Patent GB-468439-A (GB)
Title: Improvements in or relating to machines adapted for attaching a heel to a shoe and applying a covering flap concurrently to the breast thereof
IPC: A43D25/12
Filed: 1935-12-05
Abstract: 468,439. Boot - making machines. UNITED SHOE MACHINERY CORPORATION. Dec. 5, 1935, No. 33671. Convention date, Dec. 17, 1934. [Class 17 (i)] Heels, machines for.-In a machine for attaching a heel to a shoe by cement and applying a breast-covering flap to the heel a pivotally mounted pad is moved from out-of-the-way position to engage the flap at the shank end and apply it progressively to the heel, a resilient fork is provided to centralize the heel on the shoe, clamping members engaging the tread end of the heel and the back or sides, respectively, are connected by pressure equalizing gearing, an apron is provided for preventing a clamping pad marring the surface of the heel visible in wear, and a cutter is provided which automatically severs surplus material at the end of the flap. The shoe is positioned on a last pin 30 slidable forwardly and rearwardly and also laterally of the machine, adjustable angularly, and adjustable vertically by a hand wheel 46. An end gauge 50 is adjustable forwardly or rearwardly, and vertically, and the work is further located by a resilient fork 56 hung on an adjustable support 58 in the path of a bifurcated member 68 at the lower end of a slide 74. This member has headed screw pins 72 for contacting with the part 56, and the slide 74 reciprocates in a slide 76 provided with teeth engaged by a segment 106 actuated by a treadle rod 110. To the slide 76 is pivoted at 90 a guide 84 for a second slide 82, the guide 84 being adjustable about its pivot by a clamping screw 97 and slotted link 102. The slide 82 carries the tread clamp 66, and the slides 74, 82 are each provided with rack teeth engaging a pinion on the pivot 90, so that the pressures exerted by the two slides are equalized. The breast-flap-laying pad 136 is of rubber, centrally grooved where it contacts with the shank, and is carried by a plate 174 adjustably secured to a pair of arms 150 each pivoted at its lower end to an arm 148 provided with stop screws 154 for determining the normal position of the pad, springs 158 urging the pad to this position. The arms 148 are pinned to a shaft 128, also carrying a lever 124 connected by toggle links 122, 120 to a lever 117 linked to handle 112, which brings the pad into operative position. The lever 117 has arms 130, 132 for limiting its swing by engagement with the pivot of the handle. The other end of the lever 124 is connected to a rod 126 urged upwardly by a spring 134 and engaging arms of a member 138 pivoted at 108 and carrying pawls 160 the tails of which are connected by a rod 175 with the upper end of the toggle, springs 170, 173 being provided above and below the pivot. The pawls co-operate with a toothed segment 166 secured to the shaft 108 carrying the segmental gear 106. The tread rest carries an adjustable shear plate 186 co - operating with a knife 190 normally urged to inoperative position by a spring 196 but caused to sever the surplus end of the flap by pressure of the pad 136. In operation, a shoe having been positioned against the back gauge 50, a heel is applied and the treadle depressed, the member 56 first centralizing the heel and then engaging the rim of its attaching face to force the same against the shoe. Simultaneously the tread clamp is depressed, the two slides 74, 82 exerting preliminary equalized pressure. The breast flap 24 is then turned up against the heel, and the handle 112 is raised. As the toggle straightens, the pad contacts with the shank and then progressively with the heel breast, finally actuating the knife to sever the surplus of the flap. Simultaneously the pawls 160 are released to engage their segment and depress the slide 76 to increase the clamping pressure on the heel. The handle may then be raised and the work removed. In a modification, the lateral positioning of the heel may be manual, the slide 74 then carrying a pad 204 engaging the rear of the heel. A leather apron 208 is interposed between the heel and the pad to prevent damage to the heel cover. If the trimming knife is not required, the tread clamp may comprise a member 212 at the lower end of the slide 82 the member being slotted to engage a pin 218 and self-adjusting in an arcuate guide.