JP2009209475A - Twister - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the quality of a doubled yarn formed just after the start of operation, and to prevent yarn break just after the start of the operation by forming a balloon of an outer yarn in early stage. <P>SOLUTION: A tension-imparting device 5 for imparting the tension to the outer yarn Y2 is installed. The tension-imparting device 5 is constituted so as to enable to change the tension to be imparted to the outer yarn Y2. A tension control part 51 for controlling the tension-imparting device 5 is also installed so that a tension smaller than the tension to be imparted to the outer yarn Y2 at normal operation may be imparted to the outer yarn Y2 during the period from the starting time of the operation to the time after passing a prescribed time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a twisting machine for twisting two yarns.

  Generally, in a twisting machine for twisting two yarns, twisting is performed as follows. That is, one of the two yarns to be twisted (hereinafter referred to as an inner yarn) is, for example, a yarn supply package formed in a cylindrical cheese winding (hereinafter referred to as an inner yarn supply package). Is unraveled in the axial direction. The other yarn (hereinafter referred to as an outer yarn) is unwound from another yarn supplying package (hereinafter referred to as an outer yarn supplying package) supported slightly apart from the yarn supplying package, and the inner yarn While being applied with a predetermined tension by a tension applying device disposed on the yarn path leading to the inner thread, the inner yarn is twisted together while forming a balloon on the outer peripheral side of the inner yarn supplying package.

  In order to form the outer yarn balloon on the outer peripheral side of the inner yarn supplying package, one end of the inner yarn supplying package is provided on the outer side in a direction perpendicular to the axis of the inner yarn supplying package. A spindle on which a yarn path for the yarn is formed is provided. When the spindle is rotated by a motor, the outer yarn to be fed in the spindle is swung around the axis of the inner yarn supplying package, thereby forming the outer yarn balloon.

  In addition to the above configuration, a contact prevention ring having a diameter larger than the package diameter of the inner yarn supplying package is provided so that the outer yarn does not directly contact the inner yarn supplying package. It is interposed between yarn supply packages for yarn.

  With the above configuration, in order to start the operation of the twisting machine, the operator unwinds the outer yarn from the outer yarn supply package, and uses the above-described tension applying device, the yarn path in the spindle, and the inner yarn. After passing through the yarn guide where the outer yarn joins, the inner yarn and the outer yarn are introduced into the winding device. At this time, the outer yarn is in contact with the contact prevention ring with a predetermined tension from the yarn path in the spindle to the yarn guide. Then, the operator starts winding by the winding device and rotation of the spindle at the same time, and when the rotation speed of the spindle reaches a predetermined rotation speed, the outer thread is separated from the contact prevention ring to the outer peripheral side by centrifugal force. Thus, a balloon having a predetermined diameter is formed.

  However, among the yarns produced by the above-described twisting machine, the user has complained about the quality of the yarn produced immediately after the start of operation and the yarn breakage immediately after the start of operation. Therefore, as a result of the investigation on the quality and thread breakage, the inventor of the present application has not formed a balloon until a considerable time has elapsed from the start of operation, and the outer thread continues to rub against the contact prevention ring. I found out that it was. And, after extensive research, the outer thread cannot form a balloon until a considerable time has elapsed from the start of operation. (A) It takes a considerable amount of time for the rotation speed of the spindle to reach a predetermined rotation speed. (B) As long as the rotational speed of the spindle is small, the centrifugal force acting on the outer thread is also small, and the outer thread cannot overcome the tension applied to itself and begin to form a balloon. (C) Conventional twisting machine Then, it was found that (a) to (c) of the fact that a considerable amount of tension had already been applied to the outer yarn from the start of operation strongly influenced. The considerable amount of tension in (c) above is a fixed value set on the assumption that the balloon is sufficiently formed during steady operation, and was reasonable in a sense.

  The present invention has been made in view of such various points, and its main purpose is to form an outer yarn balloon at an early stage, thereby improving the quality of the synthetic yarn generated immediately after the start of operation and driving. It is to prevent thread breakage immediately after starting.

  Patent Document 1 (Japanese Patent Laid-Open No. 2002-138331) discloses a tension control means for controlling the tension of a thread so as not to cause thread breakage. This tension control means is disclosed in Patent Document 1 above. As described in Paragraph No. 0039, it seems to be for dealing with the harmful effects caused by the introduction of a positive rotating flyer. Although the subject of interest is considerably different from the present application, the technical information of Patent Document 1 is interesting.

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 an aspect of the present invention, the inner yarn and the outer yarn are twisted by feeding the outer yarn on which the balloon is formed by the spindle rotated by the driving source on the outer peripheral side of the package that supplies the inner yarn. The twisting machine is configured as follows. The twisting machine includes tension applying means for applying tension to the outer yarn, and tension control means for controlling the operation of the tension applying means. The tension applying means is configured to be able to change the tension applied to the outer thread. The tension control means controls the operation of the tension applying means so as to change the tension applied to the outer thread in accordance with the rotation state of the spindle. As described above, according to the above-described configuration, which the present inventor has conceived by paying attention to the relationship between the formation of the balloon and the tension, the formation of the balloon of the outer thread can be controlled.

  The above-described twisting machine is further configured as follows. That is, the tension control means applies a tension smaller than the tension applied to the outer thread during steady operation until the spindle reaches a predetermined speed after the spindle starts rotating. The operation of the tension applying means is controlled so as to be applied to the outer thread. According to the above configuration, the balloon of the outer yarn is formed at an early stage, so that the quality of the combined yarn generated immediately after the start of operation is improved and yarn breakage immediately after the start of operation is prevented. Furthermore, even before the outer yarn balloon is formed, the tension of the outer yarn that rubs against other parts such as a package for supplying the inner yarn is small, so that in this respect as well, It can be said that the quality of the thread is improved and yarn breakage immediately after the start of operation is prevented.

  The above-described twisting machine is further configured as follows. That is, the tension applying means includes a driven pulley that is driven to rotate by winding the outer thread and feeding the outer thread, and a rotation suppressing means for suppressing the rotation of the driven pulley. The According to the above structure, the structure which provides tension | tensile_strength with respect to the said outer thread is considered, considering the quality of the said outer thread.

  The above-described twisting machine is further configured as follows. That is, the rotation suppression means is an electromagnetic brake that suppresses the rotation of the driven pulley by magnetic friction. According to the above configuration, the degree of suppression of rotation of the driven pulley can be easily controlled. Furthermore, since the configuration uses magnetic friction, a configuration in which the sliding portion is omitted is possible, thereby reducing the maintenance burden.

  The above-described twisting machine is further configured as follows. That is, the driven pulley is configured such that the outer thread wound around the driven pulley is alternately pressed along the circumferential direction of the driven pulley in different directions. According to the above configuration, the quality of the outer yarn is higher than that in the configuration in which the driven pulley that is driven to rotate by feeding the outer yarn with a simple contact resistance with the outer yarn. Deterioration can be reduced.

  The above-described twisting machine is further configured as follows. That is, the tension applying means is disposed on the front side of the twisting machine. According to the above configuration, the workability of winding the outer thread around the driven pulley constituting the tension applying means is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, based on FIG. 1, the structure of the twisting machine which concerns on one Embodiment of this invention is outlined. FIG. 1 is a schematic configuration diagram of a twisting machine according to an embodiment of the present invention.

  The twisting machine 100 according to the present embodiment includes a plurality of twisting units 1 arranged in series, and a machine control device 2 that controls the operation of the plurality of twisting units 1. The twisted yarn unit 1 twists two yarns, and only one twisted yarn unit 1 among the plurality of twisted yarn units 1 is depicted in front view in FIG.

  The twisting yarn unit 1 supports a yarn supplying package (hereinafter referred to as an inner yarn supplying package P1) that supplies one of the two yarns to be twisted (hereinafter referred to as an inner yarn Y1). Yarn supply package support portion 3 and an external yarn supply that supports the other yarn (hereinafter referred to as outer yarn Y2) and a yarn supply package that supplies the other yarn (hereinafter referred to as outer yarn Y2). The yarn package support 4, a tension applying device 5 (tension applying means) for applying tension to the outer yarn Y 2, and winding to wind up the combined yarn Y as a yarn in which the inner yarn Y 1 and the outer yarn Y 2 are twisted together And a device 6. A balloon forming device 7 for forming a balloon of the outer yarn Y2 on the outer peripheral side of the inner yarn supplying package support portion 3 is provided coaxially on the upstream side of the inner yarn supplying package support portion 3. Hereinafter, the configuration of the twist unit 1 will be further described along the yarn path from the outer yarn Y2 sent from the outer yarn supply package P2 to the winding device 6.

  The outer yarn Y2 unwound from the outer yarn supply package P2 that is non-rotatably supported by the outer yarn supply package support portion 4 has a function of applying a slight tension to the outer yarn Y2. It is introduced into the tension applying device 5 through the yarn guide 8, the gate type tensioner 9 for applying a predetermined tension to the outer yarn Y2, and the second yarn guide 10. The detailed configuration of the tension applying device 5 will be described later.

  The outer yarn Y2 to which a suitable tension is applied by the tension applying device 5 is introduced into the balloon forming device 7 so as to be sucked up in the vertical direction through the third yarn guide 11 and the fourth yarn guide 12 in order. Is done. The balloon forming device 7 includes an electric motor 14 having a spindle 13 as an output shaft, and a disk 15 fixed to the spindle 13 so as not to rotate. Reference is now made to FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. As shown in FIG. 2A, a thread path 16 through which the outer thread Y2 can pass is formed coaxially in the axis of the spindle 13, and a thread path 17 extending in the radial direction from the thread path 16 is formed. It is formed in the immediate vicinity of the lower surface of the disk 15. Then, the outer yarn Y2 guided into the yarn path 16 of the spindle 13 through the fourth yarn guide 12 is sent to the outside of the spindle 13 through the yarn path 17, and is shown in FIG. 2 (b). As described above, the disk 15 is rotated by the electric motor 14 via the spindle 13, so that the outer thread Y <b> 2 is swung while drawing a vortex along the lower surface of the disk 15. In the bottom view of FIG. 2B, the angle of the vortex drawn by the outer yarn Y2 sent from the yarn path 17 is generally referred to as a delay angle θ [deg.].

  Please refer to FIG. 1 again. As shown in FIG. 1, the outer thread Y2 delivered from the spindle 13 is further guided to the outer periphery so as to crawl the lower surface of the disk 15, and leaves the balloon forming device 7 from the outer peripheral edge of the disk 15 to feed the inner thread. The yarn is guided to the winding device 6 while being guided so as to avoid the yarn feeding package P1 for the inner yarn supported by the yarn package support portion 3.

  Here, the configuration of the inner yarn supplying package support portion 3 will be briefly described. The inner yarn supplying package support portion 3 is pivotally supported on the spindle 13 via a bearing (not shown) and is disposed on the outer peripheral side of the inner yarn supplying package support portion 3. The rotation is restricted by the magnetic coupling with the magnet. The inner yarn supplying package support portion 3 supports the inner yarn supplying package P1 so that the inner yarn supplying package P1 does not rotate with respect to the inner yarn supplying package support portion 3, and feeds it from below. The diameter of the outer yarn Y2 to be threaded is larger than that of the inner yarn supply package P1 so as to be adjacent to the lower side in the axial direction with respect to the disk 15 so that the outer yarn Y2 is not in contact with the inner yarn supply package P1. The hat 18 is provided. Similarly, on the opposite side of the hat 18 and the inner yarn supply package P1, the hat 18 and the axial direction are arranged so that the outer yarn Y2 to be fed does not come into contact with the inner yarn supply package P1. A ring 19 having substantially the same diameter as the hat 18 is provided so as to form a pair. The ring 19 is not attached to the hat 18. With this configuration, the outer yarn Y2 separated from the balloon forming device 7 is secured to the inner yarn supply package P1 by a predetermined amount or more by contact with the hat 18 and the ring 19, so that the outer yarn Y2 is Then, it is guided to the fifth yarn guide 20 of the winding device 6 while being guided so as to avoid the inner yarn supply package P1.

  On the other hand, the inner yarn Y1 unwound from the inner yarn supply package P1 is guided to the shaft center by the sixth yarn guide 21, and then guided to the fifth yarn guide 20.

  Next, the configuration of the winding device 6 will be outlined. The winding device 6 traverses along the yarn path of the combined yarn Y, in order to traverse the tension Y with respect to the winding bobbin B, and the tension relaxation portion 22 for reducing the tension of the combined yarn Y by a predetermined amount. , A cradle 24 that rotatably supports the winding bobbin B, and a winding drum 25 for rotating the winding bobbin B supported by the cradle 24. In the present embodiment, the traverse device 23 is configured so that the unillustrated traverse guide that grips the combined yarn Y reciprocates so that the combined yarn Y traverses the take-up bobbin B, and reciprocates the traverse guide. A traverse motor 26 is provided. The winding drum 25 is provided with a winding drum motor 27 for rotating the winding drum 25 at a predetermined rotational speed.

  Next, the structure of the tension | tensile_strength imparting apparatus 5 is demonstrated based on FIG.3 and FIG.4. Please refer to FIG. 3 and FIG. FIG. 3 is a perspective view of the tension applying device. FIG. 4 is a developed view and a sectional view of the outer periphery of the driven pulley.

  As shown in FIG. 3, the tension applying device 5 according to the present embodiment includes a driven pulley 40 that is driven and rotated by winding the outer thread Y2 and feeding the outer thread Y2, and the driven pulley. And a schematically illustrated hysteresis brake 41 (rotation suppression means) for restricting the rotation of the motor 40. In the present embodiment, the driven pulley 40 rotates in a non-slidable manner with respect to the outer thread Y2. The hysteresis brake 41 is a kind of electromagnetic brake that suppresses the rotation of the driven pulley 40 by magnetic friction. That is, the tension applying device 5 is configured to apply a desired tension to the outer yarn Y2 wound around the outer periphery of the driven pulley 40 by increasing or decreasing the current input to the hysteresis brake 41. The casing 42 of the tension applying device 5 on which the driven pulley 40 is pivotally supported is formed with a seventh thread guide 43 for smoothly introducing the outer thread Y2 into the tension applying device 5, and an outer surface with respect to the driven pulley 40 is also provided. An auxiliary pulley 44 for securing a sufficient winding angle of the yarn Y2 is pivotally supported in the vicinity of the driven pulley 40. Furthermore, an eighth thread guide 45 for stabilizing the state in which the outer thread Y2 is wound around the outer periphery of the driven pulley 40 is formed in the lower part of the casing 42.

  As shown in the figure, the driven pulley 40 includes a pair of disk members 46 and 47 that face each other in the axial direction of the driven pulley 40, and a plurality of the disk members 46 and the disk members 47 that are laid between the pair of disk members 46 and disk members 47. The abutting member 48. Each contact member 48 is formed with a curved surface k. The abutting members 48 are arranged on the surface of the disk member 46 facing the disk member 47 at a predetermined interval along the circumferential direction so that the curved surface k faces the disk member 47. Similarly, the contact member 48 is arranged in parallel at a predetermined interval along the circumferential direction on the surface of the disk member 47 facing the disk member 46 so that the curved surface k faces the disk member 46. . As shown in FIG. 4, along the yarn path of the outer thread Y2 wound around the outer periphery of the driven pulley 40, a contact member 48 attached to the disk member 46 and a disk member 47 are provided. The abutting members 48 attached to the surface alternately appear at an equal pitch. That is, the driven pulley 40 is configured such that the outer yarn Y2 wound around the driven pulley 40 is alternately pressed along the circumferential direction of the driven pulley 40 in different directions. This pressing direction is indicated by a thick arrow in this figure. The tension applying device 5 is disposed exposed on the front side of the twisting unit 1 so that an operator of the twisting machine 100 can easily wind the outer yarn Y2 around the driven pulley 40.

  The mechanical configuration of the twisting machine 100 has been described above. Next, the electrical configuration of the twisting machine 100 will be described.

  As shown in FIG. 1, the machine base control device 2 controls the winding control unit 50 that controls the operation of the traverse motor 26 and the winding drum motor 27 of the winding device 6 and the operation of the tension applying device 5. Tension controller 51 (tension controller), spindle controller 52 for controlling the operation of the electric motor 14, operating condition storage 53 for storing various operating conditions, and load on the rotation of the driven pulley. And a load pattern storage unit 54 in which a torque load pattern is stored. The configuration of the machine control device 2 is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The load pattern storage unit 54 has load patterns as shown in, for example, FIG. 5 (b1), FIG. 6 (b2), and FIG. 6 (b3), specifically, time and current input to the hysteresis brake 41. Value relationships are stored.

  The winding control unit 50 is referred to by appropriately referring to the operating conditions input by the operator to the machine base control device 2 using an unillustrated input means such as a keyboard and stored in the operating condition storage unit 53, for example. The winding device 6 is configured to be controlled based on the operating conditions. Similarly, the spindle control unit 52 is configured to appropriately refer to the operation condition stored in the operation condition storage unit 53 and to control the electric motor 14 based on the referred operation condition.

  The tension controller 51 controls the operation of the tension applying device 5 so as to change the tension applied to the outer thread Y <b> 2 according to the rotation state of the spindle 13. Specifically, the tension control unit 51 appropriately refers to the operation condition stored in the operation condition storage unit 53, and based on the referred operation condition, any one of the load patterns stored in the load pattern storage unit 54 is selected. And the operation of the tension applying device 5 is controlled based on the read load pattern.

  The electrical configuration of the twisting machine 100 has been described above. Next, some explanation is added about the various load patterns illustrated by FIG.5 and FIG.6. 5 and 6 are graphs illustrating the load pattern of the torque applied to the rotation of the driven pulley. In each figure, the symbol sp identifies an exemplary line corresponding to the spindle rotation speed.

  The load pattern shown in FIG. 5A has been conventionally used, and its feature is that the load on the driven pulley is a fixed value. Conventionally, on the premise that the spindle 13 rotates at a constant speed at a predetermined speed and a balloon of the outer thread Y2 is formed, the delay angle θ [deg.] Shown in FIG. The load fixed value was merely set so as to be approximately 90 to 270. Therefore, conventionally, it generally takes time Δt until the balloon rises.

  On the other hand, FIG. 5 (b1), FIG. 6 (b2), and FIG. 6 (b3) are improvements of the conventional load pattern, and the feature is that a load a0 smaller than the load a1 during steady operation is obtained. This is a point provided until the rotational speed of the spindle 13 reaches a predetermined rotational speed. The aim is mainly to reduce the time required for the balloon to rise. In the load pattern shown in FIG. 5B1 (hereinafter referred to as load pattern b1), the rotation speed of the spindle 13 is set to a predetermined rotation speed (“predetermined” in this embodiment) from time t0 when the spindle 13 starts to rotate. The time period during which the load a0 that is less than half of the load a1 during the steady operation is applied (t0 to t1). Therefore, the load pattern b1 has a feature of increasing in a stepped manner. The load pattern shown in FIG. 6B2 (hereinafter referred to as load pattern b2) is from time t0 when the spindle 13 starts rotating to time ts when the rotational speed of the spindle 13 reaches a predetermined rotational speed. In addition, the load gradually increases linearly. FIG. 6B2 illustrates two patterns as the load pattern b2 in which the load increases linearly. That is, in the first pattern, the load is linear between time t0 when the spindle 13 starts rotating and time t1 that is slightly before time ts when the rotational speed of the spindle 13 reaches the predetermined rotational speed. Gradually increase. In the second pattern, the load gradually increases linearly from time t0 when the spindle 13 starts rotating to time t2 that is a little later than time ts when the rotational speed of the spindle 13 reaches the predetermined rotational speed. To do. The load pattern shown in FIG. 6 (b3) (hereinafter referred to as load pattern b3) is from time t0 when the spindle 13 starts rotating to time ts when the rotational speed of the spindle 13 reaches a predetermined rotational speed. Further, the load gradually increases so that the increasing rate of the load gradually increases or decreases. FIG. 6B3 illustrates two patterns as the load pattern b3. That is, in the third pattern, the load increases between time t0 when the spindle 13 starts rotating and time t3 that is a little later than time ts when the rotational speed of the spindle 13 reaches the predetermined rotational speed. The load gradually increases so that the rate decreases gradually. In the fourth pattern, the rate of increase in load is between time t0 at which the spindle 13 starts rotating and time t3 that is slightly after the time ts at which the rotational speed of the spindle 13 reaches the predetermined rotational speed. The load gradually increases so as to increase gradually. Examples of the load pattern b3 classified as the fourth pattern include those in which the load is proportional to the square of time. If the increase in the rotational speed of the spindle 13 is proportional to time, the centrifugal force acting on the outer thread Y2 is proportional to the square of the rotational speed of the spindle 13, so the load pattern in which the load is proportional to the square of time is It is considered that there is a certain advantage compared to the load pattern. The initial load a0 is provided for the stability of the yarn feeding of the outer yarn Y2.

  The configuration of the twisting machine 100 according to the present embodiment has been described above. Next, the operation of the twisting machine 100 will be described.

  In order to start the operation of the twisting machine 100, first, the inner yarn Y1 and the outer yarn Y2 are threaded so that the inner yarn Y1 and the outer yarn Y2 form a yarn path indicated by a solid line in FIG. At this time, the traverse motor 26, the winding drum motor 27, and the electric motor 14 are all stationary. As shown in FIG. 2 (a), the outer thread Y2 is linearly present in the radial direction from the yarn path 17 along the lower surface of the disk 15, and is accompanied by a considerable amount of tension as shown in FIG. The outer periphery of the disk 15 is in contact with the hat 18 and the ring 19.

  Next, the operator inputs various operating conditions to the machine base control device 2 via input means (not shown). Various input operating conditions are stored in the operating condition storage unit 53. Examples of the various operating conditions include a winding speed in the winding device 6, a traverse speed in the traverse device 23, the number of rotations of the spindle 13, a thread type, and a thread thickness. The yarn feeding speed of the inner yarn Y1 and the outer yarn Y2 is limited by the winding speed of the winding device 6.

  Various operation conditions stored in the operation condition storage unit 53 are appropriately read by the winding control unit 50, the tension control unit 51, and the spindle control unit 52, and the tension control unit 51 is based on the read operation conditions. The most appropriate load pattern is read from the plurality of load patterns stored in the load pattern storage unit 54. Then, the winding control unit 50 starts winding the combined yarn Y by controlling the winding device 6 based on the above operating conditions, and the spindle control unit 52 similarly controls the electric motor 14 based on the above operating conditions. By controlling, the rotation of the spindle 13 is accelerated at a predetermined angular acceleration as shown in FIGS. 5 and 6, for example, until the rotation reaches a desired number of rotations. At the same time, the tension control unit 51 applies a load to the rotation of the driven pulley 40 based on the read load pattern.

  By the way, the aspect in which the outer thread Y2 is wound around the driven pulley 40 in the tension applying device 5 so as not to slide is realized by the following operation. That is, the curved surfaces k of the plurality of abutting members 48 form a V-shaped groove on the outer periphery of the driven pulley 40 on the cut surface including the axis of the driven pulley 40 (see the lower diagram in FIG. 4), and from different directions, A mode in which the outer yarn Y2 is abutted or pressed against the outer yarn Y2 alternately along the circumferential direction, so that the outer yarn Y2 is nipped by the plurality of abutting members 48 and wound around the driven pulley 40 so as not to slide. Is realized.

  In other words, while the rotation speed of the spindle 13 is low, the outer yarn Y2 rotates on the outer periphery of the inner yarn supplying package support portion 3 while rubbing against the hat 18 and the ring 19.

  On the other hand, the number of rotations of the spindle 13 increases, and the tension of the outer yarn Y2 caused by the centrifugal force generated on the outer yarn Y2 is (1) the unwinding of the outer yarn Y2 from the outer yarn supply package P2. (2) tension applied to the outer thread Y2 by the gate type tensioner 9, (3) tension applied to the outer thread Y2 by the tension applying device 5, (4) ) When the total value such as (1) to (4) of the tension generated with respect to the outer thread Y2 in the third thread guide 11 and the fourth thread guide 12 is exceeded, the outer thread Y2 is indicated by a chain line in FIG. In this manner, the hat 18 and the ring 19 are separated from each other, and swelled toward the outer peripheral side between the outer peripheral edge of the disk 15 and the fifth thread guide 20 to form a balloon.

  The delay angle θ [deg.] At this time is approximately 90 to 270 as shown in FIG. The unwinding tension of the outer yarn Y2 from the outer yarn supplying package P2 is such that the outer yarn Y2 is unwound from the vicinity of the distal end of the outer yarn supplying package P2 and the base end of the outer yarn supplying package P2. When the outer thread Y2 is unwound from the vicinity, the fluctuation of the unwinding tension is offset by the increase / decrease of the delay angle θ [deg.]. A large fluctuation in the unwinding tension of the outer thread Y2 from P2 hardly affects the balloon of the outer thread Y2.

  Then, the outer yarn Y2 is swung around the outer periphery of the inner yarn supplying package P1, so that the outer yarn Y2 is twisted with the inner yarn Y1 to be the combined yarn Y immediately before reaching the fifth yarn guide 20. The tension is reduced by a predetermined amount in the tension relaxation portion 22 while maintaining the twisted combined yarn state, and the wound bobbin B is wound up while being traversed in the traverse device 23.

  The configuration and operation of the twisting machine 100 according to the present embodiment have been described above. Examples of the yarn type targeted by the twisting machine 100 include polyester, nylon, rayon, and aramid. Further, the shape of the inner yarn supplying package P1 and the outer yarn supplying package P2 may be, for example, cone winding, flange winding, bobbin winding, in addition to cheese winding as shown in FIG.

  As described above, in this embodiment, the spindle 13 rotated by the electric motor 14 (drive source) feeds the outer thread Y2 on which the balloon is formed on the outer peripheral side of the package P1 that supplies the inner thread Y1. The twisting machine 100 for twisting the inner yarn Y1 and the outer yarn Y2 is configured as follows. That is, the twisting machine 100 includes a tension applying device 5 (tension applying unit) that applies tension to the outer yarn Y2, and a tension control unit 51 (tension control unit) that controls the operation of the tension applying device 5. . As shown in FIGS. 5 and 6, the tension controller 51 operates the tension applying device 5 to change the tension applied to the outer thread Y <b> 2 according to the rotation state of the spindle 13. To control. As described above, according to the above-described configuration, which has been conceived by the inventor of the present application by paying attention to the relationship between the formation of the balloon and the tension, the formation of the balloon of the outer thread Y2 can be controlled.

  The above-described twisting machine 100 is further configured as follows. That is, the tension control unit 51 applies a tension smaller than the tension a1 applied to the outer thread Y2 during steady operation, and the rotation speed of the spindle 13 after the spindle 13 starts rotating is a predetermined rotation speed. The operation of the tension applying device 5 is controlled so that the tension is applied to the outer thread Y2 until the time reaches. According to the above configuration, the balloon of the outer yarn Y2 is formed at an early stage, so that the quality of the combined yarn Y generated immediately after the start of operation is improved and yarn breakage immediately after the start of operation is prevented. Further, even before the balloon of the outer yarn Y2 is formed, the tension of the outer yarn Y2 that rubs against other parts such as the inner yarn supply package P1 that supplies the inner yarn Y1, for example, is small. From this point, it can be mentioned that the quality of the combined yarn Y is improved and yarn breakage immediately after the start of operation is prevented. In the above-described embodiment, as the “predetermined number of rotations”, the number of rotations of the spindle 13 during the steady operation is used as one guide (see FIGS. 5 and 6). The “other parts” correspond mainly to the hat 18 and the ring 19 in the embodiment.

  The above-described twisting machine 100 is further configured as follows. That is, the tension applying device 5 includes a driven pulley 40 that is driven to rotate when the outer yarn Y2 is wound and the outer yarn Y2 is fed, and a rotation suppression unit that suppresses the rotation of the driven pulley 40. (In the above embodiment, the hysteresis brake 41). According to the above structure, the structure which provides tension | tensile_strength with respect to the said outer thread | yarn Y2 is considered, considering the quality of the said outer thread | yarn Y2.

  In the above-described embodiment, the hysteresis brake 41 is exemplified as the rotation suppression means. However, the present invention is not limited to this, and a brake by contact friction or the like may be employed.

  The above-described twisting machine 100 is further configured as follows. That is, the rotation suppression means is an electromagnetic brake (in the above embodiment, the hysteresis brake 41) that suppresses the rotation of the driven pulley 40 by magnetic friction. According to the above configuration, the degree of suppression of rotation of the driven pulley 40 can be easily controlled. Furthermore, since the configuration uses magnetic friction, a configuration in which the sliding portion is omitted is possible, thereby reducing the maintenance burden.

  The above-described twisting machine 100 is further configured as follows. That is, the driven pulley 40 is configured such that the outer thread Y2 wound around the driven pulley 40 is alternately pressed along the circumferential direction of the driven pulley 40 in different directions. . According to the above configuration, the driven pulley 40 that is driven and rotated by feeding the outer yarn Y2 is compared with a configuration in which the driven pulley 40 is achieved by simple contact resistance with the outer yarn Y2. The quality deterioration of the yarn Y2 can be reduced.

  In the above embodiment, the configuration in which the outer thread Y2 is pressed as described above by the curved surfaces k of the plurality of contact members 48 arranged in a special manner is realized. It is technically possible to substitute for.

  The above-described twisting machine 100 is further configured as follows. That is, the tension applying device 5 is disposed on the front side of the twisting machine 100. According to the above configuration, workability of winding the outer yarn Y2 around the driven pulley 40 constituting the tension applying device 5 is improved.

Schematic configuration of a twisting machine according to an embodiment of the present invention 2-2 sectional view of FIG. Perspective view of tensioning device Development and cross-sectional view of the outer periphery of the driven pulley A graph illustrating a load pattern of torque applied to the rotation of the driven pulley A graph illustrating a load pattern of torque applied to the rotation of the driven pulley

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Twisting yarn unit 2 Machine control device 5 Tension applying device 51 Tension control part Y1 Inner yarn Y2 Outer yarn P1 Inner yarn feeding package P2 Outer yarn feeding package 100 Twisting machine

Claims (6)

In the twisting machine, the inner thread and the outer thread are twisted together by sending the outer thread on which the balloon is formed by the spindle rotated by the drive source on the outer peripheral side of the package that supplies the inner thread.
Tension applying means for applying tension to the outer thread;
Tension control means for controlling the operation of the tension applying means;
With
The tension applying means is configured to be able to change the tension applied to the outer thread,
The tension control means controls the operation of the tension applying means so as to change the tension applied to the outer thread according to the rotation state of the spindle.
A twisting machine characterized by that In the twisting machine according to claim 1,
The tension control means applies a tension smaller than the tension applied to the outer thread during steady operation until the rotation speed of the spindle reaches a predetermined rotation speed after the spindle starts rotating. Controlling the operation of the tension applying means to apply to the outer thread;
A twisting machine characterized by that In the twisting machine according to claim 1 or 2,
The tension applying means includes a driven pulley that is driven and rotated by winding the outer thread and the outer thread is fed, and a rotation suppressing means that suppresses rotation of the driven pulley.
A twisting machine characterized by that In the twisting machine according to claim 3,
The rotation suppression means is an electromagnetic brake that suppresses rotation of the driven pulley by magnetic friction.
A twisting machine characterized by that In the twisting machine according to claim 3 or 4,
The driven pulley is configured such that the outer thread wound around the driven pulley is alternately pressed along the circumferential direction of the driven pulley in different directions.
A twisting machine characterized by that In the twisting machine according to any one of claims 3 to 5,
The tension applying means is disposed on the front side of the twisting machine,
A twisting machine characterized by that

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