Patent GB-213594-A (GB)
Title: Improvements in or relating to machines for preparing welted boots or shoes for the application of the outsole
IPC: A43D47/00
Filed: 1924-03-27
Abstract: 213,594. United Shoe Machinery Corporation, (Assignees of Goddu, G., and Mackenzie, F. L.). March 28, 1923, [Convention date]. Loose-nailing. - A machine for welt-butting and tacking or completing the lasting of a welted shoe before sole-laying &c. has tacker nozzles pressed against the work irrespectively of variations in the thickness of the material. The tack supply and handling mechanism is arranged for easy inspection and dissembly in case of clogging. Two swinging frames, one for each side of the shoe, carry duplicate sets of butting and tacking mechanisms, and are pivoted on vertical rods 8, Fig. 3. The rear ends of the frames are pulled together by a spring, an adjustable stop determining their distance apart at the front for the introduction of the shoe. The frames have meshing gear segments so that one moves through the same angle as the other. The shoe is positioned with the welt supports in the welt crease and the heel end of the shoe against a back rest or gauge 50, Fig. 5, provided with an adjustable height gauge 120. The back rest 50 yields against a spring as the shoe is pushed back into place. Alternatively, the back rest may be set by a handle 80. The operator then depresses a treadle linked to an arm 142, Fig. 8, on a rock shaft 144. An arm 158, Fig. 5, on a sleeve on the rock shaft and connected thereto by an adjustable spring separates the rear ends of the side frames by toggle bars 160 and forces the welt supports in to the crease. The movement of the rock shaft also pulls on a link 284 yieldingly connected to a wedge 274 engaging the tails of levers on which are mounted pads 258, Fig. 7, thus caused to engage the sides of the shoe. The wedge 274 is freelv slidable laterally to equalize the pressure on the two sides. Further movement of the treadle causes the end of the arm 142, Fig. 8 to operate a lever 182 and trip a one-revolution clutch connecting a constantly driven spiral gear 26 with a shaft 28. This shaft has a crank linked to a piston 36, Fig. 5, having a H-shaped connecting rod 39 the slots of which engage slides actuating the cutting and tacking mechanisms. On the end of the shaft 28 is a disc 242 to lock a bar 232 holding the rocking shaft 144 in the position into which it has been moved by the treadle. The shaft 278 operating the wedge 274 is held in the position to which it has been moved by the treadle by a pawl 304 carried by an arm 300 keyed to the shaft 278. The tail of the pawl is released by a rod 308 operated by an arm 312 on the rock shaft 144 so that the pawl may engage a, rack 318 by which the predetermined final pressure is given to the pads. This final pressure is determined by an adjustable spring 332, the upper arm of which is depressed by a crank 338 on the disc 242. The end of the connecting-rod 39 carries a button 112 which, when the machine starts, allows a pawl 106 to engage with teeth on a ratchet 104 locking the back rest 50. As the connecting-rod moves rearwardly the button 112 yieldingly engages the bars 160 and forces the welt supports firmly into the crease. The tack delivery mechanism comprises a tack pot 552, Fig. 15, rotated by a pinion 578 and provided with vanes 602 which deliver tacks to a spill pan 600 and raceways 604, 605. The raceway unit is held in place by a hook 718 engaging a pin 620 passing through a hole 622 in the unit, the hook being lowered when inspection is required by a thumb nut 722. Clearer fingers 588 are rotated from the pinion 578. An oscillating separating blade 624 delivers a tack at each cycle to slots 630, 632 in an end block unit held in place by a latch. A lid 712 is provided for inspection in case of clogging. The gear-segment 509, Fig. 3, reciprocating the driver bar slide, is operated from the link 354, positively by a lug 510, to raise the slide; and resiliently, by a spring 518, to depress it, so that the tack nozzle 468 forces the upper firmly into contact with the insole and last prior to the insertion of the tack.