Patent GB-190100987-A (GB)
Title: Improvements in Boot and Shoe Sewing Machines
Filed: 1901-01-15
Granted: 1901-03-16
Abstract: 987. Lake, H. H., [Loop-Lock Machine Co.]. Jan. 15. Boot-sole stitching-machines; lockstitching machines locking loops by free loops of under thread; loop-stitching machines; waxthread machines.- Consists of an improved machine for producing stitching of the kind in which loops of waxed thread 1, Fig. 12, drawn through the work by the needle, are locked by loops of light dry thread 2. The operation of the machine is as follows:-The jaws 8, 9 close together on the work and feed it, and the presser 12 advances in such a way as to have a stretching or lasting action on the upper. The curved needle 3, with a hook on its concave side, now penetrates the work, and withdraws with a loop of thread, through which the looper 7 then advances and draws a loop of locking-thread. The needle loop is then cast off, and tightened on the locking-loop, from which the looper 7 withdraws just before the tightening is complete. The machine as described is for turnshoe work, but may be adapted for welted work by fitting a welt guide to the jaw 8. The looper 7 moves in the plane of the needle path, and parses through the needle loop from outside the needle path, so that the locking-loop is drawn through the needle loop from the top to the bottom side of the latter, and thus lies flat on the sole. The looper is moved by a rocking arm 96 and a link 104. Feed; presser-feet ; presser lifted automatically.- The jaw 9 engages the sole channel, and the jaw 8 the upper. They are formed on sleeves which can slide and rotate on the shaft 16, which carries the needle segment, these sleeves having a tongue-and-groove connection, so that they receive a common lateral feed motion from a lever 75 of adjustable throw. The jaw 9 is moved by a positive connection 63, but the jaw 8 by a connection 72, 81 comprising an adjustable spring. The jaw 8 is locked while the needle penetrates the work by an arm 85, which is moved into engagement with a shoulder 74 on the sleeve of the jaw by a rod 87, shown in part only, operated through a light adjustable spring 91. The slide 115 carrying the presser 12 is reciprocated by a frictional connection with the lever 34, and receives its final forward motion through an adjustable spring 122 secured to lever 34. The slide 115 is supported at the front by a pin 118, engaging a slot 117, which is inclined so as to give the presser a vertical movement. Needles, hook, threading-devices for.-The thread is laid in the needle book by two fingers 5, 6, shown in plan in Fig. 12. secured to an arm 30 pivoted at 31 to a slide 32 reciprocated by the lever 34. The slide 32 is frictionally pressed against a pivoted tongue engaging in the slot 40, and is thus tilted vertically at the beginning of each reciprocation, to an extent limited by the pin 47, and slot 46 in the slide. The lateral movement of the thread fingers is effected by the pin 37, Fig. 12, engaging a slot 141 in the arm 30. Needles, hook, cast-off devices for.-The castoff 11 moves in the plane of the needle path. Its slot 105, Fig. 18, passes over the needle to lift the thread from the hook. The cast-off lever is pivoted at 107, and operated by the movement in a slot 108 at its upper end of a pin on the arm 96. Governing under thread.-The channel guide, Fig. 20, carries a bracket with a hole 54, through which the locking-thread is led and which is so situated that, as the work is fed, the locking-thread is stretched at right-angles to the plane of the needle path. Slight tension is applied to the locking-thread by a flat spring through a hole in the free end of which it passes, and which is caused to press on the thread when the thread is pulled. Governing needle thread.-Thread for the needle loop is pulled off by a finger, the movement of which is partly dependent on the movement of the feed-lever 75. Needle shields.-The needle guide 18 is operated from the needle segment through a pin-and-slot connection acting against a spring.