Patent GB-473197-A (GB)
Title: Improvements in or relating to heel-seat-lasting machines
IPC: A43D21/12
Filed: 1936-04-07
Abstract: 473,197. Lasting-machines. UNITED SHOE MACHINERY CORPORATION. April 7, 1936, No. 10199. Convention date, April 19, 1935. [Classes 17 (i) and 89 (iii)] In a heel-seat lasting-machine of the kind described in Specifications 235,286, [Class 17 (i)], and 351,386, the end-thrust on the cam assembly is minimized by providing separate cams for the longitudinal movement and the closing movement of the wipers, and arranging the respective slide members actuated by these cams to move in opposite directions. The heel band is adjustable for right or left shoes by moving the toe-ward ends of the band laterally, in the same direction, simultaneously. The tack drivers are actuated by weak springs when no shoe is in the machine, or when the tacks are required to be partially driven only. When the tacks are to be fully driven, stronger springs actuate the drivers in addition to the weaker springs. The shoe is depressed at the end of the cycle to clear the heads of partially driven tacks from the openings in the wipers through which the tacks have been driven. The heel post 14, Fig. 2, supports a last pin 8 which is selfadjusting about axes longitudinal and width .wise of the shoe. and also carries a bar 16 along which is adjustable a carriage supporting a toe rest 18. This rest is vertically adjustable by a pinion gearing with a rack on the toe post and is held in the position to which it has been raised by a pawl engaging a ratchet wheel secured to the pinion. The heel post is slidable in a holder 34 pivoted on two pins 36, Fig. 19, to a member 46 itself pivoted at 78, Fig. 2, to the frame. The lateral swing provided by the pins 36 is adjustable, a handle 48, Fig. 19, being provided for moving a plate formed with a tapering slot cooperating with a wedge, the slot and wedge being carried on the members 34, 46, respectively. A centralizing spring is provided. A screw 66 engaging the lower end of the post 14 rests on a cap 68 itself supported by a rod 72 secured to a slide 76. For swinging the jack about its pivots 78, to and from operative position, the member 46 is provided with upwardly extending arms 82, Fig. 7, to which a bar 84 is pivoted, the bar being slidable in a holder 86 and formed with rack teeth gearing with a pinion 156 on the shaft of which the holder is pivoted. A pin 90 limits the forward swing of the jack, and a counterweight 92, Fig. 2, partially balances it when it is in the work-receiving position shown. The jack is moved to operative position by a treadle 98 connected by a link 106, Fig. 19, with a lever 108 tending to raise the slide 76 and, therefore, the heel post, as well as swing it rearwardly. A pin 113, Fig. 7, on the bar 84, engages a spring plunger 114 as the jack reaches operative position. The slide 76 is also controlled by power, a slot therein housing a roll 118, Fig. 19, at the end of a lever 116 provided at its other end with a curved rack bar 120 gearing with a pinion 122 secured to a ratchet wheel 126 actuated by pawls on a carrier 130 oscillated by a link 142, yield being provided by a spring 144, from a lever arm 138, Fig. 17. The pawls may be given a variable amount of lost motion by a hand wheel. The arm 138 is integral with a sleeve member 139, as is also an arm 172 actuating a pawl carrier similar to the first actuating the pinion 156. A cam-operated arm 186 turns a member 194 carrying a pin 198 normally engaging a lug 200 secured to the member 139 to swing the arms 138, 172 counter-clockwise to swing the shoe positively into the heel-band. Prior to this positive rearward motion, however, the jack is given a yielding rearward swing, to press the shoe against the heel-band, while this is open, by a separate cam-operated slide yieldingly actuating pawls engaging a second ratchet wheel on the shaft of the pinion 156. The is supported for slight vertical and longitudinal play. Arms 266, Fig. 8, pivoted at 264, carry pivoted blocks 268 engaging the band 2 opposite the corners of the heel, each arm being backed by a spring plunger 270. Similar blocks 254 at the ends of the band are carried by slides adjustable on arms 258 pivoted at 260 and connected to bell-crank levers 306, segments 312 thereon engaging racks 314 connected by a lever 318 normally prevented from turning but pivoted on a slide 316 connected by a spring 322 with a slide 324, Fig. 7, actuated by a, sector 326 integral with the sleeve member 139. To vary the distance that the wipers will advance over the heel end of the shoe, the support for the rear end of the band is adjustable, this support comprising a slide 248 formed with teeth gearing with a pinion 290 which can be turned by an arm 294, Fig. 8, held in adjusted position, by a spring detent. The adjustment of the forward ends of the band towards or away from each other for width of shoe is effected by movement of the slide 316 relatively to the slide 324, a bushing 328 forming the abutment for the rear end of the spring 322 being rotated by a pinion 336 actuated by a knurled hand wheel at the front of the machine. The lever 318 is turned to effect simultaneous movements of the rack bars 314 in opposite directions, to adjust the band for the opposite shoe of a pair, by an arm 348, Fig. 7, normally held stationary by a detent. Should the machine be brought to a standstill by the resistance of the work, e.g. at the beginning of the second over-wipe, the pin 196 may be turned to allow a flat thereon to clear the lug 200. For this purpose an arm 364, Fig. 17, on the lever co-operates with a push rod 370 actuated by a lever 378, Fig. 2. On such turning of the pin, the sleeve 139 is permitted to turn clockwise due to the expansion of the spring 144 and the shoe is released. The expansion of the spring is limited by the engagement of a member 394, Fig. 19, adjustable on the rod 142, with washers abutting against a plate 400 engaging the frame of the machine. On the return of the parts to starting position, the pin 198 is carried above the lug 200 and is then turned by a spring 368, Fig. 17, to normal position. The two wiper carriers 416, Fig. 3, are supported on a slide 420 reciprocated by a roll 432 engaging a path cam on the cam-shaft. For closing the wipers, each of the carriers is connected by a link 436 to a rack bar 442 gearing with a sector 444 moving with a second sector 450 gearing with a rack 452 adjustably secured to a slide 454 reciprocated by a roll 456. For actuating the wipers the slides 420, 454 are thus moved in opposite directions by path cams on the cam shaft, reducing the end-thrust on this member. To adjust the wipers for size of shoe, the slides 454, 452 are relatively adjusted by a threaded shaft 460, Fig. 7, rotated by a pinion 462 connected by toothed and chain gearing with a crank handle 502. The hold down 6 has a stem guided to slide vertically and formed with rack teeth gearing with a pinion 506 on a shaft having spiral teeth 510, Fig. 14, meshing with corresponding teeth on a slide 512 actuated by a cam roll 520. A light spring 524 urges the slide in the direction to depress the hold-down. To vary the initial downward movement of the hold-down, wiping the upper smoothly against the last, the camoperated member 518 may be adjusted by a wedge 528 moved longitudinally by a screw 534. The initial position of the hold-down is varied by longitudinal movement of a screwed sleeve 544 causing axial movement of the spiral gear 510 and consequent rotation of this and the pinion 506. A spring-pressed detent holds the sleeve 544 in adjusted position. The tack drivers are supported by a link 564, Fig. 7, from a lever 568 pivoted by a link 570 to the frame and lifted by a cam 572. A pair of light springs 578 urge the lever downwardly, as do, also, a pair of strong springs 580, all the springs being threaded on bars pivoted to the lever. The bars of the springs 580 are slotted to allow the lever to descend although the bars may be locked from descending by a shaft 598 which may engage a recess in each bar or may be turned to position cut away parts of the shaft adjacent the bars. The shaft 598 is turned by a lever 610, Fig. 2, controlled by the bar 516, a lug 620, Fig. 14, thereon co-operating with a spring plunger 618 at the lower end of the lever. The spring backing this plunger is stronger than the spring 524, and the shaft 598 is biassed to unlocking position by a spring 602, which is lighter than the spring 524. If no shoe is under the hold-down, the lug 620 prevents the lever 610 moving to allow the spring 602 to turn the shaft 598 to unlocking position. If a shoe is in the machine and it is desired to prevent the stronger springs 580 operating, e.g. when tacks are to be only partially driven, the lever 610 is locked by a spring plunger 630, Fig. 15, a head 642 thereon being rotated to allow fingers 639 to enter recesses in the plunger guide. The stroke of the drivers is limited by leather washers 648 co-operating with a stop member 646 carried by the lever 568. The stop member may be adjusted by an eccentric 654 formed on a sleeve rotatable by a square 658. The tack supply mechanism is constructed substantially as described in Specification 28474/10, [Class 17 (i)], a vertical rack bar 676, Fig. 2, being reciprocated by a lever 680 normally connected by a detent 686, Fig. 12, to a lever 682 provided with teeth to engage rack teeth on a vertical slide 690, Fig. 7, reciprocated by a cam-actuated roll 694, a spring 700 providing yield in both directions. The lever 682 also reciprocates a piston 712 supplying oil to an elevated reservoir from which tubes lead to the various parts of the machine requiring lubrication. The detent 686, Fig. 12, may be withdrawn by an eccentric 722 rotatable by a knob 728 when tack supply is not required. When it is desired to prevent operation of the tack drivers, a hand lever 738, Fig. 7, is pushed rearwardly to bring a slide 742 under a step secured to the lever. The upper end of the lever co-operates with