Patent GB-681525-A (GB)
Title: Improvements in or relating to methods and apparatus for winding and twisting yarns
IPC: D01H1/00
Filed: 1951-01-08
Abstract: 681,525. Twisting and winding yarn. UNIVERSAL WINDING CO. Jan. 8,1951 [Jan. 11, 1950], No. 560/51. Class 120(ii) A method of twisting a strand of yarn and winding the twisted strand into a package comprises the steps of continuously rotating a loop in a running strand of the yarn to inpart two turns of twist thereinto for each revolution of the loop, winding the initial run of the strand inside the loop and into a coil until the loop is inserting a predetermined number of turns per unit length thereinto, and winding a subsequent run of the strand to which said predetermined turns s per unit length is being inserted inside the rotating loop and into a package separate from the coil. Synthetic fibres produced by the apparatus 322, driven by the motor 324, are twisted and wound up in double-twist devices 24 driven by synchronous motors 12 supplied with A.C. from a generator 334 also driven by the motor 324, through a variable speed transmission 328, so that the rate of production of the yarn and the twisting and winding of the same may be synchronized. Alternatively, the double - twist devices may be driven from the motor 324, through the transmission 328, and shafting and belts driven thereby. The fibres enter each double - twist device 24 through a radial bore 23 in a flyer 18, the winding and other mechanisms on a platform 26 within being held stationary by magnets 42. If the "stationary" platform 26 should begin to rotate, a bar magnet 48 is moved away from the armature 54 on an arm 52 to operate a switch 50 and break the motor circuit. Compressed air admitted through the conduit 220 to the hollow spindle 10 and to a tube 216 rotates a turbine wheel 178 which rotates a cylindrical shell 180 and waste take-up roll 176 provided with yarn-entangling pins 179. These pins take up the leading end of the yarn which has not attained the desired twist, the yarn having been forced along the tube 216, which is slit throughout its length at 218, by the current of air. As soon as yarn is being collected on the waste roll 176, the motors 12 of the double twist devices are started so that the spindle 10 of each flyer 18 is rotated and the winding-on and yarn furnishing mechanisms are operated. The spindle 10 drives the shaft 66 which, through worm gearing 84 drives the shaft 82. This shaft, through worm gearing 90, drives the shaft 92 and hence pulleys 100, 102, the pulley 100, through belt 160, driving the package-driving roll 148 and the pulley 102, through belts 198, 200, driving the rotary yarn guide 192 furnishing with threads 206, 208, Fig. 6, to provide, respectively, for the winding of the waste yarn on the take-up roll 176 and a transfer tail on the core of the package. The threadguide 186, which is of the selfthreading kind, is reciprocated by a barrel cam 140 drivien by a belt 146 from a pulley 118 driven by the shaft 82 through a differential gear 104. Also on the belt 82 is a worm 130 which drives a crank block 132 which through a rod 131 oscillates the housing 108 of the differential 104 to increase and decrease the speed of the shaft 116 of the pulley 118 so to change the traverse speed of the barrel cam 140 to prevent ribbon winding. The yarn furnishing mechanism comprises rolls 260, 262 positively rotated by the shaft 242 from the shaft 82 by belt 248 and the means for turning the assembly of feed rolls 260, 262 to effect feed of the yarn comprises a ratchet wheel 230 rotated by a shaft 270 driven from the shaft 150 of the package-driving roll 148 by a belt 274. After the initial end of yarn has been woundup on the waste roll 176, the pull on the yarn draws it through the slot 218 of the tube 216. The yarn then moves towards the centre of the package core being picked up by the screw-thread 206 to wind some turns on the shell 180. It then moves further and on to the core 169, the flyer 18 now having attained the predetermined desired speed, and screw 208 effects the winding of the transfer tail on the core 169. The yarn is then picked up by the self-threading guide 186 and moved towards the left, Fig. 5, moving across the bail 263, and thus drops between the rotating rolls 260, 262. Contact of the yarn with a tripping wire 304 releases a detent 302 to allow a spring-biassed lever 294 to move and press a detent 306 into engagement with the rotating ratchet wheel 230, the engagement being maintained by a cam surface 280. The roll assembly is then rotated through about 270 degrees to wrap the thread through that angle about each of the rollers 260, 262, the assembly being latched in the yarn-feeding position by a latch 314, and the detent . 302 released from the wheel 230 (by a cam 318 if necessary) to prevent further rotation of the assembly. When it is desired to reset the assembly, the pivot rod 316 is depressed to free the latch 314 and slow the coil spring 292 to rotate the assembly back to its non- feeding position. The package of yarn, carried by a swinging arm 164, is supported partly by the attractive power of two magnets 174, one of which is moved with the pivot pin 166 of the arm 164 so to move closer to the other magnet as the package grows and receive progressively more attractive force.