Patent GB-190218653-A (GB)
Title: Improvements in or relating to Sewing Machines.
Inventor: LEE JOB
Filed: 1902-08-25
Granted: 1903-07-02
Abstract: 18,653. Lee, J. Aug. 25. Boot-sole stitching - machines; leather-sewing machines; frames; driving.-Relates to sewing- machines of the type used for stitching soles to the uppers of boots and shoes, and for harness-making, and other purposes. Fig. 1 shows a general view of the machine. The casting or head 1 of the frame supports the stitch-forming mechanism in front, and, in the rear, the main shaft 2 carrying the operating - eccentrics and driving - pulleys 3, which are operated by a band from pulleys at the foot of the machine. Needle - holders; needle - driving perforating- devices.-The needle 7, Figs. 1 and 2, and the awl 8 are carried on levers which are arranged loosely on a short fixed shaft 5, and are operated separately through rods 11, 12 by the eccentrics 13, 14 on the shaft 2. Work-supports; presser-feet ; feed.-The slotted work-support 16 is carried by a sleeve 15, which receives motion laterally on the shaft 5 between each stitch, to give the feed, the work being held up against a presser-foot 17 screwed to the head 1 of the machine. The lateral movement of the sleeve 15 and work-table 16 for the feed is obtained by means of a pivoted lever 18, Fig. 1, one end 20 of which acts on a guide-bar 21 attached to the sleeve, the other end terminating in a roller bearing against a side cam 24 of the disc 25. The return movement of the feed-lever is effected by a pin 26, which is backed by a spring contained in a chamber in the fixed shaft 5. The length of the stitch is varied by a hand-lever 29, the top end of which is wedge-shaped, and passes behind a projection on the feed-lever 20 by means of which the motion of the work-support is controlled. As the awl pierces the work, and the stitch is being formed, the work and the worksupport are held up against the presser-foot, and thereby locked in position, by means of a curved arm 31, Fig. 2, which depends from a lever extension 32 of the work-supporting sleeve 15 ; this arm is engaged by part of the opposite faces in a bifurcated block 33, which is carried on a rocking lever 35, pivoted at 36 and worked into and out of the locking position by cams 37, 38 on the periphery of the disc 25. Extensions 41, 42 are provided on the lever extension 32 and on the rocking lever 35, respectively, so that the operator, by pulling at 41 and depressing 42, can unlock the work-support at any time. A spring 59 connected to the lever extension 32 controls the locking- device, in connection with a spring-controlled pin acting on the extension 42 of the rocking lever 35. Chain-stitching machines ; governing under thread. -After the awl has pierced the work and has been withdrawn, and the needle passed through the hole, the looper 43, Fig. 2, carried by the arm 44 on a shaft 47, wraps or twists the thread round the needle, which then draws up the thread to form the loop. The shaft 47 is capable of partial rotation by means of a face cam 49 on the disc 50 working on roller 51 on the lever arm 52, and longitudinal motion by means of a second cam 55, so that the looper 43 has a sliding and turning motion, which wraps the thread round the needle.