Patent GB-110923-A (GB)
Title: Improvements in or relating to Machines for Assembling Parts of Boots or Shoes.
IPC: A43D21/12
Filed: 1916-10-06
Abstract: 110,923. British United Shoe Machinery Co., (United Shoe Machinery Co.) Oct. 6, 1916. Assembling parts.-In an assembling machine of the type described in Specification 20,010/05, a last carrying the shoe parts is placed on a jack pin 282, Fig. 2, adjustable as to one of two heights in a jack post 16, Fig. 4, which is mounted to slide in a support. 12 pivoted at 14 to the machine frame. When the post is swung inwards from its work-receiving position, in which a collar 18 rests on an adjustable frame 20 while a roll 32 on a pivoted lever 30 engages one arm of a forked lever 22, the roll 32 permits a weight 44 to raise the forked end of the lever 22 so that the other arm of the fork engages and lifts the jack post, and when the roll rides off its arm, the weight. 44 operates automatically to move the work into engagement with an insole-engaging stop 274, Fig. 2; this stop is pivotally mounted on a wiper carrier and is yieldingly maintained in a vertical position by a spring pin 278. The inward position of the jack post is determined by the engagement of the shoe with two V-shaped tack blocks 88, 90, and, when the machine is started, the shoe is forced firmly into these blocks by the engagement of a cam 58 on a spring-pressed hook 46, Fig. 4, with a roll 56 on the frame 20. The jack is locked against depression by a pair of pawls 78 engaging a ratchet on the lever 22, the pawls being subsequently released by a cam block 74 on a lever 62 in connexion with a bell-crank actuated from the main drive shaft. The tack blocks 88, 90 form part of slides 92, Fig. 11, movable in guides 93, Fig. 12, and each is normally pressed forwards by a spring-pressed plug 96, Fig. 11; the rear ends of the slides engage an equalising-lever 98, Fig. 14. Either or both of these rocking-mechanisms may be rendered inoperative when desired. Each slide 92, Fig. 11, carries a tack-driving mechanism 106 adjustable about a bolt 108 by turning a screw 112; the delivery openings 110 for the tacks being transversely elongated. The tack block 90 and its tack-driving- mechanism are carried by a slide 114, Fig. 12, connected by a T slot and guide to a slide 116 carrying the other tack block 88, this slide being similarly connected to a third slide 118. A clamping-bolt 120 passes through slots 152, 154 in the slides 114, 116, through the slide 118 where it is engaged by a spline 125, and then through a slot 122 in a wing 124, and at its outer end it carries a clamping-nut 126 formed integral with a handlever 128. A rack slide bar 130 is arranged in grooves between the wing 124 and the slide 118 and is movable vertically with this slide by means of a hand-wheel 140. A headed clamping-screw 142 threaded in the slide 116 passes through slots 148, 150 in the slides 114, 118, and is adapted to clamp the slide 116 to either of the other slides according to the direction in which it is rotated. The end of the bolt 120, Fig. 2, carries a lever 164, one arm of which is toothed to mesh with a rack block 170 on the slide 114, while the other arm carries a spring pin 172 to engage with one or other of holes 174 in an arm 162 of a bell-crank also mounted on the end of the bolt 120; the other arm 160 of this bell-crank is connected to a link 176 having a pin and slot lust-motion connexion 182, 184 with a lever 178, which is movable about an adjustable pivot 180. The link 176 is formed with a shoulder 104 engaged by a roll 192 on an elevating bar 186 having at its end a spring plug 196 which bears on a cam 198 on the machine frame; this cam is formed with a face 200 concentric with, and a face 202 eccentric to, the pivot 188 of the lever 186. A wiper 258, Fig. 2, is mounted on a carrier 240, pivoted at 242 for oscitlating movement, on a wiper carriage 216, Fig. 9, which is slidingly mounted on guide-bars 218, 220 and actuated by' the engagement of a cam roll 234 carried by an adjustable block 224 with a cam 236 on the main drive shaft. The carrier 240 is pressed downwards yieldingly.by a spring plunger 252, Fig. 8, bearing on a shelf 256, which slides over a block 266 carried by a centrally pivoted lever 268; this lever is controlled by a cam face formed on the periphery of the cam 236 for the purpose of raising and lowering the wiper into and out of engagement with the work. The carrier 240 also houses a spring-pressed sliding block 262, Fig. 2, which carries a back presser 260 adapted to engage the back of the upper to assist in forming a well-defined edge at the heel. In operation, after the shoe has been seated against the blocks 88, 90 and the jack locked against depression, the wiper carriage 216 is moved forwards and the wiper 258 wipes the upper materials over the edge of the last. Simultaneously with this movement, the lover 178, which is hung on the pivot 242, moves the link 176 rearwards and, assuming the slides 116. 118 to be clamped together, this lowers the slide 114 and tack block 90 so that the block has a wiping action on the shoe in a direction opposite to that of the. wiper 258. Tacks are then driven through the wiper and the blocks 88, 90. The wiper 258 continues to rise until it is clear of the work, and is then moved backwards. The hook 46 is then raised and the pawls 78 are tripped to release the jack, which is then drawn forwards depressing the end of the lever 22 which operates through a link 204, Fig. 4, carrying a spring-pressed collar 214 to engage a projection 208 from the lever 186 to move the lever 176 forwards so that the tack block 90 is returned to its original position. The arrangement of the slides 114, 116, 118 provides for adjustment of the height at which the upper tack is driven into the counter, while the spacing between the blocks 88, 90 may be varied by inserting the pin 172 in a different one of the holes 174. By clamping the slides 114,. 116 together, both tack blocks 88, 90 will be moved to exercise a downward wiping action on the shoe; if the block 90 tends to drag the upper downwards, the pivot pin 100, Fig. 14, of the equalizing-lever 98 may be shifted into an upper hole 101 to cause the block 88 to clamp the work with greater pressure than the block 90. When it is desired to use only one tack block, as when working upon small shoes, the equalizing movement of the blocks 88, 90 may be prevented by turning a thumb.nut 102, Fig. 11, behind a shoulder on the corresponding slide 92. Instead of the stop, 274 a combined stop and gripper may be used, Fig. 15, comprising a jaw 320 carried by a lever 322 pivotally mounted on the wiper carrier 240. The jaw is normally held away from the upper by an adjusting screw 832 engaging a fixed arm 328, but is pressed towards the wiper by a spring plunger 334. As the wiper advances, the upper is gripped between it and the jaw 320 and drawn tightly against the last. In a modified construction of machine, the hook 46 swings the jack backwards to seat the shoe first against an upper tack block 88*, Figs. 19, 20, and 21, which is yieldingly pressed forwards, and then against a second tack block 90* rigidly mounted to engage the shoe near the cone of the last.- At the same time, a gripper 320* is released to grip the upper between it and a nose on the wiper 258*. A tack is then driven through the lower tack block 90*, and the wiper then advances with the grippar 320* so that the upper is tensioned upwardly along the back of the last from the tack already driven. During this movement, the upper is gradually withdrawn from between the wiper and gripper, and is laid down on the shoe bottom by the wiper. Finally, tacks are driven through the wiper and the upper tack block 88*, that through the tack block being located to one side of the back seam. The tacks in the back of the heel are preferably left with their heads upstanding, to facilitate subsequent withdrawal. Brackets are arranged on either side of the gripper 320* to serve as guides, and are provided with holes so that a pin may be placed in one pair of them to limit the outward movement, or, if desired, to prevent the closing movement of the gripper. Specifications 24,670/06, 15/08, and 24782/10 also are referred to.