Patent GB-427750-A (GB)
Title: Improvements in or relating to shoe-upper conforming machines
IPC: A43D21/02
Filed: 1933-10-28
Abstract: 427,750. Boot - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., and BATES, A., Belgrave Road, Leicester. Oct. 28, 1933, No. 29949. [Class 17 (i)] Lasting and pulling-over.-A step-by-step lasting-machine has a toe rest which may be moved to inoperative position while the parts rearward of the toe end are being lasted, and moved to operative position to support the toe end particularly against the thrust of fastener insertion. The rest is yieldingly urged upwardly during the time the grippers are in action, to allow the shoe to be fed, but is locked against movement prior to the driving of the fastener in each cycle and, preferably, pressed more firmly against the shoe subsequent to the locking while the fastener is actually driven. The rest 27 is self-adjusting about a ball end on a shank 21 clamped in a member 19 pivoted at 17 and provided with a ratchet segment 31. A cam 33 moves with the member 19 and co-operates with a roll on a lever 37 urged counter-clockwise by a spring 41. The cam and lever urge the rest toward the shoe when the rest is in operative position, and also retain it in inoperative position when it has been pushed downward, the roll then engaging a recess 45 in the cam. An arm 51, also pivoted at 17, is slotted to engage a shaft 61 on which is a cam 57 secured to an arm 59 connected by a link 75 with a bell-crank lever resiliently connected with the usual slide 7 carrying the tacking instrumentalities. The arm 51 carries a pivot shaft 63 on an eccentric portion of which a pawl 53 co-operating with the ratchet is pivoted. An arm 65 secured to the pivot 63 co-operates with a roll 69 on the arm 59. The pawl has a small tongue 93 projecting into a slot in a head on the eccentric portion of the shaft 63. In operation, when the tip line of the shoe is reached, the operator brings the rest up to the shoe, a leaf spring 44, co-operating with an adjustable stop 47, determining the normal position of the rest. At this time, the pawl 53 is held out of action by the tongue 93, so that the rest is resiliently supported by the spring 41. As the slide 7 advances, to position the tack block 5 and driver 3, the link 75 removes the roll 69 from the arm 65 and releases the pawl to the pull of its spring 73 so that the pawl engages the ratchet. Further, the arm 65, by rotating the eccentric pivot of the pawl, causes this to move forwardly to take up any lost motion and engage a tooth. Just prior to the actual driving of the tack, the cam 57 gives a further thrust to the pawl, to press the shoe firmly against the tack block. The rest 27 is in line with the driver 3. On retraction of the slide, the cam 57 eases the thrust of the rest so that the pawl can be readily withdrawn by its tongue 93, to allow the shoe to be fed. According to the Provisional Specification, the rest is pivoted to its shank which can swing about its axis, between limits, so that the rest is self-adjusting. The member carrying the rest is yieldingly retained in either the operative or inoperative position by a compression spring, and is locked for the fastener insertion by a brake shoe co-operating with an arcuate braking surface, the braking pressure being increased as the tack block reaches its operative position. Specification 14453/97, [Class 17], is referred to.