GB900046A - Heater working machine and method - Google Patents

Abstract

900,046. Making heaters for vacuum tubes. SYLVANIA ELECTRIC PRODUCTS Inc. Dec. 30, 1958 [Dec. 30, 1957], No. 42112/58. Class 39 (2). [Also in Group XXIII] A machine for processing heaters for vacuum tubes comprises a turret rotating intermittently in a clearance position relative to processing means at a plurality of work stations, the turret being adapted to move perpendicularly to the axis of rotation in at least one of the work stations and the processing means being movable towards and away from the turret in at least one other work-station. The machine shown has eight stations, at the first of which the heater is pushed up, at the third the insulation is stripped from the ends and at the seventh the heater is bundled for transfer, the remaining stations being idle. The turret head 66, Fig. 2, is supported by a carrier 62 which can be shifted laterally on supports 70 to bring gripping jaws 42, 44 into position to engage a heater carried by a collapsible mandrel 40. The head is moved laterally by a cam follower 96 engaging in a track 88a on a cam 88 driven from the main driving-shaft 84 through gears 104, 106. Indexing is effected by a cam 90 having a track 90a engaged by a pair of cam followers 102. The wires H, Fig. 19A, constituting the heater, are wound by known means on a mandrel 40 comprising jaws 40a, 40b which are normally spread apart but can be closed to allow the wires to be picked up by the jaws 42, 44. The jaws are carried by a transfer head 32 and are operated by a reciprocating shaft 136 actuated by a lift-plate 348 which is raised by a rack 346 driven by a gear 344. The gear is actuated at the appropriate time by bell-crank levers moved by cam-plates on a driven shaft. The shaft 136, Fig. 6, carries a wedge-shaped head 150 engaging rollers 146, 148 on pivoted yokes 142, 144 fixed to shafts 114, 116 carrying the jaws. Upward movement of the shaft 136 opens the jaws 42, 44 while downward movement first grips the wires H and then compresses them into a flat bundle. The insulation stripping device comprises a pair of abrading tools 46, 48, Fig. 9, carried in slideways on mounting blocks 174, 176, spring-biased towards one another and moved apart by a cam-operated spreader 150 engaging rollers 174c, 176c on the blocks. When the wires H arrive at the work-station, the tools 46, 48 are brought into engagement with them by cam action and are then reciprocated by rollers 46b, 48b spring-biased into contact with an arm 224 carried by an eccentricallydriven pin 222. At the last station, a pair of jaws 50, 52 (Fig. 14) carried by arms 252b, 254b, which urge the jaws together under spring action, are brought into operative position to pick up the wires H from the jaws 42, 44. The arms 252b, 254b are carried by a housing 244 mounted to pivot on a pillar 242, disc control cams 292, 294, Fig. 2, swinging the arms 252b, 254b into and out of operative position and opening and closing the jaws 50, 52.