YARN WINDING DEVICE
BACKGROUND OF THE INVENTION
1. Field of the Invention
5 The present invention relates to a yarn winding
device including a traverse detection section adapted to
detect a yarn to be traversed.
2. Description of the Related Art
10 The yarn winding device such as an automatic winder
and the like includes a traverse device adapted to
reciprocate a yarn in a winding width direction of a winding
bobbin. The yarn winding device winds the yarn around the
rotating winding bobbin while traversing the yarn with the
15 traverse device. This type of yarn winding device includes
a traverse detection section adapted to detect the yarn to
be traversed, and whether the traversing is being
appropriately carried out is determined based on the
detection result of the traverse detection section. This
20 type of yarn winding device is disclosed in Japanese
Unexamined Patent Publication No. 2013-63840 and Japanese
Unexamined Patent Publication No. 2012-153476.
The yarn winding device of Japanese Unexamined Patent
Publication No. 2013-63840 includes a cover section
25 arranged to surround the yarn to be traversed, and the
traverse detection section (yarn detection sensor) is
arranged in the cover section. The traverse detection
section detects the traversing of the yarn by emitting light
such as an infrared light, and receiving the light reflected
30 by the yarn. More specif ically, as illustrated in FIG . 7(b),
a threshold is determined in advance, and determination is
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made that the yarn traversed when light exceeding the
threshold is input.
The yarn winding device of Japanese Unexamined Patent
Publication No. 2012-153476 has the traverse detection
5 section arranged at the center in a package width direction
of the cover section. The traverse detection section of
Japanese Unexamined Patent Publication No. 2012-153476
includes a light emitting section (light source section)
adapted to emit light, a light receiving section adapted
10 to receive the light emitted by the light emitting section,
and the cover section (guiding plate) . The light receiving
section normally receives the light emitted by the light
emitting section and reflected by the cover section. While
traversing the yarn to be traversed, the emitted light is
15 blocked by the yarn, and hence the light receiving section
receives light with reduced light receiving amount. The
traverse detection section thereby detects the traversing
of the yarn.
However, in the configuration of Japanese Unexamined
20 Patent Publication No. 2013-63840, the light reflected by
the yarn is detected, and hence it is difficult to detect
a color yarn (especially black yarn) that absorbs light (see
black yarn of FIG. 7 (b) ) . If the threshold value is lowered
so that the black yarn can be detected, false detection may
25 easily occur. Furthermore, since the light reflected by
the yarn is weak, a strong light needs to be irradiated in
the configuration of Japanese Unexamined Patent
Publication No. 2013-63840. The lifespan of the traverse
detection section thus becomes short.
30 In Japanese Unexamined Patent Publication No.
2012-153476, the traverse detection section is assumed to
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be arranged at the center in the package width direction.
In this case, even if a winding operation is executed in
a traverse region smaller than a set traverse region, for
example, such a case may not be detected. Furthermore,
5 since straight winding tends to easily occur at the center
in the package width direction, even if the traverse
detection section detects the yarn, the traverse detection
section may not be able to detect that the straight winding
has occurred.
10
BRIEF SUMMARY OF THE INVENTION
The present invention has been made in view of the
above circumstances, and a main object thereof is to provide
a yarn winding device that can easily detect various color
15 yarns and that can reliably detect that the traverse region
is small, the straight winding has occurred, and the like.
The problems to be solved by the present invention
are as described above, and the means for solving such
problems and the effects thereof will be described below.
20 -According to an aspect of the present invention,
there is provided a yarn winding device having the following
configuration. In other words, the yarn winding device
includes a winding section and a traverse detection section
The winding section winds the yarn while traversing the yarn
25 The traverse detection section is arranged in a traverse
region where the yarn is traversed by the winding section
to detect the yarn to be traversed. The traverse detection
section includes a light emitting section, a reflecting
section adapted to reflect light emitted from the light
30 emitting section, and a light receiving section adapted to
receive the light reflected by the reflecting section. The
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light receiving section and the reflecting section are
arranged at positions sandwiching a yarn path, through
which the yarn to be traversed passes, and at positions of
detecting any one of two regions at both ends of three
5 regions obtained by equally dividing the traverse region
in a package width direction.
The light emitted by the light emitting section and
reflected by the reflecting section is thus blocked by the
yarn to be traversed, so that the light amount is lowered.
10 As a result, the yarn to be traversed can be detected
regardless of the color of the yarn. Furthermore, since
the traverse detection section is arranged in an end region
of the traverse region, drawbacks can be accurately
detected, such as the state in which the traverse region
15 becomes small, the straight winding in which the yarn is
wound at one part of the package without being traversed,
and the drum winding in which the yarn is wound around the
drum.
In the yarn winding device described above, the light
20 emitting section and the light receiving section are
preferably arranged on a same side with respect to the yarn
path, through which the yarn to be traversed passes.
If the light emitting section and the light receiving
section are arranged on the same side, the light irradiated
25 from the light emitting section is blocked by the yarn, and
the reflected light from the reflecting section is also
blocked by the yarn. Thus, the traverse detection section
can reliably detect the yarn to be traversed. Compared to
the traverse detection section in which the light emitting
30 section and the light receiving section are arranged with
the yarn path therebetween, the size can be reduced and the
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traverse detection section can be prevented from becoming
a hindrance in terms of layout.
In the yarn winding device described above, the light
emitting section and the light receiving section are
5 preferably arranged along a travelling direction of the
yarn to be detected.
Thus, the light emitted from the light emitting
section is blocked by the yarn, and at the same time, the
light reflected by the reflecting section is blocked by the
10 yarn. Therefore, the light amount received by the light
receiving section is greatly lowered, whereby the passing
of the yarn can be more reliably detected.
In the yarn winding device described above, the light
emitting section and the light receiving section are
15 preferably integrally configured.
The attachment operation of the light emitting
section and the light receiving section thus can be easily
carried out. Furthermore, the error in the positional
relationship between the light emitting section and the
20 light receiving section can be suppressed.
The yarn winding device described above preferably
has the following configuration. In other words, the yarn
winding device includes a yarn guide section and a cover
section. The yarn guide section becomes a supporting point
25 of traversing when the yarn is traversed. The cover section
is arranged between the package and the yarn guide section,
and adapted to guide the yarn to be traversed. The traverse
detection section is arranged in the cover section.
Since the traverse detection section is arranged in
30 the cover section that guides the yarn, the yarn to be
traversed can be more reliably detected.
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In the yarn winding device described above, a part
of the cover section is preferably the reflecting section.
Therefore, the number of components can be reduced,
and the assembly cost can be reduced.
5 In the yarn winding device described above, plating
process is preferably performed on the cover section
including the reflecting section.
The reflectivity of the reflecting section can thus
be enhanced by performing the plating process, so that the
10 light amount of the light emitting section can be reduced
and the lifespan can be extended.
In the yarn winding device described above, zinc
plating process is performed on the cover section including
the reflecting section.
15 Since the portion subjected to the zinc plating
process has high strength and scratches are less likely to
be formed thereon, the reflectivity of the reflecting
section can be maintained for a long period of time and
corrosion can be effectively prevented.
20 In the yarn winding device described above, chrome
plating process is preferably performed on the cover
section including the reflecting section.
Since the portion subjected to the chrome plating
process has high strength and scratches are less likely to
25 be formed thereon, the reflectivity of the reflecting
section can be maintained for a long period of time, gloss
can be enhanced and the light amount of the light emitting
section can be further reduced.
In the yarn winding device described above, the cover
30 section including the reflecting section is preferably made
of stainless steel.
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The trouble of performing the plating process thus
can be avoided. Furthermore, the reflectivity of the
reflecting section can be enhanced and rust can be prevented
from being generated.
5 The yarn winding device described above preferably
has the following configuration. In other words, the cover
section includes a first plate and a second plate arranged
along a direction in which the yarn is traversed, and
arranged so as to sandwich the yarn path through which the
10 yarn to be traversed passes. Each of the first plate and
the second plate is provided with a hole portion at a same
position in a direction orthogonal to the direction in which
the yarn is traversed. The light emitting section and the
light receiving section are attached on a non-passing side
15 of the hole portion of the first plate. The reflecting
section is located at a position spaced apart by an interval
from the second plate on the non-yarn passing side of the
hole portion of the second plate.
Therefore, the reflecting section is located with an
20 interval on the non-yarn passing side of the hole portion
of the second plate, so that when the light emitting section,
the light receiving section, or the reflecting section
becomes dirty, the dirt can be easily removed.
In the yarn winding device described above, plating
25 process is preferably performed on the reflecting section.
The reflectivity can be enhanced by performing the
plating process, so that the light amount of the light
radiated from the light emitting section can be reduced and
the lifespan can be extended.
30 In the yarn winding device described above, zinc
plating process is preferably performed on the reflecting
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section.
Since the portion subjected to the zinc plating
process has high strength and scratches are less likely to
be formed thereon, the reflectivity of the reflecting
5 section can be maintained for a long period of time and
corrosion can be effectively prevented.
In the yarn winding device described above, chrome
plating process is preferably performed on the reflecting
section.
10 Since the portion subjected to the chrome plating
process has high strength and scratches are less likely to
be formed thereon, the reflectivity of the reflecting
section can be maintained for a long period of time, gloss
can be enhanced and the light amount of the light emitting
15 section can be further reduced.
In the yarn winding device described above, the
reflecting section is preferably made of stainless steel.
The trouble of performing the plating process thus
can be avoided. Furthermore, the reflectivity of the
20 reflecting section can be enhanced and rust can be prevented
from being generated.
The yarn winding device described above preferably
has the following configuration. In other words, the yarn
winding device includes a control section adapted to
25 control the traverse detection section. The control
section changes a light amount emitted by the light emitting
section so that a light amount received by the light
receiving section becomes constant when the yarn is not
detected.
30 Thus, even if the light emitting surface, the light
receiving surface, and the like become dirty, the yarn to
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be traversed can be accurately detected by increasing the
light amount.
In the yarn winding device described above, the
winding section preferably includes a winding drum provided
5 with a traverse groove for rotating a package, and the yarn
is traversed by the traverse groove.
Thus, the traversing failure that occurs when
deviating from the traverse groove or straight winding can
be accurately detected.
10
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view illustrating an overall
configuration of an automatic winder according to one
embodiment of the present invention;
15 FIG. 2 is a front view of a winder unit;
FIG. 3 is an enlarged front view of the vicinity of
a winding device;
FIG. 4 is a view showing a positional relationship
of a traverse region and a traverse detection sensor;
20 FIG. 5 is a perspective view illustrating the
vicinity of the traverse detection sensor;
FIG. 6 is a cross-sectional view taken along line A-A
of FIG. 3;
FIGS. 7(a) and 7(b) are graphs describing the
25 difference in data acquired in the present embodiment and
the prior art example; and
FIG. 8 is a front view showing an alternative
embodiment of a configuration in which a cover section and
a reflecting section are integrated.
30
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
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A preferred embodiment of the present invention will
be described below with reference to the drawings. As
illustrated in FIG. 1, an automatic winder (yarn winding
device) 1 according to one embodiment of the present
5 invention includes a plurality of winder units (yarn
winding units) 10 arranged in line, and a machine control
section 11 arranged at one end in a direction in which the
plurality of winder units 10 are arranged in line.
The machine control section 11 includes a display
10 device 12 that can display information related to each
winder unit 10, an instruction input unit 13 for an operator
to input various types of instructions to the machine
control section 11, and the like. The operator of the
automatic winder 1 checks the various types of information
15 displayed on the display device 12 and appropriately
operates the instruction input unit 13 to collectively
manage the plurality of winder units 10.
Each winder unit 10 is configured to unwind a yarn
21 from a yarn supplying bobbin 20, and wind the yarn 21
20 around a winding bobbin 22. The winding bobbin 22 around
which the yarn 21 is wound is referred to as a package 23.
In the following description, "upstream" and "downstream"
refers to the upstream and the downstream when viewed in
a travelling direction of the yarn 21.
25 As illustrated in FIG. 2, the winder unit 10 includes
a yarn supplying section 25 and a winding section 26.
The yarn supplying section 25 can hold the yarn
supplying bobbin 20 adapted to supply the yarn 21 in a
substantially upright state. Specifically, the winding
30 section 26 includes a cradle 27, a winding drum 28, and a
cover section 29.
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The cradle 27 rotatably supports the winding bobbin
22. The cradle 27 can cause a circumferential surface of
the supporting winding bobbin 22 to make contact with an
outer circumferential surface of the winding drum 28. The
5 winding drum 28 is arranged to face the winding bobbin 22,
and is rotatably driven by a drum drive motor 53.
A traverse groove 28a in a reciprocating spiral form
is formed on the outer circumferential surface of the
winding drum 28 to traverse the yarn 21 to be wound around
10 the winding bobbin 22. The winding drum 28 is coupled to
an output shaft of the drum drive motor 53, and is rotatably
driven by the drum drive motor 53. When the winding drum
28 is rotatably driven with the yarn 21 introduced in the
traverse groove 28a, the package 23 making contact with the
15 winding drum 28 is rotated accompanying the rotation of the
winding drum 28, and the yarn 21 can be wound around the
outer circumferential surface of the package 23 while
traversing. A yarn layer is thereby formed on the surface
of the package 23.
20 The cover section 29 is a plate-shaped body made of
metal, and is formed to surround a path of the yarn 21 to
be traversed. The cover section 29 guides the yarn 21 by
making contact with the yarn 21 to be traversed.
A traverse detection sensor (traverse detection
25 section) 70 is attached to the cover section 29. The
traverse detection sensor 70 is an optical sensor, and can
detect the passing of the yarn 21 in a detection region.
The traverse detection sensor 70 determines the presence
or absence of the yarn 21 from the detection result, and
30 outputs the determination result to a unit control section
(control section) 30.
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The unit control section 30 further determines
whether or not the yarn 21 is detected at a predetermined
traverse period based on the determination result of the
traverse detection sensor 70. If the yarn 21 is not
5 detected at the defined traverse period, there is a
possibility that straight winding (state in which the yarn
21 is wound around the same area without being traversed),
drum winding (state in which the yarn 21 is wound around
the winding drum 28) , or the like has occurred. A specific
10 structure of the traverse detection sensor 70 will be
described later.
Each winder unit 10 includes the unit control section
30. The unit control section 30 is configured by hardware
such as a CPU, a ROM, a RAM, and the like, and software such
15 as the control program stored in the RAM. The hardware and
the software cooperatively operate to control each
configuration of the winder unit 10. The unit control
section 30 of each winder unit 10 is configured to be
communicable with the machine control section 11. Thus,
20 the operation of each winder unit 10 can be collectively
managed in the machine control section 11.
In the winder unit 10, an unwinding assisting device
31, a tension applying device 32, a yarn joining device 33,
a yarn monitoring device 34, and a yarn guide section 35
25 are arranged in this order from the upstream along a yarn
travelling path between the yarn supplying section 25 and
the winding section 26.
The unwinding assisting device 31 includes a
regulating member 31a that can be placed over a core tube
30 of the yarn supplying bobbin 20. The regulating member 31a
is configured in a substantially tube shape, and is arranged
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to make contact with a balloon formed at an upper part of
the yarn layer of the yarn supplying bobbin 20. The balloon
is a portion where the yarn 21 unwound from the yarn
supplying bobbin 20 is swung by a centrifugal force. When
5 the regulating member 31a is brought into contact with the
balloon, the tension is applied on the yarn at the portion
of the balloon thus preventing the yarn 21 from being swung
excessively. The yarn 21 thus can be appropriately unwound
from the yarn supplying bobbin 20.
10 The tension applying device 32 applies a
predetermined tension on the travelling yarn 21. The
tension applying device 32 of the present embodiment is a
gate-type tension applying device in which movable comb
teeth are arranged with respect to fixed comb teeth. The
15 yarn 21 is passed while being bent between the comb teeth
in the meshed state to apply an appropriate tension on the
yarn 21. A disc-type tension applying device 32, for
example, may be employed instead of the gate-type tension
applying device described above.
20 When the yarn 21 between the yarn supplying bobbin
20 and the package 23 is disconnected for some reason, the
yarn joining device 33 joins a lower yarn from the yarn
supplying bobbin 20 and an upper yarn from the package 23.
In the present embodiment, the yarn joining device 33 is
25 configured as a splicer device adapted to twist yarn ends
with a whirling airflow generated by compressed air.
However, the yarn joining device 33 is not limited to the
splicer device, and for example, a mechanical knotter and
the like may be employed.
30 In the height direction of the winder unit 10, a lower
yarn catching member 54 adapted to catch and guide the yarn
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(lower yarn) from the yarn supplying bobbin 20 and an upper
yarn catching member 55 adapted to catch and guide the yarn
(upper yarn) from the package 23 are arranged below and
above the yarn joining device 33. The lower yarn catching
5 member 54 is configured by a lower yarn catching pipe 56
connected to a negative pressure source (not illustrated)
and a suction port 57 at a distal end. The upper yarn
catching member 55 is configured by an upper yarn catching
pipe 58 connected to a negative pressure source (not
10 illustrated) and a suction mouth 59 at a distal end.
According to such a configuration, a suction flow can be
generated at the suction port 57 and the suction mouth 59.
The lower yarn catching pipe 56 and the upper yarn catching
pipe 58 respectively has a base portion supported in a
15 rotatable manner, and can be vertically rotated.
When the yarn 21 between the yarn supplying bobbin
20 and the package 23 is in the disconnected state, the lower
yarn catching member 54 catches the lower yarn from the yarn
supplying bobbin 20 and guides the lower yarn to the yarn
20 joining device 33, and the upper yarn catching member 55
catches the upper yarn from the package 23 and guides the
upper yarn to the yarn joining device 33. The yarn joining
device 33 is driven in such a state, so that the upper yarn
and the lower yarn are joined and the yarn 21 between the
25 yarn supplying bobbin 20 and the package 23 is in a continued
state. The winding of the yarn 21 into the package 23 thus
can be resumed.
The yarn monitoring device 34 monitors the quality
of the travelling yarn 21 with an optical sensor (not
30 illustrated) , and detects a yarn defect (abnormal area in
the yarn 21) in the yarn 21. A cutter 39, which is adapted
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to cut the yarn 21 when the yarn monitoring device 34 detects
a yarn defect, is arranged in the vicinity of the yarn
monitoring device 34. The cutter 39 includes a cutting
blade and a solenoid (not illustrated) , and current is flown
5 to the solenoid to drive the cutting blade and cut the yarn
21.
The yarn guide section 35 is a flat plate-shaped plate
material provided with a cutout for guiding the yarn 21.
The reciprocate movement in traversing can be prevented
10 from being transmitted to the upstream by guiding the yarn
21 with the yarn guide section 35. A position where the
yarn guide section 35 guides the yarn 21 becomes a
supporting point of the traversing.
Next, the structure and the arrangement of the
15 traverse detection sensor 70 will be described in detail
with reference to FIG. 3 to FIG. 6.
As illustrated in FIG. 3, the cover section 29
described above is configured by a front plate (second
plate) 81 arranged on a front side (opposite side of the
20 winding drum 28) and a rear plate (first plate) 82 arranged
on a rear side (winding drum 28 side). The front plate 81
and the rear plate 82 are arranged in parallel with an
interval, and the yarn 21 to be traversed is passed between
the front plate 81 and the rear plate 82. The front plate
25 81 is arranged so as to avoid the center of the traverse
region.
As illustrated in FIG. 6, a through-hole portion 81a
is formed in the front plate 81, and a through-hole portion
82a is formed in the rear plate 82. The hole portion 81a
30 and the hole portion 82a are formed at corresponding
positions (specifically, the same position in the direction
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orthogonal to the traverse region).
The cover section 29 is entirely subjected to plating
process. The type of plating process is arbitrary, but is
preferably zinc plating or chrome plating (hard chrome
5 plating) . The cover section 29 may be made from stainless
steel, and the plating process may be omitted.
The traverse detection sensor 70 is arranged at one
end of the traverse region. More specifically, the
traverse detection sensor 70 is arranged on an end side
10 rather than at the center of three regions obtained by
equally dividing the traverse region in the package width
direction (see FIG. 4) . The traverse detection sensor 70
of the present embodiment is arranged in the region at the
farthest end even if the traverse region is divided into
15 four regions. As illustrated in FIG. 3 and FIG. 6, the
traverse detection sensor 70 includes a case 71, a light
emitting section 72, a light receiving section 73, a
reflecting section 74, and a sensor control section 75.
The case 71 is a box-shaped member, and is attached
20 on the rear side (side opposite to the side where the yarn
21 passes, non-yarn passing side) of the rear plate 82 (see
FIG. 6) . The light emitting section 72 and the light
receiving section 73 are arranged in the case 71. The
sensor control section (control section) 75 is arranged in
25 the case 71. The sensor control section 75 carries out the
process of appropriately converting a signal obtained by
the light receiving section 73, and outputting the
converted signal to the unit control section 30, and the
like.
30 The light emitting section 72 is arranged in the case
71, and thus is located on the rear side (non-yarn passing
17 / 31
side) of the rear plate 82. The light emitting section 72
can emit the light such as the infrared light from the hole
portion 82a toward the front plate 81. The light emitted
by the light emitting section 72 is passed through the hole
5 portion 82a, between the front plate 81 and the rear plate
82 (yarn path where the yarn 21 to be traversed passes),
through the hole portion 81a, and radiated onto the
reflecting section 74.
As illustrated in FIG. 3, FIG. 5, and FIG. 6, the
10 reflecting section 74 is a plate-like member arranged with
an interval on the front side (non-yarn passing side) of
the front plate 81. The reflecting section 74 is supported
by a portion extending from the rear side toward the front
side at the outer side of the front plate 81. The reflecting
15 section 74 is arranged at a position corresponding to the
hole portion 81a and the hole portion 82a. The plating
process such as the zinc plating and the chrome plating
(hard chrome plating) is also performed on the reflecting
section 74. Alternatively, the reflecting section 74 may
20 be made from stainless steel, and the plating process may
be omitted.
Similarly to the light emitting section 72, the light
receiving section 73 is located on the rear side (non-yarn
passing side) of the rear plate 82. Therefore, the light
25 emitting section 72 and the light receiving section 73 are
both located on one side of the yarn path, through which
the yarn 21 to be traversed passes, and the reflecting
section 74 is located on the other side. The light
receiving section 73 receives the light emitted by the light
30 emitting section 72 and reflected by the reflecting section
74. The light receiving section 73 generates a detection
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signal of a voltage value corresponding to the received
light amount.
If the yarn 21 is not traversing the traverse
detection sensor 70, the voltage value of the detection
5 signal is substantially constant. However, if the yarn 21
is traversing the traverse detection sensor 70, the light
is blocked by the yarn 21 and hence the voltage value of
the detection signal is reduced. The sensor control
section 75 determines that the yarn 21 has traversed at the
10 timing at which the voltage value of the detection signal
is reduced, and outputs the determination result to the unit
control section 30.
In the conventional method of detecting the reflected
light from the yarn as described above, it has been
15 difficult to detect the color yarn that absorbs light (see
FIG. 7 (b) ) . On the contrary, in the method of the present
embodiment of detecting the reduction of the light amount
when the yarn 21 passes, not only the black yarn having high
absorptivity of light can be detected but also the white
20 yarn that also absorbs light to a certain extent can be
detected. Therefore, various yarns can be detected
without increasing the light amount of the light emitting
section 72.
As illustrated in FIG. 3 and FIG. 4, the light emitting
25 section 72 and the light receiving section 73 are arranged
along the travelling direction of the yarn 21 to be detected.
The yarn 21 to be traversed thus traverses the light
emitting section 72 and the light receiving section 73 at
the same time. Consequently, as illustrated in FIG. 6, the
30 light emitted by the light emitting section 72 is blocked
by the yarn 21 thus lowering the light amount, and the light
19/3.1
reflected by the reflecting section 74 is again blocked by
the yarn 21 thus further lowering the light amount.
Therefore, the detection accuracy of the yarn 21 can be
enhanced.
5 Next, a description will be made on a configuration
for maintaining the detection accuracy of the traverse
detection sensor 70.
If the plating process is performed on the reflecting
section 74, the reflectivity can be enhanced, and the
10 strength can be enhanced so that scratches are less likely
to be formed. The reflectivity thus can be maintained for
a long period of time. Furthermore, if the reflecting
section 74 is made of stainless steel, rust can be prevented
and hence the reflectivity can be maintained for a long
15 period of time.
However, the fiber, wax, or the like of the yarn 21
sometimes flies in all directions between the front plate
81 and the rear plate 82. Therefore, the fiber and the like
may attach to the light emitting section 72, the light
20 receiving section 73, or the reflecting section 74. If the
fiber and the like attach, the light is blocked by the fiber
and the like, and hence the detection accuracy of the yarn
21 is gradually lowered. In view of such an aspect, two
countermeasures are achieved in the present embodiment.
25 The first countermeasure is a method of adjusting the
light amount of the light emitted by the light emitting
section 72. In the present embodiment, the light receiving
section 73 is assumed to detect a constant light amount
unless the yarn 21 is traversed. Thus, in the present
30 embodiment, a predicted value of the light amount to be
received by the light receiving section 73 when the yarn
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21 does not traverse is set, and the light emitting section
72 is controlled so that the light amount received by the
light receiving section 73 becomes the predicted value.
Specifically, the sensor control section 75 obtains a
5 deviation of the predicted value and the light amount
actually received by the light receiving section 73. The
sensor control section 75 carries out a feedback control
so that the deviation becomes smaller in view of the
deviation, and a differential value, integral value, or the
10 like of the deviation as necessary.
Thus, even if the fiber and the like attach to the
light emitting section 72, the light receiving section 73,
or the reflecting section 74, the light amount of the light
emitting section 72 can be raised accordingly, whereby the
15 lowering in the detection accuracy of the yarn 21 can be
prevented. Furthermore, since the light amount of the
light emitting section 72 is not raised constantly but is
raised as needed, the load of the light emitting section
72 can be reduced and the lifespan can be extended compared
20 to the conventional method of carrying out the detection
with the light amount constantly raised.
The light amount of the light emitting section 72 also
has a limit value, and thus an alarm may be issued when a
predetermined light amount or more is necessary, when the
25 deviation is not reduced even after the feedback control
is carried out continuously for a predetermined time, and
the like.
The second countermeasure is that cleaning can be
easily carried out. In the present embodiment, the
30 reflecting section 74 is arranged at a position distant from
the front plate 81, and a space between the light emitting
21 / 31
section 72 and the reflecting section 74 is opened.
Therefore, an elongate rod-shaped member and the like can
be inserted to the open portion to rub the surface of the
light emitting section 72 and the like, whereby the fiber
5 and the like attached to the light emitting section 72 and
the like can be removed. An alarm urging the cleaning of
the light emitting section 72 and the like may be issued
based on the feedback control on the light emitting section
72.
10 Next, a description will be made on an alternative
embodiment of the above described embodiment with reference
to FIG. 8. In the description of this alternative
embodiment, the members same as or similar to the embodiment
described above are denoted with the same reference
15 numerals in the drawings, and the description thereof may
be omitted.
In the embodiment described above, the reflecting
section 74 is arranged separately from the front plate 81.
On the other hand, in this alternative embodiment, a part
20 of the front plate 81 functions as the reflecting section
74. That is, the light emitted by the light emitting
section 72 is reflected by the rear surface of the front
plate 81, and the reflected light is received by the light
receiving section 73.
25 Therefore, although the cleaning becomes more
troublesome than the embodiment described above, the number
of components can be reduced. Furthermore, when the light
is reflected at the front plate 81, the plating process such
as the zinc plating and chrome plating (hard chrome plating)
30 is preferably performed on the entire front plate 81
including the reflecting section 74. Alternatively, the
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entire front plate 81 including the reflecting section 74
may be made from stainless steel, and the plating process
may be omitted.
As described above, the automatic winder 1 includes
5 the winding section 26 and the traverse detection sensor
70. The winding section 26 winds the yarn 21 while
traversing the yarn 21. The traverse detection sensor 70
is arranged in a traverse region, where the yarn 21 is
traversed by the winding section 26, to detect the yarn 21
10 to be traversed. The traverse detection sensor 70 includes
the light emitting section 72, the reflecting section 74
adapted to reflect the light emitted from the light emitting
section 72, and the light receiving section 73 adapted to
receive the light reflected by the reflecting section 74.
15 The light receiving section 73 and the reflecting section
74 are arranged at positions sandwiching the yarn path,
through which the yarn 21 to be traversed passes, and at
positions of detecting any one of the two regions at the
ends of the three regions obtained by equally dividing the
20 traverse region in the package width direction.
The light emitted by the light emitting section 72
and reflected by the reflecting section 74 is thus blocked
by the yarn 21 to be traversed, so that the light amount
is lowered. As a result, the yarn 21 to be traversed can
25 be detected regardless of the color of the yarn.
Furthermore, since the traverse detection sensor 70 is
arranged in an end region of the traverse region, drawbacks
can be accurately detected, such as the state in which the
traverse region becomes small, the straight winding in
30 which the yarn 21 is wound around one part of the package
without being traversed, and the drum winding in which the
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yarn 21 is wound around the drum.
A preferred embodiment and an alternative embodiment
of the present invention have been described above, but the
above-described structure may be modified as below.
5 In the above description, the light emitting section
72 is arranged on the lower side (upstream) and the light
receiving section 73 is arranged on the upper side
(downstream) , but this arrangement may be reversed. Also,
in the above description, the light emitting section 72 and
10 the light receiving section 73 are integrally configured,
but the light emitting section 72 and the light receiving
section 73 may be configured as separate bodies. In this
case, the degree of freedom of the layout is enhanced, but
the position adjustment of the light emitting section 72
15 and the light receiving section 73 becomes difficult.
The traverse detection sensor 70 may be arranged in
a region at the end on the opposite side (unit control
section 30 side) . Furthermore, the light emitting section
72 and the light receiving section 73 may be arranged on
20 the front plate 81, and the reflecting section 74 may be
arranged on the rear plate 82. In this case, the
maintenance of the light emitting section 72 and the light
receiving section 73 is facilitated, but the cleaning of
the light emitting section 72 and the like becomes
25 troublesome.
In the above description, the traversing is carried
out in the winding drum 28 provided with the traverse groove,
but an arm-type traverse device, a belt-type traverse
device, or a rotary-type traverse device may be used. In
30 this case, a roller that is not provided with the traverse
groove can be used as an auxiliary roller. In particular,
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if the arm-type traverse device is used, the traverse
detection section is arranged at a central part in the
traverse width of the traverse guide, so that even if the
traverse failure that occurs when the yarn is not engaged
5 to the traverse guide occurs, the traverse failure can be
detected without arranging a plurality of traverse
detection sections. Moreover, Japanese Unexamined Patent
Publication No. 2012-153476 discloses a specific effect
that the position adjustment of the traverse detection
10 section does not need to be carried out even when changing
the traverse width in the arm-type traverse device. In the
case of such an arm-type traverse device, the effect
described in Japanese Unexamined Patent Publication No.
2012-153476 can be obtained in addition to the effect of
15 the present invention obtained by arranging the traverse
detection section of the present invention at the central
part in the traverse width of the traverse guide.
In the above description, the control of the traverse
detection sensor 70 is carried out by the sensor control
20 section 75, but at least a part of the control may be carried
out by the unit control section 30.
The present invention is not limited to the automatic
winder, and may be applied to other yarn winding devices
such as a re-winding machine, a fine spinning machine (e.g.,
25 an air-jet spinning machine, an open-end spinning machine,
or the like).
25 / 31
WE CLAIM:
1. A yarn winding device characterized by
comprising:
5 a winding section adapted to wind a yarn while
traversing; and
a traverse detection section arranged in a traverse
region where the yarn is traversed by the winding section
(26), and adapted to detect a yarn to be traversed,
10 wherein the traverse detection section includes a
light emitting section, a reflecting section adapted to
reflect light emitted from the light emitting section, and
a light receiving section adapted to receive the light
reflected by the reflecting section, and
15 the light receiving section and the reflecting
section are arranged at positions sandwiching a yarn path,
through which the yarn to be traversed passes, and at
positions of detecting any one of two regions at both ends
of three regions obtained by equally dividing the traverse
20 region in a package width direction.
2. The yarn winding device according to claim 1,
characterized in that
the light emitting section and the light receiving
25 section are arranged on a same side with respect to the yarn
path, through which the yarn to be traversed passes.
3. The yarn winding device according to claim 2,
characterized in that
30 the light emitting section and the light receiving
section are arranged along a travelling direction of the
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yarn to be detected.
4 . The yarn winding device according to any one of
claims 1 to 3, characterized in that
5 the light emitting section and the light receiving
section are integrally configured.
5. The yarn winding device according to any one of
claims 1 to 4, characterized by further comprising:
10 a yarn guide section to become a supporting point of
traversing when the yarn is traversed; and
a cover section arranged between the package and the
yarn guide section, and adapted to guide the yarn to be
traversed,
15 wherein the traverse detection section is arranged
in the cover section.
6. The yarn winding device according to claim 5,
characterized in that a part of the cover section is the
20 reflecting section.
7. The yarn winding device according to claim 6,
characterized in that
plating process is performed on the cover section
25 including the reflecting section.
8. The yarn winding device according to claim 7,
characterized in that
the plating process is zinc plating process, and
30 the zinc plating process is performed on the cover
section including the reflecting section.
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9. The yarn winding device according to claim 7,
characterized in that
the plating process is chrome plating process, and
5 the chrome plating process is performed on the cover
section including the reflecting section.
10. The yarn winding device according to claim 6,
characterized in that
10 the cover section including the reflecting section
is made of stainless steel.
11. The yarn winding device according to claim 5,
characterized in that
15 the cover section includes a first plate and a second
plate arranged along a direction in which the yarn is
traversed, and arranged so as to sandwich the yarn path
through which the yarn to be traversed passes,
each of the first plate and the second plate is
20 provided with a hole portion at a same position in a
direction orthogonal to the direction in which the yarn is
traversed,
the light emitting section and the light receiving
section are attached on a non-passing side of the hole
25 portion of the first plate, and
the reflecting section is located at a position
spaced apart from the second plate on the non-yarn passing
side of the hole portion of the second plate.
30 12. The yarn winding device according to claim 11,
characterized in that
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plating process is performed on the reflecting
section.
13. The yarn winding device according to claim 12,
5 characterized in that
the plating process is zinc plating process, and
the zinc plating process is performed on the
reflecting section.
10 14. The yarn winding device according to claim 12,
characterized in that
the plating process is chrome plating process, and
the chrome plating process is performed on the
reflecting section.
15
15. The yarn winding device according to claim 11,
characterized in that
the reflecting section is made of stainless steel.
20 16. The yarn winding device according to any one of
claims 1 to 15, characterized by further comprising
a control section adapted to control at least the
traverse detection section, wherein
the control section changes a light amount emitted
25 by the light emitting section so that a light amount
received by the light receiving section becomes constant
when the yarn is not detected.
17. The yarn winding device according to any one of
30 claims 1 to 16, characterized in that
the winding section includes a winding drum provided
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with a traverse groove for rotating a package, and
the yarn is traversed by the traverse groove.