Patent GB-295979-A (GB)
Title: Improvements in or relating to relasting machines
IPC: A43D3/12
Filed: 1927-05-20
Abstract: 295,979. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). May 20, 1927. Putting shoes on lasts.-A machine for placing a shoe unit, comprising a sole and an upper, upon a last is provided with means to prevent the force which effects this operation from exceeding a certain magnitude. This 'force may be varied during the operation of the machine, and may be applied through a rubber roll, the actuating mechanism for which may include an auxiliary friction clutch adapted to slip when the toe of the shoe has become seated on the last. The invention is described as applied to a re-lasting machine for placing a shoe unit S, the toe of which has been placed by hand on the toe part of the last L, as shown in Fig. 1, upon the last. The last L is mounted on a pin P on a carrier 110 which can be moved about its pivot 112 into the position shown at Fig. 1, for applying a shoe unit S to the last, or to the position shown in Fig. 22 for removal of the last L and unit S. The last pin P is yieldingly maintained in a position to receive a last by a spring-pressed bar 118 and is held rigidly during re-lasting by a latch bar 120 which engages a notch in the carrier 110. The bar 120 is tripped at the end of the relasting operation by a shoe horn R which oooperates with a roll R in the re-lasting operation, and the bar may be tripped manually also if desired. The machine is started by depressing a treadle 54 to trip a catch, which releases a spring- pressed clutch shifting lever 56, to throw in a main clutch 28. This main clutch is thrown out by a stop cam 52, which actuates the clutch shifting levers 56, to divide the operation into a number of distinct stages, each of which is started by depressing the treadle 54. The periods of rest between the stages may be utilized by the operator to do any necessary work upon the shoe, or they may be cut out by depressing a treadle. The roll R, which is of soft yielding rubber with a circumferential groove at the centre, is secured on a horizontal shaft 134 journaled in bearings on a slide 138 mounted on a carrier 140 which is pivoted on a horizontal shaft 142 journaled in the upper part of the machine. The floating end of the carrier 140 is raised, to bring the roll R into contact with the shoe bottom forwardly of the ball line, so as to temporarily to broaden the forepart of the upper, to facilitate entry of the fore part of the last, and to hold the last firmly against the last pin. The roll R is raised by a pivoted camlever 146 the inner end of which is actuated by a cam 44 on a main cam-shaft 40 and the outer end of which is connected to a sleeve 164 slidingly mounted on a rod 160 which is connected by a screwed sleeve 158 to a pair of links 152 attached to the floating end of the carrier 140. This construction permits the roll to be raised into contact with the shoe and pressed against it by a spring 162 which extends between the sleeves 164, 158, and the initial compression of -which may be altered by turnings the rod 160 in the sleeve 158 by a hand-wheel on a shaft 182. The position at which the roll engages the shoe lengthwise may be adjusted by adjusting the slide 138 relatively to the roll carrier 140 by a hand-wheel 216. After the roll R has been raised the main clutch is slipped by the stop-cam 52, and the machine is stopped. The treadle 54 is then again depressed to drive the roll R and, shortly afterwards, to move the shoe-horn H. The relasting roll R is driven from the main shaft 22 through an auxiliary friction clutch 220 the members of which slip if excessive resistance is,offered to turning of the roll, the members being held in engagement by a spring 268 which is operated on by a bell-crank lever actuated by a cam 46 through a bell-crank lever pivoted on a, fixed shaft 90. A hand-wheel 292 is provided to vary the tension on the spring 268 and to vary the force at which the clutch members slip. The shoe horn H may be of any kind, that shown in Figs. 6 and 7 being in two parts 300 rigidly mounted on carrier-members 302 pivoted on a pintle 304. One of the carrier-members 302 engages the pin 124 of the latch bar 120 to release automatically the last pin carrier 110 when the horn H reaches the end of its operative movement. The horn H swings about the lower rear edge of the last until the re-lasting is complete, when the horn is withdrawn, the path of the pivot pin 311 being as indicated by the dotted line 318, Fig. 1. The-bracket 310 which supports the horn H is secured to the upper end of a tubular support 312 mounted for telescoping sliding movement on a rod 314 pivoted at its lower end on a shaft 316. The tubular support is raised and lowered to give the necessary movement to the horn H by a lever 370 actuated by a cam.and is swung outwards and inwards by a cam 48 operating'through linkage 336, 342, 334, 344, 346. The amount of compression of the spring 342 mav be varied by means similar to those employed for the springs 162, 268, by a hand-wheel 368 to varv the amount of tension exerted on the shoe counter. An adjustable hand grip 510 carried by the slide 138 is provided to facilitate the application of heavy hand pressure to the fore part of the shoe by the operator during re-lasting. The re-lasting operation is completed, the horn H is withdrawn, the last pin carrier is unlocked and the roll R is retracted before the end of the second stage of the operation. The shoe S and last are removed during the interval of rest after the second stage, and on depression of the treadle 54 for the third stage the shoe horn H is returned to its initial position. One or other or both of two treadles 460, 484, Fig. 8, may be provided to rotate and retract respectively the re-lasting roll R independently of the cams which normally control these movements. The treadle 460 may control also the pressure at which the friction clutch 220. slips. A modified form of shoe-horn with a. projection on its convex side to smooth out the shoe upper at the rear end is described. Means for swinging the roll R bodily in a horizontal plane to the right or left to such an extent that when the last is swung a corresponding amount about the last pin P to contralize the ball of the shoe relatively to the roll, the median line of the heel portion of the last bottom will lie in the line of pull of the shoe horn, but the direction of push of the roll R on the sole will be unchanged, may be provided to adjust the roll in accordance with the " swing " of the last. The roll R may also by tiltably adjusted crosswise to adapt it to variations in " pitch " of different last bottoms, and these two movements may be linked in a ratio which may be varied so that the roll R may be adjusted for " swing " and " pitch " by a single movement of a hand lever, with zero correction at the centre position and corrections for right and left shoes at the two extremities of the movement.