Patent GB-920882-A (GB)
Title: Improvements in or relating to shoe bottom pressing machines
IPC: A43D25/06
Filed: 1958-06-05
Abstract: 920,882. Sole attaching presses. BRITISH UNITED SHOE MACHINERY CO. Ltd. (United Shoe Machinery Corporation). June 3, 1959 [June 5, 1958], No. 17952/58. Class 17 (1). A sole-attaching press has means 24, 26 for supporting the heel and toe ends of a shoe, gauges movable to engage the ends of a shoe and a sole thereon to position the sole, pressureapplying means to press the sole to the shoe, and means to maintain the gauges in operative position during the pressing operation and then to retract them. The machine includes means to lock the shoe against the toe end support, means to eject the finished shoe, and means responsive to pressure of the toe of the shoe on the support to operate mechanism which controls the pressure-applying means. The machine described has two identical stations. The last pin 42 is carried by a rocker 38 adjustable angularly in block 36 by means of a screw 92, block 36 being adjustable lengthwise of bracket 34 by means of screw 68, bracket 34 being adjustable heightwise with the threaded post 30 by means of a sprocket 60, and post 30 being carried by carrier 28 adjustable in an inclined guideway by means of a screw 120. Similarly the toe pad 58 is adjustable laterally of a slide 52 which is adjustable longitudinally of bracket 50 by means of screw 80, the bracket being adjustable heightwise with the threaded post 46 by means of sprocket 64, and toe post 46 being carried by a carrier 44 adjustable forwardly and rearwardly of the machine simultaneously with carrier 28, for operation on shoes of different sizes, by means of a linkage 108, 110, 114, 116. The adjusting means of the two stations are adjusted simultaneously by means of chains 102, 78, 62, 126, 90 and 66. The heel and gauge comprises a U-shaped band 128, preferably of plastic material with strengthening ribs 129, secured to a pair of arms 136 pivoted to arms 140 fulcrumed at 142 to bracket 144 which is linked at 148 to a bracket 152. The parts 152, 148, 144 act as toggles which are normally broken by springs 153, and the band 128 is tilted downwardly by springs 155. Similarly the toe gauge comprises a band 158 secured to arms 164 fulcrumed to a bracket 168 which with links 172 and bracket 176 form a toggle normally broken by spring 178. The toe gauge is adjusted, together with the toe support, relatively to the heel support by means of a cable 182 connecting bracket 176 to carrier 44. Bracket 152 of the heel gauge is connected by pivoted parallel arms 184, 186, to a bracket 190 on the carrier 28, and bracket 176 of the toe gauge is connected by pivoted parallel arms 208, 210 to a fixed bracket. The gauges are moved inwardly to engage the shoe and sole by downward movement of the piston 232 of cylinder 234 which acts via the pivoted main operating lever 204 and rods 200, 226 having pin and slot connections with levers 198, 224 which act via friction clutch members 196, 222 to turn arms 186, 210. The gauges are maintained in yielding engagement with the shoe and sole by the slipping action of the clutch members. During the initial movement of lever 204, while the pins on levers 198, 224 move in the slots in rods 200, 226, rod 266 (not shown) is moved to operate a pawl and ratchet device which acts via a friction clutch and a Bowden wire 248 to tilt rocker 38, forcing the toe of the shoe against the toe pad, and so locking the shoe in position before the gauges are moved to operative position. The pressure pad 286 in box 288 is rockable on trunnions 290 on a yoke 294, the box and yoke having complementary arcuate surfaces initially kept apart by a spring, leaf springs 310 centralizing the box and equalizing the pressure on the sole, and the yoke being rockable transversely on pins 314 on arms 316. Arms 316 have a ball and socket connection with trunnions 318 on a transverse equalizing lever 320 pivoted on a shaft carried by lever 204, spring- loaded pins between levers 204, and 320 permitting rocking of the latter to equalize the pressure of the pads at both stations. When piston 232 is operated the arms 316 swing about trunnions 318 from their normal inclined position, Fig. 1, to a substantially vertical position, and then move downwardly, being guided by rolls 328 engaged in cam slots 330. As the pad box moves downwardly it engages the tops of the toe and heel bands 128, 158, and then straightens toggles 144, 148, 152 and 168, 172, 176, the frictional drag of the gauges 128, 158 on the outsole effecting a preliminary spotting of the sole to the shoe at the heel and toe. When lever 204 returns, after completion of the pressing operation, a gear segment 376 attached thereto acts via pinion 374, an eccentric pin, a latch member, and a bell crank to pull a Bowden wire which swings an ejector plate hinged to rocker 38 to remove the last and shoe from pin 42. Arms 316 are maintained in their inclined positions when the machine is inactive by a spring 422 acting via levers 412, 418. The electric and hydraulic circuits are desscribed and illustrated and include a pair of buttons which must be pressed concurrently, i.e. using both hands, to initiate the operating cycle, and one of which must be depressed until switch 406 is closed by a cam surface 404 on segment 376, i.e. when the pad boxes have been moved into position, a holding circuit completed by a microswitch actuated by a spring- loaded rod 400 when the toe of the shoe presses the toe pad as the shoe is locked in position, and a timing device to control the duration of the pressing operation.