YARN WINDING MACHINE
BACKGROUND OF THE INVENTION
1. Field of the Invention
5 The present invention relates to a yarn winding
machine.
2. Description of the Related Art
As a conventional yarn winding machine, a yarn
10 winding machine described in Japanese Unexamined Patent
Publication No. 2012-218922, for example, is known. In the
yarn winding machine described in Japanese Unexamined
Patent Publication No. 2012-218922, when a yarn is cut
during a winding operation of the yarn, a package is
15 separated from a touch roller by a moving section and the
package is rotated in a direction opposite to a winding
direction by a package driving section. A yarn end of a
yarn which continues to the package (yarn end of the
package) is then caught by a yarn end catching section and
20 handed to a splicer device, and this yarn end is connected
to a yarn end of a yarn from a yarn supplying bobbin.
In the yarn winding machine described above, when the
yarn is cut, the yarn end of the package sometimes attaches
to the package depending on a material of the yarn and/or
25 an amount of fluff and the like, for example. As a result,
the yarn end is difficult to be caught by the yarn end
catching section, and furthermore, a pull-out rate of the
yarn end may be lowered.
30 BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide
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a yarn winding machine capable of detaching a yarn end from
a package.
A yarn winding machine of the present invention
includes a holding section adapted to hold a package; a
5 touch roller adapted to make contact with a surface of the
package held by the holding section; a moving section
adapted to move the package between a position in which the
package makes contact with the touch roller and a position
in which the package is separated from the touch roller;
10 and a package driving section adapted to rotatably drive
the package, wherein the package driving section carries
out a forward rotation of rotating the package in a winding
direction for a set period in a separated state in which
the package having a yarn end is separated from the touch
15 roller by the moving section.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of an automatic winder
including a winding unit according to one embodiment of the
20 present invention;
FIG. 2 is a schematic view and a block diagram
illustrating a schematic configuration of the winding unit;
FIG. 3 is a left side view illustrating the vicinity
of a traverse device of the winding unit in an enlarged
25 manner;
FIG. 4 is a right side view illustrating the vicinity
of a cradle of the winding unit in an enlarged manner;
FIG. 5 is a left side view illustrating a package that
moves to a non-contacting position and a contacting
30 position;
FIG. 6 is a chart diagram illustrating one example
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of an operation of the winding unit; and
FIG. 7 is a chart diagram illustrating another
example of the operation of the winding unit.
5 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Preferred embodiments of the present invention will
be hereinafter described in detail with reference to the
drawings. In the drawings, the same reference numerals are
denoted for the same or corresponding portions, and
10 redundant description will be omitted.
First, an overall configuration of an automatic
winder 1 including a winding unit (yarn winding machine)
10 according to the present embodiment will be described
with reference to FIG. 1. "Upstream" and "downstream"
15 respectively refer to upstream and downstream in a
travelling direction of a yarn at the time of yarn winding.
As illustrated in FIG. 1, the automatic winder 1
includes a plurality of winding units 10 arranged in line,
an automatic doffing device 80, and a machine control device
20 90 as main components. Each winding unit 10 is configured
to wind a yarn 20 unwound from a yarn supplying bobbin 21
while traversing the yarn 20 to form a package (wound
package) 30.
When the package 30 is fully wound in one of the
25 winding units 10, the automatic doffing device 80 travels
to a position of the relevant winding unit 10 to collect
the fully-wound package 30 discharged from the winding unit
10 and supply an empty bobbin to the winding unit 10.
The machine control device 90 includes a setting
30 section 91 and a display section 92 as main components. The
setting section 91 can carry out the setting with respect
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to each winding unit 10 when an operator inputs a
predetermined set value or selects an appropriate control
method. The display section 92 is configured to be able
to display winding status of the yarn 20 in each winding
5 unit 10, content of trouble that occurred, and the like.
The display section 92 may be configured by a touch panel,
and the setting section 91 may be included in the display
section 92.
Next, a description will be specifically made on a
10 structure of the winding unit 10 with reference to FIG. 2.
As illustrated in FIG. 2, each winding unit 10 includes a
winding unit main body 16 and a unit control section 50 as
main components.
The unit control section 50, for example, is
15 configured to include a CPU, a RAM, a ROM, an I/O port, and
a communication port. The ROM stores a program for
controlling each component of the winding unit main body
16. Each component (details to be described later) of the
winding unit main body 16 and the machine control device
20 90 are connected to the I/O port and the communication port,
thus enabling communication of control information and the
like. The unit control section 50 thus can control the
operation of each component of the winding unit main body
16.
25 The winding unit main body 16 includes a yarn
unwinding assisting device 12, a tension applying device
13, a splicer device (yarn joining device) 14, and a yarn
monitoring device 15, in this order from the yarn supplying
bobbin 21, on a yarn travelling path between the yarn
30 supplying bobbin 21 and a contact roller (touch roller) 29.
A yarn supplying section 11 is arranged at a lower
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part of the winding unit main body 16. The yarn supplying
section 11 is configured to hold the yarn supplying bobbin
21 transported by a bobbin transportation system (not
illustrated) at a prescribed position.
5 The yarn unwinding assisting device 12 assists the
unwinding of the yarn 20 from the yarn supplying bobbin 21
by lowering a regulating member 40 covering a core tube of
the yarn supplying bobbin 21 accompanying unwinding of the
yarn 20 from the yarn supplying bobbin 21. The regulating
10 member 40 makes contact with a balloon of the yarn 20 formed
at an upper part of the yarn supplying bobbin 21 by rotation
and a centrifugal force of the yarn 20 unwound from the yarn
supplying bobbin 21 to control the balloon of the yarn 20
to an appropriate size, thus assisting the unwinding of the
15 yarn 20. A sensor (not illustrated) for detecting a chase
portion of the yarn supplying bobbin 21 is arranged in
proximity to the regulating member 40. When this sensor
detects lowering of the chase portion, the yarn unwinding
assisting device 12 lowers the regulating member 40 by an
20 air cylinder (not illustrated), for example, following the
lowering of the chase portion.
The tension applying device 13 applies a
predetermined tension on the travelling yarn 20. As the
tension applying device 13, for example, a gate-type
25 tension applying device may be used in which movable comb
teeth are arranged with respect to fixed comb teeth. The
movable comb teeth are swung by a rotary solenoid so that
the movable comb teeth are engaged with or released from
the fixed comb teeth. A disc-type tension applying device
30 13, for example, may be adopted instead of the gate-type
tension applying device described above.
6 / 34
The splicer device 14 joins a lower yarn from the yarn
supplying bobbin 21 and an upper yarn from the package 30
after the yarn monitoring device 15 detects a yarn defect
and cuts the yarn, after yarn breakage while unwinding the
5 yarn from the yarn supplying bobbin 21, and the like. Such
a yarn joining device adapted to join the upper yarn and
the lower yarn may be a mechanical knotter or a device that
uses fluid such as compressed air.
The yarn monitoring device 15 includes a head 49
10 provided with a sensor (not illustrated) for detecting a
thickness of the yarn 20, and an analyzer 52 for processing
a yarn thickness signal from the sensor. The yarn
monitoring device 15 detects a yarn defect such as slub by
monitoring the yarn thickness signal from the sensor. A
15 cutter 39 for immediately cutting the yarn 20 when the yarn
defect is detected by the yarn monitoring device 15 is
arranged in proximity to the head 49.
A lower yarn catching member 25 for catching a yarn
end of the lower yarn and guiding the yarn end to the splicer
20 device 14 is arranged below the splicer device 14 . An upper
yarn catching member 26 for catching a yarn end of the upper
yarn and guiding the yarn end to the splicer device 14 is
arranged above the splicer device 14. The lower yarn
catching member 25 includes a lower yarn pipe arm 33, and
25 a lower yarn suction mouth 32 formed at a distal end of the
lower yarn pipe arm 33. The upper yarn catching member 26
includes an upper yarn pipe arm 36, and an upper yarn suction
mouth (yarn catching section) 35 formed at a distal end of
the upper yarn pipe arm 36.
30 The lower yarn pipe arm 33 and the upper yarn pipe
arm 36 are configured to be swingable with shafts 34 and
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37 as a center, respectively. An appropriate negative
pressure source is connected to the lower yarn pipe arm 33
and the upper yarn pipe arm 36. The lower yarn pipe arm
33 is configured to generate a suction flow at the lower
5 yarn suction mouth 32 so as to suck and catch the yarn end
of the lower yarn. The upper yarn pipe arm 36 is configured
to generate a suction flow at the upper yarn suction mouth
35 so as to suck and catch the yarn end of the upper yarn.
A shutter (not illustrated) is arranged on a basal end side
10 of each of the lower yarn pipe arm 33 and the upper yarn
pipe arm 36. Each shutter is opened/closed in accordance
with the signal from the unit control section 50. The
stopping and generation of the suction flow from the lower
yarn suction mouth 32 and the upper yarn suction mouth 35
15 are thereby controlled.
The winding unit main body 16 includes a cradle
(holding section) 23 adapted to removably support a winding
bobbin 22, and a contact roller 29 adapted to be rotated
when brought into contact with a peripheral surface of the
20 winding bobbin 22 or a peripheral surface of the package
30. The winding unit main body 16 also includes an arm-type
traverse device 70 in proximity to the cradle 23 to traverse
the yarn 20, so that the yarn 20 can be wound into the package
30 while being traversed by the traverse device 70. A guide
25 plate 28 is arranged slightly upstream of a traversing area.
The guide plate 28 guides the yarn 20 from the upstream to
the traversing area. A traverse supporting point portion
27 made of ceramic is provided further upstream of the guide
plate 28. The traverse device 70 traverses the yarn 20 in
30 a direction indicated with an arrow in FIG. 2 with the
traverse supporting point portion 27 as a supporting point.
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The cradle 23 is configured to be swingable with a
swing shaft 48 as the center. The cradle 23 absorbs an
increase in a yarn layer diameter of the package 30
accompanying the winding of the yarn 20 around the winding
5 bobbin 22 by the swinging of the cradle 23. The cradle 23
includes a rotation speed sensor 24 adapted to measure a
rotation speed of the package 30.
A package driving motor (package driving section) 41
configured by a servo motor is attached to the cradle 23.
10 The winding bobbin 22 is rotatably driven by the package
driving motor 41 to wind the yarn 20 around the winding
bobbin 22. The package driving motor 41 can be rotatably
driven in a forward rotation (hereinafter simply referred
to as "forward rotation") of rotating the package 30
15 (winding bobbin 22) in the winding direction. Also, the
package driving motor 41 can be rotatably driven in a
reverse rotation (hereinafter simply referred to as
"reverse rotation") of rotating the package 30 in an
anti-winding direction, which is a direction opposite to
20 the winding direction. A motor shaft of the package driving
motor 41 is coupled with the winding bobbin 22 so as to be
relatively non-rotatable when the winding bobbin 22 is
supported by the cradle 23 (so-called direct drive type) .
An operation of the package driving motor 41 is
25 controlled by a package drive control section 42. The
package drive control section 42 controls the operation and
stop of the package driving motor 41 upon receiving an
operation signal from the unit control section 50. The
package driving motor 41 is not limited to a servo motor,
30 and may be various types of motors such as a step motor or
an induction motor.
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An angle sensor 44 adapted to detect an angle of the
cradle 23 is attached to the swing shaft 48. The angle
sensor 44 includes a rotary encoder, for example, and
transmits an angle signal corresponding to the angle of the
5 cradle 23 to the unit control section 50. Since the angle
of the cradle 23 changes with the increase in a wound
diameter of the package 30, the diameter of the package 30
can be detected by detecting the swing angle of the cradle
23 by the angle sensor 44. As the method of detecting the
10 diameter of the package 30, an appropriate configuration
that can detect the diameter of the package 30 such as a
method using a hall IC or an absolute type sensor may be
used other than the angle sensor 44.
The method of detecting the diameter of the package
15 30 includes, for example, a method of detecting based on
a total length of the yarn 20 wound into the package 30,
a winding speed of the yarn 20, and a type (thickness or
the like) of the yarn 20. The method of detecting the
diameter of the package 30 may also be a method of measuring
20 the time from the start of winding of the yarn 20 around
the package 30. Specifically, by obtaining the winding
speed of the yarn 20 and the type (thickness or the like)
of the yarn 20, and storing in advance a relationship
between an elapsed time from the start of winding of the
25 yarn 20 and the diameter of the package 30 in the unit control
section 50, the diameter of the package 30 can be calculated
based on the elapsed time.
The method of detecting the diameter of the package
30 may also be a method based on the travelling speed of
30 the yarn 20 on the yarn travelling path between the yarn
supplying bobbin 21 and the contact roller 29.
10 / 34
Specifically, the yarn monitoring device or a dedicated
yarn speed sensor is arranged on the yarn travelling path
to detect the travelling speed of the yarn 20. In the unit
control section 50, a winding angle is calculated based on
5 the travelling speed and the traverse speed of the yarn 20,
and a peripheral speed of the package 30 is calculated from
the winding angle and the yarn travelling speed. The
diameter of the package 30 can be calculated based on the
rotation speed of the package 30 and the peripheral speed
10 of the package 30. When obtaining the diameter of the
package 30 through calculation, the configuration for
detecting the angle of the cradle 23 such as the angle sensor
44 may be omitted.
As illustrated in FIG. 3, the traverse device 70
15 includes a traverse driving motor 76, an output shaft 77,
and a traverse arm 74. FIG. 3 is a view seen in an axial
direction of the contact roller 29. The rotation in the
winding direction of the package 30 is a clockwise direction
in FIG. 3, and the rotation in an anti-winding direction
20 of the package 30 is a counterclockwise direction in FIG.
3.
The traverse driving motor 76 is a motor adapted to
drive the traverse arm 74, and is configured by a servo motor
and the like. As illustrated in FIG. 2, the operation of
25 the traverse driving motor 76 is controlled by a traverse
control section 78. The traverse driving motor 76 may be
other motors such as a step motor, a voice coil motor, or
the like.
The traverse control section 78 is configured by a
30 hardware and the like by a dedicated microprocessor, and
controls the operation and the stop of the traverse driving
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motor 76 upon receiving a signal from the unit control
section 50. Power of the traverse driving motor 76 is
transmitted to a basal end portion of the traverse arm 74
through the output shaft 77 illustrated in FIG. 3. When
5 a rotor of the traverse driving motor 76 is rotated
forwardly and reversely, the traverse arm 74 is
reciprocated in the perpendicular direction (left and right
direction of FIG. 2 (winding width direction of the package
30)) on the plane of drawing of FIG. 3. The traverse arm
10 74 in FIG. 3 indicates a position at the end of the traverse.
A hook-shaped yarn guide section 73 is formed at a
distal end portion of the traverse arm 74. The traverse
arm 74 can guide the yarn 20 by the yarn guide section 73.
The yarn 20 can be traversed when the traverse arm 74 is
15 reciprocated while the yarn guide section 73 is guiding the
yarn 20.
Next, the structure of the cradle 23 will be described
with reference to FIGS. 4 and 5. As illustrated in FIG.
4, the winding unit main body 16 includes a rotation plate
20 17 rotatable around the swing shaft 48 as the center. The
cradle 23 is configured to integrally swing with a rotation
plate 17 around the swing shaft 48 as the center. A spring
18 for gradually reducing a contact pressure configured as
a tension spring, and an air cylinder 60 are connected to
25 the rotation plate 17 . A predetermined rotation torque can
be applied on the cradle 23 by the spring 18 and the air
cylinder 60.
The air cylinder (moving section) 60 is configured
as a double-acting cylinder which includes therein a piston
30 601. In FIG. 4, compressed air having an air pressure Pi
is supplied to a cylinder chamber on the right side in the
12 / 34
plane of drawing (side close to rotation plate 17) of the
piston 601, and compressed air having an air pressure P2
is supplied to a cylinder chamber on the left side in the
plane of drawing (side far from the rotation plate 17) of
5 the piston 601.
An electro-pneumatic regulator 61 is connected to a
pipe for supplying the compressed air having the air
pressure P2 to the air cylinder 60. The electro-pneumatic
regulator 61 can adjust the air pressure P2 in a stepless
10 manner. The control of the air pressure P2 by the
electro-pneumatic regulator 61 is carried out based on a
control signal input from the unit control section 50.
When the air pressure P2 is reduced in the
configuration of FIG. 4, the force of the air cylinder 60
15 pulling the cradle 23 increases, and thus the torque for
rotating the cradle 23 towards the front side of the winding
unit main body 16 with the swing shaft 48 as the center
increases. The contact roller 29 is arranged further on
the front side of the winding unit main body 16 than the
20 swing shaft 48, and hence the contact pressure of the
package 30 and the contact roller 29 can be enhanced by the
reduction of the air pressure P2. On the contrary, when
the air pressure P2 is increased, the force of the air
cylinder 60 pulling the cradle 23 weakens, and hence the
25 torque for rotating the cradle 23 towards the rear side of
the winding unit main body 16 around the swing shaft 48 as
the center increases. The contact pressure of the package
30 and the contact roller 29 thus can be weakened. By
further increasing the air pressure P2, the package 30 can
30 be separated from the surface of the contact roller 29.
Based on the configuration described above, the air
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cylinder 60 can move the cradle 23 and move the package 30.
Therefore, as illustrated in FIG. 5, the position of the
package 30 is switched between a position (non-contacting
position Ql) in which the package 30 is separated from the
5 contact roller 29 and a position (contacting position Q2)
in which the package 30 makes contact with the contact
roller 29.
Returning back to FIG. 2, the unit control section
50 of the present embodiment transmits a drive signal to
10 the package drive control section 42, and controls the
rotational drive of the package driving motor 41.
Specifically, when the yarn monitoring device 15 detects
the yarn defect and the yarn cut is carried out or when the
yarn breakage (hereinafter referred to as "yarn cut and the
15 like") occurs during the unwinding from the yarn supplying
bobbin 21, the unit control section 50 carries out the
forward rotation of rotating the package 30, in the winding
direction for a set period, in a separated state (lift-up
state) of being lifted up to the non-contacting position
20 Ql and separated from the contact roller 29.
The unit control section 50 controls the catching
operation (swinging of the lower yarn pipe arm 33 and the
upper yarn pipe arm 36) of the lower yarn catching member
25 and the upper yarn catching member 26. The unit control
25 section 50 moves the driving of the air cylinder 60 to move
the cradle 23, and controls the movement of the package 30
between the non-contacting position Ql and the contacting
position Q2 (see FIGS. 4 and 5) . The unit control section
50 controls the opening/closing of the shutter arranged in
30 the lower yarn pipe arm 33 and the upper yarn pipe arm 36,
and controls the stopping and the generation of the suction
14 / 34
flow from the lower yarn suction mouth 32 and the upper yarn
suction mouth 35.
In the winding unit 10 described above, when the yarn
cut and the like occurred, the lower yarn and the upper yarn
5 need to be joined in the splicer device 14. In the yarn
joining operation, the lower yarn needs to be caught with
the lower yarn suction mouth 32, and the upper yarn needs
to be caught with the upper yarn suction mouth 35, and pulled
out. The control of the pull-out operation of the upper
10 yarn is carried out in the winding unit 10 when the yarn
cut and the like occurred, and the pull-out method will be
described in detail below with reference to FIG. 2 and FIGS.
4 to 6.
In FIG. 6, the horizontal axis indicates time and the
15 vertical axis indicates the ON/OFF of each signal
transmitted from the unit control section 50 (similarly in
FIG. 7 to be described later). The lift-up signal is a
signal for driving the air cylinder 60 with the
electro-pneumatic regulator 61 to lift-up the package 30
20 to the non-contacting position Ql. The forward rotation
signal is a signal for forwardly rotating the package 30
by the package driving motor 41. The reverse rotation
signal is a signal for reversely rotating the package 30
by the package driving motor 41. The upper yarn catching
25 member drive signal is a signal for driving the upper yarn
catching member 26 and swinging the upper yarn pipe arm 36
to bring the upper yarn suction mouth 35 closer to the
package 30. A shutter open signal is a signal for
generating the suction flow from the upper yarn suction
30 mouth 35 with the shutter of the upper yarn pipe arm 36 in
the opened state.
15 / 34
First, during the winding operation before the yarn
cut and the like occur, the lift-up signal is turned OFF
and the surface of the package 30 makes contact with the
contact roller 29. The forward rotation signal is turned
5 ON, and the package 30 is forwardly rotated by the package
driving motor 41. At the time of the winding operation,
the package driving motor 41 is controlled by the unit
control section 50, and the rotation speed of the package
30 is assumed as a first rotation speed.
10 When the yarn cut and the like occurs during the
winding operation, the forward rotation signal is turned
OFF and the forward rotation of the package 30 is gradually
decelerated to a stop (time tO). The factors of the yarn
cut and the like include, for example, (A) when the yarn
15 monitoring device 15 detects the yarn defect and the yarn
20 is cut by the cutter 39 during a steady winding period
in which the yarn 20 is wound into the package 30 at a set
winding speed; (B) when the yarn 20 is cut by an excessive
tension and the like regardless of the cutter 39 during the
20 steady winding period; (C) when the yarn monitoring device
15 detects abnormality of the yarn 20 and the cutting of
the yarn 20 is executed by the cutter 39 during an
acceleration winding period until the rotation of the
package 30 reaches the set winding speed; and (D) when the
25 yarn 20 unwound from the yarn supplying bobbin 21 runs out
and a new yarn supplying bobbin 21 is set in the yarn
supplying section 11.
At time tl, the lift-up signal is turned ON, the
package 30 is lifted up to the non-contacting position Ql,
30 and the contact between the package 30 and the contact
roller 29 is released.
16 / 34
At time t2, the forward rotation signal is turned ON,
and the forward rotation of the package 30 is started in
the lift-up state in which the package 30 is lifted up to
the non-contacting position Ql (released state in which the
5 contact between the package 30 and the contact roller 29
is released) . During the set period a (i.e., from time t2
to time t3), the ON state of the forward rotation signal
is maintained, and the forward rotation of the package 30
in the lift-up state is carried out. At time t3, the forward
10 rotation signal is turned OFF, and the forward rotation of
the package 30 is gradually decelerated to a stop.
During the forward rotation of the package 30 in the
set period a, the package driving motor 41 is controlled
by the unit control section 50, and the rotation speed of
15 the package 30 is set to a second rotation speed. The second
rotation speed is a speed different from the first rotation
speed, and is assumed to be a speed higher than the first
rotation speed.
The set period a and the second rotation speed are
20 set in the unit control section 50. The set period a and
the second rotation speed may be a constant value, or may
be set according to the diameter of the package 30 at the
time of the occurrence of the yarn cut and the like. For
example, if the diameter of the package 30 is large, a yarn
25 end 30a is easily detached from the surface of the package
30, and hence the set period a can be set short and/or the
second rotation speed can be set low. For example, if the
diameter of the package 30 is small, the yarn end 30a is
less likely to detach from the surface of the package 30,
30 and hence the set period a can be set longer and/or the second
rotation speed can be set higher. The second rotation speed
17 / 34
may include a plurality of different speeds, or may be set
so that the speed becomes higher in the middle (certain time
point) of the forward rotation, for example.
The second rotation speed may be set so that the
5 peripheral speed of the package 30 (the travelling speed
of the yarn 20) becomes constant regardless of the diameter
of the package 30. In other words, the package driving
motor 41 may carry out the forward rotation for the set
period a in the lift-up state so that the peripheral speed
10 of the package 30 becomes constant regardless of the
diameter of the package 30. The second rotation speed may
be set so that the peripheral speed of the package 30 changes
according to the diameter of the package 30. In other words,
the package driving motor 41 may carry out the forward
15 rotation for the set period a in the lift-up state so that
the peripheral speed of the package 30 becomes the speed
corresponding to the diameter of the package 30.
At time t4, the upper yarn catching member drive
signal is turned ON, the upper yarn pipe arm 36 is swung
20 so that the upper yarn suction mouth 35 approaches the
package 30, and the upper yarn suction mouth 35 is moved
to the yarn end catching position. At time t4, the shutter
open signal is turned ON, the shutter of the upper yarn pipe
arm 36 is opened, and the suction flow is generated from
25 the upper yarn suction mouth 35. At time t5, the reverse
rotation signal is turned ON, and the reverse rotation of
the package 30 is started in the lift-up state. Thus, the
yarn end 30a of the package 30 that reversely rotates in
the lift-up state is sucked and caught by the upper yarn
30 suction mouth 35.
At time t6, the lift-up signal is turned OFF, and the
18 / 34
package 30 is moved to the contacting position Q2 where the
package 30 makes contact with the contact roller 29. Thus,
the yarn end 30a of the package 30 that reversely rotates
while being located at the contacting position Q2 is sucked
5 and caught by the upper yarn suction mouth 35 located in
proximity to the surface of the package 30.
At time t7, the upper yarn catching member drive
signal is turned OFF, and the upper yarn suction mouth 35
is moved towards the yarn joining position. Thus, the yarn
10 end 30a of the package 30 is guided to the splicer device
14, and the yarn joining operation of the lower yarn caught
by the lower yarn suction mouth 32 and the upper yarn caught
by the upper yarn suction mouth 35 is started in the splicer
device 14. At time t8, the reverse rotation signal is
15 turned OFF, and the reverse rotation of the package 30 is
gradually decelerated to a stop. At time t9, which
corresponds to the time after the yarn joining operation
is completed, the shutter open signal is turned OFF, the
shutter of the upper yarn pipe arm 36 is closed, and the
20 suction flow is stopped from the upper yarn suction mouth
35.
As described above, in the winding unit 10 of the
present embodiment, when the set period for forwardly
rotating, in the lift-up state, the package 30 having the
25 yarn end 30a is set, and the yarn cut and the like occurred,
the package 30 can be forwardly rotated additionally only
for a set period a in the lift-up state. The yarn end 30a
thus can be detached from the package 30 by a centrifugal
force of the rotation when the package 30 is forwardly
30 rotated. As a result, the pull-out rate of the upper yarn
at the time of catching the upper yarn can be enhanced.
19 / 34
The package driving motor 41 can rotate the package
30 at the first rotation speed in the winding operation of
the package 30 and the second rotation speed when forwardly
rotating the package 30 for the set period a in the lift-up
5 state. The first rotation speed and the second rotation
speed are speeds different from one another. Thus, the
package 30 can be rotated at the rotation speeds
respectively suitable for the winding operation of the
package 30 and the forward rotation in the lift-up state.
10 In particular, the second rotation speed is higher than the
first rotation speed, and the yarn end 30a can thus be
further detached from the package 30.
In the package driving motor 41, at least one of the
set period a and the second rotation speed can be changed
15 according to the diameter of the package 30. Although
easiness of attachment of the yarn end 30a differs depending
on the size of the diameter of the package 30, the
above-described operation effect of detaching the yarn end
30a from the package 30 by the centrifugal force of the
20 rotation can be controlled according to the easiness of
attachment of the yarn end 30a. A load applied on the
package driving motor 41 can also be adjusted depending on
the size of the diameter of the package 30.
In particular, when the diameter of the package 30
25 is large, the set period a can be set short and/or the second
rotation speed can be set low, and thus safety in detaching
the yarn end 30a can be enhanced. When the diameter of the
package 30, to which the yarn end 30a easily attaches, is
small, the set period a can be set long and/or the second
30 rotation speed can be set high, and thus the centrifugal
force of the rotation when forwardly rotating the package
20 / 34
30 in the lift-up state can be enhanced to further detach
the yarn end 30a.
In the package driving motor 41, the forward rotation
can be carried out for the set period a in the lift-up state
5 so that the peripheral speed of the package 30 becomes
constant regardless of the diameter of the package 30. Thus,
the operation effect of detaching the yarn end 30a from the
package 30 by the centrifugal force of the rotation can be
stably realized. The load of the cradle 23 by the forward
10 rotation can be reduced, and damage of the cradle 23 can
also be suppressed.
In the package driving motor 41, the forward rotation
can be carried out for the set period a in the lift-up state
so that the peripheral speed of the package 30 becomes the
15 speed corresponding to the diameter of the package 30 . Thus,
the force acting on the yarn end 30a becomes constant, and
the force of detaching the yarn end 30a from the package
30 can be stabilized.
The winding unit 10 includes the upper yarn suction
20 mouth 35 adapted to catch the yarn end 30a. In the winding
unit 10 described above, the yarn end 30a can be detached
from the package 30, and hence the yarn end 30a can be
reliably caught by the upper yarn suction mouth 35. As a
result, the occurrence of the pull-out mistake of the upper
25 yarn can be reduced.
The package driving motor 41 forwardly rotates the
package 30 for the set period a in the lift-up state, and
then reversely rotates the package 30 in the lift-up state.
The yarn end 30a thus can be further detached from the
30 package 30.
FIG. 7 is a chart diagram illustrating another
21 / 34
example of the operation of the winding unit 10. As
illustrated in FIG. 7, when the yarn cut and the like occurs
during the winding operation, the forward rotation signal
may not be turned OFF and the forward rotation of the package
5 30 may not be gradually decelerated to a stop. Specifically,
in a state where the forward rotation of the package 30 is
continued, the lift-up signal is turned ON at time tl, the
package 30 is lifted up to the non-contacting position Ql,
and the contact between the package 30 and the contact
10 roller 29 is released. In this case, the set period a' set
in the unit control section 50 is the period from time tl
to time t3 at which the forward rotation signal is turned
OFF.
In this example, the forward rotation is continued
15 with the rotation speed of the package 30 made constant
after the occurrence of the yarn cut and the like and until
time tl at which the package 30 is lifted up. However, the
forward rotation may be continued while decelerating the
package 30 at the deceleration at which the package 30 does
20 not come to a stop.
As illustrated in FIG. 7, at time t6' (i.e., after
time t3 at which the forward rotation signal is turned OFF
and before time t4 at which the upper yarn catching member
drive signal and the shutter open signal are turned ON),
25 the lift-up signal may be turned OFF and the package 30 may
be moved to the contacting position Q2. In this case, the
package driving motor 41 reversely rotates the package 30
after forwardly rotating the package 30 for the set period
a' in the lift-up state and after moving the package 30 to
30 the contacting position Q2. Thus, when catching the yarn
end 30a by the upper yarn suction mouth 35 at time t4 to
22 / 34
t7, the distance between the upper yarn suction mouth 35
and the package 30 can be stabilized.
One embodiment of the present invention has been
described above, but the present invention is not limited
5 to the above embodiment. In the embodiment described above,
the package 30 is rotatably driven directly by the package
driving motor 41, but in the present invention, the contact
roller may be rotatably driven so that the package 30 is
rotated accompanying the rotation of the contact roller.
10 The unit control section 50 of the embodiment
described above may determine whether or not to forwardly
rotate the package 30 for the set period a in the lift-up
state based on the diameter of the package 30. The package
driving motor 41 may forwardly rotate the package 30 for
15 the set period a in the lift-up state according to the
determination result of the unit control section 50. The
easiness of attachment of the yarn end 30a differs depending
on the size of the diameter of the package 30, and the
presence or the absence of the forward rotation can be
20 controlled according to the easiness of attachment of the
yarn end 30a. The forward rotation of the package 30 in
the lift-up state does not need to be performed on a constant
basis when the yarn cut and the like occur, and thus the
lowering of the production efficiency can be suppressed.
25 For example, the unit control section 50 may
determine to forwardly rotate the package 30 for the set
period a only when the diameter of the package 30 is smaller
than or equal to a first set diameter, and the package
driving motor 41 may forwardly rotate the package 30 for
30 the set period a in the lift-up state only when the diameter
of the package 30 is smaller than or equal to the first set
23 / 34
diameter. In this case, if the diameter of the package 30
is greater than the first set diameter, the package 30 is
not forwardly rotated for the set period a in the lift-up
state, and the usual pull-out operation of the upper yarn
5 is carried out. Thus, the yarn end 30a can be actively
detached from the package 30 only when the diameter of the
package 30 is small and the yarn end 30a is easily attached
to the package 30, for example. The unit control section
50 in this case configures a determining section.
10 When the yarn cut and the like occurs, the usual
pull-out operation of the upper yarn (pull-out operation
of not forwardly rotating the package 30 for the set period
a in the lift-up state) is first carried out to perform the
yarn joining operation. At this time, the pull-out
15 operation described above illustrated in FIGS. 5 and 6 may
be carried out only when the upper yarn is detected by the
yarn monitoring device 15 (at the time of catching mistake
of the upper yarn by the upper yarn suction mouth 35) . The
forward rotation of the package 30 in the lift-up state does
20 not need to be performed on a constant basis when the yarn
cut and the like occur, and thus the lowering of the
production efficiency can be suppressed.
In the embodiment described above, the package drive
control section 42, the traverse control section 78, and
25 the unit control section 50 are separately arranged, but
at least part of such control sections may be integrated.
In the embodiment described above, a structure of moving
the package 30 between the non-contacting position Ql and
the contacting position Q2 by the air cylinder 60 has been
30 illustrated. However, a structure of moving the package
30 between the non-contacting position Ql and the
24 / 34
contacting position Q2 by a step motor and the like may be
adopted. In the embodiment described above, the
open/close operation of the shutter is controlled by the
unit control section 50 to control the stop and generation
5 of the suction flow from the upper yarn suction mouth 35,
but the shutter may be constantly open. In this case, the
control of the unit control section 50 can be simplified,
for example.
In the embodiment described above, the package 30 may
10 be reversely rotated once and then forwardly rotated for
the set period a in the lift-up state. In this case, the
yarn end 30a can be made to easily detach from the package
30. In the embodiment described above, the
electro-pneumatic regulator 61 may be omitted, and the
15 package 30 may be lifted up with only the turning ON/OFF
of the air supply to the air cylinder 60. In the embodiment
described above, the package 30 may be reversely rotated
at the rotation speed at which the yarn end 30a can be
detached for the set period in the lift-up state. In this
20 case as well, the operation effect of being able to detach
the yarn end 30a from the package 30 is obtained.
In such a yarn winding machine, the set period for
forwardly rotating the package having the yarn end in the
separated state is set, and the package can be forwardly
25 rotated for the set period in the separated state when the
yarn is disconnected, for example. The yarn end thus can
be detached from the package by a centrifugal force of the
rotation in the forward rotation.
In the yarn winding machine of the present invention,
30 the package driving section may rotate the package at a
first rotation speed for winding a yarn into the package
25 / 34
and a second rotation speed for carrying out the forward
rotation for the set period in the separated state, and the
first rotation speed and the second rotation speed may be
speeds different from one another. Thus, the package can
5 be rotated at the rotation speeds respectively suitable for
the winding operation and the forward rotation,
respectively.
In the yarn winding machine of the present invention,
the package driving section may change at least one of the
10 set period and the second rotation speed according to a
diameter of the package. Although easiness of attachment
of the yarn end differs depending on a size of the diameter
of the package, the above-described operation effect of
detaching the yarn end from the package by the centrifugal
15 force of the rotation can be controlled according to the
easiness of attachment of the yarn end.
The yarn winding machine of the present invention may
further include a determining section adapted to determine
whether or not to carry out the forward rotation for the
20 set period in the separated state based on a diameter of
the package, wherein the package driving section may carry
out the forward rotation for the set period in the separated
state in accordance with a determination result of the
determining section. The easiness of attachment of the
25 yarn end differs depending on the size of the diameter of
the package, but the presence or the absence of the forward
rotation can be controlled according to the easiness of
attachment of the yarn end.
In the yarn winding machine of the present invention,
30 the package driving section may carry out the forward
rotation for the set period in the separated state such that
26 / 34
a peripheral speed of the package becomes constant. Thus,
the operation effect of detaching the yarn end from the
package by the centrifugal force of the rotation can be
stably realized.
5 In the yarn winding machine of the present invention,
the package driving section may carry out the forward
rotation for the set period in the separated state such that
a peripheral speed of the package becomes a speed
corresponding to a diameter of the package. Thus, the force
10 acting on the yarn end becomes constant, and the force of
detaching the yarn end from the package can be stabilized.
The yarn winding machine of the present invention may
further include a yarn catching section adapted to catch
the yarn end. In this case, the yarn end detached from the
15 package can be caught by the yarn catching section.
In the yarn winding machine of the present invention,
the package driving section may carry out a reverse rotation
of rotating the package in a direction opposite to the
winding direction in the separated state after carrying out
20 the forward rotation for the set period in the separated
state. The yarn end thus can be further detached from the
package.
In the yarn winding machine of the present invention,
the package driving section may carry out a reverse rotation
25 of rotating the package in a direction opposite to the
winding direction after carrying out the forward rotation
for the set period in the separated state and after the
package is brought into contact with the touch roller by
the moving section. Thus, when catching the yarn end of
30 the package by the yarn catching section, for example, a
distance between the yarn catching section and the package
27 / 34
can be stabilized. The moving section moves the holding
section to move the package between the contacting position
and the separating position. The package driving section
is arranged in the holding section. The package driving
5 section rotatably drives the package directly. The
package driving section is a rotation motor.
According to the present invention, a yarn winding
machine capable of detaching the yarn end from the package
is provided.

WE CLAIM:
1. A yarn winding machine comprising:
a holding section adapted to hold a package;
5 a touch roller adapted to make contact with a surface
of the package held by the holding section;
a moving section adapted to move the package between
a position in which the package makes contact with the touch
roller and a position in which the package is separated from
10 the touch roller; and
a package driving section adapted to rotatably drive
the package,
wherein the package driving section carries out a
forward rotation of rotating the package in a winding
15 direction for a set period in a separated state in which
the package having a yarn end is separated from the touch
roller by the moving section.
2. The yarn winding machine according to claim 1,
20 wherein the package driving section rotates the package at
a first rotation speed for winding a yarn into the package
and at a second rotation speed for carrying out the forward
rotation for the set period in the separated state, the
first rotation speed and the second rotation speed being
25 speeds different from one another.
3. The yarn winding machine according to claim 2,
wherein the package driving section changes at least one
of the set period and the second rotation speed according
30 to a diameter of the package.
29 / 34
4 . The yarn winding machine according to any one of
claims 1 to 3, further comprising a determining section
adapted to determine whether or not to carry out the forward
rotation for the set period in the separated state based
5 on a diameter of the package,
wherein the package driving section carries out the
forward rotation for the set period in the separated state
in accordance with a determination result of the
determining section.
10
5. The yarn winding machine according to any one of
claims 1 to 4, wherein the package driving section carries
out the forward rotation for the set period in the separated
state such that a peripheral speed of the package becomes
15 constant.
6. The yarn winding machine according to any one of
claims 1 to 4, wherein the package driving section carries
out the forward rotation for the set period in the separated
20 state such that a peripheral speed of the package becomes
a speed corresponding to a diameter of the package.
7 . The yarn winding machine according to any one of
claims 1 to 6, further comprising a yarn catching section
25 adapted to catch the yarn end.
8 . The yarn winding machine according to any one of
claims 1 to 7, wherein the package driving section carries
out a reverse rotation of rotating the package in a
30 direction opposite to the winding direction in the
separated state after carrying out the forward rotation for
30 / 34
the set period in the separated state.
9. The yarn winding machine according to any one of
claims 1 to 7, wherein the package driving section carries
5 out a reverse rotation of rotating the package in a
direction opposite to the winding direction after carrying
out the forward rotation for the set period in the separated
state and after the package is brought into contact with
the touch roller by the moving section.
10
10. The yarn winding machine according to any one
of claims 1 to 9, wherein the moving section moves the
package between the contacting position and the separating
position by moving the holding section.
15
11. The yarn winding machine according to claim 10,
wherein the package driving section is arranged in the
holding section.
20 12. The yarn winding machine according to claim 11,
wherein the package driving section rotatably drives the
package directly.
13. The yarn winding machine according to claim 12,
25 wherein the package driving section is a rotation motor.
14. A method for operating yarn winding machine
comprising the following steps:
holding the package in a holding section;
30 moving the package between a position in which the
package makes contact with a touch roller and a position
31 / 34
in which the package is separated from the touch roller;
and
driving the package,
characterized by rotating the package in a winding
5 direction for a set period in a separated state in which
the package having a yarn end is separated from the touch
roller.
15. The method according to claim 14, wherein a
10 package driving section rotates the package at a first
rotation speed for winding a yarn into the package and at
a second rotation speed for carrying out the forward
rotation for the set period in the separated state, the
first rotation speed and the second rotation speed being
15 speeds different from one another.
16. The method according to claim 15, wherein the
package driving section changes at least one of the set
period and the second rotation speed according to a diameter
20 of the package.
17. The method according to any one of claims 14 to
16, further comprising determining whether or not to carry
out the forward rotation for the set period in the separated
25 state based on a diameter of the package,
wherein the forward rotation is carried out for the
set period in the separated state in accordance with a
determination result.
30 18. The method according to any one of claims 14 to
17, wherein the forward rotation is carried out for the set
32 / 34
period in the separated state such that a peripheral speed
of the package becomes constant.
19. The method according to any one of claims 14 to
5 17, wherein the forward rotation is carried out for the
set period in the separated state such that a peripheral
speed of the package becomes a speed corresponding to a
diameter of the package.
10 20. The method according to any one of claims 14 to
19, wherein a reverse rotation of rotating the package in
a direction opposite to the winding direction is carried
out in the separated state after carrying out the forward
rotation for the set period in the separated state.
15
21. The method according to any one of claims 14 to
19, a reverse rotation of rotating the package in a
direction opposite to the winding direction is carried out
after carrying out the forward rotation for the set period
20 (a, a') in the separated state and after the package is
brought into contact with the touch roller.