Patent GB-763458-A (GB)
Title: Improvements in or relating to the conforming of shoe uppers to the shapes of appropriate lasts
IPC: A43D23/00
Filed: 1953-11-10
Abstract: 763,458. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and BARTON, G. C. Nov. 9, 1954 [Nov. 10, 1953], No. 31052/53; Class 17 (1). A machine for conforming the toe parts of shoe uppers on lasts and for securing the marginal parts to the shoe bottom member by adhesive comprises supporting means for a shoe upper on a last, upwiping means 224, an upper spreading device 26, and means to effect relative heightwise movement between the supporting means and the upwiping means, while the upper is pressed against the upwiping means by the spreading device, to tension the toe portion of the upper prior to inwiping. The spreading device, which acts, initially, as a toe gauge to position the shoe lengthwise of the machine, is moved heightwise and heelwards to a position opposite the shoe bottom and then toewards to spread the upper over the upwiping means. The wipers advance between the upwiping means and the spreading device to urge the upper inwardly over the shoe, and then presses the margins while the adhesive partially sets. A holddown member: 54 holds the margins of the shoe bottom member against the last during the early inwiping action, but is retracted before that wiping is completed. The rubber pad 28 which supports the upper on the last is slidable vertically on a post 36 which is resiliently mounted on a spring 44 (Fig. 2), the height of the support in the machine being adjusted by rotation of member 48, and nut 50 limiting upward movement of post 36 and being used to adjust spring 44. The shaped holddown plate 54 mounted on a bracket 62 is urged downwardly by spring 85. The bracket is rotated on post 94 by handle 100, against spring 104, to swing plate 54, inwardly, rearwardly, and downwardly to operative position, the rotation being limited by pin 96 in slot 98, and pin 96 being raised or lowered by knob 103 to adjust bracket 62 heightwise relatively to post 94. When thus positioned the holddown is urged against the shoe by the depression of post 94, by means of a jacking treadle 130 via 122, 124, 126, and is secured in clamping position by the locking of post 36 and post 94, which remain locked when the treadle is released. Locking member 140 is freed when spring 186 is overcome by downward movement of post 94, and is then swung by spring 184 to lock post 36, but to prevent unlocking of post 36 when the holddown is retracted arm 437, which is swung as the wipers advance, acts through 672 to swing arm 666 so that cam face 668 rides over roll 674 on pin 160 and prevents movement of the bell-crank by spring 186, unlocking occurring when arm 437 is swung anticlockwise when the wipers are fully retracted. Post 94 is latched by plate 196 under the influence of spring 206, the plate being released by movement of lever 216 during overwiping. If the shoe is not correctly located post 94 is unlatched by movement of knee-pad 760 which through 762, 764/766, 774, 778, 780, 784, and 786 moves link 210 and so withdraws latch plate 196. Toe gauge 26 with extension 222 is lifted, via 234, 244, when hand lever 258 is moved rearwardly, and then moved heelwardly over the upstanding upper margin, via 234, 238, 254, 250 when the movement of the lever is continued. When the lever is moved forwardly the gauge is first lowered into engagement with the shoe bottom member, via 244, 234, and arm 238 is latched forwardly by plates 264, 272, but on continued movement of lever 258 arm 238 is freed via 244, 266, and the gauge is then moved rearwardly, via 252, 256, 238, to spread the upper over the toe band. The gauge is then moved downwardly by spring 262 to clamp the upper against the toe band 224 which is opened or closed by rotation by means of handle 440, of rod 434 which swings levers 368, 370 (not shown) connected to the ends of the band. Stop 406 limits rearward movement of the centre of the band when the shoe is pressed thereagainst. The band is supported on a parallel linkage including bracket 346, links 350, and cradle 356. When the upper is clamped between gauge 26 and band 224, the latter is raised, to tension the upper, by swinging cradle 356 by means of rocking treadle 409 via 422, 420/418, 416, 414, 410, 365, and 362, both up and down movements being limited by stops. The pivoted heel rest 490 (Fig. 2) is adjustable widthwise at 500, 499, heightwise at 510, 513, and lengthwise at 504, 521, is urged towards the shoe by springs 525, and is locked when shaft 166 rotates, as a result of the movement of post 94 which causes the locking of post 36, and frees pawls 536 for engagement with teeth 535 on segments 534. Wipers 226 partake of the heightwise movement of the toe band while in retracted opened-apart position, and when the toe band has been moved to tension the upper the wipers are advanced and closed, being forced beneath member 26, by forward movement of lever 336 through 334, 330, 326, 322, 320, 447, 445, and yoke 439 connecting arms 435. The wipers are supported on a carrier 431 supported on a parallel linkage including arms 443, 435, and a cross shaft between arms 443 is supported on cradle 356 so that the wipers and toe band are raised and lowered together, wiper holders 448, with heating elements 460, have arcuate grooves 450 and walls 456 engaging arcuate ribs 452 and walls 458 on the carrier. Studs 468 on the holders pass through slots 465 in a cover plate and are connected through 471, 470, pivoted to carrier 431, 478, 484, 485, 488, 489 to arm 445. As carrier 431 advances relatively to bracket 346, links 478 move forwards more rapidly than the carrier and so swing levers 470 to close the wipers. As yoke 439 rotates clockwise during this movement shaft 360 rotates, and through lever 216 moves member 196 to allow retraction of the holddown. To prevent the heated wipers from marking the upper, the wipers commence overwiping at a slightly higher level than they complete the movement, this dipping being brought about by lowering the front of carrier 431 at the desired time, as follows. When lever 336 is swung forwardly to close the wipers, arm 596 on shaft 322 is rotated clockwise and through 598, 602, 582, 584, latch arm 588, and plates 592, 594 latches cam member 578 to carrier 582, and on continued movement of lever 336 the portion c of cam 576 rides past roll 574 on arm 568 and swings lever 568/566/ 606 anticlockwise so that link 560 swings arm 558 to rotate shaft 446, and an eccentric portion 556 thereon acts through arms 443 to lower the wipers. The extent of the movement is determined by the setting of stud 564 on link 560 along slot 572 on arm 566. When lever 336 is swung rearwardly arm 596 rotates anticlockwise to engage 600 with 602, and during this movement 612 depresses 592 to free 594, and member 578 rocks clockwise. Since roll 574 is in portion b of the cam 576, this rocking allows lever 568/566/606 to rock clockwise to relieve the pressure of the wipers immediately.