Patent GB-564547-A (GB)
Title: Improvements in or relating to shoe-bottom pressing apparatus or devices for use in the same
IPC: A43D25/07
Filed: 1942-12-12
Abstract: 564,547. Sole-laying machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Dec. 12, 1942, No. 17686. [Class 17 (i)] [Also in Group XXIX] A sole-laying machine comprises a distensible shoe bottom pressing pad, gauge devices adapted to locate a sole centrally relatively to the pad and to locate a shoe relatively to the sole, means to press the shoe and sole together on the pad, an arrangement for automatically distending the pad, arranged to be actuated after a predetermined pressure has been applied to the work and means to release the pressure and collapse the pad after the shoe has been subjected to pressure for a predetermined time. The machine is duplex. Each half has a single operating treadle the first depression of which causes the gauges to be moved to operative position : a second depression causes the gauges to be released and fluid-operated mechanism actuated to force the shoe against the pad to force water into the pad. The pad box comprises a heel end portion 48, Fig. 5, linked to upstanding struts 56 and supported by a five-sided cam 58 adjusted by a hand wheel 64 for heels of different heights. The shank portion 46 of the pad-box is pivoted to the heel end portion at 52 and is adjusted by a wedge 66 traversed by a hand wheel 70. The fore part of the box is pivoted at 50 to the shank part and also pivoted on struts 74. In the bottom of the box is a distensible bag 100, Fig. 3, above which is a mask plate adjustable lengthwise of the pad and a thick rubber pad 142. The mask plate carried a pin 134, Fig. 7, to indicate its adjustment on a scale 132 on a cover plate 162 provided with upstanding ribs 180 which guide shoe and sole gauges at the ends of the ball line. Each sole gauge is connected to an arm 188, Fig. 8, secured to one of a pair of segments 196, 198 geared together and urged to operative position by a spring 212. A pin 218 on one of the segments engages an inclined slot in a slide 224, which moves endwise to permit the gauges to move towards the work and locks them when the slide is stationary. The gauges for the toe end are similar to those described in Specification 540,890, sole gauges 260, 262, Fig. 7, and a shoe gauge 268 constituting V-gauges for the toe end, an opening 272 being provided for inspection of the relative position of shoe and sole. The gauges are adjustable on a sliding plate 290 having substantial floating movement laterally of the pad. Thumb screws 338 permit adjustment of the shoe gauges relatively to the sole gauges at the ball line. The gauge arm 188 has a downward extension actuating a slide 358, Fig. 8, carrying plates 361 engaging a bar 362 formed with a slot 370 through which extends a fulcrum pin 380 adjustable lengthwise of the pad. The bar carries a pin actuating a slide 396 moving with a breast line gauge 422, Fig. 7, for the outer side of the sole. The corresponding gauge for the inner side is adjustable between up-standing ears 436 carried by an arm 442 pivoted at 448 and yieldingly connected to a segment arm 446 geared to a lever 454 linked to the slide 396. A V-gauge 474 for the rear end of the shoe is adjustable along a guide 468 curved about a centro at the intersection of median lines of fore part and heel part of a sole,placed on the pad. The gauge is slidable longitudinally of the pad on depression of a finger-piece 492 on a lever carrying a pawl 494, Fig. 5, engaging teeth. The pawl is released when work is to be changed by a handle 498. The gauges are urged to operative positions by springs and normally retained in retracted positions by connections actuated by a bar 252, Fig. 30. This bar is depressed by fluid pressure admitted to a cylinder 540 on actuation of a treadle 522 to allow the sole gauges to advance and centre the sole on the pad and the shoe gauges to position the shoe correctly relatively to the sole. When this has been done a pressing head 618, Fig. 2, is pulled rearwardly about its pivot 642 by its handle 634, which is turned to adjust the distance of the toe-pad 622, from the heel-end abutment 620. As the supporting links 640 are moved forwardly a roll 646 thereon rides along a surface 648 until the roll reaches a slot 650, when the head is depressed, against the pull of springs 668, Fig. 3, by oil pumped into cylinders housing plungers 676. As the side bar 640 swings forwardly it engages a roll 810, Fig. 2, connected to valve operating mechanism admitting fluid to these plungers 676, which abut against a cross-head 644 to which are secured the links 640 and a strut 684, Fig. 3, grooved to receive a wedge surface on a slide 700 forced rearwardly into locking relation with the strut when the head has been fully depressed. To distend the pad 100 oil is admitted below a piston 724, Fig. 30, secured to a second piston 722 above which is water forced by the rise of the piston into the pad 100. Alternatively, an oil operated piston may engage a flexible bag containing water, to deform the bag and cause expelled liquid to enter the pad. When the treadle 522 is released after its first depression, the cylinder 540 is opened to exhaust. The lever 532 is thus moved clockwise and a bolt carried thereby is moved to overlie a latch 848 in a lever 844 urged clockwise by a spring 846. On the next depression of the treadle the lever 844 is turned anti-clockwise and actuates a lever 866 linked to valves 874, 876, means being provided to delay actuation of the second valve. The first valve supplies fluid to a piston actuating mechanism releasing the gauges, while the second valve supplies fluid to the piston 724, for distending the pad and also depresses a gear sector 956 into mesh with a constantly driven worm, the sector having a pin 968 which, after a predetermined time, releases a latch 966 which has previously engaged the lever 866 to hold the valves 874, 876 open. When the latch is released the pad 100 is collapsed, the wedge 696 is withdrawn and the pressure on the plungers 676 released. The starting position of the segments is adjustable so that the time the work is under pressure is predetermined. Preferably, the oil controlled by the valve 874 is at higher pressure than that controlled by the valve 876. Suitable pressure regulating valves . are described in Specification 408,953. Alternatively, oil at high pressure may enter a valve at 1016, Fig. 14, and leave to provide the lower pressure at 1018. The valve has a piston 1024 with a skirt 1034, lugs 1044 and 1046, Fig. 22, and lateral slots 1052. These slots open into vertical slots 1042 in a sleeve within the piston, the slots 1042 being tapered and widest at their lower ends, so that as the piston is forced down against a spring 1040, the size of the passages is increased. The sleeve is adjusted by a screw 1038.