Patent GB-719096-A (GB)
Title: Improvements in or relating to machines used in the manufacture of shoes
IPC: A43D21/00
Filed: 1952-02-12
Abstract: 719,096. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Feb. 11, 1953 [Feb. 12, 1952], No. 3633/52. Class 17(1) A machine having toe, heel, and side lasting mechanisms has a holddown for a. shoe bottom member mounted on a last within the upper mounted for movement from an inoperative position away from over the shoe to a position over the shoe, means by which the operator causes such movement, and spring means which, on arrival of the holddown at the latter position, operates to move the holddown downwards into firm engagement with the shoe bottom member. The operating means may be operated by the arm of the operator while his hands are holding the shoe bottom member in position. The wipers and the holddown are interconnected so that when the wipers wipe inwardly the holddown is raised and moved away, and the means for moving the holddown downwardly are restored. In many respects the machine is similar to that described, in Specification 355,817. The last and shoe are supported by a vertically movable slide and a downwardly moving toe rest, the heel lasting mechanism moving with the slide downwardly and upwardly relatively to the toe and side lasting mechanisms. The side lasting mechanism includes flexible straps to be pressed against the sides of the shoe, fingers to clamp the upper margins against the strap 3, and fingers to lay the margins of the upper over the insole. The operator causes the toe and heel lasters to clamp the upper, and places a loose insole within the upper margins. The toe presser foot 24 is positioned by a handle and causes the machine to start, and the power operated heel and toe presser feet move the slide downwards. The holddown 34 holds the insole in position, so that this operation is not done by hand as previously, with possible injury from the toe presser foot 24 and clamping fingers. The holddown 34 is pivoted on stud 38 on a rod 40 and held in position by a spring 42, rod 40 being adjustable on a bar 48 widthwise of the shoe by nuts 52 and lengthwise of the bar by a slot and screw 50. Bar 48, supported from a bracket 54 on a slide 56 which is adjustable lengthwise of the shoe and supports the toe laster 8, moves within a guideway 58, 60, and is also guided by a stud 64 on the bar movable in a slot 62 in part 58, and on L-shaped slot 66 in which lies a roll 68 carried by the bar. A spring 70 tends to hold the bar in its inoperative position, i.e. as in Fg. 5. To apply the holddown, arm 48 is swung about the pivot 64 until roll 68 reaches the junction of the two arms of slot 66, whereupon spring 70 moves the bar and holddown downwardly to the operative position, as in Fig. 2. Bar 48 is swung by depression of a pad 82 carried by an arm 80 fast on a shaft 78, the other end of the shaft having an arm 84 connected by a link 86 to an arm 88 fast on a rock shaft 90, and a bent arm 92 fast on shaft 90 engaging bar 48. When the shoe is moved downwardly by the presser feet the holddown is similarly moved by spring 70. The holddown 34 engages the insole between the extremities of wipers 94, and is therefore moved before any substantial inward movement of the wipers, as follows. Wipers 94 are operated by rack bars 96 each engaged by a gear sector 98 fast on rock shaft 100. Sector 98 operates a pivoted gear sector 102 having an arm 106 pivoted to a member 108 having a bore through which a rod 110 extends. Rod 110 is connected bv a ball joint to stud 64. A head 112 on rod 110 is initially spaced some distance from member 108, as in Fig. 5. When the shoe and holddown move downwards rod 110 is moved until head 112 nearly engages member 108. When the wipers are operated arm 106 swings upwardly so that member 108 raises rod 110 retracting bar 48 and the holddown upwardly until roll 68 arrives at the junction in slot 66. Spring 70 then swings the bar and holddown to the inoperative positon.