Patent GB-1087698-A (GB)
Title: Improvements in lasting
IPC: A43D21/12
Filed: 1966-07-01
Abstract: 1,087,698. Boots &c. J. S. KAMBORIAN. July 1, 1966 [July 14, 1965; Feb. 18, 1966], No. 29582/66. Heading A3B. A lasting machine has a shoe support for supporting a shoe bottom down in the machine and wipers which operate in the following sequence:-first shank wipers are advanced in a wiping stroke and are retracted, then toe wipers are advanced to wipe the toe and forepart of the shoe and finally ball wipers are advanced to wipe the lasting margin between the shank and forepart of the shoe. As described the machine is a lasting machine for lasting the whole of the shoe bottom and includes a forepart lasting assembly 12 and a heel and shank lasting assembly 14. The forepart lasting assembly includes toe rests 62, 56, an adhesive applicator 112, a toe hold down 356, a toe gripper 176, side grippers 324, a toe retarder 210, side retarders 234, a toe band 426, side clamps 466, toe wipers 414 and ball wipers 500. A toe post 24 is movable heightwise in the machine by an air motor 20 and carries at its upper end a toe post extension 36 (Fig. 5). A slide 37 is adjustable heightwise in the toe post extension 36 by means of screw 46 and nut 44 and carries at its upper end a toe rest 56 and two slide rests 62. The toe post 24 is movable between a lower inoperative position and a raised position determined by a stop (not shown) in which the insole rests 56, 62 are slightly above the top surface of the toe wipers. Also mounted in the toe post extension is a slide 90 carrying a support 92 for the adhesive applicator 112. Pin and slot connections 102, 104 and 106 and springs 98 allow a floating action between the applicator 112 and its support 92 so that the applicator 112 can accommodate itself to the contour of shoe bottom. The applicator 112 and its support 92 can be lowered to an inoperative position by a toggle 86, 88 operated by an air motor 80. The applicator 112 is supplied with molten thermoplastic adhesive from a single stroke pump (not shown) via a flexible pipe 142, and channels 144, 138, 132, 134, 130 and 128. The flexible pipe 142 is heated by a wire 148 and the applicator is heated by an electric heater 146. Mounted on a bracket 76 on the toe post extension 36 is a housing 150 which accommodates the toe retarder 210 (Fig. 9). The toe retarder 210 is carried at the upper end of a slide 206 which is movable heightwise by an air motor 194. A second housing 152 is pivoted to the housing 150 at 156 and the angular positioin of the housing 152 can be adjusted by an eccentric cam (not shown). A slide 172 is movable heightwise in the housing 152 by an air motor 164 and carries at its upper end a gripper jaw 174 and at its lower end two air motors 180. The piston rods of the air motors 180 are connected to a slide 188 having a gripper jaw 210 at its upper end. Actuation of the motors 180 causes the toe gripper 176 to close and actuation of the motor 164 causes the toe gripper 176 to be lowered to tension the upper. The side retarders 234 (Fig. 14) are carried by the piston rods 230 of air motor 226 mounted in housings 216 and are guided in their heightwise movement by splines 240 and grooves 242. The housings 216 are mounted on guides 212 on the bracket 76 and can be adjusted widthwise of the shoe by screws 220. The side grippers 324 (Fig. 23) have jaws 328, 330 which are closed by the tapered end 340 of the piston rod 342 of air motor 318 and which are lowered to tension the upper by air motor 298. The side grippers 324 are carried by universal couplings (not shown) on a plate 244 (Fig. 5) which can be adjusted heightwise on the toe post 24 by a screw 250 and nut 252. The universal couplings can be rotated by a bevel gear (not shown) and can be moved along slots in the plate 244 to adjust the angular and lengthwise position of the side grippers 324. The universal couplings allow the side grippers 324 to move with the upper during the pulling over operation, the initial position of the grippers 324 being determined by adjustable stops (not shown). The toe hold down 256 (Fig. 1) is carried by a bell crank 344 pivoted to the machine frame at 348 and is operated by an air motor 352. The forepart and ball wipers, toe conforming pad and side clamps are carried in a wiper head 358 (Fig. 1) which is pivoted to the machine frame at 360 and which can be swung from a raised inoperative position to a lower operative position by air motors 364. The wiping assembly (Fig. 25) is mounted on a slide plate 368 which can be moved between a forward operative position and a rearward inoperative position in the wiper head 358 by an air motor (372). The toe wipers 414 are carried by wiper cams 404 having cam slots 408, 410 which co-operate with pins 406 on the slide plate 368. The toe wipers 414 are operated by an air motor 382 which is connected to the wiper cams 404 via a bell crank (390) a connecting member 396 and links 412. The ball wipers 500 are pivoted to the toe wipers 414 at 502 and are operated by air motors 504 which are connected to the ball wipers 500 via links 510, bell cranks 512 and links 514. The toe conforming pad 426 (Fig. 29) and side clamps 466 are mounted on a cover plate 422 which is secured to the slide plate 368. The toe pad 426 is carried at its rear end 482 by a bracket 440 which can move rearwards against a compression spring 442 and at its forward ends 484 by brackets 476 which can move outwards by a limited extent determined by pin and slot connections along rods 406 against compression springs 478. Springs 486 and 496 also urge the toe pad 426 against the shoe. The side clamps 466 are carried on the inner ends of the rods 460 which are connected to the cylinders 456 of air motors 452. Actuation of the air motors 452 causes the side clamps 466 to engage the shoe and when the pins reach the end of the slots causes the toe band 426 to exert increased clamping pressure on the shoe. The heel and shank lasting assembly 14 includes a heel rest 610, a heel hold down 890, a heel band 806, heel wipers 680, shank wipers 746 and adhesive applying nozzles 928. The heel lasting assembly 14 is carried by a slide plate 534 (Fig. 32) mounted in a wiper head 532. The wiper head 532 can be moved heightwise from a low inoperative position to a raised operative position by an air motor 518 and the slide plate can be moved from a forward inoperative position to a rearward operative position by air motors 538. The slide plate 534 carries at each side an arm 879 (Fig. 1) and bell cranks 884 which carry the heel hold down 890 are pivoted to the tops of the arms 870. The heel hold down 890 is operated by air motors 880. Also mounted on the slide plate 534 is an adjusting plate 556 (Fig. 32) having rollers which run in arcuate guides in the slide plate 534. The adjusting plate 556 can be rotated about a vertical axis by a pair of air motors (572, 582) between two positions determined by adjustable stops so that the heel lasting assembly can accommodate left or right shoes. The adjusting plate 556 can also be tilted by rotation of nut (560) so that the heel wipers 680 can be aligned with the shoe bottom. The heel rest 610 can slide heightwise in a guide (608) formed at the rearward end of the adjusting plate 556 and can be moved from a raised operative position to a lowered inoperative position by a toggle operated by an air motor 640. The heel wipers 680 and shank wipers 746 are carried by plates 658, 672 (Fig. 43) which are resiliently mounted on the adjusting plate 556. The heel wipers 680 are mounted on wiper cams 678 which are housed between the plates 658, 672 and which are connected by links 692 to a slide 688. The slide 688 can be moved rearwardly to operate the heel wipers 680 by air motors 696. The shank wipers 746 are carried by brackets 712 which are resiliently mounted on the plates 658, 672. The shank wipers 746 are operated by air motors 736 and consist of a wiper blade 746 e.g. of rubber, which is carried by a wiper support 742 and which has a cover plate 748. The heel clamping pad 806 is mounted above the plate 672 and consists of an inflatable pad 808 carried by arms 812 on blocks 780 which can slide on the ends of arms 678. The blocks 780 are connected to air motors 764 and actuation of the air motos 764 initially causes the blocks to slide rearwards so that pad 806 moves towards the shoe and when links 792 engage stop screws 798 causes the arms 768 to pivot about pins 770 so that the ends of the pad 806 move inwards to clamp the shoe. The adhesive applying nozzles 928 (Fig. 1) are supported on a linkage (not shown) for movement lengthwise, widthwise and heightwise of the shoe. The nozzles start at the heel end of the shoe and are moved toewardly and are urged outwardly so that the nozzles 928 are guided along the edge of the insole by the downwardly extending lasting margin. The nozzles 928 are supplied with molten thermoplastic adhesive from a single stroke pump 968 and apply the adhesive from the heel to the forepart of the insole. The machine has an automatic pneumatic control circuit and operates as follows:-with the toe post in its raised position the operator places the shoe on the insole rests 62, 66 using the retarders 210, 234 as a gauge, inserts the lasting margin in the grippers 176, 324 and depresses a treadle 1054 (Fig. 1). The toe and side grippers 176 and 324 then close and move downwardly to tension the upper and the toe hold down 356 is lowered. The slide plate 368 carrying the forepart and ball wiping assembly then moves forward to its operative position and the wiper head 358 swings downwardly so that the toe pad 426 exerts a downwiping action on the upper and the retarders 210, 234 press the lasting margin against the bottom of the toe wipers 414. At the end of the descent of the wiper head 358 the toe gripper 176 opens and moves down, the side clamps 466 move inwardly to clamp the upper, the side retarders 234 exert increased pressure and the side grippers 324 ope