Patent GB-802274-A (GB)
Title: Improvements in or relating to trimming machines for use in the manufacture of shoes
IPC: A43D23/06
Filed: 1955-11-07
Abstract: 802,274. Shoe upper trimming machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Nov. 6, 1956 [Nov. 7, 1955], No. 31715/55. Class 17(1) A machine, for trimming surplus upper margins from the toe of a shoe on a last, having a shearing bed, means to outspread the upper margins, tension them, and urge them towards the shearing bed, and trimming means, has additional features as follows: (1) Wiping means in the form of pivotally connected wiper plates with a wiping surface conforming to the periphery of the toe of a last, and a surface perpendicular to the wiping surface which forms the shearing bed; (2) Means so to position the shoe that the wiping surface engages the shoe above the last bottom; (3) Means to move the shoe heightwise to cause the upper to be wiped downwardly; (4) The spreading means comprises a spreader element and a yieldable cooperating pincer; (5) The trimming means comprises a rotary knife. The toe wiper 16 comprises a pair of pivoted interchangeable curved plates 30 secured to plates 36 which are closed when slide 40 is moved rearwardly by rotation of cam 56. When the reciprocating carriage 70 moves forwardly a cam 128 thereon raises rollers 122, pivoting levers 118 clockwise, Fig. 3, so that carrier 112 is pivoted clockwise about trunnions 114 and raises the toe lifting plate 26 to move the shoe heightwise into contact with the inner walls 34 of plates 30 to effect downwiping. Such movement is limited by engagement of lug 124 with adjustable stop 134. By turning wheel 160 wedges 148 are advanced and by engagement with wedge faces of stops 134 adjust the latter heightwise, a scale 154 indicating this adjustment. Knife 29 is adjustable heightwise by hand wheel 190 (not shown) normally locked by a spring plunger, and is rotated when carrier 70 moves by means of a rack 186 acting through gears 184, 182, 180, and shaft 174. Side spreaders 18, tip spreaders 22, tip presser 24, and toe stop 28 are all reciprocated by carriage 70, but are movable heightwise relatively thereto on carrier plate 210 which is pivoted to carriage 70, and has rollers 222 engaged in cam tracks 224, and is pivoted clockwise, Fig. 3, when the rollers engage .parts B of the tracks. In normal operation, tracks 224 are depressed slightly against spring 248 (not shown) on which they are supported via levers 232 and bell cranks 226, and the compressions of these springs are controlled by a cam 254 which is rotated by hand wheel 260 and locked by detent 264 and graduated notched wheel 262, and which adjusts shaft 252 (not shown) about its axis. Rotation of shafts 252 acts via levers 244 (not shown) to compress springs 248. The toe stop 28, mounted on a slide 316, is urged upwardly by spring plunger 330 via latch 324, and rearwardly by another spring plunger, and forward movement of the shoe by the operator is limited by engagement of slide 316 with an adjustable stop. Plates 280 carrying spreaders 22, 18 are slidable towards and away from each other in diagonal guides in plate 210, and are normally held forwardly and inwardly by spring 288. Spreaders 22 are mounted on a slide which is urged forwardly on plates 280 by springs 304 (not shown). After part of the forward movement of carriage 70 the forward movement of plates 280 is limited by engagement of roller 310 with an abutment and thereafter plates 280 move outwardly. When the part 379 of cam 378 permits movement of slide 370, bell cranks 360 are rotated by spring 372 via 382, 366, and move pincers 20, pivoted thereto, inwardly to grip the upper margins against spreaders 18, 22. The compression of spring 372 is varied by turning hand wheels 398, a gauge 400, 402 being provided. Depression of a treadle trips a one revolution clutch, but such operation is prevented, when cover plate 418 is raised, the latter causing the linkage between the treadle and the clutch to be latched. A further cover plate 432 is closed when the rear end of carrier 112 descends. In operation, a shoe is placed on toe lifting plate 26 and .engaged with toe stop 28 with the upper margins spread thereover, and urged forwardly by the operator. The clutch is then tripped, whereupon wiper plates 30 close and lifting plate 26 rises. Plate 210 then begins to rise, and finger 336 of latch 324 engages plate 292 causing toe stop 28 to be retracted. As the forward motion of carriage 70 continues, with plate 26 rising, wipers 30 wipe the upper downwardly. Meanwhile tip spreaders 22 spread the upper against bed 33. When the upward movement of plate 210 ceases, spreaders 22 iron out the upper margins, and then move forwardly with side spreaders 18. Pincers 20 then close and grip the upper. Springs 304 disengage tip spreaders 22 from side spreaders 18, and when the forward movement of plates 280 is halted, side spreaders 18 and pincers 20 move outwardly against springs 288 and 372. Knife 29 then passes below the shearing bed and severs the outwardly extending lining, but leaves the upper unless the knife is set for skiving. The parts return during the second half of the revolution of the clutch. Specification 686,649 is referred to.