Patent GB-506270-A (GB)
Title: Improvements in or relating to the preparation of shoes for a conforming operation thereon
IPC: A43D11/00
Filed: 1937-11-24
Abstract: 506,270. Lasting shoes. BRITISH UNITED SHOE MACHINERY CO., Ltd., and ROBERTS, W. T. B. Nov. 24, 1937, Nos. 32301/37 and 24406/38. [Class 17 (i)] A machine for preparing a pulled-over shoe for end-lasting comprises a trimming knife of sufficient width to extend across the toe of a shoe and trim marginal material from the end and sides of the toe as it moves there-across. The upper margin is turned away from the shoe bottom before the advance of the knife. Preferably, this positioning mechanism first slits the upper margin on each side of the toe end and then turns it over a shearing member which co-operates with the knife. The support for the margin may have raised portions, which cause the knife to cut more deeply into the material at the parts which rest on the raised portions. A cam-shaft 5 is driven by a onerevolution clutch engaged by depression of a treadle. An eccentric 7 on the' cam shaft actuates a lever 17 linked to a slide 25 carrying a spindle 37 to which is secured a circular knife 31. The knife spindle is clamped to the slide, but the knife can be raised or lowered by a hand-nut 41 when a clamping screw is slackened and it can be adjusted on the spindle to present different parts of its edge to the work. The shoe is held against an adjustable sole plate 193 and an adjustable heel seat engaging member 203. The toe end abuts against an interchangeable metal block 53 formed with a shearing edge 55 co-operating with the knife and having a metal lining 57 the upper edge of which inclines upwardly to the edge 55 and is formed with a series of V-shaped ridges 61. The toe end of the insole is engaged by a pair of arms 63, pivoted at 65 to a member 69 slidable vertically in guides in a slide 71 actuated by a cam-lever 75. The slide 69 is urged downwardly by springs 87 carried by the slide 71, the springs being threaded over rods 93 which at the rearward end of travel of the slide 71 arrive below a block 141 carried by a cam actuated lever 133 to depress the arms. Each arm carries a knife 125 and is actuated by a link 113 and cam-actuated bell-crank lever 111. Adjacent to the edge of the knife 31 the slide 25 carries a number of upper-marginpressing fingers 159, each urged downwardly by a spring 169. The fingers are vertically positioned as a whole by rolls 181 engaging fixed tracks 179. These tracks cause the fingers to press hard on the upper margin during the latter part of their operative traverse. The block 53 may be heated, to prevent a thermoplastic toe stiffener being cooled by contact therewith. In a modification, the part 57, only is interchangeable, the portion outside it being adjusted by a right- and left-hand screw to grip it. The bell-crank lever 111 and its actuating lever may be duplicated, the levers being adjustably connected to enable the swing of the fingers 63 to be varied for different shoes without varying their initial position. In operation, a pulled-over and side-lasted shoe may have its toe-end pulling over tack removed, and the toe end may be placed in a heater to enable the usual stiffener to be softened. The shoe is then.threaded into position in the machine and held while the treadle is depressed. The fingers 63 move rearwardly to lay the upstanding margin of the upper at the toe end over the bevelled portion 59 of the lining 57. The fingers then open out, the knives 125 slashing the upper in the vicinity of the too cap line and the fingers bending the margin outward, the lever 133 finally pressing the fingers positively and firmly downwards on the out-turned upper margin. The knife and fingers 159, meanwhile, reach the upper, the fingers being depressed by the bend in the track 179 just before the knife commences to cut. The fingers 63 move still further rearwardly, and open out fully, to clear the knife and fingers 159, and the knife completes the cut. The parts of the machine then return to starting position, and the shoe may be removed, and lasted in the machine described in Specification 470,749. The first Provisional Specification describes a modified machine wherein the shoe positioning means at the rear of the sole are carried by a table supported by an adjustable parallel linkage. The spreading fingers are below the trimming knife, are opened by lateral arms, and carry no slashing knives. The inner face of the shearing block 53 may be of somewhat rectangular form to give clearance for the usual pulling-over ears.