Patent GB-747019-A (GB)
Title: Improvements in or relating to shoe bottom pressing machines
IPC: A43D95/02
Filed: 1953-04-07
Abstract: 747,019. Shoe bottom pressing machine. BRITISH UNITED SHOE MACHINERY CO., Ltd., (United Shoe Machinery Corporation). April 6, 1954 [April 7, 1953], No. 9322/53. Class 17 (1). A shoe bottom pressing machine, for applying pressure simultaneously to the heel seat and to the overlasted margins of upper along the shank, has a device 24 to press the heel seat, two sets of auxiliary devices 28, 30, each arranged to press the overlasted margin at one side only of the shank, the two sets of devices 28, 30 being pivotally connected to the device 24, and one or more of the following features: (1) an arrangement such that on the commencement of the operation pressure is developed between the heel seat and device 24 and through a system of equalizing levers connecting device 24 to devices 28, 30, causes the latter to press against the overlasted upper margin ; (2) means to cause the devices 28, 30 to move relatively to each other and to devices 24 during the pressing operation to cause the devices 24, 28, 30 to conform to the shape of the heel seat and shank part of the shoe; and (3) fluid pressure means to press the shoe against devices 24, 28, 30, and means responsive thereto to cause the operative surfaces 26, 32, 34, of the devices to form a substantially continuous work-engaging surface. Devices 24, 28, 30 are heated by thermostatically controlled units 150, 152, 154. The seat ironing block 24 is pivoted to the frame at 36, blocks 28 are hinged to block 24 by means of integral trunnions 40 journalled in recesses 42, being retained by screws 44, and blocks 30 are hinged to blocks 28 by integral trunnions 46 (not shown), journalled in bores 48 and held by screws 50. Equalizing levers 54 pivoted at 52 engage at one end the opposite ends of lever 56 pivoted to block 24, and levers 62 pivoted on the other end of levers 54 have adjustable abutment screws 64, 66, which bear on blocks 28, 30. Blocks 24, 28, 30 are normally held in the position shown in Fig. 1 by springs 70, 72, 74. The fluid pressure means comprises a piston 80 with a rod 90 and plunger 84 mounted in a cylinder 82 which is bolted to a table 86 movable on rollers 88. Check valve 106 in the piston permits the flow of fluid downwardly but not upwardly. Spring 108 normally holds the piston in the lowered position. Conduits 100, 102, 114 are connected by valves to a source of fluid under pressure or to exhaust. Block 126 carrying the last pin has an arcuate side 128 slidable, i.e. about a transverse axis, in an arcuate recess 124 in a member 122 which is pivotally mounted about a longitudinal axis on a bracket 120 supported on rod 90. Sliding movement of block 126 is limited by a pin 130 on block 122 engaged in a slot in block 126. In operation, the shoe is placed on block 126 and fluid admitted through conduit 100 to act on plunger 84 to raise the piston &c. The operator positions the shoe in a lengthwise direction by means of rollers 88 and if necessary rocks it to align the heel seat and shank with surfaces 26, 32, 34. Fluid under pressure is then admitted through conduit 102 to press the seat and shank firmly against surfaces 26, 32, 34 under the relatively high pressure provided by piston 80. Conduits 100, 102 are then connected to exhaust, and as the piston is returned by spring 108 the shoe falls into receiving trough 140. Fluid enters through conduit 110 to maintain the level determined by outlet 112. Surface 26 is slightly concave and surfaces 32, 34 substantially continuous therewith, and springs 70, 72, 74 are such as to swing blocks 28, 30 relatively to block 24 so that initially surface 26 is substantially horizontal and surfaces 32, 34 more sharply curved than the steepest shank. Under the pressure of plunger 84 the ironing unit rotates slightly so that surface 26 is flat on the heel seat, and surfaces 32, 34 conform to but are slightly spaced from the shank. In the pressing position the pivotal axis of block 126 is offset, both left in Fig. 1, from the axis of shaft 36, therefore when the higher pressure is applied, block 24 swings and through the equalizing levers swings blocks 28, 30 clockwise to conform with the shank. Recesses 42 as they extend inwardly slope upwardly and rearwardly so that blocks 28, 30 engage the sloping shank more effectively, have a slight wiping action when they move towards each other as a result of their clockwise movement, and may provide a wedging action which also wipes the margins inwardly. Specifications 523,664, 608,176 and 630,407 are referred to.