Patent GB-697646-A (GB)
Title: Improvements in pirn winding and like machines
IPC: B65H54/14
Filed: 1950-02-08
Abstract: 697,646. Winding yarn. CROWTHER, Ltd., KIMBER, R. A., and COLEMAN, P. E. R. Feb. 8, 1951 [Feb. 8, 1950], No 25868/49. Class 120(ii) A pirn winding machine having automatic traverse changing mechanism comprises a rotatable traverse cam carrying an endless track, a follower engaging it, an oscillating lever carrying the follower and movable about an axis transverse to that of the cam, a holder for the lever and bodily adjustable with the same about the axis of the cam, a nember engaging the lever at a variable distance from its axis, determined by the holder, and movable to and fro by the lever with variable amplitude d e t e rmined by that adjustment, the lever being movable about an axis laterally offset from the axis of the cam and carrying the follower at its free end. The headstock 7 which may be constructed as in Specification 692,090, is driven from the shaft 13a by change gears 98, 99, the shaft 13a being driven by a friction coupling from the input element 8. The tailstock 6, the centre 'part of which is movable to permit insertion and removal of pirns, moves in guideway 5 in the casing 1. A cam shaft 11, fixedly carrying a cam 12, is rotated by worm and worm wheel 13, 14 and freely carries a holder 15 in which the cam follower 16 is supported, the follower being of arcuate form with an inturned end 17 positioned in the track of the cam 12. Pivotally mounted in the casing 1 is a rock shaft 18 carrying a spring-urged lever 19 which has a pin 20 (not shown) bearing on the cam follower 16, oscillation of which rocks the shaft to an extent dependent upon the angular position of the holder 15 about the shaft 11. The amount by which the holder 15 can turn about the shaft is determined by a beak-like part 21 thereon contacting an adjustable stop-rod 22 moved axially by an external kncb 23. Also mounted in the casing 1 is a spring- urged lead screw 25, carrying a gear 25<SP>1</SP> at one end, and slidable on the screw is a yarn guide carriage 26 having hook-shaped lugs 27 which ride on the rock-shaft 18. Between the lugs 27 is a sleeve 28 (not shown) slidably keyed to the shaft 18 and provided with a pin 29 which contacts a pin 30 (not shown) on the yarn guide proper 32. Movements of the rock-shaft 18 hence oscillate the yarn guide 32, each return movement being effected by a spring 33. Mounted upon the carriage 26 is a spring-urged lever 34 having a blade 34a adapted to engage the lead screw 25 to advance the carriage 26, the return of which is effected by a spring 18a. The lead screw 25 is constantly reciprocated endwise by a bell-crank 35, having an adjustable tappet 37 and oscillated about a pin 36 by an eccentric 39 driven from the cam shaft 11. The lead screw 25 is driven by a packagecontacting roller 40 mounted on the carriage 26, the roller being slidably keyed to a shaft 41 geared to the lead screw 25 through gears 41a, 25<SP>1</SP>. The shaft 41 and a shaft 45 are carried by arms 42 movable about the lead screw 25 so that the distance between the roller 40 and the axis of the pirn may be pre-set. On the shaft 45 is a ramp 46 engaged by an adjustable finger 47 (not shown) on the carriage so that shaping of the package may be effected. Mounted on a shaft 48 is an arm 49 carrying an adjustable stop 50 which lies in the path of a roller 51 on the carriage 26 so to lower the arm 49 to rotate the shaft 48 when the pirn has reached the desired length to allow a spring-urged rod 52 to swing a lever 13c to disengage the friction drive and stop the machine. The same may be effected manually by means of a press button 88 or by a cam 55 on the shaft 56 of the threadguide arm 57, the cam moving, when the thread breaks, to displace a lever 54 and operate the stop rod 52. Also, when the carriage reaches the tail-stock end of its travel, the blade 34a is removed from the lead screw 25 by the movement of a pin 63 on the carriage thus releasing it to move under spring-pressure 18a towards the headstock end and to impinge against a baffle 70. The holder 15 carries a stop plate 72 (not shown), which is adjustable (by clamping bolts) about the cam shaft 11, the plate 72 co-operating with a spring-biased check disc 74 which is racked by pawl and 'ratchet mechanism driven from the worm wheel shaft 14a. After a preadjusted number of revolutions of the winding spindle, the disc 74 frees the plate 72 and hence the holder 15 so that, after a desired length of bunch has been wound; the normal traverse of the yarn guide is brought about. The headstock clutch 7b may be moved to stop the pirn for piecing up by moving a lever 61, while allowing the spindle to continue running. Specification 697,647 also is referred to.