Patent GB-191012329-A (GB)
Title: Improvements in or relating to Work Supports for use in the Manufacture of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
IPC: A43D69/00
Filed: 1910-05-19
Granted: 1911-05-18
Abstract: 12,329. Boult, A. J., [United Shoe Machinery Co.]. May 19. Work-supports.-A work-supporting mechanism, particularly for use with high-speed fastener-inserting machines, is described as applied to the slugging-machine described in Specification 20,322/08. The work-support is raised from its work-receiving position to its workclamping position by a cam formed on the back of a disk 194 on a cross-shaft 114, which is geared to the main shaft 14. This cam acts through a lever 262, a spring-pressed rod 264, a lever 224 in the base of the machine, a link 226 connected to a slide 440 adapted to move in a carrier 442, and a toggle 462, 470 connected to a support 460, on which rests the horn shaft 452. The toggle 462, 470 is broken twice during each revolution of the main shaft, by a link 472 connected to a bell-crank 476, which is actuated through connexions 222, 221 with a cam-groove 218 in the driving-pulley 16. When the toggle is broken to the right, Fig. 1, the horn is moved into the work-releasing position to permit the work to be fed, during which operation the slide 440 is locked to the carrier 442 by two sets of clamping-plates 480, 484, Fig. 5, carried respectively by the slide and carrier, and arranged to alternate with each other. These plates are forced into engagement with each other by a spring-pressed sliding bolt 492 adjustably connected to a lever 498 mounted on an eccentric 500, which is adapted to be turned into a position to enable a roll 506 carried by the lever 498 to be acted upon by a cam-face 508 on a third arm 510 of the bell-crank 476. The eccentric is turned into this position bv connexions 514, 516, Fig. 1, with a rod 264, when the horn is moved into work-clamping position. When the toggle is broken to the left, Figs. 1 and 5, the cam 508 releases the bolt 492, and the clamping-plates are unlocked so as to permit the slide 440 to move to adjust the position of the horn to the thickness of the work. In the straightened position of the toggle, the plates are always in engagement with each other. In a modified arrangement, the release of the slide 440 to allow the horn to adjust itself to the thickness of the work is effected by a separate control from a cam on the cross-shaft 114. The invention also includes improvements in the horn itself. The horn H, Figs. 1 and 7, is provided with forked extensions H<1>, which embrace the upper end of a casing 442*; the ends of the extensions are curved and rest in curved seats in the sides of the casing. An adjusting-screw 446, passing through a cross-bar H<2> and a bushing 446*, connects the horn to a projection 444 on the casing; by loosening the screw 446 and turning the bushing 446*, the horn may be adjusted laterally. Relative vertical adjustment between the horn and its shaft 452 is provided for by a rack and pinion 448, 450, Fig. 1, actuated by a handle 456. Angular adjustment is effected at the lower end of the horn shaft 452, which is slotted to receive ears 466, Fig. 5, on a collar 468 adapted to be clamped in different positions on a stud 464 projecting from the horn support 460. The top of the horn may also be arranged automatically to adapt itself to the inside of the work being operated upon. The horn top consists of a disk 530, Fig. 4, resting on a wedge 532 having a cylindrical extension 534, which is clamped in the upper end of the horn; the wedge is reversible, and is positioned by pins 536. The horn top is yieldingly held in position by a spring rod 542, which passes through a comparatively large hole in the wedge and its extension into a bore in the horn, where its lower end is confined in an eccentric opening in a block 544; by turning the block, the rod 542 is made to press the horn top towards different sides of the hole in the wedge 532.