Patent GB-408953-A (GB)
Title: Improvements in or relating to shoe bottom pressing machines
IPC: A43D25/06
Filed: 1932-09-13
Abstract: 408,953. Boot-making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., Belgrave Road, Leicester.-(United Shoe Machinery Corporation ; 140, Federal Street, Boston, U.S.A.) Sept. 13, 1932, No. 25416. [Class 17 (i).] Sole-laying.-A machine of the rotary-turret type has the shoe-pressing pads positioned with their longer axes in the direction of rotation and their pressing faces upward. Power means rotate the turret, and work engaging members are moved from an inoperative position, spaced away from the pads, radially outwards of the turret into position over the pads, fluid pressure operated means moving the members downwardly to press the shoes against the pads. Sole and shoe locating means are provided for each pad actuated only when the turret is stationary. Sole pressing pad supports have opposite end portions hinged together so that the angular relation of the fore and rear parts can be adjusted. The pads rest on other pads. Means are provided for preventing the machine being started after work changing until a predetermined time has elapsed from the conclusion of the previous part rotation, and until a predetermined pressure has been reached between a pad and the shoe last positioned. The turret carries eight brackets 60, Fig. 3, each supporting a sole pressing pad, and a spider having eight rolls 70 by which the turret is rotated. The rods are engaged in turn by a cam track 72, Fig. 4, on a shaft 74 driven through a clutch from a continuously running gear 104, the cam track having its central part of greater pitch than the remainder so that each time the clutch is tripped the speed of rotation of the turret rises to a maximum and then decreases to the next stop. The clutch is of a usual type, engaged when an arm 116, Fig. 5, is lifted. This arm is pivoted at 118 on the same shaft as a lever 120 connected by a rod 122 to a starting lever. The free end of the lever 120 co-operates with a latch 126 pivoted to the arm 116 and provided with an extension 136 co-operating with plungers which prevent the clutch being engaged prematurely. A band brake 180 engages a disc on a shaft 94, Fig. 4, geared to the shaft 74. A link 140, Fig. 5, is pivoted to the arm 116 and to a lever 150, Fig. 4, connected by a link 156 to a pivoted arm 160 reciprocated by an eccentric on the shaft 94. The arm 160 carries a latch plate co-operating with the end of a lever 172 which is raised to tighten the brake band. Raising of the arm 116 releases the lever 172, and therefore the brake, simultaneously with the engagement of the clutch. The clutch is kept in engagement by a cam 206, Fig. 5, geared to the shaft 74 and engaging a roll on an extension of the arm 116. Shortly before the completion of two rotations of the shaft 74 the cam 206 allows the arm 116 to fall, allowing the arm 160 to engage the end of the lever 172 and the eccentric to raise the lever and tighten the brake band. Should the machine over-run, a cam 208, engages the end of the pivoted latch 126 and prevents starting of the machine, to indicate that the tension of the band should be adjusted. To ensure that one rotation of the turret shall take sufficient time for the adhesive to set mechanism is provided preventing clutch actuation within a predetermined time from the previous actuation. A pinion 220 meshing with the gear 104 is geared to a cam 226 rotating once per second. The cam oscillates a lever 230 carrying a pawl 234 engaging a ratchet wheel 240 urged clockwise by a chain and weight. A pin 250 on the ratchet wheel engages a face on a bell-crank lever, 254, 258 linked to a rod 260 urged to the right by a spring 264 but provided with a latch 268 for holding it to the left spaced from the extension 136. The arm 254 carries a pin cooperating with a ratchet retaining pawl 276. The ratchet wheel carries a finger 280 having a pin engaging any one of a series of holes around the wheel. When the machine starts after tripping of the clutch a pin 274 moving with the cam 206 releases the latch 268 allowing the rod 260 to engage the projection 136 and the pawl 276 to engage the ratchet wheel. Successive traverses of the pawl 234 rotate the ratchet wheel counter-clockwise until the arm 280 engages the lever 254 to retract the rod 260 and release the pawl 276. The clutch cannot be re-engaged before this retraction has occurred. The mechanism for pressing the shoe in each press towards the pad comprises two connected uprights 304, 306, Fig. 12, pivoted at 312, Fig. 11, and carrying a pair of levers 314, 316 pivoted at 318. The outer ends of the levers are loosely connected to arms on rods 320 guided to move parallel to the rods 304, 306 and urged upwardly by springs, stops 330 limiting this movement. The swing of the uprights about their pivot 312 is limited by rods 340 sliding through blocks pivoted to the cylinder 348 of a fluid pressure piston actuating the levers. The cylinder has a piston 356 urged downwardly by springs 366. The free ends of the levers 314, 316 co-operate with an equalizing lever 374, Fig. 31, bored to loosely engage a pin 372 supported by the piston. A spring plunger 376 normally maintains the lever raised so that a segmental wedge 384 on the piston is clear of a corresponding groove on the lever. On the piston rising slight opposition tilts the lever until the spring yields to allow the wedge and groove to bind, when further rise gives equal further lifts to the ends of the levers 314, 316. The last cone engaging member is slidable longitudinally of the pad, a spring pressed friction plug 396, Fig. 11, holding it in adjusted position. The toe rest is adjustable both transversely and longitudinally of the pad by mutually perpendicular T-shaped heads. A handle 420 is connected to a lever 408 to adjust the pad longitudinally and to swing the uprights 304, 306 to operative position. A gear pump draws oil from a reservoir 454, Fig. 3, and, when a piston is to be raised, forces the oil by a pipe 470, to the top of the turret and thence to valve casings 500, one for each cylinder. Exhaust returns to the column 52 and by a pipe 516 to the reservoir. Each valve casing has a pressure pipe 498, Fig. 10, an exhaust pipe 504 and a pipe 502 leading to the cylinder. The valves are of ordinary type having stems 542 actuated to open the valves by a cross-piece 544 on a rock shaft 546 actuated by an arm 562, Fig. 23, linked to a lever 566 having a roll 574 co-operating with a member 576 actuated by a treadle rod 578. A lever 594 pivoted to the member 576 is slotted at its other end to receive a screw threaded into a member 608 pivoted with the lever 594 and carrying a roll 610 engaging a third arm on the level 566. The valves in the casings 500 are actuated by a treadle 583, Fig. 27. When this treadle is depressed the arm 572 of the press at the operator's position is lifted to move the handle 562 to inlet position. Simultaneously a lever 612 is operated by a cam slot 626 in the lever 594 to lift the roll 574 of the press next to the left, opening the cylinder of this press to exhaust. The treadle also actuates a lever closing a valve in a pipe normally allowing the oil to be merely circulated by the pump, thus forcing oil through the open valve of the pad whereon new work has been positioned. Each press pad is provided with shoe and sole positioning means. The fore part mechanism comprises a U-shaped frame 652, Fig. 12, carrying feelers 654,655, Fig. 13, for the sole at the ball line and feelers 672, 673 for the neighbourhood of the tip line. The feeler 654 is carried on an arm 656 pivoted on an horizontal pivot 658 to a member 660 pivoted on a substantially upright pin 662, and the feeler 655 is similarly mounted. Each feeler is urged inwardly by a spring 664. The tip line feelers are crossed relatively to the others, so that the feeler 672 for the inside of the shoe pivots about the pin 663 corresponding to the outside ball feeler. These feelers are urged inwardly by springs 684. The members pivoted on the pins 662, 663 have rolls co-operating with lugs 690, Fig. 12, on a rock-shaft 694 actuated by a rod 708, Fig. 13. For locking the feelers after they have found the solo each of the four members pivoted on the upright pins 662, 663 has a thin plate 714 .. 717, Fig. 14, slotted to clear a pin 720 and arranged in overlapping relation beneath a washer and lock-nuts on the pin. The pin is notched to engage a projection on a lever fulcrummed at 728 and urged down wardly to clamp the plates together by a spring 736, a cam on the shaft 694 lifting the lever to free the feelers. Each sole feeler carries a shoe positioning gauge 740, Fig. 15, slidable to and from the shoe relatively to the sole feeler and clamped in adjusted position by a handle 750 on a conical member spring pressed into a conical recess. The rod 708 is actuated to clamp or withdraw the feelers by a lever 768, Fig. 26, having a roll 772 co-operating with a ledge on a lever 776 which is depressed by a treadle rod 778 and treadle 794 to swing the feelers to operative position. The treadle is held depressed by a latch on a rock shaft, a handle 826 being provided to release the latch if it is desired to reposition the sole. A roll 832 contacts with an incline on the lever 776 and then depresses a tail on the rock shaft to trip the latch as the turret commences to rotate, to allow the treadle to rise. To prevent the treadle 583 being depressed far enough to apply pressure to a shoe at the operating station until the fore part feelers have been brought into position by the treadle 794, but to allow partial depression to release the shoe on the press next to reach the station, for example when all the shoes are being removed from the machine, the frame of the treadle 794 carries a lug 838, Fig. 20, with a step underlying a lug 844 on the treadle 583. The step is swung out of the way when the treadle 794 is depressed. To allow the treadle 583 to rise completely when the turret commences