Field of the Invention
5 The present invention mainly relates to a yarn
winding device that winds a yarn while traversing the
yarn.
2. Description of the Related Art
10 Conventionally, there is known a yarn winding
device that rotatably supports a winding bobbin with a
cradle and winds a yarn while traversing the yarn on an
outer peripheral surface of the bobbin to form a package.
Some of this type of yarn winding devices have, as
15 shown in JP 2018-080057 A, a configuration of depositing
an end of a yarn in a defined manner on a tube outside
a profile of a standard yarn package, by rotating in the
same direction as that during a winding process in a
standard production of the yarn, and moving a yarn guide
20 of the responsible device laterally outside the profile
of the standard yarn package on a bobbin.
The yarn winding device disclosed in JP 2018-080057
A deposits a yarn on the tube outside the profile of the
package by rotating in the same direction as that during
25 the winding process in the standard production of the
3
yarn, and then moving the yarn guide of the responsible
device.
As described above, the yarn winding device may
perform control for depositing the yarn on the tube
5 outside the profile of the package.
Meanwhile, in a conical-wound package and the like,
an inclination is formed on a small-diameter side of the
package. Therefore, by performing an operation of
moving the yarn guide continuously with the winding
10 process in the standard production of the yarn as
illustrated in FIG. 5 when trying to deposit the yarn on
a winding tube on the small-diameter side, a bunch will
be formed at the same winding speed and winding angle as
those of the winding process in the standard production
15 of the yarn. At this time, if the winding angle is not
sufficiently taken, the yarn will move to the outside of
the winding tube with momentum as it is and move to the
outside of the package profile, and even further move up
to a position beyond a width of the winding tube. This
20 causes the yarn to fall between the winding tube and a
small-diameter side support arm that supports the smalldiameter side of the winding tube, and causes formation
a ring-shaped lump of the yarn attached to the package
when the winding tube is removed from the supporting arm.
25 This lump may cause problems such as the yarn being drawn
4
out of the package during a package transportation
process and the drawn-out yarn becoming entangled.
BRIEF SUMMARY OF THE INVENTION
5 The present invention has been made in view of the
above circumstances, and an object of the present
invention is to change a winding angle by a predetermined
winding control to reliably deposit a yarn on a winding
tube.
10 The problems to be solved by the present invention
are as described above, and the means for solving such
problems and effects will be described next.
According to a viewpoint of the present invention,
a yarn winding device having the following configuration
15 is provided. That is, the yarn winding device includes:
a yarn supplying section on which a yarn supplying bobbin
is supported; a winding section that winds a yarn drawn
out from the yarn supplying section, around a winding
tube to form a package; a yarn length measuring section
20 that counts a length of a yarn wound by the winding
section; a yarn traverse section that is provided in the
winding section and guides a yarn by reciprocating with
a traverse width set in a rotation axis direction of the
package; and a winding control section that controls the
25 yarn traverse section to allow the yarn to be wound at
5
a winding angle that has been set. The winding control
section executes, after the yarn length measuring
section finishes winding of a required length of the
yarn, bunch forming control of moving the yarn from
5 within a range of the traverse width to outside the range
at a bunch forming angle set in advance by the yarn
traverse section, and winding the yarn around the winding
tube, and the bunch forming angle is larger than the
winding angle.
10 In the bunch forming control, since the yarn is
moved from within the range of the traverse width to
outside the range at the bunch forming angle larger than
the winding angle, a trajectory of the yarn is almost
straight when the yarn falls from a surface of the
15 package onto the winding tube. Allowing the yarn to
fall from the surface of the package onto the winding
tube in a nearly straight trajectory in this way enables
prevention of movement of the yarn to a position beyond
the width of the winding tube due to an excessive force,
20 and of falling of the yarn between the winding tube and
the small-diameter side support arm that supports the
small-diameter side of the winding tube.
In the yarn winding device, the yarn traverse
section includes a yarn hooking section on which the
25 yarn is hooked, and a traverse arm member having the
6
yarn hooking section attached to one end and a drive
source attached to the other end.
Since the yarn is guided by the arm type traverse
member, the winding angle can be freely changed. This
5 makes it possible to set an optimum bunch forming angle
in accordance with a yarn type and the like, and move
the yarn from within the range of the traverse width to
outside the range.
The yarn winding device includes a yarn cutting
10 section that cuts the yarn, and a yarn joining device
that connects the yarn when the yarn is cut. The winding
control section causes the yarn cutting section to cut
the yarn after receiving a notification that a required
length of the yarn is wound in the package from the yarn
15 length measuring section, causes the yarn joining device
to execute a yarn joining operation of joining the cut
yarn after stopping rotation of the package by the
winding section, and then executes the bunch forming
control.
20 In the yarn winding device, the yarn is cut by the
yarn cutting section after reception of a notification
that a required length of the yarn has been wound in the
package, and the bunch forming control is executed after
stopping of the rotation of the package by the winding
25 section. Temporarily stopping the rotation of the
7
package in this way eliminates movement of the yarn in
the winding direction, and makes it possible to easily
realize the bunch forming angle larger than the winding
angle. In addition, since the yarn is cut when a
5 required length of the yarn is wound in the package, it
is possible to inhibit winding of an extra yarn in the
package.
In the yarn winding device, before executing the
bunch forming control after executing the yarn joining
10 operation, the winding control section causes the
winding section to start winding of the package, executes
a yarn hooking operation for causing the connected yarn
to be hooked on the yarn hooking section of the traverse
arm member, and stops the winding of the package by the
15 winding section.
In the yarn winding device, it is required to
rotate the package in the winding direction in order to
cause the yarn to be hooked on the yarn hooking section
of the traverse arm member. However, since the winding
20 of the package is stopped after the yarn is hooked on
the yarn hooking section, the bunch forming angle larger
than the winding angle can be reliably realized.
In the yarn winding device, in the bunch forming
control, the winding control section moves the yarn from
25 within the range of the traverse width to outside the
8
range by using the bunch forming angle set in advance by
the yarn traverse section, in a state where the winding
of the package by the winding section is stopped.
Further, in the yarn winding device, the bunch forming
5 angle is an angle formed by moving the yarn nipped by
the surface of the package and a contact roller that
supports the package and assists in winding of the yarn,
at a center position of the package in a traverse width
direction, to outside the range of the traverse width
10 with the yarn hooking section.
In the yarn winding device, since the yarn is moved
from within the range of the traverse width to outside
the range at the bunch forming angle set in advance by
the yarn traverse section in a state where the winding
15 of the package is stopped, the yarn is in a state of
being nipped by the contact roller and the surface of
the package. Moving the yarn from within the range of
the traverse width to outside the range in this state
makes it possible to reliably realize the bunch forming
20 angle larger than the winding angle.
In the yarn winding device, the package wound by
the winding section is a conical package. In the bunch
forming control, the winding control section causes the
yarn traverse section to guide the yarn to outside the
25 traverse width on a small-diameter side of the conical
9
package. Further, even if the yarn is moved while the
yarn is nipped as described above, the yarn is supplied
from the yarn supplying bobbin, so that the yarn does
not break due to an increase in tension.
5 In this bunch forming control, the bunch can be
reliably formed even on the small-diameter side of the
conical package in which the yarn is likely to move to
a position beyond the width of the winding tube due to
an excessive force.
10 In the yarn winding device, in the bunch forming
control, the winding control section causes the yarn
traverse section to guide the yarn to outside the
traverse width on the small-diameter side of the conical
package, and, after a predetermined yarn length is wound
15 on the winding tube on the small-diameter side of the
package, performs yarn end centering control of causing
the yarn traverse section to guide the yarn from outside
the traverse width on the small-diameter side of the
conical package toward a center of the traverse width.
20 In this bunch forming control, after a
predetermined yarn length is wound on the winding tube
on the small-diameter side of the package, the yarn
traverse section is caused to guide the yarn from outside
the traverse width on the small-diameter side of the
25 conical package toward the center of the traverse width.
10
This allows a yarn end part to be wound around the
surface of the package. Winding the yarn end around the
surface of the package enables prevention of an
occurrence of a malfunction that the yarn end becomes
5 free and comes loose to be dragged in a transport process
or the like.
The winding control section causes the yarn cutting
section to cut the yarn simultaneously with or after
completion of the yarn end centering control.
10 By keeping the length of the yarn wound around a
center of the package to the minimum necessary in the
yarn end centering control, an operator can easily find
and draw out the yarn end.
In the bunch forming control, the winding control
15 section causes the yarn traverse section to guide the
yarn to outside the traverse width on the small-diameter
side of the conical package, and rotates the package
with any number of rotations in a range of 1.75 rotations
to 2.25 rotations when a predetermined yarn length is
20 wound on the winding tube on the small-diameter side of
the package.
Rotating with the above-mentioned number of
rotations allows the yarn crossing over the winding tube
to the surface of the package to be formed at an angle
25 of 90 degrees or less. The cross-over yarn formed in
11
this way can be easily picked up when the operator picks
up the yarn with a finger in a later process, so that an
effect of improving work efficiency is exhibited.
Further, when the operator picks up the yarn by picking
5 up a bunch formed on the winding tube as well, the bunch
can be easily removed and the yarn can be picked up as
long as the number of rounds of bunch winding is about
two.
A bunch forming method for forming a bunch on a
10 winding tube of a package wound with a yarn includes: a
first process of winding a required length as the
package; a second process of causing a cutter to cut a
yarn and simultaneously stopping winding of the package;
a third process of connecting the cut yarn; a fourth
15 process of engaging a yarn with a yarn hooking section
of a traverse arm member while rotating the package in
a yarn winding direction; a fifth process of stopping
the yarn hooking section of the traverse arm member at
a center position in a traverse width direction, and
20 stopping rotation of the package in the yarn winding
direction; and a sixth process of moving the yarn hooking
section of the traverse arm member supplemented with the
yarn to a bunch forming position outside a standard
traverse width for winding the yarn on a surface of the
25 package.
12
The bunch forming method includes a seventh process
of moving the yarn hooking section of the traverse arm
member from the bunch forming position outside the
standard traverse width to a package center that is a
5 standard traverse width.
In forming a bunch by the above method, since the
yarn is moved from within the range of the traverse width
to outside the range at the bunch forming angle larger
than the winding angle, a trajectory of the yarn is
10 almost straight when the yarn falls from the surface of
the package onto the winding tube. Allowing the yarn to
fall from the surface of the package onto the winding
tube in a nearly straight trajectory in this way enables
prevention of movement of the yarn to a position beyond
15 the width of the winding tube due to an excessive force,
and of falling of the yarn between the winding tube and
the small-diameter side support arm that supports the
small-diameter side of the winding tube.
20 BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of an automatic winder
according to an embodiment of the present invention;
FIG. 2 is a front view and a block diagram of a
winding unit;
25 FIG. 3 is a schematic side view of a traverse
13
device;
FIG. 4 is a schematic front view of the traverse
device;
FIG. 5 is a schematic front view of the traverse
5 device, in conventional bunch formation;
FIG. 6 is a schematic front view of the traverse
device, at a start of bunch forming control;
FIG. 7 is a schematic front view of the traverse
device, during bunch formation in the bunch forming
10 control;
FIG. 8 is a schematic front view of the traverse
device, at a start of yarn end centering control;
FIG. 9 is a schematic front view of the traverse
device, at an end of the yarn end centering control and
15 at an end of bunch forming control;
FIG. 10 is a flowchart of the bunch forming control
and the yarn end centering control;
FIG. 11 is a detailed flowchart of the bunch
forming control; and
20 FIG. 12 is a detailed flowchart of the yarn end
centering control.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Next, an embodiment of the invention will be
25 described. First, an overall configuration of an
14
automatic winder (a yarn winding device) 1 of the present
embodiment will be described with reference to FIG. 1.
FIG. 1 is a front view of an automatic winder 1 according
to an embodiment of the present invention. Note that,
5 in the present specification, “upstream” and “downstream”
respectively refer to upstream and downstream in a
travelling direction of a yarn at a time of yarn winding.
As illustrated in FIG. 1, the automatic winder (the
yarn winding device) 1 includes a plurality of winding
10 units 10 arranged side by side, an automatic doffing
device 80, and a machine control device 90 as main
components.
Each winding unit 10 is configured to wind a yarn
20 unwound from a yarn supplying bobbin 21 while
15 traversing the yarn 20, to form a package 30.
The automatic doffing device 80 is configured to
be able to, when the package 30 becomes full in each
winding unit 10, travel to a position of the winding
unit 10, collect the full package 30, and supply an empty
20 bobbin.
The machine control device 90 includes an operation
section 91 and a display section 92 as main components.
The operation section 91 enables an operator to input a
predetermined set value or select an appropriate control
25 method to perform setting on each winding unit 10. The
15
display section 92 is configured to be able to display
winding status of the yarn 20 in each winding unit 10,
contents of trouble that has occurred, and the like.
Next, a detailed configuration of the winding unit
5 10 will be described with reference to FIG. 2. FIG. 2
is a front view and a block diagram of the winding unit.
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.
10 The unit control section 50 includes, for example,
a CPU and a ROM. The ROM stores a program for
controlling each configuration of the winding unit main
body 16. The CPU executes a program stored in the ROM.
Further, the unit control section 50 includes a
15 calculation section 71, a winding angle pattern storage
section 72, and a winding control section 73. Detailed
configurations of these will be described later.
The winding unit main body 16 has a configuration
arranged with a yarn unwinding assisting device 12, a
20 tension applying device 13, a splicer device (a yarn
joining device) 14, a yarn length detection sensor (a
yarn length measuring section) 61, a clearer (a yarn
quality measuring instrument) 15, and a winding section
17 in an order from a yarn supplying section 100 side on
25 which the yarn supplying bobbin 21 is supported, in a
16
yarn travelling path between the yarn supplying bobbin
21 and a winding bobbin (a winding tube) 22.
The yarn unwinding assisting device 12 is to assist
in unwinding of the yarn 20 by bringing a regulating
5 member 40 into contact with a balloon that is formed on
the yarn supplying bobbin 21 when the yarn 20 unwound
from the yarn supplying bobbin 21 is swung around, and
controlling the balloon to an appropriate size. Near
the regulating member 40, a sensor (not illustrated)
10 that detects a chase part of the yarn supplying bobbin
21 is provided. When this sensor detects a descent of
the chase part, the regulating member 40 can be lowered
following the descent, for example, by an air cylinder
(not illustrated).
15 The tension applying device 13 applies a
predetermined tension on the travelling yarn 20. The
tension applying device 13 may be a gate-type in which
movable comb teeth 37 are arranged with respect to fixed
comb teeth 36. The movable comb teeth 37 can be swung
20 by a rotary solenoid 38 so that the movable comb teeth
are engaged with or released from the fixed comb teeth.
This tension applying device 13 can apply a constant
tension on the yarn 20 to be wound, thereby improving
the quality of the package 30. Note that, for example,
25 a disc-type may be adopted instead of the gate-type for
17
the tension applying device 13 described above.
The splicer device 14 (the yarn joining device) is
to join a lower yarn on the yarn supplying bobbin 21
side and an upper yarn on the package 30 side, in yarn
5 cutting in which the clearer 15 detects a yarn defect
and the yarn 20 is cut by a cutter (a yarn cutting
section) 39, or when yarn breakage occurs during
unwinding from the yarn supplying bobbin 21. Such a
yarn joining device 14 that joins the upper yarn and the
10 lower yarn may be a mechanical type, or may be one using
a fluid such as compressed air, or the like.
The yarn length detection sensor (the yarn length
measuring section) 61 is a device that detects a yarn
length of the yarn 20 wound around the package 30 in a
15 non-contact manner. The yarn length detection sensor 61
detects an amount of hairiness of the yarn 20 and
calculates a movement amount of the yarn 20 to detect
the yarn length. Specifically, this yarn length
detection sensor 61 includes a plurality of optical
20 hairiness detecting sections, each having a light
receiving element and a light source, arranged along a
yarn travelling direction. Then, the yarn length
detection sensor 61 detects a travelled length of the
yarn 20 in accordance with a change in an output signal
25 of the hairiness detecting sections located at different
18
positions in the yarn travelling direction.
The clearer 15 includes a clearer head 49 provided
with a sensor (not illustrated) that detects a thickness
of the yarn 20, and an analyzer 53 that processes a yarn
5 thickness signal from the sensor. The clearer 15 is
configured to detect a yarn defect such as slub by
monitoring the yarn thickness signal from the sensor.
Near the clearer head 49, there is provided a cutter 39
that immediately cuts the yarn 20 when the clearer 15
10 detects a yarn defect. Note that the analyzer 53 may be
provided in the unit control section 50.
On a lower side and an upper side of the splicer
device 14, there are provided a lower yarn guide pipe 25
that catches a lower yarn on the yarn supplying bobbin
15 21 side and guides the lower yarn to the splicer device
14; and an upper yarn guide pipe 26 that catches an upper
yarn on the package 30 side and guides the upper yarn to
the splicer device 14. Further, the lower yarn guide
pipe 25 and the upper yarn guide pipe 26 are configured
20 to be swingable around shafts 33 and 35, respectively.
A suction port 32 is formed at a tip end of the lower
yarn guide pipe 25, and a suction mouth 34 is provided
at a tip end of the upper yarn guide pipe 26. An
appropriate negative pressure source is individually
25 connected to the lower yarn guide pipe 25 and the upper
19
yarn guide pipe 26, and is configured to generate a
suction flow in the suction port 32 and the suction mouth
34 to enable sucking and catching of the yarn ends of
the upper yarn and the lower yarn.
5 The winding unit main body 16 includes a cradle 23
that removably holds the winding bobbin (the winding
tube) 22, and a contact roller 29 that can be driven to
rotate while being in contact with a peripheral surface
of the winding bobbin 22 or a peripheral surface of the
10 package 30. Further, the winding unit main body 16
includes an arm-type traverse device 27 for traverse of
the yarn 20 on the surface of the package 30 near the
cradle 23, and can wind the yarn 20 around the package
30 with the traverse device 27 while traversing the yarn
15 20.
The winding section 17 includes the cradle 23, a
package drive motor (a package drive section) 41, and
the traverse device (a yarn traverse section) 27 as main
components.
20 The cradle 23 has a small-diameter side support
arm 23a that supports a small-diameter side of the
conical (tapered) winding bobbin 22, and a largediameter side support arm 23b that supports a largediameter side of the winding bobbin 22. The cradle 23
25 is configured to rotatably support the conical winding
20
bobbin 22 by holding the conical winding bobbin 22 with
the small-diameter side support arm 23a and the largediameter side support arm 23b.
The cradle 23 is configured to be swingable around
5 a rotation shaft 48, and to be able to absorb, by the
swinging of the cradle 23, an increase in a yarn layer
diameter of the package 30 due to winding of the yarn 20
on the winding bobbin 22. That is, even if the yarn
layer diameter of the package 30 changes due to winding
10 of the yarn 20, the surface of the package 30 can be
appropriately brought into contact with the contact
roller 29. Further, the cradle 23 and the traverse
device 27 can form the conical package 30 by winding the
yarn 20 around the conical winding bobbin 22, as
15 illustrated in FIG. 2.
The cradle 23 is attached with the package drive
motor 41 configured by a servo motor, and is configured
to wind the yarn 20 on the surface of the winding bobbin
22 (or the surface of the package 30) by rotationally
20 driving the winding bobbin 22 with the package drive
motor 41. A motor shaft of the package drive 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).
25 An operation of the package drive motor 41 is controlled
21
by the unit control section 50. Note that a package
drive motor control section independent of the unit
control section 50 may be provided, and the operation of
the package drive motor 41 may be controlled by the
5 package drive motor control section.
Next, the traverse device 27 will be described.
The traverse device 27 includes a traverse arm member
28, a traverse arm drive motor (a drive section) 45, and
a yarn guiding member 52 as main components. FIGS. 3
10 and 4 are a schematic side view and a front view of the
traverse device 27.
The traverse arm member 28 is configured as an
elongated arm that is turnable around a supporting shaft.
To a tip end of the traverse arm member 28, a yarn
15 hooking section 11 is connected. The yarn hooking
section 11 is formed in a hook shape so that the yarn 20
can be engaged. Whereas, a base end side of the traverse
arm member 28 is fixed to a drive shaft 45a of the
traverse arm drive motor 45. The traverse arm drive
20 motor 45 is for driving the traverse arm member 28, and
is configured by a servo motor. As the servo motor, for
example, an appropriate motor such as a brushless DC
motor, a stepping motor, or a voice coil motor can be
used.
25 The traverse device 27 is configured to cause the
22
yarn hooking section 11 to reciprocate right and left
(in a winding width direction of the package 30) to
traverse the yarn 20 on the package surface in the left
and right direction, by driving the traverse arm drive
5 motor 45 in a state where the yarn 20 is engaged with
the yarn hooking section 11, to cause the traverse arm
member 28 to perform reciprocating turning movement as
illustrated by an arrow in FIG. 4. This allows the yarn
20 to be wound around the winding bobbin 22 while the
10 yarn 20 is traversed at a predetermined winding width at
a predetermined speed, and allows formation a yarn layer
formed on the outer peripheral surface of the winding
bobbin 22, with a desired density.
The operation of the traverse arm drive motor 45
15 is controlled by the winding control section 73. However,
the operation of the traverse arm drive motor 45 may be
controlled by the unit control section 50, or may be
controlled by providing a dedicated traverse control
section. Further, the yarn guiding member 52 is arranged
20 on an upstream side of the yarn hooking section 11 in
the yarn travelling direction. This yarn guiding member
52 is for guiding the yarn 20 so that the yarn 20 can be
caught by the yarn hooking section 11, by bending a yarn
path of the yarn 20 on the upstream side in the yarn
25 travelling direction with respect to the yarn guiding
23
member 52, toward the contact roller 29.
Further, as illustrated in FIG. 3, the drive shaft
45a of the traverse arm drive motor 45 is arranged so as
to form an angle close to parallel with respect to the
5 yarn path of the yarn 20 on the upstream side of the
yarn guiding member 52 (such that an extension of the
drive shaft 45a and the yarn path of the yarn 20 form an
acute angle) when viewed in a direction of a straight
line connecting one end and the other end of a traverse
10 stroke. Further, the drive shaft 45a is arranged such
that, when viewed in a direction of a straight line
connecting one end and the other end of the traverse
stroke, an imaginary line connecting a base end of the
traverse arm member 28 and the yarn hooking section 11
15 is substantially orthogonal to an extension of the yarn
path of the yarn 20 on the upstream side of the yarn
guiding member 52. Here, the yarn path of the yarn 20
is substantially perpendicular to an installation
surface of the winding unit 10 (a horizontal plane in
20 the present embodiment). Therefore, in the automatic
winder 1 of the present embodiment, the yarn hooking
section 11 is configured to reciprocate in a plane
substantially parallel to the installation surface of
the winding unit 10 (the horizontal plane in the present
25 embodiment).
24
Next, a process performed when the automatic winder
1 completes winding of the package 30 will be described
with reference to FIGS. 4 to 9. FIG. 5 is a schematic
view for explaining bunch formation that has been
5 conventionally performed. FIG. 6 is a schematic view
for explaining a start of bunch forming control in the
present invention. FIG. 7 is a schematic view for
explaining a state where a bunch is formed by activating
the bunch forming control in the present invention. FIG.
10 8 is a schematic view for explaining a start of yarn end
centering control according to the present invention.
FIG. 9 is a schematic view for explaining an end of the
yarn end centering control according to the present
invention.
15 The winding control section 73 of the automatic
winding unit 10 of the present invention calculates a
length of the yarn wound as the package 30, on the basis
of a yarn length detected by the yarn length detection
sensor 61. When the calculated yarn length reaches a
20 length required for the package 30 (a full winding
length), the winding control section 73 causes the cutter
39 to cut the yarn, and at the same time, stops the
winding of the package 30 by sending a stop signal to
the package drive motor 41.
25 ON/OFF of execution of bunch forming control can
25
be set in advance. When execution of bunch forming
control is OFF, the package 30 having reached the full
winding length is doffed, the winding tube 22 on which
the yarn is not wound is set, and winding of a new
5 package is resumed.
When execution of the bunch forming control is ON,
the bunch formation is executed for the package 30 having
reached the full winding length. Hereinafter, the bunch
forming control of the present invention will be
10 described with reference to the schematic views and
flowcharts of FIGS. 6 to 12.
A description will be made with reference to the
flowchart of FIG. 10. As described above, the winding
control section 73 of the automatic winding unit 10 of
15 the present invention continues a winding operation
until the yarn length calculated by the yarn length
detection sensor 61 reaches the length required for the
package 30 (the full winding length) (FIG. 10, S1, S200).
When the calculated yarn length detected by the
20 yarn length detection sensor 61 has reached the length
required for the package 30 (the full winding length)
(S200, YES), the winding control section 73 causes the
cutter 39 to cut the yarn (S3), and at the same time,
stops the winding of the package 30 by sending a stop
25 signal to the package drive motor 41 (S4).
26
When execution of the bunch forming control is ON
(S201, YES), the bunch formation is executed for the
package 30 having reached the full winding length. In
the bunch forming control, yarn joining for joining the
5 cut yarns is executed first (S5), and subsequently, the
bunch forming control is executed (S6). Details of the
bunch forming control will be described later.
After execution of the bunch forming control (S6),
ON/OFF of execution of yarn end centering control (S7)
10 is checked (S202). ON/OFF of execution of the yarn end
centering control (S7) can be set in advance.
When the yarn end centering control (S7) is ON
(S202, YES), the yarn end centering control (S7) is
executed. Details of the yarn end centering control
15 will be described later. After the yarn end centering
control (S7) is completed, the winding control section
73 causes the cutter 39 to cut the yarn (S8), and at the
same time, stops winding of the package 30 by sending a
stop signal to the package drive motor 41 (S9).
20 The yarn winding device 1 of the present embodiment
can perform the following settings on the winding control
section 73. Whether or not to execute the bunch forming
control when a calculated yarn length reaches a length
required for the package 30 (the full winding length)
25 (S201). Whether or not to execute the yarn end centering
27
control after the bunch forming control (S202). Whether
or not to rotate the package in moving the yarn hooking
section 11 of the traverse arm member 28 to a bunch
forming position at a start of the bunch forming control
5 (S6). The number of bunch forming rotations. The number
of center winding rotations during centering control
(S7).
Next, the bunch forming control will be described
in detail with reference to the flowchart of FIG. 11.
10 When the bunch forming control is started, first, the
winding control section 73 applies, on the yarn 20, a
bunch formation tension required for bunch formation, by
the tension applying device 13 (S11). Next, the winding
control section 73 executes the yarn hooking operation,
15 to engage the yarn 20 with the yarn hooking section 11
of the traverse arm member 28 while rotating the package
30 in a yarn winding direction (S12).
When stop of the package rotation during movement
of the yarn hooking section 11 of the traverse arm member
20 28 to the bunch forming position is set to be enabled at
a start of the bunch forming control (S6) (S13, YES),
the winding control section 73 stops the yarn hooking
section 11 of the traverse arm member 28 at a center
position in a traverse width direction (S14), and stops
25 the rotation of the package 30 in the yarn winding
28
direction (S15).
Next, the winding control section 73 moves the yarn
hooking section 11 of the traverse arm member 28 to the
bunch forming position outside a standard traverse width
5 for winding the yarn on the surface of the package 30
(S16, FIG. 6). At this time, at a center position of
the package 30, the yarn is nipped between the surface
of the package 30 and the contact roller 29 that supports
the package 30 and assists in winding of the yarn, and
10 in this state, the yarn is moved by the yarn hooking
section 11 to a position outside the traverse width.
Even if the yarn is moved while the yarn is nipped as
described above, a new yarn is supplied from the yarn
supplying bobbin, so that the yarn does not break due to
15 an increase in tension.
The above-described operation allows a bunch
forming angle θ2, which is an angle to be formed, to be
larger than a winding angle θ at a time of normal winding.
By forming the large bunch forming angle θ2 and moving
20 the yarn from a center of the package 30 to outside of
the standard traverse width in this way, a trajectory of
the yarn becomes almost straight when the yarn falls
from the surface of the package 30 onto the winding tube
22. The yarn is dropped onto the winding tube 22 from
25 the surface of the package 30 in a nearly straight
29
trajectory (a trajectory along a radial direction of the
package). This enables prevention of movement of the
yarn to a position beyond the width of the winding tube
22 due to an excessive force, and of falling of the yarn
5 between the winding tube 22 and the small-diameter side
support arm 23a that supports the small-diameter side of
the winding tube 22. Note that, in a conventional
technique, the winding angle indicates an angle of the
yarn formed by traversing while winding the yarn with
10 the package 30. However, the bunch forming angle θ2 of
the present invention is a concept also including an
angle of the yarn formed when the yarn nipped between
the surface of the package 30 stopped as described above
and the contact roller 29 is moved outside the range of
15 the traverse width by the yarn hooking section 11.
After moving the yarn hooking section 11 of the
traverse arm member 28 to the bunch forming position
outside the standard traverse width for winding the yarn
on the surface of the package 30, the winding control
20 section 73 rotates the package 30 at a bunch forming
speed set in advance (S17). This rotation forms a bunch
300 on the winding tube 22. After driving the package
30 for a predetermined number of rotations (S18, YES),
the winding control section 73 ends the bunch forming
25 control (S6), and proceeds to the next process.
30
After the bunch forming control (S6), the winding
control section 73 checks whether or not to execute the
yarn end centering control (S7). When the execution of
the yarn end centering control (S7) is set to be enabled
5 (S202, YES), the yarn hooking section 11 of the traverse
arm member 28 is moved from the bunch forming position
outside the standard traverse width to a package center
that is a center of the standard traverse width, and
stopped (S21, FIGS. 8, 9). At this time, since the
10 package 30 is rotating at the bunch forming speed in S17,
a central bunch 400 is formed at the center of the
package 30. The yarn hooking section 11 of the traverse
arm member 28 is stopped at the package center, but the
traverse arm member 28 is retracted toward one end in
15 the package width direction after the yarn is completely
wound.
The winding control section 73 moves the yarn
hooking section 11 of the traverse arm member 28 to the
package center, drives the package 30 for a predetermined
20 number of rotations (S22, YES), and ends the bunch
forming control (S6). After the end of the bunch forming
control (S6), the winding control section 73 causes the
cutter 39 to cut the yarn (S23), and at the same time,
stops the winding of the package 30 by sending a stop
25 signal to the package drive motor 41 (S24).
31
In the present embodiment, the number of rotations
is used as a reference in the condition determination in
(S18) and (S22), but the number of rotations need not be
an integer value. For example, a fraction may be
5 included such as 2 rotations + 1/4 rotations (2.25
rotations). When the bunch 300 actually formed in the
bunch forming control (S6) is formed in a range of 1
rotation + 3/4 rotations (1.75 rotations) to 2 rotations
+ 1/4 rotations (2.25 rotations), the yarn crossing over
10 the surface of the package 30 to the winding tube 22 and
the yarn crossing over the winding tube 22 to the surface
of the package 30 are formed at an angle of 90 degrees
or less. The cross-over yarn formed in this way can be
easily picked up when the operator picks up the yarn
15 with a finger in a later process, so that an effect of
improving work efficiency is exhibited. Further, when
the operator picks up the yarn by picking up the bunch
300 formed on the winding tube 22 as well, the bunch can
be easily removed and the yarn can be picked up as long
20 as the number of rounds of bunch winding is about two.
Further, control can be performed not with the number of
rotations but with a rotation angle. When control is
performed with a rotation angle, the above range is to
be from 630 degrees to 810 degrees.
25 Instead of the number of rotations described above,
32
a rotation time of the package 30 may be used as a
reference. Furthermore, since execution of the bunch
forming control (S6) and the yarn end centering control
(S7) can be individually switched between enabled and
5 disabled, for example, the bunch 300 may be formed on
the winding tube 22 on the small-diameter side by the
bunch forming control (S6), and the process may be ended
there and shifted to a doffing process, which is the
next process.
10 According to the present invention, in the bunch
forming control (S6), the yarn is moved from within the
range of the traverse width to outside the range at the
bunch forming angle θ2 larger than the winding angle θ.
Therefore, a trajectory of the yarn is almost straight
15 when the yarn falls from the surface of the package 30
onto the winding tube 22. Allowing the yarn to fall
from the surface of the package 30 onto the winding tube
22 in a nearly straight trajectory in this way enables
prevention of movement of the yarn to a position beyond
20 the width of the winding tube 22 due to an excessive
force, and of falling of the yarn between the winding
tube 22 and the small-diameter side support arm 23a that
supports the small-diameter side of the winding tube 22.
Since the yarn is guided by the traverse arm member
25 28, the winding angle can be freely changed. This makes
33
it possible to set an optimum bunch forming angle θ2 in
accordance with a yarn type and the like, and move the
yarn from within the range of the traverse width to
outside the range.
5 In the yarn winding device, the yarn is cut by the
yarn cutting section 39 after reception of a notification
that a required length of the yarn has been wound in the
package 30, and the bunch forming control (S6) is
executed after stopping of the rotation of the package
10 30 by the winding section. Temporarily stopping the
rotation of the package 30 in this way eliminates
movement of the yarn in the winding direction, and makes
it possible to easily realize the bunch forming angle θ2
larger than the winding angle θ.
15 In the yarn winding device, it is required to
rotate the package 30 in the winding direction in order
to cause the yarn to be hooked on the yarn hooking
section 11 of the traverse arm member. However, since
the winding of the package 30 is stopped after the yarn
20 is hooked on the yarn hooking section 11, the bunch
forming angle θ2 larger than the winding angle θ can be
reliably realized. Further, it is also possible to adopt
setting of forming the bunch forming angle θ2 larger
than the winding angle θ, without stopping winding of
25 the package 30 (S13, NO). In this case, it is required
34
to move the yarn hooking section 11 of the traverse arm
member at a speed allowing the bunch forming angle θ2 to
be realized, while considering current positions of the
package 30 and the yarn hooking section 11 of the
5 traverse arm member. This operation of the yarn hooking
section 11 of the traverse arm member causes the yarn to
be moved from within the range of the traverse width to
outside the range at a speed allowing θ2 to be realized
(S19).
10 In the yarn winding device, since the yarn traverse
section 27 moves the yarn from within a range of the
traverse width to outside the range at the bunch forming
angle θ2 set in advance in a state where the winding of
the package 30 is stopped, the yarn is in a state of
15 being nipped by the contact roller 29 and the surface of
the package 30. Moving the yarn from within the range
of the traverse width to outside the range in this state
makes it possible to reliably realize the bunch forming
angle θ2 larger than the winding angle θ.
20 In this bunch forming control (S6), the bunch can
be reliably formed even on the small-diameter side of
the conical package 30 in which the yarn is likely to
move to a position beyond the width of the winding tube
22 due to an excessive force.
25 In this bunch forming control (S6), after a
35
predetermined yarn length is wound on the winding tube
22 on the small-diameter side of the package 30, the
yarn is guided by the yarn traverse section 27 from the
outside of the traverse width on the small-diameter side
5 of the conical package 30 toward a center of the traverse
width. This allows a yarn end part to be wound on the
center of the package 30. Winding the yarn end around
the surface of the package 30 enables prevention of an
occurrence of a malfunction that the yarn end becomes
10 free and comes loose to be dragged in a transport process
or the like.
By keeping the length of the yarn wound around the
center of the package 30 to the minimum necessary in the
yarn end centering control (S7), an operator can easily
15 find and draw out the yarn end.
The present invention is highly effective in
forming the bunch 300 on the small-diameter side of the
conical package 30, but the present invention is not
limited to this. The present invention is also effective
20 in forming the bunch 300 on the small-diameter side of
the conical package 30 or in forming the bunch 300 on a
cheese package 30 in which yarn layers are wound in
parallel.
Further, the present invention is not limited to
25 the automatic winder, and can be applied to other yarn
36
winding devices such as a rewinder, a spinning machine
(e.g., an air spinning machine, an open-end spinning
machine), and the like.
Further, in the embodiment described above, when
5 the calculated yarn length detected by the yarn length
detection sensor 61 has reached the length required for
the package 30 (the full winding length) (S200, YES),
the winding control section 73 causes the cutter 39 to
cut the yarn (S3). However, it is also possible to stop
10 winding of the package 30 by sending a stop signal to
the package drive motor 41 (S4) without causing the
cutter 39 to cut the yarn (S3). In this case, winding
is stopped while the yarn of the package 30 is connected
to the yarn supplying bobbin 21. Therefore, the bunch
15 forming control (S6) can be executed while the yarn
joining for joining the cut yarns (S5) is omitted.

WE CLAIM
1. A yarn winding device (1), comprising:
a yarn supplying section (100) on which a yarn
supplying bobbin (21) is supported;
5 a winding section (17) that winds a yarn drawn out
from the yarn supplying section (100) around a winding
tube (22) to form a package (30);
a yarn length measuring section (61) that counts a
length of the yarn wound by the winding section (17);
10 a yarn traverse section (27) that is provided in
the winding section (17) and guides the yarn by
reciprocating with a traverse width set in a rotation
axis direction of the package (30); and
a winding control section (73) that controls the
15 yarn traverse section (27) to cause the yarn to be wound
at a winding angle (θ) that has been set,
wherein the winding control section (73) executes,
after the yarn length measuring section (61) finishes
winding of a required length of the yarn, bunch forming
20 control (S6) of moving the yarn from within a range of
the traverse width to outside the range at a bunch
forming angle (θ2) set in advance by the yarn traverse
section (27), and winding the yarn around the winding
tube (22), and the bunch forming angle (θ2) is larger
25 than the winding angle (θ).
38
2. The yarn winding device (1) as claimed in claim
1, wherein the yarn traverse section (27) includes a
yarn hooking section (11) on which the yarn is hooked,
5 and a traverse arm member (28) having the yarn hooking
section (11) attached to one end and a drive source (45)
attached to another end.
3. The yarn winding device (1) as claimed in claim
10 1 or 2, comprising:
a yarn cutting section (39) that cuts a yarn; and
a yarn joining device (14) that joins a yarn when
the yarn is cut,
wherein the winding control section (73) causes
15 the yarn cutting section (39) to cut a yarn after
receiving a notification that a required length of the
yarn is wound in the package (30) from the yarn length
measuring section (61), causes the yarn joining device
(14) to execute a yarn joining operation of joining the
20 cut yarn after stopping rotation of the package (30) by
the winding section (17), and then executes the bunch
forming control (S6).
4. The yarn winding device (1) as claimed in claim
25 3, wherein the winding control section (73) causes the
39
winding section (17) to start winding of the package
(30) before executing the bunch forming control (S6)
after executing the yarn joining operation, executes a
yarn hooking operation for causing the connected yarn to
5 be hooked on the yarn hooking section (11) of the
traverse arm member (28), and stops winding of the
package (30) by the winding section (17).
5. The yarn winding device (1) as claimed in claim
10 4, wherein, in the bunch forming control (S6), the
winding control section (73) moves the yarn from within
the range of the traverse width to outside the range at
the bunch forming angle (θ2) set in advance by the yarn
traverse section (27), in a state where winding of the
15 package (30) by the winding section (17) is stopped.
6. The yarn winding device (1) as claimed in claim
5, wherein the bunch forming angle (θ2) is an angle
formed by moving a yarn nipped by a surface of the
20 package (30) and a contact roller (29) that supports the
package (30) and assists in winding of the yarn at a
center position of the package (30) in a direction of
the traverse width, to outside the range of the traverse
width with the yarn hooking section (11).
25
40
7. The yarn winding device (1) as claimed in any
one of claims 1 to 6, wherein
the package (30) wound by the winding section (17)
is a conical package (30), and
5 the winding control section (73) causes the yarn
traverse section (27) to guide the yarn to outside the
traverse width on a small-diameter side of the conical
package (30), in the bunch forming control (S6).
10 8. The yarn winding device (1) as claimed in claim
7, wherein, in the bunch forming control (S6), the
winding control section (73) causes the yarn traverse
section (27) to guide the yarn to outside the traverse
width on the small-diameter side of the conical package
15 (30), and, after a predetermined yarn length is wound on
the winding tube (22) on the small-diameter side of the
conical package (30), performs yarn end centering
control (S7) of causing the yarn traverse section (27)
to guide the yarn from outside the traverse width on the
20 small-diameter side of the conical package (30) toward
a center of the traverse width.
9. The yarn winding device (1) as claimed in claim
8, wherein the winding control section (73) causes the
25 yarn cutting section (39) to cut the yarn simultaneously
41
with or after completion of the yarn end centering
control (S7).
10. The yarn winding device (1) as claimed in
claim 8 or 9, wherein the winding control section (73)
5 causes the yarn traverse section (27) to guide the yarn
to outside the traverse width on the small-diameter side
of the conical package (30) in the bunch forming control
(S6), and rotates the conical package (30) with any
number of rotations in a range of 1.75 rotations to 2.25
10 rotations when a predetermined yarn length is wound on
the winding tube (22) on the small-diameter side of the
conical package (30).
11. A bunch forming method for forming a bunch on
a winding tube (22) of a package (30) wound with a yarn,
15 the bunch forming method comprising:
a first process of winding a required length as
the package (30);
a second process of causing a cutter to cut the
yarn and simultaneously stopping winding of the package
20 (30);
a third process of connecting the cut yarn;
a fourth process of engaging the yarn with a yarn
hooking section (11) of a traverse arm member (28) while
rotating the package (30) in a yarn winding direction;
25 a fifth process of stopping the yarn hooking
42
section (11) of the traverse arm member (28) at a center
position in a traverse width direction, and stopping
rotation of the package (30) in the yarn winding
direction; and
5 a sixth process of moving the yarn hooking section
(11) of the traverse arm member (28) supplemented with
a yarn to a bunch forming position outside a standard
traverse width for winding the yarn on a surface of the
package (30).
10 12. The bunch forming method according to claim
11, comprising a seventh process of moving the yarn
hooking section (11) of the traverse arm member (28)
from the bunch forming position outside the standard
traverse width to a package center that is the standard
15 traverse width.