TECHNICAL FIELD
[0001] The present disclosure relates to a yam winding machine, a yarn
winding method, and a yarn storage control program.
BACKGROUND
[0002] In a yam winding step of a spinning machine (yam winding
machine), winding tension is controlled by using a yarn storage device.
For example, Japanese Unexamined Patent Publication No.
2004-277949 discloses a spinning machine (air spinning device) in
which yam formed by a spinning device is wound as a package by a
winding device while slack of the yarn is being eliminated by storing
the yarn in a yam storage device (yam slack eliminating device). In
15 this spinning machine, when it is detected that the amount of slack
retained in the yarn storage device (storage amount) has decreased
below a predetermined amount, the package is separated from a rotating
drum to reduce the winding speed, whereby the amount of the slack
retained is increased.
20 SUMMARY
[0003] In a yarn winding machine including such a yam storage device,
the storage amount in the yarn storage device is preferably kept as
constant as possible to keep the tension constant. In particular, at the
time when winding of a winding device is started after yam has been
25 disconnected or a new bobbin has been set and during a predetermined
period of time after this start of winding, the storage amount of yarn in
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the yam storage device increases, and thus it is desired that the storage
amount be reduced as quickly as possible.
[0004] In view of this, one aspect of the present disclosure aims to
provide a yam winding machine, a yam winding method, and a yam
5 storage control program that makes it possible to quickly reduce the
storage amount in a yam storage device that has increased before
winding of a package is started in a winding device.
[0005] A yam winding machine according to one aspect of the present
disclosure includes: an air spinning device configured to form yarn with
10 airflow; a winding device configured to wind the yam formed by the air
spinning device to form a package; a yarn storage device disposed
between the air spinning device and the winding device and configured
to wind the yarn from the air spinning device around an outer peripheral
surface of a yarn storage roller thereby temporarily storing the yam; a
15 drive part configured to rotate the package in the winding device; and a
control part configured to perform storage-amount maintaining control
of maintaining storage amount of the yam in the yam storage device
within a predetermined storage range by repeatedly performing
acceleration control and deceleration control. The acceleration control
20 is control of increasing rotation speed of the drive part to a range
upper-limit speed equal to or higher than a storage-amount decreasing
speed that is a lower limit value at which the storage amount of the yam
in the yarn storage device can be reduced. The deceleration control is
control of reducing the rotation speed of the drive part to a range
25 lower-limit speed equal to or lower than a storage-amount increasing
speed that is an upper limit value at which the storage amount of the
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yam in the yam storage device can be increased. The control part
performs storage-amount decreasing control of increasing the rotation
speed of the drive part to a first set speed that is higher than the range
upper-limit speed after winding for the package is started.
5 [0006] Thus, after rotation of the package is started, the storage amount
that has increased can be quickly reduced.
[0007] In the yarn winding machine according to one aspect of the
present disclosure, one drive part may be provided with respect to each
winding device. In other words, the drive part may rotate only one
10 package. In the yarn winding machine thus configured, rotation of one
package is controlled by one drive part, and thus the storage-amount
decreasing control can be more accurately performed.
[0008] In the yam winding machine according to one aspect of the
present disclosure, the winding device may include a roller configured
15 to rotate in contact with an outer peripheral surface of the package
during winding for the package, and the control part may perform the
storage-amount decreasing control with the roller being in contact with
the package. In the yam winding machine thus configured, contact
pressure is always applied to yarn to be wound around the package, and
20 thus a package without unevenness in tension can be formed.
[0009] In the yam winding machine according to one aspect of the
present disclosure, the first set speed in the storage-amount decreasing
control may be identical regardless of diameter of the package. In the
yarn winding machine thus configured, the storage amount in the yam
25 storage device can be reduced by simple control.
[0010] The yam winding machine according to one aspect of the
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present disclosure may further include a yarn joining device configured
to join the yarn formed by the air spinning device and the yarn wound
by the winding device, and the control part may perform the
storage-amount decreasing control simultaneously with completion or
5 after the completion of the yarn joining operation in the yarn joining
device. The storage amount that has increased due to the stoppage of
winding of the winding device for the yam joining operation can be
quickly reduced.
[0011] In the storage-amount decreasing control of the yam winding
10 machine according to one aspect of the present disclosure, the drive part
may be controlled such that the rotation speed of the drive part is
increased to the first set speed and then the first set speed is maintained.
Even when the rotation speed of the drive part is continued to be
increased and then the rotation speed is reduced, for example, the
15 response speed of the drive part may cause a situation in which the
rotation speed of the drive part cannot be reduced before the stored yarn
runs out. In the yarn winding machine configured as described above,
the rotation speed is prevented from becoming higher than a
predetermined speed (first set speed), and thus a situation in which the
20 storage amount is depleted can be avoided.
[0012] In the storage-amount decreasing control of the yarn winding
machine according to one aspect of the present disclosure, the rotation
speed of the drive part may be increased to the first set speed, and then
the rotation speed of the drive part may be reduced to a second set speed
25 that is a speed at which the storage amount of the yarn in the yarn
storage device can be maintained within the storage range. With this
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configuration, after the storage amount that has increased during
stoppage of winding of the winding device is quickly reduced, variation
in storage amount can be reduced. Consequently, the tension of the
yam wound around a package is kept constant, whereby the quality of
5 the package can be improved.
[0013] The yam winding machine according to one aspect of the
present disclosure may further include a first detecting part configured
to detect the storage amount of the yam stored in the yarn storage
device, and the control part may end the storage-amount decreasing
10 control when having determined based on a detection result of the first
detecting part that the storage amount has become equal to or smaller
than a first predetermined amount that has been set in advance. With
this configuration, the storage-amount decreasing control can be ended
at appropriate timing, and then variation in storage amount can be
15 reduced. Consequently, the tension of the yam wound around a
package can be easily kept constant, whereby the quality of the package
can be improved. Furthermore, a situation in which the storage
amount is depleted can be reliably avoided.
[0014] In the yam winding machine according to one aspect of the
20 present disclosure, after ending the storage-amount decreasing control,
the control part may repeatedly perform first control and second control.
The first control is control of reducing the rotation speed of the drive
part until the rotation speed becomes lower than the second set speed
and reaches the range lower-limit speed and then increasing the rotation
25 speed of the drive part to the second set speed. The second control is
control of increasing the rotation speed of the drive part until the
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rotation speed becomes higher than the second set speed and reaches the
range upper-limit speed and then reducing the rotation speed of the
drive part to the second set speed. In the yarn winding machine thus
configured, the storage amount can be maintained within the storage
5 range.
[0015] The yarn winding machine according to one aspect of the
present disclosure may further include a second detecting part
configured to detect the storage amount of the yarn stored in the yarn
storage device, and the control part may increase the rotation speed of
10 the drive part to the second set speed when having determined, based on
a detection result of the second detecting part, that the storage amount
has become equal to or larger than a second predetermined amount that
is a lower limit value of the storage range, and may reduce the rotation
speed of the drive part to the second set speed when having determined,
15 based on a detection result of the second detecting part, that the storage
amount has become equal to or smaller than a third predetermined
amount that is an upper limit value of the storage range. With this
configuration, the rotation speed of the drive part can be increased or
reduced to the second set speed at appropriate timing, whereby variation
20 in storage amount can be reduced.
[0016] In the first control of the yarn winding machine according to one
aspect of the present disclosure, the rotation speed of the drive part may
be reduced to a predetermined lower-limit speed value, and in the
second control thereof, the rotation speed of the drive part may be
25 increased to a predetermined upper-limit speed value. With this
configuration, the storage amount can be prevented from increasing
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excessively, and also the stored yarn can be prevented from running out.
[0017] In the yarn winding machine according to one aspect of the
present disclosure, the control part may perform stepwise at least one of
reduction of the rotation speed of the drive part in the first control and
5 increase of the rotation speed of the drive part in the second control.
When the reduction of the rotation speed in the first control and the
increase of the rotation speed in the second control are performed
linearly instead of being performed stepwise, differences in speed
between before and after the reduction and between before and after the
10 increase may become excessively large. In this case, slip may occur
between the package and the roller, which may cause a situation in
which the storage amount cannot be controlled accurately. In the yarn
winding machine configured as described above, the reduction of the
rotation speed in the first control or the increase of the rotation speed in
15 the second control is performed stepwise, and thus slippage as described
above can be avoided and the storage amount can be controlled
accurately.
[0018] In the yarn winding machine according to one aspect of the
present disclosure, change of the rotation speed of the drive part from
20 the speed reduced in the first control or the speed increased in the
second control to the second set speed may be performed linearly. In
the yarn winding machine thus configured, after the first control or the
second control is performed, the state of control of the drive part is
quickly shifted to a state in which variation in storage amount has been
25 reduced, and thus variation in storage amount can be reduced.
[0019] The yarn winding machine according to one aspect of the
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present disclosure may further include a drafting device configured to
draft a fiber bundle to be fed to the air spinning device, and the air
spinning device may include: a fiber guiding part configured to guide
the fiber bundle fed from the drafting device; a spinning chamber in
5 which fibers of the fiber bundle guided from the fiber guiding part are
swirled by a swirling flow; and a hollow guide shaft member configured
to guide the fibers swirled in the spinning chamber to outside. With
this configuration, although there is a situation in which yarn is
continuously fed before winding of a package is started in the winding
10 device and the storage amount in the yarn storage device increases, the
storage amount that has increased can be quickly reduced even in this
situation.
[0020] A yarn winding method according to one aspect of the present
disclosure is a yarn winding method performed in a yarn winding
15 machine including: an air spinning device configured to form the yarn
with airflow; a winding device configured to wind the yarn formed by
the air spinning device to form a package; a yarn storage device
disposed between the air spinning device and the winding device and
configured to wind the yarn from the air spinning device around an
20 outer peripheral surface of a yarn storage roller thereby temporarily
storing the yarn; a drive part configured to rotate the package in the
winding device; and a control part configured to maintain a storage
amount of the yarn in the yarn storage device within a predetermined
storage range by repeatedly performing acceleration control and
25 deceleration control. The acceleration control is control of increasing
rotation speed of the drive part to a range upper-limit speed equal to or
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higher than a storage-amount decreasing speed that is a lower limit
value at which the storage amount of the yarn in the yarn storage device
can be reduced. The deceleration control is control of reducing the
rotation speed of the drive part to a range lower-limit speed equal to or
5 lower than a storage-amount increasing speed that is an upper limit
value at which the storage amount of the yarn in the yarn storage device
can be increased. In the yarn winding method, after winding of the
package is started, the rotation speed of the drive part is increased to a
first set speed that is higher than the range upper-limit speed.
10 [0021] By this yarn winding method, in the same manner as in the
above-described yarn winding machine, the storage amount that has
increased can be quickly reduced after rotation of the package is started.
[0022] A yam storage control program according to one aspect of the
present disclosure is a yarn storage control program used in a yarn
15 winding machine including: an air spinning device configured to form
the yarn with airflow; a winding device configured to wind the yarn
formed by the air spinning device to form a package; a yarn storage
device disposed between the air spinning device and the winding device
and configured to wind the yarn from the air spinning device around an
20 outer peripheral surface of a yarn storage roller thereby temporarily
storing the yarn; a drive part configured to rotate the package in the
winding device; and a control part configured to control the drive part.
The yarn storage control program causes the control part to perform a
storage-amount maintaining control of maintaining storage amount of
25 the yarn in the yarn storage device within a predetermined storage range
by repeatedly performing an acceleration control and a deceleration
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control. The acceleration control is a control of increasing the rotation
speed of the drive part to a range upper-limit speed equal to or higher
than a storage-amount decreasing speed that is a lower limit value at
which the storage amount of the yarn in the yarn storage device can be
5 reduced. The deceleration control is a control of reducing the rotation
speed of the drive part to a range lower-limit speed equal to or lower
than a storage-amount increasing speed that is an upper limit value at
which the storage amount of the yarn in the yarn storage device can be
increased. The yarn storage control program also causes the control
10 part to perform a storage-amount decreasing control of increasing
rotation speed of the drive part to a first set speed that is higher than the
range upper-limit speed after winding of the package is started.
[0023] By this yarn winding program, in the same manner as in the
above-described yarn winding machine, the storage amount that has
15 increased can be quickly reduced after rotation of the package is started.
[0024] According to one aspect of the present disclosure, the storage
amount in the yarn storage device that has increased before winding of a
package is started in the winding device can be quickly reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
20 [0025] FIG. 1 is a schematic configuration diagram illustrating a
configuration of a spinning machine according to one embodiment;
FIG. 2 is a sectional view of an air spinning device in FIG. 1;
FIG 3 is a functional block diagram of the air spinning device in
FIG. l;and
25 FIG. 4 is a graph illustrating rotation speed of a motor controlled
by a control part in FIG. 1.
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DETAILED DESCRIPTION
[0026] One embodiment will now be described in detail with reference
to the attached drawings. In the description of the drawings, like or
equivalent elements are designated by like numerals, and duplicate
5 description is omitted.
[0027] As depicted in FIG. 1, a spinning machine (yarn winding
machine) 1 includes a plurality of spinning units (yarn winding units) 2
and a control part 90. The spinning units 2 are aligned in a row.
Each spinning unit 2 drafts a sliver (fiber bundle) S to form a fiber
10 bundle F, twists the fiber bundle F using a swirling flow of air to form
yarn Y, and winds the yarn Y around a bobbin B to form a package P.
The control part 90 controls operation of the spinning machine 1.
[0028] The control part 90 is configured with a machine control device
and a plurality of unit controllers, for example. The machine control
15 device is a host controller of the unit controllers. Each unit controller
is provided for every predetermined number of (one or more) spinning
units 2, and controls operation of each spinning unit 2. In this
embodiment, the control part 90 may be a unit controller. Details of
control of the control part 90 will be described later.
20 [0029] Hereinafter, the upstream side of a sliver S, a fiber bundle F, and
yarn Y in their traveling direction is called "upstream side", and the
downstream side in the traveling direction is called "downstream side".
One side in a horizontal direction orthogonal to a direction in which the
spinning units 2 are aligned (e.g., working passage side) is called "front
25 side", and the other side in the horizontal direction is called "rear side".
The upper side in the vertical direction is called "upper side", and the
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lower side in the vertical direction is called "lower side".
[0030] Each spinning unit 2 includes, in the order from the upstream
side toward the downstream side, a drafting device 3, an air spinning
device 4, a yarn monitoring device 5, a yarn storage device (pull-out
5 device) 6, a yarn joining device 7, and a winding device 20. The
spinning unit 2 further includes a first catching-and-guiding device 8
and a second catching-and-guiding device 9. As one example, the
traveling direction of a sliver S, a fiber bundle F, and yarn Y from the
drafting device 3 to the yam storage device 6 is a direction extending
10 from the front side toward the rear side and is inclined upward with
respect to the horizontal direction. The traveling direction of yam Y
from the yarn storage device 6 to winding device 20 is a direction
extending from the lower side toward the upper side, and is inclined
forward with respect to the vertical direction. In each spinning unit 2,
15 the traveling direction of yam Y is turned at the yam storage device 6.
[0031] The drafting device 3 drafts a sliver S to form a fiber bundle F,
and feeds the fiber bundle F to the air spinning device 4. The drafting
device 3 includes, in the order from the upstream side toward the
downstream side, a back roller pair 31, a third roller pair 32, a middle
20 roller pair 33, and a front roller pair 34. Around the rollers
constituting the middle roller pair 33, apron belts 35 are each wound.
[0032] The air spinning device 4 twists a fiber bundle F from the
drafting device 3 using a swirling flow to form yam Y More
specifically, the air spinning device 4 includes a nozzle block 40 and a
25 hollow guide shaft member 50 as depicted in FIG. 2. In the nozzle
block 40, while a fiber bundle F fed from the drafting device 3 is guided
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to the inside thereof, a swirling flow acts on the fiber bundle F. The
fiber bundle F thus twisted is fed to outside through the hollow guide
shaft member 50. Generation and shutoff of the swirling flow is
controlled by the unit controller.
5 [0033] The nozzle block 40 includes a fiber guiding part 41 and a
swirling flow generating part 42. The fiber guiding part 41 and the
swirling flow generating part 42 may be integrally formed, and may be
separately formed. In the fiber guiding part 41, a guide hole 41a for
guiding a fiber bundle F fed from the drafting device 3 is formed. An
10 end part of the guide hole 41a on the drafting device 3 side is an inlet
41b for a sliver S. In the swirling flow generating part 42, a spinning
chamber 43 and a plurality of first nozzles 44 are formed. In the
spinning chamber 43, a tip 45a of a needle 45 held by the fiber guiding
part 41 is positioned.
15 [0034] In the spinning chamber 43, rear ends of fibers of a fiber bundle
F introduced through the guide hole 41a are swirled by a swirling flow.
In order to form the swirling flow in the spinning chamber 43, air is
injected into the spinning chamber 43 from the first nozzles 44. In the
swirling flow generating part 42, an opening part 42a is formed so as to
20 be continuous with the spinning chamber 43. The opening part 42a is
formed in the shape of a truncated cone that tapers off toward the
upstream side. The needle 45 prevents twisting of the fiber bundle F
from being transmitted to the upstream side of the air spinning device 4.
The needle 45 may be omitted, and a downstream end part of the fiber
25 guiding part 41 may serve as the needle 45 instead.
[0035] An upstream end part 50a of the hollow guide shaft member 50
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is formed in the shape of a truncated cone that tapers off toward the
upstream side, and is disposed inside the opening part 42a with a
clearance therebetween. A flange-like cap 57 is attached to the hollow
guide shaft member 50. The nozzle block 40 is supported by a
5 frame-like holder 46. Due to the cap 57 and the holder 46 coming into
contact with each other, the hollow guide shaft member 50 is positioned
with respect to the spinning chamber 43. Air injected into the spinning
chamber 43 from the first nozzles 44 flows through the clearance
between the upstream end part 50a of the hollow guide shaft member 50
10 and the opening part 42a of the swirling flow generating part 42 and
into a reduced-pressure chamber 47 formed in the holder 46, and is
discharged together with fibers that have not become a portion of the
yarn Y.
[0036] In the hollow guide shaft member 50, a passage 51 and a
15 plurality of second nozzles 54 are formed. The passage 51 guides yarn
Y (fibers swirled in the spinning chamber 43) to outside. For example,
when generation of yam Y is started (restarted), air is injected into the
passage 51 from the second nozzles 54. The passage 51 extends along
the central axis of the hollow guide shaft member 50, and is formed so
20 as to become wider from an inlet 52 toward an outlet 53. Air is
supplied to each second nozzle 54 through an air supply path 56 and an
air flow path 55.
[0037] As depicted in FIG. 1, the yarn monitoring device 5 monitors
information on traveling yarn Y to detect the presence or absence of a
25 yarn defect on the basis of the monitored information. When having
detected a yarn defect, the yarn monitoring device 5 transmits a yarn
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defect detection signal to the control part 90. When having received
the yarn defect detection signal, in order to cut the yarn Y, the control
part 90 causes the drafting device 3 and the air spinning device 4 to stop
operating such that feeding of yam Y is stopped. For example, a cutter
5 may be provided to the yarn monitoring device 5, and the yarn Y may
be cut by operating the cutter.
[0038] The yam storage device 6 is disposed between the air spinning
device 4 and the winding device 20, and includes a yarn storage roller
61 and a yam hooking member 62. The yam storage device 6 winds
10 the yarn Y fed from the air spinning device 4 around the yarn storage
roller 61 thereby temporarily storing the yarn Y.
[0039] The yarn storage roller 61 is rotated by an electric motor (not
depicted). The yarn hooking member 62 is attached to a downstream
end part of the yarn storage roller 61, and is rotatable relative to the yam
15 storage roller 61. Magnetic force acts upon the yam hooking member
62 to interfere with rotation of the yarn hooking member relatively to
the yam storage roller 61. Thus, when a tension equal to or higher
than a predetermined value is not applied to the yarn Y, the yam
hooking member 62 rotates together with the yarn storage roller 61,
20 whereby the yarn Y is wound (stored) around the yam storage roller 61.
When a tension equal to or higher than the predetermined value is
applied to the yam Y, the yam hooking member 62 rotates relatively to
the yam storage roller 61, whereby the yam Y is unwound from the yam
storage roller 61. The yam storage device 6 stores the yam Y in this
25 manner, thereby absorbing variation in tension applied to the yam Y on
the downstream side of the yarn storage device 6, and also stably
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pulling out the yarn Y from the air spinning device 4.
[0040] On the upstream side of the yarn storage device 6, a first guide
63 is disposed. The first guide 63 guides the yarn Y traveling from the
upstream side to the yarn storage device 6. The first guide 63 is
5 movable, and pulls the yarn Y from the air spinning device 4 to the yarn
storage device 6 when yarn joining is performed, for example. On the
downstream side of the yarn storage device 6, a second guide 64, a third
guide 65, and a fourth guide 66 are disposed. The second guide 64 and
the third guide 65 guide the yam Y traveling from the yam storage
10 device 6 to the downstream side. The second guide 64 is movable, and
can guide the yam Y to the third guide 65. The fourth guide 66 is
movable, and hooks the yam Y onto the yam hooking member 62 and
removes the yam Y from the yam hooking member 62.
[0041] When the yam Y has been cut or the yarn Y has broken due to
15 some reason, the yarn joining device 7 joins the yarn Y from the air
spinning device 4 and the yam Y from the package P. The yarn joining
device 7 is a splicer device configured to twist yam ends together using
swirling flow. However, the yarn joining device 7 may be a
mechanical knotter, for example. Each of the first
20 catching-and-guiding device 8 and the second catching-and-guiding
device 9 can swing about its base end part in both directions. When
performing yam joining, the first catching-and-guiding device 8 swings
downward to catch the yam Y from the air spinning device 4 using
suction airflow, and then swings upward to guide the yam Y from the
25 air spinning device 4 to the yarn joining device 7. When performing
yarn joining, the second catching-and-guiding device 9 swings upward
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to catch the yarn Y from the package P using suction airflow, and then
swings downward to guide the yarn Y from the package P to the yarn
joining device 7.
[0042] The winding device 20 winds the yarn Y, which has been pulled
5 out from the air spinning device 4 by the yarn storage device 6, around
a bobbin B to form a package P. The winding device 20 includes a
drum (roller) 23, a pair of bobbin holders 21, a cradle 24, a motor (drive
part) 28 configured to rotate the drum 23. In the present embodiment,
one motor 28 rotates only one package P. In other words, a rotation
10 shaft of the motor 28 is connected to the drum 23, and this one motor 28
rotates this one drum 23 only. One motor 28 is provided with respect
to each of the pair of bobbin holders 21. In the spinning machine 1,
one motor 28 is provided to each spinning unit 2. On the upstream
side of the winding device 20, a fifth guide 26 is disposed. The fifth
15 guide 26 guides the yarn Y traveling from the upstream side toward the
drum 23.
[0043] The drum 23 rotates the bobbin B while making contact with a
bobbin B. When the yarn Y is being wound around the bobbin B, the
drum 23 rotates while being in contact with an outer peripheral surface
20 of the package P, thereby rotating the package P. On a surface of the
drum 23, a traverse groove (not depicted) is formed. By this traverse
groove, the yarn Y is traversed when the yarn Y is wound around the
bobbin B. Herein, instead of forming the traverse groove on the
surface of the drum 23, the yarn Y may be traversed by an additionally
25 provided traversing device when the yarn Y is wound around the bobbin
B.
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[0044] The cradle 24 is provided so as to be swingable about a
swinging axis L2 in both directions, and can absorb an increase in
diameter of the package P when the yam Y is wound around the bobbin
B. The cradle 24 is provided with the pair of bobbin holders 21, which
5 rotatably support both end parts of the bobbin B.
[0045] A yarn detection sensor (a first detecting part and a second
detecting part) 61 detects the storage amount of yarn Y stored in the
yarn storage device 6. The yarn detection sensor 61 can detect an
upper-limit storage amount (a first predetermined amount and a third
10 predetermined amount) that is an upper limit value of an appropriate
storage amount (storage range) and a lower-limit storage amount
(second predetermined amount) that is a lower limit value of the
appropriate storage amount. The yarn detection sensor 61 is disposed
so as to face an outer peripheral surface of the yarn storage roller 61.
15 [0046] The control part 90 is an electronic control unit including a
central processing unit (CPU), a read only memory (ROM), and a
random access memory (RAM). The control part 90 loads a program
(yam storage control program) stored in the ROM into the RAM, and
causes the CPU to execute the program, thereby performing various
20 controls. For example, the control part 90 mainly uses information
input from the yarn detection sensor 67 to control the motor 28 of the
winding device 20, the drafting device 3, the air spinning device 4, and
the yarn joining device 7 as depicted in FIG. 3, thereby performing
storage-amount decreasing control C of quickly reducing the storage
25 amount in the yarn storage device 6 that has increased before winding
of a package P in the winding device 20 is started.
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[0047] The yarn storage control program causes the control part 90 to
perform a storage-amount maintaining control and a storage-amount
decreasing control. The storage-amount maintaining control is a
control of maintaining the storage amount of the yarn Y in the yarn
5 storage device 6 within a predetermined storage range by repeatedly
performing an acceleration control and a deceleration control. The
acceleration control is a control of increasing the rotation speed of the
motor 28 to a fourth set speed (range upper-limit speed) V5 equal to or
higher than a storage-amount decreasing speed VI that is a lower limit
10 value at which the storage amount of the yarn Y in the yarn storage
device 6 can be reduced. The deceleration control is a control of
reducing the rotation speed of the motor 28 to a third set speed (range
lower-limit speed) V4 equal to or lower than a storage-amount
increasing speed V3 that is an upper limit value at which the storage
15 amount of the yarn Y in the yarn storage device 6 can be increased.
The storage-amount decreasing control is a control of increasing the
rotation speed of the motor 28 to a first set speed V2 that is higher than
the fourth set speed V5 after winding of the package P is started. This
yarn storage control program may be stored in a non-transitory
20 recording medium that can be read by an electronic control part
(computer). The non-transitory recording medium may, for example,
include a compact disc, a floppy disk, a hard disk, a magneto-optical
disk, digital video disc, magnetic tape and semiconductor memory.
[0048] The following describes in detail the storage-amount decreasing
25 control C to be performed by the control part 90 with reference to FIG.
4. A second set speed V0, the storage-amount decreasing speed VI,
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the storage-amount increasing speed V3, the third set speed V4, and the
fourth set speed V5 are defined as follows.
Second set speed VO: a rotation speed of the motor 28 that is set
in advance as a speed at which variation in storage amount in the yarn
5 storage device 6 can be reduced
Storage-amount decreasing speed VI: a rotation speed of the
motor 28 that is set in advance as a speed that is higher than the second
set speed VO and has a lower-limit at which the storage amount in the
yarn storage device 6 can be reduced
10 Storage-amount increasing speed V3: a rotation speed of the
motor 28 that is set in advance as a speed that is lower than the second
set speed VO and has an upper-limit at which the storage amount in the
yarn storage device 6 can be increased
Third set speed V4 (range lower-limit speed): a rotation speed of
15 the motor 28 that is equal to or lower than the storage-amount
increasing speed V3 (the third set speed V4 = the storage-amount
increasing speed V3 in the present embodiment)
Fourth set speed V5 (range upper-limit speed): a rotation speed
of the motor 28 that is equal to or higher than the storage-amount
20 decreasing speed VI (the fourth set speed V5 = the storage-amount
decreasing speed VI in the present embodiment)
[0049] As depicted in FIG 4, immediately after winding of the package
P is started (simultaneously with this start), the control part 90 controls
the motor 28 to perform the storage-amount decreasing control C of
25 increasing the rotation speed of the motor 28 to the first set speed V2
that is a speed higher than the storage-amount decreasing speed VI.
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The control part 90 performs the storage-amount decreasing control C
simultaneously with completion or after the completion of yarn joining
operation in the yarn joining device 7. The storage-amount decreasing
control C may be performed at the time when winding is started after an
5 empty bobbin B has been set on the winding device 20 by a doffer (not
depicted) and during a predetermined period of time after this start of
winding. The control part 90 performs the storage-amount decreasing
control C with the drum 23 being in contact with the package P. The
first set speed V2 in the storage-amount decreasing control C is
10 identical regardless of the diameter of the package P. In other words,
the motor 28 has sufficient torque with which the package P can be
rotated at the first set speed V2 even when the diameter of the package
P increases.
[0050] After the rotation speed of the motor 28 is increased to the first
15 set speed V2, the control part 90 controls the motor 28 such that the first
set speed V2 is maintained. When having determined that the storage
amount has become equal to or lower than the upper-limit storage
amount (first predetermined amount) on the basis of detection of the
yarn Y by the yarn detection sensor 67, the control part 90 controls the
20 motor 28 such that the rotation speed is reduced from the first set speed
V2 to the second set speed V0 to end the storage-amount decreasing
control C. Change from the first set speed V2 to the second set speed
V0 is performed linearly instead of being performed stepwise.
[0051] After performing the storage-amount decreasing control C, the
25 control part 90 controls the motor 28 to perform storage-amount
maintaining control CO of maintaining the storage amount in the yarn
21
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storage device 6 within a predetermined storage range. In the
storage-amount maintaining control CO, the control part 90 controls the
motor 28 to perform storage-amount control CI and a third control C3.
The storage-amount control CI is control of repeating first control Cll
5 and second control C12. The third control C3 is control of controlling
the rotation speed of the motor 28 such that the second set speed VO is
maintained.
[0052] The first control Cll is control of reducing the rotation speed of
the motor 28 to the third set speed V4 that is a speed equal to or lower
10 than the storage-amount increasing speed V3 (the storage-amount
increasing speed V3 and the third set speed V4 are the same in the
present embodiment) and then, if it is determined that the storage
amount has become equal to or larger than the upper-limit storage
amount (third storage amount) on the basis of detection of the yarn Y by
15 the yarn detection sensor 67, increasing the rotation speed of the motor
28 to the second set speed VO. In the present embodiment, an example
has been described in which the third set speed V4 is set to the same
speed as the storage-amount increasing speed V3. However, the third
set speed V4 may be set to a speed lower than the storage-amount
20 increasing speed V3.
[0053] The control part 90 reduces stepwise the rotation speed of the
motor 28 in the first control Cll until the storage amount becomes
equal to or larger than the upper-limit storage amount (third storage
amount). This stepwise reduction of the rotation speed of the motor 28
25 in the first control Cll is performed until the rotation speed reaches the
third set speed V4 that is a predetermined lower-limit speed value. In
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other words, in the first control Cll, when the rotation speed of the
motor 28 has reached the third set speed V4, this third set speed V4 is
maintained. The rotation speed of the motor 28, which has been
reduced to the third set speed V4 in the first control Cll, is increased
5 linearly to the second set speed VO, instead of being increased stepwise.
Accordingly, the storage amount is prevented from excessively
increasing.
[0054] The second control C12 is control of increasing the rotation
speed of the motor 28 to the fourth set speed V5 equal to or higher than
10 the storage-amount decreasing speed VI (the storage-amount
decreasing speed VI and the fourth set speed V5 are the same in the
present embodiment) and then, if it is determined that the storage
amount has become equal to or smaller than the lower-limit storage
amount (second storage amount) on the basis of detection of the yarn Y
15 by the yarn detection sensor 67, reducing the rotation speed of the
motor 28 to the second set speed VO. In the present embodiment, an
example has been described in which the fourth set speed V5 is set to
the same speed as the storage-amount decreasing speed VI. However,
the fourth set speed V5 may be set to a speed higher than the
20 storage-amount decreasing speed VI and lower than the first set speed
V2.
[0055] The control part 90 increases stepwise the rotation speed of the
motor 28 in the second control C12 until the storage amount becomes
equal to or smaller than the lower-limit storage amount (second storage
25 amount). This stepwise increase of the rotation speed of the motor 28
in the second control C12 is performed until the rotation speed reaches
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the fourth set speed V5 that is a predetermined upper-limit speed value.
In other words, in the second control CI2, when the rotation speed of
the motor 28 has reached the fourth set speed V5, this fourth set speed
V5 is maintained. The rotation speed of the motor 28, which has been
5 increased to the fourth set speed V5 in the second control C12, is
changed linearly to the second set speed VO, instead of being changed
stepwise. Accordingly, the storage amount is prevented from
excessively decreasing.
[0056] Although the control part 90 is performing the third control C3
10 between the storage-amount decreasing control C and the
storage-amount control CI, this third control C3 may be omitted.
Although the control part 90 is performing the third control C3 between
the first control Cll and the second control CI2, this third control C3
may be omitted.
15 [0057] When performing the third control C3 between the
storage-amount decreasing control C and the storage-amount control
CI, this third control C3 may be performed within a period of time that
is short as possible. In other words, shifting from the storage-amount
decreasing control C to the first control Cll in the storage-amount
20 control CI may be performed as quickly as possible. In this case, even
when the second set speed V0 becomes higher than the speed at which
the yarn Y is fed from the air spinning device 4, the storage amount of
the yarn Y is increased by starting the first control Cll, which can
thereby reduce the possibility that the storage amount in the yarn
25 storage device 6 becomes zero. Consequently, a situation in which the
storage amount becomes zero and the spinning unit 2 stops can be
24
FP18-0682-00IN-MRT
avoided. Shifting from the first control Cll to the second control C12
in the storage-amount control CI does not have to be performed as
quickly as described above.
[0058] The following describes functional effects of the spinning
5 machine 1 according to the embodiment described above. In the
spinning machine 1 of the embodiment above, by controlling the motor
28 configured to drive the drum 23 for rotating a package P, the
storage-amount decreasing control C is performed, and thus the storage
amount in the yarn storage device 6 that has increased before winding
10 of the package P in the winding device 20 is started can be quickly
reduced.
[0059] In the spinning machine 1 according to the embodiment, one
motor 28 is provided for each winding device 20 provided to each of the
spinning units 2. With this configuration, rotation of one package P is
15 controlled by one motor 28, and thus winding control for the package P
can be more accurately performed.
[0060] In the spinning machine 1 according to the embodiment, the
control part 90 performs the storage-amount decreasing control C with
the drum 23 being in contact with a package P. With this
20 configuration, contact pressure is always applied to the yarn Y to be
wound around the package P, and thus a good-quality package P without
unevenness in tension can be formed.
[0061] In the spinning machine 1 according to the embodiment, the
control part 90 performs the storage-amount decreasing control C
25 simultaneously with completion of yarn joining operation in the yarn
joining device 7. Thus, the storage amount in the yarn storage device
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FP18-0682-00IN-MRT
6 that has increased due to the stoppage of winding of the winding
device 20 for yam joining operation can be quickly reduced.
[0062] In the storage-amount decreasing control C of the spinning
machine 1 according to the embodiment, as depicted in FIG. 4, the
5 motor 28 is controlled such that the rotation speed of the motor 28 is
increased to the first set speed V2 and then the first set speed V2 is
maintained. This solves the problem that the rotation speed cannot be
reduced sufficiently due to, for example, the response speed of the
motor 28 before the storage amount of the yarn Y runs out.
10 Consequently, the storage amount can be prevented from running out.
[0063] In the spinning machine 1 according to the embodiment, the
control part 90 ends the storage-amount decreasing control C when
having determined that the storage amount has become equal to or
smaller than the lower-limit storage amount on the basis of detection of
15 the yam Y by the yam detection sensor 67. Thus, the storage-amount
decreasing control C can be ended at an appropriate timing, and then
variation in storage amount in the yarn storage device 6 can be reduced
thereafter. Consequently, the tension of the yam Y wound around a
package P can be easily kept constant, whereby the quality of the
20 package P can be improved. Furthermore, a situation in which the
storage amount runs out in the yam storage device 6 can be reliably
avoided.
[0064] If the winding speed of the yam Y in the winding device 20 can
be matched to a feeding speed at which the air spinning device 4 feeds
25 yam Y, the storage amount in the yam storage device 6 can be made
constant. Thus, in the spinning machine 1 according to the
26
FP18-0682-00IN-MRT
embodiment, the second set speed VO that is predetermined as a speed
at which variation in storage amount in the yarn storage device 6 can be
reduced is matched to the feeding speed at which the yarn Y is fed from
the air spinning device 4. However, a difference in speed may arise
5 between the rotation speed of the motor 28 and the actual winding speed
of a package P depending on various conditions, and the feeding speed
may vary, and accordingly a difference in speed may arise between the
second set speed VO and the feeding speed. In this case, even when
the third control C3 of controlling the rotation speed of the motor 28
10 such that the rotation speed becomes the second set speed VO is
performed, the storage amount in the yarn storage device 6 cannot be
maintained within a predetermined storage range. The control part 90
of the spinning machine 1 according to the embodiment controls the
motor 28 to perform the storage-amount control CI (storage-amount
15 maintaining control CO) of repeating the first control Cll and the
second control CI2, whereby the storage amount can be maintained
within a predetermined storage range even if there is a difference in
speed between the second set speed VO and the feeding speed.
[0065] In the spinning machine 1 according to the embodiment, the
20 control part 90 increases or reduces the rotation speed of the motor 28
on the basis of detection by the yarn detection section 67 of the
lower-limit storage amount and the upper-limit storage amount which
are an appropriate storage amount. With this configuration, the
rotation speed of the motor 28 can be increased or reduced to the second
25 set speed V0 at an appropriate timing, whereby variation in storage
amount in the yarn storage device 6 can be reduced.
27
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[0066] In the spinning machine 1 according to the embodiment,
limitations are imposed on the first control Cll such that the rotation
speed of the motor 28 can be reduced only to the predetermined
lower-limit speed value, and limitations are imposed on the second
5 control CI2 such that the rotation speed of the motor 28 can be
increased only to the predetermined upper-limit speed value. Thus, a
situation in which the storage amount in the yarn storage device 6
excessively increases can be avoided, and also a situation in which the
storage amount in the yarn storage device 6 runs out can be avoided.
10 [0067] In the spinning machine 1 according to the embodiment, the
control part 90 performs stepwise at least one of a reduction of the
rotation speed of the motor 28 in the first control Cll, and an increase
of the rotation speed of the motor 28 in the second control C12.
Consequently, slippage between a package P and the drum 23 can be
15 avoided in the winding device 20, and thus the storage amount in the
yarn storage device 6 can be controlled accurately. Herein, this control
does not have to be performed stepwise, and the reduction or increase in
the rotation speed of the motor 28 may be performed linearly.
[0068] In the spinning machine 1 according to the embodiment, change
20 of the rotation speed of the motor 28 to the second set speed V0 from
the third set speed V4, which is the rotation speed that has been reduced
in the first control Cll, or from the fourth set speed V5, which is the
rotation speed that has been increased in the second control CI2, is
performed linearly instead of being performed stepwise.
25 Consequently, the state of control of the motor 28 is quickly shifted to a
state in which variation in storage amount in the yarn storage device 6 is
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FP18-0682-00IN-MRT
decreased, and thus variation in storage amount in the yarn storage
device 6 can be reduced.
[0069] In the spinning machine 1 according to the embodiment, the
motor 28 has sufficient torque with which a package P can be rotated at
5 the first set speed V2 even when the diameter of the package P has
increased so that the first set speed V2 in the storage-amount decreasing
control C is identical regardless of the diameter of the package P. This
eliminates the need of performing winding control of the package P in
consideration of weight and inertia, for example, depending on the
10 diameter of the package P, and thus the storage amount in the yarn
storage device 6 can be reduced by simple control.
[0070] By the yarn winding method performed in the spinning machine
1, after winding of the package P is started, the rotation speed of the
motor 28 is increased to the first set speed V2 that is higher than the
15 storage-amount decreasing speed VI at which the storage amount of
yarn Y in the yarn storage device 6 can be reduced. By this winding
method, the storage amount in the yarn storage device 6 that has
increased before winding of the package P is started can be quickly
reduced.
20 [0071] Although an embodiment according to one aspect of the present
disclosure has been described above, one aspect of the present
disclosure is not limited to the embodiment above.
[0072] In the embodiment, an example has been described in which the
winding device 20 is of a type in which the drum 23 is rotationally
25 driven, whereby the bobbin B being in contact with the drum 23 is
rotated accompanying the rotation of the drum 23. One aspect of the
29
FP18-0682-00IN-MRT
present disclosure is not limited to this example, and the winding device
may be of a type in which the bobbin B is rotationally driven, whereby
the drum 23 being in contact with the bobbin B is rotated depending on
the rotation of the bobbin B. In this case, the motor 28 rotationally
5 drives the bobbin B.
[0073] In the embodiment, an example has been described in which
rotation of the drum 23 is controlled in order to perform the
storage-amount decreasing control C and the storage-amount control CI
(storage-amount maintaining control CO). Instead of this example, in
10 one aspect of the present disclosure, a motor (not depicted) configured
to drive a reversing roller included in a work carriage (not depicted),
which is movable along a direction in which the spinning units 2 are
aligned, may be controlled. The reversing roller is a roller configured
to rotate a package P in a direction (yarn unwinding direction) opposite
15 to a direction in which a package P supported by the winding device 20
is rotated by the drum 23 while being in contact therewith. The
control part 90 may control the motor so as to cause the reversing roller
to rotate in a direction opposite to the yarn unwinding direction (yarn
winding direction of the package P), thereby performing the
20 storage-amount decreasing control C and the storage-amount control CI
(storage-amount maintaining control CO). In this case, even when
drums 23 in a plurality of winding devices 20 included in the spinning
machine 1 are configured to be driven all together, by lifting up a
package P from a drum 23 and using the reversing roller of the work
25 carriage to rotate the package P, storage-amount decreasing control C
and storage-amount control CI (storage-amount maintaining control
30
FP18-0682-00IN-MRT
CO) that are similar to those in the embodiment can be performed.
[0074] In the embodiment, an example has been described in which the
timing of reducing the rotation speed from the first set speed V2 to the
second set speed V0 in the storage-amount decreasing control C is
5 controlled based on detection of the yam Y by the yarn detection sensor
67. One aspect of the present disclosure is not limited to this example.
For example, if control duration from the start of winding of a package
P to the timing of reducing the rotation speed is set in advance based on
empirical values, controls similar to those in the embodiment can be
10 performed without providing the yarn detection sensor 67. If control
durations are set in advance also for the timing of increasing the rotation
speed from the third set speed V4 to the second set speed V0 in the
storage-amount control CI and the timing of reducing the rotation speed
from the fourth set speed V5 to the second set speed V0 in the
15 storage-amount control CI, controls similar to those in the embodiment
can be performed without providing the yam detection sensor 67.
[0075] Instead of the configuration in which one yam detection sensor
67 detects the lower-limit storage amount that is a lower limit value of
an appropriate storage amount and the upper-limit storage amount that
20 is an upper limit value of the appropriate storage amount, for example,
two yarn detection sensors 67 may be provided such that one yarn
detection sensor 67 detects the lower-limit storage amount and the other
yarn detection sensor 67 detects the upper-limit storage amount.
[0076] Instead of the control of repeatedly increasing and reducing the
25 rotation speed on the basis of two thresholds (the lower-limit storage
amount and the upper-limit storage amount) detected by one or two
31
FP18-0682-00IN-MRT
yarn detection sensors 67, the rotation speed may be repeatedly
increased and reduced, for example, on the basis of detection results of
a yarn detection sensor 67 configured to detect one threshold, that is,
whether a predetermined storage amount is stored. For example, in a
5 case in which the yarn detection sensor 67 is provided so as to detect the
lower-limit storage amount, the control part 90 reduces the rotation
speed of the motor 28 when yarn Y is not detected by the yarn detection
sensor 67, and increases the rotation speed of the motor 28 when yarn Y
is detected by the yarn detection sensor 67.
10 [0077] The control part 90 may control the rotation speed of the motor
28 such that the rotation speed of the motor 28 is increased to the first
set speed V2 and then, without being maintained at the first set speed
V2, is continued to be increased beyond the first set speed V2, and then
is reduced to the second set speed V0. In this case, by controlling the
15 rotation speed of the motor 28 so as not to exceed the storage-amount
decreasing speed VI significantly, a situation in which the storage
amount becomes zero can be avoided.
[0078] Changes of the rotation speed of the motor 28 from the first set
speed V2 to the second set speed V0 in the storage-amount decreasing
20 control C, from the third set speed V4 to the second set speed V0 in the
first control Cll, and from the fourth set speed V5 to the second set
speed V0 in the second control C12 may be controls that are performed
stepwise instead of controls that are performed linearly.
[0079] An example has been described in which, in the first control
25 Cll, the rotation speed of the motor 28 is reduced stepwise to the third
set speed V4 that is a predetermined lower-limit speed value.
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FP18-0682-00IN-MRT
However, this reduction of the rotation speed may be stopped when the
storage amount reaches the upper-limit storage amount (third storage
amount). In other words, the third set speed V4 does not have to be
the same. Similarly, an example has been described in which, in the
5 second control CI2, the rotation speed of the motor 28 is increased to
the fourth set speed V5 that is a predetermined upper-limit speed value.
However, this increase of the rotation speed may be stopped when the
storage amount reaches the lower-limit storage amount (second storage
amount). In other words, the fourth set speed V5 does not have to be
10 the same. It should be noted that the fourth set speed V5 is a speed
lower than the first set speed V2.
[0080] The stepwise reduction of the rotation speed in the first control
Cll does not necessarily have to be performed in three steps, and may
be performed in one step, two steps, or four or more steps. The
15 stepwise increase of the rotation speed in the second control C12 does
not necessarily have to be performed in three steps, and may be
performed in one step, two steps, or four or more steps.
[0081] In each spinning unit 2, the traveling direction of the yam Y is
turned at the yarn storage device 6. However, the traveling direction
20 of the yarn Y does not have to be turned at the yarn storage device 6.
In order to pull out the yam Y from the air spinning device 4, a delivery
roller and a nip roller may be disposed between the air spinning device
4 and the yam storage device 6. The yarn monitoring device 5 may be
disposed between the yam storage device 6 and the winding device 20.
25 [0082] A yam winding machine according to the present disclosure
includes: an air spinning device configured to form yarn with airflow; a
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FP18-0682-00IN-MRT
winding device configured to wind the yarn formed by the air spinning
device to form a package; a yarn storage device disposed between the
air spinning device and the winding device and configured to
temporarily store the yarn from the air spinning device and to feed the
5 yarn to the winding device; a drive part configured to rotate the package
in the winding device; and a control part configured to perform
storage-amount decreasing control of increasing rotation speed of the
drive part, by controlling the drive part, to a first set speed equal to or
higher than a storage-amount decreasing speed at which the storage
10 amount of the yarn in the yarn storage device can reduced after winding
of the package is started.
[0083] A yarn winding method according to present disclosure is a yarn
winding method performed in a yarn winding machine including: an air
spinning device configured to form yarn with airflow; a winding device
15 configured to wind the yarn formed by the air spinning device to form a
package; a yarn storage device disposed between the air spinning device
and the winding device and configured to temporarily store the yarn
from the air spinning device and to feed the yarn to the winding device;
and a drive part configured to rotate the package in the winding device.
20 The yarn winding method includes increasing the rotation speed of the
drive part to a first set speed equal to or higher than a storage-amount
decreasing speed at which the storage amount of the yarn in the yarn
storage device can be reduced after winding for the package is started.
[0084] At least some of the embodiments disclosed above may be
25 optionally combined.

We claim:
1. A yarn winding machine (1) comprising:
an air spinning device (4) configured to form a yarn (Y) with
5 airflow;
a winding device (20) configured to wind the yarn (Y) formed
by the air spinning device (4) to form a package (P);
a yarn storage device (6) disposed between the air spinning
device (4) and the winding device (20) and configured to wind the yarn
10 (Y) from the air spinning device (4) around an outer peripheral surface
of a yarn storage roller (61) thereby temporarily storing the yam (Y);
a drive part (28) configured to rotate the package (P) in the
winding device (20); and
a control part (90) configured to perform storage-amount
15 maintaining control (CO) of maintaining a storage amount of the yarn
(Y) in the yarn storage device (6) within a predetermined storage range
by repeatedly performing acceleration control and deceleration control,
the acceleration control being increasing rotation speed of the drive part
(28) to a range upper-limit speed (V5) equal to or higher than a
20 storage-amount decreasing speed (VI) that is a lower limit value at
which the storage amount of the yam (Y) in the yarn storage device (6)
can be reduced, the deceleration control being reducing the rotation
speed of the drive part (28) to a range lower-limit speed (V4) equal to or
lower than a storage-amount increasing speed (V3) that is an upper limit
25 value at which the storage amount of the yarn (Y) in the yam storage
device (6) can be increased, characterized in that
35
FP18-0682-00IN-MRT
the control part (90) is configured to perform storage-amount
decreasing control (C) of increasing the rotation speed of the drive part
(28) to a first set speed (V2) that is higher than the range upper-limit
speed (V5) after winding of the package (P) is started.
5
2. The yarn winding machine (1) according to claim 1, wherein,
one drive part (28) is provided with respect to each winding device (20).
3. The yarn winding machine (1) according to claim 1 or 2,
10 wherein
the winding device (20) includes a roller (23) configured to
rotate while being in contact with an outer peripheral surface of the
package (P) during winding of the package (P), and
the control part (90) is configured to perform the
15 storage-amount decreasing control (C) with the roller (23) being in
contact with the package (P).
4. The yarn winding machine (1) according to any one of claims 1
to 3, wherein
20 the first set speed (V2) in the storage-amount decreasing control
(C) is identical regardless of diameter of the package (P).
5. The yam winding machine (1) according to any one of claims 1
to 4 further comprising a yarn joining device (7) configured to join the
25 yarn (Y) formed by the air spinning device (4) and the yarn (Y) wound
by the winding device (20), wherein
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the control part (90) performs the storage-amount decreasing
control (C) simultaneously with completion or after the completion of
yarn joining operation in the yarn joining device (7).
5 6. The yarn winding machine (1) according to any one of claims 1
to 5, wherein, in the storage-amount decreasing control (C), the drive
part (28) is controlled such that the rotation speed of the drive part (28)
is increased to the first set speed (V2) and then the first set speed (V2) is
maintained.
10
7. The yarn winding machine (1) according to any one of claims 1
to 6, wherein, in the storage-amount decreasing control (C), the rotation
speed of the drive part (28) is increased to the first set speed (V2), and
then the rotation speed of the drive part (28) is reduced to a second set
15 speed (V0) that is a speed at which a storage amount of the yarn (Y) in
the yarn storage device (6) can be maintained within the storage range.
8. The yarn winding machine (1) according to claim 7 further
comprising a first detecting part (67) configured to detect the storage
20 amount of the yarn (Y) stored in the yarn storage device (6), wherein
the control part (90) is configured to end the storage-amount
decreasing control (C) when having determined based on a detection
result of the first detecting part (67) that the storage amount has become
equal to or smaller than a first predetermined amount that has been set
25 in advance.
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9. The yarn winding machine (1) according to claim 7 or 8,
wherein, after ending the storage-amount decreasing control (C), the
control part (90) repeatedly performs first control (Cll) and second
control (CI2), the first control (Cll) being control of reducing the
5 rotation speed of the drive part (28) until the rotation speed becomes
lower than the second set speed (VO) and reaches the range lower-limit
speed (V4) and then increasing the rotation speed of the drive part (28)
to the second set speed (VO), the second control (CI2) being control of
increasing the rotation speed of the drive part (28) until the rotation
10 speed becomes higher than the second set speed (VO) and reaches the
range upper-limit speed (V5) and then reducing the rotation speed of the
drive part (28) to the second set speed (VO).
10. The yarn winding machine (1) according to claim 9 further
15 comprising a second detecting part (67) configured to detect the storage
amount of the yarn (Y) stored in the yarn storage device (6), wherein
the control part (90) is configured to increase the rotation speed
of the drive part (28) to the second set speed (VO) when having
determined, based on a detection result of the second detecting part
20 (67), that the storage amount has become equal to or larger than a
second predetermined amount that is a lower limit value of the storage
range, and to reduce the rotation speed of the drive part (28) to the
second set speed (V0) when having determined, based on a detection
result of the second detecting part (67), that the storage amount has
25 become equal to or smaller than a third predetermined amount that is an
upper limit value of the storage range.
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11. The yarn winding machine (1) according to claim 9 or 10,
wherein
in the first control (CI 1), the rotation speed of the drive part (28)
5 is reduced to a predetermined lower-limit speed value (V4), and
in the second control (CI2), the rotation speed of the drive part
(28) is increased to a predetermined upper-limit speed value (V5).
12. The yarn winding machine (1) according to any one of claims 9
10 to 11, wherein the control part (90) is configured to perform stepwise at
least one of reduction of the rotation speed of the drive part (28) in the
first control (Cll) and increase of the rotation speed of the drive part
(28) in the second control (C12).
15 13. The yarn winding machine (1) according to any one of claims 9
to 12, wherein change of the rotation speed of the drive part (28) from
the speed reduced in the first control (Cll) to the second set speed (V0)
or change of the rotation speed of the drive part (28) from the speed
increased in the second control (CI2) to the second set speed (V0) is
20 performed linearly.
14. The yarn winding machine (1) according to any one of claims 1
to 13 further comprising a drafting device (3) configured to draft a fiber
bundle (F) to be fed to the air spinning device (4), wherein
25 the air spinning device (4) includes:
a fiber guiding part (41) configured to guide the fiber
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bundle (F) fed from the drafting device (3);
a spinning chamber (43) in which fibers of the fiber
bundle (F) guided by the fiber guidmg part (41) are swirled by a
swirling flow; and
5 a hollow guide shaft member (50) configured to guide
the fibers swirled in the spinning chamber (43) to outside.
15. Ayarn winding method with the following steps:
forming yarn (Y) with airflow;
10 winding the yarn (Y) formed with the airflow around an outer
peripheral surface of a yarn storage roller (61) of a yarn storage device
(6) thereby temporarily storing the yam (Y);
winding the yarn (Y) from the yarn storage device (6) to form a
package (P) by rotating the package (P) by a drive part (28); and
15 maintaining a storage amount of the yarn (Y) in the yarn storage
device (6) within a predetermined storage range by repeatedly
performing an acceleration control and a deceleration control, the
acceleration control being increasing the rotation speed of the drive part
(28) to a range upper-limit speed (V5) equal to or higher than a
20 storage-amount decreasing speed (VI) that is a lower limit value at
which the storage amount of the yam (Y) in the yarn storage device (6)
can be reduced, the deceleration control being reducing the rotation
speed of the drive part (28) to a range lower-limit speed (V4) equal to or
lower than a storage-amount increasing speed (V3) that is an upper limit
25 value at which the storage amount of the yarn (Y) in the yam storage
device (6) can be increased,
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characterized by increasing the rotation speed of the drive part
(28) to a first set speed (V2) that is higher than the range upper-limit
speed (V5) after winding of the package (P) is started.
5 16. A yarn storage control program used in a yarn winding machine
(1) including; an air spinning device (4) configured to form yarn (Y)
with airflow; a winding device (20) configured to wind the yarn (Y)
formed by the air spinning device (4) to form a package (P); a yarn
storage device (6) disposed between the air spinning device (4) and the
10 winding device (20) and configured to wind the yarn (Y) from the air
spinning device (4) around an outer peripheral surface of a yarn storage
roller (61) thereby temporarily storing the yarn (Y); a drive part (28)
configured to rotate the package (P) in the winding device (20); and a
control part (90) configured to control the drive part (28), the yarn
15 storage control program causing the control part (90)to perform:
a storage-amount maintaining control of maintaining a storage
amount of the yarn (Y) in the yarn storage device (6) within a
predetermined storage range by repeatedly performing an acceleration
control and a deceleration control, the acceleration control being
20 increasing the rotation speed of the drive part (28) to a range upper-limit
speed (V5) equal to or higher than a storage-amount decreasing speed
(VI) that is a lower limit value at which the storage amount of the yarn
(Y) in the yarn storage device (6) can be reduced, the deceleration
control being reducing the rotation speed of the drive part (28) to a
25 range lower-limit speed equal to or lower than a storage-amount
increasing speed (V3) that is an upper limit value at which the storage
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amount of the yarn. (Y) in the yarn storage device (6) can be increased;
characterized by
a storage-amount decreasing control of increasing rotation speed
of the drive part (28) to a first set speed (V2) that is higher than the
5 range upper-limit speed (V5) after winding of the package (P) is started.