Patent GB-513475-A (GB)
Title: Improvements in or relating to the treatment of shoe linings and to machines suitable for use therein
IPC: A43D8/04
Filed: 1938-03-31
Abstract: 513,475. Shaping shoe linings. UNITED SHOE MACHINERY CORPORATION. March 31, 1938, No. 9822. Convention date, April 1, 1937. [Class 17 (i)] A quarter lining is clamped by its margin over an opening and the part spanning the opening is stretched beyond its elastic limit to form a bulge to fit the heel end of the last. The work holder comprises a lower supporting-block 110 which can be exchanged for another with a differently shaped aperture on the removal of screws 114. The margin of the work-piece is clamped by a rubber member 236 carried by an apertured plate 226 supported by bolts 224 engaging a U-shaped member 200 pivoted on a shaft 28 at the rear of the machine and actuated by a link 204 and cam-operated arm 208. Yield is allowed by springs 222 threaded over the bolts 224. Side plates 106 are slotted to permit insertion of the work while protecting the fingers of the operator. The position of the work is determined by gauges 122 which are caused to serve as ejectors when the shaping operation has been performed. Each gauge is pivoted to rod 130 screwed into a socket 132 pivoted to an arm 136 pinned to a shaft 138, the two arms 136 being connected by a cross portion 141. The gauges are adjusted by a handwheel 170 secured to an eccentric pin 164 engaging a slide in a slot on one of the arms 136. A pin 176 engages any one of holes 172 to hold the parts in adjusted position. These parts are carried by a bellcrank lever 142 carrying a roll 146 actuated by a cam so that the gauges may serve as ejectors. The bulging member has a head 254 chromium plated or highly polished to avoid friction and consequent unequal stretching, and has a square shank adjustable heightwise in a socket by a handwheel 274. A window 250 allows graduations on the shank to be seen and its position determined. The bulge is carried by an arm 244 pivoted on the shaft 28 and actuated by a link 256 and cam-operated arm 264. The upper front surface of the block 110 is serrated at 118 to increase the grip on the work. A plate 286 on a guide-rod 282 urged upwardly by a spring 288 prevents the bulge made in the workpiece from interfering with the ejection of the work. The various parts are lubricated by oil contained in a trough 38 and conveyed by wicks housed in tubes 40. At the front of the machine is a tray 194 to receive the ejected work-pieces, and a trough 196 which may hold linings to be operated on. The cam-shaft is driven by a onerevolution clutch mechanism comprising a pin 66 sliding axially in a member secured to the cam-shaft and co-operating with holes in a collar secured to a constantly-rotating gear 52. The pin 66 is carried by a clutch dog normally held retracted by a plunger 76 connected by a chain 80 to a treadle. On depression of the treadle the pin 66 connects the parts till, the treadle having been released, a wedge surface on the dog 62 rides on the plunger 76 to withdraw the pin. When the pin has been withdrawn, the cam-shaft is stopped by a brake band 90 connected to rods 92 urged upwardly by springs 94 and resting on a ledge on the arm 200, so that the brake is released when the work is clamped.