by comprising:
carrying out adjustment of an entrance speed, which
is a speed of a yarn entering the yarn accumulating section,
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and adjustment of an exit speed, which is a speed of a yarn
exiting from the yarn accumulating section, within a range
of a predetermined adjustment width; and
detecting j-nformation associated with an accumul-ated
amount of the yarn to carry out an adjustment width
reduction control of reducing the adjustment width to a
target val-ue.
13. The yarn winding method according to claim 12,
characterized in that the accumul-ated amount control- is
real-j-zed by carrying out the adjustment of the exit speed
within the range of the predetermined adjustment width, and
the adjustment width reduction control is real-ized by
Iowering an upper l-imit of the adjustment width or raising
a lower limit of the adjustment width.
14. The yarn winding method according to claim 13,
characterized by further comprising:
detecting whether the accumulated amount is greater
than or equal to, or }ess than a target amount;
measuring a length of an amount reducing process
period, which is a period in which the accumul-ated amount
is greater than or equal to the target amount, and a length
of an amount increasi-ng process period, which is a period
in which the accumul-ated amount is l-ess than the target
amount;
realiztng the accumulated amount control- by
controlling the adjustment of the exit speed at the upper
limit of the adjustment width when the accumulated amount
is greater than or equal to the target amount, and
control-Iing the adjustment of the exit speed at the lower
limit of the adjustment width when the accumul-ated amount
is less than the target amount; and
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real-iz:-ng the adjustment width reduction control by
raising the l-ower l-imit of the adjustment width when the
length of the amount reducing process period is greater than
or equal- to the length of the amount increasj_ng process
period, and lowering the upper fimit of the adjustment width
when the length of the amount reducing process period is
l-ess than the length of the amount increasing process
period.
15. The yarn winding method according to claim 14,
characterized by further comprising:
shifting from the adjustment width reduction controlto
an adjustment width maintaining control after the
adjustment width in the adjustment of the exit speed becomes
the target value, wherein
in the adjustment width maintaining control,
the upper limit and the lower limit of the adjustment
width are raised while maintaining the adjustment width
when the length of the amount reducing process period is
greater than or equal to the length of the amount increasj_ng
process period, and
the upper l-imit and the lower limit of the adjustment
width are l-owered whil-e maintaining the adjustment width
when the length of the amount reducing process period is
less than the length of the amount increasing process
period.
16. A package wound by the yarn winding method
according to any one of cl-aims 12 to 15.