Guide body and yarn winding machine

Abstract

To provide a guide body capable of suppressing change in yarn quality at low cost.SOLUTION: A guide body 16 comprises a support point guide 31 that becomes a support point when winding yarn around a bobbin while traversing the yarn. The support point guide 31 has a cylindrical shape and is rotatable around a central axis. The guide body 16 is provided with rotational resistance application means 37 for applying a rotational resistance to the support point guide 31 so that when the support point guide 31 receives a predetermined value or more of torque from the yarn traveling while coming into contact with an outer peripheral surface of the support point guide 31, the support point guide 31 is driven to rotate at a peripheral speed slower than a travelling speed of the yarn.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a guide body having a fulcrum guide that serves as a fulcrum when a yarn is wound onto a bobbin while being traversed, and to a yarn winding machine including the guide body. [Background technology]

[0002] Conventionally, there has been known a yarn winding machine that winds a yarn spun from a spinning device onto a bobbin while traversing the yarn. Such a yarn winding machine is provided with a fulcrum guide that serves 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 the yarn is hung on the outer peripheral surface of the fulcrum guide.

[0003] In Patent Document 1, the fulcrum guide is configured so that it does not rotate around its central axis during yarn winding. Therefore, the yarn traveling at high speed continues to contact the same portion of the outer peripheral surface of the fulcrum guide, which tends to cause localized wear on the fulcrum guide. As a result, the contact state between the yarn and the fulcrum guide changes, which could lead to a deterioration in yarn quality. Therefore, in Patent Document 1, the fulcrum guide is configured to be rotated by a motor, which allows the contact position with the yarn to be changed. However, Patent Document 1 requires a drive unit such as a motor to rotate the fulcrum guide, which results in a problem of high costs.

[0004] On the other hand, in Patent Document 2, the fulcrum guide is a roller that can freely rotate around a central axis. Therefore, the fulcrum guide constantly rotates due to friction with the yarn during yarn winding, which reduces localized wear. Furthermore, using a freely rotatable roller eliminates the need for a drive unit to rotate the fulcrum guide, thereby reducing costs. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-23787 [Patent Document 2] Special Publication No. 2008-531438 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in Patent Document 2, a precise bearing structure is required so that the fulcrum guide can withstand high-speed rotation. A precise bearing structure is prone to deterioration, and as a result, the rotation speed of the fulcrum guide decreases during yarn winding, which may unintentionally change the yarn quality.

[0007] In view of the above problems, an object of the present invention is to provide a guide body that can suppress changes in yarn quality at low cost. [Means for solving the problem]

[0008] The present invention is a guide body having a fulcrum guide that serves as a fulcrum when a yarn is wound onto a bobbin while being traversed, wherein the fulcrum guide has a cylindrical shape and is rotatable around a central axis, and is provided with a rotational resistance imparting means that imparts rotational resistance to the fulcrum guide so that, when the fulcrum guide receives a torque of a predetermined value or more from the yarn that is running while in contact with the outer peripheral surface of the fulcrum guide, the fulcrum guide is driven to rotate at a peripheral speed slower than the running speed of the yarn.

[0009] According to the present invention, the fulcrum guide rotates when it receives torque from the yarn that is equal to or greater than a predetermined value. This allows the portion of the fulcrum guide's outer peripheral surface that the yarn contacts to be varied, thereby reducing localized wear of the fulcrum guide. Furthermore, since a drive unit such as a motor for rotating the fulcrum guide is not required, costs can be reduced. Furthermore, by using a rotational resistance imparting means to rotate the fulcrum guide at a peripheral speed slower than the running speed of the yarn, the friction characteristics between the fulcrum guide and the yarn remain substantially constant, almost unchanged from when the fulcrum guide is fixed. Therefore, even if the rotation speed of the fulcrum guide fluctuates slightly, changes in yarn quality due to this can be reduced. As described above, according to the present invention, changes in yarn quality can be reduced at low cost.

[0010] In the present invention, the rotational resistance applying means preferably applies rotational resistance to the fulcrum guide so that the peripheral speed of the fulcrum guide is preferably 5% or less, more preferably 3.5% or less of the running speed of the yarn.

[0011] If the peripheral speed of the fulcrum guide is sufficiently slow, ie, 5% or less of the running speed of the yarn, changes in yarn quality can be more effectively suppressed.

[0012] In the present invention, the rotational resistance applying means preferably applies rotational resistance to the fulcrum guide so that the rotational speed of the fulcrum guide is preferably 7400 rpm or less, and more preferably 5000 rpm or less.

[0013] If the rotation speed of the fulcrum guide is high, the fulcrum guide and other components in contact with it are likely to wear out, which could hinder the smooth rotation of the fulcrum guide. Therefore, as described above, by lowering the rotation speed of the fulcrum guide to 7,400 rpm or less, it is possible to reduce wear on the fulcrum guide and other components in contact with it, and to maintain the smooth rotation of the fulcrum guide.

[0014] In the present invention, the rotational resistance applying means may include a pressed portion disposed on one axial side of the fulcrum guide, and a pressing member that presses the fulcrum guide against the pressed portion.

[0015] According to this configuration, the pressing force of the pressing member can impart rotational resistance to the fulcrum guide.

[0016] 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.

[0017] With this configuration, it is possible to adjust the pressing force acting on the fulcrum guide by changing the shape, dimensions, material, etc. of the intervening member, making it easier to adjust the rotation speed and peripheral speed of the fulcrum guide.

[0018] In the present invention, the intervening member may have a thrust bearing portion that abuts against an end face of the fulcrum guide, and a radial bearing portion that abuts against an inner peripheral surface of the fulcrum guide.

[0019] By providing the intervening member with a thrust bearing portion and a radial bearing portion, the fulcrum guide can be rotated more smoothly.

[0020] In the present invention, the pressing member may be a spring.

[0021] By using a spring as the pressing member, it becomes easier to adjust the pressing force acting on the fulcrum guide, and it becomes easier to adjust the rotation speed and peripheral speed of the fulcrum guide.

[0022] In the present invention, the pressed portion may be formed integrally with a shaft member that rotatably supports the fulcrum guide.

[0023] With this configuration, the guide body can be manufactured using a small number of parts.

[0024] In the present invention, the rotational resistance imparting means is a contact portion formed between the fulcrum guide and another member that contacts the fulcrum guide, and the friction force at the contact portion is adjusted so that the peripheral speed of the fulcrum guide is slower than the running speed of the yarn.

[0025] With this configuration, the above-mentioned pressing member is not necessary, and the guide body can be manufactured with a small number of parts.

[0026] In the present invention, the contact portion serving as the rotational resistance applying means may be formed between the inner peripheral surface of the fulcrum guide and another member that contacts the inner peripheral surface of the fulcrum guide.

[0027] Generally, the inner peripheral surface of the fulcrum guide has a larger area than the end surface, so by using the inner peripheral surface of the fulcrum guide as a rotational resistance imparting means, it becomes easier to adjust the frictional force.

[0028] In the present invention, an intervening member is arranged between the fulcrum guide and an axial member that rotatably supports the fulcrum guide, and the contact portion as the rotational resistance imparting means is preferably formed between the inner surface of the fulcrum guide and the intervening member.

[0029] With this configuration, it is possible to adjust the frictional force at the contact portion by changing the shape, dimensions, material, etc. of the intervening member, and it becomes easier to adjust the rotational speed and peripheral speed of the fulcrum guide.

[0030] The present invention is a yarn winding machine that winds multiple yarns onto multiple bobbins attached to a winding shaft, characterized in that multiple of any of the above guide bodies are lined up in the axial direction of the winding shaft.

[0031] Such a yarn winding machine can suppress changes in yarn quality at low cost. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a side view of a spinning take-up device according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a diagram showing the results of an experiment to verify yarn properties. [Figure 5] FIG. 10 is a cross-sectional view of a guide body according to a modified example. [Figure 6] FIG. 10 is a diagram showing the results of a verification experiment in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, an embodiment in which a yarn winding machine having a guide body according to the present invention is applied to a yarn take-up device will be described with reference to the drawings.

[0034] (Yarn take-up device) 1 is a side view of the yarn take-off device 1 according to this embodiment. In this specification, the front, back, left, right, top, and bottom directions shown in FIG.

[0035] The yarn take-up device 1 is a device that takes up multiple (16 in this embodiment) yarns Y spun from the spinning device 2, and is equipped with godet rollers 3 and 4 and a yarn winding machine 10. The spinning device 2 is disposed above the spinning yarn take-up device 1, and spins multiple yarns Y made of synthetic resin. The godet rollers 3 and 4 are disposed below the spinning device 2, and are driven to rotate by a motor (not shown). The multiple yarns Y spun from the spinning device 2 are sent to the yarn winding machine 10 via the godet rollers 3 and 4.

[0036] The yarn winding machine 10 is disposed below the godet rollers 3 and 4. The yarn winding machine 10 has two bobbin holders 13 (winding shafts of the present invention) supported at one end by a turret 12 built into a machine base 11. The bobbin holders 13 extend in the front-rear direction, and their rear ends are supported by the turrets 12. A plurality of bobbins B can be attached to the bobbin holders 13 in the front-rear direction. The bobbin holders 13 are driven to rotate around their axes by a motor (not shown).

[0037] The turret 12 is a disk-shaped member having a rotation axis parallel to the front-rear direction, and has bobbin holders 13 attached to an upper position and a lower position that are 180 degrees apart in the circumferential direction. By rotating the turret 12, the two bobbin holders 13 move between the upper and lower positions. The bobbin holder 13 in the upper position winds multiple yarns Y onto multiple bobbins B to form multiple packages P. Meanwhile, the bobbin holder 13 in the lower position collects the multiple packages P and loads new multiple bobbins B.

[0038] The yarn winding machine 10 has a support frame 14 that is cantilevered on a machine base 11. The rear end of the support frame 14 is supported by the machine base 11. A guide unit 15 is disposed above the support frame 14. The guide unit 15 has guide bodies 16, the same number as the number of yarns Y, arranged side by side in the front-rear direction. The support frame 14 has traverse devices 17, the same number as the number of yarns Y, arranged side by side in the front-rear direction. The traverse devices 17 traverse the yarns Y in the front-rear direction, using the corresponding guide bodies 16 as fulcrums.

[0039] A contact roller 18 is disposed below the support frame 14 and is rotatably supported by the support frame 14. The contact roller 18 comes into contact with the outer peripheral surfaces of the multiple packages P held by the bobbin holder 13 at the upper position. During yarn winding, the contact roller 18 rotates while applying a predetermined contact pressure to the package P, thereby shaping the package P.

[0040] (Guide unit) The configuration of the guide unit 15 will be described. Fig. 2 is a side view of the guide unit 15. Fig. 2a shows a state in which the multiple guide bodies 16 are positioned at the winding position, and Fig. 2b shows a state in which the multiple guide bodies 16 are positioned at the threading position. The winding position is the position of the multiple guide bodies 16 when multiple yarns Y are wound onto multiple bobbins B. The threading position is the position of the multiple guide bodies 16 when multiple yarns Y are hooked onto the multiple guide bodies 16. The multiple guide bodies 16 are configured to be movable between the winding position and the threading position.

[0041] The guide unit 15 includes a plurality of guide bodies 16, a plurality of sliders 21, a guide rail 22, and an air cylinder 23. The number of sliders 21 provided is the same as the number of guide bodies 16, and each guide body 16 is attached to a 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). The plurality of sliders 21 are slidably attached to the guide rail 22 while being aligned in the front-rear direction. Adjacent sliders 21 are connected to each other by a belt (not shown). The air cylinder 23 is a drive device for moving the plurality of guide bodies 16 between the winding position and the threading position. A rod 23a of the air cylinder 23 is connected to the rearmost slider 21. Note that the drive device for moving the plurality of guide bodies 16 is not limited to the air cylinder 23 and may be another actuator such as a motor.

[0042] As shown in Figure 2a, when the rod 23a of the air cylinder 23 is retracted, the multiple sliders 21 are lined up in the front-to-rear direction while being spaced apart from each other. The position of the multiple guide bodies 16 at this time is the winding position. On the other hand, as shown in Figure 2b, when the rod 23a of the air cylinder 23 is extended, the multiple sliders 21 are gathered at the front end of the guide rail 22. The position of the multiple guide bodies 16 at this time is the threading position.

[0043] 2A, the yarn paths of the multiple yarns Y distributed from the godet roller 4 to the multiple guide bodies 16 located at the winding position are approximately symmetrical in the front-to-rear direction with respect to a vertical plane passing through the centers of the multiple guide bodies 16. The eight yarns Y in the front half are hooked on the front side of the guide bodies 16, while the eight yarns Y in the rear half are hooked on the rear side of the guide bodies 16. Furthermore, the guide bodies 16 closer to the ends have larger contact angles (winding angles) with the yarn Y, and the guide bodies 16 closer to the center have smaller contact angles (winding angles) with the yarn Y.

[0044] (Guide body) The guide body 16 will now be described in detail. FIG. 3 is a cross-sectional view of the guide body 16. The guide body 16 has 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 the shaft member 33 so as to be rotatable about its central axis. The yarn Y is hung on the outer peripheral surface of the fulcrum guide 31, and runs in contact with the outer peripheral surface of the fulcrum guide 31 during yarn winding. When the fulcrum guide 31 receives a torque of a predetermined value or greater from the yarn Y running in contact with the outer peripheral surface of the fulcrum guide 31, the fulcrum guide 31 is driven to rotate at a peripheral speed slower than the running speed of the yarn Y.

[0045] The fixing member 32 has a cylindrical small-diameter portion 32a and a cylindrical large-diameter portion 32b. The small-diameter portion 32a is inserted into a circular mounting hole 21a formed in the slider 21. A circular ring-shaped recess 32c is formed at the right end of the large-diameter portion 32b. A spring 36 (a pressing member of the present invention) is disposed in the recess 32c. The fixing member 32 has a female thread portion 32d that penetrates in the left-right direction. The fixing member 32 is fixed to the slider 21 with a bolt (not shown) with the small-diameter portion 32a inserted from the right side of the mounting hole 21a and with the flange surface of the large-diameter portion 32b abutting against the slider 21.

[0046] The shaft member 33 is a member in which a shaft portion 33a and a flange portion 33b (the 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 fitted onto the shaft portion 33a. The flange portion 33b is an annular portion that extends from the right end of the shaft portion 33a radially outward of the shaft portion 33a. A through hole 33c that penetrates in the left-right direction is formed in the shaft member 33. The right end of the through hole 33c has an inner diameter that increases toward the right, and a tapered surface 33d is formed against which the head of the bolt 39 abuts.

[0047] Resin intervening members 34, 35 are arranged adjacent to the fulcrum guide 31 on both axial sides of the fulcrum guide 31. The intervening members 34, 35 are circular members with an L-shaped cross section, and have thrust bearing portions 34a, 35a extending in the radial direction of the fulcrum guide 31, and radial bearing portions 34b, 35b extending in the axial direction of the fulcrum guide 31. By providing such resin intervening members 34, 35, wear on the fulcrum guide 31 and the shaft member 33 can be reduced. The intervening members 34, 35 are made of, for example, POM (polyacetal).

[0048] The thrust bearing portion 34a of the right-side intervening 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 face of the fulcrum guide 31. The thrust bearing portion 35a of the left-side intervening member 35 is disposed between the fulcrum guide 31 and the spring 36 in the axial direction of the fulcrum guide 31, and abuts against the left end face of the fulcrum guide 31. The radial bearing portions 34b, 35b are disposed between the fulcrum guide 31 and the shaft portion 33a of the shaft member 33 in the radial direction of the fulcrum guide 31, and abut against the inner circumferential surface of the fulcrum guide 31.

[0049] With the fulcrum guide 31 fitted onto the shaft member 33, a bolt 39 is inserted into the through hole 33c and then tightened into the female thread portion 32d of the fixing member 32, thereby fixing the shaft member 33 to the fixing member 32. At this time, the fulcrum guide 31 is pressed against the flange portion 33b by the biasing force of the spring 36 arranged in the recess 32c of the fixing member 32.

[0050] Conventionally, to prevent the yarn from continuously contacting the same portion of the outer peripheral surface of the fulcrum guide, which would cause localized wear of the fulcrum guide, a fulcrum guide that is freely rotatable, i.e., that can rotate at approximately the same peripheral speed as the running speed of the yarn, has been used in many cases. However, when a freely rotatable fulcrum guide is used, a precision bearing structure such as a ball bearing is required, and deterioration of the bearing structure can sometimes cause the rotation speed of the fulcrum guide to decrease during yarn winding. As a result, there is a risk of unintended changes in yarn quality.

[0051] To avoid such changes in yarn quality, this embodiment is provided with a rotational resistance applying means 37 that applies rotational resistance to the fulcrum guide 31 so that the peripheral speed of the fulcrum guide 31 is slower than the running speed of the yarn Y. The rotational resistance applying means 37 is adjusted so that, when the fulcrum guide 31 receives torque from the yarn Y of a predetermined value or greater, the fulcrum guide 31 is driven to rotate at a peripheral speed slower than the running speed of the yarn Y. Specifically, the rotational resistance applying means 37 is composed of a spring 36 and a flange portion 33b of the shaft member 33. The spring 36 presses the fulcrum guide 31 toward the flange portion 33b, thereby increasing frictional resistance when the fulcrum guide 31 rotates, and thereby applying rotational resistance. As a result, the number of rotations of the fulcrum guide 31 can be reduced.

[0052] The magnitude of the rotational resistance applied to the fulcrum guide 31 can be adjusted by changing the intervening members 34, 35 or the spring 36. Alternatively, the biasing force of the spring 36 may be adjusted by providing a spacer at an appropriate position between the recess 32c of the fixed member 32 and the flange portion 33b of the shaft member 33. The rotational resistance applying means 37 adjusts the peripheral speed of the fulcrum guide 31 to preferably 5% or less, more preferably 3.5% or less of the running speed of the yarn Y. Alternatively, the rotational resistance applying means 37 adjusts the rotation speed of the fulcrum guide 31 to preferably 7400 rpm or less, more preferably 5000 rpm or less.

[0053] By slowly rotating the fulcrum guide 31 at a low speed, the friction characteristics between the fulcrum guide 31 and the yarn Y remain substantially constant, almost unchanged from when the fulcrum guide 31 is fixed. Therefore, even if the rotation speed of the fulcrum guide 31 fluctuates slightly during winding of the yarn Y, it is possible to prevent a large change in yarn quality. Furthermore, a low rotation speed of the fulcrum guide 31 eliminates the need for a precision bearing structure such as a ball bearing, and instead allows for a simple bearing structure such as a plain bearing to suffice, which has the secondary effect of further reducing costs.

[0054] In addition, in guide bodies 16 (those near the ends of the multiple guide bodies 16, see Figure 2) that have a large contact angle (wrapping angle) with the yarn Y, the frictional force between the yarn Y and the fulcrum guide 31 is large. For this reason, the torque acting on the fulcrum guide 31 exceeds the predetermined value from the beginning, and the fulcrum guide 31 is often always rotated at a peripheral speed slower than the running speed of the yarn Y. However, in guide bodies 16 (those near the center of the multiple guide bodies 16, see Figure 2) that have a small contact angle (wrapping angle) with the yarn Y, the frictional force between the yarn Y and the fulcrum guide 31 is small. For this reason, the torque acting on the fulcrum guide 31 may not exceed the predetermined value. However, this does not pose a particular problem.

[0055] If the torque acting on the fulcrum guide 31 due to the frictional force with the yarn Y does not reach the predetermined value, i.e., if the fulcrum guide 31 is not rotated by the running yarn Y, the yarn Y continues to contact the same portion of the outer circumferential surface of the fulcrum guide 31, causing localized wear. When wear occurs on the fulcrum guide 31, the frictional force with the yarn Y increases, the torque acting on the fulcrum guide 31 reaches the predetermined value, and the fulcrum guide 31 rotates slightly. Then, when the yarn Y comes into contact with an unworn portion of the fulcrum guide 31, the fulcrum guide 31 stops rotating again. Even with this behavior of the fulcrum guide 31, changes in yarn quality caused by the yarn Y continuing to contact the worn portion of the fulcrum guide 31 are suppressed.

[0056] (Verification experiment of yarn properties) An experiment was conducted to verify whether changes in yarn quality can actually be suppressed using the guide body 16 of this embodiment. Specifically, it was verified whether fluctuations in the physical properties of the yarn Y, such as tension, strength, and elongation, would increase compared to when the fulcrum guide 31 was fixed, when the fulcrum guide 31 was driven to rotate by the running yarn Y while rotational resistance was applied by the rotational resistance applying means 37. The thickness of the yarn Y used in the experiment was 83 dtex, and the outer diameter of the fulcrum guide 31 was 10 mm. When the running speed of the yarn Y was 4600 m / min, the rotation speed of the fulcrum guide 31 was 120 rpm, and the peripheral speed was 3.8 m / min (0.08% of the running speed of the yarn Y).

[0057] Figure 4 shows the results of a verification experiment on yarn properties. The numbers in each bar graph indicate average values, and the variations in strength and elongation are also shown along with the bar graphs. "Without rotation" indicates the case where the fulcrum guide 31 was fixed, and "with rotation" indicates the case where the fulcrum guide 31 was rotated while rotational resistance was applied by the rotational resistance applying means 37. All yarn properties were almost the same as when the fulcrum guide 31 was fixed, and variations in yarn quality were also suppressed. These experimental results demonstrate that applying rotational resistance to the fulcrum guide 31 and rotating it at a low speed can suppress changes in yarn quality during yarn winding. Note that the scope of application of the present invention is not limited to the range in which its effects were verified in this verification experiment. For example, if the peripheral speed of the fulcrum guide 31 is approximately 5% or less of the running speed of the yarn Y, changes in yarn quality during yarn winding can be sufficiently suppressed. Under the conditions of this verification experiment, when the peripheral speed of the fulcrum guide 31 is 5% of the running speed of the yarn Y, the rotation speed of the fulcrum guide 31 is approximately 7400 rpm.

[0058] (effect) In this embodiment, the fulcrum guide 31 is driven to rotate when it receives torque equal to or greater than a predetermined value from the yarn Y. This allows the portion of the outer circumferential surface of the fulcrum guide 31 that the yarn Y comes into contact with to be varied, thereby reducing localized wear of the fulcrum guide 31. Furthermore, since a drive unit such as a motor for rotating the fulcrum guide 31 is not required, costs can be reduced. Furthermore, by using the rotational resistance imparting means 37 to rotate the fulcrum guide 31 at a peripheral speed slower than the running speed of the yarn Y, the friction characteristics between the fulcrum guide 31 and the yarn Y remain substantially constant, almost unchanged from when the fulcrum guide 31 is fixed. Therefore, even if the rotation speed of the fulcrum guide 31 fluctuates slightly, changes in yarn quality due to this can be reduced. This makes it possible to reduce changes in yarn quality at low cost.

[0059] In this embodiment, the rotational resistance applying means 37 applies rotational resistance to the fulcrum guide 31 so that the peripheral speed of the fulcrum guide 31 is preferably 5% or less, and more preferably 3.5% or less, of the running speed of the yarn Y. If the peripheral speed of the fulcrum guide 31 is sufficiently slow, such as 5% or less of the running speed of the yarn Y, changes in yarn quality can be more effectively suppressed.

[0060] In this embodiment, the rotational resistance applying means 37 applies rotational resistance to the fulcrum guide 31 so that the rotation speed of the fulcrum guide 31 is preferably 7400 rpm or less. If the rotation speed of the fulcrum guide 31 is high, the fulcrum guide 31 and other members in contact with the fulcrum guide 31 are likely to wear out, which may hinder the smooth rotation of the fulcrum guide 31. Therefore, as described above, by setting the rotation speed of the fulcrum guide 31 to 7400 rpm or less, it is possible to suppress wear on the fulcrum guide 31 and other members in contact with the fulcrum guide 31, and to maintain the smooth rotation of the fulcrum guide 31.

[0061] In this embodiment, the rotational resistance applying means 37 has a flange portion 33b (pressed portion) arranged on one axial side of the fulcrum guide 31, and a spring 36 (pressing member) that presses the fulcrum guide 31 against the flange portion 33b. With this configuration, the pressing force of the spring 36 can apply rotational resistance to the fulcrum guide 31.

[0062] In this embodiment, intervening members 34, 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, it is possible to adjust the pressing force acting on the fulcrum guide 31 by changing the shape, dimensions, material, etc. of the intervening members 34, 35, making it easier to adjust the rotation speed and peripheral speed of the fulcrum guide 31.

[0063] In this embodiment, the intervening members 34, 35 have thrust bearing portions 34a, 35a that abut against the end faces of the fulcrum guide 31, and radial bearing portions 34b, 35b that abut against the inner peripheral surface of the fulcrum guide 31. Providing the intervening members 34, 35 with the thrust bearing portions 34a, 35a and the radial bearing portions 34b, 35b allows the fulcrum guide 31 to rotate more smoothly.

[0064] In this embodiment, the pressing member is a spring 36. By using the spring 36 as the pressing member, it becomes easier to adjust the pressing force acting on the fulcrum guide 31, and the rotation speed and peripheral speed of the fulcrum guide 31 can be easily adjusted.

[0065] In this embodiment, the flange portion 33b is formed integrally with the shaft member 33 that rotatably supports the fulcrum guide 31. With this configuration, the guide body 16 can be manufactured using a small number of parts.

[0066] (Other embodiments) A description will be given of modifications of the above embodiment, in which various changes have been made.

[0067] In the above embodiment, the shaft portion 33a and the flange portion 33b, which correspond 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 separate from the shaft portion 33a. Also, the shaft portion 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.

[0068] In the above embodiment, the pressing member of the present invention is configured by the spring 36. However, it is also possible to configure the pressing member by an elastic body such as an O-ring.

[0069] In the above embodiment, the spring 36 is disposed in the recess of the fixed 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 33b. In this case, the fixed member 32 functions as the pressed portion of the present invention.

[0070] In the above embodiment, the intervening members 34 and 35 are provided. However, it is possible to omit the intervening members 34 and 35, or to provide only one of the intervening members 34 and 35. Furthermore, the specific shapes and materials of the intervening members 34 and 35 are not limited to those in the above embodiment.

[0071] In the above embodiment, the plurality of guide bodies 16 are movable between the winding position and the threading position. However, it is not essential that the plurality of guide bodies 16 be configured to be movable.

[0072] In the above embodiment, the rotational resistance imparting means 37 is configured by the spring 36 and the flange portion 33b. However, the specific configuration of the rotational resistance imparting means is not limited to this. Figure 5 is a cross-sectional view of a guide body 16 according to a modified example. In this modified example, the rotational resistance imparting means is configured by contact portions 41, 42 between the fulcrum guide 31 and the interposition members 34, 35 that contact the fulcrum guide 31. This will be explained in detail below.

[0073] The contact portions 41, 42 are formed between the inner circumferential surface of the fulcrum guide 31 and the radial bearing portions 34b, 35b of the intervening members 34, 35. The frictional force at the contact portions 41, 42 is adjusted so that when the fulcrum guide 31 is rotated by the running yarn Y, the peripheral speed of the fulcrum guide 31 is slower than the running speed of the yarn Y. The contact between both end faces of the fulcrum guide 31 and the thrust bearing portions 34a, 35a of the intervening members 34, 35 is loose enough to generate almost no frictional resistance. However, instead of or in addition to the contact portions 41, 42 between the inner circumferential surface of the fulcrum guide 31 and the radial bearing portions 34b, 35b, the contact portions formed between the end faces of the fulcrum guide 31 and the thrust bearing portions 34a, 35a may function as rotation resistance imparting means. Furthermore, 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 the rotation resistance applying means.

[0074] An experiment was conducted using the guide body 16 of this modified example to verify whether changes in yarn quality can actually be suppressed. Specifically, it was verified whether fluctuations in the physical properties of the yarn Y, such as tension, strength, and elongation, would increase compared to when the fulcrum guide 31 was fixed, when the fulcrum guide 31 was driven to rotate by the running yarn Y while rotational resistance was applied by the contact portions 41 and 42. The thickness of the yarn Y used in the experiment was 33 dtex, and the outer diameter of the fulcrum guide 31 was 10 mm. When the running speed of the yarn Y was set to 4500 m / min, the rotation speed of the fulcrum guide 31 was 3000 to 5000 rpm, and the peripheral speed was 94 to 157 m / min (2.1 to 3.5% of the running speed of the yarn Y).

[0075] Figure 6 shows the results of a verification experiment on yarn properties. The numbers in each bar graph indicate average values, and the variations are also shown along with the bar graph. "Without rotation" indicates the case where the fulcrum guide 31 was fixed, and "with rotation" indicates the case where the fulcrum guide 31 was rotated while rotational resistance was applied by the rotational resistance applying means 37. As mentioned above, although there were some fluctuations in the rotation speed and peripheral speed of the fulcrum guide 31, all of the yarn properties were almost the same as when the fulcrum guide 31 was fixed, and variations in yarn quality were also suppressed. This experimental result demonstrates that applying rotational resistance to the fulcrum guide 31 and rotating it at a low speed can suppress changes in yarn quality during yarn winding. Note that under the conditions of this verification experiment, when the peripheral speed of the fulcrum guide 31 was 5% of the running speed of the yarn Y, the rotation speed of the fulcrum guide 31 was approximately 7200 rpm.

[0076] In this modification, the spring 36 of the above embodiment is not necessary, and the guide body 16 can be manufactured with a reduced number of parts.

[0077] In this modified example, contact portions 41, 42 serving as rotational resistance imparting means are formed between the inner peripheral surface of fulcrum guide 31 and other members (intervening members 34, 35) that come into contact with the inner peripheral surface of fulcrum guide 31. Generally, the inner peripheral surface of fulcrum guide 31 has a larger area than the end faces, so by using the inner peripheral surface of fulcrum guide 31 as rotational resistance imparting means, it becomes easier to adjust the frictional force.

[0078] In this modified example, intervening members 34, 35 are arranged between the fulcrum guide 31 and a shaft member 33 that rotatably supports the fulcrum guide 31, and contact portions 41, 42 serving as rotational resistance applying means are formed between the inner peripheral surface of the fulcrum guide 31 and the intervening members 34, 35. With this configuration, it is possible to adjust the frictional force at the contact portions 41, 42 by changing the shape, dimensions, material, etc. of the intervening members 34, 35, making it easier to adjust the rotation speed and peripheral speed of the fulcrum guide 31. [Explanation of symbols]

[0079] 10: Yarn winding machine 13: Bobbin holder (winding shaft) 16: Guide body 31: Fulcrum guide 33a: Shaft part 33b: Flange portion (pressed portion) 34, 35: Intervening member 34a, 35a: Thrust bearing part 34b, 35b: Radial bearing part 36: Spring (pressing member) 37: Rotational resistance imparting means 41, 42: Contact portion (rotational resistance applying means) B: Bobbin Y: Thread

Claims

1. A guide body having a fulcrum guide that serves as a fulcrum when the yarn is traversed and wound onto the bobbin, the fulcrum guide has a cylindrical shape and is rotatable around a central axis, A guide body characterized in that a rotational resistance imparting means is provided to impart rotational resistance to the fulcrum guide so that, when the fulcrum guide receives a torque of a predetermined value or more from the yarn running in contact with the outer peripheral surface of the fulcrum guide, the fulcrum guide rotates at a peripheral speed slower than the running speed of the yarn.

2. 2. The guide body according to claim 1, wherein the rotational resistance applying means applies a rotational resistance to the fulcrum guide so that the peripheral speed of the fulcrum guide is 5% or less of the running speed of the yarn.

3. 3. The guide body according to claim 2, wherein the rotational resistance applying means applies a rotational resistance to the fulcrum guide so that the peripheral speed of the fulcrum guide is 3.5% or less of the running speed of the yarn.

4. 4. The guide body according to claim 1, wherein the rotational resistance applying means applies a rotational resistance to the fulcrum guide so that the rotational speed of the fulcrum guide is 7400 rpm or less.

5. 5. The guide body according to claim 4, wherein the rotational resistance applying means applies a rotational resistance to the fulcrum guide so that the number of revolutions of the fulcrum guide is 5000 rpm or less.

6. The rotational resistance applying means is a pressed portion disposed on one side of the fulcrum guide in the axial direction; a pressing member that presses the fulcrum guide toward the pressed portion; The guide body according to any one of claims 1 to 5, characterized in that it has:

7. 7. The guide body according to claim 6, wherein an intervening member is disposed between the fulcrum guide and the pressed portion and / or between the fulcrum guide and the pressing member.

8. The intervening member is a thrust bearing portion that abuts against an end surface of the fulcrum guide; a radial bearing portion that abuts against an inner peripheral surface of the fulcrum guide; 8. The guide body according to claim 7, further comprising:

9. 9. The guide body according to claim 6, wherein the pressing member is a spring.

10. 10. The guide body according to claim 6, wherein the pressed portion is formed integrally with a shaft member that rotatably supports the fulcrum guide.

11. the rotational resistance applying means is a contact portion formed between the fulcrum guide and another member that contacts the fulcrum guide, The guide body according to any one of claims 1 to 5, characterized in that the frictional force at the contact portion is adjusted so that the peripheral speed of the fulcrum guide is slower than the running speed of the yarn.

12. The guide body according to claim 11, characterized in that the contact portion as the rotational resistance imparting means is formed between the inner surface of the fulcrum guide and the other member that contacts the inner surface of the fulcrum guide.

13. the other member is disposed between the fulcrum guide and a shaft member that rotatably supports the fulcrum guide, 13. The guide body according to claim 12, wherein the contact portion serving as the rotational resistance applying means is formed between an inner peripheral surface of the fulcrum guide and the other member.

14. A yarn winding machine that winds a plurality of yarns onto a plurality of bobbins attached to a winding shaft, A yarn winding machine, wherein a plurality of guide bodies according to any one of claims 1 to 13 are arranged in the axial direction of the winding shaft.

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