Patent GB-638558-A (GB)
Title: Improvements in or relating to pirn-winding machines
IPC: B65H54/14
Filed: 1947-05-20
Abstract: 638,558. Winding yarn. HARRISON KNITTING & TEXTILE MACHINERY CO., Ltd., and KIMPTON, W. H. May 20, 1947, No. 13505. [Classes 120 (ii) and 120 (iii)] In a pirn-winding machine of the kind in which a thread traverse guide movable to and fro on a carriage movable lengthwise of the pirn by a builder disc rotatably mounted on a screwed rod and adapted to contact the wound thread to screw itself progressively along the rod, the to and fro motion of the traverse guide is effected by a rotatable cam extending lengthwise of the pirn over substantially the whole length of the pirn and substantially parallel thereto and, during the pirn building, engaging a follower connected to the guide. The spindles 24 are driven by an endless belt 22 from an electric motor, the belt pressing against a pulley 23 on each spindle. The pulleys 23 each comprise separable discs which may be urged apart, against spring pressure, by a cam member 45 to stop the rotation of the spindles. The main motor also drives a sprocket 27 and, thereby, a chain 28 which rotates the traverse cam shafts 30 to drive cams 59, extending the maximum length of the pirns to be wound, one cam 59 being fitted for each spindle. A change-speed gear box is fitted to vary the traverse cam speed. Also driven from the main motor, through belts and reduction gearing, is a shaft 36 which, through a worm and wormwheel, drives a cam shaft 187 carrying cams for effecting the automatic operation of doffing, donning and other mechanisms. The traverse cam shaft 30 is carried by levers from a shaft 47 so that it may be made to approach or recede relative to the spindle 24. The pirn tube 13 to be filled, is gripped between the forward end 60 of the spindle 24, through a rubber pad 264, and a freely-running centre 64 carried in a bracket 66 adjustable on a rod 67 to allow of different tube lengths to be dealt with. The pirn builder-motion comprises a screwed rod 70 and a builder disc 92, the rod 70 being spring- urged and adjustably carried at one end in a slot in the end plate 58, and at the other end being pivotally attached to an adjustable slider 72, so to allow of pirns of different diameters to be wound and to permit of shaping of the pirns by an adjustable cam-plate 3 on a carriage 88 which also traverses the thread traverse guide 102. The carriage 88, which slides along a rod 85, pivotally carries the thread guide 102 which is oscillated by the cam 59, through a cylindrical follower. The amount of oscillation is adjustable by varying the position of the pirn, carrying the follower, in the arm 110 of the traverse lever. The carriage is advanced by the contact of the disc 92 with the pirn being wound, the disc engaging the screwed rod 70 through a bent leaf spring 95. Positioned parallel with the line of centre is a pirn-tube supply magazine 9, from which empty tubes 63 are released one by one by a device 124, 130, the levers 124 being rocked by a shaft 122 and through a position 134 releasing the end 133 of the spring trip 130 to allow the lowermost tube on the shelf 126 of the levers 124 to fall into a tray 135, the other tubes being trapped by projecting toes 131. The fed tube 63 is later transferred to the winding position by an arm 138. When a tube has been filled, a boss 154 on the carriage 88 strikes an adjustable clip 155 on a rod 156 to move the same and turn a lever 158 which releases a lever 162, (1) to push a link 169 upwardly to stop the spindle drive and (2) to operate through a link 183 a clutch in a cam box to effect automatic tube change &c. Operation (1) is effective to rock a plate 176 into line with a cam 180 carried by the traverse cam shaft 30, the cam 180, through the plate 176, rocking the lever 50 to withdraw a latch 49 from a catch 54 to allow the lever 46 under spring influence 48 to rise and separate the discs of the pulley 23 to stop the spindle rotation. If, during winding, the thread breaks or comes to an end, the thread guide 143, 146 moves to rock a lever 149 which lifts a link 153 to bring the plate 176 into line with the cam 180 to stop the spindle in like fashion to that described previously. Operation (2) above, is brought about through a link 183 attached to the lever 162 and to a trip lever 184. The raising of the lever 184 permits a spring 194 to throw in a clutch to set the cam shaft 187 in rotation, and, after a revolution, to effect declutching. The cam shaft, which is driven through a shearpin 106a, carries cams A-F which effect the following operations. (i) Cam D, through a lever 205, pushes the rod 67 to withdraw the centre 64 from the end of the tube thus allowing a filled tube to drop into a tray, carrying the thread with it. (ii) Cam A, through levers 213, 219 and link 217, spring-urged at 220A, sweeps the carriage 88 and builder disc 92 to the position of the base of the pirn. During this sweep, a pirn 221 resets the lever 162, the trip-lever 184 and restores the plate 176 to its original position. (iii) Cam F, through levers 224, 227, 229 moves a pair of spring-urged notched blades 230, 232 so that the yarn extending to the doffed pirn enters the notches and is carried thereby to lie across the driven centre 60 so that it may be clamped there by a fresh pirn tube later fed thereto. The yarn is clamped by the blades 230, 232 as the lever 229 brings them against an abutment 236. (iv) Cam B, through a lever 240 operates the shaft 122 of the magazine feeding device to drop the tube from the shelf 126 into the transfer tray 135 and to release another tube from the magazine on to the shelf 126. (v) Cam E, through levers &c. 246, 249, 250 rocks the shaft 139 to carry the pirn tube in the tray 135, which has a yielding side to the line of centres, cam D permitting the centre 64 to close on to the small end of the tube and press it against the driving centre 60 to trap the thread. (vi) Cam C, through the lever 253 and link 255 now pulls the wedge 45 of the lever 46 from between the discs of the pulley 23 to set the winding spindle 24 again in motion and the catch 54 is reset. The rotation of the fresh pirn tube causes the yarn trapped by the blades 230, 232 to enter one of a number of notches in a disc 258 mounted on a plunger 259 in the centre 60, which carries the yarn behind the disc 258 and traps it against a rubber ring 263 and breaks the thread. In a modification, a lower pair of blades carried by the lever 229 may sever the thread, and an upper pair trap it to ensure its presentation to the centre 60. The traverse cam 59 may be withdrawn from its follower and the lever 102 may then be arranged to form a " bunch" at any desired point near the large end of the pirn tube. Adjustably attached beneath the carriage 88 is a cam plate which in co-operation with an adjustable projection 274 on the rod 70 determines the angle of chase. A pointer 277 and scale 278 aid adjustment. Specifications 638,619 and 638,620 are referred to.