Patent GB-514171-A (GB)
Title: Improvements in or relating to heel seat lasting machines
IPC: A43D113/00
Filed: 1938-04-28
Abstract: 514,171. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., PRATT. J. W., BARKER, W. A., and CLARKE, G. April 28, 1938, Nos. 12662 and 35756, [Class 17 (i)] A heel end lasting - machine of the kind described in Specification 391,451 is provided with an auxiliary heel band and a toe pincer actuated by a treadle to facilitate the conforming of the rear end of the upper to the last while the jack is in work receiving position, prior to the actual carrying out of the heel end lasting operation. This mechanism takes the place of the clamping pads described in Specifications 416,871 and 460,023. The last pin 2 is carried by a block 4 free to rock about an axis longitudinal of the shoe in a block 6 itself free to rock about an axis transverse of the shoe. Between the block 4 and the last is a plate 3 engaging the crown of the last. The block 4 supports guideways 13 in which are clamped, for vertical adjustment, side members of a generally U-shaped frame 15 having at its ends bosses 17 supporting bushes 19 on which a second U-shaped frame 21 is pivoted. Central of this frame is an upwardly curved lug 23 supporting a pivot 24 for a depending lever 25 urged forwardly by a spring plunger 29. An upstanding ear on the lug 23 is recessed to engage the central part of a right-and-left-hand screw 35 threaded through studs 36 providing pivots for a pair of levers 37 carrying the auxiliary heel band 5. This band is of thin flexible metal lined with leather and is carried by pins 38, which are disconnected from the levers when it is desired to change the band for another of different size. The lower ends of the levers are pivoted to the heads of pins 39 sliding in the bushes 19 and urged inwardly by springs 40. The ends of the heads are recessed to support dumb-bell links 41 the inner ends of which engage similar recesses in the lever 25. The levers 37 are also restrained by yokes 47 on the frame 21. This frame also carries the toe pincer, arms 51 projecting from the frame being pivoted to L-shaped members 53 connected to form a guide for pin 57 the head of which carries a bar 63 vertically adjustable by a slot and screw 61. The upper end of the bar 63 is bifurcated and carries a pivot 75 for the lower jaw 79 of the pincer, which is urged rearwardly by a spring plunger 87. To the jaw 79 is pivoted the upper jaw 81, which is linked to a lever 99 urged rearwardly by a spring 105, the lower end of the lever engaging a spring 111 threaded over a rod 107 connected by a pair of cables 117 to one end of a lever operated by a treadle. The other end of this lever is connected by a cable 127 to the lower end of the lever 25. The normal position of the bar 63 is governed by an adjustable screw 71 against which the bar is urged by a spring 67. In operation, a loose heel seat piece. Veldtschoen upper and stiffener are assembled on the last and this spindled on the jack. The operator places the toe end of the upper between the pincer jaws, hoists the heel end of the upper heightwise to provide the desired width of upper margin to be wiped over by the heelseat wipers, and depresses the treadle connected to the cables. The toe pincer closes and rises somewhat, to exert a foredraw and upward tension on the upper, and the band 5 moves towards the heel end of the shoe and closes about it. The lower portions of the band first contact with the upper. The springs 40 prevent inward movement of the upper ends of the levers 37 until the band has engaged the upper firmly. Meanwhile the frame 21 is swung anticlockwise, effecting a corresponding swing of the pincer. Further depression of the treadle causes the springs 40 to yield and the upper ends of the levers 37 to carry the forward portions of the band into firm clamping engagement with the upper. An abutment 139 on the lever then engages a catch 141 pivoted on the frame 15 and holds the band in final position. The toe pincer also is held by a latch 131 engaging a nose at the lower end of the rod 107. The jack may then be swung backwards into the machine for the heel seat lasting operation. At the conclusion of this operation, as the jack swings forward for work changing, the catch 141 is released by engagement with its tail of a lever 147 pivoted to an arm on the jack sleeve. The lever 147 is urged to inoperative position by a spring 157, and actuated by a spring plunger 151 which co-operates with a fixed plate 161 as the jack sleeve swings. Specifications 235,286. [Class 17 (i)], and 482,666 also are referred to.