Patent GB-235286-A (GB)
Title: Improvements in or relating to machines for conforming to a last the heel end portion of boot or shoe upper materials
IPC: A43D75/00
Filed: 1924-03-10
Abstract: 235,286. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). March 10, 1924. Assembling parts; lasting.-An assembling or assembling and heel seat lasting machine is provided with means for pressing a jacked shoe first yieldingly and then positively against a conforming device, such as a heel hand, in timed relation to successive strokes of wiping means, with mechanism for moving wiping means inwardly over the shoe bottom different distances at different times in the operation on the one shoe, and with fastener-inserting mechanism movable to a greater or less extent with the wiping means in the plane thereof and also movable towards or away from the plane of the wiping means. Means a.re also provided for moving the shoe towards or away from the plane of the wiping means in timed relation to the strokes of these means. and for automatically jacking the shoe up to a holddown before starting the machine. The machine illustrated is of the same general type as that shown in Specifications 26698/09, 28473/10. and 28474/10, and includes a main cam shaft 2, Fig. 3, which is driven through gearing 4. 6 by a main driving shaft 8 carrying a pulley. Means for clutching the pulley to the shaft 8 includes an arm 28 carrying at one end a yoke which is connected to a thrust-ring engageable with the pulley. The arm 28 is connected by a rod 26 to a block 24 which is urged upwardly by a spring 22 but is normally held in its lowest, clutchdisengaging position by the engagement of a spring-pressed pawl 38 with a cam slide 42 having a roll 46 engaging an edge cam 48. To start the machine, the pawl 38 is pushed away by the finger 52 of a push rod, allowing the spring 22 to raise the members 24, 28 and so engage the clutch. Rotation of the shaft 2 first raises and then lowers the slide 42, this motion returning the member 24 to its clutch-disengaging position at the end of the cycle. A brake drum on the shaft 8 is connected to the block 24 so that descent of the latter brakes the shaft 8. A flexible heel band 78 is supported at the rear on a stud 82, Fig. 8, vertically movable in a carrier slide 84, and at its sides on blocks 94, Fig. 7, adjustable along levers 92. The band is yieldingly closed on the shoe bv levers 110 connected at one end to the levers 92 by adjustable linkage 112, 114, 116, 118 and having at the other end teeth 126 engaged by teeth 124 on a slide 120. The slide 120 is reciprocated by teeth 134 on a shaft 132 which also carries a pinion 136 engaged by teeth on a hell-crank lever oscillated by a face cam 142, Fig. 3. The band is further pressed against the corners of the shoe end by blocks 102 engaged by spring plungers 106 on the arms 32. The heel band mav be adjusted for different shoes by moving the slide 84 by means of a pinion 146, Fig. 3, on a shaft provided with a hand-wheel. The shoe support or jack comprises a standard 156 in a casing 158 movable about an horizontal pivot shaft 160, Fig. 17. Means for pressing the jacked shoe yieldingly into the heel band after the Jack post has been swung in to starting position includes a rack bar 170, Fig. 3, pivoted to the casing 158 and in engagement with a pinion 168 on a shaft 166. The latter is rotated through the medium of a lever 172, Fig. 28, having on its upper end a roll engaging a cam on the main shaft and connected at its lower end to a pawlcarrier 180, Fig. 25, having pawls 184 engaging a ratchet wheel 182 on the shaft 166. The pawls in starting position engage an adjustable throw-off plate 186 to allow the shaft 166 to turn reversely when the jack is swung forwardly to starting position. The lever 172 is connected to the pawlcarrier 180 through a link 190, Fig. 28, which is connected to a hollow rod 194. The latter is encircled by a heavy spring 212 and encloses a light spring 196. Either the light spring or both springs may be used to rotate the shaft 166 and so impart the first yielding movement to the jack post 156. The second positive movement of the jack post is effected through the slide 120, which is provided with rack-teeth in engagement with teeth on a bell-crank lever 224, Fig. 3, which is connected by a link 226 to a pawl-carrier 228 associated with a ratchet wheel 230 on the shaft 166 and operating in a similar manner to the pawl-carrier 180 and ratchet wheel 182. Movement of the slide 120 to close the heel band consequently also moves the jack post positively. A spring plunger 242 is arranged automatically to return the jack post to a starting position at the end of a cycle of operations. The jack post 156 is adjustably supported on a vertically slidable rod 246, Fig. 17, of which the lower end has teeth 248 in engagement with a pinion 250 rotatable. on the shaft 160 and is adapted to be engaged by an underlying part of a slide 252. The latter is normally held in its lowest position by a pawl 258. When the jack is swung in to starting position, the pawl 258 is disengaged and a spring 254 raises the slide 252, and with it the rod 246 and jack post 156 to press the jacked shoe against a hold-down 264. The upward movement of the jack post is braked by a dash-pot 266. The jack post is subsequently further raised, to hold the shoe more firmly against the hold-down and then to sustain the shoe for the final overwiping and tacking operations, through the pinion 250 and bell-crank lever 224. The pinion 250 is adapted to be clutched adjustably to a member 276, Fig. 17, connected to a rod 302. The latter is connected through cross-heads 306, 308 and springs 310, 312 to a rod 304 pivoted to the lever 224. Movement of the lever 224 raises the jack post yieldingly through the springs 310, 312. Means for operating the pawl 258 to release the slide 252 as before described includes a spring- held rod 318 normally holding the pawl in engaging position. Inward movement of the jack post trips the pawl by the engagement of the rod 318 with stop members. A rod 346 is attached at one end to the cross-head 308 and at the other end to a sleeve member 338, rotation of which permits a spring 326 to return the pawl 258 to an engaging position ready for operation on the next shoe. The slide 252, after moving upwardly to raise the jack post, is returned to its lowest position by a link 352 attached to the lever 224. The jack post may be slightly depressed and swung outwardly, in order to adjust the shoe, if necessary, by means of a hand-lever 364, in which case a link 368 operates to return the slide 252 to its lowest position. The hold-down 264, Figs. 3 and 8, is mounted in a slideway for vertical movement and provided with rack teeth in engagement with a pinion 380 on a shaft 382. The shaft 382 is rotated, to move the hold-down, by a spring- pressed rack bar 384 in engagement with a spiral gear 386 on the shaft, the bar 384 being connected by a rod 388 to a lever 390 having a roll in engagement with a face cam 394. To vary the initial height of the hold-down the spiral gear may be adjusted along the rack bar 384. The wiping means comprise wiper plates 410. Figs. 5 and 8, pivoted to a slide 412 and having an overlying thrust plate 422 adapted to take the upward thrust of the wipers. The wiper plates are guided in their movement by plates 414 and are advanced bodily by means of a slide 424 connected at one end to the slide 412 and having at the other end a roll engaging a cam groove 430, Fig. 3. Operative closing movement is imparted to the wiper plates simultaneously with their advancing movement by means of slides 432, Fig. 5, which are moved through pinions 448, levers 446, and rack teeth 444 on the slide 412. The rack teeth 444 may be adjusted on the slide 412, in order to vary the extent of movement of the wiper plates, by means of eccentric parts on a shaft 426. The machine includes tacker mechanisms for inserting fastenings at the rear end, the corners and the sides of the heel end of the shoe. The end tacker mechanism 464, Fig. 8, is mounted on the wiper slide 412 by means of a spring-held slide 468 so that the tacker mechanism .advances with the wipers until a pin 476 on the slide 464 engages a stop block 478, when the spring 470 allows the wipers to advance alone. The side tackers 480, Fig. 5, are similarly mounted for limited movement on the slides 432 and the corner tackers 498 are similarlv moved to a limited extent by movement of the slides 432 through the pinions 448 and pinions 500 and rack bars 502. there being a yielding connection between the bars 502 and tackers 498. All the tacker mechanisms are adjustable to determine the distance of the tacks from the edge of the heel seat. Each tacker mechanism includes a tack block 516, Fig. 8, in which slide tack throats 518 provided with spring-held tack fingers 522. Tacks are supplied by flexible tubes 532 from an oscillating tack-hopper of ordinary construction. Drivers 520 are carried by bars 540, Fig. 3, slidably connected to a common driver head 544. Driving impulse is imparted to the latter by springs when released by a cam 560 through a link 558 and lever 554. The tack throats 518 are lowered within the blocks 516 towards the wiper plates just prior to the tackdriving operation by means of spring-pressed rods 568, which are normally held in raised position by means of lugs on the drivers. In operation, the jack is moved inwardly by hand, releasing the slide 252 to raise the jack against the hold-down. The machine is then started and the cam 178, Fig. 30, imparts the first rearward yielding movement to the jack against the heel band and the cam 394 becomes effective to lower the hold-down and jack, causing the heel band to wipe the upper upwardly. The cam 142 then operates through the slide 120 to close the heel band on the shoe and at the same time to move the jack positively backwardly into the heel band, and the slide 248 is operated to force the shoe more firmly against the hold-down. At the point marked a, Fig. 30, the wiper cam