Patent GB-928101-A (GB)
Title: Improvements in or relating to shoe upper conforming machine
IPC: A43D23/04
Filed: 1958-09-09
Abstract: 928,101. Shoe upper conforming machines. BRITISH UNITED SHOE MACHINERY CO. Ltd., and R. C. QUARMBY. Sept. 7, 1959 [Sept. 9, 1958], No. 28829/58. Class 17 (1). A toe lasting machine including a forepart support 2 which is raised by fluid pressure operated means to support a shoe with its bottom in engagement with a hold-down member 50, a heel end abutment 70 moved by fluid pressure operated means lengthwise of the shoe to engage the heel end of the upper, and a fluid pressure circuit for supplying both means, has the following additional features: (1) Operation of the heel end abutment is brought about automatically as the forepart support meets resistance during its operation. (2) The shoe is positioned lengthwise by engagement with a toe end positioning member 52 which is automatically moved to an inoperative position when the shoe has been supported in operative position. (3) Raising of the forepart support is effective to raise the heel end abutment from an inoperative position prior to its lengthwise movement. (4) The fluid pressure circuit is controlled by an operator actuated member (5) Fluid-operated means restrain heightwise movement of the shoe as a plurality of fasteners are driven to secure the lasted margin. The rubber toe support 2 is mounted on a post 4 slidable in a casting 6 pivoted on pins 24 so that the jack may be swung from the normal position shown to a forward position for loading. A piston 10 on the end of rod 4 slides in cylinder 8. The heel end support 30 with a last pin 32 is pivoted at 36 to a slide 42 slidable heightwise in casting 6 and urged upwardly by a spring. The heel rest 70, carried by casting 88 which is adjustable heightwise on post 92 by hand whee<SP>1</SP> 90, may rock about pin 72, and may swing widthwise on pivots 78, 82 during movement to engage the shoe, but at engagement teeth on members 76 and 88, which are normally spaced by spring plungers, are engaged to lock the heel against sideways displacement. As post 4 rises rolls 104 thereon rotate lever 98, against spring 101, which moves casting 88 and the heel rest from loading position, Fig. 1, to operative position, links 89 preventing undue movement transversely of the shoe. The heel rest is pulled toward the shoe by chains 120 linked to casting 88 and secured to sprocket 152 on shaft 154 which is rotated when wire 160, encased at 174, is pulled, against spring 162 by downward movement of piston 190 in cylinder 184. The heel supports are locked, just after commencement of a power cycle, by interconnected pawls 220, 228, which are controlled by cam 278 and engage respectively ratchet wheels 156 on shaft 154 and a toothed rack 244 on slide 42. Chains 120 are tensioned, between upwiping and overwiping operations, by means of cam 140 which swings lever 134, 138 carrying guide sprocket 130. This prevents heelward movement of the shoe while the wipers 60 make two overwiping movements, thereafter the cam acts to relieve the tension. The degree of tensioning is adjusted by means of stop-rod 139 and nut 143 which adjust the initial position of roll 137 relatively to cam 140. Valve 310 is normally closed, but between successive cycles and in the early part of each cycle the valve is opened by a cam lever (not shown) acting via 340, 342 &c., and at the latter times fluid from pipe 18 enters chamber 8 to raise piston 10 and the toe rest. Toe stop 52, which is pivoted to a carrier 456 and urged anticlockwise (Fig. 1) into operative position by a spring, is withdrawn bodily, after the positioning of the shoe but prior to the initiation of a cycle of operations, by means of a Bowden cable system operated by movement of piston 518 in cylinder 516, and including an adjustable lever for adjusting the initial position of the toe stop. The hydraulic circuit is shown in Fig. 8 with the parts in the initial, Fig. 1, position, the pump 360 passes oil through pipe 366 to the reservoir via filter F. On depression of treadle 388 valve 368 is closed, and oil, with the maximum pressure controlled by reducing valve RV, passes via pipe 18 to cylinder 8, and when the pressure has built up raises the toe pad 2 and heel rest 70. When pad 2 engages the shoe the pressure builds up further and passes via restriction R to cylinder 184, moving piston 190 downwardly and thus moving the heel rest into engagement with the shoe. After further buildup of pressure piston 518 is moved downwardly and withdraws the toe stop 52. Thereafter cam 278 causes the heel rest to be locked, the movement of lever 268 engaging pin 400 with shoulder 401 so as to ensure that valve 368 remains closed and the jack in operative position when the treadle is released. At the end of the cycle, which is started by normal operation of a starting lever, cam 278 releases pawls 220, 228 and the parts return to initial position. The machine may be used for cement lasting. Specifications 470,749, 482,275, 489,649 and 628,426 are referred to.