Patent GB-316186-A (GB)
Title: Improvements in or relating to machines for conforming boot or shoe uppers to the shape of the sides of a last
IPC: A43D21/16
Filed: 1929-07-23
Abstract: 316,186. United Shoe Machinery Corporation, (Assignees of Lawson, R. H.). July 24, 1928, [Convention date]. Work-supports; machines using continuous wire.-In an upper-conforming machine of tht general type described in Specifications 215,772 and 241,285, [both in Class 17 (i), Boots and shoes, Apparatus for making &c.], two upper-conforming and stapling units shape the upper simultaneously and progressively at both sides of the shoe from the heel breast line to the tip line and permanently secure it to the insole rib by means of staples. The machine is controlled to operate through a predetermined number of cycles and then stop with the shoe presented to the operator for removal from the jack; the jack has work-feeding movements automaticallv controlled in accordance with the size of the shoe, and is given a rocking movement to keep the insole horizontal at each operation of the shaping units; the several parts of the staple forming and inserting mechanisms are so linked as to be operable bv a single operating member. The machine comprises a box base 50 and a head 52 carrying the shaping and stapling units 54, 56. A jack 58 is carried by an arm 60 pivoted to the base for horizontal and vertical swinging movement. The front end of the arm is supported by a bell-crank lever 64, Fig. 1, connected by a spring 74 to a bellcrank lever 76 linked to a lever 84, Fig. 2, having a roll 88 engaging a cam 90 on a cam-shaft 92 which is rotated once during the operation of the machine on each shoe. The cam 90 acts to hold the jack up to presser feet 100, 102 on units 54, 56 during the insertion of the staples, and to relieve the pressure while the work is fed. Each unit 54, 56, Fig. 2, is rotatably carried by a sleeve 116 pivoted for forward and rearward swinging movement on the head 52. The two sleeves 116 are geared to. gether to have equal but opposite swinging movements. Each unit comprises a pair of vertical plates 130 between which a stapling mechanism 134 and a pair of grippers 136 are carried. The stapling mechanism and the grippers are respectively operated by slide members 138, 140 rotatable within the units and connected by links 146, 148 to an operating member of the machine. A stapling mechanism comprises levers 160, 162 fulcrummed at 164 and a lever 166 fulcrummed at 168. The lever 160 is linked to the slide 138 and carries a driver 172 which slides in a throat 178 carried by the lever 162. An inside staple former 180 is carried by a pivoted arm 182 controlled by a rod 184 and spring 190. The lever 160 has rolls 198 engaging slots 192 in the lever 166, and the latter has rolls 202 engaging in slots 200 in the lever 162. Thus, movement of the lever 160 by the slide 138 produces the necessary movements of the levers 162, 166. The throat member 178 comprises a block 210 formed with the driver passage, and a cover plate 212 formed with a slot 216 for entry of the inside former. The lower portion 226 of the cover plates serves as a wiper. Wire for the staples is fed bv a curved tube to a passage 234 in the block 210, a staple length being sheared by movement of the block. Part of the driver passage is formed by the head 238 of a spring-pressed plunger 236 which is displaced when the inside former 180 moves into operative position. The throat blocks acts as the moving outside former. The presser feet 100, 102 engage the inside rib of the shoe, to position it, with a spring pressure so controlled from a cam on the shaft 92 as to be light at the shank and heavier at the wider portions of the shoe. The feet are locked against the'rib during the staple driving by a locking arrangement. The staple wires are fed from reels 512, 514, Fig. 2, to the guide tubes by feed rolls, which are geared together and operate step-by-step from a cam on the shaft 300 by a ratchet and pawl. The jack 58 is connected to the arm 60 by a gimbal joint, and a rod connecting the forward end of the arm 60 to the frame constrains the jack so to move that the longitudinal axis of the shoe has a parallel movement, with no turning about a vertical axis. The jack comprises arms 664, 666, Fig. 1, and a horizontal portion 670 from which extends a hollow spindle 672 housing a shaft 674, Fig. 8, having a gear on its upper end and connected at its lower end to a dish-shaped pulley 680. Around the latter passes a cable 690 of which one end is led to a winding pulley 694, Figs. 1 and 3, driven by the shaft 354, and the other end is led round a pulley 706 carrying a weight 708, round pulleys 718, 720 on a lever 722 forming part of a pantograph mechanism, and is finally anchored to a lever 726. When the machine is driven, the cable is wound on the pulley 694, rotating the shaft 674 and raising the weight 708. When the machine is declutched, the weight reversely rotates the shaft 674. A rack-bar 732, Fig. 8, slidable in the arm 664 of the jack carries pivotally a U-shaped member 734 of which the shorter arm 736 carries a last-pin 738 in which is a spring-raised plunger 740. A toe rest 746 pivoted to the arm 666 of the jack is connected by links 748, 750 to the member 734. A twopart spring-connected lever 758, 762 has a rack 764 meshing with the gear on the shaft 674, and is connected bv a toggle 756 to a pivoted lever 754. The latter is connected by a link 770 to rack levers 772, 782 which operate the rack bar 732. The latter, and so the last pin 738, is urged to the right by a spring 776 but is restrained by the straightened toggle 756. When a last is placed on the pin 738, the plunger 740 breaks the toggle 756 through the intermediary of links 786, 798. The last pin is now moved by the spring 776 until the toe of the last engages the toe rest 746. To move the jack step-by-step to feed the work, its arm 666 is linked to the lever 726, which is operated by a cam of the cam bank 642 of such form that the jack is moved one step after each upper-tensioning and stapling operation It may also be given a short movement after the first updraw and before the first staple is inserted at the heel breast line. The feeding steps of the jack are controlled in accordance with the size of the shoe placed upon it by pantograph mechanism similar to that described in Specification 215,772, [Class 17 (i), Boots and shoes, Apparatus for making &c.].