Patent GB-613393-A (GB)
Title: Improvements in or relating to machines for performing lasting or analogous operations on shoe parts
IPC: A43D21/18
Filed: 1946-06-20
Abstract: 613,393. Lasting-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. June 20, 1946, No. 18518. Convention date, July 2, 1945. Addition to 598,216. [Class 17 (i)] The machine of the parent Specification is modified (1) to reduce the frictional drag of the cement-coated lasting margin of a shoe upper, or of a cover of a platform of a slip-in lasted shoe, over the protective shield portion 170 of the shoe bottom rest 14 by providing the rest with a rotary member 320 mounted adjacent to the shield portion, and also (2) to reduce the effort required by the operator to actuate the bottom rest 14 and to hold the front gripper jaw 12 in its inoperative position. The rotary member 320 is preferably in the form of a spindle driven at relatively high speed, through gears 328, 330 and shaft 336 with universal joints, from the main shaft 52, so that its surface moves faster than the linear speed of the stock, so that it may, in addition to reducing friction between the upper stock and the shield portion 170 exert a frictional drag on the stock heightwise of the shoe and supplement the pull of the gripper jaws 10, 12. The spindle 320 has a slender tapered lower end 322 which is inclined downwardly and inwardly and lengthwise of the machine and lies close against the inwardly and downwardly inclined surface of the bottom rest 14 with its lower end preferably a little beyond the edge of the shoe bottom. It thus tends to displace the upper stock from the edge of the shoe bottom if it has become accidentally attached to it. The shoe bottom rest 14 is movable between operative and inoperative positions through a toggle comprising a link 186 and arm 188 which is straightened by depression of a treadle (not shown) controlled by the operator against a relatively weak spring (not shown) to bring a stop 191 on the hub of a lever 194 into engagement with a pin 195. The spring breaks the toggle 186, 188, by moving the link 186 upwards through a link 196, when the treadle is released, to swing an arm 174 in a clockwise direction and move the rest 14 outwardly to inoperative position. Means for holding the front gripper jaw 12 in inoperative position away from the rear gripper jaw 10 to facilitate introduction of the work, and comprising a projection 199 on an arm 197 in line with a stop 200 on the rod 102 on which the jaw 12 is mounted, are also actuated through the toggle to swing an arm 152, to which one end of the gripper closing spring 150 is anchored, in a clockwise direction to relieve the tension of such spring. The closing pressure of the gripper jaws 10, 12 on the upper stock may be varied by shifting the position of a plunger 158 in a series of holes 160 formed in the upper end of an arm 162 secured to hub 161 on a shaft 154 on which the arm 152 to which one end of the spring 150 which closes the gripper jaws on the stock is anchored. A presser feed foot 16 is secured to outer end of a lever 242 which is oscillated by an eccentric carried by the shaft 52 to move the foot against the stock. A shaft 246 is oscillated to move the foot back and forth lengthwise of the shoe by an angle crank (not shown) on shaft 52. A feed-retaining member 18 constructed and operated as in the parent Specification is also provided.