YARN WINDING DEVICE
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a yarn winding device adapted to wind a yarn unwound from a yarn supplying bobbin into a package.
2. Description of the Related Art
There is known a yarn winding device adapted to wind a yarn unwound from a yarn supplying bobbin while traversing with a traverse drum to form a package. Japanese Registered Utility Model No. 3006822 describes providing a traverse sensor mechanism (yarn detection sensor) at a portion immediately upstream of a drum (traverse drum) in such a yarn winding device to detect abnormality of traversing with the traverse sensor mechanism. Japanese Unexamined Patent Publication No. 2010-11480 describes providing a yarn guide frame (yarn guide) in proximity to the traverse drum so that a yarn moving in an axial direction of the traverse drum accompanying the traversing is guided by the yarn guide frame.
In the yarn winding device provided with the yarn guide described in Japanese Unexamined Patent Publication No. 2010-11480, consideration is made in providing a yarn detection sensor as described in Japanese Registered Utility Model No. 3006822 to detect the abnormality of traversing.
In this case, a movable range of the yarn to be traversed is greater at a position close to the traverse drum in the yarn winding device
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described in Japanese Registered Utility Model No. 3006822 and Japanese Unexamined Patent Publication No. 2010-11480, and hence the yarn detection sensor is preferably arranged at a position close to the traverse drum to detect the yarn so that false detection is unlikely to occur.
However, in Japanese Unexamined Patent Publication No . 2010-11480, since the yarn guide is provided in close proximity to the traverse drum, the yarn detection sensor is required to be arranged so as not to interfere with the yarn guide, and when attempting to arrange the yarn detection sensor at a position different from the yarn guide, the yarn detection sensor is inevitably arranged at a position upstream of the yarn guide. As a result, the yarn detection sensor is arranged at a position located away from the traverse drum, and false detection tends to easily occur.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a yarn winding device capable of accurately detecting abnormality of traversing even if a yarn guide adapted to guide a yarn to be traversed by a traverse drum is provided.
A yarn winding device according to a first aspect of the invention
includes a traverse device adapted to traverse a yarn to be wound into
a rotating winding package; a yarn guide arranged upstream of a yarn
path of the traverse device, and includes a first guide wall portion
adapted to guide a yarn to be traversed by the traverse device by a
guide surface; and a yarn detection sensor adapted to detect the yarn
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to be traversed, the yarn detection sensor being configured by a reflective optical sensor including a light emitting unit and a light receiving unit; wherein the yarn detection sensor is attached to the first guide wall portion of the yarn guide.
According to the present invention, the yarn detection sensor is attached to the first guide wall portion of the yarn guide arranged in proximity to the traverse device to guide the yarn, and thus the yarn can be detected at a position close to the traverse device.
If the yarn detection sensor is a reflective sensor, the light emitting unit and the light receiving unit are lined adjacently, and thus cleaning of the light emitting surface and the light receiving surface is facilitated compared to the transmissive sensor in which the light emitting unit and the light receiving unit are arranged facing each other. In the case of the reflective sensor, it can be arranged so as not to project out from the guide surface, as opposed to the transmissive sensor, when arranged on the yarn guide, and thus interference with other members can be prevented.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a winding unit according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the vicinity of a traverse drum of FIG. 1:
FIG. 3 is a view of FIG. 2 seen from a direction of an arrow III; FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2; and
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FIG. 5 is a view illustrating a state before bend of a yarn guide of FIG. 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Embodiments of the present invention will be hereinafter described. The present embodiment is an example in which the present invention is applied to an automatic winder including a plurality of winding units adapted to wind a yarn unwound from a yarn supplying bobbin around a winding tube to form a winding package. The automatic winder has a configuration in which the plurality of winding units, each forming one package, are arranged in line in one direction.
As illustrated in FIG. 1, each winding unit 1 includes a bobbin supporting section 3 and a yarn winding section 4. The winding unit 1 holds a supplied yarn supplying bobbin 8 with the bobbin supporting section 3 and winds a spun yarn Y unwound from the yarn supplying bobbin 8 around a winding tube 6 while traversing to form a package P of a predetermined shape. A near side in the plane of drawing in FIG. 1 is defined as a front side (front surface side) on which an operator performs operations on the winding unit 1, and a far side in the plane of drawing is defined as a back side (rear surface side) opposite thereto.
The bobbin supporting section 3 holds the yarn supplying bobbin 8 supplied from a bobbin supplying device (not illustrated) in an upright state. A yarn unwinding assisting device 11, a tension applying device 12, a yarn joining device 13, and a clearer 14 (yarn defect detection device) are arranged in this order from the bobbin supporting section
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3 on a yarn travelling path between the bobbin supporting section 3 and the yarn winding section 4.
The yarn unwinding assisting device 11 regulates bulging (balloon) of the yarn Y being unwound by lowering a movable tubular body 21, which is covered on an upper end of the yarn supplying bobbin 8, in accordance with advancement in the unwinding of the yarn Y, thereby stabilizing unwinding tension.
The tension applying device 12 applies a predetermined tension on the travelling yarn Y. The tension applying device 12 may, for example, be a gate-type including fixed comb teeth and movable comb teeth arranged to be movable with respect to the fixed comb teeth.
The yarn joining device 13 joins a yarn from the yarn supplying side (lower yarn) and a yarn from the winding side (upper yarn) after yarn cut, which is performed by the clearer 14 to be described later when detecting yarn defect, or after a yarn breakage while unwinding the yarn from the yarn supplying bobbin 8. The yarn joining device 13 may, for example, be a so-called air-type yarn joining device (air splicer) including an untwisting nozzle adapted to untwist an upper yarn end and a lower yarn end and a twisting nozzle adapted to twist the untwisted yarn ends by action of a whirling airflow.
The clearer 14 detects yarn defects such as slub and presence/absence of the yarn, and is provided with a cutter for cutting the yarn when detecting the yarn defect.
An upper yarn catching and guiding member 15 adapted to suck and catch the upper yarn from the package P and guide the upper yarn to the yarn joining device 13, and a lower yarn catching and guiding member
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16 adapted to suck and catch the lower yarn from the yarn supplying bobbin 8 to guide the lower yarn to the yarn joining device 13 are provided above and below the yarn joining device 13. The upper yarn catching and guiding member 15 is formed in a pipe-shape, and is arranged to be vertically swingable with a shaft 15a as a center, and is provided with a mouth 15b at a distal end portion. Similarly, the lower yarn catching and guiding member 16 is formed in a pipe-shape, and is arranged to be vertically swingable with a shaft 16a as a center, and is provided with a suction port 16b at a distal end portion. Furthermore, an appropriate negative pressure source is connected to the upper yarn catching and guiding member 15 and the lower yarn catching and guiding member 16, and the air can be sucked from the mouth 15b and the suction port 16b at the respective distal end portions to catch the yarn ends. The yarn winding section 4 includes a cradle 27 having a pair of cradle arms adapted to swingably and detachably support the winding tube 6, and a traverse drum 28 (traverse device) capable of making contact with a surface of the winding tube 6 supported by the cradle 27 or a surface of the package P formed on the winding tube 6. A traverse groove 28a for traversing the yarn Y is formed on the surface of the traverse drum 28 along a peripheral direction. The yarn winding section 4 is configured to rotatably drive the traverse drum 28 with a drum driving motor (not illustrated) with the traverse drum 28 making contact with the winding tube 6 (or the surface of the package P) to rotate the winding tube 6 accompanying the rotation of the traverse drum 28 (accompanying rotation) while traversing the yarn Y, thereby forming the package P on the outer periphery of the winding tube 6. In this
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case, the yarn Y is traversed by entering the traverse groove 28a, but a state in which the yarn Y is displaced from the traverse groove 28a is simply described in FIG. 1, FIG. 2 and FIG. 5 to describe the movement of the yarn Y to be traversed.
A yarn guide 40 adapted to guide the yarn Y to be traversed by the traverse drum 28 is provided immediately on the front side of the traverse drum 28 . The yarn guide 40 is a plate-like body made of a metal material or the like, and includes a first guide wall portion 41, two second guide wall portions 42a, 42b, two yarn introducing portions 43a, 43b, and an attachment portion 44, as illustrated in FIG. 1 to FIG. 4.
The first guide wall portion 41 has a substantially trapezoid shape when seen from the front, and a surface on the front side (side opposite to the traverse drum 28) is a guide surface 41a. The yarn Y to be traversed by the traverse drum 28 makes contact with the guide surface 41a to be reciprocated in the axial direction (traverse direction) of the traverse drum 28 while being guided by the guide surface 41a.
A yarn detection sensor 50 is attached on a surface on a back side (side opposite to the guide surface 41a) of the first guide wall portion 41. The yarn detection sensor 50 is a so-called reflective optical sensor including a sensing section 51 in which a light emitting element (light emitting unit) and a light receiving element (light receiving unit) are arranged adjacently. A substantially circular through-hole 46 (light passing section) is formed at the left end in FIG. 4 of the first guide wall portion 41, and the yarn detection sensor 50 is attached
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so that the sensing section 51 is exposed to the guide surface 41a side through the through-hole 46. A distal end of the sensing section 51 is located inside the through-hole 46, and does not protrude out to the front side of the guide surface 41a.
Thus, irradiation light radiated from the light emitting element of the sensing section 51 is passed through the through-hole 46 to radiate up to the front of the first guide wall portion 41. When the yarn Y moved in the axial direction of the traverse drum 28 by the traversing arrives at the front of the through-hole 46, the irradiation light is reflected by the yarn Y, passed through the through-hole 46, and received by the sensing section 51.
If the yarn Y is located at a position not overlapping the through-hole 46, the irradiation light radiated from the light emitting element of the sensing section 51 is not reflected by the yarn Y, and the reflected light is not received by the light receiving element of the sensing section 51.
Therefore, in the yarn detection sensor 50, whether or not the traversing is normally carried out can be detected depending on whether or not the reflected light is received by the light receiving element of the sensing section 51 at a prescribed traverse period.
The two second guide wall portions 42a, 42b are connected to both ends with respect to the traverse direction of the first guide wall portion 41, and are folded back to the front side (the guide surface 41a side) with respect to the first guide wall portion 41 so as to cover the left end and the right end, respectively, of the first guide wall portion 41 in FIG. 2. The yarn Y guided by the guide surface 41a can
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be prevented from lifting up to the front side by the second guide wall portions 42a, 42b.
[0036] The second guide wall portion 42a is provided with a
substantially circular through-hole 47 at a portion overlapping the through-hole 46 of the first guide wall portion 41 (portion covering the through-hole 46) . The sensing section 51 exposed to the front side of the first guide wall portion 41 through the through-hole 46 is thus further exposed to the front side of the second guide wall portion 42a through the through-hole 47.
The two yarn introducing portions 43a, 43b are respectively located above the second guide wall portions 42a, 42b, and are continued to the upper ends of the second guide wall portions 42a, 42b. The two yarn introducing portions 43a, 43b are bent at the end on the inner side with respect to the axial direction (left and right direction of FIG. 2) of the traverse drum 28 so as to be overlapped front and back such that the yarn introducing portion 43b is on the front side of the yarn introducing portion 43a.
A gap 56, through which the yarn Y can pass, is formed between
the yarn introducing portion 43a and the yarn introducing portion 43b
overlapped front and back. When performing the yarn joining operation,
the upper yarn catching and guiding member 15 catches the yarn end of
the yarn Y in proximity to the surface of the traverse drum 28 and is
swung with the shaft 15a as center so that the caught yarn Y is guided
to the yarn joining device 13 passing through the front side of the
yarn guide 40. Therefore, the yarn Y is located on the front side of
any one of the second guide wall portions 42a, 42b, as illustrated with
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a chain dashed line in FIG. 2 and FIG. 3, immediately after the yarn joining operation is completed.
If the traverse drum 28 is rotated to resume the winding of the yarn Y in this state, if the yarn Y is located on the front side of the second guide wall portion 42a, the yarn Y reciprocated by the traversing is moved to a position making contact with the guide surface 41a through the gap 56. On the other hand, if the yarn Y is located on the front side of the second guide wall portion 42b, the yarn Y reciprocating by the traversing is once moved to the front side of the second guide wall portion 42a, and then moved to the position to make contact with the guide surface 41a through the gap 56.
The attachment portion 44 is continued to the upper end of the first guide wall portion 41, and is bent to the back side with respect to the first guide wall portion 41. The attachment portion 44 is fixed to a machine 57 of the winding unit 1. In FIG. 1, FIG. 2, and FIG. 4, the illustration of the machine 57 is omitted.
In the winding unit 1 described above, the yarn Y may get caught at the groove of the traverse drum 28 or the yarn Y may not enter the groove of the traverse drum 28 as the winding tension is weak, and thus the normal traversing may not be carried out. In this case, the yarn Y is often led to the central side of the traverse range.
On the contrary, in the present embodiment, the through-hole 4 6
is provided on the left end in FIG. 2 of the first guide wall portion
41, as described above, and thus the yarn detection sensor 50 detects
the yarn Y when the yarn Y arrives at the position close to one end
(reversing position) of the traverse range. Therefore, when the normal
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traversing is not carried out and the yarn Y is led closer to the central side of the traverse range, the abnormality of the traverse can be accurately detected.
The movement amount of the traversed yarn Y becomes greater as it is closer to the traverse drum 28, and thus when the normal traversing is not carried out and the traverse range becomes closer to the central side, the fluctuation of the movement amount of the yarn Y also becomes greater as it is closer to the traverse drum 28.
Specifically, for example, as illustrated in FIG. 5, if the yarn Y is normally traversed at a certain portion near the traverse drum 28, the yarn Y is reciprocated in a range of a moving width LI, and the movement amount of the relevant portion fluctuates by a fluctuation amount Dl, as illustrated with a chain dashed line, when the traverse abnormality occurs and the traverse range becomes closer to the central side. In this case, if a certain portion located away from the traverse drum 28 than the relevant portion of the yarn Y is normally traversed, the yarn Y is reciprocated at a moving width L2 smaller than the moving width Ll, and the movement amount fluctuates by a fluctuation amount D2 smaller than the fluctuation amount Dl when the traverse abnormality occurs and the traverse range becomes closer to the central side.
Therefore, for example, when the traverse range becomes closer
to the central side, if a sensing section 51A is arranged at a position
close to the traverse drum 28, as illustrated in FIG. 5, the yarn Y
is not detected and the abnormality of the traverse can be detected.
However, if a sensing section 51B is arranged at a position located
away from the traverse drum 28, the yarn Y is detected, and the
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abnormality of the traverse cannot be detected. In other words, detection can be made even with a fluctuation of a small traverse range as the position of the sensing section 51A of the yarn detection sensor 50 is closer to the traverse drum 28, and the accuracy in detection of the yarn detection sensor 50 can be improved.
In the present embodiment, the yarn detection sensor 50 is provided on the first guide wall portion 41 of the yarn guide 40 in close proximity to the traverse drum 28, and thus the abnormality of the traversing can be accurately detected.
As opposed to the present embodiment, if a so-called transmissive optical sensor in which the light emitting element and the light receiving element are arranged to face each other is provided in place of the yarn detection sensor 50, which is a reflective optical sensor, the light emitting element and the light receiving element need to be arranged to sandwich the yarn Y to be traversed from the front and the back. Thus, any one of the light emitting element and the light receiving element is required to be arranged on the front side of the yarn Y, that is, the front side of the first guide wall portion 41. As a result, the light emitting element or the light receiving element on the front side of the first guide wall portion 41 may interfere with the second guide wall portion 42a and the like, and the yarn detection sensor may become difficult to be arranged on the yarn guide 40.
On the other hand, in the present embodiment, the yarn detection sensor 50 is the reflective optical sensor, and thus the yarn detection sensor 50 can be arranged on the back side of the first guide wall portion
41 and the sensing section 51 may be exposed to the guide surface 41a
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from the through-hole 46 formed in the first guide wall portion 41, so that the yarn detection sensor 50 can be arranged without interfering with the second guide wall portion 42a and the like.
Furthermore, since the distal end of the sensing section 51 does not project out from the guide surface 41a, the sensing section 51 is protected by the first guide wall portion 41. Therefore, the yarn Y . can be prevented from making contact with the sensing section 51 thus damaging the sensing section 51, and cotton flies can be prevented from attaching to the sensing section 51.
Since the yarn guide 40 includes the second guide wall portion 42a folded back to the front side with respect to the first guide wall portion 41, the sensing section 51 is also protected by the second guide wall portion 42. Therefore, the yarn Y can be prevented from making contact with the sensing section 51 thus damaging the sensing section 51, and cotton flies can be reliably prevented from attaching to the sensing section 51.
In the present embodiment, the through-holes 46, 47 are
respectively formed at the portions of the first guide wall portion
41 and the second guide wall portion 42a facing each other with the
yarn path of the yarn to be traversed sandwiched therebetween, and the
sensing section 51 of the yarn detection sensor 50 is exposed to the
front side of the yarn guide 40 through the through-holes 46, 47.
Therefore, the sensing section 51 can be easily cleaned, i.e., the cotton
flies attached to the sensing section 51 can be removed by passing a
cotton swab from the through-holes 46, 47, or the like.
The second guide wall portions 42a, 42b are formed by folding back
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the plate-like yarn guide 40 towards the guide surface 41a at both ends of the first guide wall portion 41 with respect to the traverse direction by the traverse drum 28, so that the first guide wall portion 41 and the second guide wall portions 42a, 42b can be formed with one member.
Next, an alternative embodiment in which various modifications are made on the present embodiment will be described. However, the description on the configurations similar to the present embodiment will be appropriately omitted.
In the embodiment described above, the through-hole 47 is formed in the second guide wall portion 42a at the portion facing the through-hole 46 of the first guide wall portion 41, but the through-hole 47 may not be formed.
In this case, since the sensing section 51 of the yarn detection sensor 50 is covered by the second guide wall portion 42a without the through-hole 47, the sensing section 51 is more reliably protected by the second guide wall portion 42a. The sensing section 51 can be more reliably prevented from being damaged, and the cotton flies can be more reliably prevented from accumulating on the sensing section 51.
In the sensing section 51 of the yarn detection sensor 50, in a
narrow sense, the irradiation light radiated from the light emitting
element is reflected particularly at the second guide wall portion 42a
of the yarn guide 40, for example, even if the irradiation light is
not reflected at the yarn Y, and the reflected light is received by
the light receiving element. In such a case, the intensity of light
reflected from the second guide wall portion 42a made of a metal material
and received by the light receiving element becomes high compared to
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the intensity of the reflected light reflected from the yarn Y and received by the light receiving element, so that determination is made that the yarn Y is detected when the intensity of the light received by the light receiving element is smaller than a threshold value in the yarn detection sensor 50.
However, if the through-hole 47 is formed in the second guide wall portion 42a, as in the embodiment described above, the light can be passed before and after the second guide wall portion 42a through the through-hole 47, and hence the intensity of the light received by the light receiving element when the irradiation light radiated from the light emitting element is not reflected at the yarn Y fluctuates depending on the situations on the front side of the second guide wall portion 42a. Such fluctuation in the intensity of the light received by the light receiving element may become the cause of false detection.
On the other hand, if the through-hole 47 is not formed in the second guide wall portion 42a, the intensity of the light, which is received by the light receiving element when the irradiation light radiated from the light emitting element is not reflected at the yarn Y, does not fluctuate depending on the situations on the front side of the second guide wall portion 42a and is stable. Therefore, false detection is unlikely to occur in the yarn detection sensor 50.
However, in the case of the first alternative embodiment, since
the through-hole 47 is not formed in the second guide wall portion 42a,
a maintenance property such as cleaning of the sensing section 51
degrades compared to the embodiment described above.
Furthermore, in the embodiment described above, the plate-like
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yarn guide 40 is folded back towards the guide surface 41a at both ends of the first guide wall portion 41 with respect to the traverse direction by the traverse drum 28 to form the second guide wall portion, but the present invention is not limited thereto, and the first guide wall portion 41 and the second guide wall portions 42a, 42b may be respectively formed by different members.
In the embodiment described above, the yarn guide 40 includes the second guide wall portions 42a, 42b folded back towards the front side with respect to the guide surface 41a, but the yarn guide 40 may not include the second guide wall portions 42a, 42b.
In the embodiment described above, the yarn detection sensor 50 is arranged on the back side of the first guide wall portion 41 and the sensing section 51 of the yarn detection sensor 50 is exposed to the guide surface 41a side through the through-hole 46 formed in the first guide wall portion 41, but the present invention is not limited thereto. For example, the through-hole 46 may not be formed in the first guide wall portion 41, and the yarn detection sensor 50 may be attached to another portion of the yarn guide 40 such as the surface opposing the guide surface 41a of the second guide wall portions 42a, 42b.
In such a case, the yarn detection sensor 50 is required to be
a thin type so as not to interfere with the yarn Y guided to the guide
surface 41a of the first guide wall portion 41, but since the yarn
detection sensor 50 is a reflective optical sensor, the yarn detection
sensor 50 does not greatly project out as much towards the guide surface
41a and is unlikely to interfere with the yarn Y, as opposed to the
case where the yarn detection sensor 50 is a transmissive optical sensor.
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In the embodiment described above, the yarn Y is traversed by the traverse drum 28, but the present invention is not limited thereto, and the yarn Y may be traversed with a different traverse device such as a so-called arm-type traverse device (see Japanese Unexamined Patent Publication No. 2011-126639) adapted to traverse the yarn by swinging the arm, for example.
The yarn winding device according to a second aspect of the invention relates to the yarn winding device according to the first aspect, wherein the yarn detection sensor is attached on a surface on a side opposite to the guide surface of the first guide wall portion; and the first guide wall portion is formed with a light passing section adapted to pass irradiation light from the light emitting unit and reflected light in which the irradiation light is reflected by the yarn to be traversed along the guide surface.
According to the present invention, the yarn detection sensor is arranged on the surface on the side opposite to the guide surface, on which the yarn to be traversed moves, in the yarn guide, and the first guide wall portion is formed with a light through-hole adapted to pass the irradiation light from the light emitting unit and the reflected light to the first guide wall portion, so that the traversed yarn does not make contact with the light emitting unit and the light receiving unit, and damages of the light emitting unit and the light receiving unit are prevented. Furthermore, cotton flies are unlikely to attach to the light emitting unit and the light receiving unit.
The yarn winding device according to a third aspect of the
invention relates to the yarn winding device according to the second
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aspect, wherein the yarn guide includes a second guide wall portion arranged to face the guide surface with the yarn path of the yarn to be traversed therebetween; and the second guide wall portion is arranged to cover a periphery of a portion formed with the light passing hole of the guide surface of the first guide wall portion.
According to the present invention, the second guide wall portion is arranged to cover the light passing section adapted to pass the light of the yarn guide, and hence the damages of the light emitting unit and the light receiving unit are reliably prevented by the second guide wall portion. Furthermore, the cotton flies are more unlikely to attach to the light emitting unit and the light receiving unit.
The yarn winding device according to a fourth aspect of the invention relates to the yarn winding device according to the third aspect, where a through-hole is formed at a portion where the second guide wall portion covers the light passing section of the first guide wall portion.
According to the present invention, the through-hole is formed at the portion covering the light passing section of the second guide wall portion, and thus the yarn detection sensor can be easily cleaned through the through-hole.
The yarn winding device according to a fifth aspect of the invention relates to the yarn winding device according to the third or fourth aspect, where the yarn guide is formed by a plate-like member; and the second guide wall portion is formed by folding back the yarn guide towards the guide surface at an end of the first guide wall portion
with respect to a traverse direction of the yarn by the traverse device.
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According to the present invention, since the second guide wall portion is formed by folding back the plate-like yarn guide at the end with respect to the traverse direction of the first guide wall portion, the first guide wall portion and the second guide wall portion can be formed by one member.
According to the present invention, since the yarn detection sensor is attached to the first guide wall portion of the yarn guide arranged in proximity to the traverse drum, the yarn can be detected at a position close to the traverse guide. Furthermore, since the yarn detection sensor is a reflective sensor, the cleaning of the light emitting surface and the light receiving surface is facilitated compared to the transmissive sensor in which the light emitting unit and the light receiving unit are arranged facing each other. Moreover, if the yarn detection sensor is the reflective sensor, the yarn detection sensor can be arranged so as not to project out from the guide surface, as opposed to the transmissive sensor, when arranged on the yarn guide, and hence the interference with other members can be prevented.
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WE CLAIM:
1. A yarn winding device comprising:
a traverse device adapted to traverse a yarn to be wound into a rotating winding package;
a yarn guide arranged upstream of a yarn path of the traverse device, and includes a first guide wall portion adapted to guide a yarn to be traversed by the traverse device by a guide surface; and
a yarn detection sensor adapted to detect the yarn to be traversed, the yarn detection sensor being configured by a reflective optical sensor including a light emitting unit and a light receiving unit; characterized in that
the yarn detection sensor is attached to the first guide wall portion of the yarn guide.
2. The yarn winding device according to claim 1, wherein
the yarn detection sensor is attached on a surface on a side
opposite to the guide surface of the first guide wall portion; and
the first guide wall portion is formed with a light passing section adapted to pass irradiation light from the light emitting unit and reflected light in which the irradiation light is reflected by the yarn to be traversed along the guide surface.
3. The yarn winding device according to claim 2, wherein
the yarn guide includes a second guide wall portion arranged to
face the guide surface with the yarn path of the yarn to be traversed
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therebetween; and
the second guide wall portion is arranged to cover a periphery of a portion formed with the light passing section of the guide surface of the first guide wall portion.
4. The yarn winding device according to claim 3, wherein a
through-hole is formed at a portion where the second guide wall portion
covers the light passing section of the first guide wall portion.
5. The yarn winding device according to claim 3 or 4, wherein
the yarn guide is formed by a plate-like member; and
the second guide wall portion is formed by folding back the yarn guide towards the guide surface at an end of the first guide wall portion with respect to a traverse direction of the yarn by the traverse device.
6. A yarn winding device, substantially as herein described
with reference to accompanying drawings and examples.
Dated this 26^" day of June 2012
Of^Anand and Anand, Advocates Agents for the Applicants
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