Patent GB-675040-A (GB)
Title: Improvements in or relating to the filling of shoe bottom cavities
Inventor: GARRATT LESLIE
IPC: A43D25/14
Filed: 1950-01-28
Abstract: 675,040. Shoe-bottom filling machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. Jan. 29, 1951 [Jan. 28, 1950], No. 2297/50. Addition to 611,993. Class 17 (i). Fluid-pressure operated means are provided instead of the clutch devices of the parent Specification, for clamping the shoe with its bottom upwards, against the diaphragm 23, Figs. 3, 6, for introducing filling material, through a duct 37 into the cavity in the shoe bottom, until it is filled, when a by-pass valve 39 is operated to stop the flow, and for unclamping the shoe at the end of the machine cycle, and also for co-ordinating these operations. The fluid-pressure operated means comprises two pumps one, 51, shown in the circuit diagram, Fig. 13, of high capacity, and the other, 53, of low capacity. The former delivers oil to a circuit which includes piston and cylinder devices 181, 185, which reciprocates a plunger 29 and its pick-up sleeve 31 through a mass of conditioned filling material in a drum 11 to separate a quantity therefrom and urge it through a matrix device 21 into the shoe cavity. It may also operate the by-pass valve 39 associated with the matrix device 21. The low capacity pump also delivers oil to the circuit but at a lower rate (about 1/9), the flow of oil in the circuit being controlled by a speed control valve 237 under the control of a treadle 43 (not shown) in such manner that the forward movement of the plunger 29 is, at the commencement, at high speed, when both pumps are feeding the piston and cylinder device 181, 185 which actuates the plunger, and, later, a camactuated lever 431, 433, operated in time relation to the plunger, cuts off the oil supply from the pump 51 so that the forward speed of the plunger is reduced until the filling operation is completed. Depression of the treadle 43 (not shown) moves the stem 275 of the shoe clamping control valve 175 by lever 411 to admit oil to a cylinder 127 between pistons 129, 131 and cause the two levers 431, 433 and 439, 441, to pivot and move the stem 363 of the valve 237 into a position where oil is fed by the pump 51 into the supply line 305 to move pistons 129, 131 and a shoe clamping pad 147 on piston rod 133, under the pressure of oil supplied by both pumps 51, 53 to cause the shoe to be firmly clamped against the diaphragm 23, and the lifting of valve 39 to open the duct 37 through the matrix device 21 to the shoe cavity. This treadle operation also causes a bar 481 to swing a lever 491, 495 and move the stem of a reversing valve 235 into a position in which the forward end of a cylinder 181 communicates with the supply line 305. As the stem 363 of speed control valve 237 moves forward, oil is admitted to cylinder 181, through lever 467, 469, roll 473 and cam disc 475, from both pumps 51, 53, and plunger 29 and sleeve 31 are moved at high speed through the drum 11, until the sleeve engages the rear end of a casting 35, in which the cylinder 33 is formed, and its forward movement is arrested. The continuing movement of the plunger relatively to the sleeve urges the filling material in the sleeve into the cylinder 33 and through duct 37 into the shoe cavity. At about ¥-stroke of plunger 29, a cam 449 on shaft 197, on which cam disc 475 is mounted, causes the lever 439, 441 to pivot and move valve stem 363 to cut off the oil supply from the pump 51 from the pipe line 305 to reduce forward speed of the plunger 29, just before sufficient material has been extruded into the cavity, the capacity of the pick-up-sleeve 31 having been suitably adjusted to somewhat more than that necessary to fill the cavity. On release of treadle 43 when filling operation is observed to be complete, shoe clamping control valve 175 is moved to cause shoe to be unclamped and valve 39 to be lowered to close duct 37, surplus material being returned to the drum 11 via passage 45. Movement of valve 175 operates the tails of pawls, 459 (not shown) which holds stem 363 of the speed control valve 237 to permit a spring 455 to release the stem. Squirting of filling material through the duct 37 as change 'over to high speed occurs is thereby avoided. A stop screw 509 on a segment 503 mounted on shaft 197 engages bar 481 at end of forward stroke of plunger 29 to move it and release a block 493 from a depression 497 in the bar to permit lever 491, 495 to move and allow stem of reversing valve 235 to change over flow of oil from one end of cylinder 181 to the other and return the parts to initial positions. The shoe bottom may be sleeked against a heated roll mounted on a bracket slidably mounted on the machine frame, on removal of shoe from the machine. The cam 449 is angularly adjustable on its shaft 197, two constructions-one fine and the other, coarser-hy which this may be done, are described. In a modified form of machine, the cut-off valve which controls the entry of filling material into the shoe cavity is actuated directly by a pair of treadles, one of which controls the clamping of the shoe and initiates the filling operation and the other operates the cutoff valve to stop the filling operation and then releases the first treadle to effect unclamping and also the change-over from low speed to high speed operation of the plunger. Specification 622,445 also is referred to.