Patent GB-378956-A (GB)
Title: Improvements in or relating to shoe-bottom pressing machine
IPC: A43D25/06
Filed: 1931-05-21
Abstract: 378,956. Boot-making machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. and HAZELTON, G., Union Works, Belgrave Road, Leicester. May 21, 1931, No. 14987. [Class 17 (i).] Sole-laying.-A machine for attaching soles to shoe bottoms with the aid of adhesive comprises a plurality of shoe supporting pads mounted for progression in an endless path to present each pad in turn at a work-assembling station and means near the work assembling station for positioning a shoe and sole relatively to each other on the pad. The machine comprises a stationary axle 7 about which revolve pairs of arms 9 each pair carrying at their outer ends a box 11 in which is an inflatable pad for engaging the shoe bottom. Normally, adjacent pairs of arms are linked together by latches 57. The bottom of each box 11 carries the clamping devices for the shoe on the pad next in front, a p vot 47 carrying a lever 45 having at one end a roughened member 41 for engaging the crown of a last and at the other an abutment for an adjustable screw 53 engaging a pivoted arm carrying a toe pad 43. At the operator's station, to allow work changing, the latches 57 are tripped in turn by a treadle 73 linked to a member 71 pivoted with lost motion to an arm 63 pivoted at 65 and provided with a counterweight 69. The arm 63 has a stop 81 for engaging a stop 79 on the arm 9 and supporting this when the latch is tripped. After work-changing, the assembly is rotated one step by a notched disc 85 engaging a pin 83 on the lowermost arm.. The disc is driven by an electric motor 99 through a swash plate clutch 95 of the kind described in Specification 720C/07, [Class 80, Mechanism &c.], the clutch being freed when the next press has been brought to the operator's position by a lever 105 having a roll dropping into the next of a number of recesses 101 in a disc rotating with the disc 85, the lever actuating the stop mechanism of the clutch. The press at the operator's position lies between shoe and sole positioning means for the fore and heel ends, respectively, of the kind described in Specifications 339,739, [Class 17 (i), Boots and shoes, Apparatus for making &c.], and 366,122. On tripping a treadle 39, carriages 21, 23 approach the pad to bring sole engaging elements 31, 35 into contact with the upper surface of the pad and " find " the sole, after which they come to rest to hold the sole in the position in which it was placed on the pad by the operator. Shoe positioning elements 33, 37 co-operate, as described in the prior Specifications, with the sole engaging means, those at the heel end being released to advance into position by a handlever 38. When the work has been positioned, the treadle 73 is depressed to release the latch 57 of the press above that at the operator's station and bring the clamps 41, 43 which it carries down on the new work-piece, the lower latch 57 engaging automatically. The operator then pushes on a hand-piece 107 to withdraw the positioning mechanism and advance the assembly. This hand-piece is connected to a trip 117 for a second swash plate clutch 109 of the same kind as the first. This clutch, when tripped, drives a disc 123 one revolution, a pin 127 on the disc engaging a slotted link 131 connected by a parallel link mechanism to the treadle 39 to withdraw the positioning means, and engaging a roll 145 to trip the clutch 95. A recess in the disc 123 receives a roll on a lever 155 to stop the clutch 109 after one revolution of the disc. The stationary shaft 7 has compressed air and exhaust ducts, the former supplied at about 40 pounds per square inch on depression of a treadle 207. The ducts open into a frusto-conical valve 171 fixed on the shaft and surrounded by a complementary member 187 provided with pipes 191 each leading to one press pad and having a flexible insertion. The member 187 is connected to one of the arms 9, the arrangement being that each pipe 191 shall connect in turn with an inlet passage 175 for inflation after the work has been positioned, with make-up ports 181 for maintaining the pressure, and with an exhaust port 193 for exhausting each pad before its latch 57 is tripped. To compensate for the extra movement of the valve member 187 when the arm 9 to which it is connected is at the operator's position, the exhaust port 193 is extended to co-operate with an extension on the port connected to this press. Each pipe 191 has a manually operated valve so that its press can be deflated at will. For accelerating the setting of the cement, the machine may be partially enclosed by an arcuate tunnel with gas burners at its lower portion, baffle plates being interposed between the burners and the lower pads.