Patent GB-191120819-A (GB)
Title: Improvements in and relating to Sewing Machines for Making Boot Soles.
IPC: D05B67/00
Filed: 1911-09-20
Granted: 1912-09-19
Abstract: 20,819. Weyl, R. & L. Sept. 20, 1910, [Convention date]. Sewing - machines; boot - soles, making by stitching together ribbons, plaits, and the like. -The coiled material is held between two half die-plates by a pair of cover-plates p, q, Fig. 7, which are clamped together by a toggle fastening r, s, and the die-plates, after being forced together to compress the sole material by a hand press adjacent to the clamp slide w, Fig. 2, are held from separation by the walls of the slide. The clamp is then traversed through the machine by a feed-chain with which a projection x on the underside of the clamp engages. The chain is driven by a ratchet gear, the stroke of which is reduced, when the toe and heel are being stitched, by means of projections 11 on the clamp which move a stop into the return path of the ratchet pawl. As the clamp is moved into operative position by hand operation of the feed-chains, a projection 49 on the clamp forces upwards one end of a lever 50, and an oblique surface on the other end of the lever moves a pivoted rod 51 and closes the driving- clutch 52. As the clamp leaves the stitching point, another projection 53 engages with a lever 54 and thereby moves a spring piece on a rod 55 into the path of the part 56 of a crosshead g attached to the needle-bar, so that on the next return stroke of the cross-head the rod 55 is moved, and the clutchrod 51 to which it is pivoted is operated to open the clutch. At the same time, a link 76 communicates the motion to a lever 77, which brings a block 57 into the path of the needle-driving crank d to stop it when the needle is withdrawn from the work. The hook needle is carried by a needlebar which is revolubly mounted in a cross-head g. As the cross-head is reciprocated by means of the crank d and the bifurcated pitman f, an arm k on the needle-bar is moved by the four cam edges of a frame l to give a half-turn to the needle. The thread is led from a reel 23 through a thread lock 25 to a take-up bowl 28, and thence to a pivoted tubular looper 30. The thread as it passes from the loopers is engaged by a reciprocating hook 33, Fig. 16, which pulls off a supply of thread and positions it for the hook-needle. When the needle is about to engage the thread, the tubular looper 30 is turned downwards into the position shown in Fig. 16, to bring the thread horizontal, by a lever 48, one end of which is engaged by an oblique surface 38 on the frame 34 of the hook 33. The frame 34 is reciprocated by means of a lever 39, rod 42, and cam-lever 45. The takeup and the thread lock are actuated by connexion with a frame having a pawl which is engaged by a projection on the cross-head g on its work-piercing stroke. The movement of the take-up is determined by the position of a tripblock which disengages the pawl from the projection, and the trip-block is moved, as the width of the sole at the stitching point varies, by means of a cam-groove in the base of the clamp and a rod 13. The thread is tensioned by a spring 32, which presses upon it as it passes from one part of the tubular looper to the other. In a modification, the tubular looper is depressed to position the thread for the needle by a finger on a slidingly mounted plate actuated directly by a cam-groove in the frame 34.