CN114808168A

CN114808168A - Yarn guide and yarn winding machine

Info

Publication number: CN114808168A
Application number: CN202111587418.3A
Authority: CN
Inventors: 田中竣也; 加贺田翔; 松井崇伦; 米仓踏青; 小林秀平
Original assignee: TMT Machinery Inc
Current assignee: TMT Machinery Inc
Priority date: 2021-01-21
Filing date: 2021-12-23
Publication date: 2022-07-29
Also published as: EP4032843A1; JP2022112481A

Abstract

The invention relates to a yarn guide and a yarn winding machine, which can suppress the change of the quality of the yarn at low cost. The yarn guide (16) has a fulcrum yarn guide (31) serving as a fulcrum when the yarn is wound around a bobbin while traversing, wherein the fulcrum yarn guide (31) has a cylindrical shape and is rotatable about a central axis, the yarn guide (16) is provided with a rotational resistance applying mechanism (37), and when the fulcrum yarn guide (31) receives a torque of a predetermined value or more from the yarn traveling while being in contact with the outer peripheral surface of the fulcrum yarn guide (31), the rotational resistance applying mechanism (37) applies rotational resistance to the fulcrum yarn guide (31) so that the fulcrum yarn guide (31) is rotated in a driven manner at a peripheral speed slower than the traveling speed of the yarn.

Description

Yarn guide and yarn winding machine

Technical Field

The present invention relates to a yarn guide having a fulcrum yarn guide serving as a fulcrum when winding a yarn around a bobbin while traversing the yarn, and a yarn winding machine including the yarn guide.

Background

Conventionally, there is known a yarn winding machine that winds a yarn spun from a spinning device around a bobbin while traversing the yarn. Such a yarn winding machine is provided with a fulcrum guide serving as a fulcrum when the yarn is traversed. For example, in

patent documents

1 and 2, a cylindrical fulcrum guide (a guide roller in patent document 2) is provided, and a yarn is hooked on an outer peripheral surface of the fulcrum guide.

In patent document 1, the fulcrum guide is configured not to rotate around the central axis when the wire is wound. Therefore, the wire running at a high speed is continuously in contact with the same portion of the outer peripheral surface of the fulcrum guide, and local abrasion easily progresses in the fulcrum guide. As a result, the contact state of the yarn with the fulcrum guide is changed, and the quality of the yarn may be degraded. Therefore, in patent document 1, the fulcrum guide can be rotated by a motor, and the contact position with the wire can be changed. However, in patent document 1, a driving unit such as a motor for rotating the fulcrum guide is required, which causes a problem of high cost.

On the other hand, in patent document 2, the fulcrum guide is a roller that is rotatable around a central axis. Therefore, the fulcrum guide is rotated constantly by friction with the wire at the time of winding the wire, and local abrasion can be suppressed. Further, by using the roller that can freely rotate, a driving portion for rotating the fulcrum guide is not required, and cost can be suppressed.

Patent document 1: japanese patent laid-open publication No. 2013-23787

Patent document 2: japanese Kohyo publication No. 2008-531438

However, in patent document 2, the fulcrum guide requires a precise bearing structure so as to be able to withstand high-speed rotation. The precision bearing structure is likely to be deteriorated, and as a result, the rotation speed of the fulcrum guide is reduced during winding of the yarn, and the quality of the yarn may be unexpectedly changed.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a yarn guide that can suppress variation in yarn quality at low cost.

The present invention is a yarn guide having a fulcrum yarn guide serving as a fulcrum when a yarn is wound around a bobbin while traversing, wherein the fulcrum yarn guide has a cylindrical shape and is rotatable about a central axis, and wherein the yarn guide is provided with a rotational resistance applying mechanism that applies rotational resistance to the fulcrum yarn guide so that the fulcrum yarn guide is rotated at a peripheral speed slower than a traveling speed of the yarn when the fulcrum yarn guide receives a torque equal to or greater than a predetermined value from the yarn traveling while contacting an outer peripheral surface of the fulcrum yarn guide.

According to the present invention, since the fulcrum wire guide is rotated in a driven manner when receiving a torque of a predetermined value or more from the wire, a portion of the outer peripheral surface of the fulcrum wire guide, which the wire contacts, can be changed, and local wear of the fulcrum wire guide can be suppressed. Further, since a driving unit such as a motor for rotating the fulcrum guide is not required, the cost can be reduced. Further, the rotation resistance applying mechanism rotates the fulcrum guide at a peripheral speed slower than the advancing speed of the yarn, so that the frictional characteristic between the fulcrum guide and the yarn is substantially constant and almost constant as compared with the case where the fulcrum guide is fixed. Therefore, even if the rotation speed of the fulcrum guide slightly fluctuates, the quality of the yarn can be prevented from changing. As described above, according to the present invention, it is possible to suppress the variation in the quality of the yarn at low cost.

In the present invention, the rotational resistance applying means may apply rotational resistance to the fulcrum guide such that a circumferential speed of the fulcrum guide is preferably 5% or less, more preferably 3.5% or less of a running speed of the yarn.

If the peripheral speed of the fulcrum guide is sufficiently low to be 5% or less of the advancing speed of the yarn, the change in the quality of the yarn can be more effectively suppressed.

In the present invention, the rotation resistance applying mechanism may apply rotation resistance to the fulcrum guide such that the rotation speed of the fulcrum guide is preferably 7400rpm or less, more preferably 5000 rpm.

When the rotation speed of the fulcrum wire guide is high, the fulcrum wire guide and other components in contact with the fulcrum wire guide are easily worn, and there is a possibility that smooth rotation of the fulcrum wire guide is hindered. Therefore, as described above, by reducing the rotation speed of the fulcrum guide to 7400rpm or less, the wear of the fulcrum guide and other components in contact with the fulcrum guide can be suppressed, and the fulcrum guide can be continuously and smoothly rotated.

In the present invention, the rotational resistance applying mechanism may include: a pressed portion disposed on one axial side of the fulcrum guide; and a pressing member that presses the fulcrum guide toward the pressed portion.

With this configuration, the fulcrum guide can be applied with rotational resistance by the pressing force of the pressing member.

In the present invention, an intervening member may be disposed between the fulcrum guide and the pressed portion and/or between the fulcrum guide and the pressing member.

With this configuration, the pressing force acting on the fulcrum guide can be adjusted by the shape, size, material, and the like of the interposed member, and the rotational speed and circumferential speed of the fulcrum guide can be easily adjusted.

In the present invention, the interposed member may include: a thrust bearing part which is abutted with the end surface of the fulcrum thread guide; and a radial bearing portion which abuts against an inner peripheral surface of the fulcrum guide.

By providing the thrust bearing portion and the radial bearing portion in the interposed member, the fulcrum guide can be rotated more smoothly.

In the present invention, the pressing member may be a spring.

By using the spring as the pressing member, the pressing force acting on the fulcrum guide can be easily adjusted, and the rotational speed and the circumferential speed of the fulcrum guide can be easily adjusted.

In the present invention, the pressed portion may be integrally formed on a member that rotatably supports the fulcrum guide.

With this configuration, the guide wire body can be manufactured with a small number of components.

In the present invention, the rotational resistance applying means may be a contact portion formed between another member that is in contact with the fulcrum guide and the fulcrum guide, and the frictional force may be adjusted in the contact portion so that the peripheral speed of the fulcrum guide is slower than the advancing speed of the yarn.

With this configuration, the pressing member is not required, and the guide wire body can be manufactured with a small number of components.

In the present invention, the contact portion of the rotational resistance applying means may be formed between an inner peripheral surface of the fulcrum guide and another member that contacts the inner peripheral surface of the fulcrum guide.

In general, the area of the inner peripheral surface of the fulcrum wire guide is larger than the area of the end surface, and therefore, the frictional force can be easily adjusted by using the inner peripheral surface of the fulcrum wire guide as the rotation resistance applying mechanism.

In the present invention, an intervening member may be disposed between a member that rotatably supports the fulcrum guide and the fulcrum guide, and the contact portion as the rotation resistance applying mechanism may be formed between an inner peripheral surface of the fulcrum guide and the intervening member.

With this configuration, the frictional force at the contact portion can be adjusted by the shape, size, material, and the like of the interposed member, and the rotational speed and circumferential speed of the fulcrum guide can be easily adjusted.

The present invention is a yarn winding machine for winding a plurality of yarns on a plurality of bobbins attached to a winding shaft, wherein a plurality of yarn guide bodies are arranged in the axial direction of the winding shaft.

According to the yarn winding machine, the quality of the yarn can be prevented from changing at low cost.

Drawings

Fig. 1 is a side view of the spinning draft device of the present embodiment.

Fig. 2 is a side view of a guide wire unit.

FIG. 3 is a cross-sectional view of the guidewire body.

Fig. 4 is a graph showing the results of a verification experiment for the physical properties of the yarn.

Fig. 5 is a cross-sectional view of a modified example of the wire guide body.

Fig. 6 is a diagram showing the results of a verification experiment of the modification.

Description of the symbols

10: a wire winder; 13: bobbin holders (take-up spools); 16: a wire guide body; 31: a fulcrum thread guide; 33 a: a shaft portion; 33 b: a flange portion (pressed portion); 34. 35: a clamping member; 34a, 35 a: a thrust bearing portion; 34b, 35 b: a radial bearing portion; 36: a spring (pressing member); 37: a rotational resistance applying mechanism; 41. 42: a contact portion (rotation resistance applying mechanism); b: a bobbin; y: and (4) silk threads.

Detailed Description

Hereinafter, an embodiment in which a yarn winding machine having a yarn guide of the present invention is applied to a spinning draft device will be described with reference to the drawings.

(spinning traction device)

Fig. 1 is a side view of a spinning draft device 1 according to the present embodiment. In the present specification, each direction of the front, rear, left, right, up and down shown in fig. 1 is defined as the front, rear, left, right, up and down of the spinning draft device 1.

The spinning and drawing device 1 is a device that draws a plurality of (16 in the present embodiment) yarns Y spun from the spinning device 2, and includes

godet rollers

3 and 4 and a yarn winding machine 10. The spinning device 2 is disposed above the spinning draft 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 yarn winding machine 10 via the

godets

3 and 4.

The yarn winding machine 10 is disposed below the

godet rollers

3 and 4. The yarn winding machine 10 includes two bobbin holders 13 (winding shafts of the present invention) cantilevered by a turn table 12 built in a machine body 11. The bobbin holder 13 extends in the front-rear direction, and the rear end portion thereof is supported by the turn table 12. The bobbin holder 13 is configured to be able to mount a plurality of bobbins B in the front-rear direction. The bobbin holder 13 is driven to rotate around the shaft by a motor not shown.

The turn table 12 is a disk-shaped member having a rotation axis parallel to the front-rear direction, and the bobbin holders 13 are attached to an upper position and a lower position which are different by 180 degrees in the circumferential direction, respectively. By rotating the turntable 12, the two bobbin holders 13 are thereby moved between the upper position and the lower position. In the bobbin holder 13 at the upper position, the plurality of yarns Y are wound around the plurality of bobbins B to form a plurality of packages P. On the other hand, in the bobbin holder 13 at the lower position, the collection of the plurality of packages P and the mounting of the new plurality of bobbins B are performed.

The thread take-up 10 has a support frame 14 cantilevered to the body 11. The rear end of the support frame 14 is supported by the body 11. A guide wire unit 15 is disposed above the support frame 14. The yarn guide units 15 are provided with the same number of yarn guides 16 as the number of yarns Y arranged in the front-rear direction. The traverse devices 17 are arranged in the support frame 14 in the front-rear direction in the same number as the number of the yarns Y. The traverse device 17 traverses the yarn Y in the front-rear direction with the corresponding yarn guide 16 as a fulcrum.

A contact roller 18 supported rotatably by the support frame 14 is disposed below the support frame 14. The contact roller 18 contacts the outer peripheral surface of the plurality of packages P held by the bobbin holder 13 at the upper position. At the time of winding the yarn, the contact roller 18 rotates while applying a predetermined contact pressure to the package P, thereby adjusting the shape of the package P.

(guide wire unit)

The configuration of the guide wire unit 15 will be explained. Fig. 2 is a side view of the guide wire unit 15. Fig. 2 (a) shows a state where the plurality of thread guides 16 are located at the winding position, and fig. 2 (b) shows a state where the plurality of thread guides 16 are located at the yarn hooking position. The winding position is a position of the plurality of yarn guides 16 when the plurality of yarns Y are wound around the plurality of bobbins B. The yarn hooking position is a position of the plurality of yarn guides 16 when the plurality of yarns Y are hooked on the plurality of yarn guides 16. The plurality of yarn guides 16 are configured to be movable between a winding position and a yarn hooking position.

The yarn guide unit 15 includes a plurality of yarn guide bodies 16, a plurality of sliders 21, a guide rail 22, and an air cylinder 23. The same number of sliders 21 as the number of the thread guides 16 are provided, and each thread guide 16 is attached to the corresponding slider 21. The guide rail 22 is a member extending in the front-rear direction, 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 are connected to each other by a belt, not shown. The air cylinder 23 is a driving device for moving the plurality of thread guides 16 between the winding position and the thread guiding position. The rod 23a of the air cylinder 23 is coupled to the rearmost slider 21. The driving device for moving the plurality of yarn guides 16 is not limited to the air cylinder 23, and may be another actuator such as a motor.

As shown in fig. 2 (a), when the rod 23a of the air cylinder 23 contracts, the plurality of sliders 21 are arranged in the front-rear direction while being separated from each other. The positions of the plurality of thread guides 16 at this time are winding positions. On the other hand, as shown in fig. 2 (b), when the rod 23a of the cylinder 23 extends, the plurality of sliders 21 are gathered at the distal end portion of the guide rail 22. The positions of the plurality of thread guides 16 at this time are thread hanging positions.

As shown in fig. 2 (a), the yarn paths of the plurality of yarns Y distributed from the godet roll 4 to the plurality of godets 16 located at the take-up position are substantially symmetrical in the front-rear direction with respect to a vertical plane passing through the centers of the plurality of godets 16. The front half of the 8 threads Y are hooked to the front side of the thread guide 16, and the rear half of the 8 threads Y are hooked to the rear side of the thread guide 16. Further, of the plurality of wire members 16, the wire member closer to the end portion has a larger contact angle (wrapping angle) with the yarn Y, and the wire member closer to the center has a smaller contact angle (wrapping angle) with the yarn Y.

(thread guide)

The details of the wire guide 16 will be described. Fig. 3 is a cross-sectional view of the guidewire body 16. The guide wire body 16 includes a fulcrum guide 31, a fixing member 32, and a shaft member 33. The fulcrum guide 31 has a cylindrical shape extending in the left-right direction, and is supported by a shaft member 33 so as to be rotatable about the central axis. The yarn Y is hooked on the outer peripheral surface of the fulcrum guide 31 and travels in contact with the outer peripheral surface of the fulcrum guide 31 during winding of the yarn. The fulcrum wire guide 31 is configured to be rotated at a peripheral speed slower than the advancing speed of the yarn Y when the yarn Y, which advances while contacting the outer peripheral surface of the fulcrum wire guide 31, receives a torque equal to or greater than a predetermined value.

The fixing member 32 has a cylindrical small diameter portion 32a and a cylindrical large diameter portion 32 b. The small diameter portion 32a is inserted into a circular mounting hole 21a formed in the slider 21. An annular recess 32c is formed at the right end of the large diameter portion 32 b. A spring 36 (a pressing member of the present invention) is disposed in the recess 32 c. A female screw portion 32d penetrating in the left-right direction is formed in the fixing member 32. The fixing member 32 is fixed to the slider 21 by a bolt not shown in the figure in a state where the small diameter portion 32a is inserted from the right side of the mounting hole 21a and the flange surface of the large diameter portion 32b is in contact with the slider 21.

The shaft member 33 is a member in which a shaft portion 33a and a flange portion 33b (a pressed portion of the present invention) are integrally formed. The shaft portion 33a has a cylindrical shape extending in the left-right direction. The shaft portion 33a rotatably supports the fulcrum guide 31 externally fitted to the shaft portion 33 a. The flange portion 33b is an annular portion extending radially outward of the shaft portion 33a from the right end of the shaft portion 33 a. The shaft member 33 is formed with a through hole 33c penetrating in the left-right direction. The right end of the through hole 33c has a tapered surface 33d with which the head of the bolt 39 abuts, the inner diameter of which increases toward the right side.

Resin interposed

members

34, 35 are disposed adjacent to the fulcrum wire guide 31 on both sides in the axial direction of the fulcrum wire guide 31. The

intermediate members

34 and 35 are ring members having an L-shaped cross section, and include thrust

bearing portions

34a and 35a extending in the radial direction of the fulcrum guide 31 and

radial bearing portions

34b and 35b extending in the axial direction of the fulcrum guide 31. By providing such resin-made

interposed members

34, 35, wear of the fulcrum guide 31 and the shaft member 33 can be suppressed. For the interposed

members

34 and 35, POM (polyacetal) is used, for example.

The thrust bearing portion 34a of the right intermediate member 34 is disposed between the fulcrum guide 31 and the flange portion 33b of the shaft member 33 in the axial direction of the fulcrum guide 31, and abuts against the right end surface of the fulcrum guide 31. The thrust bearing portion 35a of the left intermediate member 35 is disposed between the fulcrum wire guide 31 and the spring 36 in the axial direction of the fulcrum wire guide 31, and is in contact with the left end surface of the fulcrum wire guide 31. The

radial bearing portions

34b and 35b are disposed between the fulcrum wire guide 31 and the shaft portion 33a of the shaft member 33 in the radial direction of the fulcrum wire guide 31, and abut against the inner peripheral surface of the fulcrum wire guide 31.

When the bolt 39 is inserted into the through hole 33c in a state where the fulcrum guide 31 is fitted to the outside of the shaft member 33 and the bolt 39 is fastened to the female screw portion 32d of the fixing member 32, the shaft member 33 is fixed to the fixing member 32. At this time, the fulcrum guide 31 is pressed toward the flange portion 33b by the biasing force of the spring 36 disposed in the recess portion 32c of the fixing member 32.

Conventionally, the wire is continuously in contact with the same portion of the outer peripheral surface of the fulcrum guide, and in order to avoid local wear of the fulcrum guide, the fulcrum guide that can be freely rotated, that is, can be rotated at a peripheral speed substantially equal to the running speed of the wire, is often used. However, when a freely rotatable fulcrum guide is used, a precise bearing structure such as a ball bearing is required, and the rotation speed of the fulcrum guide may decrease during winding of the yarn due to deterioration of the bearing structure. As a result, the quality of the yarn may be changed unexpectedly.

In order to avoid such a change in the quality of the yarn, in the present embodiment, a rotation resistance applying mechanism 37 that applies rotation resistance to the fulcrum guide 31 is provided so that the circumferential speed of the fulcrum guide 31 is slower than the advancing speed of the yarn Y. The rotation resistance applying mechanism 37 is adjusted so that the fulcrum wire guide 31 is rotated at a peripheral speed slower than the advancing speed of the yarn Y when the fulcrum wire guide 31 receives a torque of a predetermined value or more from the yarn Y. Specifically, the rotation resistance applying mechanism 37 is constituted by the spring 36 and the flange portion 33b of the shaft member 33. The spring 36 presses the fulcrum guide 31 against the flange portion 33b, so that frictional resistance when the fulcrum guide 31 rotates increases, and rotational resistance can be applied. As a result, the rotation speed of the fulcrum guide 31 can be reduced.

By changing the interposed

members

34 and 35 or the spring 36, the magnitude of the rotation resistance applied to the fulcrum guide 31 can be adjusted. Alternatively, a washer may be provided at an appropriate position between the recess 32c of the fixing member 32 and the flange 33b of the shaft member 33 to adjust the biasing force of the spring 36. The circumferential speed of the fulcrum guide 31 is preferably adjusted to 5% or less, more preferably 3.5% or less of the running speed of the yarn Y by the rotation resistance applying mechanism 37. Alternatively, the rotational speed of the fulcrum guide 31 is preferably adjusted to 7400rpm or less, more preferably 5000rpm or less by the rotational resistance applying mechanism 37.

By slowly rotating the fulcrum wire guide 31 at a low speed, the frictional characteristics between the fulcrum wire guide 31 and the yarn Y are substantially constant and almost constant, compared with the case where the fulcrum wire guide 31 is fixed. Therefore, even if the rotation speed of the fulcrum guide 31 slightly fluctuates during winding of the yarn Y, a large change in the quality of the yarn can be avoided. Further, when the rotation speed of the fulcrum guide 31 is small, a precise bearing structure such as a ball bearing is not necessary, and a simple bearing structure such as a slide bearing can be used, so that there is a secondary effect that the cost can be further reduced.

In the guide wire bodies 16 (the guide wire bodies near the end of the plurality of guide wire bodies 16, see fig. 2) having a large contact angle (winding angle) with the yarn Y, the frictional force between the yarn Y and the fulcrum guide 31 is large. Therefore, the torque acting on the fulcrum guide 31 from the beginning exceeds the predetermined value, and the fulcrum guide 31 is often driven and rotated at a peripheral speed slower than the advancing speed of the yarn Y at all times. However, in the guide wire bodies 16 (the guide wire bodies closer to the center among the plurality of guide wire bodies 16, see fig. 2) in which the contact angle (the winding angle) with the yarn Y is small, the frictional force between the yarn Y and the fulcrum guide 31 is small. Therefore, the torque acting on the fulcrum guide 31 may not exceed the predetermined value. However, this is not particularly problematic.

If the torque applied to the fulcrum guide 31 due to the frictional force with the yarn Y does not reach the predetermined value, that is, if the fulcrum guide 31 is not driven to rotate due to the travel of the yarn Y, the yarn Y continues to contact the same portion of the outer peripheral surface of the fulcrum guide 31, and local abrasion occurs. When the fulcrum wire guide 31 is worn, the frictional force with the yarn Y increases, the torque acting on the fulcrum wire guide 31 reaches the predetermined value, and the fulcrum wire guide 31 is slightly rotated. Then, when the wire Y comes into contact with a portion of the fulcrum wire guide 31 where abrasion is not generated, the fulcrum wire guide 31 becomes non-rotatable again. Even with such behavior of the fulcrum guide 31, it is possible to suppress a change in the quality of the yarn due to the yarn Y continuously coming into contact with the worn portion of the fulcrum guide 31.

(verification experiment of physical Properties of Silk yarn)

An experiment was performed to verify whether or not a change in yarn quality was actually suppressed using the yarn guide 16 of the present embodiment. Specifically, the following was verified: when the fulcrum guide 31 is rotated by the movement of the yarn Y in a state where the rotational resistance is applied by the rotational resistance applying mechanism 37, the fluctuation of each physical parameter such as the tension, strength, and elongation of the yarn Y is not increased as compared with the case where the fulcrum guide 31 is fixed. The thickness of the yarn Y used in the experiment was 83dtex, and the outer diameter of the fulcrum guide 31 was 10 mm. When the advancing speed of the yarn Y was 4600m/min, the rotation speed of the fulcrum yarn guide 31 was 120rpm, and the peripheral speed was 3.8m/min (0.08% of the advancing speed of the yarn Y).

Fig. 4 is a graph showing the results of a verification experiment for the physical properties of the yarn. The numbers shown in the respective histograms represent the average values, and the deviations are also shown together with the histograms with respect to the strength and the elongation. "no rotation" indicates that the fulcrum wire guide 31 is fixed, and "rotation" indicates that the fulcrum wire guide 31 is rotated in a driven manner in a state where rotation resistance is applied by the rotation resistance applying mechanism 37. In any of the physical properties of the yarn, there is almost no difference from the case of fixing the fulcrum guide 31, and variation in yarn quality is suppressed. From the experimental results, it can be said that the following is confirmed: by applying a rotational resistance to the fulcrum guide 31 and rotating it at a low speed, it is possible to suppress the quality of the yarn from changing during winding of the yarn. The scope of application of the present invention is not limited to the range in which the effects thereof are verified in the verification experiment. For example, if the peripheral speed of the fulcrum guide 31 is about 5% or less of the running speed of the yarn Y, the change in the quality of the yarn during winding can be sufficiently suppressed. In the conditions of the present verification experiment, when the peripheral speed of the fulcrum guide 31 was 5% of the advancing speed of the yarn Y, the rotation speed of the fulcrum guide 31 was about 7400 rpm.

(Effect)

In the present embodiment, since the fulcrum guide 31 is rotated in a driven manner when receiving a torque of a predetermined value or more from the yarn Y, a portion of the outer peripheral surface of the fulcrum guide 31 that contacts the yarn Y can be changed, and local wear of the fulcrum guide 31 can be suppressed. Further, since a driving unit such as a motor for rotating the fulcrum guide 31 is not required, the cost can be reduced. Further, by rotating the fulcrum guide 31 at a peripheral speed slower than the running speed of the yarn Y by the rotation resistance applying mechanism 37, the frictional characteristics between the fulcrum guide 31 and the yarn Y are substantially constant without substantially changing as compared with the case where the fulcrum guide 31 is fixed. Therefore, even if the rotation speed of the fulcrum guide 31 slightly fluctuates, the change in the quality of the yarn caused by the fluctuation can be suppressed. Therefore, the variation in the quality of the yarn can be suppressed at low cost.

In the present embodiment, the rotational resistance applying mechanism 37 applies rotational resistance to the fulcrum guide 31 such that the circumferential speed of the fulcrum guide 31 is preferably 5% or less, more preferably 3.5% or less of the advancing speed of the yarn Y. If the peripheral speed of the fulcrum guide 31 is sufficiently low to be 5% or less of the advancing speed of the yarn Y, the change in the quality of the yarn can be more effectively suppressed.

In the present embodiment, the rotation resistance applying mechanism 37 applies rotation resistance to the fulcrum wire guide 31 so that the rotation speed of the fulcrum wire guide 31 is preferably 7400rpm or less. When the rotation speed of the fulcrum guide 31 is high, the fulcrum guide 31 and other components in contact with the fulcrum guide 31 are easily worn, and there is a possibility that smooth rotation of the fulcrum guide 31 is hindered. Therefore, as described above, by reducing the rotation speed of the fulcrum guide 31 to 7400rpm or less, it is possible to suppress the wear of the fulcrum guide 31 and other components in contact with the fulcrum guide 31, and to continue smooth rotation of the fulcrum guide 31.

In the present embodiment, the rotation resistance applying mechanism 37 includes a flange portion 33b (pressed portion) disposed on one side in the axial direction of the fulcrum guide 31, and a spring 36 (pressing member) that presses the fulcrum guide 31 toward the flange portion 33 b. With this configuration, the pressing force generated by the spring 36 can apply rotational resistance to the fulcrum guide 31.

In the present embodiment, the interposed

members

34 and 35 are disposed between the fulcrum guide 31 and the flange portion 33b and between the fulcrum guide 31 and the spring 36. With this configuration, the pressing force acting on the fulcrum guide 31 can be adjusted by the shape, size, material, and the like of the interposed

members

34 and 35, and the rotational speed and circumferential speed of the fulcrum guide 31 can be easily adjusted.

In the present embodiment, the interposed

members

34 and 35 have thrust

bearing portions

34a and 35a that contact the end surface of the fulcrum guide 31, and

radial bearing portions

34b and 35b that contact the inner circumferential surface of the fulcrum guide 31. By providing the

thrust bearing portions

34a and 35a and the

radial bearing portions

34b and 35b in the interposed

members

34 and 35, the fulcrum guide 31 can be rotated more smoothly.

In the present embodiment, the pressing member is a spring 36. By using the spring 36 as the pressing member, the pressing force acting on the fulcrum wire guide 31 can be easily adjusted, and the rotational speed and the circumferential speed of the fulcrum wire guide 31 can be easily adjusted.

In the present embodiment, a flange portion 33b is integrally formed on a member 33 that rotatably supports the fulcrum guide 31. With such a configuration, the wire guide 16 can be manufactured with a small number of components.

(other embodiments)

A modification example in which various modifications are applied to the above embodiment will be described.

In the above embodiment, the shaft portion 33a and the flange portion 33b corresponding to the pressed portion of the present invention are integrally formed on the shaft member 33 of the present invention. However, the pressed portion of the present invention may be configured as a member different from the shaft portion 33 a. The shaft 33a may be integrally formed with the fixing member 32. In this case, the fixing member 32 corresponds to the shaft member of the present invention.

In the above embodiment, the spring 36 constitutes the pressing member of the present invention. However, the pressing member may be formed of an elastic body such as an O-ring.

In the above embodiment, the spring 36 is disposed in the recess of the fixing member 32. However, the arrangement of the spring 36 is not limited to this. For example, the spring 36 may be disposed between the fulcrum guide 31 and the flange portion 33 b. In this case, the fixing member 32 functions as the pressed portion of the present invention.

In the above embodiment, the interposed

members

34, 35 are provided. However, the intervening

members

34 and 35 may be omitted, and only one of the intervening

members

34 and 35 may be provided. The specific shape and material of the interposed

members

34 and 35 are not limited to those of the above embodiments.

In the above embodiment, the plurality of thread guides 16 are movable between the winding position and the threading position. However, the plurality of guide wires 16 need not be configured to be movable.

In the above embodiment, the rotational resistance applying mechanism 37 is constituted by the spring 36 and the flange portion 33 b. However, the specific configuration of the rotation resistance applying mechanism is not limited thereto. Fig. 5 is a cross-sectional view of a modified example of the wire guide 16. In this modification, the rotation resistance applying mechanism is constituted by the

contact portions

41 and 42 between the fulcrum guide 31 and the intervening

members

34 and 35 that are in contact with the fulcrum guide 31. The following description is made in detail.

The

contact portions

41 and 42 are formed between the inner peripheral surface of the fulcrum guide 31 and the

radial bearing portions

34b and 35b of the interposed

members

34 and 35. The frictional force at the

contact portions

41 and 42 is adjusted so that the peripheral speed of the fulcrum guide 31 is slower than the advancing speed of the yarn Y when the fulcrum guide 31 is driven and rotated by the advancing of the yarn Y. Both end surfaces of the fulcrum guide 31 loosely contact the

thrust bearing portions

34a and 35a of the interposed

members

34 and 35 to such an extent that almost no frictional resistance is generated. However, instead of the

contact portions

41 and 42 between the inner peripheral surface of the fulcrum guide 31 and the

radial bearing portions

34b and 35b, or in addition thereto, the contact portions formed between the end surface of the fulcrum guide 31 and the

thrust bearing portions

34a and 35a may function as the rotational resistance applying mechanism. The intervening

members

34 and 35 may be omitted, and the contact portion between the fulcrum guide 31 and the shaft member 33 may function as a rotation resistance applying mechanism.

An experiment was performed to verify whether or not the change in the yarn quality was actually suppressed by using the yarn guide 16 of the present modification. Specifically, the following was verified: when the fulcrum guide 31 is driven and rotated by the movement of the yarn Y in a state where the rotation resistance is applied by the

contact portions

41 and 42, the fluctuation of each physical parameter such as the tension, strength, and elongation of the yarn Y is not increased as compared with the case where the fulcrum guide 31 is fixed. The thickness of the yarn Y used in the experiment was 33dtex, and the outer diameter of the fulcrum thread guide 31 was 10 mm. When the advancing speed of the yarn Y is 4500m/min, the rotation speed of the fulcrum yarn guide 31 is 3000-5000 rpm, and the peripheral speed is 94-157 m/min (2.1-3.5% of the advancing speed of the yarn Y).

Fig. 6 is a graph showing the results of a verification experiment for the physical properties of the yarn. The numbers shown in the respective histograms represent the average values, and the deviations are also shown together with the histograms. "no rotation" indicates a case where the fulcrum guide 31 is fixed, and "rotation" indicates a case where the fulcrum guide 31 is rotated in a driven manner in a state where rotation resistance is applied by the rotation resistance applying mechanism 37. As described above, although the rotation speed and the peripheral speed of the fulcrum guide 31 slightly vary, there is almost no difference in any physical properties of the yarn compared to the case where the fulcrum guide 31 is fixed, and variation in quality of the yarn is suppressed. From the experimental results, it can be said that the following is confirmed: by applying a rotational resistance to the fulcrum guide 31 and rotating it at a low speed, it is possible to suppress the quality of the yarn from changing during winding of the yarn. In the conditions of the present verification experiment, when the peripheral speed of the fulcrum guide 31 was 5% of the advancing speed of the yarn Y, the rotation speed of the fulcrum guide 31 was about 7200 rpm.

In the present modification, the spring 36 of the above embodiment is not required, and the wire guide 16 can be manufactured with a small number of components.

In the present modification, the

contact portions

41 and 42 as the rotation resistance applying means are formed between the inner peripheral surface of the fulcrum guide 31 and the other members (the intervening members 34 and 35) that are in contact with the inner peripheral surface of the fulcrum guide 31. In general, since the area of the inner peripheral surface of the fulcrum wire guide 31 is larger than the area of the end surface, the adjustment of the frictional force is facilitated by using the inner peripheral surface of the fulcrum wire guide 31 as the rotation resistance applying mechanism.

In the present modification, the intervening

members

34, 35 are disposed between the fulcrum guide 31 and the shaft member 33 that rotatably supports the fulcrum guide 31, and the

contact portions

41, 42 as the rotation resistance imparting means are formed between the inner peripheral surface of the fulcrum guide 31 and the intervening

members

34, 35. With this configuration, the frictional force at the

contact portions

41 and 42 can be adjusted by the shape, size, material, and the like of the interposed

members

Claims

1. A yarn guide having a fulcrum yarn guide serving as a fulcrum when a yarn is wound around a bobbin while being traversed, characterized in that,

the fulcrum guide has a cylindrical shape and is rotatable around a central axis,

the yarn guide body is provided with a rotational resistance applying mechanism that applies rotational resistance to the fulcrum yarn guide so that the fulcrum yarn guide is rotated at a peripheral speed slower than a traveling speed of the yarn when the fulcrum yarn guide receives a torque of a predetermined value or more from the yarn traveling while being in contact with an outer peripheral surface of the fulcrum yarn guide.

2. The guidewire body of claim 1,

the rotational resistance applying means applies rotational resistance to the fulcrum yarn guide such that the circumferential speed of the fulcrum yarn guide is 5% or less of the advancing speed of the yarn.

3. The guidewire body of claim 2,

the rotational resistance applying means applies rotational resistance to the fulcrum yarn guide such that the circumferential speed of the fulcrum yarn guide is 3.5% or less of the advancing speed of the yarn.

4. The guidewire body according to any one of claims 1 to 3,

the rotation resistance applying mechanism applies rotation resistance to the fulcrum thread guide so that the rotation speed of the fulcrum thread guide is 7400rpm or less.

5. The guidewire body of claim 4,

the rotation resistance applying mechanism applies rotation resistance to the fulcrum guide so that the rotation speed of the fulcrum guide is 5000rpm or less.

6. The guidewire body according to any one of claims 1 to 5,

the rotation resistance applying mechanism includes:

a pressed portion disposed on one axial side of the fulcrum guide; and

and a pressing member that presses the fulcrum guide toward the pressed portion.

7. The guidewire body of claim 6,

an interposed member is disposed between the fulcrum guide and the pressed portion and/or between the fulcrum guide and the pressing member.

8. The guidewire body of claim 7,

the interposed member includes:

a thrust bearing part which is abutted with the end surface of the fulcrum thread guide; and

and a radial bearing portion which abuts against an inner peripheral surface of the fulcrum guide.

9. The guidewire body according to any one of claims 6 to 8,

the pressing member is a spring.

10. The guidewire body according to any one of claims 6 to 9,

the pressed portion is integrally formed with a member that rotatably supports the fulcrum guide.

11. The guidewire body according to any one of claims 1 to 5,

the rotation resistance applying mechanism is a contact portion formed between the fulcrum guide and another member that is in contact with the fulcrum guide,

in the contact portion, the frictional force is adjusted so that the peripheral speed of the fulcrum yarn guide is slower than the advancing speed of the yarn.

12. The guidewire body of claim 11,

the contact portion serving as the rotation resistance applying mechanism is formed between an inner peripheral surface of the fulcrum guide and another member in contact with the inner peripheral surface of the fulcrum guide.

13. The guidewire body of claim 12,

an intervening member is disposed between a shaft member that rotatably supports the fulcrum guide and the fulcrum guide,

the contact portion as the rotation resistance applying means is formed between the inner peripheral surface of the fulcrum guide and the interposed member.

14. A yarn winding machine for winding a plurality of yarns on a plurality of bobbins mounted on a winding shaft,

the guidewire body according to any one of claims 1 to 13, wherein a plurality of the guidewire bodies are arranged in an axial direction of the winding shaft.