Patent GB-461209-A (GB)
Title: Improvements in or relating to shoe-upper conforming machines
IPC: A43D21/12
Filed: 1935-08-13
Abstract: 461,209. Boot - making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., ROBERTS, W. T. B., and KEALL, F. B. Aug. 13, 1935, No. 474/37. Divided out of 461,326 and addition to 423,026. [Class 17 (i)] Lasting.-The jack described in Specification 423,026 is modified (1) to allow clearance for the upper of a high-legged boot, (2) by supporting it on a rocking linkage to move lengthwise of the shoe, and (3) by means for urging the shoe supports against the shoe first yieldingly, and then positively. As in the prior Specification the wipers 5 are mounted in a carriage at the upper end of a trunk 3 connected with a treadle 19 by which the wipers may be raised and lowered. The lower part of the jack is off-set rearwardly to allow high-legged boots to be operated on. The toe end support comprises a rubber pad 403 free to rock both laterally and longitudinally of the shoe on a stem 423 adjustable longitudinally of the shoe by a screw 427 provided with a hand wheel. The toe rest is raised and lowered by a lever pivoted at 439 and actuating a slide 443 guided on a link 447 and urged downwardly by springs 451. The link 447 is pivoted to a floating lever 459 similar to that described in the prior Specification and pivoted at 461 to a three armed lever 465 pivoted at 467 to the jack casting. This lever has an arm 471 connected by a link 473 connected by arms 475 with a gear segment 479 meshing with a segment 481 swung by a handle 483. A heel end abutment 405 is pivoted to a link 489 pivoted to a slide 493 engaging a vertical guideway at the end of a slide 497. A spring plunger with rack teeth retains the slide 493 in adjusted position. The tilt of the heel abutment is adjusted by a screw 507. The abutment may rock about its length against spring plungers which tend to centralize it. The right-hand end of the floating lever 459 is linked to a lever 535, 539 linked to the pivot 525 of a pair of links 521 secured to a crank handle held in either of two positions by a spring plunger engaging either of two holes 531. This construction permits quick adjustment of the starting position of the heel abutment, according as to whether a long shoe or a short shoe is to be operated on, to one of two positions differing in their distance from the toe support by twice the length of the links 521. The heel abutment is retained in operative position by pawls 545 engaging teeth 543 and released automatically as the jack is moved to operative position, a pin 555 carried by the jack handle engaging a lever co-operating with the tails of the pawls. The shoe is clamped in operative position by the links 473, 475 which form a straightened toggle when the jack handle has been brought to operative position against a stop. In order that a positive thrust may be given to the shoe supports at the end of their movement, to hold the shoe firmly, means are provided to substitute a positive connection for the springs 451. The link 447 carries pawls 563 having teeth co-operating with teeth on the slide 443 and urged to operative position by springs 581 normally overcome by stronger springs 575. The link 473 carries a roll 587 which, as the jack approaches operative position, engages the head of a screw 583 compressing the latter springs and allowing the former springs to move the teeth into engagement. The jack casting is pivoted at the left on a vertical rod 589 for transverse swing, and is supported at the right by a roll 603 engaging a rail. The jack carriage is supported by parallel links 595, 607, 659, the first two being connected by a link 613. Another parallel link 617, Fig. 1, is connected with the link 595 by a pair of links 615, one on each side of the trunk 3, the upper end of the link 617 carrying a trunnion engaging an adjusting rod 623 provided with a hand wheel 625, restrained from endwise movement through the trunnion and screwing into a socket 630 pivoted to a bell-crank lever 635 pivoted to the frame and engaging a stop 643 to determine the inoperative position of the jack. The lever 465 has an arm 645 linked to a bell-crank lever 649, 655 connected by a link 657 to the lever 635 so that as the shoe is clamped the jack moves to operative position. A knee operated jack release device 669, actuates a plunger 677 co-operating with a finger on the sector 479 to break the toggle 473, 475. The forward link 615 has a pair of coil springs 681, 683 threaded on it separated by a lug 689 on the frame. These springs give an impulse to assist the operator at each movement of the jack. In a modification, the jack release mechanism is operated by a knee lever, the pivot of which is relatively stationary with regard to the machine.