Patent GB-188765-A (GB)
Title: Improvements in or relating to machines for inserting fastenings
IPC: A43D69/04
Filed: 1921-08-16
Abstract: 188,765. British United Shoe Machinery Co., Ltd., (United Shoe Machinery Corporation). Aug. 16, 1921. Slugging.-A machine intended primarily for inserting fastenings in the manufacture of boots and shoes comprises means, including counting and measuring mechanisms, for inserting fastenings of different lengths, and particularly to cause the first and last fastenings of a run to be long ones. To this end the machine operates through a single cycle to insert a long fastening after the treadle is operated to stop the machine, but before the clutch is thrown out. The machine comprises a column 32 carrying the work support 36, and a column 30 carrying a head 34, motor 40 and a hollow bracket 42. The head 34 contains the main cam shaft 54, with its driving pulley 48 and clutch 50, and carries a support 56 for the awl and driver and associated parts. The awl 58 is clamped in a holder 64 on an awl 'bar 66 mounted in a carrier 68 for vertical reciprocation by links 86, 88, 92, Fig. 15, cam roll 94 and cam track 96. The carrier 68 is oscillated about the main cam shaft to feed the work by a link 70 adjustably connected to an arm 74 oscillated through an arm 76, cam roll 78 and track 80. The driver 60 is carried by a bar 100 reciprocated by a rack 102 and a gear segment 104 on an arm 106 carrying a cam roll 110, Fig. 13. The wire from which slugs are cut is supplied from a reel 114 by feed rolls 118, 120, Fig. 11, and guide members 122 to cutters 124, 126, Fig. 5, and transferred to driving position by a throat member 128, Fig. 12, reciprocated by a bar 130, a gear segment 132, Fig. 15, on an arm 134, having a cam roll 136 operating in a track 138 on the shaft 54. The cutters are carried by holders 140, 142 having respectively a shaft 144 and a sleeve 146 operated by cam rolls from the main shaft in such a way that the cutters first bite into the wire and then move to the right to co-operate with the throat 128 to sever the slug by a shearing action. In order to return the end of the uncut wire to the left after severing, as viewed in Fig. 5, the end of the wire enters an opening in a member 168, Fig. 12, floating in ways 170 and engaged by a finger 174 on the cutter 124 as the latter moves back after each cutting operation. The idle feed roll 118, Fig. 11, is journaled on a lever 178 and its pressure on the wire can be adjusted by a pin 180, rod 184, spring 194, and wing nut 196. A bell-crank lever 186 and eccentric 188 enables the roll 118 to release the wire altogether. The live feed roll 120 is formed with an internal ratchet 200 engaged by spring-pressed pawls 204 on a carrier 208 fast on a shaft 214, Figs. 6 and 10, so that rotation of the shaft 214 also rotates the, roll 120. Fast on the shaft 214 is a ratchet segment 216 provided with an adjustable cam member 217 and a shoulder 220 arranged for engagement with a shoulder 222 on a feed control lever 224 fulcrummed on the bushing 199, Fig. 10, and provided with a notch 226. A spring-pressed pawl 228 pivoted to au arm 230 journaled on the shaft 214 can enter the notch 226 to engage the segment 216. A spring 233 tends to move the shaft 214 and segment 216 in a counter-clockwise direction. The arm 230 is oscillated by a cam roll 242, Fig. 5, on an arm 238 having a gear segment 236 meshing with a segment 234 on the arm 230. During this oscillation the pawl 228 only engages the segment 216 when it reaches the notch 226, and the extent of movement of the segment 216 determines the length of wire fed by the roll 120. Mechanism for varying the position of the notch 226 comprises a shoulder 250 on the lever 224 which contacts, when a short fastening is to be formed, with a stop 252 on a spring-held lever 254 fulcrummed on an adjustable block 258. A scale 264 indicates the position of the block 258 for various lengths of short fastenings. Long fastenings are formed when the stop 252 is depressed from the path of movement of the shoulder 250, the lever 224 being then moved by a spring 266 to an extent determined by the position of a stop 272 adjustably held over a scale 276 and engaged by a lug 278 on a pawl 280 pivoted to the lever 224. So long as the lug 278 is not in contact with the stop 272 the pawl 280 remains in engagement with the teeth of the segment 216 so that the lever 224 and segment 216 retain their relative positions with each oscillation of the pawl 228 until the cam member 217 depresses the lever 254. The lever 224 then rotates until the stop 272 disengages the pawl 280 from the teeth 216, when the segment 216 is rotated by its spring 233 until its shoulder 220 contacts with a shoulder 222 on the lever 224. In this position the pawl 228 engages a tooth of the segment 216 sooner than normally, feeding a longer fastening. At the same time the cam 217 has moved again to the night, so that short fastenings are there after formed. The cam member 217 may be adjusted over a scale 288 to vary the number of short fastenings formed. In order to cause the first and last fastenings of a run to be long ones the lever 254 can be depressed by the engagement of its shoulder 290 with the extremity 292 of a bell-crank lever 294, Fig. 3, rocked by a link 298 and normally held clear of the shoulder 290 by a spring 304. When the machine is stopped a bell crank lever 310 which engages the rod 298 is rocked in a counter-clockwise direction, causing the finger 292 to depress the lever 254, and this condition is not disturbed until after the measuring of the first fastening of the next run. If it is desired that all except the first and last fastenings shall be short ones a latch member 312 is engaged over the lug 278 so that the pawl 280 does not engage the teeth 216 and the lever 254 is not depressed by the cam 217, but only by the lever arm 292 at the end of the run. To cause all the fastenings to be of one length the lever 292 may be rendered inoperative by enengagement of a latch 316, Fig. 3, behind a collar 320 on the rod 298. A short throw treadle 324, Fig. 17, pivoted to the base of the machine is connected to a rod 328 pressed downwardly by a spring 330 and connected at its upper end to the bell-crank lever 310 to operate the rod 298. A pair of collars 336 on the rod 328 receive one arm of a three armed lever 338 rigidly carried by a shaft 340 which also carries an arm 342, Fig. 18. An adjustable stop 341 on the bracket 42 limits the counter-clockwise movement of the lever 338. Journaled on the shaft 340 is a lever 344 connected by a spring 346 to the arm 342 so that a shoulder on the arm 342 engages the portion 348 of the lever 344. A pulley 352 on a counter shaft driven from the motor 40 and pulley 48 has a cam track engaged by a roll 360 on a slide 362, Fig. 18, which is reciprocated thereby. A vertically movable slide 366 carries a spring pressed latch lever 370 adapted to be snapped behind a plate 376 on the slide 362 by yielding pressure of a plunger 374 on the arm 342 when the latter is rocked in a clockwise direction. Thus the slide 366 rises with the slide 362 and is locked in elevated position by a hook 380 on the lever 344. This rise of the slide 366 elevates the work support through a rack 384, gear segment 386, links 388, 392, 394 and a bell crank lever 398 pivoted to a toggle member 400 and to a lever 404 connected at 406 to the work support. By the engagement of a cam roll 414 on the lever 404 with a cam 416 on the lever 394 the lever 404 is first rocked to raise the work-support, and the toggle member 400 is then raised. A bell-crank lever 420 is pivoted to a rod 424 the upper end of which is connected to a bell-crank lever 428 Fig. 3, carrying a cam rolf 430 in a cam track 432. The depending arm of the lever 420 is connected by a link 436 to the upper end of the member 400 and to the lower end of a toggle member 440 which is pivoted at its upper end to a ratchet slide 442 normally depressed by a spring 414 and engaged by two spring pressed pawls. Each pawl has a depending tail arranged for engagement by a nut on the link 436 so that as the lever 420 is oscillated the pawls alternately engage and disengage the slide 442. During driving the pawls are out of engagement so that the slide is depressed, holding the toggle 400, 440 straight and supporting the work-support 36, but after driving the slide is elevated and locked by the pawls, permitting breaking of the toggle for work feeding by the awl. The clutch member 50 is operated by the slide 366 through a rod 466 and clutch controlling mechanism comprising toggle members 478, 480, Fig. 4. The member 478 is pivoted to a lever 470 carrying a cam roll 472 in engagement with a cam track 474. The member 480 is pivoted to the arm of a clutch lever 482 the upper end of which is bifurcated to straddle the hub 486 of the clutch 50. A spring 492 tends to throw the clutch into driving position while the toggle is maintained straight by the action of a lever 494 spring pressed at 502 and having a block 498 engaged by. a latch 500 on the member 480. A spring 504 tends to straighten the toggle. Pivoted to the lever 494 is a link 508 connected through a lever 510 to a latch member 514 clamped to the rod 466. A lever 520 having a shoulder 522 in engagement with the latch 514 is adapted to be rocked against the action of a spring 529 by an arm on the lever 482 to release the rod 466 when the lever 482 is moved to throw out the clutch. As the machine stops the slide 366 and rod 466 are lowered sufficiently to straighten the toggle 478, 480, moving the roll 472 against the track 474 and rocking the lever 482 to throw out the clutch and release the lever 520 and latch 514, when the slide 366 drops to its lowest position, permitting lowering of the work support. In order to ensure that the last fastening shall be a long one, the machine is arranged to operate through a single cycle after the treadle is released. To this end a latch member 532, Fig. 17, is held by a spring 534 with a tappe