CN105908299B - Belt type false twisting device - Google Patents

Abstract

In the belt type false twisting device of the present invention, the durability reduction caused by the temperature rise of the belt is prevented although the driving pulley and the driven pulley are arranged close to each other. The belt extension pulley (43) is disposed on the opposite side of the driven pulley (42) from the driving pulley (41). An endless belt (44) is wound around pulleys (41-43) and is bent around a driven pulley (42). The belt extension pulley (53) is disposed on the opposite side of the driven pulley (52) from the driving pulley (51). An endless belt (54) is wound around pulleys (51-53) and is bent around a driven pulley (52). The center of the belt (44) between the driving pulley (41) and the driven pulley (42) intersects the center of the belt (54) between the driving pulley (51) and the driven pulley (52). The yarn (Y) contacts the outer edge of an end surface disk (45) rotating together with the driving pulley (41) at a portion on the downstream side of the yarn path with respect to the intersection (C) where the belts (44 and 54) intersect.

Description

Belt type false twisting device

Technical Field

The present invention relates to a belt type false twisting device for performing false twisting on a yarn by running a belt while holding a yarn between 2 crossed belts.

Background

The belt type false twisting device described in patent document 1 includes 2 belt units of a reference belt unit and a movable belt unit. The reference belt unit has an endless reference belt, and a driving pulley and a driven pulley on which the reference belt is stretched. The movable belt unit has an endless movable belt, and a driving pulley and a driven pulley on which the movable belt is stretched. The reference belt and the movable belt intersect at a central portion of a portion between the driving pulley and the driven pulley. The movable belt unit is configured to be movable in a direction perpendicular to the facing portions of the outer peripheral surfaces of the reference belt and the movable belt. The belt type false twisting device described in patent document 1 performs false twisting on a yarn by running a reference belt and a movable belt while the yarn is sandwiched between the reference belt and the movable belt.

In the belt type false twisting device described in patent document 1, a driving pulley of a reference belt unit is provided with a twist removing disc (a "twist removing point fixing member" according to the present invention) that rotates together with the driving pulley. The yarn is bent by contacting with the outer peripheral edge of the detwisted disk at a portion downstream of the yarn path with respect to an intersection (intersection) where the reference belt and the movable belt intersect. When the belts are run with the yarn sandwiched between the reference belt and the movable belt, the yarn is twisted at a portion upstream of the yarn path from the intersection portion and untwisted at a portion downstream of the yarn path from the intersection portion. At this time, if the untwisting start point is located at the intersection, the untwisted yarn rubs against the reference belt and the movable belt, and burrs are generated in the yarn. Further, the longer the untwisted yarn is rubbed against the reference belt and the movable belt, the more the yarn is likely to have burrs, the more the untwisting start point is located on the upstream side of the yarn path in the intersection. In patent document 1, since the yarn is in contact with the outer peripheral edge of the detwisted disk at a portion downstream of the crossing portion in the yarn path, the yarn is prevented from being detwisted at a portion between the crossing portion and the detwisted disk, and the detwisting start point is fixed to the detwisted disk. As a result, the untwisting start point can be located on the downstream side of the yarn path compared to the case where no detwisting disks are provided. This prevents the yarn from being burred.

[ patent document 1] Japanese patent application laid-open No. 2010-65354

In the belt false twisting device described in patent document 1, when the yarn is sandwiched between the reference belt and the movable belt, the reference belt and the movable belt are deflected. In this case, in order to uniformly bend the reference belt and the movable belt, it is preferable that the center portion of the portion between the drive pulley and the driven pulley of the reference belt and the center portion of the portion between the drive pulley and the driven pulley of the movable belt intersect. On the other hand, in patent document 1, in order to sufficiently suppress untwisting of the yarn between the intersection portion of the reference belt and the movable belt and the detwisted reel and fix the untwisting start point to the detwisted reel, it is preferable to arrange the intersection portion and the detwisted reel close to each other. These conditions can be satisfied if the reference belt unit and the movable belt unit are disposed close to each other with the driving pulley and the driven pulley disposed close to each other.

However, in the reference belt unit and the movable belt unit of patent document 1, if the driving pulley and the driven pulley are disposed close to each other, the lengths of the reference belt and the movable belt become short. In patent document 1, the reference belt and the movable belt rub against the yarn at the intersection, and generate heat due to frictional heat at that time. At this time, if the lengths of the reference tape and the movable tape are short, the time from when a certain portion of the reference tape and the movable tape reaches the intersection to when the certain portion of the reference tape and the movable tape reaches the intersection next time becomes short. Therefore, the respective portions of the reference belt and the movable belt reach the intersecting portion and rub against the yarn to generate heat, and then reach the intersecting portion again before being sufficiently cooled to generate heat by rubbing against the yarn. As a result, the temperature of the entire reference belt and the movable belt becomes high, and the durability is lowered. In this case, the friction heat between the belt and the yarn increases as the yarn is thicker, and thus the above-described problem may occur. Further, the belt is deflected at a portion stretched over the pulley, but if the length of the belt is short, the number of times each portion of the belt reaches the pulley and is deflected increases when the belt travels. As a result, the core material of the belt is easily broken and peeled off, and the durability of the belt is reduced.

Disclosure of Invention

The invention aims to provide a belt type false twisting device which can prevent the durability of a belt from being reduced although a driving pulley and a driven pulley are arranged close to each other.

A belt type false twisting device according to claim 1 of the present invention includes 2 belt units each having an endless belt and a driving pulley and a driven pulley on which the belt is stretched, the belts of the 2 belt units being arranged to intersect each other at a central portion of a portion between the driving pulley and the driven pulley, and the false twisting being performed on the yarn by running the belts in a state where the yarn is sandwiched between the portions where the belts of the 2 belt units intersect each other; the belt false twisting device is characterized in that one of the 2 belt units further comprises a untwisting point fixing member which is provided on the driving pulley and rotates together with the driving pulley, and which contacts a portion of the yarn on the downstream side of the yarn path with respect to the portion sandwiched by the belts to suppress untwisting of the yarn and fix an untwisting start point, and the 2 belt units further respectively comprise belt extension pulleys which are disposed on the opposite side of the driving pulley from the driven pulley and on which the belts are stretched.

According to the present invention, the yarn is twisted at a portion on the upstream side of the yarn path from a diamond-shaped portion (hereinafter referred to as "intersection") where the tapes of 2 tape units cross each other, and the twisted yarn is untwisted at a portion on the downstream side of the yarn path from the intersection. At this time, if the untwisting start point is located within the intersection, the untwisted yarn may rub against the belt, thereby causing a burr to be generated in the yarn. Further, the more the untwisting start point is located on the upstream side of the yarn path in the intersection, the longer the length of the untwisted yarn rubbed against the belt, and the more likely the yarn is to have burrs. However, in the present invention, since the yarn at the intersection contacts the untwisting point fixing member, the untwisting of the yarn is suppressed between the intersection and the untwisting point fixing member, and the untwisting start point is fixed to the untwisting point fixing member. Thus, the untwisting starting point can be positioned downstream of the yarn path compared to the case where the untwisting point fixing member is not provided. This can suppress the occurrence of burrs on the yarn.

In this case, the belt of each belt unit is bent at a portion between the driving pulley and the driven pulley, and it is preferable that the belts of 2 belt units cross each other at a central portion of the portion between the driving pulley and the driven pulley in order to make the bending of the belt uniform. On the other hand, in order to sufficiently suppress the untwisting of the yarn between the intersection point and the untwisting point fixing member and fix the untwisting start point to the untwisting point fixing member, it is preferable to arrange the intersection point and the untwisting point fixing member as close as possible. In each belt unit, if the driving pulley and the driven pulley are disposed close to each other, these conditions can be satisfied.

However, in the case where the belt is stretched over only 2 pulleys, i.e., the driving pulley and the driven pulley, unlike the present invention, if the driving pulley and the driven pulley are arranged close to each other, the length of the belt becomes short. Of these, the 2 belt unit belts generate heat due to frictional heat when rubbing the yarn at the intersection. At this time, if the length of the belt is short, the time until a certain portion of the belt reaches the intersection next time after the certain portion of the belt reaches the intersection becomes short. Therefore, after the respective portions of the belt reach the intersection and generate heat by friction with the yarn, the respective portions reach the intersection again before being sufficiently cooled, and heat generation continues due to friction with the yarn. As a result, the temperature of the entire belt of each belt unit increases, and the durability decreases. In this case, the larger the thickness of the yarn, the greater the frictional heat between the belt and the yarn, and therefore the possibility of the above-described problem is increased. Further, the belt is bent at a portion stretched over the pulley, but if the length of the belt is short, the number of times each portion of the belt reaches the pulley and is bent increases when the belt travels. As a result, the core material of the belt is easily broken and peeled off, and the durability of the belt is reduced.

In the present invention, each belt unit is provided with a belt extension pulley that is disposed on the opposite side of the driven pulley from the driving pulley and on which the belt is stretched. This can increase the length of the belt as compared with the case where the belt extension pulley is not provided. If the length of the belt is long, the respective portions of the belt generate heat by friction with the yarn when reaching the intersection, and then the belt is cooled sufficiently and then generates heat by friction with the yarn when reaching the intersection again. Therefore, the temperature rise of the entire belt can be suppressed regardless of the yarn thickness, and the durability of the belt can be prevented from being lowered. Further, if the length of the belt is long, the number of times each portion of the belt is bent by reaching the pulley when the belt travels is reduced. This can prevent the core material of the belt from breaking and peeling off, thereby preventing the durability of the belt from being reduced.

The belt false twisting device according to claim 2 is the belt false twisting device according to claim 1, wherein the driven pulley bends the belts in any one of a state in which the belts of the 2 belt units are brought into contact with each other and a state in which the belts of the 2 belt units are not brought into contact with each other, and the belts of the 2 belt units intersect each other at a central portion of a portion between the driving pulley and the portion bent by the driven pulley.

According to the present invention, since the belt is in close contact with the driven pulley disposed between the driving pulley and the belt extension pulley, the driven pulley can be reliably rotated when the driving pulley is driven to run the belt.

The belt false twisting device according to claim 3 is the belt false twisting device according to claim 2, wherein a bending angle of the belt by the driven pulley is 0.5 degrees or more in a state where the belts of the 2 belt units are not in contact with each other.

According to the present invention, if the bending angle of the belt by the driven pulley is set to 0.5 degrees or more, the driven pulley can be more reliably rotated when the belt is driven to travel by driving the driving pulley.

The belt false twisting device according to claim 4 is the belt false twisting device according to claim 2 or 3, wherein the diameter of the driving pulley is equal to or smaller than the diameter of the driven pulley, and the diameter of the belt extension pulley is smaller than the diameter of the driven pulley.

According to the present invention, if the diameter of the driving pulley is equal to or smaller than the diameter of the driven pulley and the diameter of the belt-extending pulley is smaller than the diameter of the driven pulley, the belt can be reliably bent on the driven pulley.

The belt false twisting device according to claim 5 is the belt false twisting device according to claim 4, wherein, when viewed from the axial direction of the drive pulley, the driven pulley, and the belt-extension pulley, the shaft of the driven pulley is offset to a side where the belts of 2 belt units cross each other from a straight line connecting the shaft of the drive pulley and the shaft of the belt-extension pulley.

When the difference in diameter between the pulleys is small, or the like, the belt may not be sufficiently bent on the driven pulley. In the present invention, the shaft of the driven pulley is disposed offset to the side where the belts of 2 belt units cross each other from the straight line connecting the shaft of the driving pulley and the shaft of the extension pulley, and therefore the belts can be bent more reliably on the driven pulley.

The belt false twisting device according to claim 6 is the belt false twisting device according to claim 2 or 3, wherein the diameter of the driving pulley, the diameter of the driven pulley, and the diameter of the belt-extending pulley are the same,

the shaft of the driven pulley is disposed off the straight line connecting the shaft of the drive pulley and the shaft of the extension pulley when viewed in the axial direction of the drive pulley, the driven pulley, and the belt extension pulley.

According to the present invention, when the diameters of the driving pulley, the driven pulley, and the belt-extending pulley are the same, if the shaft of the driven pulley is disposed off the straight line connecting the shaft of the driving pulley and the shaft of the belt-extending pulley as viewed from the axial direction of the pulleys, the belt can be bent on the driven pulley. In this case, the diameters of the driving pulley, the driven pulley, and the extension pulley are the same, and therefore the driving pulley, the driven pulley, and the extension pulley can share components.

A belt false twisting device according to claim 7 of the present invention is the belt false twisting device according to any one of claims 1 to 6, wherein at least one of the 2 belt units has a structure in which a shaft of the drive pulley and a shaft of the driven pulley are fixed to each other, and a shaft of the belt-extension pulley is configured to be movable with respect to the shaft of the drive pulley and the shaft of the driven pulley, and further includes a moving device for moving the shaft of the belt-extension pulley with respect to the shaft of the drive pulley and the shaft of the driven pulley.

According to the present invention, the tension of the belt can be adjusted by moving the shaft of the belt extension pulley relative to the shafts of the driving pulley and the driven pulley. Thus, the contact pressure of the belts of 2 belt units can be adjusted, and the force applied to the yarn from the belt units (the force for conveying the yarn, the force for applying the twist to the yarn) can be controlled.

Among them, in order to stabilize the force for feeding the yarn and the force for imparting the twist to the yarn, it is necessary to sufficiently bring the surfaces of the belts of the 2 belt units into contact with each other. And, the belts of the 2 belt units contact each other at a portion located between the driving pulley and the driven pulley. In contrast, if the tension of the belt is adjusted by moving either the shaft of the driving pulley or the shaft of the driven pulley, unlike the present invention, there is a concern that the portion of the belt located between the driving pulley and the driven pulley may be inclined, for example, by the shaft being moved being inclined when the shaft of the pulley is moved. Further, if the tape is inclined in this manner, the adhesion between the tapes of 2 tape units may be reduced.

Therefore, in the present invention, the tension of the belt is adjusted by moving the belt-extending pulley. Thus, when the tension of the belt is adjusted, the portion of the belt located between the driving pulley and the driven pulley does not incline as described above.

In order to ensure the close contact between the belts of the 2 belt units, the shafts of the driving pulley and the driven pulley must be accurately parallel to each other. For this reason, the structure for supporting the driving pulley and the driven pulley requires high accuracy. In contrast, even if the shaft of the belt extension pulley is slightly inclined with respect to the shaft of the driving pulley and the shaft of the driven pulley, the portion of the belt located between the driving pulley and the driven pulley is not inclined. Therefore, the structure for supporting the shaft of the belt-extension pulley and the structure for moving the belt-extension pulley do not require so high accuracy, and a simple structure can be adopted.

The invention has the following effects: according to the present invention, even if the intersection and the untwisting point fixing member are disposed close to each other, the durability of the belt can be prevented from being lowered.

Drawings

FIG. 1 is a schematic configuration diagram of a false twist processing machine according to an embodiment of the present invention;

FIG. 2 is a schematic configuration view of the belt false twisting device of FIG. 1;

fig. 3(a) is a view of fig. 2 viewed from the direction of arrow a, and (B) is a view of fig. 2 viewed from the direction of arrow B;

FIG. 4 is a view showing a state where the belts of the belt false twisting device are separated from each other, (a) is a view corresponding to FIG. 3(a), and (b) is a view corresponding to FIG. 3 (b);

fig. 5(a) is a view showing a connection structure of 3 pulleys of the fixed belt unit viewed from the axial direction of the pulleys of the fixed belt unit, and (b) is a view of (a) viewed from the direction of arrow VB;

fig. 6(a) is a view showing a coupling structure of 3 pulleys of the movable belt unit viewed from the axial direction of the pulleys of the movable belt unit, and (b) is a view of (a) viewed from the direction of an arrow VIB;

fig. 7(a) is a view corresponding to fig. 3(a) of modification 1, and (b) is a view corresponding to fig. 3(b) of modification 1;

fig. 8(a) is a view corresponding to fig. 3(a) of modification 2, and (b) is a view corresponding to fig. 3(b) of modification 2;

fig. 9(a) is a view corresponding to fig. 3(a) of modification 3, and (b) is a view corresponding to fig. 3(b) of modification 3;

fig. 10(a) is a view corresponding to fig. 3(a) of modification 4, and (b) is a view corresponding to fig. 3(b) of modification 4;

fig. 11(a) is a view corresponding to fig. 3(a) of modification 5, and (b) is a view corresponding to fig. 3(b) of modification 5;

fig. 12(a) is a view corresponding to fig. 3(a) of modification 6, and (b) is a view corresponding to fig. 3(b) of modification 6;

fig. 13 is a view corresponding to fig. 3(b) of modification 7.

Description of the reference numerals: 24-a belt false twisting device; 31-a securing strap unit; 32-a movable belt unit; 41. 51-a drive pulley; 42. 52-a driven pulley; 43. 53-belt extension pulley; 41a, 42a, 43a, 51a, 52a, 53 a-central axis; 44. 54-a belt; 45-end face disk;

Detailed Description

The preferred embodiments of the present invention will be described below.

As shown in fig. 1, the false twist processing machine 1 of the present embodiment is a device including: a plurality of devices (a primary yarn feeding roller 20, a primary heating device 21, a cooling device 23, a belt false twisting device 24, a secondary yarn feeding roller 25, a secondary heating device 26, a tertiary yarn feeding roller 27, and the like described later) constituting the yarn processing section 12 described later are arranged in the longitudinal direction of the machine body (the direction perpendicular to the drawing of fig. 1) in a horizontal direction perpendicular to the running surface (the drawing of fig. 1) of the yarn on which the yarn path extending from the creel stand 11 to the winding section 13 through the yarn processing section 12 is arranged. In the false twist texturing machine 1, the creel holder 11, the yarn processing section 12, and the winding section 13 are arranged so that the creel holder 11 side is the outer side and symmetrically arranged in a direction (the left-right direction in fig. 1) horizontal and orthogonal to the machine longitudinal direction.

The creel stand 11 includes a plurality of creels 11 a. The plurality of creels 11a hold the yarn supplying packages S, respectively.

The yarn processing section 12 includes a primary yarn feeding roller 20, a primary heating device 21, a cooling device 23, a belt false twisting device 24, a secondary yarn feeding roller 25, a secondary heating device 26, and a tertiary yarn feeding roller 27 in this order from the upstream side of the yarn path.

The primary yarn feeding roller 20 feeds the plurality of yarns Y supplied from the yarn supplying package S toward the primary heating device 21. The primary heating device 21 heats the plurality of yarns Y fed from the primary feed roller 20. Further, a yarn stop guide 22 is disposed on the upstream side of the yarn path of the yarn Y from the primary heating device 21. The yarn stop guide 22 is a member for preventing the twist from being transmitted to the upstream side of the yarn stop guide 22 when the yarn Y is twisted as described later.

The cooling device 23 cools the plurality of yarns Y heated by the primary heating device 21. The belt type false twisting device 24 false-twists the yarn Y. At this time, the yarn Y is twisted between the twist stop guide 22 and the belt false twisting device 24, and untwisted between the belt false twisting device 24 and the secondary yarn feeding roller 25. At this time, the yarn Y is twisted while being heated by the primary heating device 21, and is cooled and heat-set by the cooling device 23 while being twisted. Therefore, when the yarn Y is untwisted, each single fiber is in a false twist state in a wavy form. The detailed structure of the belt type false twisting device 24 will be described later.

The secondary feed roller 25 feeds the yarn Y false-twisted by the belt false twisting device 24 to the secondary heating device 26. The yarn Y is fed by the secondary feed roller 25 at a speed higher than the speed of the yarn Y fed by the primary feed roller 20, and the yarn Y is stretched by the difference in the feeding speeds of the primary feed roller 20 and the secondary feed roller 25. The secondary heating device 26 performs a predetermined relaxation heat treatment on the yarn Y subjected to the false twisting while being stretched.

The tertiary feed roller 27 feeds the yarn Y subjected to the relaxation heat treatment to the winding section 13. The third yarn feeding roller 27 is disposed at an interval from the secondary heating device 26 in a direction (left-right direction in fig. 1) which is horizontal and orthogonal to the longitudinal direction of the machine body. A not-shown work table or work carriage is provided in a space between the secondary heating device 26 and the tertiary yarn feeding roller 27, and an operator can perform operations such as yarn threading on the work table or work carriage.

The winding unit 13 includes a plurality of winding devices 60. The plurality of winding devices 60 are arranged in the longitudinal direction of the machine body and in the vertical direction. The winding device 60 mounts the bobbin in such a direction that the longitudinal direction of the body is parallel to the axial direction, and the winding device 60 winds the yarn Y fed from the tertiary yarn feeding roller 27 onto the bobbin while traversing the yarn Y in the axial direction of the bobbin (longitudinal direction of the body), thereby forming a package P.

Next, the structure of the belt type false twisting device 24 will be described in detail.

As shown in fig. 2 to 4, the belt false twisting device 24 includes a fixed belt unit 31 and a movable belt unit 32. The fixed belt unit 31 includes a driving pulley 41, a driven pulley 42, a belt extension pulley 43, a belt 44, and an end surface plate 45 ("untwisting point fixing member" in the present invention).

The driving pulley 41 and the driven pulley 42 have the same diameter D1 (for example, about 40 mm). The belt extension pulley 43 has a diameter D2 (e.g., about 38.5 mm) smaller than the diameter D1 of the pulleys 41 and 42. The pulleys 41 to 43 are disposed such that the center axes 41a to 43a are positioned on a straight line L1, and the driven pulley 42 is disposed between the driving pulley 41 and the belt extension pulley 43. That is, the belt-extension pulley 43 is located on the opposite side of the driven pulley 42 from the driving pulley 41. The motor 46 is connected to the driving pulley 41, and if the motor 46 is driven, the driving pulley 41 rotates in the direction indicated by the arrow E1 in fig. 2 and 3. In the fixed belt unit 31, the diameters of the driving pulley 41 and the driven pulley 42 are the same D1. Thus, the driving pulley 41 and the driven pulley 42 constituting the fixed belt unit 31 can share components.

The belt 44 is an endless belt made of rubber or the like, and is wound around the pulleys 41 to 43. Thus, if the drive motor 46 rotates the driving pulley 41, the belt 44 travels, and the pulleys 42 and 43 rotate accordingly. At this time, the diameter D2 of the belt-extending pulley 43 is smaller than the diameter D1 of the pulleys 41 and 42 as described above, and therefore the belt 44 is bent on the driven pulley 42. As a result, the belt 44 is closely attached to the driven pulley 42 disposed between the driving pulley 41 and the belt extension pulley 43, and when the belt 44 travels, the driven pulley 42 reliably rotates. The bending angle θ of the belt 44 on the driven pulley 42 is 0.5 degrees or more (e.g., about 0.89 degrees) in a state where the belt 44 is not in contact with a belt 54 described later.

The end surface disk 45 is a disk-shaped member, is provided on the driving pulley 41, and rotates together with the driving pulley 41. As shown in fig. 3(b), the outer edge portion of the end surface disk 45 is inclined with respect to the axial direction of the end surface disk 45 such that a portion of the end surface disk 45 that is closer to the driving pulley 41 in the axial direction is located radially inward. As described later, the end disc 45 is a member for suppressing the untwisting of the yarn Y and fixing the untwisting start point to the end disc 45.

The movable belt unit 32 includes a driving pulley 51, a driven pulley 52, a belt extension pulley 53, and a belt 54. The driving pulley 51 and the driven pulley 52 are pulleys having the same diameter D1. The belt extension pulley 53 has a diameter D2 smaller than the diameter D1 of the pulleys 51 and 52. The pulleys 51 to 53 are disposed with their central axes aligned on a straight line L2 intersecting the straight line L1, and the driven pulley 52 is disposed between the driving pulley 51 and the belt extension pulley 53. That is, the belt extension pulley 53 is located on the opposite side of the driven pulley 52 from the driving pulley 51. A motor 55 is connected to the driving pulley 51, and when the motor 55 is driven, the driving pulley 51 rotates in a direction indicated by an arrow E2 in fig. 2 and 3. In the movable belt unit 32, the diameters of the driving pulley 51 and the driven pulley 52 are the same D1. Therefore, the driving pulley 51 and the driven pulley 52 constituting the movable belt unit 32 can share components.

The belt 54 is an endless belt made of rubber or the like, and is wound around the pulleys 51 to 53. Thus, when the driving motor 55 rotates the driving pulley 51, the belt 54 travels, and the pulleys 52 and 53 rotate accordingly. At this time, the diameter D2 of the belt-extending pulley 53 is smaller than the diameter D1 of the pulleys 51, 52 as described above, and therefore the belt 54 bends over the driven pulley 52. Thus, the belt 54 is in close contact with the driven pulley 52 disposed between the driving pulley 51 and the belt extension pulley 53, and when the belt 44 travels, the driven pulley 52 reliably rotates. The bending angle θ of the belt 54 on the driven pulley 52 is 0.5 degrees or more (for example, about 0.89 degrees) in a state where the belt 54 is not in contact with the belt 44.

Next, the connection structure of the 3 pulleys 41 to 43 in the fixed belt unit 31 and the connection structure of the 3 pulleys 51 to 53 in the movable belt unit 32 will be described.

As shown in fig. 5(a) and (b), the driving pulley 41 of the fixed belt unit 31 is mounted on the rotating shaft 61 of the motor 46. The motor 46 is fixed to the frame 64. The housing 64 is provided with a shaft 62 for rotatably supporting the driven pulley 42 and a shaft 63 for rotatably supporting the belt extension pulley 43. Thus, the positional relationship of the rotating shafts 61 to 63 is fixed. That is, the positional relationship among the central axis 41a of the driving pulley 41, the central axis 42a of the driven pulley 42, and the central axis 43a of the belt-extending pulley 43 is fixed.

On the other hand, as shown in fig. 6(a) and (b), the driving pulley 51 of the movable belt unit 32 is attached to the rotating shaft 71 of the motor 55. The motor 55 is fixed to the housing 74. The housing 74 is provided with a rotating shaft 72 that rotatably supports the driven pulley 52. Thereby, the positional relationship between the rotating shaft 71 and the rotating shaft 72 is fixed. That is, the positional relationship between the central axis 51a of the driving pulley 51 and the central axis 52a of the driven pulley 52 is fixed.

A slide member 75 is attached to an end portion of the housing 74 on the opposite side to the motor 55. The slide member 75 is supported to be movable parallel to the straight line L2 as indicated by an arrow H with respect to the housing 74. The slide member 75 is provided with a rotating shaft 73 that rotatably supports the belt extension pulley 53. Thereby, the rotation shaft 73 can move relative to the rotation shafts 71 and 72. That is, the central axis 53a of the belt-extending pulley 53 is movable relative to the central axis 51a of the driving pulley 51 and the central axis 52a of the driven pulley 52. The slide member 75 is moved by a hydraulic cylinder ("moving means" of the present invention). When the sliding member 75 moves and the rotating shaft 73 moves relative to the rotating shafts 71 and 72, the tension of the belt 54 changes.

Next, the positional relationship between the fixed belt unit 31 and the movable belt unit 32 will be described. The fixed belt unit 31 and the movable belt unit 32 are disposed so that the central portion of the belt 44 between the driving pulley 41 and the driven pulley 42 intersects with the central portion of the belt 54 between the driving pulley 51 and the driven pulley 52. As shown by arrows F in fig. 3(a) and (b), the movable belt unit 32 is configured to be movable relative to the fixed belt unit 31 in a direction perpendicular to the portions of the outer peripheral surfaces of the belts 44 and 54 that face each other. Thus, if the movable belt unit 32 is moved in a direction to separate from the fixed belt unit 31, the belt 54 can be separated from the belt 44. Further, if the movable belt unit 32 is moved in a direction to approach the fixed belt unit 31, the belt 54 can be brought into contact with the belt 44. Note that, since the mechanism for moving the movable belt unit 32 is the same as the conventional one (see, for example, japanese patent application laid-open No. 2010-65354), a detailed description thereof is omitted here.

In a state where the belt 54 is brought into contact with the belt 44, the belts 44, 54 are bent. At this time, as described above, since the center portion of the belt 44 between the driving pulley 41 and the driven pulley 42 is in contact with the center portion of the belt 54 between the driving pulley 51 and the driven pulley 52, the portion of the belt 44 between the driving pulley 41 and the driven pulley 42 is uniformly deflected, and the portion of the belt 54 between the driving pulley 51 and the driven pulley 52 is uniformly deflected.

In the present embodiment, the movable belt unit 32 moves in the direction perpendicular to the portions of the outer circumferential surfaces of the belts 44 and 54 that face each other, and the belts 54 and 44 are brought into contact with each other, so that the contact pressure in the width direction of the belts 44 and 54 can be made uniform.

In the belt false twisting device 24, if the yarn Y is threaded into the yarn processing portion 12 in a state where the movable belt unit 32 is separated from the fixed belt unit 31 and the belt 54 is separated from the belt 44, the yarn Y passes between the belt 44 and the belt 54, and a portion of the yarn Y located on the downstream side of a portion immediately passing between the belt 44 and the belt 54 comes into contact with the outer edge portion of the end surface plate 45, as shown in fig. 4(a) and (b). In this state, the motors 46 and 55 are driven to run the belts 44 and 54, and then the movable belt unit 32 is brought close to the fixed belt unit 31, whereby the belt 54 is brought into contact with the belt 44. Then, as shown in fig. 3(a) and (b), the yarn Y is sandwiched between the belt 44 and the belt 54, and the belts 44 and 54 run in this state. Thereby, the yarn Y is twisted at a rhombic portion where the belt 44 and the belt 54 cross, that is, a portion between the intersection C and the twist stop guide 22. And, the yarn Y is untwisted at the portion between the intersection C and the secondary feed roller 25. At this time, since the portion of the yarn Y located immediately downstream of the intersection C comes into contact with the outer edge portion of the end disc 45, the yarn Y is prevented from untwisting at the portion between the intersection C and the end disc 45, and the untwisting start point is fixed to the end disc 45.

However, if the untwisting start point of the yarn Y is located in the intersection C, the untwisted yarn Y may rub against the belts 44 and 54, thereby causing burrs on the yarn Y. At this time, the yarn Y is more likely to generate burrs as the length of friction between the untwisted yarn Y and the belts 44 and 54 becomes longer as the untwisting start point of the yarn Y is located on the upstream side of the yarn path at the intersection C. In the present embodiment, as described above, the untwisting of the yarn Y is suppressed in the portion between the intersection C and the end surface plate 45, and the untwisting start point of the yarn Y is fixed to the end surface plate 45. Therefore, the untwisting start point of the yarn Y is shifted to the downstream side of the yarn path compared to the case where the end disc 45 is not provided. This makes it possible to position the untwisting start point of the yarn Y downstream of the intersection C in the yarn path. This can suppress the occurrence of burrs on the untwisted yarn Y.

In order to uniformly flex the belt 44 between the driving pulley 41 and the driven pulley 42 and to uniformly flex the belt 54 between the driving pulley 51 and the driven pulley 52 as described above, it is preferable that the center portion of the belt 44 between the driving pulley 41 and the driven pulley 42 be in contact with the center portion of the belt 54 between the driving pulley 41 and the driven pulley 52. On the other hand, in order to sufficiently suppress untwisting of the yarn Y between the intersection C and the end disc 45, the untwisting start point is fixed to the end disc 45, and it is preferable to make the intersection C and the end disc 45 as close as possible. In the present embodiment, these conditions are satisfied by disposing the driving pulley 41 and the driven pulley 42, and the driving pulley 51 and the driven pulley 52 as close as possible, respectively.

At this time, if the fixed belt unit 31 does not have the belt extension pulley 43 and the belt 44 is wound around only 2 pulleys 41 and 42 unlike the present invention, the length of the belt 44 becomes short if the driving pulley 41 and the driven pulley 42 are disposed close to each other. Similarly, if the movable belt unit 32 does not have the belt extension pulley 53 and the belt 54 is wound around only 2 pulleys 51 and 52, the length of the belt 54 becomes shorter if the driving pulley 51 and the driven pulley 52 are disposed close to each other.

However, if the length of the belt 44 is short, the time until a certain portion of the belt 44 comes into contact with the belt 54 next time after the certain portion of the belt 44 comes into contact with the belt 54 becomes short. Therefore, each portion of the belt 44 reaches the intersection C and then frictionally heats the yarn Y, and then reaches the intersection C again before being sufficiently cooled, thereby frictionally heating the yarn Y. As a result, the temperature of the entire belt 44 becomes high (for example, 100 ℃ or higher), and the durability is lowered.

Also, if the length of the belt 54 is short, after a certain portion of the belt 54 comes into contact with the belt 44, the time until the next contact of the portion of the belt 54 with the belt 44 becomes short. Therefore, each portion of the belt 54 reaches the intersection C and frictionally heats the yarn Y, and then reaches the intersection C again before being sufficiently cooled, and frictionally heats the yarn Y. As a result, the temperature of the entire belt 54 increases (for example, 100 ℃ or higher), and the durability decreases.

In addition, since the friction heat between the yarn Y and the belts 44 and 54 increases as the thickness of the yarn Y increases, the possibility of the above problem increases.

Further, the belt 44 is bent at the portion stretched over the pulleys 41 to 43, but if the length of the belt 44 is short, the number of times each portion of the belt 44 reaches the pulleys 41 to 43 to be bent increases when the belt 44 travels. As a result, the core material of the tape 44 is easily broken and peeled off, and the durability of the tape 44 is reduced. Similarly, the belt 54 is bent at the portion stretched over the pulleys 51 to 53, but if the length of the belt 54 is short, the number of times each portion of the belt 54 reaches the pulleys 51 to 53 and bends increases when the belt 54 travels. As a result, the core material of the belt 54 is easily broken and peeled off, and the durability of the belt 54 is reduced.

In contrast, in the present embodiment, the fixed belt unit 31 includes a belt extension pulley 43 disposed on the opposite side of the driven pulley 42 from the driving pulley 41, in addition to the driving pulley 41 and the driven pulley 42, and the belt 44 is wound around the pulleys 41 to 43. This can increase the length of the belt 44 as compared with the case where the belt 44 is wound around only 2 pulleys 41 and 42. Similarly, in the present embodiment, the movable belt unit 32 includes a belt extension pulley 53 disposed on the driven pulley 52 on the opposite side of the driving pulley 51 in addition to the driving pulley 51 and the driven pulley 52, and the belt 54 is wound around the pulleys 51 to 53. This can increase the length of the belt 54 as compared with the case where the belt 54 is wound around only 2 pulleys 51 and 52. Further, if the belts 44 and 54 are long, the respective portions of the belts 44 and 54 rub against the yarn Y to generate heat when reaching the intersection C, are sufficiently cooled, and then reach the intersection C again to generate heat when rubbing against the yarn Y. Therefore, regardless of the thickness of the yarn Y, the temperature rise of the entire belts 44 and 54 is suppressed, and the durability of the belts 44 and 54 can be prevented from being lowered.

Further, if the length of the belt 44 is increased, the number of times each part of the belt 44 reaches the pulleys 41 to 43 and bends when the belt 44 travels is reduced. Therefore, the decrease in the durability of the belt due to the core material of the belt 44 breaking or peeling can be suppressed. Similarly, if the length of the belt 54 is increased, the number of times each part of the belt 54 reaches the pulleys 51 to 53 and bends when the belt 54 travels is reduced. Therefore, the decrease in the durability of the belt due to the core material of the belt 54 breaking or peeling can be suppressed.

In the present embodiment, if the rotating shaft 73 (belt extension pulley 53) is moved to change the tension of the belt 54 when twisting the yarn Y in the belt false twisting device 24, the contact pressure between the belt 44 and the belt 54 is changed. This makes it possible to control the force with which the yarn Y is conveyed by the belts 44 and 54 and the force with which the yarn Y is twisted, in accordance with the tension of the yarn Y. At this time, the greater the tension of the belt 54, the greater the contact pressure between the belt 44 and the belt 54, and the greater the force of the belts 44, 54 to convey the yarn and the force of the twisting the yarn.

However, it is also conceivable that, unlike the present invention, the tension of the belt 54 is changed by moving the rotating shaft 71 (the central shaft 51a of the driving pulley 51) or the rotating shaft 72 (the central shaft 52a of the driven pulley 52) instead of the moving rotating shaft 73 (the central shaft 53a of the belt extension pulley 53). However, in this case, when the rotating shaft 71 or 72 is moved, the contact portion of the belt 54 with the belt 44 may be inclined, and the adhesion between the belt 44 and the belt 54 may be lowered.

More specifically, in the belt false twisting device 24, the belts 44 and 54 are moved while the yarn Y is sandwiched between the belts 44 and 54, whereby the yarn Y is fed to the downstream side of the yarn path by applying a force thereto, and is twisted. At this time, in order to stabilize the force applied to the yarn Y, the portions of the belts 44 and 54 that are in contact with each other need to be sufficiently in close contact with each other. However, if the rotating shaft 71 or 72 is moved, unlike the present invention, the moved shaft may be inclined, and the contact portion of the belt 54 with the belt 44 may be inclined. If such a tilt occurs in the belt 54, the adhesion between the belt 44 and the belt 54 may be reduced.

In contrast, in the present embodiment, the tension of the belt 54 is adjusted by moving the rotating shaft 73 (belt extension pulley 53), and therefore the positional relationship between the rotating shaft 71 (driving pulley 51) and the rotating shaft 72 (driven pulley 52) can be maintained even if the tension of the belt 54 is adjusted. Therefore, when the tension of the belt 54 is adjusted, the contact portion of the belt 54 with the belt 44 is not inclined.

In the present embodiment, in order to prevent the contact portion of the belt 54 with the belt 44 from being inclined, it is necessary to accurately maintain the state where the shafts 71 and 72 are parallel to each other in the axial direction. In contrast, even if the rotating shaft 73 is slightly inclined with respect to the rotating shafts 71 and 72, the contact portion of the belt 54 with the belt 44 is not inclined. Therefore, the structure for supporting the rotating shaft 73 and the structure for moving the rotating shaft 73 do not require high accuracy much, and a simple structure can be adopted.

Next, a modification of the present embodiment will be described.

In the above embodiment, the driving pulley 41 and the driven pulley 42 are members having the same diameter D1, and the driving pulley 51 and the driven pulley 52 are members having the same diameter D1, but the present invention is not limited thereto.

In modification 1, as shown in fig. 7(a), the diameter of the driving pulley 41 in the fixed belt unit 31 is D2 that is the same as the diameter of the belt-extending pulley 43. Similarly, as shown in fig. 7(b), in the movable belt unit 32, the diameter of the driving pulley 51 is D2 which is the same as the diameter of the belt-extending pulley 53. Even in this case, the belt 44 is bent at the driven pulley 42 and thus closely attached to the driven pulley 42. Further, the belt 54 is bent at the driven pulley 52, and thus is in close contact with the driven pulley 52. Thus, when the driving pulleys 41 and 51 are rotated to run the belts 44 and 54, the driven pulleys 42 and 52 can be reliably rotated. In addition, in the case of modification 1, since the diameters of the drive pulley 41 and the belt-extension pulley 43 are the same as D2, the drive pulley 41 and the belt-extension pulley 43 can share components in the fixed belt unit 31. Similarly, since the diameters of the driving pulley 51 and the belt-extending pulley 53 are the same D2, the driving pulley 51 and the belt-extending pulley 53 can share components in the movable belt unit 32.

Further, in modification 1, the diameters of the drive pulleys 41 and 51 are D2 that are the same as the diameters of the belt-extension pulleys 43 and 53, but the present invention is not limited to this. The diameters of the driving pulleys 41 and 51 may be smaller than the diameters D1 of the driven pulleys 42 and 52 and may be different from the diameters D2 of the belt-extension pulleys 43 and 53. Even in this case, the belts 44 and 54 are bent around the driven pulleys 42 and 52, and thereby are brought into close contact with the driven pulleys 42 and 52.

In the above embodiment, the diameter of the belt-extension pulley 43 is D2 smaller than the diameter D1 of the pulleys 41 and 42, and the diameter of the belt-extension pulley 53 is D2 smaller than the diameter D1 of the pulleys 51 and 52, but the present invention is not limited thereto.

In modification 2, as shown in fig. 8(a), the diameter of the driving pulley 41 in the fixed belt unit 31 is D2 smaller than the diameter D1 of the driven pulley 42. The diameter of the belt extension pulley 43 is D1, which is the same as the diameter of the driven pulley 42. Similarly, in the movable belt unit 32, as shown in fig. 8(b), the diameter of the driving pulley 51 is D2 smaller than the diameter D1 of the driven pulley 52. The diameter of the belt extension pulley 53 is D1, which is the same as the diameter of the driven pulley 52. In this case, the belt 44 is bent at the driven pulley 42 and thus closely contacts the driven pulley 42. Further, the belt 54 is bent at the driven pulley 52, and thus is in close contact with the driven pulley 52. Thus, when the driving pulleys 41 and 51 are rotated to run the belts 44 and 54, the driven pulleys 42 and 52 can be reliably rotated. In addition, in the case of modification 2, since the diameters of the driven pulley 42 and the belt-extension pulley 43 are the same as D1, the driven pulley 42 and the belt-extension pulley 43 can share components in the fixed belt unit 31. Similarly, since the diameters of the driven pulley 52 and the belt-extending pulley 53 are the same D1, the driven pulley 52 and the belt-extending pulley 53 can share components in the movable belt unit 32.

In the above embodiment and modifications 1 and 2, one of the driving pulley 41 and the belt extension pulley 43 of the fixed belt unit 31 has a diameter equal to or smaller than the diameter D1 of the driven pulley 42, and the other pulley has a diameter smaller than the diameter D1 of the driven pulley 42. In the movable belt unit 32, one of the driving pulley 51 and the belt extension pulley 53 has a diameter equal to or smaller than the diameter D1 of the driven pulley 52, and the other pulley has a diameter smaller than the diameter D1 of the driven pulley 52. But is not limited thereto. As long as the belts 44, 54 are bent over the driven pulleys 42, 52, for example, in the above embodiment, the diameters of the driving pulleys 41, 51 may be larger than the diameter D1 of the driven pulleys 42, 52.

In the above embodiment and modification 1, the belts 44 and 54 are bent at 2 places by the driven pulleys 42 and 52, respectively, but the present invention is not limited to this. In modification 3, as shown in fig. 9(a), the diameters of the pulleys 41 to 43 are all the same D1 in the fixed belt unit 31. The center axis 42a of the driven pulley 42 is disposed offset toward the movable belt unit 32 with respect to a straight line L3 connecting the center axis 41a of the driving pulley 41 and the center axis 43a of the belt-extending pulley 43. As shown in fig. 9(b), in the movable belt unit 32, the diameters of the pulleys 51 to 53 are all the same D1. The center axis 52a of the driven pulley 52 is disposed on the fixed belt unit 31 side with respect to a straight line L4 connecting the center axis 51a of the driving pulley 51 and the center axis 53a of the belt extending pulley 53.

In this case, the belt 44 is tightly attached to the driven pulley 42 only on the movable belt unit 32 side by being bent by the driven pulley 42. The belt 54 is bent by the driven pulley 52 only on the fixed belt unit 31 side, and is brought into close contact with the driven pulley 52. Therefore, even in this case, when the belts 44, 54 travel, the driven pulleys 42, 52 surely rotate. Also, in this case, the belt 44 is in contact with a portion of the belt 54 between the driving pulley 51 and the portion bent by the driven pulley 52. The belt 54 is in contact with a portion of the belt 44 between the portion where the driving pulley 41 and the driven pulley 42 are bent.

Further, in modification 3, the diameters of the pulleys 41 to 43 and the pulleys 51 to 53 are all D1, but the invention is not limited to this.

For example, in modification 4, as shown in fig. 10(a) and (b), the diameter D2 of the pulley 43 is smaller than the diameter D1 of the pulleys 41 and 42, and the diameter D2 of the pulley 53 is smaller than the diameter D1 of the pulleys 51 and 52, as in the above embodiment. As shown in fig. 11(a) and (b) of modification 5, as in modification 1, the diameter D2 of the pulleys 41 and 43 is smaller than the diameter D1 of the pulley 42, and the diameter D2 of the pulleys 51 and 53 is smaller than the diameter D1 of the pulley 52. In modifications 4 and 5, as in modification 3, the center axis 42a of the driven pulley 42 is disposed on the movable belt unit 32 side with respect to a straight line L3 connecting the center axis 41a of the driving pulley 41 and the center axis 43a of the belt-extending pulley 43. The center axis 52a of the driven pulley 52 is disposed on the fixed belt unit 31 side with respect to a straight line L4 connecting the center axis 51a of the driving pulley 51 and the center axis 53a of the belt extending pulley 53.

In the above embodiment and modification 1, the pulleys 41 to 43 are disposed so that the central axes 41a to 43a are positioned on the same straight line L1, and the belt 44 is bent on the driven pulley 42 by the diameter difference (difference between D1 and D2) of the pulleys 41 to 43. Similarly, pulleys 51 to 53 are disposed so that the central axes 51a to 53a are positioned on the same straight line L2, and the belt 54 is bent on the driven pulley 52 by the difference in diameter between the pulleys 51 to 53 (difference between D1 and D2). In this case, if the difference in diameter between the pulleys 41 to 43 is small, the belt 44 may not be sufficiently bent on the driven pulley 42. Also, if the difference in diameter between the pulleys 51 to 53 is small, there is a fear that the belt 54 cannot be sufficiently bent on the driven pulley 52.

In contrast, in modifications 4 and 5, as described above, the central axis 42a of the driven pulley 42 is disposed offset from the straight line L3 connecting the central axis 41a of the driving pulley 41 and the central axis 43a of the belt-extending pulley 43. The center axis 52a of the driven pulley 52 is disposed offset from a straight line L4 connecting the center axis 51a of the driving pulley 51 and the center axis 53a of the belt-extending pulley 53. Therefore, in modifications 4 and 5, the belt 44 is bent on the driven pulley 42 by both the diameter difference of the pulleys 41 to 43 and the deviation of the center axis 42a from the straight line L3. Similarly, in modifications 4 and 5, the belt 54 is bent on the driven pulley 52 by both the diameter difference between the pulleys 51 to 53 and the deviation of the central axis 52a from the straight line L4. This enables the belts 44 and 54 to be reliably bent over the driven pulleys 42 and 52.

Further, the belt 44 in the modifications 4 and 5 is in contact with the driven pulley 42 on both sides of the movable belt unit 32 and the opposite side, but is not limited thereto. The belt 44 may be in contact with the driven pulley 42 only on the movable belt unit 32 side. Further, the belt 54 in the modifications 4 and 5 is in contact with the driven pulley 52 on both sides of the fixed belt unit 31 and the opposite side, but is not limited thereto. The belt 54 may be in contact with the driven pulley 52 only on the fixed belt unit 31 side.

Further, the relationship of the diameters of the pulleys 41 to 43 may be other than those in the modifications 3 to 5 as long as the belt 44 is bent on the driven pulley 42 on the movable belt unit 32 side. Similarly, the relationship of the diameters of the pulleys 51 to 53 may be other than those in the modifications 3 to 5 as long as the belt 54 is bent on the driven pulley 52 on the fixed belt unit 31 side.

In the above embodiment, the belts 44 and 54 are both bent by the driven pulleys 42 and 52 regardless of whether the belt 44 is in contact with the belt 54, but the present invention is not limited to this.

In modification 6, as shown in fig. 12(a), the diameters of the pulleys 41 to 43 are all the same D1 in the fixed belt unit 31, and the center axes 41a to 43a of the pulleys 41 to 43 are located on the same straight line L1. Similarly, as shown in fig. 12(b), the movable belt unit 32 has pulleys 51 to 53 all having the same diameter D1, and the central axes 51a to 53a of the pulleys 51 to 53 are positioned on the same straight line L2.

In this case, the belts 44, 54 are not bent at the driven pulleys 42, 52 in a state where the belts 44 and 54 are not in contact. Therefore, the belts 44, 54 do not closely contact the driven pulleys 42, 52. Therefore, when the belts 44 and 54 are driven, the driven pulleys 42 and 52 may not rotate.

However, even in this case, if the contact pressure of the belts 44, 54 is large to some extent in a state where the belts 44 and 54 are brought into contact, the belts 44, 54 bend on the driven pulleys 42, 52 and come into close contact with the driven pulleys 42, 52. Therefore, when the belts 44, 54 are caused to run, the driven pulleys 42, 52 rotate.

In the above embodiment, the belt false twisting device 24 is configured such that the movable belt unit 32 moves relative to the fixed belt unit 31 in a direction perpendicular to the mutually facing portions of the outer peripheral surfaces of the belts 44 and 54, and the belt 54 can move between a position in contact with the belt 44 and a position away from the belt 44, but the invention is not limited thereto. In modification 7, the movable belt unit 32 can swing between a position where the belt 54 contacts the belt 44 (a position indicated by a solid line in fig. 13) and a position where the belt 54 is separated from the belt 44 (a position indicated by a dashed-dotted line in fig. 13) around the center axis 51a of the driving pulley 51 as shown by an arrow G in fig. 13. Note that, since the mechanism for swinging the movable belt unit 32 is, for example, the same as the conventional one (see, for example, japanese patent application laid-open No. h 10-8335), detailed description thereof is omitted here.

However, in modification 7, as compared with the case of the above embodiment, the contact pressure between the belt 44 and the belt 54 causes a variation in the width direction of the belt 44. Specifically, the closer the portion of the belt 44 in the width direction to the center axis 51a, the greater the contact pressure of the belt 44 with the belt 54.

In the above embodiment, the bending angle θ of the belts 44 and 54 by the driven pulleys 42 and 52 is 0.5 degrees or more in the state where the belts 44 and 54 of the 2 belt units 31 and 32 are not in contact with each other, but is not limited thereto. The bending angle θ of the belts 44, 54 by the driven pulleys 42, 52 may be less than 0.5 degrees.

In the above embodiment, the end surface disk 45 is provided on the drive pulley 41 of the fixed belt unit 31, but the end surface disk 45 may be provided on the drive pulley 51 of the movable belt unit 32.

In the above embodiment, the driving pulley 41 and the driven pulley 42 of the fixed belt unit 31 are pulleys having the same diameter, but the diameter of the driving pulley 41 and the diameter of the driven pulley 42 are not limited to being completely the same. The diameter of the driving pulley 41 and the diameter of the driven pulley 42 may be slightly different to the extent that the diameters of these pulleys are substantially the same diameter (for example, a difference of 1% or less of a certain diameter of the pulleys 41 and 42). The same applies to the driving pulley 51 and the driven pulley 52 of the movable belt unit 32 of the above embodiment, and the pulleys having the same diameter constituting the respective belt units in the above modified examples.

In the above embodiment, the positional relationship between the rotating shafts 61 to 63 is fixed in the fixed belt unit 31, the positional relationship between the rotating shafts 71 and 72 is fixed in the movable belt unit 32, and the rotating shaft 73 is movable in the direction parallel to the straight line L2 with respect to the rotating shafts 71 and 72, but the present invention is not limited thereto.

For example, in the movable belt unit 32, the rotation shaft 73 may be movable in a direction inclined with respect to a straight line connecting the center shaft 51a and the center shaft 52a with respect to the rotation shafts 71 and 72. Further, the rotation shaft 73 is not limited to the linear movement. For example, the rotation shaft 73 may be moved to swing around a predetermined swing axis, or the rotation shaft 73 may be moved to tilt the rotation shaft 73 with respect to the rotation shafts 71 and 72.

In addition, the movable belt unit 32 may be configured such that the rotating shaft 73 is movable relative to the rotating shafts 71 and 72, and the fixed belt unit 31 may be configured such that the rotating shaft 63 is movable relative to the rotating shafts 62 and 63.

Alternatively, in contrast to the above embodiment, the positional relationship between the rotating shafts 61 and 62 may be fixed in the fixed belt unit 31, the rotating shaft 63 may be movable relative to the rotating shafts 61 and 62, and the positional relationship between the rotating shafts 71 to 73 may be fixed in the movable belt unit 32.

Further, the positional relationship between the rotating shafts 61 to 63 may be fixed in the fixed belt unit 31, and the positional relationship between the rotating shafts 71 to 73 may be fixed in the movable belt unit 32. In this case, for example, when the yarn Y is twisted by the belt false twisting device 24, the contact pressure between the belt 44 and the belt 54 is adjusted by moving the movable belt unit 32 in a direction perpendicular to the surface where the belt 44 and the belt 54 contact each other. This makes it possible to control the force with which the yarn Y is conveyed and the force with which the yarn Y is twisted.

In the above embodiment, in addition to the tension of the belt 54 being adjusted by moving the rotating shaft 73, the force for feeding the yarn Y and the force for imparting twist to the yarn Y may be controlled by moving the movable belt unit 32. In this case, the moving amount of the movable belt unit 32 can be reduced as compared with the case where the force for conveying the yarn Y is controlled only by moving the movable belt unit 32 to apply the force for twisting the yarn Y.

Claims (10)

1. A belt type false twisting device comprises 2 belt units, wherein the 2 belt units respectively comprise an annular belt, a driving pulley and a driven pulley for hanging the belt,

the bands of 2 of the band units are arranged crosswise to each other,

performing false twist processing on the yarn by running the belt in a state where the yarn is sandwiched between portions where the belts of the 2 belt units cross each other; is characterized in that the utility model is characterized in that,

one of the 2 belt units further includes a untwisting point fixing member that is provided on the drive pulley and rotates together with the drive pulley, and that contacts a portion of the yarn on a downstream side of the yarn path with respect to a portion sandwiched between the belts to suppress untwisting of the yarn and fix an untwisting start point,

each of the 2 belt units further includes a belt extension pulley disposed on the driven pulley on the opposite side to the driving pulley and configured to stretch and hang the belt;

the driven pulley bends the belt in any of a state where the belts of the 2 belt units are brought into contact with each other and a state where the belts of the 2 belt units are not brought into contact with each other,

the belts of 2 belt units cross each other at a central portion of a portion between the driving pulley and a portion bent by the driven pulley.

2. The belt false twisting device according to claim 1, wherein a bending angle of the belt by the driven pulley in a state where the belts of the 2 belt units are not in contact with each other is 0.5 degrees or more.

3. The belt false twisting device according to claim 1, wherein a diameter of the driving pulley is the same as or smaller than a diameter of the driven pulley,

the belt-extension pulley has a diameter smaller than that of the driven pulley.

4. The belt false twisting device according to claim 2, wherein the diameter of the driving pulley is the same as or smaller than the diameter of the driven pulley,

the belt-extension pulley has a diameter smaller than that of the driven pulley.

5. The belt false twisting device according to claim 3, wherein the shaft of the driven pulley is arranged as viewed in the axial direction of the driving pulley, the driven pulley and the belt extension pulley: the belt of 2 belt units is offset from a straight line connecting the shaft of the driving pulley and the shaft of the belt extension pulley to a side where the belts cross each other.

6. The belt false twisting device according to claim 4, wherein the shaft of the driven pulley is arranged as viewed in the axial direction of the driving pulley, the driven pulley, and the belt extension pulley: the belt of 2 belt units is offset from a straight line connecting the shaft of the driving pulley and the shaft of the belt extension pulley to a side where the belts cross each other.

7. The belt false twisting device according to claim 1, wherein the diameter of the driving pulley, the diameter of the driven pulley, and the diameter of the belt-extending pulley are the same,

the shaft of the driven pulley is arranged, as viewed in the axial direction of the drive pulley, the driven pulley, and the belt-extending pulley: is offset from a straight line connecting the shaft of the drive pulley and the shaft of the belt extension pulley.

8. The belt false twisting device according to claim 2, wherein the diameter of the driving pulley, the diameter of the driven pulley, and the diameter of the belt extension pulley are the same,

the shaft of the driven pulley is arranged, as viewed in the axial direction of the drive pulley, the driven pulley, and the belt-extending pulley: is offset from a straight line connecting the shaft of the drive pulley and the shaft of the belt extension pulley.

9. The belt false twisting device according to any one of claims 1 to 8, wherein in at least one of the 2 belt units,

the shaft of the driving pulley and the shaft of the driven pulley are fixed to each other,

the shaft of the belt extension pulley is configured to be movable with respect to the shaft of the driving pulley and the shaft of the driven pulley,

the belt extending device further includes a moving device for moving the shaft of the belt extending pulley relative to the shaft of the driving pulley and the shaft of the driven pulley.

10. A belt type false twisting device comprises 2 belt units, wherein the 2 belt units respectively comprise an annular belt, a driving pulley and a driven pulley for hanging the belt,

the belts of 2 belt units are arranged so as to cross each other at a central portion of a portion between the driving pulley and the driven pulley,

performing false twist processing on the yarn by running the belt in a state where the yarn is sandwiched between portions where the belts of the 2 belt units cross each other; is characterized in that the utility model is characterized in that,

one of the 2 belt units further includes a untwisting point fixing member that is provided on the drive pulley and rotates together with the drive pulley, and that contacts a portion of the yarn on a downstream side of the yarn path with respect to a portion sandwiched between the belts to suppress untwisting of the yarn and fix an untwisting start point,

each of the 2 belt units further includes a belt extension pulley disposed on the driven pulley on the opposite side to the driving pulley and configured to stretch and hang the belt;

in at least one of the 2 belt units,

the shaft of the driving pulley and the shaft of the driven pulley are fixed to each other,

the shaft of the belt extension pulley is configured to be movable with respect to the shaft of the driving pulley and the shaft of the driven pulley,

the belt extending device further includes a moving device for moving the shaft of the belt extending pulley relative to the shaft of the driving pulley and the shaft of the driven pulley.

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