Patent GB-746823-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/16
Filed: 1952-05-10
Abstract: 746,823. Upper conforming machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., (United Shoe Machinery Corporation). May 11, 1953 [May 10, 1952], No. 11872/52. Addition to 608,176. Class 17 (1). The machines claimed in Claims 1, 3, 4 and 9 of the parent Specification are modified in the following respects. The outward movement of the grippers to the gripping position is limited according to the width of the shoe, and when the upper has been gripped, the grippers are moved further outwardly prior to any substantial pulling action, thus ensuring the detachment of any prematurely adhered portions of the upper. The grippers may be moved automatically and simultaneously in opposite directions lengthwise of the shoe for operating in alternate cycles on left and right shoes. The hold-down is urged against the shoe bottom by fluid, the pressure of which is adjustable so as to apply the required pull on the upper. The grippers may be moved to pull the upper heelwards in time relation to the heightwise pulling. A pair of wiper devices extend continuously one beyond the other at each side of the shoe, the one being movable relatively to the other to suit the length of shoe to be wiped, and such movement being determined by means engaged by the shoe when it is presented. The wiper device of each pair which has moved the toe is movable relatively to the other to vary the length of wiping, and is moved, during inward wiping, in a heelward direction relatively to the other. The shoe is positioned by a shoe rest member 10 vertically adjustable on the pivoted lever 2 and initially held against upward movement by a toggle 36 straightened by spring 46, and a shoe rest member 54 which engages the toe end face of the shoe, is connected to a spring pressed slide 62, and pressed against roll 80 by spring 78, the roll being mounted on links 84 which are permitted limited vertical movement by pin and slot 92, 94 and held by spring 98. Screw 100 limits the swing of lever 88 and determines the heightwise position of member 54. The shoe is positioned widthwise by side clamps 102 on pivoted levers 104 which have inteiengaging sectors 108, are moved by pistons 110 operated by fluid from 118 returned by an adjustable spring 132 and held by springs 130, and each carry shoe-engaging strips 126 connected by spring 128. The shoe is then clamped against members 10, 54 by an adjustable toe rest 142 which is actuated by piston 150 and returned by spring 154 (not shown). The grippers 166 include a fixed jaw 168 and a jaw 174 closed by piston 178, when fluid enters at 184, against spring 186. The jaws are moved upwardly with casting 170 by fluid through 224 acting on piston 200 and by a purchase on the shoe bottom through 202, 204, and the hold-down 208. Casting 170 is guided between arms 226 and returned by spring 242 which tends to swing the casting inwardly about 214. Links 232 assist in controlling the hold-down with respect to widthwise movements. The height of the hold-down bar 210 and casting 170 relative to casting 228 is varied by adjusting the supporting spring 250 by means of screw 256. Casting 228 swings about 266 to move the grippers and hold-down lengthwise of the shoe, and is adjustable lengthwise of the shoe on arm 264, which is adjustable vertically through 286, 288, 292, by twisting rod 306. After the pulling operation the grippers and hold-down are raised by spring 316 which is compressed by piston 312, fluid passing through 314 to the piston at the same time as it passes to actuate pistons 200. Spring 316 has no substantial effect while the gripper holds the upper. Turning movement of rod 278 is imported to arm 264 through 330, 328, 326, 324. Contact of webs 338 and screw 336 on arm 332 by spring 340 on shaft 278 adjustably limits the inward swinging of arm 264. Arms 332 are moved by pistons 344 of cylinders 342 pivoted at 348 to levers 104, and arms 350 pivoted at 348 have screws 356 to limit swing- ing of arms 332, thus relating movement of the grippers and hold-downs to the clamps on levers 104. Fluid for cylinder 342 passes through 358 from the line to cylinder 112, so that the outward movement of grippers and hold-downs is simultaneous with the inward movement of clamps 102. As fluid actuates pistons 200, pistons 364 are also actuated through 368 so that stems 366 move arms 350 and stop screw 356, permitting pistons 344 to swing arms 332 further, moving the hold-downs and grippers further outwardly. Flow to cylinder 198 is retarded at 372 so that this outward movement takes place before substantial upward movement. Springs 352 return arms 332 and pistons 364. The hold-downs and grippers are adjustable lengthwise and angularly of the median line by means of rods 374, ball jointed to bars 210 and moved by swinging movements of lever 380 through 378, 388, and spring 386. Lever 380 is swung automatically for operating on right and left shoes alternately by means of a lever 390 adjustably fulcrumed at 394 and rocked by link 402 eccentrically mounted on gear 406 driven by gear 412, the latter being rotated by a latch 428 (not shown) on a piston in cylinder 420 which is moved forward by fluid to engage one of four pins 418 on a disc 416 on the gear-shaft, and rearward by spring 432 to move the pin and gear 412, gear 406 rotating through 180 degrees. The disc 416 is accurately positioned and held after each cycle by a spring detent. The extent of the resultant movement of the grippers is dependent on the adjustment of fulcrum 394. This automatic shifting of the grippers may be dispensed with by actuation of shut-off valve 438 which prevents fluid passing to cylinder 420. The grippers may be shifted normally if desired by hand operation of a rod 440 having a latch 442 which engages and moves a pin 418. When the disc 416 is rotated by either latch the pins 418 idly pass the other latch. The grippers may be moved toward the heel end simultaneously with their outward movement by means of the piston of cylinder 454 through lever 460, pins 464, and blocks 466 connected to rods 374. Cylinder 454 is supplied with fluid and through 476 connected to the supply to 198 and 362. This movement is limited by screw 474 which may be adjusted so as to prevent the movement altogether. The fluid supply line to cylinder 198 includes a member containing a ball shutoff valve and a piston held by a bell-crank pulled by a spring. The tension of the spring is adjusted by a hand wheel so that when the fluid for pulling the grippers is at the desired pressure it moves the piston, allowing the shutoff valve to operate and cut off the supply of fluid to 198. A pointer and scale indicate the condition of the spring holding the piston. Wipers 532 pivoted at 534 on arms 536, 538 which swing about 540, and having rolls 550 lying in slots 548 in plates 546 attached to levers 542, are swung by movement of levers 542. In the first part of this movement levers 542 through links 578, plates 566 pivoted at 568, links 562 pivoted at 564 to 542 and having slots 560 engaged by studs 558 on arms 538, and rollers 576 engaged in portions 572 of slots in 566, swing arms 538 inwardly moving wipers 532 bodily inwardly with some movement toward the toe end, but when roll 576 engages portion 574 of the slot and plate 566 continues to swing, arm 538 is not moved, link 562 moves relatively to pin 558, and the wipers 532 are swung inwardly about 534. Retractive movement of arm 538 is prevented by the crosswise relation of slots 560 and 574. Additional wipers 590 in recesses in the lower faces of wipers 532 are pivoted at 592 and connected to links 594 having slots 596 engaged by rolls 598 on cross-bar 600 adjustable along the shoe rest 54, spring 604 pulling the roll to the end of the slot. Thus, when rest 54 is moved by the shoe wipers 590 are moved accordingly to determine the length of shoe to be wiped. The distance from the end of the shoe at which wiping terminates, when stud 598 comes to the end of the slot, is adjusted by means of the securing screw 602 and a slot 606 in the cross-bar 600. When movement of wipers 590 towards the toe end ceases, the links move wipers 590 heelwards relatively to wipers 532. Auxiliary wipers 607, for the part sloping downwardly heelwards of the ball line, are pivoted at 612 to swing substantially lengthwise of the shoe, being swung toward the toe by spring-pressed pins 614 on arms 538, and include plates 608 and resiliently flexible curved plates 618. Levers 542 have interengaging gear sectors 622, are operated by pistons 624, and returned by springs 632. Stop blocks 636 for the pistons are adjustable by hand wheel. When the wipers have nearly completed their operative movements, toggle 36 is broken through arms 644, 648 on shaft 646 on the adjustable stop block 636, by roll 630 moved by piston 624. This releases lever 2 which permits upward movement of rest member 10, and through 84, 88, 100 permits member 54 to move upwardly to a less extent than member 10 due to the adjustable stop 640, allowing the shoe to be forced more firmly against the wipers by toe rest 142, particularly near the beginning of the shank portion. The fluid circuit is illustrated in Fig. 17, and includes a relief valve to determine the pressure and an outlet valve 662 operative when the machine is idling and actuated through linkages by a solenoid 678 (not shown). Valves a, b, c, d, e are similar in construction and operation to valve 662 and each solenoid has a separate switch, as 682 (not shown), operated by a pin 684 under control of an associated arm 688 on drum 692 rotatable on stationary shaft 694. The clutch comprises a ratchet 702 rotated continuously on shaft 694, and pawl 706 on the drum spring urged into contact with the ratchet but initially disconnected by contact with pin 718 on ring 720. To actuate the clutch ring 720 is moved to the left from the Fig. 14 position by piston 728 in cylinder 730 through 736, 740, 742, 724. After tripping