Patent GB-628708-A (GB)
Title: Improvements in or relating to machines for operating on platform covers of platformshoes
IPC: A43D85/00
Filed: 1947-10-04
Abstract: 628,708. Turning covers of platform shoes. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Oct. 4, 1947, No. 26756. Addition to 605,151. [Class 17 (i)] The machine described in the parent Specification for turning the covers C of platform shoes is improved in various details. (1) A safety device is provided to prevent the machine from being started unless the plunger 14, Fig. 1, and one of the two U-shaped turning tools 10, 12 are in correct relative positions for the turning operation ; (2) the turning tools 10, 12 are mounted on a sector shaped pivoted carrier 142 movable to bring either into operative relation to the plunger 14; (3) the arm supports for the arms of the tools are adjustable to vary the shape of the tools ; (4) a friction tool 18 which engages the outer face of the unturned cover C- during the turning operation is provided. The safety device takes the form of a safety lever 342 which is held up in a stop position in which the driving clutch is held disengaged by a spring 348 but which may be depressed when one or other of two notches 356 on an arcuate surface 354 on periphery of sector 142 registers with it, i.e. when either the tool 10 or 12 is in its operating position. Slides 172, 178 (not shown), to which the right and left hand base portions 166 of the tool 10 are attached are adjustable along guide ways angularly disposed to one another at approximately 180 degrees so that, by swinging a lever 188 about its pivot 190 the slides may be brought closer together to make the tool 10 smaller to fit a smaller shoe, the tool being held in adjusted position by a pawl 200 and ratchet bar 198. The most rearward point of the work engaging portion of the tool is not moved when the tool is adjusted for size. The pawl is released from its ratchet by the operator by squeezing a hand grip 206 as lever 188 is grasped in making a desired adjustment of the tool size. The toe turning tool 12 is generally similar to the tool 10 and may be adjusted simultaneously with it by means of a three-armed lever 228, an arm 232 of which has a rounded end which engages a notch in an extension 234 of lever 188. A shoe pushing tool 16 for pushing the shoe forwardly during the cover turning operation is provided, as in the parent Specification, and the friction tool 18 is secured to its shank 61. It has a concave work engaging face with upwardly directed teeth, and is pivoted on a pin 106 carried by a lever 108 an abutment 118 of which is engaged by a dog 122 pivoted on lever 38 to raise the tool 18 as the lever 38 descends with the plunger 14. A spring 110 retracts the tool 18 by disengaging dog 122 from abutment 118. A roll 130 holds the tool against the work until it (the tool) has risen to a point at which the lowest tooth on its operating face is in engagement with the platform cover C when a ridge 132 rides off the roll 130. In operation, the starting handle 302 is depressed to start the power operation and, providing one or other of the tools 10, 12 is in correct operating position, the lever 38 is caused to descend to bring the plunger 14 into contact with the shoe bottom and to push one end of the shoe down inside the appropriate tool, and urge the shoe forwards. This latter is assisted by the tool 16 which is moved forwards under action of a cam 60 against a roll 98. A spring 90 holds the tool 16 yieldingly in a stop position. The tool is adjustable forwardly and rearwardly in accordance with the stiffness of the platform cover, and may be readily adjusted to an inoperative position or removed, if not required. The clutch is controlled by the pressure of the operator on the handle 302 and may be permitted to slip or to be disengaged as conditions of the work require. When the clutch is disengaged, the power driven members are restored to their initial positions by springs 294.