Patent GB-737786-A (GB)
Title: Improvements in or relating to machines for shaping shoe uppers
IPC: A43D113/00
Filed: 1952-08-07
Abstract: 737,786. Moulding heel portions of veldt-schoen uppers. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Aug. 6, 1953 [Aug. 7, 1952], No. 19876/52. Class 17 (1). A machine for moulding and outflanging seat portions of veldtschoen uppers has an inner seat mould 24 co-operating with a pair of outer seat moulds 26, a pair of flange forming members 28 co-operating with the outer moulds to outflange a seat end marginal portion of the upper, hydraulic means responsive to relatively light forces applied to the workpiece by the outer moulds to cause these moulds to press more heavily against the workpiece, and hydraulic means responsive to this heavier pressure to actuate the flange forming members. The different actions of the outer moulds and flange formers are brought about by the automatic and sequential opening of different valves. Ina two-station machine the hydraulic means are controlled automatically so that operative movements of the outer moulds and flange formers at one station involve return movements to inoperative position of the corresponding parts at the other station. The machine illustrated is similar to that described in Specification 567,681. Each station includes a cylinder 58 with a hollow piston 44 which is operated by fluid through 274,306 to move the outer moulds into engagement with the upper, then through 292,296 to press the moulds against the upper, and through 294,298 to retract the moulds, a cylinder 80 with a piston 76, 78 which is operated by fluid through 286,288 to move the flange formers outwardly and rearwardly to perform the out-wiping action, and through 300,302 for closing, i.e. retracting, the flange formers, a cylinder 102 with a piston rod 100 and piston 106 which is operated by fluid through 288,286 to move the flange formers to press the flange, i.e. perpendicularly to the plane of wiping, and by springs 114 to retract the formers, and five sequence valves 250, 266, 268, 270, 272. Each sequence valve comprises upper and lower chambers 252, 254 connected by a vertical passage which is opened or closed by a spool 256 slidable therein, a smaller opening 258 normally closed by a spring-pressed valve 260, and a duct 261 connecting chamber 254 with the bottom of the passage. A spring 262, adjustable by a screw 264, normally holds the spool to close the passage. Thus fluid entering chamber 252 can pass to chamber 254, through 258, but reverse flow is prevented until the pressure of the fluid is sufficient to overcome the spring. The valves are set to operate individually at different predetermined pressures to operate the outer moulds and flange formers at the desired pressures and in desired sequence, this sequence of operations being fully described. The machine also includes a pressure fluid pump 144 driven by a motor 142, a sump 150, supply pipe 152, a safety valve 154 controlled by hand wheel 156, filter 160, a quick release valve 280 with a fluid operated spool 284, and a main control valve 162. The latter contains a spool 166 which is reciprocated to operate the left station and make the right station inoperative, or vice versa, through 208 or 209, 186, 190, 196 by energization of solenoid 206 or 204. To accomplish this the operator depresses the button 224 of the common switch box 218 with one hand, and with the other hand operates the plate 226 of switch box 222 or 220 located at the front of the left- and right-hand stations respectively to thus energize relay coil 234 or 240 so that solenoid 206 or 204 is energized through contact 236 or 242. To prevent damage to the upper by the flange formers when the upper is thicker than normal the piston 106 is constructed to then yield automatically, permitting the formers to yield away from the outer mould. For this' purpose, and to position the piston initially in a predetermined position heightwise of the cylinder, a positioning member 116 is mounted in cylinder 102 and adjusted longitudinally thereof by means of a threaded portion of rod 132 and locking nuts 140, 136. An inverted spring retaining cup 124 is mounted in a groove 122 surrounding a central projection 120 on member 116 and retained by pins 126 in the latter extending into slots in the lower end of the cup. In the normal position, as at the right-hand station in Fig. 5, spring 128, between the projection 120 and the cup, forces the cup to its highest position, determined by pins 126, piston rod 100 is supported by cup 124, and springs 114 hold piston 106 and rod 100 in their lower position. Piston 106, with the flange formers, can yield, when required, through the compression of spring 128. Flange 130 on cup 124 moves between 104 and 106 and prevents excessive upward movement of the piston and flange formers if no work is in the machine. When piston 44 moves downwardly in cylinder 58 fluid is sucked from an auxiliary sump 180 in valve 162 through pipe 182 and check valve 291 to fill the space above the upper end 62 of the piston. Buffer grooves formed in the periphery of portion 62 slow the movement of the piston near the opposite ends of its stroke. Fluid leaking from cylinders 102 passes via lips 308 and pipes 310 to a pan 312 and hence via petcock 314 to the sump 150. Air or excess fluid is expelled from cylinders 58 through bleeder valves.