Patent GB-379884-A (GB)
Title: Improvements in or relating to sole-laying machines
IPC: A43D25/06
Filed: 1931-09-29
Abstract: 379,884. Boot making machines. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Compo Shoe Machinery Corporation; 565, 5th Avenue, New York, U.S.A.) Sept. 29, 1931, No. 27146. [Class 17 (i).] Sole-laying.-Relates to machines of the kind in which an endless conveyer carries a plurality of shoe presses each including an inflatable pressure pad, and consists in means for aligning a fluid pressure supply connection with the inlet valve of each successive press over a part of its range of movement, a reciprocable chuck mounted for limited universal movement adapted to engage the inlet valve for connection with the fluid supply, and improved circuit control means for an electric motor driving the conveyer. The conveyer comprises an endless belt 25 passing over drums 24, at least one of which is driven. The conveyer carries cleats 27 to which are detachably secured by hooks 29 shoe presses 31. The upper run of the conveyer is supported by a transverse plate 26, and the lower run by ledges engaging the ends of the cleats 27. Each shoe press has an inflatable bag 33, an inlet valve 34, an outlet valve 35, and a post 38 to which is pivoted a clamping bridge 39. The bridge carries toe and heel-end engaging members adjustable along the bridge, each having a pin engaging one of a number of notches in the bridge and normally retained in the notch by a spring plunger 53. At its free end the bridge is notched to engage a pin 41 inserted in one of a number of holes in a bail 42 pivoted to the press and formed with an arm 43 for engagement with a cam 79. On the other side of its pivot, the bridge has a roll 45 for engagement with a cam 81. Adjacent the operator's position, a flexible fluid pressure supply pipe 55 is connected to a chuck terminating in a conical mouth adapted to engage with successive inlet valves 34. The chuck is reciprocated by a lever 56 connected to a foot treadle 57, and is supported by radial spring plungers in a head 63 so that it is capable of limited universal movement in engaging the inlet valves. The head 63 is mounted on a slide 66 normally retracted by a spring 67 towards the side from which presses approach. The head has a latch 68 normally in the path of a lug 69 provided on each press. On a lug engaging the latch, press and chuck travel together until the latch is released by a fixed cam 70. As, in this movement, the slide 66 moves with the press, it moves a roll 73 on a switch cutting off current to the motor driving the conveyer, which comes to a definite stop. A second switch is connected to the treadle 57, so that the conveyer cannot be started until this treadle is released. For re-starting the conveyer after work has been changed, a third switch is arranged to shunt power past the switch 71. An emergency stop switch is also provided, by which the operator can stop the conveyer at any time. Fig. 9 shows a suitable wiring diagram, the conveyer-operated switch 71 being shunted when desired by the starting switch 74, and the treadle-operated switch 76 being in series with each of the others. 75 denotes the emergency stop switch. A relay E actuates a solenoid to move a main switch F to connect contacts L1g, L3h, and j, k respectively. When the conveyer is at rest, this relay is energized by closing the starting switch 74, current passing from the main terminal L3 by the path a, b, switch 76, and the relay E to the other main terminal L1. When the switch F is operative, the switch 74 may be allowed to open, the relay being then energized through the connected terminals j, k, and the switches 71, 75, 76. The driving motor M is connected to the terminals g, h. As a press approaches the operator's position, a fixed cam 78 actuates the deflating plunger 35, the cam 79 tips the bail 42, and a cam 81 swings the bridge 39 upwardly to facilitate change of work. The cam 81 is formed as a leaf spring so that it can yield as the bridge 39 is depressed by the operator to clamp a new shoe. A guard 80 prevents entanglement of bail members of empty presses.