Patent GB-190318348-A (GB)
Title: Improvements in Boot and Shoe Sewing Machines
Inventor: DOUCET FELIX
Filed: 1903-08-25
Granted: 1903-11-05
Abstract: 18,348. Doucet, F. Dec. 19, A.D. 1902, [date applied for under Patents Act, A.D. 1901]. Boot-sole stitching-magchines; lock-stitch shuttle sewing - machines. - The outer sole, upper, and inner sole of a boot or shoe are sewn together by a machine having a rotary horn a, which is inserted in the boot or shoe upper, the machine being of -such a nature that a lock-stitch is formed without any liability of the reeving of the needle thread in the barb of the needle, during the formation of the needle loop. A circular shuttle h, provided with thread hooks h<1>, is supported above the horn on antifriction rollers carried by an-arm i, the shuttle receiving a reciprocating rotary motion from a gear-segment j the teeth of which gear with teeth on the periphery of the shuttle. An idle pinion k also gears with the shuttle, and assists in holding the latter in its proper position. Governing needle thread; governing under thread; wax-thread machines; needles, hook, threading- devices for.-The needle thread passes from the source of supply, through a wax-pot (if waxed thread is used), round a tension-wheel o<1>, over guide-pulleys, to a take-up device m, and from the latter through a rotary whirl b driven by bevel gearing. The take-up m consists of a pulley mounted on a slide m<1> which receives a reciprocating motion from a combination of levers m<3>, m<4>, oscillated by a rod m<5>. To prevent the thread from reeving in the barb of the straight needle g, a portion of the needle thread is stored up before, and given out during, the ascent of the needle, by a thread retainer n consisting of an elongated slender arm with hooked end. The thread retainer is fixed to a slide n<2> which moves in a path parallel to that of the take-up slide. As the latter moves forward, a spring dog t<1> attached to the take-up slide, engages with a recess r<2>, Fig. 12, in a flange r forming part of a spring latch, which flange projects through a slot in an operating slide, so that the latter is moved forward until a flange r<3> on the latch is depressed by a fixed plate s'. At the same time the thread retainer moves inwards and causes its hook to draw out a bight o<2> in the needle thread. This inward movement causes another spring dog t attached to the take-up slide to engage with a similar latch on the thread-retaining slide n', which moves the thread retainer into its thread-releasing position, when the latch is depressed by contact with a fixed plate s. In operation, the needle descends until its book passes through and below the whirl, which then throws a bight of the thread into the barb of the needle. The needle then commences to rise to form the needle loop, and the take-up slide moves forward, releasing thread to the needle until the needle loop has been engaged by the shuttle hooks, and carried beyond the highest part of the shuttle, when the takeup slide moves backwards and sets the stitch. A loop spreader is added to assist the needle in holding the loop open to receive the hooks of the shuttle. Work-supports.-A fixed plate w, located in the top of the horn, has an orifice w<l> coinciding with the needle orifices in the top of the horn. The plate serves to hold the whirl in place, and to keep the needle thread in a central position above the whirl to ensure its engagement by the hook of the thread retainer.