GB459818A - Improvements relating to multi-press machines having air operated presses - Google Patents

Abstract

459,818. Boot - making machines. COMPO SHOE MACHINERY CORPORATION, 565, 5th Avenue, New York, U.S.A. Jan. 31, 1936, No. 2958. Convention date, Jan. 31, 1935. [Class 17 (i)] Sole-laying.-In a machine of the kind in which a number of inflatable presses on an endless belt are intermittently moved, the work being changed at an operator's station, each press is automatically deflated while at rest prior to reaching the operator. Each press has an inflating and deflating valve of the kind having a projecting pin, pressure on which deflates the press, and at a position on the conveyer frame which each press reaches before reaching the operator, a spring-pressed bar, preferably engaging the pins of two consecutive presses, is released to press on the pins. Electrical and pneumatic means are described for releasing the bar. Beyond the operator's station, for re-inflating the press wherein a new workpiece has been positioned, a nozzle 18 is brought up to the valve on depression of a treadle, as in prior machines. The nozzle is slidable transversely of the conveyer in a carriage slidable longitudinally of the conveyer, and urged to normal position by a spring 21. As the press moves away from the operator's position an arm 22 thereon engages an arm 23 on the carriage when the valve and nozzle are in line, the carriage thereafter moving with the press until the conveyer comes to a drift stop. This movement of the carriage allows an arm 24 of an electric switch to open the switch releasing the plunger 30 of a solenoid to the action of a spring 32, the plunger carrying a bar 29 engaging the pins of the valves of the two consecutive presses next to reach the operator's position. Fig. 2 shows a suitable electric circuit, 33 being the main switch closed by the operator after work changing to cause the conveyer to advance the presses one step, M the motor driving the conveyer, 38 and 39 the electric terminals, and 42 a magnetic switch having conductors 43, 45, 50 connecting contacts shown when the coil 41 is closing the switch 33. The solenoid 31 is energized by the closing of this switch and remains energized after the opening of the same until the switch 24 also is opened. To allow the arm 22 to pass the arm 23 the latter is raised by a fixed cam. In a modification, the solenoid is de-energized by a photo-electric cell 57, Fig. 7, when light thereon from a lamp 55 is obstructed by the passage of a press 13. The generator G energizes the solenoid so long as the magnetic switch 62 is closed by current from an amplifier 64 in the circuit of the cell. In another modification, a pneumatic piston is substituted for the solenoid, a " bleeder " aperture in the cylinder allowing the piston to return comparatively slowly.