Patent GB-992964-A (GB)
Title: Improvements in or relating to machines adapted for use in the manufacture of shoes
IPC: A43D23/02
Filed: 1961-09-06
Abstract: 992,964. Work supports. BRITISH UNITED SHOE MACHINERY CO. Ltd. Sept. 6, 1961 [Sept. 8, 1960; Dec. 21, 1960], No. 31941/61. Heading A3B. In a heel attaching machine a work support for a last 34 which carries a positioning plate 54 at the crown face of the heel portion comprises an abutment face engaged by the positioning plate, a peg arranged to be received in a socket opening 36 in the crown face of the last and preferably possesses the following:- 1 a yieldable latch which co-operates with the positioning plate; 2 two members between which are clamped two faces of the positioning plate which are disposed at either side of and at an equal distance from a reference plane of the last; 3 means arranged to engage the positioning plate rearwardly and toe wardly of the socket; 4 a retractable peg. Two work supports 20, 21<SP>1</SP> are described. Both supports are mounted pivotally at their upper ends on a slide 112 which moves in a guideway 114. Means comprising a rotary disc 148, multi-length abutments 150 and stop screw 152 allow the support to be positioned in guideway 114 for any size of last. Handle 130 and associated members clamp the slide in guideway 114. The supports are held in their loading and unloading positions by spring pressed plungers 138, 138<SP>1</SP> (not shown) engaging in notches 140, 140<SP>1</SP> (not shown) formed in bosses 110. Support 20 comprises a post 104 upon which is mounted the last holding mechanism. The mechanism comprises a latch 164, a fixed abutment 174 and levers 180, 190 which in their initial positions are pivoted away from engagement with positioning plate 54 when it is presented to the holder. The latch 164 and abutment 174, however, co-operate with lip 66 and face 64 of plate 54 respectively. With peg 22 in socket 36 the support is swung towards the heel attaching position whence a cam 256 triggers a switch and solenoid valve 234 so that pressure fluid enters cylinders 198, 210. Piston rod 204 of cylinder 198 moves, against its spring loading, to engage an end of lever 180 the other end of which is then urged against a second face 64 of the positioning plate 54. Piston rod 214 of cylinder 210 engages a lever, 218, a roll 218 of which co-operates with end 190b of lever 190 so that end 190a clamps against plate 54. The process is reversed on the support being swung away from the heel attaching position. Support 20<SP>1</SP> comprises a post 404 in which a cylinder 478 is floatably mounted on a bracket 476. Peg 52 is pivotally attached to a bar 472 which in turn is connected to a piston rod 474, a roll 482 of bar 472 moving in bracket 476. Opposite ends of the cylinder mounting carry studs 490, 492 which may move in slots 494, 496 in post 404. Bracket 476 also has a rod 506 pivotally connected to it which, when it is in its initial position, i.e. in engagement with member 462, acts against spring 510 to pivot a lever 462 (not shown) away from engagement with a last 34. A last presented to the work support is engaged by a latch 453 and abutment 458. On applying fluid pressure to cylinder 478 by triggering valve 234, piston 474 and associated members are lowered until a stop 514 co-operates with a notch 515 in bar 472. This lowers peg 52 into its socket which is so shaped that end 52c of the peg engages with the lower end 37 of socket 36. When bar 472 is in engagement with a stop 514 the cylinder 478, since it is floatably mounted, rises thus moving bar 472 and peg 52 to the left as seen in Fig. 9 due to the studs rising in angled slots 494, 496 thus rotating the last slightly anticlockwise so as to clamp abutment face 456 of the support against the upper face of positioning plate 54. The rising of cylinder 478 also disengages rod 506 from member 462 thus allowing lever 462 (not shown) to clamp against a face of plate 54. A modification is described wherein a switch is placed on post 404, its closure being effected by the upward movement of a plunger which initially projects below and through abutment face 456. The heel attaching station comprises a heel form 70 mounted for reciprocation on a rod 80 above a nailing disc 50. Specification 863,464, U.S.A. Specifications 1,365,802, 1,157,688 and 1,948,547 are referred to.