JP2010065354A - Belt type false twister - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for achieving further stabilization of an untwisting point relative to the intersection of belts, and compaction of a device simultaneously. <P>SOLUTION: A belt type false twister 111 twists a yarn Y while nipping by traveling a reference belt 1 and a movable belt 2 while intersecting and pressure contacting each other. A drive pulley 10 about which the reference belt 1 is entrained is provided with an untwisting disc 50 having an outer circumferential edge 50a. The untwisting disc 50 is constituted to rotate together with the drive pulley 10. Outside diameter D of the untwisting disc 50 at the outer circumferential edge 50a thereof is set equal to or larger than a value obtained by adding the thickness of the reference belt 1 to the outside diameter of the drive pulley 10. The yarn handling area of the yarn Y on the downstream side of an intersection R is bent by contact with the outer circumferential edge 50a of the untwisting disc 50. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a belt type false twisting device, and more particularly to a technique for fixing an untwisting point.

  As this type of technology, Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-266179) discloses a false twisting machine provided with a yarn guide for untwisting a yarn immediately downstream of a nip point of a false twisting device. In this false twisting machine, as shown in FIG. 5 of Patent Document 1, a guide roller 8 is disposed at a position offset from the nip point N on the downstream side of the nip twister 7 (false twist device). . And, the presence of the guide roller 8 indicates that “the untwisting point can be stabilized at the position of the guide roller 8 even if the untwisting tension T2 is lowered, and the variation in the untwisted state in the longitudinal direction of the yarn Y is eliminated. And can prevent untwisting.

  Japanese Patent Application Laid-Open No. 58-23924 discloses a technique for preventing fluctuations in the untwisting point by bending a yarn immediately after passing through a belt. Specifically, a guide is provided that is positioned on a surface different from the belt contact surface at the belt intersection and that bends the yarn that has passed through the belt. According to this guide, “the untwisting point of the yarn is restricted to the final point of the belt intersection and does not move to the inside of the belt intersection”.

  Each of the techniques disclosed in Patent Documents 1 and 2 is useful for exhibiting a certain effect on the stability of the untwisting point relative to the intersection.

  The present invention has been made in view of such various points, and its main object is to provide a completely new configuration for fixing the untwisting point.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to the viewpoint of this invention, the belt type false twist apparatus comprised as follows is provided. That is, the belt-type false twisting device imparts twist while niping a yarn by running a pair of endless belts while crossing and press-contacting each other. A pulley around which the endless belt is wound is provided with an untwisting portion having an outer peripheral edge. The untwisting portion is configured to rotate together with the pulley. The outer diameter at the outer peripheral edge of the untwisted portion is set to be equal to or greater than the value obtained by adding the thickness of the endless belt to the outer diameter of the pulley. The yarn path of the yarn downstream of the intersection where the pair of endless belts intersect is bent by contact with the outer peripheral edge of the untwisting portion. According to the above configuration, since the peripheral speed at the outer peripheral edge of the untwisting portion exceeds the peripheral speed of the yarn in the intersecting portion, the twisting of the yarn applied at the intersecting portion is performed by the untwisting portion. It can be maintained until reaching the outer peripheral edge, so that the untwisting point of the yarn is fixed on the outer peripheral edge of the untwisting portion. Further, the configuration in which the outer diameter at the outer peripheral edge of the untwisting portion protrudes to the outer peripheral side from the endless belt allows the yarn path of the yarn in the section between the intersecting portion and the untwisting portion to be within the intersecting portion. It becomes possible to make it substantially in line with the yarn path of the yarn. When such a substantially straight yarn path is employed, uneven wear of the endless belt at the downstream end of the intersection is avoided.

  The belt-type false twisting device can employ the following configuration. That is, a case where the untwisting part is configured as a separate body from the pulley and a case where the untwisting part is configured integrally with the pulley can be considered. The former configuration is excellent in that only the untwisting portion can be replaced, and the latter configuration contributes to a reduction in the number of parts.

  The belt-type false twisting device can employ the following configuration. That is, a bending guide for guiding the yarn is provided so as to strengthen the bending of the yarn path at the outer peripheral edge of the untwisting portion. According to the above configuration, since the bending of the yarn path of the yarn at the outer peripheral edge of the untwisting portion is strengthened, the stability of the untwisting point of the yarn realized by this bending is realized at a higher level.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a drawing false twisting machine according to an embodiment of the present invention.

  In the present embodiment, the drawn false twisting machine 100 includes a yarn supplying unit 102 that supplies the yarn Y of the yarn supplying package 101, and a yarn that performs a drawing false twisting process on the yarn Y supplied from the yarn supplying unit 102. A weight configured to include a processing unit 103 and a winding unit 104 that winds the yarn Y that has been subjected to the drawing false twist processing by the yarn processing unit 103 to form a winding package P having a predetermined diameter. A plurality of 105 are provided. The plurality of weights 105 are juxtaposed in the direction perpendicular to the drawing sheet. For the purpose of making the drawn false twisting machine 100 compact, as shown in FIG. 1, the yarn feeding unit 102 and the winding unit 104 are arranged one above the other.

  The yarn supply package 101 is held by a peg 107 of a common creel stand 106 with a plurality of weights 105.

  The yarn processing unit 103 is arranged in the order along the traveling direction of the yarn Y, the first feed roller 108, the primary heater 109, the cooler 110, the belt type false twisting device 111, the second feed roller 114, the interface. A race nozzle 115, a secondary heater 116, and a third feed roller 117 are provided.

  The yarn feed speed of the second feed roller 114 is set larger than the yarn feed speed of the first feed roller 108 so that the yarn Y is stretched between the first feed roller 108 and the second feed roller 114. The On the other hand, the yarn feed speed of the third feed roller 117 is smaller than the yarn feed speed of the second feed roller 114 so that the yarn Y is relaxed between the second feed roller 114 and the third feed roller 117. Is set.

  The belt-type false twisting device 111 applies twist to the traveling yarn Y while niping the traveling yarn Y by traveling in a state where the pair of endless belts are crossed and pressed against each other. The twist propagates from the belt type false twisting device 111 to the first feed roller 108 toward the upstream side in the running direction of the yarn Y. The yarn Y is heat-set by the primary heater 109 while being twisted while being drawn, then cooled by the cooler 110 and untwisted when passing through the belt type false twisting device 111. The yarn Y that has been subjected to the drawing false twisting process is provided with a converging property equivalent to that of the twisted yarn by appropriately forming an entangled portion in the interlace nozzle 115. Thereafter, the yarn Y is subjected to a predetermined heat treatment in the secondary heater 116 in a relaxed state, and is wound as a winding package P in the winding unit 104.

  Next, the belt type false twisting device 111 will be described. FIG. 2 is a side view of a belt type false twisting device according to an embodiment of the present invention. 3 is a cross-sectional view taken along line 3-3 in FIG. FIG. 4 is a schematic view of a yarn path in the belt type false twisting device.

  As shown in FIG. 2, the belt type false twisting device 111 includes a reference belt 1 as a reference side belt and a movable belt 2 as a movable side belt, and the reference belt 1 and the movable belt 2 described above. The yarn Y that travels while being sandwiched between the reference belt 1 and the movable belt 2 is twisted by being moved closer to each other. That is, the belt type false twisting device 111 includes a reference belt unit 3 including the reference belt 1 and a movable belt unit 4 including the movable belt 2. Since the reference belt unit 3 and the movable belt unit 4 have a substantially symmetrical structure, the structure of the movable belt unit 4 will be mainly described in detail below.

  The movable belt unit 4 includes a unit base 5 fixed to the main body of the drawing false twisting machine 100, a movable belt support 6 slidable with respect to the unit base 5, and the movable belt 2. Composed. The movable belt support 6 is arranged at the drive unit 7 accommodated in the unit base 5, the pulley drive shaft housing cylinder 8 protruding from the drive unit 7, and the tip of the pulley drive shaft housing cylinder 8, A drive pulley 10 that is rotationally driven by a drive shaft (not shown) housed in the pulley drive shaft housing cylinder 8 and a driven pulley 11 that forms a pair with the drive pulley 10 and on which the movable belt 2 is hung together with the drive pulley 10. And a tension applying unit 12 for applying a predetermined tension to the movable belt 2 hung on the drive pulley 10 and the driven pulley 11 as a main configuration. The tension applying unit 12 includes a driven coil support body 9 that rotatably supports the driven pulley 11 and a compression coil spring 13 (not shown) that is interposed between the pulley drive shaft housing cylinder 8. The

  In this embodiment, the movable belt 2 hung on the driving pulley 10 and the driven pulley 11 is an endless belt having flexibility, and the belt width is approximately 8 to 12 [mm]. The pulley drive shaft housing cylinder 8 extends substantially toward the reference belt unit 3 so that the movable belt 2 supported by the movable belt unit 4 can come into contact with the reference belt 1 supported by the reference belt unit 3. Is done. When the reference belt 1 and the movable belt 2 sandwich the yarn Y, the reference belt facing surface 1a as a portion of the reference belt 1 that faces the movable belt 2 and the reference belt 1 as shown in FIG. The movable belt facing surface 2a as a portion of the movable belt 2 that faces is substantially parallel. In the present embodiment, the movable belt 2 is configured to be able to advance and retreat with respect to the reference belt 1 while maintaining a parallel relationship between the reference belt facing surface 1a and the movable belt facing surface 2a. That is, the drive unit 7 of the movable belt support 6 that supports the movable belt 2 is configured to slide in a direction perpendicular to the movable belt facing surface 2 a in the unit base 5.

  As shown in FIG. 3, a guide shaft 15 (not shown) is inserted in the unit base 5 along a direction perpendicular to the movable belt facing surface 2a, and the guide shaft 15 and a linear bushing (not shown) are interposed therebetween. The drive unit 7 is connected to the unit base 5. With this configuration, the movable belt 2 can be moved back and forth with respect to the reference belt 1 while maintaining a parallel relationship between the reference belt facing surface 1a and the movable belt facing surface 2a. In addition, a key groove 16 extending in parallel with the insertion direction of the guide shaft 15 is formed in the driving unit 7, and a key 17 accommodated in the key groove 16 is provided in the unit base 5. Due to the presence of the keyway 16 and the key 17, the rotation of the drive unit 7 around the guide shaft 15 is restricted. The pulley drive shaft housing cylinder 8 is inserted into the drive unit 7 as shown in the figure, and the drive shaft 9 connected to the drive pulley 10 is substantially coaxial with the pulley drive shaft housing cylinder 8. It is said.

  The unit base 5 includes a movable belt proximity urging portion 18 (movable belt proximity urging means) that urges the movable belt 2 in the direction A close to the reference belt 1 and a direction B away from the reference belt 1. A movable belt separating and urging unit 19 that urges the movable belt 2 and a movable belt moving unit 20 (movable belt moving unit) that moves the movable belt 2 in the direction B away from the reference belt 1 are provided.

  The movable belt proximity urging unit 18 is configured to be pneumatic in the present embodiment, so that the urging force applied to the movable belt 2 can be increased or decreased. Specifically, the movable belt proximity urging portion 18 is driven by air supply port 21 connected to a compressed air supply device (not shown) and compressed air supplied via the air supply port 21. The movable belt proximity urging unit main body 22 containing the bellophram and an output rod 23 interlocking with the operation of the bellophram are configured. The output rod 23 is arranged so as to be parallel to the insertion direction of the guide shaft 15, and is formed in the drive unit 7 when compressed air is supplied to the movable belt proximity urging unit main body 22 through the air supply port 21. The pressure abutting on the rod abutting surface 7 a and the pressure acting on the output rod 23 by the compressed air via the bellophram is transmitted to the drive unit 7. The movable belt proximity urging unit 18 is used to urge the movable belt 2 in the direction A in which the pressure (air pressure) transmitted to the drive unit 7 approaches the reference belt 1. Composed. That is, the direction in which the reference belt 1 is desired from the movable belt 2 and the direction in which the output rod 23 or the rod contact surface 7a is desired from the movable belt proximity biasing body 22 are the same direction.

  The movable belt separating and urging portion 19 is configured as a spring type in the present embodiment, and specifically, is supported by the unit base 5 in such a manner that it can slide in a direction parallel to the insertion direction of the guide shaft 15. A spring accommodating body 24, a compression coil spring 25 interposed between the spring accommodating body 24 and the drive unit 7, and a screw for moving the spring accommodating body 24 back and forth in a direction parallel to the insertion direction of the guide shaft 15. And an eccentric cam 26. The spring accommodating body 24, the compression coil spring 25, and the driving unit 7 are configured so that the self-elastic restoring force of the compression coil spring 25 interposed between the spring accommodating body 24 and the driving unit 7 causes the movable belt 2 to move from the reference belt 1. It arrange | positions so that it may serve for energizing to the direction B to separate. Accordingly, the urging force applied to the movable belt 2 by the movable belt proximity urging unit 18 and the urging force applied to the movable belt 2 by the movable belt separation urging unit 19 act in opposite directions. Configured to do. The screw type eccentric cam 26 moves the spring accommodating body 24 forward and backward in a direction parallel to the insertion direction of the guide shaft 15, thereby applying an urging force applied to the movable belt 2 by the movable belt separating and urging portion 19. It is for adjusting.

  The movable belt moving unit 20 is configured as a cam drive type in the present embodiment, and specifically, is supported by the unit base 5 in such a manner that it can slide in a direction parallel to the insertion direction of the guide shaft 15. The advancing rod 27 has a notch that engages with the advancing rod 27 at the tip, and a cam type knob 28 for advancing the advancing rod 27. The advancing direction of the advancing rod 27 by the cam type knob 28 is set to the same direction as the direction in which the movable belt 2 is separated from the reference belt 1, and when the advancing rod 27 is advanced by engagement with the cam type knob 28, the advancing rod 27 advances. The rod 27 is in contact with the drive unit 7, and the movable belt 2 is configured to be separated from the reference belt 1 through the drive unit 7. A compression coil spring 29 is provided between the advance rod 27 and the unit base 5 so that when the advance rod 27 is released from the cam type knob 28, the advance rod 27 is retracted in a direction away from the drive unit 7 in a short time. It is installed.

  As shown in FIGS. 2 and 4, an untwisting disk 50 (untwisting portion) having an outer peripheral edge 50a is connected and fixed to the drive pulley 10 of the reference belt unit 3 by fastening means such as a bolt (not shown). The untwisting disk 50 is, for example, a rigid body such as stainless steel or ceramic, and is fixed to the driving pulley 10 to rotate together with the driving pulley 10. In other words, the untwisting disk 50 rotates positively. And the outer diameter D of the outer periphery 50a of this untwisting disk 50 is set more than the value obtained by adding the thickness of the reference belt 1 twice to the outer diameter of the drive pulley 10. FIG. In other words, the outer diameter D of the outer peripheral edge 50a of the untwisting disk 50 is such that it protrudes (protrudes) further to the outer peripheral side than the reference belt 1 wound around the drive pulley 10, as shown in FIG. Is set. With this configuration, the yarn path of the yarn Y on the downstream side of the intersection R where the pair of the reference belt 1 and the movable belt 2 intersects, as shown in this figure, is the outer peripheral edge 50a of the untwisting disk 50. It is bent by the contact. As shown in the figure, this contact is not a linear contact along the outer peripheral edge 50a of the untwisting disk 50 but a point contact characterized by the intersection of the yarn Y and the outer peripheral edge 50a. . In the present embodiment, a tapered outer peripheral surface 50b that is narrowed toward the downstream side of the yarn path of the yarn Y is formed near the outer peripheral edge 50a of the untwisting disc 50 as shown in FIG. And the thread | yarn Y is comprised so that contact friction is possible with respect to this taper outer peripheral surface 50b. The contact between the taper outer peripheral surface 50b and the yarn Y is a line contact when viewed microscopically.

  Further, as shown in FIG. 2, a bending guide 51 having a substantially V-shaped cross section that is driven to rotate with respect to the traveling yarn Y is provided on the downstream side of the untwisting disk 50. The bending guide 51 enhances the bending of the yarn path of the yarn Y at the outer peripheral edge 50a of the untwisting disk 50. That is, as shown in FIG. 4, the yarn Y nipped and fed by the reference belt 1 and the movable belt 2 is bent on the outer peripheral edge 50a of the untwisting disk 50 through a little travel, and further slightly. After traveling, the bending guide 51 is bent in the direction substantially opposite to the above bending.

  Next, the operation of the belt type false twisting device 111 according to this embodiment will be described.

  First, a gap that is sufficiently larger than the thickness of the yarn Y to be twisted exists between the reference belt 1 and the movable belt 2, and this yarn Y is in the direction indicated by the thick line arrow shown in FIG. Assume that you are traveling.

<Start of twisting>
In order to start twisting the yarn Y in this state, first, the drive pulley 10 is rotated at a predetermined rotational speed by a motor (not shown), and the movable belt 2 is caused to travel at a predetermined speed. The traveling direction of the movable belt 2 is a direction indicated by a thick line arrow in the drawing. The same applies to the reference belt unit 3.

  Next, compressed air having a predetermined pressure is introduced into the movable belt proximity biasing portion 18 shown in FIG. As a result, the output rod 23 comes into contact with the rod contact surface 7a of the drive unit 7, and the pressure received by the output rod 23 from the movable belt proximity biasing unit main body 22 is transmitted to the drive unit 7, whereby the drive unit 7 is The movable belt 2 slides along the insertion direction of the guide shaft 15 so as to resist the self-elastic restoring force of the compression coil spring 25 belonging to the movable belt separating and urging portion 19. Close to each other. Eventually, when the movable belt 2 comes into contact with the yarn Y, the pressure received by the output rod 23 from the movable belt proximity biasing body 22 is the contact pressure of the movable belt 2 against the yarn Y (the contact of the reference belt 1 against the yarn Y). Pressure).

  Both the running directions of the reference belt 1 and the movable belt 2 have a predetermined angle with respect to the yarn Y. Therefore, the running of the reference belt 1 and the movable belt 2 has a function of sending the yarn Y; A function of imparting twisting torque to the yarn Y.

<Stopping twisting: 1>
When the twisting of the yarn Y is stopped in the above state, first, the supply of compressed air to the movable belt proximity urging unit 18 is stopped, and the compression already supplied to the movable belt proximity urging unit 18 is stopped. By removing the air, the urging force applied to the drive unit 7 by the movable belt proximity urging unit 18 is eliminated. Then, the contact pressure of the movable belt 2 against the yarn Y disappears, and the driving unit 7 separates the movable belt 2 from the reference belt 1 by the biasing force applied to the driving unit 7 by the movable belt separation biasing unit 19. In this direction, the gap between the reference belt 1 and the movable belt 2 is sufficiently large as compared with the thickness of the yarn Y, and the twisting of the yarn Y is stopped.

<Stop of twisting: 2>
For example, when the reference belt 1 or the movable belt 2 is replaced, the cam type knob 28 may be rotated as appropriate. According to this, the advance rod 27 is advanced by engagement with the cam type knob 28, and the drive unit 7 is moved (retracted) in the direction in which the movable belt 2 is separated from the reference belt 1, and the reference belt 1 and the movable belt are moved. This is because a sufficiently large gap is generated between the two. In other words, when the urging force is applied to the drive unit 7 by the movable belt proximity urging unit 18, the advancement / retraction of the drive unit 7 along the insertion direction of the guide shaft 15 is alternatively, The amount of advancement of the advancement rod 27 or the urging force applied to the drive unit 7 by the compression coil spring 25 is controlled. On the other hand, when the urging force is not applied to the drive unit 7 by the movable belt proximity urging unit 18, the advancement / retraction of the drive unit 7 along the insertion direction of the guide shaft 15 is performed by the compression coil spring 25. 7 will be governed by the urging power given to 7.

<Adjustment of contact pressure>
By the way, when twisting the yarn Y, the contact pressure of the movable belt 2 against the yarn Y (reference belt 1 against the yarn Y) generated by supplying compressed air with a predetermined pressure to the movable belt proximity biasing portion 18. In order to adjust the contact pressure, the screw type eccentric cam 26 may be rotated in any direction. That is, when twisting the yarn Y, the urging force applied to the drive unit 7 by the movable belt proximity urging unit 18 is the contact pressure of the movable belt 2 against the yarn Y and the movable belt separating urging unit 19. In this relationship, when the screw type eccentric cam 26 is rotated in either direction, the movable belt separating biasing portion 19 causes the movable belt separating biasing portion 19 to rotate. This is because the biasing force applied to the drive unit 7 increases and decreases, and the contact pressure of the movable belt 2 with respect to the yarn Y changes relatively. The contact pressure adjustment (depending on the type of yarn) of the whole (for example, 240 spindles per machine) is performed all at once by changing the air pressure. The adjustment by the screw type eccentric cam 26 is used to measure the contact pressure after the above-described adjustments performed at the same time, and to adjust when the contact pressure varies between the weights.

<Operation of Untwisting Disc 50>
Next, based on FIG.5 and FIG.6, the effect | action of said untwisting disk 50 is demonstrated in detail. FIG. 5 is a diagram showing untwisting points when the untwisting tension T2 is low. FIG. 6 is a diagram showing an untwisting point when the untwisting tension T2 is high. 5 and 6, the yarn Y existing in the above-described intersecting portion R cannot be seen in a normal state, but in order to explain the position of the untwisting point, it is intentionally placed on the front side of the reference belt 1. Painted.

  When the untwisting tension T2 is low, the untwisting point is located at the downstream end of the intersection R between the reference belt 1 and the movable belt 2 as shown in FIG. However, when the untwisting tension T2 is high, the untwisting point enters the intersection R between the reference belt 1 and the movable belt 2 as shown in FIG. As a result, the untwisted yarn Y rubs against the reference belt 1 and the movable belt 2 to cause fuzz. On the other hand, in the configuration of the above embodiment including the untwisting disk 50, as shown in FIGS. 5B and 6B, the untwisting point is always set regardless of the level of the untwisting tension T2. It is fixed on the outer peripheral edge 50a of the untwisting disk 50. Therefore, since the untwisting point does not enter the intersection R between the reference belt 1 and the movable belt 2, the occurrence of fuzz can be suppressed.

  Furthermore, since the bending of the yarn path of the yarn Y in the untwisting disk 50 is strengthened by the presence of the bending guide 51, the stability of the untwisting point of the yarn Y is realized at a higher level.

  Next, the test for confirming the technical effect of said untwisting disk 50 is demonstrated. In Table 1 below, the example is related to the configuration in which the untwisting disk 50 is added to the configuration shown in FIG. 5A, and the comparative example is related to the configuration shown in FIG. In Table 1 below, Test No. The yarn types 1 to 3 are 75 den / 144f, and the yarn speed is 600 m / min. Test No. The yarn types 4-6 are 150 den / 288f, and the yarn speed is 600 m / min. In the table, “untwisting tension T2 gr” means the tension of the yarn Y on the downstream side of the belt type false twisting device 111, and the unit gr means gram. “BF / 1000 m” means the number of fluffs per 1000 m.

  According to the comparative example in Table 1 above, it can be seen that when the untwisting tension T2 is high, the occurrence of fluff is significant. And in the Example which employ | adopted said untwisting disk 50, it turns out that the number of fluff was restrained by about half as compared with the comparative example irrespective of the magnitude | size of untwisting tension T2. Since fluff generally occurs when the untwisting point enters between the belts, in the above embodiment, the entry of the untwisting point between the belts is suppressed, which is nothing but the untwisting point is stable. It is thought that it was because it was fixed.

(Summary)
As described above, in the embodiment, the belt type false twisting device 111 is configured as follows. That is, the belt-type false twisting device 111 imparts twist while niping the yarn Y by running the reference belt 1 and the movable belt 2 in a state of crossing and pressing each other. A drive pulley 10 around which the reference belt 1 is wound is provided with an untwisting disk 50 having an outer peripheral edge 50a. The untwisting disk 50 is configured to rotate together with the drive pulley 10. The outer diameter D at the outer peripheral edge 50 a of the untwisting disk 50 is set to be equal to or greater than the value obtained by adding the thickness of the reference belt 1 to the outer diameter of the drive pulley 10. The yarn path of the yarn Y on the downstream side of the intersection R is bent by contact with the outer peripheral edge 50a of the untwisting disc 50. According to the above configuration, since the peripheral speed at the outer peripheral edge 50a of the untwisting disk 50 exceeds the peripheral speed of the yarn Y in the intersection R, the twist of the yarn Y applied at the intersection R Can be maintained up to the outer peripheral edge 50a of the untwisting disk 50, and the untwisting point of the yarn Y is fixed on the outer peripheral edge 50a of the untwisting disk 50. The yarn path of the yarn Y in the section between the intersecting portion R and the untwisting disk 50 is configured such that the outer diameter D of the outer peripheral edge 50a of the untwisting disk 50 protrudes to the outer peripheral side from the reference belt 1. Can be made substantially in line with the yarn path of the yarn Y in the intersecting portion R. When such a substantially straight yarn path is employed, uneven wear of the reference belt 1 and the movable belt 2 at the downstream end of the intersection R is avoided.

  In the above embodiment, the yarn path of the yarn Y in the section between the intersecting portion R and the untwisting disk 50 is substantially aligned with the yarn path of the yarn Y in the intersecting portion R. An outer diameter D at the outer peripheral edge 50a of the untwisting disk 50 is set.

  For example, when the untwisting disk 50 is configured not to actively rotate but to rotate by contact with the yarn Y, the peripheral speed at the outer peripheral edge 50a of the untwisting disk 50 is within the intersection R. Therefore, the twist of the yarn Y applied at the intersecting portion R cannot be maintained until the outer peripheral edge 50a of the untwisting disk 50 is reached. Further, even if the untwisting disk 50 is positively rotated, the peripheral speed at the outer peripheral edge 50a of the untwisting disk 50 is not rotated so high that it exceeds the peripheral speed of the yarn Y in the intersection R. In such a case, the twist of the yarn Y applied at the intersecting portion R cannot be completely maintained until the outer peripheral edge 50a of the untwisting disk 50 is reached.

  The belt-type false twisting device 111 can employ the following configuration. That is, a bending guide 51 for guiding the yarn Y is provided so as to strengthen the bending of the yarn path of the yarn Y at the outer peripheral edge 50a of the untwisting disk 50. According to the above configuration, since the bending of the yarn path of the yarn Y at the outer peripheral edge 50a of the untwisting disk 50 is strengthened, the stability of the untwisting point of the yarn Y realized by this bending is realized at a higher level. Is done.

  Although the preferred embodiments of the present invention have been described above, the above embodiments can be implemented with the following modifications.

  FIG. 7 is a view similar to FIG. 2 and showing another embodiment of the present invention. As shown in this figure, instead of the untwisting disk 50 according to the above embodiment, an annular protrusion 52 (untwisting portion) is provided on the outer peripheral surface of the driven pulley 11 of the movable belt unit 4. Also good. In other words, instead of the untwisting disk 50 that is a separate body from the drive pulley 10, a ridge 52 that is integral with the driven pulley 11 may be employed. That is, the untwisting parts such as the untwisting disk 50 and the protrusion 52 may be separate from or integral with the pulleys (10, 11). The structure in which the untwisting part is separate is excellent in that only the untwisting part can be replaced, and the structure in which the untwisting part is integrated contributes to a reduction in the number of parts. In any case, the untwisting point can be fixed when the untwisting tension T2 is high as shown in FIG. 6B. Also in this case, it is preferable to provide a bending guide for guiding the yarn Y so as to strengthen the bending of the yarn path of the yarn Y by the protrusion 52 as in the above embodiment.

Schematic configuration diagram of a drawing false twisting machine according to an embodiment of the present invention The side view of the belt type false twist device concerning one embodiment of the present invention. Sectional view taken along line 3-3 in FIG. Schematic of yarn path in belt type false twisting device The figure which shows the untwisting point in case untwisting tension T2 is low The figure which shows the untwisting point in case untwisting tension T2 is high FIG. 3 is a view similar to FIG. 2 and showing another embodiment of the present invention.

Explanation of symbols

1 reference belt 2 movable belt 10 drive pulley 11 driven pulley 50 untwisting disk 111 belt type false twisting device

Claims (4)

A belt-type false twisting device that applies twist while niping a yarn by running a pair of endless belts in a state of crossing and pressure-contacting each other,
The pulley around which the endless belt is wound is provided with an untwisting portion having an outer peripheral edge,
The untwisting portion is configured to rotate together with the pulley,
The outer diameter of the outer peripheral edge of the untwisted portion is set to be equal to or greater than the value obtained by adding the thickness of the endless belt to the outer diameter of the pulley,
The yarn path of the yarn on the downstream side of the intersecting portion where the pair of endless belts intersect is bent by contact with the outer peripheral edge of the untwisting portion,
A belt type false twisting device. The belt type false twisting device according to claim 1,
The untwisting part is configured as a separate body from the pulley,
A belt type false twisting device. The belt type false twisting device according to claim 1,
The untwisting part is configured integrally with the pulley,
A belt type false twisting device. The belt type false twisting device according to any one of claims 1 to 3,
A bending guide is provided for guiding the yarn so as to strengthen the bending of the yarn path of the yarn at the outer periphery of the untwisting portion;
A belt type false twisting device.

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