Patent GB-328550-A (GB)
Title: Improvements in methods of and apparatus for levelling or moulding the soles of shoes
IPC: A43D89/00
Filed: 1928-12-28
Abstract: 328,550. British United Shoe Machinery Co., Ltd., Bates, A., and Keall, F. B. Dec. 28, 1928. Sole-levelling.-Relates to machines of the kind in which between a levelling tool and a shoe support there is relative rolling movement to cause levelling pressure to be applied progressively to a shoe bottom to be levelled, and consists in the provision of power driven means for holding a shoe on a last on the support, a device for applying non-progressive shaping pressure to the waist, and power driven mechanism to cause the device to, press on the shoe bottom. The invention is described as applied to a " Goodyear " automatic levelling machine examples of which are described in Specifications 103,849, 104,728, 236,270 and 274,920. The usual jack handle 25 co-operates with a modified locking member 23 curved at its lower end to slide in a curved guide 27 formed in a bracket 21 secured to the jack. The lower end of the member 23 carries a pin 31 and the upper end is formed with a guide slot 24. On the pin 31 is pivoted a lever 33 restrained at one end by a link 35 and pivoted at the other end to a rod 37 passing through a sleeve 39 pivoted to a lever 43 pivoted to the trance at 45 and provided with a toe 49 normally engaging the frame. The rod carries a collar 55 above the sleeve 39 and an adjustable abutment 51 for a spring 53 below the sleeve, leather washers 57 being arranged above the sleeve. A latch 61 is pivoted to the sleeve 39 and co-operates with a roll 63 carried by the bracket 21. The handle 25 may carry a workholding strap, as described in the prior Specifications, but, preferably, links 113 at each side carry a waist-levelling member comprising a U- piece 121 loosely carrying a plate 125 to which is secured a rubber block 127 faced with leather. The front and rear edges of the plate 125 are slotted to provide resilient fingers about <5>/8 in. wide, and the work-engaging surface of the pad is shaped laterally to conform to a waist of maximum curvature, and longitudinally to conform to a waist of minimum curvature. In operation, the work is placed on the jack, and the handle 25 is depressed sufficiently to hold it in position, springs 119 depressing the link 113 as allowed by slots 115 in the ends of the links. The handle 25 is raised by the operator to tip the jack into the forward operating position and the machine is started as usual. As the jack is further tipped by the power drive, to cause the work to traverse under the levelling roll 10, the segment 23 is held so that the waist pad is forced down on to the work, the pin 31 and rod 37 being urged downwardly by the spring 53. Meanwhile, the roll. 63 rises and engages the latch 61, to prevent release of the pressure on return of the jack. At the conclusion of levelling, on the usual automatic return of the jack to starting position, a. stop 71 disengages the latch 61. To support the instep of the last, a cradle 95 lined with felt may replace. or supplement, the usual toe-rest. The cradle is supported by curved members 93 carried by a slide 91, on a post adjustable vertically by a wedge. The cradle may be automatically adjusted for size of shoe by connections from the heel post 16, a link 109 being adjustably connected to a lever 107 pivoted to the carrier 91 and having its other end restrained by a link. The forward edge of the waist pad and plate 125 are bevelled off, so as to permit the roll 10 to ride on to the edge. Specification 264,461 also is referred to.