YARN WINDING DEVICE
BACKGROUND OF THE INVENTION
1. Field of the Invention
5 The present invention relates to a yarn winding
device including a yarn storage roller.
2. Description of the Related Art
Conventionally, in a yarn winding device such as an
10 automatic winder, a spinning machine, and the like, there
is known a configuration of winding a yarn around a
periphery of a rotating yarn storage roller to temporarily
store the yarn. The yarn winding device including this type
of yarn storage roller is disclosed in Japanese Unexamined
15 Patent Publication No. 2014-20000.
The yarn winding device of Japanese Unexamined Patent
Publication No. 2014-20000 includes a yarn feeding device,
a drum (yarn storage roller), an arm (tension applying
section) , and a winding section. The drum stores the yarn
20 pulled out from the yarn supplying device. The arm is
arranged in proximity to the drum to apply tension to the
yarn supplied from the drum to the winding section. The
drum and the arm are driven with different motors, and are
independently controlled. Specifically, the motor that
25 drives the arm controls the arm to rotate at a constant
torque.
However, in Japanese Unexamined Patent Publication
No. 2014-20000, a sensor adapted to detect the tension of
the yarn is not disclosed, and the tension of the yarn is
30 not taken into consideration in the control of the motor
that drives the arm. In Japanese Unexamined Patent
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Publication No. 2014-20000 described above, the arm is
merely rotated at a constant torque, and thus the arm may
not be controlled in accordance with a state of the yarn
as a yarn speed becomes faster.
5 As a result, the tension applied to the yarn becomes
difficult to be held at an optimum value, and the yarn may
be broken when the tension applied to the yarn becomes
strong. In particular, in the automatic winder and the like
in which the speed of the yarn is high, a fluctuation in
10 the tension generated by the traversing of the yarn is large,
and this fluctuation easily causes yarn breakage. In this
case, the yarn joining operation needs to be carried out
by the yarn joining device and the like. Furthermore, when
the tension applied to the yarn becomes weak, the yarn may
15 be detached from the arm. In this case, the yarn wound
around the drum is loosened, and the yarn wound around the
drum may bulge out to an outer side of the drum. When such
a phenomenon occurs, the operator needs to carry out the
task of removing the yarn from the drum.
20 Thus, in the method for controlling the arm (tension
applying section) of Japanese Unexamined Patent
Publication No. 2014-20000, the winding is easily
interrupted particularly when the yarn is wound at high
speed, and hence production efficiency of the package may
25 be lowered. As the tension to be applied to the yarn
fluctuates, quality of the package is also lowered.
BRIEF SUMMARY OF THE INVENTION
The present invention has been made in view of the
30 above circumstances, and it is a main object of the present
invention to provide a configuration of carrying out a
3 / 2G
control to apply a desired tension to a yarn to be wound
in a winding device including a yarn storage roller.
The problems to be solved by the present invention
are as described above, and the means for solving such
5 problems and the effects thereof will be described below.
According to an aspect of the present invention, a
yarn winding device having the following configuration is
provided. In other words, the yarn winding device includes
a yarn supplying section, a yarn storage roller, a package
10 forming section, a tension measuring device, a tension
applying section, a second driving section, and a control
section. The yarn supplying section is adapted to supply
the yarn. The yarn storage roller is adapted to pull out
the yarn from the yarn supplying section and wind the yarn
15 around an outer circumferential surface to store the yarn
when the yarn storage roller is rotatably driven by the
first driving section. The package forming section is
adapted to pull out the yarn stored on the yarn storage
roller to form a package. The tension measuring device is
20 adapted to measure a tension of the yarn pulled out from
the yarn storage roller by the package forming section. The
tension applying section is arranged downstream in a yarn
travelling direction of the yarn storage roller and adapted
to make contact with the yarn to apply tension to the yarn.
25 The second driving section is adapted to rotatably drive
the tension applying section. The control section is
adapted to feedback control the second driving section
based on a measurement result of the tension measuring
device to adjust an amount of tension applied by the tension
30 applying section.
4/26
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic side view of a winding unit
arranged in an automatic winder according to one embodiment
of the present invention;
5 FIG. 2 is a schematic view illustrating a
configuration of a yarn storage device;
FIG. 3 is a control block diagram for feedback control
of a roller driving section based on the tension;
FIG. 4 is a schematic view illustrating a
10 configuration of a yarn storage device according to a first
alternative embodiment;
FIG. 5 is a schematic view illustrating a
configuration of a yarn storage device according to a second
alternative embodiment; and
15 FIG. 6 is a schematic view illustrating a
configuration of a yarn storage device according to a third
alternative embodiment.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
20 Embodiments of the invention will be described below.
First, an outline of an automatic winder (yarn winding
device) will be described with reference to FIG. 1. The
automatic winder has a configuration in which a plurality
of winding units 2 are arranged in line. The automatic
25 winder includes a machine management device (not
illustrated) adapted to collectively manage the winding
units 2, and a blower box (not illustrated) including a
compressed air source and a negative pressure source.
As illustrated in FIG. 1, the winding unit 2 mainly
30 includes a bobbin supporting section (yarn supplying
section) 7 and a winding section (package forming section)
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8. The winding unit 2 is configured to unwind a yarn (spun
yarn) 20 of a yarn supplying bobbin 21 supported by the
bobbin supporting section 7 and rewind a package 30.
The bobbin supporting section 7 is configured to be
5 able to hold the yarn supplying bobbin 21 in a substantially
upright state. The bobbin supporting section 7 is
configured to be able to discharge the empty yarn supplying
bobbin 21. The winding section 8 includes a cradle 23
configured to be able to attach the winding bobbin 22, and
10 a traverse drum 24 for traversing the yarn 20 and driving
the winding bobbin 22.
The traverse drum 24 is arranged facing the winding
bobbin 22, and the winding bobbin 22 is rotated by driving
and rotating the traverse drum 24. The yarn 20 stored in
15 a yarn storage device 18, to be described later, thus can
be wound around the winding bobbin 22. A traverse groove
(not illustrated) is formed on an outer circumferential
surface of the traverse drum 24, and the yarn 20 is traversed
by the traverse groove at a predetermined width. According
20 to the configuration described above, the yarn 20 can be
wound around the winding bobbin 22 while being traversed,
and the package 30 having a predetermined length and a
predetermined shape can be obtained. In the following
description, "upstream" and "downstream" refers to the
25 upstream and the downstream when viewed in a travelling
direction of the yarn.
The winding unit 2 includes an unwinding assisting
device 10, a lower yarn blow-up section 11, a gate type
tension applying device 12, an upper yarn catching section
30 13, a yarn joining device 14, a yarn trap 15, a cutter 16,
a clearer (yarn defect detection device) 17, an upper yarn
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pull-out section 35, and the yarn storage device 18 arranged
in this order from the bobbin supporting section 7 towards
the winding section 8 on a yarn travelling path between the
bobbin supporting section 7 and the winding section 8.
5 The unwinding assisting device 10 causes a movable
member 10a to make contact with a balloon formed at an upper
part of the yarn supplying bobbin 21 when the yarn 20 unwound
from the yarn supplying bobbin 21 is swung around, and
controls the balloon to an appropriate size to assist the
10 unwinding of the yarn 20.
The lower yarn blow-up section 11 is an air sucker
device arranged between the bobbin supporting section 7 and
the yarn joining device 14, and is configured to feed a lower
yarn from the yarn supplying bobbin 21 towards the yarn
15 joining device 14 during the yarn joining operation.
The gate type tension applying device 12 applies a
predetermined tension to the travelling yarn 20. The gate
type tension applying device 12 of the present embodiment
is configured as a gate type in which movable comb teeth
20 are arranged with respect to fixed comb teeth. The comb
teeth on the movable side are configured to be swingable
by a rotary solenoid so that the comb teeth can be in the
meshed state or the released state. The configuration of
the gate type tension applying device 12 is not limited
25 thereto, and may be a disc type tension applying device,
for example.
The upper yarn catching section 13 is arranged
between the yarn joining device 14 and the bobbin supporting
section 7. The upper yarn catching section 13 is connected
30 to a negative pressure source (not illustrated), and can
generate a suction airflow during the yarn joining
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operation.
The yarn trap 15 is arranged between the yarn joining
device 14 and the yarn storage device 18. The distal end
of the yarn trap 15 is formed as a tubular member and is
5 arranged close to the travelling path of the yarn 20, and
is connected to the negative pressure source (not
illustrated). According to such a configuration, the
suction airflow can be generated at the distal end of the
yarn trap 15 to suck and remove contaminants such as fluffs
10 attached to the travelling yarn 20.
The clearer 17 is configured to detect the yarn defect
such as slub by monitoring a yarn thickness of the yarn 20.
When detecting the yarn defect, the clearer 17 transmits
a disconnecting signal instructing the cutting and removal
15 of the yarn defect to a control section 60 and the like.
A cutter 16 for immediately cutting the yarn 20 according
to the disconnecting signal is arranged in proximity to the
clearer 17.
The yarn joining device 14 joins the lower yarn from
20 the yarn supplying bobbin 21, and the upper yarn from the
yarn storage device 18, when the yarn 20 between the yarn
supplying bobbin 21 and the package 30 is in the
disconnected state after yarn breakage in which the clearer
17 detects the yarn defect and the cutter 16 cuts the yarn
25 20, after yarn breakage during unwinding of the yarn 20 from
the yarn supplying bobbin 21, or at the time of replacing
the yarn supplying bobbin 21. The yarn joining device 14
may be a type that uses a fluid such as compressed air, or
may be a mechanical type.
30 The upper yarn pull-out section 35 is an air sucker
device, and pulls out the upper yarn from the yarn storage
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device 18 and feeds the upper yarn towards a deflection
guide member 36.
When carrying out the yarn joining operation in
replacing the yarn supplying bobbin 21, the upper yarn from
5 the yarn storage device 18 is fed to the deflection guide
member 36 by the upper yarn pull-out section 35. The
deflection guide member 36 discharges the fed upper yarn
from the lower end portion. The yarn discharged by the
deflection guide member 36 is sucked by the upper yarn
10 catching section 13. The upper yarn can be taken out from
a slit (not illustrated) formed in the deflection guide
member 36 as the upper yarn catching section 13 sucks the
upper yarn, so that the upper yarn can be guided to the yarn
joining device 14.
15 The lower yarn fed by the lower yarn blow-up section
11 is sucked by the yarn trap 15. The lower yarn is thereby
guided to the yarn joining device 14. The yarn joining
operation is carried out in such a manner. In the present
embodiment, the yarn defect is removed mainly by the clearer
20 17, the upper yarn catching section 13, the yarn trap 15,
and the yarn joining device 14, and hence such devices
correspond to "yarn defect removing device".
The yarn storage device 18 is configured to be able
to temporarily store the yarn 20 unwound from the yarn
25 supplying bobbin 21. Since the yarn storage device 18 is
interposed between the bobbin supporting section 7 and the
winding section 8, and a prescribed amount of the yarn 20
is stored on the yarn storage device 18, the winding section
8 can wind the yarn 20 stored on the yarn storage device
30 18 even if the unwinding of the yarn from the yarn supplying
bobbin 21 is interrupted (e.g., during yarn joining
9/26
operation) for some reason. Thus, the winding of the yarn
20 into the package 30 can be continued.
Thus, since the winding operation in the winding
section 8 is not interrupted by the yarn joining operation
5 and the like, the package 30 can be produced stably at high
speed. Furthermore, since the yarn 20 is not sucked and
caught from the package 30 for each yarn joining operation
as in the conventional yarn winding device, disturbance can
be prevented from occurring at the surface of the package
10 30. Moreover, since the occurrence of yarn breakage in the
winding section 8 is reduced, falling of the yarn 20 onto
the end face of the package 30 or occurrence of a failure
in the winding shape can be prevented.
A first guide section 41, a second guide section 42,
15 and a tension measuring device 43 are arranged on the
downstream of the yarn storage device 18.
The first guide section 41 converges the yarn 20
pulled out from the yarn storage device 18 so as to guide
the yarn 20 to one area. The second guide section 42 is
20 arranged downstream of the first guide section 41. The
second guide section 42 forms a traverse supporting point
of the yarn 20 to be wound in the winding section 8.
The tension measuring device 43 is arranged between
the first guide section 41 and the second guide section 42.
25 The tension measuring device 43 is configured as a load cell
type sensor. If the yarn 20 travels while being pushed
against the contacting portion of the tension measuring
device 43, distortion occurs in the load cell portion
according to the tension of the yarn 20 and an electric
30 signal corresponding to the distortion is output from a
distortion gauge.
10 / 26
A magazine type bobbin supplying device 26 is
arranged on the front side of the winding unit 2 . The bobbin
supplying device 2 6 includes a rotary magazine part 2 7 . The
magazine part 27 is configured to be able to hold a plurality
5 of spare yarn supplying bobbins 21. The bobbin supplying
device 26 intermittently rotatably drives the magazine part
27 to supply a new yarn supplying bobbin 21 to the bobbin
supporting section 7.
Next, with reference to FIG. 2, the yarn storage
10 device 18 will be described in detail. The yarn storage
device 18 includes a yarn storage roller 51, a roller
driving section (first driving section) 52, a yarn hooking
arm (tension applying section) 53, a transmission mechanism
54, and an arm driving section (second driving section) 55.
15 The yarn storage roller 51 is formed as a
substantially cylindrical member, and is configured to
store the yarn 20 by winding the yarn 20 around the outer
circumferential surface thereof.
The roller driving section 52 rotatably drives the
20 yarn storage roller 51 with a center axis line thereof as
a center. Specifically, a belt 70 is wound around an output
shaft 52a of the roller driving section 52 and a coupling
member 51a fixed to the inner surface of the yarn storage
roller 51, and the yarn storage roller 51 can be rotated
25 by rotating the output shaft 52a. The operation of the
roller driving section 52 is controlled by the control
section 60. The roller driving section 52 is a servo motor,
a stepping motor, or the like.
The arm driving section 55 rotatably drives the yarn
30 hooking arm 53 when the driving force is transmitted by the
transmission mechanism 54. The transmission mechanism 54
11 / 26
of the present embodiment mainly includes a shaft 54a (yarn
storage roller rotation shaft) , and the shaft 54a transmits
the driving force. According to such a configuration, the
yarn hooking arm 53 can be rotatably driven around the same
5 rotation axis as the yarn storage roller 51. The operation
of the arm driving section 55 is controlled independently
from the roller driving section 52 by the control section
60. Therefore, in the present embodiment, the rotation
speeds of the yarn storage roller 51 and the yarn hooking
10 arm 53 can be differed. The arm driving section 55 is a
servo motor, a stepping motor, or the like.
Next, a description will be made on the control
carried out by the control section 60 on the arm driving
section 55 with reference to FIG. 3.
15 Each winding unit 2 includes the control section 60.
The control section 60 is configured by hardware such as
a CPU, a ROM, and a RAM (not illustrated) , and software such
as the control program stored in the RAM. The hardware and
the software cooperatively operate to control each
20 configuration of the winding unit 2. As illustrated in FIG.
3, the control section 60 includes, as a configuration for
controlling the arm driving section 55, a deviation
calculating section 61, a PID control value determining
section 62, and a limiter 63.
25 The deviation calculating section 61 of the control
section 60 is input with a tension measurement value
measured by the tension measuring device 43. Furthermore,
a tension target value derived from the winding conditions
such as the type of yarn 20 and the yarn travelling speed
30 is input to the deviation calculating section 61. The
deviation calculating section 61 calculates the deviation
12 / 26
of the two input values, and outputs the calculated
deviation to the PID control value determining section 62.
The PID control value determining section 62
calculates a control value for controlling the torque of
5 the arm driving section 55 by a known PID control based on
a deviation, time integral of the deviation, and time
derivative of the deviation. The control value may be
calculated based only on the deviation, and the control
value may be calculated based only on the deviation and the
10 time integral thereof. The feedback control other than the
PID may be used. The PID control value determining section
62 outputs the control value calculated as above to the
limiter 63.
The limiter 63 defines an upper limit of the control
15 value of the arm driving section 55. When the control value
input from the PID control value determining section 62 is
greater than or equal to a predetermined threshold, the
limiter 63 outputs the relevant threshold to the arm driving
section 55 as the control value. When the control value
20 input from the PID control value determining section 62 is
smaller than the predetermined threshold, the limiter 63
outputs the input value as it is.
The control value calculated as above is input to the
arm driving section 55, and the torque of the arm driving
25 section 55 is adjusted based on the control value. The
control section 60 carries out the feedback control as
necessary, so that even if the travelling speed of the yarn
is high, the yarn hooking arm 53 can apply a desired tension
to the yarn 20.
30 As described above, the yarn winding device of the
present embodiment includes the bobbin supporting section
13 / 26
7, the yarn storage roller 51, the winding section 8, the
tension measuring device 43, the yarn hooking arm 53, the
arm driving section 55, and the control section 60. The
bobbin supporting section 7 can supply the yarn 20. The
5 yarn storage roller 51 is rotatably driven by the roller
driving section 52, so that the yarn 20 is pulled out from
the yarn supplying bobbin 21 of the bobbin supporting
section 7 and the yarn 20 is stored on the surface. The
winding section 8 pulls out the yarn 20 stored on the yarn
10 storage roller 51 to form the package 30. The tension
measuring device 43 measures the tension of the yarn 20
pulled out from the yarn storage roller 51. The yarn
hooking arm 53 is arranged downstream in the yarn travelling
direction of the yarn storage roller 51, and makes contact
15 with the yarn 20 to apply tension to the yarn 20. The arm
driving section 55 rotatably drives the yarn hooking arm
53. The control section 60 feedback controls the arm
driving section 55 based on the measurement result of the
tension measuring device 43 to adjust the amount of tension
20 applied by the yarn hooking arm 53. The yarn travelling
direction of the yarn storage roller 51 in the present
invention is a direction in which the yarn wound around the
outer circumferential surface of the yarn storage roller
51 advances by being pushed by the newly wound yarn, and
25 is the same direction as the axial direction of the shaft
54a.
Since the tension on the downstream of the yarn
storage roller 51 is measured, and the arm driving section
55 is controlled based on such a measurement result, the
30 tension of the yarn 20 to be wound into the package 30 becomes
the desired tension. Thus, the quality of the package 30
14 / 26
can be improved while the interruption of the winding of
the yarn 20 is prevented.
Next, a description will be made on a first
alternative embodiment of the above described embodiment
5 with reference to FIG. 4. In the description of the first
alternative embodiment and the subsequent alternative
embodiments, the same reference numerals are denoted in the
drawings on the members same as or similar to the embodiment
described above, and the description thereof may be
10 omitted.
A yarn storage device 18a of the first alternative
embodiment includes a resistance torque generating section
56. The resistance torque generating section 56 is a load
such as a torque limiter attached between a shaft 54a and
15 at least an inner surface of the yarn storage roller 51.
The resistance torque generating section 56 thereby
generates a torque against the relative rotation of the yarn
storage roller 51 and the yarn hooking arm 53, and
integrally rotates. The yarn hooking arm 53 can be
20 relatively rotated with respect to the yarn storage roller
51 by driving the arm driving section 55 at greater than
or equal to the above torque.
For example, when the fluctuation of the tension is
small, the operation of the arm driving section 55 is
25 stopped and the yarn storage roller 51 and the yarn hooking
arm 53 are integrally rotated by the torque of the
resistance torque generating section 56. When the
fluctuation of the tension is large, the fluctuation of the
tension can be prevented by driving the arm driving section
30 55 and relatively rotating the yarn hooking arm 53.
Next, a description will be made on a second
15 / 26
alternative embodiment with reference to FIG. 5.
A yarn storage device 18b of the second alternative
embodiment includes the resistance torque generating
section 56, similarly to the first alternative embodiment.
5 The transmission mechanism 54 includes a clutch 54b in
addition to the shaft 54a. The clutch 54b is a constituent
element of the transmission mechanism 54. The clutch 54b
switches the transmission or cutting of the driving force
from the arm driving section 55 to the yarn hooking arm 53.
10 Thus, the yarn storage roller 51 and the yarn hooking
arm 53 can be integrally rotated without stopping the drive
of the arm driving section 55 as in the first alternative
embodiment. Therefore, for example, the yarn hooking arm
53 can be immediately decelerated by rotating the shaft 54a
15 at a rotation speed slightly lower than the yarn storage
roller 51 and connecting the clutch 54b when desiring to
decelerate the yarn hooking arm 53.
Next, a description will be made on a third
alternative embodiment with reference to FIG. 6.
20 The transmission mechanism 54 of the yarn storage
device 18c of the third alternative embodiment includes a
torque limiter 54c in addition to the shaft 54a. The torque
limiter 54c is attached to connect the shaft 54a divided
in half. The two shafts 54a integrally rotate when a torque
25 smaller than a predetermined value is applied by the torque
limiter 54c, and the two shafts 54a relatively rotate when
a torque greater than or equal to the predetermined value
is applied.
Thus, an excessive tension can be more reliably
30 prevented from being applied on the yarn 20 and breaking
the yarn 20.
16 / 26
The preferred embodiment and the alternative
embodiments of the present invention have been described
above, but the above-described configurations may be
modified as below.
5 In the description made above, the roller driving
section 52 and the arm driving section 55 have at least one
part arranged inside the yarn storage roller 51, but the
roller driving section 52 and the arm driving section 55
may be arranged outside the yarn storage roller 51. The
10 yarn hooking arm 53 may be arranged outside the yarn storage
device 18.
The tension measuring device 43 may be, for example,
a tension sensor using a spring and/or a piezoelectric
element, instead of a load cell type.
15 In the description made above, the control section
60 adjusts the torque of the arm driving section 55 based
on the measured tension, but the position (rotation angle)
and the speed (rotation speed) may be adjusted instead of
the torque.
20 In the description made above, an example of applying
the present invention to an automatic winder has been
described, but the present invention may be applied to other
yarn winding devices such as a spinning machine. When the
present invention is applied to the spinning machine, a
25 spinning section adapted to spin the spun yarn from the
sliver corresponds to the yarn supplying section.
In the description made above, an example of
supplying the yarn supplying bobbin 21 from the magazine
type bobbin supplying device 26 has been described, but a
30 yarn winding device including a tray type bobbin supplying
device may be adopted.
17 / 26
Therefore, the tension on the downstream of the yarn
storage roller is measured and the second driving section
is controlled based on such a measurement result, and hence
a desired tension can be applied to the yarn to be wound
5 into the package. Thus, the quality of the package can be
improved while the interruption of the winding of the yarn
is prevented.
The yarn winding device described above preferably
has the following configuration. In other words, the yarn
10 winding device includes a first guide section and a second
guide section. The first guide section is arranged
downstream of the yarn storage roller and adapted to
converge the yarn pulled out from the yarn storage roller.
The second guide section is arranged downstream of the first
15 guide section and adapted to form a traverse supporting
point of the yarn wound by the package forming section. The
tension measuring device is arranged on a yarn path between
the first guide section and the second guide section.
Thus, the fluctuation in the tension of the yarn
20 between the first guide section and the second guide section
is small, and the tension can be accurately measured.
In the yarn winding device described above, the
control section preferably adjusts the amount of tension
applied by the tension applying section by adjusting a
25 torque of the second driving section based on the
measurement result of the tension measuring device.
The fluctuation in the tension thus can be more
reliably suppressed compared to the configuration of
controlling the position (rotation angle) of the tension
30 applying section by the feedback control.
The yarn winding device described above preferably
18 / 26
has the following configuration. In other words, the yarn
storage roller rotates with a yarn storage roller rotation
shaft as a center. The tension applying section rotates
with the yarn storage roller rotation shaft as the center.
5 Thus, the yarn storage roller and the tension
applying section are coaxially controlled, so that the
fluctuation in the tension of the yarn can be prevented with
a simple control.
The yarn winding device described above preferably
10 includes a resistance torque generating section adapted to
generate a torque against a relative rotation of the yarn
storage roller and the tension applying section.
Thus, for example, at the time of low speed when the
tension is less likely to fluctuate or when the speed is
15 not changed, the yarn storage roller and the tension
applying section can be integrally rotated with a simple
control.
The yarn winding device described above preferably
has the following configuration. In other words, the yarn
20 winding device includes a transmission mechanism adapted
to transmit a driving force of the second driving section
to the tension applying section. The transmission
mechanism includes a clutch adapted to switch transmission
or cutting of the driving force from the second driving
25 section to the tension applying section.
Thus, a state of integrally rotating the arm and the
yarn storage roller and a state of independently rotating
the arm and the yarn storage roller by the driving force
of the second driving section can be easily switched.
30 The yarn winding device described above preferably
has the following configuration. In other words, the yarn
19 / 26
winding device includes a transmission mechanism adapted
to transmit a driving force of the second driving section
to the tension applying section. The transmission
mechanism includes a torque limiter adapted to prevent an
5 excessive driving force from being transmitted from the
second driving section to the tension applying section.
Thus, an excessive tension can be more reliably
prevented from being applied to the yarn and breaking the
yarn.
10 The yarn winding device described above preferably
has the following configuration. In other words, the yarn
supplying section is supported such that the yarn is
supplied from a yarn supplying bobbin, around which the yarn
produced by a spinning device is wound. A yarn defect
15 removing device adapted to remove a yarn defect of the yarn
supplied from the yarn supplying section is arranged
between the yarn supplying section and the yarn storage
roller.
Thus, even when the rotation of the yarn storage
20 roller is stopped to remove the yarn defect contained in
the yarn supplying bobbin, the winding of the package can
be continued at an optimum tension while measuring the
tension of the yarn wound into the package. Furthermore,
even if an unwinding resistance of the yarn supplying bobbin
25 becomes large and a rotation speed of the yarn storage
roller is low, the winding of the package can be continued
at an optimum tension.
The yarn winding device described above preferably
has the following configuration. In other words, the yarn
30 supplying section is a spinning section adapted to spin a
yarn. A yarn defect removing device adapted to remove a
20 / 26
yarn defect of the yarn supplied from the yarn supplying
section is arranged between the yarn supplying section and
the yarn storage roller.
Thus, even in the case of winding the yarn spun by
5 the spinning section, a desired tension can be applied to
the yarn.

WE CLAIM:
1. A yarn winding device comprising:
a yarn supplying section adapted to supply a yarn;
5 a yarn storage roller adapted to pull out the yarn
from the yarn supplying section and wind the yarn around
an outer circumferential surface to store the yarn when the
yarn storage roller is rotatably driven by a first driving
section;
10 a package forming section adapted to pull out the yarn
stored on the yarn storage roller to form a package;
a tension applying section arranged downstream in a
yarn travelling direction of the yarn storage roller and
adapted to make contact with the yarn to apply tension to
15 the yarn;
a second driving section adapted to rotatably drive
the tension applying section; characterized by
a tension measuring device adapted to measure a
tension of the yarn pulled out from the yarn storage roller
20 (51) by the package forming section;
and
a control section adapted to feedback control the
second driving section based on a measurement result of the
tension measuring device to adjust an amount of tension
25 applied by the tension applying section.
2. The yarn winding device according to claim 1,
characterized by further comprising:
a first guide section arranged downstream of the yarn
30 storage roller and adapted to converge the yarn pulled out
from the yarn storage roller; and
22 / 26
a second guide section arranged downstream of the
first guide section and adapted to form a traverse
supporting point of the yarn wound by the package forming
section, wherein
5 the tension measuring device is arranged on a yarn
path between the first guide section and the second guide
section.
3. The yarn winding device according to claim 1 or
2, characterized in that
the control section adjusts the amount of tension
applied by the tension applying section by adjusting a
torque of the second driving section based on the
measurement result of the tension measuring device.
4. The yarn winding device according to any one of
claims 1 to 3, characterized in that
the yarn storage roller rotates with a yarn storage
roller rotation shaft as a center, and
the tension applying section rotates with the yarn
storage roller rotation shaft as the center.
5. The yarn winding device according to claim 4,
characterized by further comprising:
25 a resistance torque generating section adapted to
generate a torque against a relative rotation of the yarn
storage roller and the tension applying section.
6. The yarn winding device according to claim 5,
30 characterized by further comprising:
a transmission mechanism adapted to transmit a
23 / 26
10
15
20
driving force of the second driving section to the tension
applying section, wherein
the transmission mechanism includes a clutch adapted
to switch transmission or cutting of the driving force from
5 the second driving section to the tension applying section.
7. The yarn winding device according to any one of
claims 1 to 4, characterized by further comprising:
a transmission mechanism adapted to transmit a
10 driving force of the second driving section to the tension
applying section, wherein
the transmission mechanism includes a torque limiter
adapted to prevent an excessive driving force from being
transmitted from the second driving section to the tension
15 applying section.
8 . The yarn winding device according to any one of
claims 1 to 7, characterized in that
the yarn supplying section is supported such that the
20 yarn is supplied from a yarn supplying bobbin, around which
the yarn produced by a spinning device is wound, and
a yarn defect removing device adapted to remove a yarn
defect of the yarn supplied from the yarn supplying section
is arranged between the yarn supplying section and the yarn
25 storage roller.
9. The yarn winding device according to any one of
claims 1 to 7, characterized in that
the yarn supplying section is a spinning section
30 adapted to spin a yarn, and
a yarn defect removing device adapted to remove a yarn
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defect of the yarn supplied from the yarn supplying section
is arranged between the yarn supplying section and the yarn
storage roller.