Multiple twister

Abstract: To prevent an end missing or a straight winding of a twisted yarn during stoppage by driving a traverse device and a drum by common driving means and synchronizing the traverse device with driving of the drum. A drum driving system B of a drum 9 rotating a winding package P is coupled with a traverse device 11 traversing the twisted yarn around the winding package P via a non-step transmission 14 so as to be driven by means of a common driving motor 5.

Description: Field of the Invention The present invention relates a multiple twister for driving a drum for rotating a winding package and a traverse device for traversing a twisted yarn to be wound around the winding package by common driving means. Background of the Invention In a conventional two for one twister which is a typical example of a multiple twister, a yarn released from a yarn supply package is put into a spindle rotating at a high speed, and twisting is imparted while a tensile stress is imparted adequately by means of a tension device and ballooning is performed by means of a rotating disc mounted to the spindle. Then a twisted yarn is fed to a traverse device by means of a feed roller, and the yarn to be wound on a bobbin rotating in contact with a rotating drum is formed in a winding package. In a driving system of this two for one twister, as shown in Figure 5, an output of a first motor 81 driven by a command from a controller 80 is transmitted by means of a driving system comprising a plurality of pulleys, a belt, and a speed reducer to drive a spindle 82, a feed roller 83 and a drum 84. Further, a traverse device 85 is driven by the transmission of an output of a second motor 86 driven by another command from the controller 80 ,the transmission by of means of a driving system comprising a plurality of pulleys, a belt and cam box. When an induction motor rotating according to an output frequency from an inverter 87 is used for the second motor 86, acceleration and deceleration can be performed arbitrarily. Therefore, the rotation speed of the induction motor is periodically switched between the upper and lower limits, and ribbon break can be performed by a disturb function driven at a traverse speed at which the speed of the traverse device 85 are periodically varied. In a conventional multiple twister, however, there are provided the first motor 81 for driving the drum 84 and the second motor 86 for driving the traverse device 85, independently. Therefore, if the outputs of the motors 81 and 86 each are interrupted simultaneously during stoppage of the multiple twister, the traverse device 85 having a small inertial force stops more before the drum 84 having a greater inertial force stops. As a result, if the drum 84 is continuously driven with respect to the inactive traverse device 85, there is a danger of a end missing that a twisted yarn slips off from a winding package P, or a straight winding that a twisted yarn around the winding package P is wound around one section. It is an object of the present invention to prevent the end missing of the twisted yarn or the straight winding at the time of stoppage by driving a traverse device and a drum by common driving means and synchronizing the traverse device with driving of the drum. Summary of the Invention To solve the above problems, there is provided a multiple twister as claimed in claim 1 according to the present invention, comprising a spindle driving system of a spindle apparatus for twisting a yarn, a drum driving system for rotating a winding package for winding the twisted yarn and a traverse driving system of a traverse device for traversing the twisted yarn to be wound around the winding package. The spindle driving system, the drum driving system and the traverse driving system are driven by a common driving means, and the drum driving system and the traverse driving system are coupled with each other via non-step transmission for applying disturbance by making a traverse speed of the traverse device variable. Thereby, during stoppage of each system, the traverse speed of the traverse device can be made variable by non-step transmission so as to synchronize with drum rotation. In addition, by the non-step transmission, the traverse speed of the traverse device is made continuously variable between high and low speeds, thereby making it possible to wind a twisted yarn while disturbing it. Further, the spindle driving system, the drum driving system and the traverse driving system are driven by the common driving means so as to certainly maintain synchronization of each driving system during general acceleration and deceleration or during deceleration at the time of electric interruption. Thereby, package quality improvement can be achieved, and cut yarn due to excessive twisting can be certainly prevented. In claim 2, said non-step transmission as claimed in claim 1 accelerates the traverse speed of the traverse device step by step according to the winding quantity of the winding package and applies disturbance by making the traverse speed continuously variable between high and low speeds merely in a time zone in which a constant speed is achieved after acceleration. Thereby, when the traverse speed of the traverse device is accelerated step by step, a winding angle that changes according to the winding quantity of the winding package can be corrected. Alternatively, when the traverse speed is made continuously variable between high and low speeds in a constant-speed time zone, the twisted yarn can be wound around the winding package while it is disturbed. In claim 3, the non-step transmission as claimed in claim 1 or claim 2 is provided with a pair of pulleys coupled with each of the driving means side and the traverse driving system and an endless belt to be wound around each pulley, each pulley having a taper face following taper faces formed on both sides of the endless belt and comprising two taper bodies arbitrarily drawn together and separated from each other, one of these pulleys being provided with drawing and separating means for forcibly drawing together and separating one taper body to/from another. Thereby, when each taper body interval of one pulley is forcibly adjusted by the drawing and separating means, the endless belt is changed to a diameter according that interval. Further, each taper body interval of the other pulley is changed in according therewith, and the diameter of the endless belt is changed. Therefore, the traverse speed of the traverse device can be made variable appropriately due to such change in the diameter of the endless belt. In claim 4, said non-step transmission as claimed in any one of claims 1 to 3 is provided with a reversible motor, a sensor for detecting a traverse speed, and a controller, the controller applying disturbance by switching forward and backward rotation of the reversible motor according to the detected traverse speed. Thereby, an actual traverse speed is detected, and variable control of disturbance can be performed, thus making it possible to perform simple and precise disturbance merely by forward and backward rotation of the reversible motor. Brief Description of the Drawing Figure 1 is a schematic view showing a multiple twister. Figure 2 is an enlarged view showing a structure of a non-step transmission employed for the multiple twister. Figure 3 is a graph showing traversing operation of a traverse device of the multiple twister. Figure 4 is a graph showing a relationship between a winding angle and a time of the traverse device of the multiple twister. Figure 5 is a schematic view showing a conventional multiple twister. Detailed Description of the Preferred Embodiments Hereinafter, a multiple twister in embodiments of the present invention will be described with reference to Figures 1 to 4. In Figure 1, a multiple twister 1 is provided with one spindle unit formed of a spindle apparatus 2 and a winding apparatus 3 positioned on the spindle apparatus 2, and is disposed in horizontal array on the back to form 80 to 304 spindle units as a whole. This multiple twister 1 is provided with the devices 2 and 3, a driving motor 5 (driving means), a spindle driving system A driven by the driving motor 5, a drum driving system B and a traverse driving system C both of which are driven by the driving motor 5 and a controller 6. The spindle apparatus 2 comprises a cover 7 where a yarn supply package is loaded and a spindle 8 coupled with the spindle driving system A. A winding apparatus 4 comprises a drum 9 with which a winding package P is pressed and a feed roller 10 and which are driven by the drum driving system B and a traverse device 11 traversed by a traverse driving system C. The driving motor 5 is an induction motor and is driven by a rotation speed determined by an output frequency from an inverter (not shown in the drawin) connected to the controller 6 to drive the spindle driving system A and to drive the drum driving systems B and the traverse driving system C via a speed change belt device 12, a speed reducer 13 and a non-step transmission 14. The spindle driving system A has a belt 19 wound around a first pulley 15 provided at an output shaft of the driving motor 5 and a second pulley 16 of a shaft 21 provided in parallel to the driving motor 5, and a tangential belt 20 is wound between a third pulley 17 of the shaft 21 and a fourth pulley 18. The tangential belt 20 is transferred in contact with the spindle 8 of each spindle apparatus 2, and driving of the driving motor 5 is transmitted to each spindle 8 by means of each of the pulleys 15 to 18 and a belt 19 and then is rotated. The drum driving system B has a belt 28 wound around a fifth pulley 22 provided at an output shaft between the driving motor 5 and the first pulley 15 and a sixth pulley 23 of a shaft 27 provided in parallel to the shaft 21. The shaft 21 is coupled with the speed reducer 13 via a belt 29 wound around seventh and eighth pulleys 24 and 25 of the speed change belt device 12 (no-step transmission). The speed reducer 13 has a plurality of gears disposed therein and these gears are decelerated by inputting rotational force from an input shaft 30 provided with the eighth pulley 25 of the speed change belt device 12. At the same time, a rotational direction is changed. In addition, the speed reducer 13 has three output shafts 31a to 31c and is a three-shaft output by a single-shaft input. A ninth pulley 26 is engagingly mounted to each of the parallel two output shafts 31a and 31b, and the traverse driving system C is coupled with the remaining output shaft 31c. A belt 36 is wound around each of the ninth pulley 26, a tenth pulley 33 engagingly mounted to a support shaft 32, and an eleventh pulley 35 engagingly mounted to a support shaft 34. The drum 9 is engagingly mounted to the support shaft 32 with a given interval, and the feed roller 10 is engagingly mounted to the support shaft 34 with a given interval. The outputs of the driving motor 5 are transmitted to the support shafts 32 and 34 of the drum 9 and the feed roller 10, respectively, via the belt 28, the speed change belt device 12, the speed reducer 13 and the belt 36. The traverse driving system C has the non-step transmission 14 coupled with the speed reducer 13 and the non-step transmission 14 is continuous to a cam box 40. The cam box 40 has a gear 42 at a transmission shaft 41 coupled with the non-step transmission 14 and is provided with a grooved drum 44 coupled with a gear 43 to be geared with the gear 42. The grooved drum 44 is formed of a spiral-pattern cam groove 45 and a cam shoe 46 is engaged with the cam groove 45. A reciprocating rod 47 is secured to the cam shoe 46, and the transverse device 11 is secured to the reciprocating rod 47 with a given interval. An output of the driving motor 5 is transmitted from the non-step transmission 14 to the grooved drum 44 of the cam box 40 via the speed change belt device 12 and the speed reducer 13, the cam shoe 46 is moved along the cam groove 45 by rotation of the grooved drum 44, and thereby the traverse device 11 is reciprocated and traversed. The controller 6 is connected to the driving motor 5, an input board 60, a reversible motor 53 (drawing and separating means) of the non-step transmission 14, a control motor 61 of the speed change belt device 12, a drum proximity sensor 62 and a traverse proximity sensor 63, respectively. The input board 60 inputs to the controller 6 data such as conditions of the traverse device 11 (winding angle , traverse speed v and disturbance swing width h), number of twists N, rotation speed of the spindle and rotation speed of the drum 9. The proximity sensor 62 detects rotation of a target body 64 of the shaft 32 to monitor an actual rotation speed of the drum 9 and outputs it to the controller 6. Alternatively, the proximity sensor 63 detects rotation of a target body 65 of the grooved drum 44 to monitor the winding angle and the traverse speed v of the traverse device 11 and outputs it to the controller 6. The controller 6 controls driving of the driving motor 5, the reversible motor 53 and the control motor 61 by means of data inputted from the input board 60 and detection fed back from each of the proximity sensors 62 and 63. Now, in Figure 2, with reference to a concrete structure of the non-step transmission 14, the non-step transmission 14 comprises an input side pulley 50 provided at an output shaft 31c of the speed reducer 13, an output side pulley 51 provided at a transmission shaft 41 of the cam box 40, an endless belt 52 wound between the pulleys 50 and 51, and the reversible motor (forward and backward rotation motor). The pulleys 50 and 51 comprises outer and inner washers (taper bodies) 54 and 55, and the insides of the washers 54 and 55 are formed on taper faces, respectively. A holder is securely mounted to the inner washer 55 of the input side pulley 50. An output shaft 56 of the reversible motor 53 is coupled with the holder via a clutch 57 and the inner washer 55 of the input side pulley 50 is axially moved to the outer washer 54 fixed to the output shaft 31c by forward and backward rotation of the motor 53. The outer washer 55 of the output side pulley 51 is provided with a spring box 58. A biasing spring 59 biasing the outer washer 55 toward the inner washer 55 fixed to the transmission shaft 41 is disposed inside of the spring box 58. The endless belt 52 having taper faces on both ends following the taper faces of the washers 54 and 55 are wound around each of the pulleys 50 and 51. When the reversible motor 53 is forward rotated, the inner washer 55 of the input side pulley 50 is moved toward the outer washer 54 so as to narrow an interval and a distance. Therefore, a winding diameter of the endless belt 52 of the input side pulley 50 increases. Accordingly, the outer washer 54 of the output side pulley 51 is moved against spring force of the biasing spring 59 to widen an interval and a distance with respect to the inner washer 55. Therefore, the winding diameter of the endless belt 52 of the output side pulley 51 decreases. When the reversible motor 53 is rotated backward, the inner washer 55 of the input side pulley 50 decreases to widen an interval and a distance from the outer washer 54. The winding diameter of the endless belt 52 of the input side pulley 51 decreases. Accordingly, the outer washer 54 of the output side pulley 51 is moved by spring force of the biasing spring 59 so as to narrow an interval and a distance with respect to the inner washer 55. Therefore, the winding diameter of the endless belt 52 of the output side pulley 51 increases. Thus, the non-step transmission 14 changes a rotation speed output from the output side pulley 51 to the cam box 40 and varies the traverse speed of the traverse device 11 via the cam box 40 by changing the winding diameter of the endless belt 52 with respect to each of the pulleys 50 and 51 through forward and backward rotation of the reversible motor 53. The multiple twister 1 of the present invention is constructed as described above. Now, an operation of multiple twister 1 will be described. The controller 6 receives data such as spindle rotation speed, drum rotation speed, winding angle  and traverse speed v with respect to the traverse device 11, and disturbance width h of the twisted yarn and so on from the input board 60, and drives the driving motor 5 based on these data. When the driving motor 5 is driven, its output is transmitted to the spindle apparatus 11 via the spindle driving system A. The yarn to be released from a yarn supply package enters a tension device (not shown in the drawings), a given tensile stress is imparted. Then, the yarn is ballooned on a rotating disc of the spindle 8 rotating at a high speed and reaches a balloon guide. One twist is applied from the tension device to the rotating disc, and another twist is applied from the rotating disc to the balloon guide and reaches the feed roller 10. An output of the driving motor 5 is transmitted via the drum driving system B and the traverse driving system C, the feed roller 10 and the drum 9 is rotated, and the traverse device 11 is traversed. Thereby, the twisted yarn from the spindle apparatus 2 reaching the feed roller 10 is wound around the winding package P pressed by the drum 9 traversed by the traverse device 11. With respect to winding of the twisted yarn, the traverse device 11 winds such yarn depending on the traverse speed v and the disturbance width h shown in Figure 3 and depending on a winding angle  shown in Figure 4. That is, the traverse conditions of the traverse device 11 is determined by controlling the non-step transmission 14 based on information such as the winding angle  due to the proximity sensor 63 continuously fed back to the controller 6 and the traverse speed v. One period of the winding angle in Figure 4 corresponds to that of disturbance in Figure 3, and disturbance is performed for the winding angle to swing at a width of 7%. In this state, the pulleys 50 and 51 of the reversible motor 53 of the no-step transmission 14 are fixed. As shown in Figure 3, the traverse speed v of the traverse device 11 is accelerated from the beginning of driving of the driving motor 5 to a time t1 while a constant speed relationship with respect to the drum 9 is maintained. The reversible motor 53 of the non-step transmission 14 is rotated forward and backward at time t2 at which a constant speed is achieved. A diameter of each of the pulleys 50 and 51 is increased and decreased with respect to the endless belt 52, the traverse speed v of the traverse device 11 is made constantly variable within a certain range between low and high speeds, and thereby the twisted yarn Y is wound around the winding package P while it is disturbed at a width h, as shown in Figure 3. Thus, the traverse speed v of the traverse device 11 is accelerated step by step, and the yarn is disturbed merely in time zones t2, t3, t4... at which a contact speed is achieved after acceleration. A yarn is disturbed merely in time zones t2, t3, t4... at which a constant speed other than acceleration is achieved because it is difficult to make it variable between high and low speeds for disturbance while the traverse speed v is accelerated step by step by means of the non-step transmission 14. Thereby, the winding angle  changing according to a winding quantity of the twisted yarn Y to be wound around the winding package P can be corrected to the setting, and a ribbon can be prevented from being produced at the winding package P due to disturbance. When the multiple twister 1 is stopped, the traverse speed v of the traverse device 11 is synchronized with rotation of the drum 9. That is, the controller 6 is employed by controlling the non-step transmission 14 using the procedure similar to that shown in Figure 3 based on an a actual rotation speed of the drum 9 fed back from the proximity sensor 62. Further, the reversible motor 53 of the non-step transmission 14 is rotated forward and backward, the diameter of the endless belt 52 is increased or decreased with respect to each of the pulleys 50 and 51, and thereby the traverse speed v of the traverse device 11 is decelerated and is synchronized with rotation of the drum 9 while a constant speed relationship is maintained. Thereby, the traverse device 11 and the drum 9 can be stopped simultaneously, and the end missing or the straight winding during stoppage can be prevented. According to the multiple twister of the present invention, the drum driving system of the drum rotating a winding package is coupled with the traverse driving system of the traverse device traversing the twisted yard to be wound around the winding package via the non-step transmission and is driven by common driving means. During stoppage of each system, the traverse speed of the traverse device is made variable so as to synchronize with rotation of the drum, therefore, the traverse device and the drum can be stopped simultaneously, thereby making it possible to prevent the end missing or the straight winding during stoppage. With the non-step transmission, the traverse speed of the traverse device is accelerated step by step according to a winding quantity of the winding package, and the traverse speed is made continuously variable between high and low speeds merely in a time zone at which a constant speed is achieved after acceleration. Thus, the winding angle varied by a winding quantity of a twisted yarn due to the winding package can be corrected, and the twisted yarn can be wound while it is disturbed. Therefore, a ribbon of the winding package around which a twisted yarn is wound is prevented from being generated, thereby making it possible to provide a good-quality winding package. Further, said non-step transmission comprises the endless belt, a plurality of pulleys comprising two taper bodies that drawn together and separated from each other arbitrarily, and drawing and separating means for forcibly drawing together and separating each of the taper bodies of one pulley. When each taper body interval of one pulley is forcibly adjusted by the drawing and separating means, the endless belt is changed to a diameter according to that interval, and each taper body interval of the other pulley changes in conformity therewith, and the diameter of the endless belt is changed. Therefore, the traverse speed is made variable appropriately by change in the diameter of this endless belt. Since the taper face of the pulley can be brought into contact with the taper faces on both sides of the endless belt, slippage is reduced even if tensile stress of the endless belt is weak, the service life of the endless belt is extended, and power transmission precision is enhanced.

Claims: A multiple twister (1) comprising: a spindle driving system (A) of a spindle apparatus (2) for twisting a yarn; a drum driving system (B) for rotating a winding package (P) for winding a twisted yarn; and a traverse driving system (C) of a traverse device for traversing the twisted yarn to be wound around the winding package (P), the spindle driving system (A), the drum driving system (B) and the traverse driving system (C) being driven by a common driving means, the drum driving system (B) and the traverse driving system (C) being coupled with each other via non-step transmission for applying disturbance by making a traverse speed of the traverse device (11) variable. A multiple twister as in claim 1, wherein the non-step transmission accelerates a traverse speed of a traverse device step by step according to a winding quantity of a winding package, and a traverse speed is made continuously variable between high and low speeds merely in a time zone in which a constant speed is achieved after acceleration for applying the disturbance. A multiple twister as in claim 1 or claim 2, wherein the non-stage transmission is provided with a pair of pulleys coupled with each of the driving means side and the traverse driving system and an endless belt to be wound around each pulley, each pulley comprises two taper bodies having respectively a taper face following one of the taper faces formed on both sides of the endless belt and are drawn together and separated from each other, and one of these pulleys is provided with drawing and separating means for forcibly drawing together and separating each taper body. A multiple twister as in any one of claims 1 to 3, wherein the non-step transmission is provided with a reversible motor, a sensor for detecting a traverse speed, and a controller, the controller applying disturbance by switching forward and backward rotation of the reversible motor according to a detected traverse speed.

Inventors: KURODA KEIJI, TOYOSHIMA TAKAO, YAMAMOTO YUHEI, KURODA, KEIJI, TOYOSHIMA, TAKAO, YAMAMOTO, YUHEI
Applicants: MURATA MACHINERY LTD, MURATA KIKAI KABUSHIKI KAISHA
Application year: 1998
Main classification: D01H1
IPC codes: D01H1, B65H54, D01H7