Yarn feeding device and false twisting machine

Abstract

To provide a yarn feeding device capable of reducing load of maintenance work and suppressing cost.SOLUTION: A yarn feeding device 30 has a plurality of drive rollers 33 fixed to a drive shaft 31 driven to rotate and a plurality of follower rollers 34 that rotate by receiving rotation power from the plurality of drive rollers 33 by coming into contact with peripheral surfaces of the plurality of drive rollers 33. A power receiving section 35 coming into contact with the peripheral surface of the drive roller 33 is formed on a portion in an axial direction of the follower roller 34, and a yarn feeding section 36 without contact with the peripheral surface of the drive roller 33 is formed on a portion in the axial direction of the drive roller. A yarn Y is wound around the yarn feeding section 36.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a yarn feeding device that feeds a plurality of yarns and a false twisting machine that includes the yarn feeding device. [Background technology]

[0002] In a yarn processing machine equipped with a crimping section that crimps synthetic fiber yarn, a yarn feeding device is known that sandwiches the yarn between a drive roller and a driven roller and feeds it. For example, a false twisting machine described in Patent Document 1 is provided with a yarn feeding device that has multiple drive rollers fixed to a rotationally driven shaft and multiple driven rollers that contact the peripheral surfaces of the multiple drive rollers. In this yarn feeding device, the yarn is sandwiched between the drive roller and the driven roller, and the yarn is fed by the rotation of the drive roller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-132843 Summary of the Invention [Problem to be solved by the invention]

[0004] In the so-called nip roller type yarn feeding device described in Patent Document 1, the yarn is fed while being sandwiched between a drive roller and a driven roller. Therefore, if the contact state between the circumferential surfaces of the drive roller and the driven roller is not appropriate, the yarn may slip. To prevent the yarn from slipping, adjustment is required to make the drive roller and the driven roller strictly parallel, which requires a great deal of effort for maintenance work.

[0005] Therefore, instead of using a nip roller-type yarn feeding device, it is possible to feed the yarn using a godet roller that is driven to rotate by a motor. In this case, the yarn only needs to be wound around the circumferential surface of the godet roller, and the yarn is not sandwiched between two rollers, so maintenance work to keep the two rollers parallel is not necessary. However, there is a problem in that it is necessary to prepare the same number of motorized godet rollers as the number of yarns, which increases costs.

[0006] The present invention has been made in view of the above problems, and has an object to provide a yarn feeding device that can reduce the burden of maintenance work and keep costs down. [Means for solving the problem]

[0007] The yarn feeding device of the present invention is a yarn feeding device provided in a yarn processing machine equipped with a crimping section that crimps yarn made of synthetic fibers, and is characterized in that it comprises a plurality of drive rollers fixed to a drive shaft that is driven to rotate, and a plurality of driven rollers that receive rotational power from the drive rollers by contacting the circumferential surfaces of the drive rollers, and each driven roller has a power receiving section that contacts the circumferential surface of the drive roller formed on a part of its axial direction, and a yarn feeding section that does not contact the circumferential surface of the drive roller formed on a part of its axial direction, and the yarn is wound around the yarn feeding section.

[0008] In the present invention, since multiple drive rollers are fixed to the shaft, a single drive source for driving the shaft to rotate the multiple drive rollers is sufficient. This reduces costs. The driven roller is formed with a power receiving portion that contacts the circumferential surface of the drive roller and a yarn sending portion that does not contact the circumferential surface of the drive roller. The driven roller receives the rotational power of the drive roller at the power receiving portion and rotates, thereby sending the yarn wound around the yarn sending portion downstream in the yarn running direction. While it is necessary to maintain an appropriate contact state between the drive roller and the power receiving portion of the driven roller, since the yarn is not sandwiched between the drive roller and the driven roller and sent, strict adjustment is not required as with a nip roller-type yarn sending device, and the burden of maintenance work can be reduced. As described above, the present invention reduces the burden of maintenance work and reduces costs.

[0009] In the present invention, one of the drive roller and the driven roller has a large diameter portion and a small diameter portion having an outer diameter smaller than that of the large diameter portion, and the large diameter portion contacts the peripheral surface of the other of the drive roller and the driven roller.

[0010] With this configuration, a space is created between the circumferential surface of the small diameter portion of one roller and the portion of the circumferential surface of the other roller that faces the small diameter portion. Therefore, by winding the yarn around either the circumferential surface of the small diameter portion of one roller or the portion of the circumferential surface of the other roller that faces the small diameter portion, the yarn can be fed by utilizing the holding force created by the frictional force generated by the wound yarn, without being pinched between the two rollers.

[0011] In the present invention, the axial dimension of the small diameter portion may be greater than the axial dimension of the large diameter portion.

[0012] With this configuration, a large area can be secured around which the thread can be wound, making threading easier.

[0013] In the present invention, the large diameter portion of the one roller may be detachable from the small diameter portion.

[0014] When the large diameter portion of one roller wears due to contact with the other roller, the rotation speed of the driven roller changes, which in turn changes the yarn feed speed. With the above-described configuration, if the large diameter portion wears, simply replacing it can prevent the yarn feed speed from changing.

[0015] In the present invention, it is preferable that at least a part of the small diameter portion formed on the one roller faces the circumferential surface of the other roller.

[0016] For example, for thick yarns, a nip roller-type yarn feeding device is more likely to feed the yarn stably. The optimal type of yarn feeding device varies depending on the type of yarn. With the above-described configuration, by removing the large-diameter portion from the small-diameter portion, the device can be used as a nip roller-type yarn feeding device, which sandwiches and feeds the yarn between the small-diameter portion and the other roller. Therefore, a yarn feeding device suitable for various types of yarn can be provided. Furthermore, by removing only the large-diameter portions of some of the rollers from the small-diameter portion, it becomes possible to simultaneously feed multiple types of yarns with a single yarn feeding device.

[0017] In the present invention, the driven roller may be formed with the large diameter portion and the small diameter portion, the large diameter portion functioning as the power receiving portion, and the small diameter portion functioning as the yarn sending portion.

[0018] With this configuration, the step between the large diameter portion and the small diameter portion prevents the yarn wound around the small diameter portion from moving to the large diameter portion, thereby preventing the yarn from being unintentionally pinched between the large diameter portion and the drive roller.

[0019] In the present invention, each of the plurality of driven rollers is provided with a fixed shaft that rotatably supports the driven roller and a support member that supports the fixed shaft, and the fixed shaft is fixed to the support member and is detachable from the support member.

[0020] With this configuration, the fixed shaft can be removed from the support member together with the driven roller, making it easy to replace the driven roller.

[0021] In the present invention, it is preferable that each of the plurality of driven rollers has both the large diameter portion and the small diameter portion.

[0022] This configuration reduces the space required to install a unit including the driven roller, fixed shaft, and support member compared to when the large diameter portion and small diameter portion are formed on separate driven rollers. Also, by removing the fixed shaft from the support member together with the driven roller, the large diameter portion and small diameter portion can be removed at the same time.

[0023] In the present invention, the driven roller has a configuration in which a ring-shaped member is attached to the circumferential surface of a cylindrical roller body, and the portion to which the ring-shaped member is attached functions as the large diameter portion, and the portion of the roller body to which the ring-shaped member is not attached functions as the small diameter portion.

[0024] With this configuration, if the large diameter portion becomes worn, for example, it is easy to replace the large diameter portion by simply removing the old ring-shaped member from the roller body and fitting a new ring member into the roller body.

[0025] In the present invention, the large diameter portion may be configured to have a central portion and an outer peripheral portion that is detachable from the peripheral surface of the central portion.

[0026] With this configuration, for example, when the large diameter portion wears out, only the outer periphery portion needs to be replaced instead of the entire large diameter portion, which makes it possible to reduce operating costs.

[0027] In the present invention, the driven roller may have the large diameter portion attached to an end surface of the small diameter portion.

[0028] If the large diameter portion is made of a ring-shaped member as described above, the strength of the ring-shaped member may be insufficient and the ring-shaped member may be prone to breakage. In contrast, if the large diameter portion is attached to the end face of the small diameter portion, the large diameter portion can be made disk-shaped, which increases the strength.

[0029] In the present invention, it is preferable that each of the plurality of driven rollers is individually replaceable with a cylindrical roller having a uniform outer diameter.

[0030] With this configuration, the driven roller can be replaced with one that feeds the yarn using its small diameter portion without pinching it, or one that feeds the yarn by pinching it between itself and the drive roller, making it possible to provide a yarn feeding device suitable for a variety of yarn types.Furthermore, by replacing only some of the multiple driven rollers with cylindrical rollers with a uniform outer diameter, it becomes possible to simultaneously feed multiple types of yarn with a single yarn feeding device.

[0031] In the present invention, the axial dimension of the driven roller is larger than the axial dimension of the drive roller, and a portion of the driven roller that comes into contact with the circumferential surface of the drive roller functions as the power receiving portion, and a portion of the driven roller that does not come into contact with the circumferential surface of the drive roller functions as the yarn feeding portion.

[0032] According to this configuration, both the driven roller and the drive roller can be cylindrical, so the configuration can be simpler than when one of the rollers is provided with a large diameter portion and a small diameter portion.

[0033] In the present invention, the peripheral surface of the yarn feeding section may be made of metal.

[0034] If the circumferential surface of the yarn feeding part wears due to friction with the yarn, the yarn may be damaged or the yarn may not be fed properly. If the circumferential surface of the yarn feeding part is made of metal, it is preferable because wear of the circumferential surface of the yarn feeding part can be suppressed.

[0035] In the present invention, the peripheral surface of the power receiving portion may be made of a material having a higher coefficient of friction than the peripheral surface of the yarn sending portion.

[0036] With this configuration, the power receiving portion, which is in contact with the circumferential surface of the drive roller, can more reliably receive the rotational power from the drive roller.

[0037] In the present invention, it is preferable to provide a detector for detecting the number of rotations of the driven roller.

[0038] When rotational power is transmitted by contact between a drive roller and a driven roller, there is a risk that the rotation speed of the driven roller will change due to wear. Therefore, by providing a detector to detect the rotation speed of the driven roller, it is possible to grasp the change in the rotation speed of the driven roller and take appropriate measures.

[0039] In the present invention, each of the plurality of driven rollers may be provided with a moving mechanism that moves the driven roller between a contact position where the driven roller contacts the circumferential surface of the drive roller and a separation position where the driven roller is separated from the drive roller.

[0040] With this configuration, for example, if a certain yarn breaks, the broken yarn can be dealt with by moving only the driven roller that has been feeding the broken yarn away from the drive roller.

[0041] In the present invention, a separate roller may be provided in the vicinity of the driven roller, and the yarn may be wound around the yarn feeding section and the separate roller.

[0042] With this configuration, the yarn can be more reliably fed by the yarn feeding section.

[0043] In the present invention, it is preferable that the number of the plurality of drive rollers is the same as the number of the plurality of driven rollers.

[0044] By providing the same number of drive rollers as driven rollers in this way, the axial dimension of each drive roller can be smaller than, for example, when two driven rollers are provided for one drive roller. This reduces the total weight of all drive rollers, making it possible to rotate multiple drive rollers with less power. Furthermore, in order to maintain appropriate contact between the drive rollers and driven rollers, it is preferable to provide a one-to-one ratio of drive rollers to driven rollers.

[0045] The axial direction of the plurality of drive rollers may be parallel to the direction in which the plurality of drive rollers are arranged.

[0046] When arranging conventional godet rollers with motors, it is common to arrange them so that their axial direction is perpendicular to the direction in which the godet rollers are arranged, thereby saving space in the direction in which the godet rollers are arranged. However, even with this arrangement, space is still required in proportion to the diameter of the godet roller or the size of the motor. On the other hand, the present invention does not require motors to individually drive multiple drive rollers, making the above-mentioned arrangement possible and achieving space savings.

[0047] A false twisting machine according to the present invention includes any one of the yarn feeding devices described above, and is characterized in that it applies false twisting to a plurality of yarns fed by the yarn feeding device.

[0048] As described above, such a false twisting machine can reduce the burden of maintenance work on the yarn feeding device and can also reduce costs. [Brief explanation of the drawings]

[0049] [Figure 1] 1 is a schematic diagram showing the configuration of a false twisting machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing a part of a yarn feeding device. [Figure 3] FIG. 2 is a schematic diagram showing a separation roller. [Figure 4]FIG. 10 is a schematic diagram showing a state in which the driven roller is replaced with a cylindrical roller. [Figure 5] FIG. 10 is a schematic view showing a part of a yarn sending device according to a first modified example. [Figure 6] FIG. 10 is a schematic view showing a part of a yarn sending device according to a second modified example. [Figure 7] FIG. 10 is a schematic view showing a part of a yarn sending device according to a third modified example. [Figure 8] FIG. 10 is a schematic view showing a part of a yarn sending device according to a fourth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0050] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0051] (Overall configuration of false twisting machine) FIG. 1 is a schematic diagram showing the configuration of a false twisting machine 1 (corresponding to the yarn processing machine of the present invention) according to this embodiment. The false twisting machine 1 includes a yarn supplying section 2 that supplies multiple yarns Y made of synthetic fibers, a processing section 3 (corresponding to the crimping section of the present invention) that performs false twisting (a type of crimping process of the present invention) on the multiple yarns Y supplied from the yarn supplying section 2, and a winding section 4 that winds up the multiple yarns Y that have been false twisted in the processing section 3 to form multiple packages P. The processing section 3 includes multiple processing units 10 (also called spindles) that perform false twisting on the yarns Y, arranged in a direction perpendicular to the plane of the paper in FIG. 1. This allows multiple yarns Y that are running aligned in a direction perpendicular to the plane of the paper in FIG. 1 to be false twisted simultaneously.

[0052] The yarn supplying section 2 supplies multiple yarns Y from a yarn supply package Q to the processing section 3. The processing section 3 applies false twisting to the multiple yarns Y traveling along a yarn path. Each processing unit 10 constituting the processing section 3 includes, in order from upstream in the yarn traveling direction, a first feed roller 11, a twist stop guide 12, a first heating device 13, a cooling device 14, a false twisting device 15, a second feed roller 16, an intertwining device 17, a third feed roller 18, a second heating device 19, and a fourth feed roller 20, which are arranged along the yarn path. The winding section 4 winds the multiple yarns Y false twisted in the processing section 3 with a winding device 21 to form multiple packages P.

[0053] The false twisting machine 1 has a main machine base 5 and a winding table 6 that are arranged at a distance from each other in the left-right direction of Fig. 1. The main machine base 5 and the winding table 6 extend in a direction perpendicular to the plane of Fig. 1 and are arranged opposite each other. The upper part of the main machine base 5 and the upper part of the winding table 6 are connected by a support frame 7. The devices that make up the processing section 3 are mainly attached to the main machine base 5 and the support frame 7. The work space 8 surrounded by the main machine base 5, the winding table 6, and the support frame 7 is a space where the operator performs various tasks such as threading.

[0054] (Processing department) The first feed roller 11 is disposed above the winding table 6 and feeds the yarn Y supplied from the yarn supplying section 2 toward the first heating device 13.

[0055] The twist stop guide 12 is disposed downstream in the yarn running direction of the first feed roller 11 and upstream in the yarn running direction of the first heating device 13. The twist stop guide 12 prevents the twist imparted to the yarn Y by the false twist device 15, which will be described later, from propagating upstream of the twist stop guide 12 in the yarn running direction.

[0056] The first heating device 13 is disposed on the support frame 7 and heats the yarn Y fed from the first feed roller 11.

[0057] The cooling device 14 is disposed downstream of the first heating device 13 in the yarn running direction and upstream of the false twist device 15 in the yarn running direction, and cools the yarn Y heated by the first heating device 13.

[0058] The false twist device 15 is disposed above the main machine base 5 and applies twist to the yarn Y. There are various types of false twist devices 15, such as belt type, friction disk type, and pin type, but the type of false twist device 15 is not limited in this embodiment.

[0059] The second feed roller 16 is disposed below the false twist device 15 on the main machine base 5, and sends the yarn Y to which twist has been imparted by the false twist device 15 toward the intertwining device 17. The conveying speed of the yarn Y by the second feed roller 16 is faster than the conveying speed of the yarn Y by the first feed roller 11. Therefore, the yarn Y is stretched between the first feed roller 11 and the second feed roller 16.

[0060] The intertwining device 17 is disposed below the second feed roller 16 on the main machine base 5, and intertwines the yarn Y.

[0061] The third feed roller 18 is disposed below the intertwining device 17 on the main machine base 5, and sends the yarn Y that has been entangled by the intertwining device 17 toward the second heating device 19. The conveying speed of the yarn Y by the third feed roller 18 is slower than the conveying speed of the yarn Y by the second feed roller 16. Therefore, the yarn Y is relaxed between the second feed roller 16 and the third feed roller 18.

[0062] The second heating device 19 is disposed below the third feed roller 18 on the main machine base 5, and heats the yarn Y fed from the third feed roller 18.

[0063] The fourth feed roller 20 is disposed below the winding table 6 and sends the yarn Y that has been heat-treated by the second heating device 19 toward the winding device 21. The conveying speed of the yarn Y by the fourth feed roller 20 is slower than the conveying speed of the yarn Y by the third feed roller 18. Therefore, the yarn Y is relaxed between the third feed roller 18 and the fourth feed roller 20.

[0064] In the processing section 3 configured as described above, the yarn Y drawn between the first feed roller 11 and the second feed roller 16 is twisted by the false twist device 15. The twist formed by the false twist device 15 propagates up to the twist stop guide 12, but does not propagate upstream of the twist stop guide 12 in the yarn running direction. The yarn Y to which twist has been imparted while being drawn is heated by the first heating device 13 and then cooled and heat-set by the cooling device 14. After passing through the false twist device 15, the twisted yarn Y is untwisted before reaching the second feed roller 16. However, because the twist of the yarn Y has been heat-set as described above, each filament maintains its wavy false twisted state.

[0065] Furthermore, the yarn Y is entangled by an entanglement device 17 while being relaxed between a second feed roller 16 and a third feed roller 18. The entangled yarn Y is heat-set by a second heating device 19 while being relaxed between a third feed roller 18 and a fourth feed roller 20. Finally, the yarn Y sent from the fourth feed roller 20 is wound by a winding device 21 to form a package P.

[0066] (Yarn feeding device) 2 is a schematic diagram showing a part of the yarn feeding device 30. The yarn feeding device 30 is applied to some or all of the first feed roller 11, the second feed roller 16, the third feed roller 18, and the fourth feed roller 20. The yarn feeding device 30 is configured with a drive shaft 31, a motor 32, a plurality of drive rollers 33, and a plurality of driven rollers 34.

[0067] The drive shaft 31 extends in a direction perpendicular to the plane of the paper in FIG. 1, i.e., in the direction in which the multiple yarns Y are arranged in the processing unit 3. The drive shaft 31 is driven to rotate around its axis by a motor 32. A multiple number of drive rollers 33 are fixed to the drive shaft 31 at equal intervals in the axial direction of the drive shaft 31 (hereinafter simply referred to as the axial direction). When the drive shaft 31 is driven to rotate by the motor 32, the multiple drive rollers 33 rotate in unison. The drive rollers 33 are cylindrical rollers with a uniform outer diameter and are made of metal. However, the drive rollers 33 may be made of a material other than metal.

[0068] The number of driven rollers 34 is the same as the number of drive rollers 33. The multiple driven rollers 34 are arranged at equal intervals in the axial direction so as to face the corresponding drive rollers 33. However, the number of drive rollers 33 and the number of driven rollers 34 do not necessarily have to be the same. For example, multiple driven rollers 34 may be provided for one drive roller 33 with a large axial dimension. Each driven roller 34 is provided with a lever mechanism 37 (corresponding to the moving mechanism of the present invention). Each driven roller 34 is attached to a machine base (not shown) via a support member 37a of the lever mechanism 37. Each driven roller 34 is provided with a detector 38 that detects the number of rotations of the driven roller 34. However, the detector 38 may be omitted, or the detector 38 may be provided only for some of the driven rollers 34.

[0069] The lever mechanism 37 can move the driven roller 34 between a contact position (position shown in FIG. 2A) where the driven roller 34 (specifically, the large diameter portion 35) contacts the circumferential surface of the drive roller 33, and a separation position (position shown in FIG. 2B) where the driven roller 34 (specifically, the large diameter portion 35) is separated from the circumferential surface of the drive roller 33. The lever mechanism 37 incorporates a biasing member (e.g., a spring) (not shown) that biases the driven roller 34 toward the drive roller 33, and is adjusted so that the driven roller 34 contacts the drive roller 33 with an appropriate contact pressure.

[0070] Each driven roller 34 is provided with a fixed shaft 34a that rotatably supports the driven roller 34. The fixed shaft 34a is parallel to the drive shaft 31. A bearing (not shown) is disposed between the driven roller 34 and the fixed shaft 34a. The fixed shaft 34a is fixed to a support member 37a of the lever mechanism 37 by a fixing mechanism. The fixed shaft 34a can be removed from the support member 37a (lever mechanism 37) by releasing the fixing mechanism. That is, the fixed shaft 34a is detachable from the support member 37a. The fixed shaft 34a does not rotate when attached to the support member 37a. The fixed shaft 34a can be removed from the support member 37a together with the driven roller 34. The fixing mechanism is, for example, a bolt 80. That is, the fixed shaft 34a can be removed from the support member 37a by loosening the bolt 80. The driven roller 34 shown in FIG. 2 can be replaced with a cylindrical roller 39 with a uniform outer diameter shown in FIG. 4. The driven roller 34 may be fixed to a shaft rotatably supported by the support member 37a.

[0071] The fixed shaft 34a can be removed from the support member 37a by pulling it out in the axial direction from the support member 37a. Therefore, when installing a unit including the driven roller 34, the fixed shaft 34a, and the lever mechanism 37, in addition to the space occupied by these units, a space is also required for pulling the fixed shaft 34a out of the support member 37a when removing the fixed shaft 34a from the support member 37a.

[0072] The mechanism for moving the driven roller 34 is not limited to the lever mechanism 37, and other mechanisms may be used. In this embodiment, threading is possible even in the state shown in Figure 2a, so there is no need to operate the lever mechanism 37 during threading. The lever mechanism 37 is mainly used to move the driven roller 34 away from the drive roller 33 when production is stopped or when an abnormality such as a malfunction or thread breakage occurs.

[0073] The driven roller 34 has a stepped circumferential surface and includes a large diameter portion 35 (corresponding to the power receiving portion of the present invention) and a small diameter portion 36 (corresponding to the yarn feeding portion of the present invention) having an outer diameter smaller than that of the large diameter portion 35. That is, each driven roller 34 is formed with both the large diameter portion 35 and the small diameter portion 36. The large diameter portion 35 contacts the circumferential surface of the drive roller 33 when the driven roller 34 is in the contact position, and receives rotational power from the drive roller 33. The small diameter portion 36 faces the circumferential surface of the drive roller 33. The facing direction of the small diameter portion 36 and the drive roller 33 is perpendicular to the axial direction. In this embodiment, the small diameter portion 36 faces the circumferential surface of the drive roller 33 over the entire axial direction. It is sufficient that at least a portion of the small diameter portion 36 faces the circumferential surface of the drive roller 33 in the axial direction. Note that as long as the large diameter portion 35 faces the circumferential surface of the drive roller 33, the small diameter portion 36 does not have to face the circumferential surface of the drive roller 33. The small diameter portion 36 does not come into contact with the circumferential surface of the drive roller 33 even when the driven roller 34 is in the contact position, and a space is secured between the circumferential surface of the small diameter portion 36 and the circumferential surface of the drive roller 33 .

[0074] The large diameter portion 35 and the small diameter portion 36 may be formed on separate driven rollers 34. In this case, the driven roller 34 is fixed to a shaft that is rotatably supported by a support member 37a. The rotational power received by the large diameter portion 35 is transmitted to the small diameter portion 36 via the shaft.

[0075] FIG. 3 is a schematic diagram showing the separating roller 71, viewed from the right side (one side in the axial direction) of FIG. 2. The separating roller 71 is disposed near the driven roller 34. The yarn Y is wound multiple times between the small-diameter portion 36 of the driven roller 34 and the separating roller 71. The rotation axis of the separating roller 71 is slightly tilted with respect to the rotation axis of the driven roller 34 so that the yarn Y does not overlap even when wound multiple times. If multiple grooves or multiple protrusions that can hold the yarn Y without overlapping are formed on the circumferential surfaces of the separating roller 71 and / or the small-diameter portion 36, the rotation axis of the separating roller 71 may be parallel to the rotation axis of the driven roller 34. The multiple grooves or multiple protrusions formed on the circumferential surfaces of the separating roller 71 and / or the small-diameter portion 36 may be parallel to each other. Although the separating roller 71 of this embodiment is configured to rotate drivenly, the separating roller 71 may also be fixed. It should be noted that providing the separate roller 71 is not essential, and for example, a guide may be provided instead of the separate roller 71. Furthermore, even without using the separate roller 71 or a guide, if a spiral groove is formed on the circumferential surface of the small diameter portion 36, the yarn Y can be wound multiple times along the spiral groove without overlapping, thereby preventing yarn slippage.

[0076] The axial dimension of the small-diameter portion 36 is larger than the axial dimension of the large-diameter portion 35. The large-diameter portion 35 is attached to the end face of the small-diameter portion 36, for example, with bolts or the like, and the large-diameter portion 35 is detachable from the small-diameter portion 36. The large-diameter portion 35 is made of rubber and has a disk shape. The small-diameter portion 36 is made of metal and has a cylindrical shape. The circumferential surface of the small-diameter portion 36 may be mirror-finished or matte-finished. The coefficient of friction of the circumferential surface of the large-diameter portion 35 is larger than the coefficient of friction of the circumferential surface of the small-diameter portion 36, making it suitable for contacting the circumferential surface of the drive roller 33 and receiving rotational power. However, the circumferential surface of the large-diameter portion 35 may be made of a material other than rubber, or the circumferential surface of the small-diameter portion 36 may be made of a material other than metal that is less prone to wear. It is not essential that the coefficient of friction of the circumferential surface of the large-diameter portion 35 be larger than the coefficient of friction of the circumferential surface of the small-diameter portion 36. Furthermore, the large-diameter portion 35 does not have to be detachable from the small-diameter portion 36.

[0077] In the yarn feeding device 30 having the above configuration, when the drive shaft 31 is rotationally driven by the motor 32, the multiple drive rollers 33 rotate in unison, and rotational power is transmitted from each drive roller 33 to the large diameter portion 35 of the corresponding driven roller 34. This causes the multiple driven rollers 34 to rotate, and the yarn Y wound around the small diameter portion 36 of each driven roller 34 is fed.

[0078] (effect) In the yarn feeding device 30 of this embodiment, multiple drive rollers 33 are fixed to the drive shaft 31. Therefore, a single motor 32 (drive source) that rotates the drive shaft 31 is sufficient to rotate the multiple drive rollers 33. This reduces costs. The driven roller 34 is formed with a power receiving portion (large diameter portion 35) that comes into contact with the circumferential surface of the drive roller 33, and a yarn feeding portion (small diameter portion 36) that does not come into contact with the circumferential surface of the drive roller 33. The driven roller 34 receives the rotational power of the drive roller 33 at the power receiving portion 35 and rotates, thereby feeding the yarn Y wound around the yarn feeding portion 36. While it is necessary to maintain an appropriate contact state between the drive roller 33 and the power receiving portion 35 of the driven roller 34, the yarn Y is not sandwiched between the drive roller 33 and the driven roller 34 for feeding, so that strict adjustment is not required as with a nip roller-type yarn feeding device, and the maintenance burden can be reduced. Therefore, by using the yarn feeding device 30, it is possible to reduce the burden of maintenance work and also to keep costs down.

[0079] In this embodiment, one of the drive roller 33 and the driven roller 34 (the driven roller 34) is formed with a large diameter portion 35 and a small diameter portion 36 having an outer diameter smaller than that of the large diameter portion 35, and the large diameter portion 35 contacts the circumferential surface of the other of the drive roller 33 and the driven roller 34 (the drive roller 33). With this configuration, a space is formed between the circumferential surface of the small diameter portion 36 of one roller 34 and a portion of the circumferential surface of the other roller 33 that faces the small diameter portion 36. Therefore, if the yarn Y is wound around either the circumferential surface of the small diameter portion 36 of one roller 34 or the portion of the circumferential surface of the other roller 33 that faces the small diameter portion 36, the yarn Y can be fed by utilizing the holding force due to the frictional force generated by the wound yarn Y, without pinching the yarn Y between the two rollers 33 and 34.

[0080] In this embodiment, the axial dimension of the small diameter portion 36 is larger than the axial dimension of the large diameter portion 35. With this configuration, a large area can be secured around which the thread Y can be wound, making threading easier.

[0081] In this embodiment, one roller (driven roller 34) is configured such that the large diameter portion 35 is detachable from the small diameter portion 36. When the large diameter portion 35 wears due to contact with the other roller (drive roller 33), the rotation speed of the driven roller 34 changes, and the feed speed of the yarn Y changes. With the above-described configuration, if the large diameter portion 35 wears, simply replacing it can prevent the feed speed of the yarn Y from changing. Note that, when the large diameter portion 35 is made of a resin such as rubber, as in this embodiment, the feed speed of the yarn Y may be adjusted by polishing the surface of the large diameter portion 35.

[0082] In this embodiment, the small diameter portion 36 formed on one roller (the driven roller 34) faces the circumferential surface of the other roller (the drive roller 33). For example, for thick yarns, a nip roller-type yarn feeding device is more likely to feed the yarn stably. The optimal type of yarn feeding device varies depending on the type of yarn. With the above-described configuration, by removing the large diameter portion 35 from the small diameter portion 36, the device can be used as a nip roller-type yarn feeding device that sandwiches and feeds the yarn between the small diameter portion 36 and the other roller 33. This makes it possible to provide a yarn feeding device suitable for a variety of yarn types. Furthermore, by removing only the large diameter portions 35 of some of the rollers 34 from the small diameter portions 36, it becomes possible to simultaneously feed multiple types of yarn using a single yarn feeding device.

[0083] In this embodiment, the driven roller 34 is formed with a large diameter portion 35 and a small diameter portion 36, with the large diameter portion 35 functioning as a power receiving portion and the small diameter portion 36 functioning as a yarn feeding portion. With this configuration, there is a step between the large diameter portion 35 and the small diameter portion 36, which prevents the yarn Y wound around the small diameter portion 36 from moving to the large diameter portion 35. This prevents the yarn Y from being unintentionally pinched between the large diameter portion 35 and the drive roller 33.

[0084] In this embodiment, each of the multiple driven rollers 34 is provided with a fixed shaft 34a that rotatably supports the driven roller 34 and a support member 37a that supports the fixed shaft 34a. The fixed shaft 34a is fixed to the support member 37a and is detachable from the support member 37a. With this configuration, the driven roller 34 can be easily replaced by removing the fixed shaft 34a together with the driven roller 34 from the support member 37a.

[0085] In this embodiment, each of the multiple driven rollers 34 is formed with both a large diameter portion 35 and a small diameter portion 36. With this configuration, the space required to install a unit including the driven rollers 34, fixed shaft 34a, and support member 37a can be reduced compared to when the large diameter portion 35 and the small diameter portion 36 are formed on separate driven rollers 34. Furthermore, by removing the fixed shaft 34a together with the driven rollers 34 from the support member 37a, the large diameter portion 35 and the small diameter portion 36 can be removed at the same time.

[0086] In this embodiment, the large diameter portion 35 is attached to the end face of the small diameter portion 36. As in the modified example described below, the large diameter portion 35 can be configured as a ring-shaped member, but the ring-shaped member may not be strong enough and may be prone to breakage. In this regard, if the large diameter portion 35 is configured to be attached to the end face of the small diameter portion 36, the large diameter portion 35 can be made disk-shaped, thereby increasing its strength.

[0087] In this embodiment, each of the multiple driven rollers 34 can be individually replaced with a cylindrical roller 39 with a uniform outer diameter (see FIG. 4). For example, when the yarn Y is thick, a nip roller-type yarn feeding device is more likely to feed the yarn stably. The optimal type of yarn feeding device varies depending on the yarn type. If the driven roller 34 can be replaced with a type that feeds the yarn Y using the small diameter portion 36 without sandwiching it, or a type that feeds the yarn Y by sandwiching it between the driven roller 34 and the drive roller 33, a yarn feeding device 30 suitable for a variety of yarn types can be provided. Furthermore, if only some of the multiple driven rollers 34 are replaced with cylindrical rollers 39 with a uniform outer diameter, multiple types of yarn Y can be fed simultaneously using a single yarn feeding device 30.

[0088] In this embodiment, the circumferential surface of the yarn feeding section 36 is made of metal. If the circumferential surface of the yarn feeding section 36 wears due to friction with the yarn Y, it may damage the yarn Y or prevent proper yarn feeding. Making the circumferential surface of the yarn feeding section 36 out of metal is preferable because it can prevent the circumferential surface of the yarn feeding section 36 from wearing down.

[0089] In this embodiment, the circumferential surface of the power receiving part 35 is made of a material having a higher friction coefficient than the circumferential surface of the yarn sending part 36. With this configuration, the power receiving part 35, which is in contact with the circumferential surface of the drive roller 33, can more reliably receive rotational power from the drive roller 33.

[0090] In this embodiment, a detector 38 is provided that detects the rotation speed of the driven roller 34. When rotational power is transmitted by contact between the drive roller 33 and the driven roller 34, there is a risk that the rotation speed will change due to wear of the driven roller 34. Therefore, by providing the detector 38 that detects the rotation speed of the driven roller 34, it becomes possible to grasp the change in the rotation speed of the driven roller 34 and take appropriate measures.

[0091] In this embodiment, each of the multiple driven rollers 34 is provided with a lever mechanism 37 (moving mechanism) that moves the driven roller 34 between a contact position where the driven roller 34 contacts the circumferential surface of the drive roller 33 and a separation position where the driven roller 34 is separated from the drive roller 33. With this configuration, for example, if a certain yarn Y breaks, it is possible to address the yarn breakage by separating only the driven roller 34 that was feeding the broken yarn Y from the drive roller 33.

[0092] In this embodiment, a separate roller 71 is provided near the driven roller 34, and the yarn Y is wound around the yarn feeding section 36 and the separate roller 71. With this configuration, the yarn can be more reliably fed by the yarn feeding section.

[0093] In this embodiment, the number of the plurality of drive rollers 33 is the same as the number of the plurality of driven rollers 34. By providing the same number of drive rollers 33 as the driven rollers 34 in this way, the axial dimension of each drive roller 33 can be smaller than, for example, when two driven rollers 34 are provided for one drive roller 33. This allows the total weight of all the drive rollers 33 to be reduced, making it possible to rotate the plurality of drive rollers 33 with less power. Furthermore, in order to maintain appropriate contact between the drive rollers 33 and the driven rollers 34, it is preferable to provide a one-to-one relationship between the drive rollers 33 and the driven rollers 34.

[0094] In this embodiment, the axial direction of the multiple drive rollers 33 is parallel to the direction in which the multiple drive rollers 33 are lined up. When arranging conventional godet rollers with motors, it is common to arrange the godet rollers so that their axial direction is perpendicular to the direction in which the godet rollers are lined up, thereby saving space in the direction in which the godet rollers are lined up. However, even with this arrangement, space is still required in proportion to the diameter of the godet roller or the size of the motor. On the other hand, in this embodiment, a motor for individually driving the multiple drive rollers 33 is not required, making the above-described arrangement possible and realizing space savings.

[0095] (Other embodiments) Modifications of the present invention will be described below. Note that in each modification, the description of the configurations and effects common to the above embodiment will be omitted.

[0096] 5 is a schematic diagram showing a part of a yarn sending device 46 according to a first modified example. In the above embodiment, the large diameter portion 35 of the driven roller 34 is configured as a single member. However, as in this modified example, the large diameter portion 47 of the driven roller 34 may be configured by dividing it into a central portion 48 and an outer peripheral portion 49 that is detachable from the circumferential surface of the central portion 48. With such a configuration, for example, when the large diameter portion 47 wears, it is only necessary to replace the outer peripheral portion 49, not the entire large diameter portion 47, which makes it possible to reduce operating costs.

[0097] FIG. 6 is a schematic diagram showing a portion of a yarn sending device 40 according to a second modified example. In the above embodiment, the large-diameter portion 35 of the driven roller 34 is attached to the end surface of the small-diameter portion 36. However, as in this modified example, the driven roller 41 may be configured such that a ring-shaped member 43 is attached to the circumferential surface of a cylindrical roller body 42. The ring-shaped member 43 is preferably made of an elastic material such as rubber. In this case, the portion to which the ring-shaped member 43 is attached functions as the large-diameter portion 44 (power receiving portion), and the portion of the roller body 42 to which the ring-shaped member 43 is not attached functions as the small-diameter portion 45 (yarn sending portion). With this configuration, for example, if the large-diameter portion 44 wears out, it is easy to replace the large-diameter portion 44 by simply removing the old ring-shaped member 43 from the roller body 42 and fitting a new ring-shaped member 43 into the roller body 42.

[0098] FIG. 7 is a schematic diagram showing a portion of a yarn feeding device 50 according to a third modified example. In the above embodiment, the driven roller 34 is configured to have a large diameter portion 35 and a small diameter portion 36. However, as in this modified example, the drive roller 51 may be configured to have a large diameter portion 52 and a small diameter portion 53, and the driven roller 54 may be configured as a cylindrical roller with a uniform outer diameter. In this case, the portion of the driven roller 54 that contacts the circumferential surface of the large diameter portion 52 of the drive roller 51 functions as the power receiving portion 55, and the portion of the driven roller 54 that does not contact the circumferential surface of the large diameter portion 52 functions as the yarn feeding portion 56. To suppress wear due to friction with the yarn Y, the circumferential surface of the driven roller 54 is preferably made of metal, but any material that is less susceptible to wear may be used. Furthermore, to ensure reliable transmission of rotational power from the drive roller 51 to the driven roller 54, it is preferable that at least the circumferential surface of the large diameter portion 52 of the drive roller 51 is made of a material with a high friction coefficient, such as rubber. However, the materials constituting the drive roller 51 and the driven roller 54 can be changed as appropriate.

[0099] FIG. 8 is a schematic diagram showing a part of a yarn sending device 60 according to a fourth modified example. In the above embodiment, the driven roller 34 is configured to have a large diameter portion 35 and a small diameter portion 36. However, as in this modified example, the axial dimension of the driven roller 62 may be larger than the axial dimension of the drive roller 61, and neither the drive roller 61 nor the driven roller 62 may be provided with a large diameter portion or a small diameter portion. In this case, the portion of the driven roller 62 that contacts the circumferential surface of the drive roller 61 functions as the power receiving portion 63, and the portion of the driven roller 62 that does not contact the circumferential surface of the drive roller 61 functions as the yarn sending portion 64. With this configuration, both the driven roller 62 and the drive roller 61 can be cylindrical, thereby simplifying the configuration compared to when one of the rollers is provided with a large diameter portion and a small diameter portion.

[0100] In the above embodiment, only the driven roller 34 is provided with the large diameter portion 35 and the small diameter portion 36. However, not only the driven roller 34 but also the drive roller 33 may be provided with large diameter portions and small diameter portions.

[0101] In the above embodiment, gears or anti-slip mechanisms (for example, grooves) may be formed on the circumferential surface of the drive roller 33 and the circumferential surface of the large diameter portion 35 of the driven roller 34 to more reliably transmit rotational power.

[0102] In the above embodiment, the yarn feeding device 30 is applied to the false twisting machine 1. However, the yarn feeding device 30 may also be applied to other yarn processing machines that apply crimping to yarn made of synthetic fibers. [Explanation of symbols]

[0103] 1: False twisting machine (yarn processing machine) 3: Processing section (crimping section) 30, 40, 46, 50, 60: Yarn feeding device 31: Drive shaft 33, 51, 61: Drive rollers 34, 41, 54, 62: Driven rollers 34a: Fixed shaft 35, 44, 47: Large diameter section (power receiving section) 36, 45: Small diameter section (thread feeding section) 37: Lever mechanism (movement mechanism) 37a: Support member 38: Detector 42: Roller body 43: Ring-shaped member 48: Center 49: Outer periphery 52: Large diameter section 53: Small diameter section 55, 63: Power receiving section 56, 64: Yarn feeding section 71: Separate roller Y: Thread

Claims

1. A yarn feeding device provided in a yarn processing machine having a crimping unit that crimps a yarn made of synthetic fiber, a plurality of drive rollers fixed to a drive shaft that is driven to rotate; a plurality of driven rollers that contact peripheral surfaces of the plurality of drive rollers to receive rotational power from the plurality of drive rollers and rotate; Equipped with the driven roller has a power receiving portion formed in a part of its axial direction, the power receiving portion being in contact with the circumferential surface of the drive roller, and a yarn feeding portion formed in a part of its axial direction, the power receiving portion not in contact with the circumferential surface of the drive roller, and the yarn is wound around the yarn feeding portion.

2. One of the drive roller and the driven roller has a large diameter portion and a small diameter portion having an outer diameter smaller than that of the large diameter portion, The yarn sending device according to claim 1, wherein the large diameter portion contacts the peripheral surface of the other of the drive roller and the driven roller.

3. The yarn feeding device according to claim 2, wherein the axial dimension of the small diameter portion is greater than the axial dimension of the large diameter portion.

4. The yarn sending device according to claim 2, wherein the large diameter portion of the one roller is detachable from the small diameter portion.

5. A yarn feeding device as described in Claim 3, characterized in that the large diameter portion of one of the rollers is detachable from the small diameter portion.

6. The yarn sending device according to claim 4, wherein at least a part of the small diameter portion formed on the one roller faces a peripheral surface of the other roller.

7. A yarn feeding device as described in Claim 5, characterized in that at least a portion of the small diameter portion formed on one of the rollers faces the peripheral surface of the other roller.

8. The yarn feeding device according to claim 2, wherein the driven roller is formed with the large diameter portion and the small diameter portion, the large diameter portion functions as the power receiving portion, and the small diameter portion functions as the yarn feeding portion.

9. A yarn feeding device as described in claim 3, characterized in that the large diameter portion and the small diameter portion are formed on the driven roller, the large diameter portion functions as the power receiving portion, and the small diameter portion functions as the yarn feeding portion.

10. A yarn feeding device as described in Claim 4, characterized in that the large diameter portion and the small diameter portion are formed on the driven roller, the large diameter portion functions as the power receiving portion, and the small diameter portion functions as the yarn feeding portion.

11. A yarn feeding device as described in Claim 5, characterized in that the large diameter portion and the small diameter portion are formed on the driven roller, the large diameter portion functions as the power receiving portion, and the small diameter portion functions as the yarn feeding portion.

12. A yarn feeding device as described in Claim 6, characterized in that the large diameter portion and the small diameter portion are formed on the driven roller, the large diameter portion functions as the power receiving portion, and the small diameter portion functions as the yarn feeding portion.

13. A yarn feeding device as described in Claim 7, characterized in that the large diameter portion and the small diameter portion are formed on the driven roller, the large diameter portion functions as the power receiving portion, and the small diameter portion functions as the yarn feeding portion.

14. Each of the plurality of driven rollers is provided with a fixed shaft that rotatably supports the driven roller, and a support member that supports the fixed shaft, The yarn sending device according to any one of claims 8 to 13, wherein the fixed shaft is fixed to the support member and is detachable from the support member.

15. The yarn sending device according to claim 14, wherein each of the plurality of driven rollers is formed with both the large diameter portion and the small diameter portion.

16. 16. The yarn feeding device according to claim 15, wherein the driven roller has a configuration in which a ring-shaped member is attached to a circumferential surface of a cylindrical roller body, the portion to which the ring-shaped member is attached functions as the large diameter portion, and the portion of the roller body to which the ring-shaped member is not attached functions as the small diameter portion.

17. The yarn sending device according to claim 15, wherein the large diameter portion has a central portion and an outer peripheral portion that is detachable from the circumferential surface of the central portion.

18. The yarn sending device according to claim 15, wherein the large diameter portion of the driven roller is attached to an end surface of the small diameter portion.

19. The yarn feeding device according to claim 15, wherein each of the plurality of driven rollers is individually replaceable with a cylindrical roller having a uniform outer diameter.

20. 2. The yarn feeding device according to claim 1, wherein an axial dimension of the driven roller is larger than an axial dimension of the drive roller, and a portion of the driven roller that comes into contact with the circumferential surface of the drive roller functions as the power receiving portion, and a portion of the driven roller that does not come into contact with the circumferential surface of the drive roller functions as the yarn feeding portion.

21. The yarn sending device according to any one of claims 1 to 13, wherein a peripheral surface of the yarn sending portion is made of metal.

22. The yarn sending device according to any one of claims 1 to 13, wherein a peripheral surface of the power receiving part is made of a material having a higher coefficient of friction than a peripheral surface of the yarn sending part.

23. The yarn sending device according to any one of claims 1 to 13, further comprising a detector for detecting the number of rotations of the driven roller.

24. The yarn sending device according to any one of claims 1 to 13, characterized in that each of the plurality of driven rollers is provided with a moving mechanism that moves the driven roller between a contact position where the driven roller contacts the circumferential surface of the drive roller and a separation position where the driven roller is separated from the drive roller.

25. A separate roller is provided in the vicinity of the driven roller, The yarn sending device according to any one of claims 1 to 13, wherein the yarn is wound around the yarn sending section and the separate roller.

26. The yarn sending device according to any one of claims 1 to 13, wherein the number of the plurality of drive rollers is the same as the number of the plurality of driven rollers.

27. The yarn sending device according to any one of claims 1 to 13, wherein an axial direction of the plurality of drive rollers is parallel to a direction in which the plurality of drive rollers are arranged.

28. A false twisting machine comprising the yarn feeding device according to any one of claims 1 to 13, wherein the false twisting machine applies false twisting to a plurality of yarns fed by the yarn feeding device.

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