YARN WINDING MACHINE
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a yarn winding machine adapted to
form a package by winding a spun yarn.
2. DescriptiJn of the Related Art
Conventionally, there is known a yarn winding machine adapted
to wind a spcn yarn by rotating a bobbin and forming a package on
the bobbin (~ee e.g., Japanese Unexamined Patent Publication No.
2011-144029). The yarn winding machine includes a catching section
adapted to cat.ch a yarn end of the package, and a yarn joining section
adapted to join yarn ends.
As illustrated in FIG. SA, a catching section Be catches a
yarn end YEc by sucking air. The catching section Be is swung while
sucking and holding the yarn end YEc to pull out a spun yarn Yc
from a package Pc. The yarn joining section joins a yarn end YEc
of the spun yarn Yc pulled out from the package Pc and a yarn end
from a yarn sut:·plying bobbin (not illustrated). By joining the yarn
end YEc from the package Pc and the yarn end from the yarn supplying
bobbin, the yarn winding machine can resume forming of the package
Pc. An operation rate of the yarn winding machine is influenced
by whether not the catching of the yarn end YEc by the catching
section Be is successful.
As illustrated in FIG. BB, if the catching section Be cannot
catch the yar:1 end YEc, the yarn joining operation cannot be
performed. The operation of the yarn winding machine thus needs
to be stopped, and the operation rate of the yarn winding machine·
lowers. As illustrated in FIG. 8C, if the catching section Be sucks
a middle part o:: the spun yarn Yc, the yarn joining operation cannot
be performed. The operation of the yarn winding machine thus needs
to be stopped, and the operation rate of the yarn winding machine
lowers. As ilL.1strated in FIG. so; if the catching section Be sucks
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tte middle :>art of the spun yarn Yc and the spun yarn Yc is broken,
a waste yarn W is mixed into the package Pc.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a yarn winding
machine capable of easily catching a yarn end of a package formed
by winding a spun yarn.
A yarn winding machine comprises a bobbin holding section
adapted to rotatably hold a bobbin, a yarn information detecting
section adapted to detect continuation or discontinuation of a spun
yarn to be wcund into the bobbin, a package driving section adapted
to rotate the bobbin or a package formed on the bobbin, and a control
section adapted to control the package driving section in accordance
·with a detection signal from the yarn information detecting section,
wherein when the yarn information detecting section detects
discontinuation of the spun yarn, the control section is adapted
to control t~e package driving section to stop rotation of the
package to st :>p a yarn end of the package at a prescribed position.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view illustrating an overall
configuration of a yarn winding machine;
FIG. 2 is a side view illustrating a catching operation of
a yarn end;
FIG. 3 is a side ·view.illustrating a pull-out operation of
the yarn end;
FIG. 4 is a view illustrating a stop position of the yarn end;
FIG. 5 is a view illustrating a stop position of the yarn end;
FIG. 6 is a view illustrating a stop position of the ·yarn end;
FIG. 7 iE a view illustrating a stop position of the yarn end;
and
FIG. SA to FIG. 8D are views illustrating a state during
catching of the yarn end in a conventional yarn winding machine.
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DE~AILED DESCRIPTION OF PREFERRED EMBODIMENTS
First, a yarn winding machine 100 according to one embodiment
of the present invention will be described.
FIG. 1 is a schematic view illustrating an overall
configuraticn of the yarn winding machine 100. A white arrow in
the drawing indicates a feeding direction of a spun yarn Y ..
The yarn winding machine 100 includes a yarn supplying section
1. A yarn supplying bobbin SB, around which the spun yarn Y is wound,
is set in the yarn supplying section 1. The yarn winding machine
100 includes a yarn-unwinding assisting section 2, a tension
applying section 3, a yarn joining section 4, a yarn information
detecting section 5, a traverse section 6, and a winding section
7, along a feeding direction of the spun yarn Y unwound from the
yarn supplyi·.:1g bobbin SB. The yarn winding machine 100 also
includes a catching section 8, a guiding section 9, and a control
section 10.
The yarn-unwinding assisting section 2 assists the unwinding
of the spun y2rn Y wound around the yarn supplying bobbin SB. The
yarn-unwinding assisting section 2 restricts the spun yarn Y unwound
from the yarn supplying bobbin SB from spreading by a centrifugal
force.
The tension applying section 3 applies a predetermined
tension on the spun yarn Y unwound from the yarn supplyin_g bobbin
SB. The tension applying section 3 applies the predetermined
tension on the spun yarn Y to enable high-speed winding of the spun
yarn Y. Other than a gate-type tensor adapted to apply tension on
the spun yarn Y with comb teeth, a disc-type tensor may be used
for the tension applying section 3.
The yarn joining secti.on 4 joins the yarn ends YE of the spun
yarn Y. For example, when the spun yarn Y is broken, the yarn joining
section 4 join3 the yarn ends YE of the disconnected spun yarn Y.
Other than an air splicer device adapted to join the yarn ends YE
of the spun yar:1 Y by whirling airflow, a mechanical splicer device
and the like m3y be used for the yarn joining section 4.
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The yarn information detecting section 5 is adapted to detect
a defective part of the spun yarn Y. The yarn information detecting
section 5 is adapted to detect continuation or discontinuation of
the spun . yarn Y. The yarn information detecting section 5
irradiates the spun yarn Y with a light emitting diode as a light
source, and measures a reflected light quantity from the spun yarn
Y to detect presence or absence of the defective part of the spun
yarn Y, and the continuation or discontinuation of the spun yarn
Y. Specifically, an analyzer 51 analyzes a detection signal from
the yarn 2.nformation detecting section 5 to determine the presence
or absence of the defective part of the spun yarn Y, and the
continuation or discontinuation of the spun yarn Y .. A cutter 52
capable of cutting the spun yarn Y is provided in proximity to the
yarn information d~tecting section 5. A unit control section lOc
can also receive information on the discontinuation of the spun
yarn Y by a cut signal of the spun yarn Y cut by the cutter 52.
In addition to abnormality in which a portion of the spun yarn
Y is too thick (thick yarn) or too thin (thin yarn), the defective
part of the spun yarn Y includes foreign substances contained in
the spun yarn Y. The discontinuation of the spun yarn Y is a concept
including cases where the spun yarn Y is cut by the cutter 52, where
the spun yarn y is broken when an abnormal tension is applied, and
where the spun yarn Y wound around the yarn supplying bobbin SB
are all unwound. Other than an optical sensor described above, the
yarn information detecting section 5 may be a capacitance sensor
or the like.
The traverse section 6 is adapted to traverse the spun yarn
Y to be guided to a package P. The traverse section 6 includes a
traverse guide 61 and a traverse guide driving section 62. The
trav~rse guide driving section 62 drives the traverse guide 61 based
on a control signal from a traverse guide drive control section
lOa. ·The traverse guide drive control section lOa transmits the
control signal to the traverse guide driving section 62 based on
an instruction from the unit control section lOc. The control
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section 10 has a concept including the traverse guide drive control
section lOa and the unit control section lOc.
The traverse guide 61 is an arm member provided with a hook
section adapted to hook the spun yarn Y. The traverse guide 61
reciprocates in a rotational axis direction of a bobbin TB with
· the spun yarn Y hooked to the hook section (see black arrow in FIG.
1), and traverses the spun yarn Y.
The traverse guide driving section 62 is mainly configured
by a servomotor. The traverse guide driving section 62
reciprocates the traverse guide 61 by forwardly rotating or
reversely rotating a rotation shaft of the servomotor. The
traverse guide driving section 62 uses q servomotor for a power
source, but for example, a stepping motor or the like may also be
used, and any type of motor can be used. · A direction of the rotation
shaft of the servomotor, that is, an attaching direction of the
traverse guide 61, is also not limited.
The traverse section 6 is configured as a so-called arm-type
traverse device in which the spun yarn Y is traversed by the
reciprocating traverse guide 61. However, other than the arm-type
traverse device, a belt-type traverse device, a rotary traverse
device, or the like may be used. The yarn winding machine 100 may
be_a traverse drum-type, which is a structure in which a drum that
rotates while making contact with the package P is arranged, and
the spun yarn Y is traversed by a guiding groove formed on a surface
of the drum.
The '.Ninding section 7 rotates the bobbin TB to wind the spun
yarn Y. The winding section 7 includes a bobbin holding section
71, a contact roller 72, and a package driving section 73. The
package driving section 73 rotates the bobbin TB based on a control
signal fron a package drive control section lOb. The package drive
control section lOb transmits the control signal to the package
driving section 73 based on an instruction from the unit control
section lOc. The control section 10 has a concept including the
package drive control section lOb and the unit control section lOc.
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The bobbin holding section 71 includes a bearing for
detachably gripping the bobbin TB, and rotatably holds the bobbin
TB. The bobbin holding section 71 can swing with a swing shaft 74
as center (see arrow in FIG. 2). Even if an outer diameter of the
package P becomes large accompanying winding of the spun yarn Y,
the bobb.::..n holding section 71 enables the contact roller 72 to push
the surface of the package P at a prescribed load.
The co~tact roller 72 rotates accompanying the rotation of
the rotating package P. The contact roller 72 adjusts a shape of
the package P by pressing the surface of the package P. The contact
roller 72 is a substantially cylindrical rotating body, but may
also be a conical rotating body, for example, and may be of any
shape.
The package driving section 73 is mainly configured by a
servomotcr. The package driving section 73 drives the servomotor
to rotate the bobbin TB and the package P formed on the bobbin TB.
The package driving section 7 3 uses a servomotor as the power source,
but for example, a stepping motor or the like may also be used,
and any type of motor can be used. Advantages of using the
servomotor for the power source of the package driving section 7 3
will be described later.
The winding section 7 is configured such that the package P
is rotated by the package dti ving section 7 3, and the contact roller
72 is rotated accompanying the rotation of the package P. However,
the contact roller 7 2 may be rotated by the package driving section
73, and the package P may be rotated accompanying the rotation of
the contact roller 72. •
When the spun yarn Y becomes discontinuous, the catching
section 8 catches the yarn end (upper yarn) YE of the spun yarn
Y wound into the package P. The catching section 8 is swung while
sucking and holding the yarn end YE to pull out the spun yarn Y
from the package P. Specifically, when the yarn joining operation
is started, the catching section 8 is swung such that a suction
opening 8m moves from a standby position to a proximity of the
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package P (see arrow in FIG. 2), and catches the yarn end YE by
sucking air from the suction opening Sm. The catching section 8
is swung sucj that the suction opening 8m moves from the proximity
of the package P to an upstream of the yarn joining section 4 while
sucking and holding the yarn end YE (see arrow in FIG. 3) , and pulls
out the spun yarn Y from the package P. In this case, the package
driving section 7 3 reversely rotates the bobbin TB and the package
P (see arrow in FIG. 3) • Other than the suction arm-type described
above, the C3tching section 8 may have a configuration in which
a slit is provided in a fixed suction pipe to pull out the spun
yarn Y.
When the spun yarn Y becomes discontinuous, the guiding
section 9 catches the yarn end (lower yarn) YE of the spun yarn
Y wound around the yarn supplying bobbin SB. The guiding section
9 is swung while sucking and holding the yarn end YE to unwind the
spun yarn Y f~om the yarn supplying bobbin SB. Specifically, the
guiding section 9 catches the yarn end YE by sucking air from a
suction opening 9m. The guiding section 9 is swung such that the
suction openi~g 9m moves from the proximity of the yarn supplying
bobbin SB to a downstream of the yarn joining section 4 while sucking
and holding the yarn end YE (see arrow in FIG. 3), and unwinds the
spun yarn Y fLom the yarn supplying bobbin SB.
The yarn end YE of the spun yarn Y arranged at a prescribed
position by the catching section 8 and the yarn end YE of the spun
yarn Y arranged at a prescribed position by the guiding section
9 are joined by the yarn joining section 4. Accordingly, the yarn
winding machi~e 100 can resume forming of the package P. An
operation rate of the yarn winding machine 100 is influenced by
whether or not -:he catching of the yarn end YE by the catching sec·tion
8 is successfc.l.
Next, a description will be made on characteristics of the
yarn winding ffiachine 100 configured so that the catching of the
yarn end YS by the catching section 8 is successful.
The yarn winding machine 100 can control a rotating state of
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the package P until the rotation of the package P completely stops.
Therefore, the yarn winding machine 100 can control the package
driving sect:...on 73 so that the yarn end YE of the spun yarn Y wound
into the package P stops at the prescribed position.
Specif:...cally, when the yarn information detecting section 5
detects disccntinuation of the spun yarn Y, the yarn winding machine
100 stops the rotation of the package ·p. The conventional yarn
winding machine shields the servomotor power source of the package
driving section 7 3 to stop the· rotation of the package P. The yarn
winding machine 100 according to the present embodiment
appropriatel~· adjusts a command pulse to be transmitted to a driver
(not illustrated) to stop the rotation of the package P while
controlling the rotating state of the package P. The yarn winding
machine 100 may include a braking device such as an electromagnetic
brake for the package driving section 73 to stop the rotation of
the package F.
Fur~her~ore, after stopping the rotation of the package P,
the yarn winding machine 100 may rotate the package P again to stop
the yarn e:1d YE at an arbitrary position. Since the control section
10 can freely ::ontrol the rotating state of the package P, the yarn
end YE can be stopped at an arbitrary position by a simple control
program. The configuration in which after stopping the rotation
of the package P, the package P is rotated again to stop the yarn
end YE at an arbitrary position is also encompassed· within a
technical scope of the invention.
The yarn winding machine 100 can stop the rotation of the
package P to stop the yarn end YE of the package P at the prescribed
position. Accordingly, the catching section 8 can easily catch the
yarn end YE of the package P.
In'the yarn winding machine 100 of the present embodiment,
"prescribed position" refers to the proximity of the catching
section 8. More specifically, "prescribed position" refers to the
proximity of tje suction opening 8m when catching the yarn end YE
(see FIG. 2).
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The yarn winding machine 100 can stop the rotation of the
package P to stop the yarn end YE-of the package Pin proximity
to the catching section 8. Accordingly, the yarn end YE of the
package P can be easily caught by the catching section 8.
The catching section 8 catches the yarn end YE by sucking air.
The conventional yarn winding machine has a possibility ~hat the
catching section 8 sucks the middle part of the spun yarn Y (see
FIG. 8C and FIG. 80)~ Since the yarn winding machine 100 can stop
the rotation of the package P to stop the yarn end YE of the package
P in proximi~y to the catching section 8, the catching section 8
can be prevented from sucking the middle part of the spun yarn Y.
Next, the "proximity to the catching section 8" will be more
specifically described. The "proximity to the catching section 8"
refers to a.range in which the possibility that the yarn end YE
can be caught by the catching section 8 beco·mes high. The range
in which the possibility that the yarn end YE can be caught by the
catching section 8 becomes high is referred to as a catching range
Aa.
As illustrated in FIG. 4, an imaginary line IL connecting a
rotational axis A of the package P and the suction opening 8m of
the catching section 8 is provided as a reference, and the catching
range Aa is defined to be a rang_e within a prescribed angle a from
the imaginary line IL with the rotation axis A of the package P
as center. In the yarn winding machine 100 according to the present
embodiment, the prescribed angle a is about 90 degrees. A value
of about 90 degrees is a value obtained by repeating substantive
experiments with the probability of success of the catching of the
yarn end YE by the catching section 8 as a parameter.
The yarn winding machine 100 can stop the rQtation of the
package P to stop the yarn end YE of the package P within the catching
range Aa. The catching range Aa is a range in which the possibility
that the yarn end YE of the package P can be caught is high. A range
of about 90 degrees from the imaginary line IL in the rotating
direction {winding direction) and the reverse rotating direction
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(unwind~ng jirection) of th~ package P is a range in which the
possibility that the yarn end YE of the package P can be caught
becomes higter. Accordingly, the yarn end YE of the package P can
be easily caught by the catching section 8.
In ord:=r to further improve the probability of success of the
catching of the yarn end YE by the catching section 8, the catching
range Aa is ·preferably reduced. Specifically, as illustrated in
FIG. 5, the prescribed angle a is about 45 degrees. The value of
about 45 degrees is a value obtained by repeating substantive
experiments vith the probability of success of the catching of the
yarn end YE oy the catching section 8 as a parameter.
A range of about 45 degrees from the imaginary line IL in the
rotating direction and the reverse rotating direction of the package
P is a ra~ge in which the possibility that the yarn end YE of the
package P can be caught is the highest. Accordingly, the yarn end
YE of the package P can be easily caught by the catching section
8.
In order to improve the probability of success of the catching
of the yarn end YE by the catching section 8, the influence of gravity
may be taken into consideration. Specifically, as illustrated in
FIG. 6, the rcnge in which the yarn end YE of the package P stops
to be substa~tially along the anti-gravitational direction is
defined as the catching range Aa. When the yarn end YE stops to
be substantially along the anti-gravitational direction, the yarn
end YE is ~ot HOund around the package P but is floating from the
surface of the ~ackage P. The arrow illustrated in FIG. 6 indicates
a gravitationcl direction and a direction of the yarn end YE.
The range in which the yarn end YE of the package P stops to
be substantially along the anti-gravitational direction is the
range in which the yarn end YE of the package P floats from the
surface of the package P. When the yarn end YE of the package P
stops within the catching range Aa, the possibility that the
catching secticn 8 can catch the yarn end YE of the package P becomes
high. Accordir.gly, the yarn end YE of the package P can be easily
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caught by the catching section 8.
The yarn winding machine 100 can move the package P away from
the contact roller 7 2 (see e.g., Japanese Unexamined Patent
Publication No. 2010-13259). In the yarn winding ma.chine 100, even
if the package P is rotated before catching the yarn end YE with
the catcjing section 8, the contact roller 72 does not press the
yarn end YE. In a case where the package P cannot be moved away
from the contact roller 72, the following configuration is
preferable.
As illustrated in FIG. 7, it is important to stop the rotation
of the package P to stop the yarn end YE of the package P outside
a pressec range Sa. The pressed range Sa is a range in which the
yarn end YE is pressed by the contact roller 72 when the package
P is rotated before catching of the yarn end YE of the package P.
Spe:::::ifically, the yarn winding machine 100 reversely rotates
(rotates in a direction opposite to the winding direction) the
package P before the catching section 8 catches the yarn end YE
(see FIG. 3). If the yarn end YE stops within the pressed range
Sa, the yarn end YE is pressed by the contact roller 72 and attached
to the sur£ace of the package P. Therefore, if the yarn end YE of
~he package P stops outside the pressed range Sa, the possibility
that the catching· section 8 can catch the yarn end YE of the package
P beco~es higher. Accordingly, the yarn end YE of the package P
can be ea~ily caught by the catching section 8.
Next, a configuration for enabling the rotation of the package
P to be stopped such that the yarn end YE of the package P is stopped
at an arbitrary position will be described.
The package driving_ section 73 includes an angle phase
detecting section (encoder, not illustrated) (rotational amount
detecting section) capable of detecting an angle phase of a
rotational axis of the servomotor. The angle phase of the
rotational axis of the package driving section 7 3 has a correlation
with ~he yarn end YE of the package P. Therefore, the control
section 10 can recognize the number of rotations of the package
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P until :.he yarn end YE reaches the package P. The control section
10 can indirectly obtain the position of the yarn end YE of the
package P based on an angle phase signal from the package driving
section 73.
Wh2n receiving information on the discontinuation of the spun
yarn Y based on the signal from the yarn information detecti~g
section 5 or the cutter 52, the control section 10 can calculate
at which position the yarn ·end YE from the package P can be stopped
by deterrr:_ining the rotational amount of the package driving section
7 3 in accordance with the distance from the yarn information
detecting section 5 or the cutter 52 to the package P, the outer
diameter of the package P, and the angle phase signal from the
package driving section 73.
If there is a possibility that the yarn end YE stops beyond
the catching range Aa in the control for stopping the rotation of
the package P, the control section 10 controls the package driving
section 73 to shorten a braking time of the package P to stop the
yarn end YE within the catching range Aa. If there is a possibility
that the yarn end YE stops before the catching range Aa in the control
for stopping the rotation of the package P, the control section
10 controls the package driving section 73 to extend the braking
time of the package P to stop the yarn end YE within the catching
range Aa.
Next, a specific configuration and a control manner will be
further described.
The yarn winding machine 100 includes a rotation speed
detecting section (rotational amount detecting section) 75 in the
bobbin holding section 71 (see FIG. 1). The rotation speed
detecting section 75_detects a pulse signal from a rotating pulse
board, and transmits the pulse signal to the control section 10.
The control section 10 calculates the number of rotations (rotation
speed) (rotational amount) of the package P (the bobbin TB) based
on the pulse signal received per unit time.
Furthermore, the yarn winding machine 100 includes a wound
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. <
amount detecting section 76. The wound amount detecting section
76 detects a pulse signal from the travelling spun yarn Y, and
transmits the pulse signal to the control section 10. The control
section 10 can calculate the length of the wound spun yarn Y by
integrating the received pulse signals. The control section 10
calculates the outer diameter of the package P from the length of
the wound sp~n yarn Y. Specifically, the control section 10 can
calculate the outer diameter of the package P based on the length
of the wound spun yarn Y and a type (yarn count) of the spun yarn
Y. The control section 10 stores in advance the outer diameter of
the package P corresponding to the length of the wound spun yarn
Y and the type (the yarn count) of the spun yarn Y to simplify a
calculation process of the outer diameter of the package P.
The control section 10 can control the package driving section
73 to stop the yarn end YE at an arbitrary position in accordance
with a travelling amount of the spun yarn Y (the distance from the
yarn information detecting section 5 or the cutter 52 to the package
P, a period of time required for the yarn end YE to travel from
the yarn info~mation detecting section 5 to the package P and/or
a travelling speed when the yarn end YE travels from the yarn
information detecting section 5 to the package P), the outer
diameter of th:= package P, and the rotational. amount of the package
P.
The wound amount detecting section may be, for example, an
angle sensor such as an analog sensor or'an absolute sensor to be
attached to the bobbin holding section 71. The wound amount
detecting section as the angle sensor can detect a swing angle of
the bobbin jolding section 71. The swing angle of the bobbin holqing
section 71 has 3 correlation with the outer diameter of the package
P. The wound amount detecting section can indirectly detect the
outer diameter of the package P by detecting the swing angle of
the bobbin holding section 71.
The woun::i amount detecting section may be a timer for
measuring a wir.ding time of the spun yarn Y. The control section
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10 can calculate the length of the wound spun yarn Y based on the
measured winding time. The control section 10 calculates the outer
diameter of the package P from the length of the wound spun yarn
Y. The control section 10 stops a timer function while the winding
of the spt:.n yarn Y is interrupted to accurately measure the winding
time of the spun yarn Y.
In another embodiment, the yarn winding machine·100 may have
a speed detecting section adapted to calculate the travelling speed
of the spun yarn Y and arranged on a travelling path of the spun
yarn Y. In th::.s case, the control section 10 can calculate a winding
angle from the iravelling speed of the spun yarn Y and ~ driving
speed of the traverse guide 61. Accordingly, the control section
10 can calculate the outer diameter of the package P from the winding
angle, a peripheral speed of the package P, and the number of
rotations of ~he package P.
The yarn winding machine 100 can control the package driving
section 73 in accordance with the rotation speed (the number of
rotations) (the rotational amount) of the package P and the wound
amount (used synonymously as the outer diameter of the package P) .
Accordingly, the yarn winding machine 100 can accurately stop the
yarn end YE of the package P at an arbitrary position.
In the yarn winding machine 100, since the package driving
section 73 uses the servomotor as the power source, the feedback
control can be realized. Accordingly, the yarn winding machine 100
can accurately stop the yarn end YE of the package P at an arbitrary
position.
A first aspect of the invention relates to a yarn winding
machine adaptej to form a package by winding a spun yarn. A yarn
winding machine according to an embodiment of the present invention
includes a bobbin holding section, a yarn information detecting
section, a package driving section, and a control section. The
bobbin holding section is adapted to rotatably hold a bobbin. The
yarn information detecting section is adapted to detect
continuation or discontinuation of a spun yarn to be wound around
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the bobbin. The package driving section is adapted to rotate the
bobbin or a p3ckage formed on the bobbin. The control section is
adapted to control the package driving section in accordance with
a detection Eignal from the yarn information detecting section.
When the y3rn ::..nformation detecting section detects discontinuation
of the spun yarn, the control section controls the package driving
section to st~p rotation of the package to stop a yarn end of the
package at a prescribed position.
AccordL1.gly, the yarn end of the package can be easily caught.
A second aspect of the invention relates to the yarn winding
machine according t6 the first aspect. The yarn winding machine
according to the embodiment of the present invention includes a
catching·section. The C?~ching section is adapted to catch the yarn
end of the spun yarn. The control section is adapted to control
the package driving section to stop rotation of the package to stop
the yarn end'of the package in proximity of the catching section.
Accordir:gly, the yarn end of the package can be easily caught
by the catching section.
A third 3spect of the invention relates to the yarn winding
machine accorcing to the second aspect. The catching section is
adapted to catch the yarn end of the package by sucking air.
Sine: th-= rotation of the package can be stopped to stop the
yarn end of the package in proximity to the catching section, even
when catching the yarn end by sucking air, the catching section
can catch the yarn end while avoiding the sucking of the middle
part of the spun yarn.
A fourth aspect of the invention relates to the yarn winding
machine according to the third aspect. An imaginary line
connecting a rotational axis of the package and a suction opening
of the catching section is provided as a reference, and a catching
range is determined to be within a prescribed angle from the
imaginary line with the rotational axis of the package as center.
The control section is adapted to control the package driving
section to stop rotation of the package to stop the yarn end of
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the package vithin the catching range.
The cat,:::hing range is a range in which a possibility that the
yarn end of tje package can be caught becomes high. The yarn end
of the packa~e can be easily caught by the catching section.
A fifth aspect of the invention relates to the yarn winding
machine a::cording to the fourth aspect. The catching range is a
range of abourt 90 degrees from the imaginary line in a rotating
direction and a reverse rotating direction of the package.
The catching range of about 90 degrees from the imaginary line
1n the ro~ating direction and the reverse rotating direction of
the package is a range in which the possibility that the catching
section can catch the yarn end of the package becomes higher.
Accordingly, ~he yarn end of the package can be easily caught by
the catch~ng 3ection.
A sixth aspect of the invention relates to the yarn winding
machine according to the fourth aspect. The catching range i~ a
range of about 45 degre~s from the imaginary line in a rotating
direction and a reverse rotating direction of the package.
The catching range of about 45 degrees from the imaginary line
in the rotating direction and the reverse rotating direction of
the package is a range in which the possibility that the catching
section can catch the yarn end of the package becomes even more
higher. Accordingly, the yarn end of the package can be easily
caught by the catching section.
A sevent:-1 aspect of the invention relates to the yarn winding
machine according to the fourth aspec~. The catching range is a
range in which the yarn end of the package stops to be substantially
along an anti-gravitational direction.
The catching range in which the yarn end of the package stops
to be substantially along the anti-gravitational direction is a
range in which the yarn end of the package floats from a surface
of the package. Therefore, when the yarn end of the package stops
within the catc:-ting range, the possibility that the catching section
can catch the yarn end of the package becomes higher. Accordingly,
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the yarn end of the package can be easily caught by the catching
section.
An eighth aspect of the invention relates to the yarn winding
machine according to any one of the first to seventh aspects. The
yarn winding machine according to the embodiment of the present
inventio~ further includes a contact roller. The contact roller
is adapted to rotate while making contact with the package. A
pressed range is defined as a range in which the yarn end is pressed
by the contact roller when the package is rotated after the yarn
information detecting section detects discontinuation of the spun
yarn. The control section is adapted to control the package driving
section to stop rotation of the package to stop the yarn end of
the package outside the pressed range.
The pressed range is a range in which the yarn end is pressed
by the contact roller by rotating the package when catching the
yarn end of the package. Therefore, if the yarn end of the package
is stopped o~tside the pressed range, the possibility-that the
catching section can catch the yarn end of the package becomes higher.
Accordingly, the yarn end of the package can be easily caught by
the catching section.
A nintt aspect of the invention relates to the yarn winding
machine aGcording to any one of the first to eighth aspects. The
yarn winding ~achine according to the embodiment of the present
invention fuiTther includes a rotational amount detecting section,
and a wound 3mount detecting section. The rotational amount
detecting secrtion is adapted to detect a rotational amount of the
package. ThJ wound amount detecting section is adapted to detect
a wound amoudt of the package. The control section is adapted to
control tile \package driving section in accordance with the
rotational amount and the wound amount of the package.
Accordingly, the yarn end of the package can be accurately
stopped at an arbitrary position.
A tenth aspect of the invention relates to the yarn winding
machine according to any one of the first to ninth aspects. The
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package dri v.ing section is configured by a servomotor.
A feedback control can be realized by using the servomotor.
Accordingly, the yarn end of the package can be accurately stopped
at an arbitr3ry position.
18/22

WE CLAIM
1. A yarn winding machine comprising:
a bobbin holding section adapted to rotatably hold a bobbin,
a yarn information detecting section adapted to detect
continuation or discontinuation of a spun yarn to be wound into
the bobbin,
a package driving section adapted to rotate the bobbin or a
package formed on the bobbin, and
a control section adapted to control the package driving
section in accordance with a detection signal from the yarn
information detecting section,
whe~ein when the yarn information detecting section detects
discon~in~atiorr of the spun yarn, the control section is adapted
to control the package driving section to stop rotation of the
package to stop a yarn end of the package at a prescribed position.
2. The yarn winding machine according to claim 1, further
comprising a catching section adapted to catch the yarn end of the
spun yarn,
wherein the control section is adapted to control the package
driving sectiop to stop rotation of the package to stop the yarn
end of the package in proximity of the catching section.
3. The yarn winding machine according to claim 2, wherein
the catching section is adapted to catch the yarn end of the package
by sucking ai~.
4. The yarn winding machine according to claim 3, wherein
an imaginary line connecting a rotational axis of the package and
a suction opening of the catching section is provided as a reference,
and a catching range is determined to be within a prescribed angle
from the imaginary line with the rotational axis of the package
as center, and
the contr-ol section is adapted to control the package driving
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section to stop rotation of the package to stop the yarn end of
the package ~ithin the catching range.
5. The yarn winding machine according to claim 4, wherein
the catching range is a range of about 90 degrees f-rom the imaginary
line in a winding direction and an unwinding direction of the
package.
6. The yarn winding machine according to claim 4, wherein
the catching range is a range of about 45 degrees from the imaginary
line in a winding direction and an unwinding direction of the
package.
7. The yarn winding machine according to claim 4, wherein
the catching range is a range in which the yarn end of the package
stops to be substantially along an anti-gravitational direction.
8. The yarn winding machine ·according to any one of.claim
1 through claim 7, further comprising a contact roller adapted to
rotate wh~le making contact with the package,
wherein a pressed range is defined as a range in which the
yarn end is pressed by the contact roller when the package is rotated
after tte yarn information detecting section detects
discontinuation of the spun yarn, and
the control section is adapted to control the package driving
section to stop rotation of the package to stop the yarn end of
the package outside the pressed range.
9. The yarn winding machine according to any one of claim
1 through claim 8, further comprising:
a rotational amount detecting section adapted to detect a
rotational amount of the package, and
a wound amount detecting section adapted to detect a wound
amount of the package,
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wherein the control section is adapted to control the package
driving section in accordance with the rotational amount and the
wound amount of the package.
10. The yarn winding machine accordi~g to any one of claim
1 through claim 9, wherein the package driving section is a
serv.omotor.
11. A yarn winding machine, substantially as herein
described with reference to ac.companying drawings.