Patent GB-682021-A (GB)
Title: Improvements in or relating to machines for performing lasting or analogous operations upon shoe parts
IPC: A43D21/02
Filed: 1950-05-20
Abstract: 682,021. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., FREER, C. H., and SMITH, F. R. May 21, 1951 [May 20, 1950], No. 12674/50. Class 17 (i). A machine for this purpose of the kind described in Specification 598,216, i.e. one having means for engaging a shoe bottom near its marginal edge, means for seizing and pulling the lasting margin of the stock inwardly over the shoe bottom, and means, operating in time relation to the pulling means and having a four motion feed, for pressing the adhesive coated margin against the shoe bottom and moving the work through the machine, has (1) improved means for controlling the path of movement of the gripper which pulls the stock and (2) the presentation of shoe to machine facilitated by modifying the movements of the presser feed and feed-retaining members between successive operations. The invention is described as applied to the machine of Specification 598,216, which has a rapidly reciprocating gripper moving in a path substantially parallel to the shoe bottom, but modified as described in Specification 648,073, i.e. with a heightwise component of movement. A presser feed member 16 presses the lasting margin against the shoe bottom and a feed retaining member 18 restrains the work against back feed on return movement of the member 16, both being moved in time relation to the gripper as in the earlier Specification. An edge gauge roll 20 positions the shoe longitudinally relatively to the gripper and the members 16, 18. A rotary spindle 14, journalled in a block 23 adjustable heightwise on an arm 25, positions the shoe heightwise as described in Specification 671,949, the mounting of the spindle being modified so that, on depression'of an operating treadle which controls the machine, it is brought from an angularly tilted position into its vertical operative-position to locate the work. The member 16 is restrained from engaging the work when a shoe is being presented to the machine, being in its raised position until the operating treadle is depressed; likewise the member 18, due to engagement of an arm 107 on arm 93 on shaft 39 with a pin 105 on an arm 101, cam face 99 on which is engaged by a roll 97 on arm 77 of a threearmed lever 73, 75, 77 on a shaft 79 on machine frame. The arm 93 is operated by the treadle and allows the members 16, 18 to become operative. The front gripper jaw 12 is held in inoperative position for the introduction of stock to the machine until the treadle is depressed. The carrier 32 for the rear jaw of the gripper 10 is operated by an eccentric 37 when the treadle is depressed, at first to give it forward movement, to co-operate with the front jaw which is controlled by a rod 103 and a cam lever 116 as described in Specification 598,216. This latter jaw is moved rearwards by action of cam surface 124 on the lever 116 and a roll 134 on an arm 136 controlled by an eccentric 37 to grip the work. The jaws then move forwardly under action of the eccentric 37 to their most forward position in which the front jaw is held stationary for a while and the rear jaw moves rearwardly to release the stock. A rocker arm 34 is pivoted on a boss 41 freely mounted eccentrically on a shaft 43, and the boss 41 is rocked in time relation to the stock pulling and return movements of the gripper 10, 12 to impart heightwise movements to the gripper away from the shoe bottom during the early part of the pulling movement and to maintain a. constant heightwise position during the return movement due to eccentric boss 41 being stationary, at a height to which the gripper is lowered as the jaws complete their forward movement, by reverse movement of the eccentric boss 41. Specification 613,393 also is referred to.