Patent GB-131124-A (GB)
Title: Improvements in or relating to Machines for Conforming Boot or Shoe Uppers to the Shape of the Last.
IPC: A43D21/12
Filed: 1918-08-10
Abstract: 131,124. British United Shoe Machinery Co., (United Shoe Machinery Corporation). Aug. 10, 1918. Lasting.-An endlasting machine of the type described in Specifications 14831/09 and 25492/13 having opposed shoeclamping members, wipers, and grippers to engage the upper margin at opposite sides of the shoe end, and in which at least the major portion of a relative movement between the shoe and the grippers occurs subsequently to the closing of the clamping members, is arranged so that the wipers yield bodily lengthways of the last during up-wipe, but are moved positively over the edge of the last, to close a predetermined amount; further, the machine is arranged so that it stops automatically at predetermined points in a cycle, and means are provided for reversing the machine between these points to allow part of the cycle of operations to bo repeated. The various instrumentalities of the machine are actuated from a cam-shaft 6, Figs. 4 and 16, which is driven by gearing from a main shaft 4 and carries a disk 19 formed with notches 20, 21, 22 adapted to be engaged by a roll 23 on a spring-pressed pivoted lever 24. By depressing a treadle lever 14, a bar 27 is lowered to swing the lever 24 downwards, and simultaneously a lever 9 is moved to force a clutch cone into engagement with a rotating pulley on one end of the main shaft 4; at the same time, a latch 29 is swung to hook beneath the end of the pivot pin 25 of the roll 23 to lock the bar 27 and lever 24 so that tho treadle may be released without the clutch being disconnected. After part of a cycle the roll 23 drops into the next notch in the disk 19, permitting the bar 27 and lever 24 to swing upwards to trip the latch 29 and break the clutch to stop the machine. A second treadle lever 42 may then he depressed to actuate a similar clutch, lever, and bar mechanism at the opposite end of the shaft 4, whereupon the shaft is driven in the reverse direction until the roll 23 drops again into the first notch in the disk 19 and stops the machine; by depressing the lever 14, the previous part of the cycle of operations may be repeated. The wipers 49, Figs. 4, 21, and 23, pivotally connected and provided with the usual formed edges, project from an open-ended slot in wiper plates 48, which are themselves mounted in a similar slot in laterally-extending flanges of a wiper head 46, a tubular stem 45 of which is located in a bore in a rocker head 44. This rocker head is rocked about trunnions 43 by the engagement with a cam 51 on the shaft 6 of a roll 53 projecting from an adjustable spring-pressed slide mounted in an enlargement on the rear of a tail-piece 50 of the rocker. The wiper head 46 is reciprocated by a. bar 60 actuated from a cam on the shaft 6. This bar, which is threaded and fitted with an adjusting nut 64, projects into a bore in the stern 45 and carries a collar 66, which is pressed against a ring 65, secured in the rear end of the bore of the stem, by a spring 67 adjustable by a block 68 and screw 69. The spring 67 and nut 64 provide for a limited, adjustable, yielding, forward movement of the wipers to compensate for variations in the thickness of the upper materials or the size or shape of the ends of lasts, and also to permit a slight rearward yielding movement of the wipers during up-wipe along the slanting end of the last. The wipers are closed by a cam-actuated bar 73 pivoted to an equalizing bar 74, Figs. 14 and 21, through each end of which extends the shank of an eyebolt 75. A rod 76 formed at one end with a toothed head 77 extends through this bolt, its other end being reduced to form a shoulder 78 and threaded to engage an eye-bolt 81 extending freely through an opening in an ear 82 on the corresponding wiper plate 48. A collar 79 is normally forced against the shoulder 78 by a heavy spring 84, adjustable by a nut 83, a lighter spr:rg 85 being sleeved on the rod 76 between the eye-bolt 75 and a member 80, which is threaded on the collar 79 and is adjustable to change the combined effective length of the member and collar. The wipers are thus closed yieldingly, first the springs 85 and afterwards the heavier springs 84 being compressed. When the wipers reach a position to be advanced over the edge of the last, the springs 84, 85 are locked against expansion by a spring-pressed dog 87 engaging the toothed head 77, and the wipers are left entirely under the control of the actuating cams of the bars 60, 73, with the result that the wipers receive a predetermined over-wiping movement; the dog 87 is automatically released when the wiper head approaches the limit of its rearward movement. The lasted shoe is supported on a jack comprising a self-acoommodating padded toe-rest 95, Fig. 4, carried by a spring-pressed adjustable post 94 mounted in a slide 93, which is automatically raised in timed relation to the movements of the wipers by connexions 109, 108 with a cam on the shaft 6. The heel portion of the last is mounted on an adjustable cap 116 carried by a spindle 114 pivoted at 115 to a carriage 110, which'also carries a vertical member 117 to form a rest for the heel end of the last. The carriage is carried by a platform 112 adapted to be swung over a curved guide-track 113 for lasts of different swing, or for rights and lefts, while the carriage itself may be adjusted by a rack and pinion 118, 120; a pawl and ratchet is provided to lock the carriage in its adjusted position. The last is clamped on the jack by a holddown 123 carried by an adjustable post 124, the reduced end of which is threaded into a. sleeve 133 carried by a yoke-piece mounted between arms 130 of a U-shaped rocker frame, which is swung about a shaft 129 by a cam-actuated lever 128. A second hold-down 138 carried by a post 139 and actuated similarly to the hold-down 123 is provided to engage the extreme end of the shoe sole; the holddown 138 is connected to the rod 139 in such a manner that it will yield if by any chance it is engaged bv the wipers. To stretch the upper, the machine is provided with an end pincer 147, Fig. 10, and two side or corner pincers 146, Fig. 11, each of which comprises a slotted head 148 carrying an integral pincer jaw 149 and a movable jaw 151, which is supported by a short pivoted link 152 and operated by a second link 153; the rear end of the link 153 is slotted to receive a roller 154 mounted in the forked end of a rod 155. The end pincer 147, Fig. 10, is carried by a camactuated frame 156 having an opening to receive a stem 150 integral with the head 148, and a second opening for the rod 155, which is adapted to be operated, against the action of a spring 168, by a cam-actuated arm 158. The two side pincers 146, Fig. 11, are similarly closed yieldingly through levers 171, which are connected to turn together by a bar 172, Fig. 6, having a rearwardly extending arm 173 engaged by a cam on the shaft 6. Instead of being directly mounted on the carrier 156, each side pincer is carried by a swing- ing plate 182, Figs. 6 and 11, pivoted at 183 to the carrier and actuated through an adjustable rod 184 and bell-crank from the cam-shaft 6; the stem 150 passes through the plate 182 forwardly of the pivot 183 so that when the plate 182 is swung the pincers are moved toward or from the sides of the last. The plate 182 is slotted at 190, 191 concentrically with the stem 150 to receive, respectively, the closing rod 155 and a supporting stud 192, to the lower end of which is pivotally connected a hand-lever 194. This hand-lever is connected to the rod 155 so that the pincers may be closed manually; if desired, the pincers may be lifted bodily by a further movement of the handle; which may also be pressed backwards while being pulled downwards to swing the plate 182 and so spread the upper laterally.