Patent GB-284710-A (GB)
Title: Improvements in sewing machines
IPC: D04B17/00
Filed: 1928-02-02
Abstract: 284,710. Wieland, E. Feb. 4, 1927, [Convention date]. Darning; lock stitching.-A sewing-machine carries a mechanism able to be put into or out of action for repairing knitted goods. The working thread is brought by an eyed needle through the work, to a rotary loop-taker and a series of horizontal loop-holders, movable transversely step by step, forwards and backwards. The knitting or drawing mechanism is carried entirely on the sleeve 48 slidable on the shaft 15 of the sewing machine 2. For knitting or darning, Fig. 1, the slide 8 is pushed forward towards the needle 28 by turning the cam 11, the flap 130 thrown back and standards 128 carrying the work-holding frame 124, placed in the slide 74. The shuttle holder 30 is pushed back to inoperative position. The feed dog is thrown back out of the way of the needle. By rotating the main shaft 3, the thread feeder 5 and needle rod 4 are actuated in the usual manner. The connecting rod 21 turns the toothed wheel 17 to and fro rotating the shafts 15, 48 according to the gear ratio of the wheels 16, 17. Each horizontal loop holder 71 holds a loop 70, Figs. 12 and 13. As the cam 82 rotates, the rod 78 rotates the loop holder 71 coupled with it, behind the cover plate 72 just before the needle 28 arrives at the height of the cover plate. As the holder 71 recedes, the hook 68 carried by a tranverse bar 63 and rocked by a cam 51 acting on a friction roller arm 64, moves forward and takes the loop from the holder 71, Fig. 15. The needle 28 then descends through the loop so formed into the recess of the rotary loop taker 27, Fig. 17, the hook 68 moving back. The needle ascends to pull up the made loop, Fig. 19, and the loop taker 27 rotates to leave a further loop on the end of the holder 71 which has been thrust forward again, a spreader 59 keeping the loop open. The next stitch is then made in the same manner, the row of horizontal holders 71 having been moved one step to the right or left in readiness for the next descent of the needle 28. A cross-bar 100 has adjustable stops 101, 102 to regulate the traverse of the holders 71 for the size of holes to be darned. The cross bar is' carried by the carrier 74 of the holders 71 and when the carrier and its holders have moved transversely to the required amount, one of the stops comes into contact with the forked end of a lever 105, Fig. 5, rides it, and causes it to throw over the lever 107 and rock the shaft 108. This trips over the slide-guide 23, Fig. 10, which causes a pin 20 to bring the wheel 17 into position to bring one of the pawls 95, Fig. 9, into contact with its ratchet wheel 91 to feed the holders 71 step-by-step in one transverse direction by rotating the shaft 85, hence a pinion 84, through one tooth. The other stop has the effect of tripping the guide 23 in the opposite direction and bringing the pawl 96 into contact with its ratchet 92, to feed the holders in the opposite direction. For sewing, the whole of the mechanism on the sleeve 48 is retracted by the cam 11, the work holder 124 and standards 128 removed, the flap 130 closed, the feed dog thrown over into operative position and the shuttle holder 30 and shuttle 3 pushed up to the loop-taker 27. When knitting, the shaft 15 rotates alternately in both directions, but when sewing, the alternating mechanism is moved out of action by the slide 8 and the shaft rotates in one direction only.