Thread winding machine

Abstract

To provide a thread winding machine than can surely reduce local abrasions of fulcrum guides and reduce costs for reducing the abrasions.SOLUTION: A plurality of fulcrum guides 16 are formed in roller shapes having central axes and are configured so that threads Y are hung on outer peripheral surfaces thereof. One or more fulcrum guides 16 of the plurality of fulcrum guides 16 are configured to freely rotate around the central axes. A thread winding machine is provided with a switching mechanism 30 that inhibits the one or more fulcrum guides 16 from rotating at the time of winding the threads and releases the inhibition of rotating of the one or more fulcrum guides 16 at the time other than the time of winding the threads.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a yarn winding machine that winds a plurality of yarns around a plurality of bobbins mounted on a winding shaft while performing plain swaying with a plurality of fulcrum guides arranged in the axial direction of the winding shaft as fulcrums.

Background Art

[0002] Conventionally, a yarn winding machine that winds a plurality of yarns spun from a spinning device around a plurality of bobbins mounted on a winding shaft while performing plain swaying is known. In such a yarn winding machine, a plurality of fulcrum guides serving as fulcrums when swaying the yarns are provided side by side in the axial direction of the winding shaft. For example, in Patent Documents 1 and 2, roller-shaped fulcrum guides (guide rollers in Patent Document 2) having a central axis extending in a direction orthogonal to the axial direction of the winding shaft are provided, and the yarns are hung on the outer peripheral surface of the fulcrum guides. In Patent Document 1, the fulcrum guide is configured not to rotate around the central axis during yarn winding. Further, in Patent Document 2, the fulcrum guide is a roller that can freely rotate around the central axis.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the fulcrum guide does not rotate during yarn winding as in Patent Document 1, the high-speed running yarn continues to contact the same part of the outer peripheral surface of the fulcrum guide, and local wear of the fulcrum guide tends to progress. As a result, the contact state between the yarn and the fulcrum guide changes, which may lead to a deterioration in the quality of the yarn. In this regard, Patent Document 1 is configured such that the fulcrum guide can be rotated by a motor, and the contact position with the yarn can be changed. However, since a drive unit such as a motor for rotating the fulcrum guide is required, there is a problem that the cost increases.

[0005] On the other hand, since the fulcrum guide of Patent Document 2 is configured to be freely rotatable, the fulcrum guide always rotates due to the friction with the yarn during yarn winding, and local wear can be suppressed. However, since the fulcrum guide is exposed to high-speed rotation, the bearing of the fulcrum guide is likely to be damaged early. For this reason, the cost increase associated with the maintenance of the bearing has been a problem.

[0006] In view of the above problems, an object of the present invention is to provide a yarn winding machine that can reduce local wear of a fulcrum guide and can reduce the cost therefor.

Means for Solving the Problems

[0007] The present invention relates to a yarn winding machine that winds a plurality of yarns while performing cross-winding around a plurality of fulcrum guides arranged in the axial direction of a winding shaft on a plurality of bobbins mounted on the winding shaft. The plurality of fulcrum guides are in the shape of rollers having a central axis, and are configured such that the yarn is wound around the outer peripheral surface thereof. One or more of the plurality of fulcrum guides are configured to be freely rotatable around the central axis, and a switching mechanism is provided that prohibits rotation of the one or more fulcrum guides during yarn winding and releases the prohibition of rotation of the one or more fulcrum guides except during yarn winding.

[0008] According to the present invention, the rotation of one or more fulcrum guides configured to be rotatable freely is prohibited by a switching mechanism during yarn winding. That is, since the fulcrum guides do not rotate at high speed due to the running of the yarn, it is possible to eliminate the need for bearings of the fulcrum guides. Even if bearings are provided, they are not exposed to high-speed rotation for a long time, so early damage can be avoided. Therefore, an increase in cost associated with the maintenance of the bearings can be avoided. Further, in the present invention, since the rotation prohibition of the fulcrum guides is released by the switching mechanism except during yarn winding, if a yarn hanging operation or the like is performed on the fulcrum guides at that time, the fulcrum guides can be easily rotated by utilizing the tension of the yarn when the yarn comes into contact with the fulcrum guides. For this reason, local wear of the fulcrum guides can be reduced, and a drive unit such as a motor for rotating the fulcrum guides becomes unnecessary. As described above, according to the present invention, local wear of the fulcrum guides can be reduced, and the cost therefor can be reduced. Note that it is not essential to rotate the fulcrum guides where local wear is not much of a problem, so such fulcrum guides do not necessarily need to be configured to be rotatable freely.

[0009] In the present invention, it is preferable that the one or more fulcrum guides include two of the fulcrum guides at both ends in the axial direction.

[0010] In a general yarn winding machine, among a plurality of fulcrum guides arranged in the axial direction of the winding shaft, the closer to the end, the larger the winding angle of the yarn, the greater the surface pressure received from the yarn, and wear is likely to be a problem. Therefore, if at least two fulcrum guides at both ends are configured to be rotatable freely, the problem of local wear of the fulcrum guides can be generally solved.

[0011] In the present invention, it is preferable that the one or more fulcrum guides include all of the fulcrum guides.

[0012] In this way, local wear can be surely reduced for all the fulcrum guides.

[0013] In the present invention, the switching mechanism preferably includes a gear portion formed on the fulcrum guide or a holding member that holds the fulcrum guide, an engaging member that engages with the gear portion during winding to prevent rotation of the gear portion, and an engagement release member that releases the engagement between the engaging member and the gear portion except during winding.

[0014] According to such a configuration, by releasing the engagement between the engaging member and the gear portion by the engagement release member, the fulcrum guide can be switched to a freely rotatable state.

[0015] In the present invention, a moving mechanism for moving the plurality of fulcrum guides between a winding position during winding and a threading position during threading work is provided, and the engagement release member preferably maintains a state in which the engagement between the engaging member and the gear portion is released when the plurality of fulcrum guides are located at the threading position.

[0016] According to such a configuration, since the fulcrum guide is in a freely rotatable state during the threading work on the fulcrum guide, the fulcrum guide can be rotated when threading the thread onto the fulcrum guide.

[0017] In the present invention, the moving mechanism preferably includes a plurality of sliders that support the plurality of fulcrum guides, a guide rail to which the plurality of sliders are slidably attached, and a drive unit that moves the plurality of sliders along the guide rail.

[0018] With such a moving mechanism, if the slider is moved along the guide rail, the fulcrum guide can be moved.

[0019] In the present invention, when the plurality of fulcrum guides move from the winding position to the threading position, the sliders adjacent to each other in the longitudinal direction of the guide rail are preferably close to each other.

[0020] According to such a configuration, when the plurality of fulcrum guides are located at the threading position, the plurality of fulcrum guides are gathered in a close state, so that the threading work becomes easy.

[0021] In the present invention, when the plurality of fulcrum guides are located at the winding position, the engaging member has a protruding portion protruding from the slider, and when the plurality of fulcrum guides move from the winding position to the thread hanging position, the adjacent slider presses the protruding portion as the engagement releasing member, so that the engagement between the engaging member and the gear portion may be released.

[0022] According to such a configuration, since the adjacent slider functions as the engagement releasing member, there is no need to newly provide the engagement releasing member, and an increase in the number of parts can be suppressed.

[0023] In the present invention, the engagement releasing member is fixed to the guide rail or a fixing member to which the guide rail is directly or indirectly fixed, and when the plurality of fulcrum guides move from the winding position to the thread hanging position, the engagement releasing member presses the engaging member, so that the engagement between the engaging member and the gear portion may be released.

[0024] According to such a configuration, since the engagement releasing member can be commonly provided for the plurality of fulcrum guides, there is no need to provide the engagement releasing member for each fulcrum guide, and the number of engagement releasing members can be reduced.

[0025] In the present invention, it is preferable that a biasing member for biasing the engaging member in a direction in which the engaging member engages with the gear portion is provided.

[0026] By providing such a biasing member, the rotation of the fulcrum guide during yarn winding can be reliably blocked by the engaging member.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0028] Hereinafter, embodiments in which the thread take-up machine according to the present invention is applied to a spinning take-up device will be described with reference to the drawings.

[0029] (Spinning take-up device) FIG. 1 is a side view of the spinning take-up device according to the present embodiment. In this specification, the front, rear, left, right, upper, and lower directions shown in FIG. 1 are defined as the front, rear, left, right, upper, and lower of the spinning take-up device.

[0030] The spinning take-up device 1 is a device that takes up a plurality of (16 in this embodiment) yarns Y spun from the spinning device 2, and includes godet rollers 3 and 4 and a thread take-up machine 10. The spinning device 2 is disposed above the spinning take-up device 1 and spins a plurality of yarns Y made of synthetic resin. The godet rollers 3 and 4 are disposed below the spinning device 2 and are rotationally driven by a motor (not shown). The plurality of yarns Y spun from the spinning device 2 are sent to the thread take-up machine 10 via the godet rollers 3 and 4.

[0031] The thread take-up machine 10 is disposed below the godet rollers 3 and 4. The thread take-up machine 10 has two bobbin holders 13 (corresponding to the winding shafts of the present invention) that are cantilever supported by a turret 12 built in the machine base 11. The bobbin holder 13 extends in the front-rear direction (corresponding to the axial direction of the present invention), and the rear end thereof is supported by the turret 12. A plurality of bobbins B can be mounted on the bobbin holder 13 in the front-rear direction. The bobbin holder 13 is rotationally driven about the axis by a motor (not shown).

[0032] The turret 12 is a disc-shaped member having a rotation axis parallel to the front-rear direction, and bobbin holders 13 are attached to the upper position and the lower position, which are 180 degrees different in the circumferential direction, respectively. By rotating the turret 12, the two bobbin holders 13 move between the upper position and the lower position. In the bobbin holder 13 in the upper position, a plurality of yarns Y are wound around a plurality of bobbins B to form a plurality of packages P. On the other hand, in the bobbin holder 13 in the lower position, a plurality of packages P are collected and a plurality of new bobbins B are mounted.

[0033] The yarn winding machine 10 has a support frame 14 that is cantilever-supported by the machine base 11. The rear end portion of the support frame 14 is supported by the machine base 11. Above the support frame 14, a guide unit 15 is arranged. In the guide unit 15, a plurality of fulcrum guides 16, the number of which is the same as the number of yarns Y (16 in this embodiment), are arranged side by side in the front-rear direction. In the support frame 14, a plurality of traversing devices 17, the number of which is the same as the number of yarns Y, are arranged side by side in the front-rear direction. The traversing device 17 oscillates the yarn Y in the front-rear direction with the corresponding fulcrum guide 16 as a fulcrum.

[0034] Below the support frame 14, a contact roller 18 that is rotatably supported by the support frame 14 is arranged. The contact roller 18 contacts the outer peripheral surfaces of the plurality of packages P held by the bobbin holder 13 in the upper position. During yarn winding, by rotating the contact roller 18 while applying a predetermined contact pressure to the package P, the shape of the package P can be adjusted.

[0035] (Guide Unit) The configuration of the guide unit 15 will be described. FIG. 2 is a side view of the guide unit 15. Diagram a of FIG. 2 shows a state where a plurality of fulcrum guides 16 are located at the winding position, and diagram b of FIG. 2 shows a state where a plurality of fulcrum guides 16 are located at the thread hanging position. The winding position is the position of the plurality of fulcrum guides 16 when winding a plurality of threads Y around a plurality of bobbins B. The thread hanging position is the position of the plurality of fulcrum guides 16 when hanging a plurality of threads Y on the plurality of fulcrum guides 16. The plurality of fulcrum guides 16 are configured to be movable between the winding position and the thread hanging position by a moving mechanism 20.

[0036] The guide unit 15 is configured to include a plurality of fulcrum guides 16 and a moving mechanism 20. The moving mechanism 20 includes a plurality of sliders 21, a guide rail 22, and an air cylinder 23 (corresponding to the driving part of the present invention). The sliders 21 are provided in the same number as the fulcrum guides 16 and rotatably support the fulcrum guides 16.

[0037] The fulcrum guide 16 protrudes rightward from the slider 21 (see FIG. 5) and is a roller-shaped member having a central axis extending in a direction (left-right direction) orthogonal to the axial direction of the bobbin holder 13. The thread Y is hung on the outer peripheral surface of the fulcrum guide 16, and when winding the thread, the thread Y runs in contact with the outer peripheral surface of the fulcrum guide 16. All the fulcrum guides 16 are configured to be freely rotatable around the central axis.

[0038] The guide rail 22 is a member extending in the front-rear direction (corresponding to the longitudinal direction of the present invention) and is fixed to the support frame 14 via a bracket (not shown). A plurality of sliders 21 are slidably attached to the guide rail 22 in a state of being arranged in the front-rear direction. The sliders 21 adjacent to each other in the front-rear direction are connected to each other by a belt (not shown). The rod 23a of the air cylinder 23 is connected to the rearmost slider 21.

[0039] As shown in Fig. 2(a), when the rod 23a of the air cylinder 23 is retracted, the plurality of sliders 21 are arranged side by side in the front-rear direction in a state of being separated from each other. That is, the plurality of fulcrum guides 16 are also arranged side by side in the front-rear direction in a state of being separated from each other. The positions of the plurality of fulcrum guides 16 at this time are the winding positions. When the plurality of fulcrum guides 16 are located at the winding positions, the contact points between the thread Y and each fulcrum guide 16, that is, the wale vibration fulcrums of the thread Y, are equidistant.

[0040] The thread paths of the plurality of threads Y distributed from the godet roller 4 to the plurality of fulcrum guides 16 located at the winding positions are symmetric with respect to the vertical plane passing through the centers of the plurality of fulcrum guides 16 in the front-rear direction. The eight threads Y in the front half are hung on the front side of the fulcrum guide 16, while the eight threads Y in the rear half are hung on the rear side of the fulcrum guide 16. Also, among the plurality of fulcrum guides 16, the closer to the end, the larger the winding angle of the thread Y. As a result, the surface pressure of the thread Y is large, so wear is likely to occur.

[0041] When performing the thread hanging operation on the plurality of fulcrum guides 16, the air cylinder 23 is driven to extend the rod 23a. Then, the rearmost slider 21 connected to the rod 23a moves forward. Subsequently, the rearmost slider 21 abuts on the slider 21 adjacent to it in front and presses it forward, and the operation in which each slider 21 abuts on the slider 21 adjacent to it in front and presses it forward is repeated. Here, the "abutting" includes not only the form in which the sliders 21 are in direct contact with each other, but also the form in which the sliders 21 are in indirect contact with each other via other members.

[0042] When the foremost slider 21 abuts against a stopper (not shown) provided at the front end of the guide rail 22, the air cylinder 23 stops. As a result, all the sliders 21 gather in a state of being close to each other at the front end of the guide rail 22. The positions of the plurality of fulcrum guides 16 at this time are the threading positions. Since the plurality of fulcrum guides 16 located at the threading positions gather at the front end of the guide rail 22 in a state of being close to each other, the threading operation to the plurality of fulcrum guides 16 is easy to perform. Note that instead of the stopper as described above, the front end of the guide rail 22 may be configured to function as a stopper, or the rod 23a of the air cylinder 23 may be configured to abut against the stopper and stop.

[0043] After the completion of the threading operation, when the air cylinder 23 is driven to contract the rod 23a, the rearmost slider 21 moves rearward. When the belt connecting the rearmost slider 21 and the slider 21 adjacent to it in front stretches, the slider 21 adjacent to it in front is pulled rearward. Thereafter, similarly, as each slider 21 is pulled rearward, the plurality of fulcrum guides 16 return to the winding position shown in FIG. 2(a). Note that the drive unit for moving the slider 21 is not limited to the air cylinder 23, and may be another actuator such as a motor.

[0044] (First Embodiment of the Rotation Mechanism) The first embodiment of the rotation mechanism will be described. FIG. 3 is a diagram showing the operation of the switching mechanism 30 of the first embodiment. FIG. 4 is a cross-sectional view showing the switching mechanism 30 of the first embodiment, showing a cross-section passing through the center of the fulcrum guide 16. FIG. 3(a) shows the state when the fulcrum guide 16 is located at the winding position, and FIG. 3(b) shows the state when the fulcrum guide 16 is located at the threading position. The fulcrum guide 16 shown in FIG. 3 shows the foremost fulcrum guide 16.

[0045] In this embodiment, a switching device 31 is provided on each slider 21, and an assembly of the switching devices 31 provided on each slider 21 is a switching mechanism 30. The switching device 31 includes a gear portion 32a formed on a holding member 32 that holds the fulcrum guide 16, an engaging member 33 provided on the slider 21, and an adjacent slider 21 that functions as an engagement release member of the present invention.

[0046] As shown in FIG. 4, the fulcrum guide 16 is fixed to the holding member 32 and can rotate integrally with the holding member 32. The holding member 32 is attached to a mounting hole 21a formed on the surface (right surface) of the slider 21. A gear portion 32a is formed on a portion of the holding member 32 on the back side (left side) of the surface of the slider 21. The frictional force between the holding member 32 and the slider 21 is set to a small value such that the holding member 32 can freely rotate around the central axis of the fulcrum guide 16. Thereby, the fulcrum guide 16 can freely rotate around the central axis. Note that a bearing for rotating the holding member 32 more smoothly may be provided in the mounting hole 21a.

[0047] The engaging member 33 is a member that blocks the rotation of the gear portion 32a by engaging with the gear portion 32a. The engaging member 33 is a member in which a protruding portion 33a, an engaging portion 33b, and a connecting portion 33c are integrally formed. The protruding portion 33a is a portion that protrudes rearward from the slider 21 when the fulcrum guide 16 is in the winding position. The engaging portion 33b is a portion that meshes with the gear portion 32a to block the rotation of the gear portion 32a. The connecting portion 33c is a portion that connects the protruding portion 33a and the engaging portion 33b. Note that it is not essential for the protruding portion 33a to protrude rearward, and it may protrude in other directions as long as it is in a position pressed by the adjacent slider 21 behind.

[0048] On the surface of the slider 21, a guide groove 21b extending in the front-rear direction is formed. A part of the protruding portion 33a and the connecting portion 33c (the portion extending in the front-rear direction) is slidably engaged with the guide groove 21b. Thus, the engaging member 33 is movable in the front-rear direction along the guide groove 21b. The remaining portions of the engaging portion 33b and the connecting portion 33c are disposed on the back side of the slider 21.

[0049] The engaging member 33 is biased rearward by a spring 34, that is, in the direction in which the protruding portion 33a protrudes from the slider 21. This spring 34 (corresponding to the biasing member of the present invention) also functions as a member that biases the engaging member 33 in the direction in which the engaging portion 33b engages with the gear portion 32a.

[0050] The fulcrum guide 16 shown in FIG. 3 is subjected to a torque in the counterclockwise direction in FIG. 3 by the running of the thread Y during winding. To prevent the fulcrum guide 16 from rotating due to this torque, the rotation of the fulcrum guide 16 is prohibited by the switching mechanism 30 during winding. Specifically, as shown in FIG. 3(a), the engaging member 33 is biased rearward by the spring 34, so that the engaging portion 33b meshes with the gear portion 32a and the rotation of the fulcrum guide 16 is prohibited.

[0051] When the fulcrum guide 16 moves from the winding position to the thread hanging position, the protruding portion 33a of the engaging member 33 is pressed forward by the adjacent slider 21. Then, the engaging member 33 moves forward, the engaging portion 33b disengages from the gear portion 32a, and the engagement between the engaging member 33 and the gear portion 32a is released. As a result, when the fulcrum guide 16 is in the thread hanging position, as shown in FIG. 3(b), the fulcrum guide 16 is in a freely rotatable state. Therefore, during the thread hanging operation on the fulcrum guide 16, when the thread Y contacts the outer circumference of the fulcrum guide 16, the fulcrum guide 16 can be easily rotated by the tension of the thread Y. Accordingly, the position where the thread Y contacts the fulcrum guide 16 during the next winding can be changed from the position during the previous winding, and the progress of local wear of the fulcrum guide 16 can be suppressed.

[0052] After finishing the threading operation to the fulcrum guide 16 and returning the fulcrum guide 16 from the threading position to the winding position, the adjacent slider 21 moves away. Then, due to the biasing force of the spring 34, the engaging member 33 moves rearward, the protruding portion 33a protrudes rearward from the slider 21, and the engaging portion 33b meshes with the gear portion 32a. When the fulcrum guide 16 returns to the winding position and the winding of the thread Y starts, a counterclockwise torque acts on the fulcrum guide 16 due to the running of the thread Y. However, since the rotation of the fulcrum guide 16 is blocked by the engaging member 33, the fulcrum guide 16 does not rotate.

[0053] In addition, in this embodiment, a part including the gear portion 32a and the engaging portion 33b of the engaging member 33 is provided on the back side of the slider 21, but these may be provided on the front side of the slider 21. Further, for the rearmost fulcrum guide 16, since there is no adjacent slider 21 behind it, it is preferable to reverse the front-back arrangement of the engaging member 33 shown in FIG. 3. In this case, the adjacent slider 21 in front functions as an engagement release member.

[0054] (Effect of the First Embodiment) The effects of this embodiment will be described. In this embodiment, the rotation of one or more freely rotatable fulcrum guides 16 is prohibited by the switching mechanism 30 during thread winding. That is, since the fulcrum guide 16 does not rotate at high speed due to the running of the thread Y, it is possible to eliminate the bearing of the fulcrum guide 16, and even if a bearing is provided, it is not exposed to high-speed rotation for a long time, so early damage can be avoided. Therefore, an increase in cost associated with bearing maintenance can be avoided. Further, in this embodiment, since the rotation prohibition of the fulcrum guide 16 is released by the switching mechanism 30 except during thread winding, if a threading operation or the like is performed on the fulcrum guide 16 at that time, the fulcrum guide 16 can be easily rotated by utilizing the tension of the thread Y when the thread Y contacts the fulcrum guide 16. For this reason, local wear of the fulcrum guide 16 can be reduced, and a driving part such as a motor for rotating the fulcrum guide 16 becomes unnecessary. As described above, according to this embodiment, local wear of the fulcrum guide 16 can be reduced, and the cost therefor can be reduced.

[0055] In this embodiment, the above one or more fulcrum guides 16 include two fulcrum guides 16 at both ends in the axial direction. In a general yarn winding machine 10, among the plurality of fulcrum guides 16 arranged in the axial direction of the bobbin holder 13, the closer to the end, the larger the winding angle of the yarn Y, resulting in a larger surface pressure received from the yarn Y and a higher likelihood of wear becoming a problem. Therefore, if at least the two fulcrum guides 16 at both ends are configured to be freely rotatable, the problem of local wear of the fulcrum guides 16 can be generally solved.

[0056] In this embodiment, the above one or more fulcrum guides 16 include all the fulcrum guides 16. In this way, local wear can be surely reduced for all the fulcrum guides 16.

[0057] In this embodiment, the switching mechanism 30 includes a gear portion 32a formed on a holding member 32 that holds the fulcrum guide 16, an engaging member 33 that engages with the gear portion 32a during yarn winding to prevent the rotation of the gear portion 32a, and an engagement releasing member (adjacent slider 21) that releases the engagement between the engaging member 33 and the gear portion 32a other than during yarn winding. According to such a configuration, by releasing the engagement between the engaging member 33 and the gear portion 32a by the engagement releasing member, the fulcrum guide 16 can be switched to a freely rotatable state.

[0058] In this embodiment, a moving mechanism 20 is provided for moving the plurality of fulcrum guides 16 between the winding position during yarn winding and the threading position during threading work, and the engagement releasing member (adjacent slider 21) maintains the state where the engagement between the engaging member 33 and the gear portion 32a is released when the plurality of fulcrum guides 16 are located at the threading position. According to such a configuration, since the fulcrum guide 16 is in a freely rotatable state during the threading work on the fulcrum guide 16, the fulcrum guide 16 can be rotated when the yarn Y is hung on the fulcrum guide 16.

[0059] In this embodiment, the moving mechanism 20 includes a plurality of sliders 21 that support a plurality of fulcrum guides 16, a guide rail 22 to which the plurality of sliders 21 are slidably attached, and an air cylinder 23 that moves the plurality of sliders 21 along the guide rail 22. With such a moving mechanism 20, if the slider 21 is moved along the guide rail 22, the fulcrum guide 16 can be moved.

[0060] In this embodiment, when the plurality of fulcrum guides 16 move from the winding position to the threading position, the sliders 21 adjacent to each other in the longitudinal direction (front-rear direction) of the guide rail 22 approach each other. According to such a configuration, when the plurality of fulcrum guides 16 are located at the threading position, the plurality of fulcrum guides 16 are gathered in a state of being close to each other, so that the threading operation becomes easy.

[0061] In this embodiment, the engaging member 33 has a protruding portion 33a that protrudes from the slider 21 when the plurality of fulcrum guides 16 are located at the winding position. When the plurality of fulcrum guides 16 move from the winding position to the threading position, the engaging member 33 and the gear portion 32a are disengaged by the adjacent slider 21 pressing the protruding portion 33a as an engagement release member. According to such a configuration, since the adjacent slider 21 functions as an engagement release member, it is not necessary to newly provide an engagement release member, and an increase in the number of parts can be suppressed.

[0062] In this embodiment, a spring 34 is provided that biases the engaging member 33 in the direction in which the engaging member 33 engages with the gear portion 32a. By providing such a spring 34, the rotation of the fulcrum guide 16 can be reliably blocked by the engaging member 33 during thread winding.

[0063] (Second Embodiment of the Rotating Mechanism) A second embodiment of the rotation mechanism will be described. Regarding the configuration common to the first embodiment, the description will be omitted as appropriate, and the points different from the first embodiment will be mainly described. FIG. 5 is a diagram showing the operation of the switching mechanism 40 of the second embodiment. FIGS. 5(a) and 5(b) both show a state in which the fulcrum guide 16 is moving from the winding position to the threading position. FIG. 6 is a diagram showing the arrangement of the engagement release member 44 of the second embodiment.

[0064] The switching mechanism 40 of this embodiment includes a gear portion 42a formed on a holding member 42 that holds each fulcrum guide 16, an engagement member 43 provided on each slider 21, and one engagement release member 44 fixed to the guide rail 22. In this embodiment, the gear portion 42a and the engagement member 43 are arranged on the back side (left side) of the slider 21, but these members may be arranged on the front side (right side) of the slider 21.

[0065] The fulcrum guide 16 and the holding member 32 have the same configuration as in the first embodiment, and the fulcrum guide 16 is freely rotatable around the central axis. The engagement member 43 is a member that blocks the rotation of the gear portion 42a by engaging with the gear portion 42a, and is provided on each slider 21. The engagement member 43 is a long member, one end thereof being the pressed portion 43a and the other end being the engagement portion 43b. The pressed portion 43a protrudes downward from the slider 21 and is pressed by the engagement release member 44 in the process of the fulcrum guide 16 moving from the winding position to the threading position. The engagement portion 43b is a portion that meshes with the gear portion 42a to block the rotation of the gear portion 42a. A fulcrum 45 is arranged at the central portion of the engagement member 43, and the engagement member 43 is configured to be rotatable around the fulcrum 45. A spring 46 is connected to the engagement member 43, and the spring 46 biases the engagement portion 43b in the direction of engaging with the gear portion 42a.

[0066] The engagement release member 44 is fixed to the front end portion of the guide rail 22 and extends rearward from the front end portion of the guide rail 22. The rear end portion of the engagement release member 44 is a pressing portion 44a that presses the pressed portion 43a of each engagement member 43. The pressing portion 44a of the engagement release member 44 is disposed in front of the engagement member 43 when the plurality of fulcrum guides 16 are in the winding position. Further, the portion of the engagement release member 44 extending in the front-rear direction is disposed at a position slightly below the slider 21. For this reason, the engagement release member 44 does not contact the slider 21 but can contact the pressed portion 43a of the engagement member 43. Note that the pressed portion 43a may protrude upward from the slider 21. In this case, the portion of the engagement release member 44 extending in the front-rear direction is disposed above the slider 21.

[0067] When the fulcrum guide 16 is in the winding position, the engaging portion 43b of the engaging member 43 is engaged with the gear portion 42a by the biasing force of the spring 46. Even after the fulcrum guide 16 starts to move from the winding position to the thread-hanging position, until the pressed portion 43a of the engaging member 43 contacts the pressing portion 44a of the engagement release member 44, the engagement state between the engaging member 43 and the gear portion 42a is maintained as shown in FIG. 5(a). When the pressed portion 43a of the engaging member 43 contacts the pressing portion 44a of the engagement release member 44 during the movement of the fulcrum guide 16 from the winding position to the thread-hanging position, as shown in FIG. 5(b), the pressed portion 43a is pressed rearward, so that the engaging member 43 rotates counterclockwise in FIG. 5 about the fulcrum 45. As a result, the engaging portion 43b of the engaging member 43 disengages from the gear portion 42a, and the fulcrum guide 16 is switched to a state where it can rotate freely.

[0068] As shown in Fig. 6, when all the fulcrum guides 16 move to the thread - hanging position, all the engaging members 43 are disengaged from the gear portion 42a, and the fulcrum guides 16 are in a freely rotatable state. Therefore, during the thread - hanging operation on the fulcrum guides 16, when the thread Y contacts the outer circumferential surface of the fulcrum guide 16, the fulcrum guide 16 can be easily rotated by the tension of the thread Y. Thus, the position where the thread Y contacts the fulcrum guide 16 during the next thread winding can be changed from the position during the previous thread winding, and the progress of local wear of the fulcrum guide 16 can be suppressed.

[0069] After finishing the thread - hanging operation on the fulcrum guide 16 and returning the fulcrum guide 16 from the thread - hanging position to the winding position, during this process, the engaging member 43 of each slider 21 separates from the engagement - releasing member 44. Then, by the biasing force of the spring 46, the engaging member 43 rotates clockwise, and the engaging portion 43b of the engaging member 43 meshes with the gear portion 42a. Therefore, even when the fulcrum guide 16 returns to the winding position and the winding of the thread Y starts, the fulcrum guide 16 does not rotate at high speed due to the running of the thread Y.

[0070] (Effect of the Second Embodiment) The effect of this embodiment will be described. The description of the effect due to the configuration common to the first embodiment is omitted. In this embodiment, the engagement - releasing member 44 is fixed to the guide rail 22. When a plurality of fulcrum guides 16 move from the winding position to the thread - hanging position, the engagement - releasing member 44 presses the engaging member 43, thereby releasing the engagement between the engaging member 43 and the gear portion 42a. According to such a configuration, the engagement - releasing member 44 can be commonly provided for a plurality of fulcrum guides 16. Therefore, it is not necessary to provide the engagement - releasing member 44 for each fulcrum guide 16, and the number of engagement - releasing members 44 can be reduced. In this embodiment, only one engagement - releasing member 44 is provided, but two or more engagement - releasing members 44 may be provided. Also, it is not essential to fix the engagement - releasing member 44 to the guide rail 22. The engagement - releasing member 44 may be fixed to a fixing member (such as the support frame 14, etc.) to which the guide rail 22 is directly or indirectly fixed.

[0071] (Other Embodiments) A modified example in which various modifications are made to the above-described embodiment will be described.

[0072] In the above embodiment, the gear portions 32a and 42a are formed on the outer peripheral surfaces of the holding members 32 and 42 that hold the fulcrum guide 16. However, the gear portion may be formed on the outer peripheral surface of the fulcrum guide 16.

[0073] In the above embodiment, when a plurality of fulcrum guides 16 move from the winding position to the threading position, the switching mechanisms 30 and 40 switch the fulcrum guide 16 to a freely rotatable state. However, the fulcrum guide 16 may be switched to a freely rotatable state other than when the fulcrum guide 16 moves. For example, when the fulcrum guide 16 is located at the winding position and the thread Y is not being wound, the fulcrum guide 16 may be switched to a freely rotatable state. In this case, a driving unit such as a motor that drives the engaging members 33 and 43 in the above embodiment may be provided, and the fulcrum guide 16 may be switched to a freely rotatable state by operating this driving unit. Further, when such a configuration is adopted, it is not essential that the plurality of fulcrum guides 16 are configured to move between the winding position and the threading position.

[0074] In the above embodiment, the switching mechanisms 30 and 40 switch all the fulcrum guides 16 to a freely rotatable state other than during thread winding. However, the switching mechanisms 30 and 40 may switch only some of the fulcrum guides 16 (for example, the fulcrum guides 16 at both ends) that are likely to have local wear problems to a freely rotatable state. In this case, the other fulcrum guides 16 do not need to be freely rotatable and may be fixed to the slider 21.

[0075] In the above-described embodiment, when the plurality of fulcrum guides 16 are located at the thread winding positions, it is assumed that the plurality of fulcrum guides 16 gather at the front end portion of the guide rail 22 in a state of being close to each other. However, when the adjacent slider 21 is not made to function as an engagement release member, it is not essential for the plurality of fulcrum guides 16 to be close to each other at the thread winding positions. That is, even when the plurality of fulcrum guides 16 move integrally between the winding position and the thread winding positions without changing the interval between them, the present invention can be applied.

Explanation of Signs

[0076] 10: Thread winding machine 13: Bobbin holder (winding shaft) 16: Fulcrum guide 20: Moving mechanism 21: Slider 22: Guide rail 23: Air cylinder (driving part) 30, 40: Switching mechanism 32, 42: Holding member 32a, 42a: Gear part 33, 43: Engaging member 33a: Protruding part 34, 46: Spring (biasing member) 44: Engagement release member B: Bobbin Y: Thread

Claims

1. In a yarn winding machine that winds a plurality of yarns while performing plain-weave oscillation around a plurality of fulcrum guides arranged in the axial direction of the winding shaft on a plurality of bobbins mounted on the winding shaft, the plurality of fulcrum guides are roller-shaped with a central axis, and are configured such that the yarn is wound around the outer peripheral surface thereof, one or more of the plurality of fulcrum guides are configured to be rotatable freely around the central axis, a switching mechanism is provided that prohibits rotation of the one or more fulcrum guides during yarn winding and releases the rotation prohibition of the one or more fulcrum guides except during yarn winding, the yarn winding machine, wherein the one or more fulcrum guides are in a freely rotatable state when the rotation prohibition is released by the switching mechanism.

2. The yarn winding machine according to claim 1, wherein the one or more fulcrum guides include two of the fulcrum guides at both ends in the axial direction.

3. The yarn winding machine according to claim 2, wherein the one or more fulcrum guides include all of the fulcrum guides.

4. The switching mechanism includes a gear portion formed on the fulcrum guide or a holding member that holds the fulcrum guide, an engaging member that engages with the gear portion during yarn winding to prevent rotation of the gear portion, and an engagement release member that releases the engagement between the engaging member and the gear portion except during yarn winding, and is characterized by having the above, and is the yarn winding machine according to any one of claims 1 to 3.

5. The yarn winding machine includes a moving mechanism that moves the plurality of fulcrum guides between a winding position during yarn winding and a yarn hanging position during yarn hanging operation, and the engagement release member maintains a state in which the engagement between the engaging member and the gear portion is released when the plurality of fulcrum guides are in the yarn hanging position, and is the yarn winding machine according to claim 4.

6. The moving mechanism includes a plurality of sliders that support the plurality of fulcrum guides, a guide rail on which the plurality of sliders are slidably attached, and a drive portion that moves the plurality of sliders along the guide rail, and is characterized by having the above, and is the yarn winding machine according to claim 5.

7. The yarn winding machine according to claim 6, wherein when the plurality of fulcrum guides move from the winding position to the yarn hanging position, the sliders adjacent to each other in the longitudinal direction of the guide rail approach each other.

8. The engaging member has a protruding portion protruding from the slider when the plurality of fulcrum guides are located at the winding position. When the plurality of fulcrum guides move from the winding position to the thread-hanging position, the engagement between the engaging member and the gear portion is released by the adjacent slider pressing the protruding portion as the engagement release member. The thread winder according to claim 7, characterized in that.

9. The engagement release member is fixed to the guide rail or a fixing member to which the guide rail is directly or indirectly fixed. When the plurality of fulcrum guides move from the winding position to the thread-hanging position, the engagement between the engaging member and the gear portion is released by the engagement release member pressing the engaging member. The thread winder according to claim 6 or 7, characterized in that.

10. The thread winder according to any one of claims 4 to 9, characterized in that a biasing member for biasing the engaging member in a direction in which the engaging member engages with the gear portion is provided.

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