Patent GB-980176-A (GB)
Title: Improvements in or relating to machine adapted for use in the manufacture of shoes
IPC: A43D79/00
Filed: 1961-05-11
Abstract: 980,176. Heel attaching. BRITISH UNITED SHOE MACHINERY CO. Ltd May 11, 1961 [May 12, 1960], No. 17155/61. Heading A3B. A machine adapted for use in driving nails into a heel portion of a shoe comprises a work support, a die apertured to allow the passage of nails therethrough and a nail driving means which subjects the nails simultaneously to a rapid succession of blows. In the construction shown last 42 having a positioning plate 112 on its crown face is mounted on a jack 40 by a spindle 106 of a jack post 96 which engages in a socket of the last, lugs 130 of the jack post 96 engaging positioning faces of the positioning plate 112. Jack post 96 is non- rotatably mounted in a piston rod 91 which in turn is slidably mounted in a bearing post 80 being adjustably clamped in a bracket 72. Belville washers 102 are interposed between the top face of piston rod 91 and a lower face of jack post 96 to avoid damage to the crown face of the last during the nailing operation. Piston 91 is actuated by fluid pressure on piston 136 to clamp the heel end of a shoe 38 against a base lift 34, rubber lift 32 and nailing die 44, the lifts being themselves clamped in a carrier unit 54. Nailing die 44 comprises a plurality of lateral nail tubes 56 and front and rear nail tubes 56a which have formed integral therewith arms 152, 153 respectively. The arms 152, 153 are mounted between a bracket 70 and a cover plate 146, the nail tubes 56, 56a co-operating with openings 145, 147 in the cover plate respectively. A cam plate 160 mounted in bracket 70 possesses four cam ways 162 with which co-operate rollers 170 (not shown), each arm 152 possessing two such rollers, and rollers 172, each arm 153 possessing one such roller. Thus, when cam plate 160 is rotated by bevel gears 190, 188 and a rack and pinion, nailing tubes 56 move away from or towards an axis 156 of nailing die 44 and tubes 56a move rectilinearly along an axis 128 of nailing die 44. The cam plate 160 is calibrated for different nailing tube configurations, the cam plate 160 being locked in these positions by a spring pressed plunger registering with a notch on the periphery of the cam plate. The nailing tubes 56, 56a comprise passages 148, 148a in which move drivers 150. The passages 148 are connected, at their lower ends, to a nail feeding device 48 by plastic nails tubes 197. A nail driving gun 46 comprises a barrel 226 in which an impact piston 232 and a hammer 234 are reciprocable. Barrel 226 has formed at its upper end a high pressure chamber 204 and by a valve 268, pressure inlet channels 262, 264 and exhaust channel 266 causes piston 232 to rapidly reciprocate in barrel 226 striking hammer 234 which in turn depresses nail driver 150. Clamped by a ring 235 to the lower end of barrel 226 is a carrier block 238 to which a stripper plate 244 is resiliently mounted by rods 242 and springs 248 which plate supports the upper ends of nail drivers 150. carrier block 238 is slidably mounted on guide rods 68 (Fig. 3) and also possesses a pin 252 which co-operates with the hammer 234 to prevent rotation of the latter. The gun assembly is mounted at its upper end for vertical movement on a piston rod 210 so that, during the nail driving operation the gun assembly descends until, on the completion of the operation, cam plate 282 yieldingly engages a lever 283 of a pneumatic device which causes the gun to be retracted to its initial position. The nail feeding device 48 is pivoted on the upper end of column 64 and comprises a raceway 418 in which nails 49 move in slots 422 which terminate in further slots 482 formed in a separate plate 480. Offset from slots 482 are a series of grooves 478 formed in the front wall 476 of the feeding device 48 which are arranged above funnelshaped openings 484 in a block 470. Openings 484 are connected with the plastic nail tubes 197. Nails are fed to raceway 418 from a hopper 430 which is pivoted into its feeding position by actuation of piston 456. The movement of piston 456 and associated rod 442 against spring 460 also moves the separator plate 480 to the right as seen in Fig. 14 through links 464, 472, 498 &c. so that nails 49 carried in slots 482 are transferred to grooves 478 whence they fall into openings 484. Rubber lifts 32 and base lifts 34 are fed from a magazine 50 to a carrier unit 54. Magazine 50 is clipped on to the machine and comprises a cavity, heel-shaped in cross-section, in which lifts 32, 34 are loaded in pairs, a base lift 34 being in the lowest position. The lifts are held in the magazine by the clamping action of a piston bearing on one side of a rubber lift. The carrier unit 54 comprises a base plate 300 and a cover plate 308 possessing vertically registering U-shaped openings 312a, 312 respectively. pivotally mounted on base plate 300 are a series of pivotally linked clamping elements i.e. a breast face clamp 364, two pairs of tide clamps 342, 354, the latter pair being resiliently mounted in their links, and a rear clamp 336 resiliently mounted at one end. Since a base lift 34 is larger than rubber lift 32 and is generally used with several different sizes of rubber lifts 32, the base lift 32 is clamped in the carrier unit by leaf springs 368 mounted on the underside of clamps 342, 354, 336. Clamp 364 lines up the breast faces of the lifts 32, 34 accurately so that no trimming will be necessary in this region after the nailing operation whereas the side clamps and rear clamp centre the lift in the carrier. The clamping is effected by the actuation of a piston in cylinder 316 and through links 322, 324. The carrier unit 54 is pivoted on an arm 302 about a lug 306, movement into the heel attaching position being initiated by the movement of piston 396 in cylinder 392, the piston rod of which is pivotally attached to column 64. Nails are fed to nailing die 44 so that the pointed ends of the nails rest in recesses 58 of rubber lifts 32. The nails 49 are subsequently driven through lifts 32, 34 and heel seat 36 of shoe 38 and clinched against last plate 60.  The cycle of operations which is pneumatically powered is controlled by a series of triggering devices which take the form of abutments mounted on parts of the machine. The cycle is initiated by the manual depression of a pair of switches. Specification 863,464 and U.S.A. Specifications 1,948,547, 2,911,645 are referred to.