Patent GB-1108221-A (GB)
Title: Pulling over and lasting of shoes
IPC: A43D8/04
Filed: 1966-07-01
Abstract: 1,108,221. Boots, &c. J. S. KAMBORIAN. 1 July, 1966 [16 July, 1965], No. 29581/66. Heading A3B. A shoe lasting machine has wipers, a shoe support, mounted for heightwise movement, for supporting the shoe bottom down in the machine, a shoe conforming pad above the wipers and clamps positioned adjacent the pad, the arrangement being such that as the shoe support is raised the pad bears against the shoe upper under light pressure, when the shoe reaches its uppermost position the pad applies heavy pressure and the clamps are operated to clamp the upper against the last and thereafter the wipers perform their wiping operation. As described the machine is a toe lasting machine having a shoe support, an adhesive applicator 120, a toe gripper 286, two side grippers 432, a toe retarder 320, two side retarders 344, a heel clamp 486, a toe hold down 578, wipers 620 a toe pad 698 and side clamps 738. The shoe support, adhesive applicator 120, grippers 286, 432, and retarders 320, 344 are all carried on a toe post 20 which is slidable in a sleeve 14 (Fig. 1) and is moved heightwise by an air motor 16. The toe post 20 carries at its upper end a toe post extension 44 (Fig. 6) having guides for a slide 46 which is adjustable heightwise in the extension 44 by a screw 54 and nut 52. Pivoted on a pin 56 at the top of the slide 46 are two side insole rests 70 and a toe insole rest 64 on which the shoe is supported during the lasting operation. Supported on a second slide 98 in the toe post extension 44 is a support 100 on which is yieldably mounted, by means of compression springs 106, an adhesive applicator 120. The slide 98 and applicator 120 can be lowered to an inoperative position by a toggle 94, 96 operated by air motor 88. The adhesive applicator 120 has a channel 126 on its upper surface which is supplied with molten thermoplastic adhesive by a single stroke pump (not shown) via conduits 128, 136, 134, 141 and a flexible pipe 144 heated by electrical element 150. The applicator 120 is itself heated by a heating element 148. The adhesive pump is supplied with molten thermoplastic adhesive from a melting pot 160 (Fig. 1) and is driven by an air motor (186). The pump can also be operated manually by a handle 194 to prime the applicator 120 at the start of a machine cycle. Mounted on a bracket 84 (Figs. 6, 16) on the toe post extension 44 is a housing 254 carrying the toe retarder 320 and toe gripper 286 (Fig. 16). The toe retarder 320 is carried on the upper end of a slide 316 which is movable heightwise by an air motor 304. A second housing 258 is pivoted to the housing 254 and its angular position can be adjusted by a cam 264. Slidable within the housing 258 is a slide 280 which is movable heightwise by an air motor 272 and which carries at its upper end a gripper jaw 282 and at its lower end two air motors 290. The air motors 290 operate a slide 298 having a gripper jaw 302 at its upper end. Operation of the air motors 290 causes the toe gripper 286 to close and operation of the air motor 272 causes the toe gripper 286 to be lowered to tension the upper. Also carried by the bracket 84 are the side retarders 344 (Fig. 20). The retarders 344 are mounted on blocks 342 which can be moved heightwise by air motors 336. The motors 336 are mounted in housing 326 which are slidable on guides 322 and which can be adjusted widthwise of the shoe by screws 330. The side grippers 432 (Fig. 28A) have jaws 436, 438 which are closed by the pointed end 448 of the piston rod 450 of an air motor 426. The grippers 432 are lowered to tension the upper by the piston rod 424 of an air motor 406. The side grippers 432 are mounted on a plate 354 (Fig. 6) on the toe post which can be adjusted heightwise by a screw 360 and nut 362. The air motor 406 is mounted on the plate 354 by a universal coupling (not shown) to allow the side grippers to swing lengthwise and widthwise of the shoe, the idle position of the motor being determined by two adjustable stops (not shown). The universal coupling can be moved lengthwise of the plate 354 and can be rotated about the axis of the motor 406 to adjust the position of the gripper jaws 432. The heel clamp 486 (Figs. 1, 29) is carried on rods 462 which can slide lengthwise of the shoe in guides 464, 465. The heel clamp is moved towards the shoe by an air motor 454. The heel clamp 486 can be locked in position by brakes 494 which bear against the rods 462 under the action of an air motor (516) The toe hold down 578, wipers 620, toe  pad 698 and side clamps 738 are all carried by a main side plate 546 which is movable between a rearward inoperative position and a forward operative position by an air  motor 520 (Fig. 41) which is connected (to the slide plate via a rack 426 and pinion, a crank arm and a link 540. The toe hold down 578 ((Fig. 29) is  carried by one arm 574 of a lever 572 which is pivoted to the slide plate 546 at 570. The hold down 578 is raised and lowered by an air motor 582 connected to the other arm 576 of the lever 572. The wipers .620 (Fig. 41) are carried by cam plates 608 having cam grooves (614 which co-operate with rollers 612 on the forward end 610 of the slide plate 546. The wipers 620 are moved forwardly and inwardly to perform their wiping operation by an air motor 588 which is connected to the wiper cam plates 608 via an adjustable slide block 594, 598 and a pair of links 618. A cutting blade 636 housed in grooves in the wipers 620 is connected to the cam plates by a pair of links so that near the completion of the wiping operation the blade advances with respect to the wipers 620 and emerges from the vertex 624 of the wipers 620 to trim the toe end of the lasting margin. The toe pad 698 and side clamps 738 (Fig. 47) are carried by a cover plate 654 mounted on the main slide plate 546 above the wipers 620. The toe pad 698 which may be of P.T.F.E. is carried at its forward end 750 by a block 712 which can move lengthwise of the shoe against a spring 714 and is carried at its forward ends by brackets 758 which can move widthwise of the shoe against springs 748 by a limited amount determined by pin and slot connections between the brackets 758 and rods 732. The springs 714, 748 together with backing springs 754, 764 urge the toe band against the shoe under relatively light pressure. The rods 732 are mounted on the cylinders 728 of air motors 724 and carry the side clamps 738 at their inner ends. When the air motors 724 are actuated the clamps 738 are pressed against the shoe and the toe band is urged against the shoe under relatively high pressure. The machine has an automatic pneumatic control circuit which operates as follows: after adjusting the various parts to the size and style of the shoe and after priming the adhesive applicator, the operator places the upper and last in the machine, places the lasting margin in the toe gripper 286 and side grippers 432 and depresses a pedal 774 (Fig. 1) which causes the toe gripper 286 to close. The operator may release the pedal if not satisfied with the operation. On further depression of the pedal the side grippers 432 close and both the toe and side grippers descend to tension the upper and the machine stops. Again the operator may release the pedal if not satisfied with the operation. On still further depression of the pedal the pedal is held depressed by an air motor (824) and the slide plate 546 carrying the wipers 620, hold down 578, toe pad 698 and side clamps 738 moves forward to its operative position above the shoe. The hold down 578 is then lowered under relatively low pressure, cement is extruded on to the bottom of the insole by the adhesive applicator 120 and the toe post 20 is raised until the bottom of the insole is slightly above the level of the wipers 620 when the toe post 20 is stopped by lugs (not shown) on the machine frame. At this point the retarders 320, 344 press the lasting margin against the bottom surface of the wipers 620 and the toe pad 698 is urged against the shoe under the relatively low pressure of the springs 714, 748, 754 and 764. The toe gripper 286 is then opened to release the upper and descends to an out of the way position, the heel clamp 486 moves against the shoe and is locked in position, the air motors 724 are actuated to apply the side clamps 738 and urge the toe band 698 against the shoe under relatively high pressure and the side retarders 344 are forced upwardly under relatively high pressure. The side pincers 432 then open and descend to an out of the way position and the wipers 620 begin their wiping movement. During the initial part of this movement the adhesive applicator 120 and the side retarders 344 are lowered out of the way of the wipers 620 and towards the final part of this movement the insole rests 64, 70 are lowered leaving the shoe supported on the wipers 620, the knife 636 advances to trim the toe end of the lasting margin and the hold down 578 applies heavy bedding pressure. After a predetermined time lapse the various parts then return to their initial positions to complete the machine cycle.