Patent GB-673144-A (GB)
Abstract: 673,144. Filament-mounting apparatus. SYLVANIA ELECTRIC PRODUCTS, Inc. March 10, 1950 [March 11, 1949], No. 6135/50. Class 39(ii) Apparatus for mounting a filament upon the leading-in wires of a lamp stem assembly 9; e.g. of a photographic flash lamp, and adapted for use at a work station of an automatic stemmaking machine of the turret type described in Specification 619,826, [Group XXIII], comprises a pair of reciprocating grippers 26, Fig. 1, which draw a length of filament wire from a spool 15 and present it at an approximate position for mounting, whereupon separate means including a gauging device is operated to position the filament accurately before securing it to the leading-in wires, a cutting device being actuated to sever the mounted filament from the supply length immediately after the wire-grippers have returned to their initial position preparatory to feeding the next length of filament. The apparatus is mounted on a pair of vertical standards 5, 6, Fig. 3, carried by a bracket 3, the movements of the cooperating members being controlled by cam-operated rods actuated by cams on a pair of parallel shafts 1, 2, Fig. 4 (not shown). An arm 17 projecting laterally from the bracket 5 supports the filament wire supply spool 15, from which the wire 14 is taken along a guide arm 20 to the grippers 26 which are mounted on the inner end of a slide 23 arranged to be moved radially inwardly within guideways on a slide 22. The slide 22 is, in turn, movable upon guideways 24 mounted on the standard 5 in the direction of feed of the filament wire. Slide 22 is reciprocated by a bell-crank lever 55 which has one arm extending up through a slot between the guides 24, and the other arm pivoted to a vertical, cam-operated, rod 52. Slide 23 is actuated by a bell-crank lever 46 the upper end of which is doubly bifurcated to receive a rod 34 extending in to the slide, and also to engage a pair of rollers 47 on a pin 48 extending transversely through the rod. A transverse stud 33, Fig. 6, on the inner end of the rod 34 is guided within a slot 35 in the slide 23 and controls the opening and closing of the gripper jaws 26 by engaging cam surfaces on the inner ends of gripper actuator arms 30, the jaws being held closed by a spring 31 when the rod 34 is in its innermost position and opened when the rod is drawn outwardly. With the gripper jaws closed upon the filament wire 14 the slide 22 is moved in the direction to draw a length of filament from the spool 15 and position it slightly below the mounting plane and in front of the leading-in wires 11 extending downwardly from the inverted stem tube 9, whereupon an adjustable positioning bar 76, Fig. 11, pivoted at one end on a rigid bracket 78 on a vertically movable slide 68, is moved upwardly when the slide is raised by a cam-actuated rod 83. Surfaces 86 on the bar 76 thus engage the filament 14 in manner shown, and lift it upwardly while a gauging-surface 85 between the surfaces 86 engages the lower ends of the leading-in wires 11 and pushes the stem bodily upward if the ends are below the correct position. During the described movement the slide 23 has been moved inwardly so that the grippers have carried the filament wire across the gauging surfaces 86 and into notches 10 in the leading-in wires, the combined actions serving to position the filament in the bottoms of the notches. The ends of the filament are next secured within the notches by a swaging tool 73, Fig. 3, and co-operating anvil 72 at the upper ends of a pair of levers 71 forming a pincers device carried by a pivot 70 on the slide 68, the lower ends of the levers being each provided with a roller 74 and normally pulled towards one another by a spring 87; a wedge 75 at the upper end of a cam-actuated rod 91 forces the rollers apart to operate the swaging device. With a length of filament secured to the leading- in wires the grippers 26 are re-opened to release their hold on the extremity of the wire, and the slides 22, 23 are operated to bring the grippers back into their initial wire-feeding position and gripping the wire. Immediately the wire is again gripped the mounted portion is severed from the main length by a cutter 27, Fig. 8, mounted adjacent to the grippers and on the same pivot shaft 29, the cutter being actuated by a sliding rod 38 extending through the slide 23 into engagement with an offset lug 37 on the cutter. Longitudinal movement of the rod 38, in opposition to a spring 102, is effected by clamping one end within a lug on a collar 58 secured to the rod 34 which is coupled to the slide 23, as shown in Fig. 6.