Patent GB-474451-A (GB)
Title: Improvements in or relating to machines for causing relative movement between shoes and lasts
IPC: A43D3/10
Filed: 1936-04-01
Abstract: 474,451. Removing shoes &c. from lasts. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation) April 1, 1936, No. 9598. [Class 17 (i)] A machine for separating a shoe from a last comprises a support for the last and a pad, operated by a treadle, and arranged to frictionally engage the rear portion of the shoe and to exert thereon an upward and forward force to remove it from the last. The frame of the machine consists of a base 16, a column 18 and a head 20. A last pin 10 is mounted in a bracket 22, which in turn is mounted for vertical adjustment in the head 20 and is secured in position by a bolt 24 passing through a vertical slot in the bracket 22. The pad 12 is of rubber moulded over a brass core 28, Fig. 4, which is secured to a slide 30. A flange 36, integral with the slide 30, extends into a guideway 34 formed in a U-shaped frame 32. A cover plate 40 retains the flange 36 in position in the guideway, the slide being otherwise free to centre itself relatively to the shoe and being yieldingly maintained in a central position when not in contact with the shoe, by two opposed spring-pressed plungers 38, Fig. 3. The U-shaped frame is pivoted at 42 to the ends of two L-shaped levers 44 and is supported at the other end by a screw 88 and an abutment 90 resting on a table 102. The screw 88 is threaded through a lug on the end of the U-shaped member and is prevented from accidental rotation by a spring-pressed plunger 108, Fig. 4, which engages longitudinal grooves 106 in the screw. A ball 92, formed on the lower end of the screw, fits into a recess 94 in the abutment 90 and is retained therein by a pair of screws 96. The under surface of the abutment is padded with a disc of leather 98 which in turn is covered with a disc 100 of fibre composition. The levers 44 turn about a pivot 46 on the machine head, but are limited in their movement by screws 56 and 60 and abutments 58 and 62 respectively. By means of a treadle 80, a rod 76, a yoke-shaped lever 70, and push rods 66, an upward and forward force can be exerted at 64 on the U-shaped member. A spring 84 secured at one end to the base of the machine and at the other end to the lever 70 tends to keep the treadle in its raised position. When the last has been placed on the pin, the treadle is at first lightly pressed. The U-shaped member 32 moves forward until the pad presses against the end of the shoe, the levers 44 rotating about the pivots 46. Further pressure on the treadle turns the U-shaped member about the pivots 42, raises the abutment 90 from the table, and by means of the pad 12 removes the heel end of the shoe from the last. The U -shaped member continues to rotate and to move forward until the screw 60 meets the abutment 62, and until a screw 112 on the U-shaped member engages an abutment 116 on one of the levers 44. The U-shaped member and the levers 44 are retained in their limiting relative positions by catches consisting of spring-pressed plungers 124 in each of the levers 44, which engage grooves 120 with bevelled sides in the U-shaped member. The removal of the shoe is then completed by hand. When the treadle is released, the spring 84 rotates the levers 44 until they are stopped by the screw 56 and the abutment 58, whereupon the catches are forced to release the U-shaped member which is then lowered until the abutment 90 engages the table. The last is then removed and the machine is ready for another operation. The retention of the levers 44 and the U-shaped member in their limiting positions by the catch members allows the pad 12 to clear the last as the machine returns to the starting position.