Patent GB-492671-A (GB)
Title: Improvements in or relating to shoe bottom pressing means
IPC: A43D25/06
Filed: 1937-03-24
Abstract: 492,671. Boot - - making machines. UNITED SHOE MACHINERY CORPORATION. March 24, 1937, No. 8579. Convention date, March 30, 1936. [Class 17 (i)] Laying.-A machine for applying pressure and heat to the marginal portion of upper materials laid on an insole before the outsole is applied comprises flexible resilient plates shaped to conform to the contour of the shoe bottom lengthwise of the shoe and moved alternately into operative position. The pressing devices are mounted in pairs for turning movements about an axis extending lengthwise of the shoe. They are heated only when they are in inverted position, thus ensuring against applying excessive heat to the shoe. The flexible plates are movable laterally of the shoe in wiping contact therewith, and are backed by other flexible plates, themselves backed by a mass of loose elements, preferably, metal balls. The machine is of the general type described in Specification 216,937 comprising twin mechanisms whereby one shoe is subjected to pressure while the other shoe of the pair is changed at the other station. Each of the twin mechanisms comprises a pair of rods 20 supporting a cross-head 22 carrying a plate 24 along which an abutment 26 is slidably adjustable, the abutment carrying a toe pad 30 and last pin 34 constructed and operating as described in Specification 467,583. Each sole pressing device is carried by a casting 42 supported by a spring 44 from a slide 36 actuated as described in Specification 216,937, [Class 17 (i)], by toggle levers 38 operated by a half-revolution clutch, a strong spring 252 allowing yield. Each of the pressing devices comprises a block 122 hollowed at top and bottom to house metal balls 166 retained by a fence comprising pins 170 each backed by a spring 180 and abutting against thin metal plates 172 formed with staggered slits 176, themselves abutting against a pair of plates 124 retained by a spring clip 148 and members 152. The plates 124 move inwardly to iron the marginal edges of the upper, and are actuated by side bars 130 having tail portions slotted to engage the heads of bolts 142 and urged outwardly by spring plungers 144. Between the members 152 is a leather pad 158 for engaging the heel seat face of the shoe, this pad being secured to a member urged outwardly by springs 156. The plates 124 are urged away from each other by springs 132, and are moved towards each other by plates 266 actuated by racks 258 gearing with segments 262 pivoted to the casting 42 and connected by links 264 with the slide 36, so that when the pressure on the shoe begins to rise and the spring 44 yields, the plates are advanced. The lower pair of plates 124 are in contact with a block 58 which is heated electrically. The block 122 is supported by trunnions engaging bars 66 sliding in the member 36. At one end the trunnion carries a disc provided with four pins 116, which are used to rotate the device half a turn for each consecutive operation, to bring freshly heated plates into action. The pins are actuated by teeth 118 on an arm 100 pivoted to a slide 98 and urged anticlockwise by a spring 106. The arm 100 has a flat 120 to engage two pins at the same level. The slide 98 is actuated by a telescopic link 101 by a treadle 90, also actuating a telescopic link 85 connected to an arm 76 secured to a rock-shaft 72 carried by the slide 36. Arms 84 connect the rock-shaft with the slides 66, these slides being, normally, urged upwardly by a torsion spring on the rock-shaft. Slotted links 54 connect the slide 36 and casting 42. Specification 294,640, [Class 17 (i)], also is referred to.