Spinning takeoff machine

Abstract

To reduce local wear of a fulcrum guide and to suppress early breakage of the fulcrum guide.SOLUTION: A spinning takeoff device 1 according to the present invention includes a guide body 16 having a fulcrum guide 31 and a control device 60. The control device 60 switches the rotation speed of the godet rollers 3, 4 between a first yarn winding speed and a first yarn threading speed. The control device 60 also switches the rotation speed of the bobbin holder 13 between a second yarn winding speed and a second yarn threading speed. The fulcrum guide 31 has a cylindrical shape and is rotatable around a central axis. In the spinning takeoff device 1, the maximum rotation speed of the fulcrum guide 31 during the acceleration period is greater than the maximum rotation speed of the fulcrum guide 31 during the constant speed period. The guide body 16 is provided with rotation resistance imparting means 37 that imparts a rotation resistance to the fulcrum guide 31 so that the rotation speed of the fulcrum guide 31 during the acceleration period is less than 14,400 rpm.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a yarn take-up device including a guide body having a fulcrum guide that serves as a fulcrum when a yarn is traversed and wound around a bobbin. [Background technology]

[0002] Conventionally, there has been known a spinning take-up device that winds a yarn spun from a spinning device onto a bobbin while traversing the yarn. Such a spinning take-up device is provided with a fulcrum guide that serves as a fulcrum when traversing the yarn. For example, in Patent Document 1, a cylindrical fulcrum guide is provided, and the yarn is hung on the outer peripheral surface of the fulcrum guide.

[0003] The fulcrum guide of Patent Document 1 is configured to rotate at a peripheral speed slower than the running speed of the yarn when the fulcrum guide receives a torque of a predetermined value or more from the running yarn. By rotating the fulcrum guide during yarn winding, the part of the outer circumferential surface of the fulcrum guide that comes into contact with the yarn can be changed, and localized wear of the outer circumferential surface of the fulcrum guide can be suppressed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-112481 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the configuration of Patent Document 1 has a problem in that the fulcrum guide is damaged early.

[0006] Therefore, an object of the present invention is to reduce localized wear of the fulcrum guide and to suppress early breakage of the fulcrum guide. [Means for solving the problem]

[0007] The yarn take-up device of the present invention is a yarn take-up device that winds multiple yarns fed by a yarn feed roller onto multiple bobbins attached to a bobbin holder, and includes a fulcrum guide that serves as a fulcrum when the yarn is wound around the bobbin attached to the bobbin holder while traversing, and a guide body that is provided between the yarn feed roller and the bobbin holder in the yarn running direction in which the yarn runs, a first switching control unit that switches the rotation speed of the yarn feed roller between a first yarn winding speed when the yarn is wound around the bobbin and a first threading speed that is slower than the first yarn winding speed when the yarn is threaded around the bobbin, and a second yarn winding speed that is slower than the second yarn winding speed when the yarn is threaded around the bobbin. and a second switching control unit which switches between the first and second constant speed periods, and the fulcrum guide has a cylindrical shape and is rotatable about a central axis, the maximum rotation speed of the fulcrum guide during an acceleration period in which the rotation speed of the yarn feed roller accelerates from the first yarn threading speed to the first yarn winding speed and the rotation speed of the bobbin holder accelerates from the second yarn threading speed to the second yarn winding speed is greater than the maximum rotation speed of the fulcrum guide during a constant speed period in which the rotation speed of the yarn feed roller is the first yarn winding speed and the rotation speed of the bobbin holder is the second yarn winding speed, and the guide body is provided with a rotational resistance applying means which applies a rotational resistance to the fulcrum guide such that the maximum rotation speed of the fulcrum guide during the acceleration period is less than 14,400 rpm.

[0008] The inventors of the present application conducted a thorough investigation into the cause of the problem of early breakage of the fulcrum guide, and came to the conclusion that one of the causes is that the rotation speed of the fulcrum guide during the acceleration period may be excessively large compared to the rotation speed of the fulcrum guide during the constant speed period, and a large torque is applied to the fulcrum guide during the acceleration period, resulting in a very large load on the bearing.The inventors then found that when the rotation speed of the fulcrum guide reaches approximately 14,000 rpm or more, the fulcrum guide is broken and the bearing wear becomes severe.Based on this finding, the rotation resistance to the fulcrum guide is adjusted so that the rotation speed of the fulcrum guide during the acceleration period is less than 14,400 rpm, and early breakage of the fulcrum guide and wear of the bearing are effectively suppressed.

[0009] The yarn take-up device of the present invention includes a contact roller that contacts the outer peripheral surfaces of the multiple bobbins attached to the bobbin holder, and a third switching control unit that switches the rotation speed of the contact roller between a third yarn winding speed when winding the yarn around the bobbin and a third threading speed that is slower than the third yarn winding speed and when the yarn is threaded around the bobbin, and it is preferable that during the acceleration period, the rotation speed of the contact roller accelerates from the third threading speed to the third yarn winding speed, and during the constant speed period, the rotation speed of the contact roller is the third yarn winding speed.

[0010] According to the present invention, in a configuration in which the rotation speed of the contact roller accelerates during the acceleration period, early damage to the fulcrum guide can be effectively suppressed.

[0011] In the spinning take-up device of the present invention, it is preferable that the rotational resistance imparting means imparts a rotational resistance to the fulcrum guide so that the maximum rotational speed of the fulcrum guide during the acceleration period is 12000 rpm or less.

[0012] By further reducing the rotation speed of the fulcrum guide to 12,000 rpm or less, early damage to the fulcrum guide can be further suppressed.

[0013] In the spinning take-up device of the present invention, it is preferable that the rotational resistance imparting means has a pressed portion arranged on one axial side of the fulcrum guide, and a pressing member that presses the fulcrum guide toward the pressed portion, and that an intervening member is arranged between the fulcrum guide and the pressed portion and / or between the fulcrum guide and the pressing member.

[0014] The pressing force of the pressing member can impart rotational resistance to the fulcrum guide. In addition, the pressing force acting on the fulcrum guide can be adjusted by the shape, dimensions, material, etc. of the intervening member, making it easier to adjust the number of rotations and peripheral speed of the fulcrum guide.

[0015] In the spinning take-off device of the present invention, the intervening member is preferably made of a PEEK resin.

[0016] According to the present invention, since the intermediate member is made of PEEK-based resin, which has excellent sliding properties and heat resistance, the intermediate member, which comes into direct contact with the rotating fulcrum guide, can be prevented from wearing down and deteriorating.

[0017] In the spinning yarn take-off device of the present invention, it is preferable that a dispersion member is disposed between the pressing member and the intervening member for dispersing a force from the pressing member toward the intervening member.

[0018] According to the present invention, it is possible to suppress localized application of force from the pressing member to the interposed member, thereby suppressing early damage to the interposed member.

[0019] In the spinning take-up device of the present invention, the fulcrum guide is preferably made of ceramic.

[0020] In the case of a ceramic fulcrum guide, wear of the yarn in contact with the fulcrum guide due to friction can be suppressed compared to the case of using a fulcrum guide made of other materials. On the other hand, a ceramic fulcrum guide has a tendency to be easily damaged. In a configuration using such a easily damaged ceramic fulcrum guide, the application of the present invention can more effectively suppress damage to the fulcrum guide. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a side view of the spinning take-up device according to the embodiment. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 2 is a block diagram showing the electrical configuration of the spinning take-up device. [Diagram 5] 4 is a graph showing the relationship between the peripheral speed of the bobbin holder and the tension of the thread hung on the bobbin holder. [Figure 6] 11 is a graph showing a change in the rotation speed of a fulcrum guide during an acceleration period. [Figure 7] 11 is a table showing the relationship between the spring strength and the maximum rotation speed of the fulcrum guide during the acceleration period. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of a yarn take-up device according to the present invention will be described with reference to the drawings.

[0023] (Yarn take-off device) 1 is a side view of the yarn take-off device 1 according to the present embodiment. In this specification, the front, rear, left, right, top and bottom directions shown in FIG.

[0024] The yarn take-off 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 (yarn sending rollers of the present invention) and a yarn winding machine 10. The spinning device 2 is disposed above the yarn take-off 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 rotated by roller motors 51 and 52 (see FIG. 4), which will be described later. 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.

[0025] The yarn winding machine 10 is disposed below the godet rollers 3 and 4. The yarn winding machine 10 has two bobbin holders 13 supported at one end by a turret 12 built into a machine base 11. The bobbin holder 13 extends in the front-rear direction, and its rear end is supported by the turret 12. A plurality of bobbins B can be attached to the bobbin holder 13 in the front-rear direction. The bobbin holder 13 is driven to rotate about its axis by a winding motor 53 (see FIG. 4), which will be described later.

[0026] The turret 12 is a disk-shaped member having a rotation axis parallel to the front-rear direction, and has bobbin holders 13 attached at 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 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. Meanwhile, in the bobbin holder 13 in the lower position, the plurality of packages P are collected and new a plurality of bobbins B are attached.

[0027] The yarn winding machine 10 has a support frame 14 supported at one end by the 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 number of which is the same as the number of yarns Y, arranged side by side in the front-rear direction. The support frame 14 has traverse devices 17, the number of which is the same 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 with the corresponding guide bodies 16 as fulcrums.

[0028] A contact roller 18 rotatably supported by the support frame 14 is disposed below the support frame 14. The contact roller 18 comes into contact with the outer circumferential surfaces of the bobbins B attached to the bobbin holder 13 at the upper position, or with the outer circumferential surfaces of the packages P formed by winding the yarn Y around the bobbins B. During yarn winding, the contact roller 18 rotates while applying a predetermined contact pressure to the packages P, thereby shaping the packages P. The contact roller 18 is rotationally driven by a CR motor 54 (see FIG. 4), which will be described later.

[0029] (Electrical configuration of the spinning take-off device) Next, the electrical configuration of the yarn take-up device 1 of this embodiment will be described with reference to Fig. 4. Fig. 4 is a block diagram showing the electrical configuration of the yarn take-up device 1. The yarn take-up device 1 has a control device 60. The control device 60 is electrically connected to the roller motor 51, the roller motor 52, the winding motor 53, and the CR motor 54.

[0030] The control device 60 controls the roller motor 51 to switch the rotation speed of the godet roller 3 between a first yarn winding speed and a first threading speed. The first yarn winding speed of the godet roller 3 is the rotation speed of the godet roller 3 when the yarn Y is wound around the bobbin B by the yarn winding machine 10. The first threading speed of the godet roller 3 is the rotation speed of the godet roller 3 when the yarn Y is wound around the bobbin B, which is slower than the first yarn winding speed. The control device 60 also controls the roller motor 52 to switch the rotation speed of the godet roller 4 between the first yarn winding speed and the first threading speed. The first yarn winding speed of the godet roller 4 is the rotation speed of the godet roller 4 when the yarn Y is wound around the bobbin B by the yarn winding machine 10. The first yarn threading speed of the godet roller 4 is the rotation speed of the godet roller 4 when the yarn Y is wound around the bobbin B, which is slower than the first yarn winding speed. As described above, the control device 60 of this embodiment corresponds to the first switching control unit of the present invention. Note that the first yarn winding speed and the first yarn threading speed of the godet roller 3 and the first yarn winding speed and the first yarn threading speed of the godet roller 4 may be different or the same.

[0031] The control device 60 also controls the winding motor 53 to switch the rotation speed of the bobbin holder 13 between a second yarn winding speed and a second threading speed. The second yarn winding speed is the rotation speed of the bobbin holder 13 when the yarn Y is wound around the bobbin B by the yarn winding machine 10. The second threading speed is the rotation speed of the bobbin holder 13 that is slower than the second yarn winding speed and when the yarn Y is threaded around the bobbin B. As described above, the control device 60 of this embodiment also corresponds to the second switching control unit of the present invention.

[0032] Furthermore, the control device 60 controls the CR motor 54 to switch the rotation speed of the contact roller 18 between a third yarn winding speed and a third threading speed. The third yarn winding speed is the rotation speed of the contact roller 18 when the yarn Y is wound around the bobbin B by the yarn winding machine 10. The third threading speed is the rotation speed of the contact roller 18 that is slower than the third yarn winding speed and when the yarn Y is threaded around the bobbin B. As described above, the control device 60 of this embodiment also corresponds to the third switching control unit of the present invention.

[0033] (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 located at the winding position, and Fig. 2b shows a state in which the multiple guide bodies 16 are located at the threading position. The winding position is the position of the multiple guide bodies 16 when multiple yarns Y are wound around multiple bobbins B. The threading position is the position of the multiple guide bodies 16 when multiple yarns Y are hung on the multiple guide bodies 16. The multiple guide bodies 16 are configured to be movable between the winding position and the threading position.

[0034] The machine includes a guide unit 15, a plurality of guide bodies 16, a plurality of sliders 21, a guide rail 22, and an air cylinder 23. The sliders 21 are provided in the same number as the guide bodies 16, and each guide body 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). The guide rail 22 is slidably attached to the guide rail 22 in a state where the plurality of sliders 21 are arranged in the front-rear direction. The 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. The rod 23a of the air cylinder 23 is connected to the slider 21 on the rearmost side. 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.

[0035] As shown in Fig. 2a, when the rod 23a of the air cylinder 23 is contracted, the multiple sliders 21 are lined up in the front-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 Fig. 2b, when the rod 23a of the air cylinder 23 is extended, the multiple sliders 21 gather at the front end of the guide rail 22. The position of the multiple guide bodies 16 at this time is the threading position.

[0036] 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-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 hung on the front side of the guide body 16, while the eight yarns Y in the rear half are hung on the rear side of the guide body 16. In addition, 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.

[0037] (Guide body) The guide body 16 will 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 guide body 16 is provided between the godet roller 4 and the bobbin holder 13 in the yarn running direction in which the yarn Y runs. The fulcrum guide 31 serves as a fulcrum when the yarn Y is wound around the bobbin B attached to the bobbin holder 13 while traversing. 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 around the 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. The material of the fulcrum guide 31 is not limited, but is preferably made of ceramic, for example.

[0038] 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 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 is formed with a female screw portion 32d penetrating in the left-right direction. The fixing member 32 is fixed to the slider 21 by 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.

[0039] 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 fitted onto the shaft portion 33a. The flange portion 33b is an annular portion that spreads outward in the radial direction of the shaft portion 33a from the right end 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.

[0040] Resin intervening members 34, 35 are disposed adjacent to the fulcrum guide 31 on both axial sides of the fulcrum guide 31. The intervening members 34, 35 are circular members having 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 of the fulcrum guide 31 and the shaft member 33 can be suppressed. The intervening members 34, 35 are made of, for example, a PEEK-based resin.

[0041] The thrust bearing portion 34a of the right-side 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 face of the fulcrum guide 31. The thrust bearing portion 35a of the left-side intermediate member 35 is disposed between the fulcrum guide 31 and the spring 36 via a distribution ring 45 (described later) 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.

[0042] A distribution ring 45 (dispersion member of the present invention) is provided between the spring 36 and the thrust bearing portion 35a of the interposed member 35. The distribution ring 45 is a circular member. The distribution ring 45 is a member for dispersing the force from the spring 36 toward the interposed member 35. The distribution ring 45 may be made of, for example, metal or resin.

[0043] 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, whereby the shaft member 33 is fixed 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 disposed in the recess 32c of the fixing member 32.

[0044] (Threading period, acceleration period, constant speed period) In the yarn take-off device 1 of this embodiment, the control device 60 controls the driving of each motor to have a threading period, an acceleration period, and a constant speed period. Specifically, the threading period is a period during which the yarn Y is wound around the bobbin B attached to the bobbin holder 13 at the upper position. During the threading period, the rotation speed of the godet rollers 3 and 4 is a first threading speed, the rotation speed of the bobbin holder 13 is a second threading speed, and the rotation speed of the contact roller 18 is a third threading speed. In other words, the control device 60 controls the driving of each motor so that during the threading period, the rotation speed of the godet rollers 3 and 4 is a constant speed at the first threading speed, the rotation speed of the bobbin holder 13 is a constant speed at the second threading speed, and the rotation speed of the contact roller 18 is a constant speed at the third threading speed.

[0045] The acceleration period is a period when the rotation speed of the bobbin holder 13 accelerates to the yarn winding speed after the yarn Y is wound on the bobbin holder 13. During the acceleration period, the rotation speed of the godet rollers 3 and 4 accelerates from the first yarn threading speed to the first yarn winding speed, the rotation speed of the bobbin holder 13 accelerates from the second yarn threading speed to the second yarn winding speed, and the rotation speed of the contact roller 18 accelerates from the third yarn threading speed to the third yarn winding speed. In other words, the control device 60 controls the driving of each motor so that during the acceleration period, the rotation speed of the godet rollers 3 and 4 accelerates from the first yarn threading speed to the first yarn winding speed, the rotation speed of the bobbin holder 13 accelerates from the second yarn threading speed to the second yarn winding speed, and the rotation speed of the contact roller 18 accelerates from the third yarn threading speed to the third yarn winding speed.

[0046] The constant speed period is a period during which the rotation speed of the bobbin holder 13 in the upper position is constant at the yarn winding speed. During the constant speed period, the rotation speed of the godet rollers 3 and 4 is the first yarn winding speed, the rotation speed of the bobbin holder 13 is the second yarn winding speed, and the rotation speed of the contact roller 18 is the third yarn winding speed. In other words, the control device 60 controls the driving of each motor so that during the constant speed period, the rotation speed of the godet rollers 3 and 4 is constant at the first yarn winding speed, the rotation speed of the bobbin holder 13 is constant at the second yarn winding speed, and the rotation speed of the contact roller 18 is constant at the third yarn winding speed.

[0047] The maximum rotation speed of the fulcrum guide 31 that rotates by coming into contact with the yarn Y during the acceleration period is greater than the maximum rotation speed of the fulcrum guide 31 during the constant speed period.

[0048] When the yarn take-up device 1 shifts from the acceleration period to the constant speed period, the turret 12 first rotates to move the bobbin holder 13, on which the bobbin B around which the yarn Y was wound during the acceleration period is attached, to the lower position, and moves the bobbin holder 13 on which the empty bobbin B is attached, to the upper position. After that, the yarn Y is wound around the bobbin B attached to the bobbin holder 13 newly moved to the upper position, to form a package P.

[0049] Here, in the configuration of the above-mentioned Patent Document 1 (JP Patent Publication No. 2022-112481), a problem was observed in which the fulcrum guide was damaged early. In response to this, the inventors of the present application conducted an intensive investigation into the cause of the problem of the fulcrum guide being damaged early. As a result, they came to estimate that one of the causes was that the rotation speed of the fulcrum guide during the acceleration period may be excessively large compared to the rotation speed of the fulcrum guide during the constant speed period, and a large torque is applied to the fulcrum guide during the acceleration period, resulting in a very large load on the bearing. Then, they obtained the knowledge that when the rotation speed of the fulcrum guide becomes approximately 14,000 rpm or more, the fulcrum guide 31 is damaged and the wear of the bearing becomes severe. This will be explained in detail below.

[0050] (Changes in thread tension during acceleration and constant speed periods) First, the transition of the tension of the yarn Y during the acceleration period and the constant speed period will be described below with reference to Fig. 5. Fig. 5 is a graph showing the time dependence of the peripheral speed V1 [m / min] of the bobbin holder 13 and the tension T [cN] of the yarn Y applied to the bobbin holder 13 at the same time in order to know the relationship between the peripheral speed V1 [m / min] of the bobbin holder 13 and the tension T [cN] of the yarn Y. The peripheral speed V1 [m / min] of the bobbin holder 13 and the tension T [cN] of the yarn Y shown in Fig. 5 are values ​​when the yarn take-up device 1 of this embodiment is used.

[0051] The horizontal axis in Fig. 5 indicates the elapsed time [sec]. The tension T of the yarn Y is a measured value of the tension T of the yarn Y running between the fulcrum guide 31 and the godet roller 4. The measured value of the tension T of the yarn Y is a value obtained by selecting one fulcrum guide 31 from the multiple fulcrum guides 31 and measuring the tension T of the yarn Y running between the fulcrum guide 31 and the godet roller 4. It is assumed that the tension T of the yarn Y will behave in the same manner regardless of which fulcrum guide 31 is selected.

[0052] 5, the peripheral speed V1 of the bobbin holder 13 has a period of constant speed of about 1700 m / min (0 sec to about 2 sec), a period of acceleration from about 1700 m / min to about 4300 m / min (about 2 sec to about 37 sec), and a period of constant speed at about 4300 m / min (about 37 sec to 50 sec). These indicate a threading period (0 sec to about 2 sec), an acceleration period (about 2 sec to about 37 sec), and a constant speed period (about 37 sec to 50 sec), respectively. The timing at which the peripheral speed V1 of the bobbin holder 13 changes, i.e., the timing at which the rotation speed of the bobbin holder 13 changes, is the same as the timing at which the rotation speeds of the godet rollers 3 and 4 and the contact roller 18 change. In FIG. 5, the peripheral speed V1 of the bobbin holder 13 is shown to indicate the yarn winding period, the acceleration period, and the constant speed period, and the peripheral speeds (or rotation speeds) of the godet rollers 3 and 4 and the contact roller 18, which behave similarly to the transition of the peripheral speed V1 (or rotation speed) of the bobbin holder 13, are omitted. In addition, in FIG. 5, only the last part of the yarn winding period is shown, but in reality, the yarn winding period is generally longer than 2 seconds. Similarly, in FIG. 5, only the first part of the constant speed period is shown, but in reality, the constant speed period is much longer than the acceleration period. In addition, although not shown in FIG. 5, during the constant speed period, the tension T of the yarn Y when the package P is formed by winding the yarn Y around the bobbin B is 10 cN or less.

[0053] As shown in FIG. 5, the tension T of the thread Y during the acceleration period (approximately 2 sec to approximately 37 sec in FIG. 5) is generally greater than the tension T of the thread Y during the constant speed period (approximately 37 sec to 50 sec in FIG. 5). Also, as shown in FIG. 5, the degree of fluctuation of the tension T of the thread Y during the acceleration period is greater than the degree of fluctuation of the tension T of the thread Y during the constant speed period. Specifically, the tension T of the thread Y is constantly fluctuating during the acceleration period, whereas the tension T of the thread Y initially decreases significantly and then remains approximately constant during the constant speed period. As described above, the tension T of the thread Y is large and unstable during the acceleration period. The inventors of the present application presume that this increases the torque applied from the thread Y to the fulcrum guide 31, which results in the fulcrum guide 31 rotating excessively, resulting in increased loads on the fulcrum guide 31 and bearings (for example, the thrust bearings 34a, 35a and the radial bearings 34b, 35b).

[0054] (Behavior of the support guide during acceleration) Next, the behavior of the fulcrum guide 31 during the acceleration period will be described below with reference to Figs. 6 and 7. Fig. 6 is a graph showing the change in the rotation speed [rpm] of the fulcrum guide 31 during the acceleration period. Fig. 7 is a table showing the relationship between the strength [gf] of the spring 36 and the maximum rotation speed [rpm] of the fulcrum guide 31 during the acceleration period. The rotation speed of the fulcrum guide 31 shown in Figs. 6 and 7 is a value when the fulcrum guide of the above-mentioned Patent Document 1 is used. It should be noted that the strength [gf] of the spring 36 shown in Fig. 7 is adjusted to change the maximum rotation speed [rpm] of the fulcrum guide 31, and does not mean that the strength of the spring 36 of the present invention is limited to this value.

[0055] The vertical axis of FIG. 6 indicates the rotation speed [sec] of the fulcrum guide 31. The horizontal axis of FIG. 6 indicates the passage of time [sec]. In FIG. 6, the time when the rotation speed of the fulcrum guide 31 suddenly drops is set to 0 sec. As shown in FIG. 6, after the rotation speed of the fulcrum guide 31 reaches 14,400 rpm, the rotation speed suddenly drops to about 3,000 rpm. This is considered to be caused by the occurrence of whirling of the fulcrum guide 31. FIG. 7 shows that whirling of the fulcrum guide 31 occurs when the maximum rotation speed of the fulcrum guide 31 is 14,400 rpm. The whirling of the fulcrum guide 31 is confirmed visually.

[0056] The whirling of the fulcrum guide 31 will be described. In the guide body 16 as in Patent Document 1 and this embodiment, there are some gaps between the fulcrum guide 31 and the radial bearing parts 34b, 35b, between the shaft part 33a and the radial bearing parts 34b, 35b, between the flange part 33b and the thrust bearing part 34a, and the like. When the rotation speed of the fulcrum guide 31 increases, each member moves to fill the gap due to centrifugal force. However, since the direction of movement of each member is different, the fulcrum guide 31 vibrates. This is the whirling of the fulcrum guide 31. When the fulcrum guide 31 whirls, the fulcrum guide 31 and the bearings (for example, the thrust bearing parts 34a, 35a, the radial bearing parts 34b, 35b) are damaged and may eventually be damaged. In particular, when the fulcrum guide 31 is made of ceramic, the risk of damage to the fulcrum guide 31 increases when the fulcrum guide 31 whirls. Furthermore, as a result of the fulcrum guide 31 swinging, the posture of the fulcrum guide 31 is lost and it becomes unable to rotate normally. Then, the number of rotations of the fulcrum guide 31 drops suddenly. This state is considered to be shown at 0 sec in FIG. 6.

[0057] (Rotational resistance imparting means) Based on the above findings, in order to prevent early damage to the fulcrum guide 31, in this embodiment, a rotational resistance applying means 37 is provided that applies a rotational resistance to the fulcrum guide 31 so that the maximum rotational speed of the fulcrum guide 31 during the acceleration period is less than 14,400 rpm. The rotational resistance applying means 37 is adjusted so that the rotational speed of the fulcrum guide 31 is 14,400 rpm or less when the fulcrum guide 31 receives torque from the yarn Y of a predetermined value or more. The predetermined value is a predetermined torque value that the fulcrum guide 31 receives during the acceleration period. 14,400 rpm is the rotational speed of the fulcrum guide 31 when the fulcrum guide 31 starts to swing as described above, and is a circumferential speed that is slower than the running speed of the yarn Y during the acceleration period.

[0058] The predetermined value is preferably larger than the torque value that the fulcrum guide 31 receives during the constant speed period when the thread Y is being wound onto the bobbin B attached to the bobbin holder 13 at the upper position. In other words, the rotational resistance imparting means 37 preferably imparts a rotational resistance to the fulcrum guide 31 so that the fulcrum guide 31 does not rotate during the constant speed period when the thread Y is being wound onto the bobbin B attached to the bobbin holder 13 at the upper position. However, the predetermined value is not limited to this.

[0059] The fulcrum guide 31 may be subjected to a torque equal to or greater than a predetermined value even during the constant speed period. Even in this case, the fulcrum guide 31 is rotated at a rotation speed of less than 14,400 rpm by the rotation resistance applied by the rotation resistance applying means 37.

[0060] The configuration of the rotational resistance imparting means 37 of this embodiment will be specifically described. The rotational resistance imparting 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 against the flange portion 33b, thereby increasing the frictional resistance when the fulcrum guide 31 rotates, and thus imparting rotational resistance. As a result, the number of rotations of the fulcrum guide 31 can be reduced.

[0061] 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 maximum rotational speed of the fulcrum guide 31 during the acceleration period is adjusted by the rotational resistance applying means 37 so as to be less than 14,400 rpm, more preferably 12,000 rpm or less, and further preferably 6,000 rpm or less.

[0062] Furthermore, if the rotation speed of the fulcrum guide 31 is small, a precision bearing structure such as a ball bearing is not required, and a simple bearing structure such as a sliding bearing can suffice, which has the secondary effect of further reducing costs.

[0063] In addition, in the guide body 16 (one of the multiple guide bodies 16 that is closer to the end, see FIG. 2) that has a large contact angle (wrap angle) with the yarn Y, the frictional force between the yarn Y and the fulcrum guide 31 is large. On the other hand, in the guide body 16 (one of the multiple guide bodies 16 that is closer to the center, see FIG. 2) that has a small contact angle (wrap angle) with the yarn Y, the frictional force between the yarn Y and the fulcrum guide 31 is small. For this reason, the timing at which the torque acting on the fulcrum guide 31 exceeds the above-mentioned predetermined value differs between the guide body 16 that has a large contact angle (wrap angle) with the yarn Y and the guide body 16 that has a small contact angle (wrap angle) with the yarn Y. Then, in the guide body 16 that has a large contact angle (wrap angle) with the yarn Y, the torque acting on the fulcrum guide 31 exceeds the above-mentioned predetermined value, but in the guide body 16 that has a small contact angle (wrap angle) with the yarn Y, the torque acting on the fulcrum guide 31 may not exceed the above-mentioned predetermined value. However, this is not particularly problematic.

[0064] If the torque acting on the fulcrum guide 31 due to the frictional force with the yarn Y does not reach the above-mentioned predetermined value, that is, if the fulcrum guide 31 is not rotated by the running yarn Y, the yarn Y continues to contact the same part of the outer circumferential surface of the fulcrum guide 31, causing local 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 above-mentioned predetermined value, and the fulcrum guide 31 rotates slightly. Then, when the yarn Y comes into contact with a part of the fulcrum guide 31 that is not worn, the fulcrum guide 31 stops rotating again. Even with such a behavior of the fulcrum guide 31, local wear of the fulcrum guide 31 can be suppressed, and changes in yarn quality caused by the yarn Y continuing to contact the worn part of the fulcrum guide 31 can be suppressed.

[0065] (effect) The yarn take-up device 1 of this embodiment is a yarn take-up device that winds a plurality of yarns Y sent by godet rollers 3 and 4 onto a plurality of bobbins B attached to a bobbin holder 13. The yarn take-up device 1 includes a guide body 16 having a fulcrum guide 31 that serves as a fulcrum when the yarn Y is wound onto the bobbin B attached to the bobbin holder 13 while traversing, and a control device 60 (a first switching control unit and a second switching control unit of the present invention). The guide body 16 is provided between the godet roller 4 and the bobbin holder 13 in the yarn running direction in which the yarn Y runs. The control device 60 switches the rotation speed of the godet rollers 3 and 4 between a first yarn winding speed when the yarn is wound onto the bobbin B and a first threading speed when the yarn Y is threaded onto the bobbin B, which is slower than the first yarn winding speed. The control device 60 also switches the rotation speed of the bobbin holder 13 between a second yarn winding speed when winding the yarn around the bobbin B and a second threading speed that is slower than the second yarn winding speed and when the yarn Y is wound around the bobbin B. The fulcrum guide 31 has a cylindrical shape and is rotatable around the central axis. In the yarn take-up device 1 of this embodiment, the maximum rotation speed of the fulcrum guide 31 in an acceleration period in which the rotation speed of the godet rollers 3 and 4 accelerates from the first yarn winding speed to the first yarn winding speed and the rotation speed of the bobbin holder 13 accelerates from the second yarn winding speed to the second yarn winding speed is greater than the maximum rotation speed of the fulcrum guide 31 in a constant speed period in which the rotation speed of the godet rollers 3 and 4 is the first yarn winding speed and the rotation speed of the bobbin holder 13 is the second yarn winding speed. The guide body 16 is provided with a rotational resistance applying means 37 that applies a rotational resistance to the fulcrum guide 31 so that the maximum rotation speed of the fulcrum guide 31 during the acceleration period is less than 14,400 rpm.

[0066] The inventors of the present application conducted an intensive investigation into the cause of the problem of early breakage of the fulcrum guide 31, and came to estimate that one of the causes is that the rotation speed of the fulcrum guide 31 during the acceleration period may be excessively large compared to the rotation speed of the fulcrum guide 31 during the constant speed period, causing a large torque to be applied to the fulcrum guide 31 during the acceleration period, and the load on the bearing becomes very large (see the above description of "Changes in thread tension during acceleration period and constant speed period" for details). Then, they found that when the rotation speed of the fulcrum guide 31 reaches approximately 14,000 rpm or more, the fulcrum guide 31 breaks and the bearing wears rapidly (see the above description of "Behavior of the fulcrum guide during acceleration period" for details). Based on this finding, the rotation resistance to the fulcrum guide 31 was adjusted so that the maximum rotation speed of the fulcrum guide 31 during the acceleration period was less than 14,400 rpm, and early breakage of the fulcrum guide 31 and wear of the bearing were effectively suppressed. Furthermore, in the spinning take-up device 1 of this embodiment, the fulcrum guide 31 is configured to rotate at least during the acceleration period, so that local wear on the outer circumferential surface of the fulcrum guide 31 can be reduced.

[0067] The yarn take-up device 1 of this embodiment also includes a contact roller 18 that contacts the outer circumferential surfaces of the multiple bobbins B attached to the bobbin holder 13. The control device 60 switches the rotation speed of the contact roller 18 between a third yarn winding speed when winding the yarn Y around the bobbin B and a third threading speed that is slower than the third yarn winding speed and when winding the yarn Y around the bobbin B. During the acceleration period, the rotation speed of the contact roller 18 accelerates from the third threading speed to the third yarn winding speed, and during the constant speed period, the rotation speed of the contact roller 18 is the third yarn winding speed. This effectively prevents early damage to the fulcrum guide 31 in a configuration in which the rotation speed of the contact roller 18 accelerates during the acceleration period.

[0068] In the spinning take-up device 1 of the present embodiment, the rotational resistance imparting means 37 imparts a rotational resistance to the fulcrum guide 31 so that the maximum rotational speed of the fulcrum guide 31 during the acceleration period is preferably 12000 rpm or less. Thus, by further reducing the rotational speed of the fulcrum guide 31 to 12000 rpm or less, early damage to the fulcrum guide 31 can be further suppressed.

[0069] In the spinning take-up device 1 of this embodiment, the rotational resistance imparting means 37 has a flange portion 33b arranged on one side of the fulcrum guide 31 in the axial direction, and a spring 36 that presses the fulcrum guide 31 toward the flange portion 33b, and the intervening members 34, 35 are arranged between the fulcrum guide 31 and the flange portion 33b and between the fulcrum guide 31 and the spring 36. This allows the rotational resistance to be imparted to the fulcrum guide 31 by the pressing force of the spring 36. In addition, the pressing force acting on the fulcrum guide 31 can be adjusted by the shape, dimensions, material, etc. of the intervening members 34, 35, making it easy to adjust the rotation speed and peripheral speed of the fulcrum guide 31.

[0070] Furthermore, in the spinning take-up device 1 of the present embodiment, the intermediate members 34, 35 are made of PEEK-based resin. Since the intermediate members 34, 35 are made of PEEK-based resin, which has excellent sliding properties and heat resistance, the intermediate members 34, 35, which are in direct contact with the rotating fulcrum guide 31, can be prevented from being worn down and deteriorated.

[0071] In the spinning take-up device 1 of the present embodiment, a distribution ring 45 for dispersing the force from the spring 36 to the intervening member 35 is disposed between the spring 36 and the intervening member 35. This makes it possible to suppress the force from being locally applied from the spring 36 to the intervening member 35, and to suppress early damage to the intervening member 35.

[0072] In the spinning take-off device 1 of the present embodiment, the fulcrum guide 31 is preferably made of ceramic. In the case of a ceramic fulcrum guide, wear of the yarn in contact with the fulcrum guide due to friction can be suppressed compared to the case of using a fulcrum guide made of other materials. On the other hand, a ceramic fulcrum guide has a tendency to be easily damaged. In a configuration using such a easily damaged ceramic fulcrum guide, the application of the present invention can more effectively suppress damage to the fulcrum guide.

[0073] (Modification) Modifications of the above embodiment will be described below, with the same reference numerals being used to designate components similar to those in the above embodiment, and descriptions thereof will be omitted where appropriate.

[0074] 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.

[0075] 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.

[0076] 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. In addition, the specific shapes and materials of the intervening members 34 and 35 are not limited to those in the above embodiment.

[0077] In the above embodiment, the multiple guide bodies 16 are movable between the winding position and the threading position. However, it is not essential that the multiple guide bodies 16 are configured to be movable.

[0078] In the above embodiment, the rotational resistance applying means 37 is configured by the spring 36 and the flange portion 33b. However, the specific configuration of the rotational resistance applying means is not limited to this.

[0079] In the above embodiment, the control device 60 corresponds to the first switching control unit, the second switching control unit, and the third switching control unit of the present invention. However, the first switching control unit, the second switching control unit, and the third switching control unit may be provided separately.

[0080] In the above embodiment, the rotation speed of the contact roller 18 is configured to be switchable between the third threading speed and the third thread winding speed. However, the contact roller 18, which comes into contact with the outer circumferential surface of the bobbin B or the outer circumferential surface of the package P attached to the bobbin holder 13, may be configured to rotate in response to the rotation of the bobbin holder 13.

[0081] In the above embodiment, PEEK resin is used for the intervening members 34 and 35. However, other resins such as POM (polyacetal) may be used for the intervening members 34 and 35.

[0082] In the above embodiment, the distribution ring 45 is disposed between the spring 36 and the interposition member 35. However, disposing the distribution ring 45 is not essential. [Explanation of symbols]

[0083] 1. Spinning take-off device 3 Godet roller (yarn feed roller) 4 Godet roller (yarn feed roller) 10 Yarn winding machine 1 13 Bobbin holder 16 Guide body 18 Contact roller 31 Fulcrum Guide 33b Flange portion (pressed portion) 36 Spring (pressing member) 37 Rotational resistance imparting means 45 Dispersion ring (dispersion member) 60 control device (first switching control unit, second switching control unit, third switching control unit) B Bobbin P Package Y Thread

Claims

1. A spinning and taking device that winds multiple threads fed by a thread feed roller onto multiple bobbins mounted on a bobbin holder, The bobbin holder has a pivot guide that serves as a pivot point when winding the thread onto the bobbin while traversing it, and a guide body provided between the thread feed roller and the bobbin holder in the direction in which the thread travels, A first switching control unit that switches the rotation speed of the thread feed roller between a first thread winding speed when winding the thread onto the bobbin and a first thread threading speed that is slower than the first thread winding speed when threading the thread onto the bobbin, A second switching control unit that switches the rotation speed of the bobbin holder between a second thread winding speed when winding the thread onto the bobbin and a second thread threading speed that is slower than the second thread winding speed and when threading the thread onto the bobbin, Equipped with, The aforementioned pivot guide has a cylindrical shape and is rotatable around its central axis. The maximum rotational speed of the pivot guide during the acceleration period, which is the period in which the rotational speed of the thread feed roller accelerates from the first threading speed to the first thread winding speed and the rotational speed of the bobbin holder accelerates from the second threading speed to the second thread winding speed, is The rotational speed of the thread feed roller is greater than the maximum rotational speed of the pivot guide during the constant speed period when the rotational speed of the bobbin holder is the first thread winding speed, A spinning take-up device characterized in that the guide body is provided with a rotational resistance applying means for applying rotational resistance to the pivot guide such that the maximum rotational speed of the pivot guide during the acceleration period is less than 14,400 rpm.

2. A contact roller that contacts the outer circumferential surface of the plurality of bobbins mounted on the bobbin holder, A third switching control unit that switches the rotation speed of the contact roller between a third thread winding speed when winding the thread onto the bobbin and a third thread threading speed that is slower than the third thread winding speed when threading the thread onto the bobbin, Equipped with, During the acceleration period, the rotational speed of the contact roller accelerates from the third thread-threading speed to the third thread-winding speed. The spinning take-up device according to claim 1, characterized in that during the constant speed period, the rotation speed of the contact roller is the third yarn winding speed.

3. The spinning take-up device according to claim 1, characterized in that the rotational resistance applying means applies rotational resistance to the pivot guide such that the maximum rotational speed of the pivot guide during the acceleration period is 12,000 rpm or less.

4. The spinning take-up device according to claim 2, characterized in that the rotational resistance applying means applies rotational resistance to the pivot guide such that the maximum rotational speed of the pivot guide during the acceleration period is 12,000 rpm or less.

5. The rotational resistance applying means is A pressed portion is positioned on one side in the axial direction of the aforementioned pivot guide, A pressing member that presses the pivot guide toward the part to be pressed, It has, The spinning take-up device according to claim 1, characterized in that an intervening member is arranged between the pivot guide and the pressed portion, and / or between the pivot guide and the pressing member.

6. The rotational resistance applying means is A pressed portion is positioned on one side in the axial direction of the aforementioned pivot guide, A pressing member that presses the pivot guide toward the part to be pressed, It has, The spinning take-up device according to claim 2, characterized in that an intervening member is arranged between the pivot guide and the pressed portion, and / or between the pivot guide and the pressing member.

7. The rotational resistance applying means is A pressed portion is positioned on one side in the axial direction of the aforementioned pivot guide, A pressing member that presses the pivot guide toward the part to be pressed, It has, The spinning take-up device according to claim 3, characterized in that an intervening member is arranged between the pivot guide and the pressed portion, and / or between the pivot guide and the pressing member.

8. The rotational resistance-applying means is A pressed portion is positioned on one side in the axial direction of the aforementioned pivot guide, A pressing member that presses the pivot guide toward the part to be pressed, It has, The spinning take-up device according to claim 4, characterized in that an intervening member is arranged between the pivot guide and the pressed portion, and / or between the pivot guide and the pressing member.

9. The spinning and drawing apparatus according to claim 5, characterized in that the intervening member is made of a PEEK-based resin.

10. The spinning and drawing device according to claim 6, characterized in that the intervening member is made of a PEEK resin.

11. The spinning and drawing device according to claim 7, characterized in that the intervening member is made of a PEEK resin.

12. The spinning and drawing device according to claim 8, characterized in that the intervening member is made of a PEEK resin.

13. The spinning take-up device according to any one of claims 5 to 12, characterized in that a dispersion member is arranged between the pressing member and the intervening member to disperse the force directed from the pressing member toward the intervening member.

14. The spinning take-up device according to any one of claims 1 to 12, characterized in that the pivot guide is made of ceramic.

15. The spinning take-up device according to claim 13, characterized in that the pivot guide is made of ceramic.

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