Patent GB-939984-A (GB)
Title: Apparatus for winding grid electrodes
IPC: H01J19/00
Filed: 1960-09-29
Abstract: 939,984. Making grid electrodes; coiling. SYLVANIA ELECTRIC PRODUCTS Inc. Sept. 29, 1960 [Sept. 29, 1959; Nov. 2, 1959], No. 33516/60. Classes 83 (2) and 83 (4). Apparatus for winding a helix of lateral grid wire on to a grid frame comprises a rotatable mandrel for supporting and rotating the frame, means for supplying and feeding the wire to the frame, means for producing relative movement between the feeding means and the frame so as to feed the wire along the frame whilst it is being wound thereon and means for securing the wire to a side rod of the frame solely at the beginning and completion of the winding operation. A grid frame 102, Fig. 8, is placed over a mandrel 126 carried by a spindle 142 which is then advanced by fluid pressure means 195 so that a tapered end 132 of the mandrel 126 enters a slot 150 in a receptor 144 carried by a spindle 148. A yoke 194, Fig. 3, additionally supports the spindle 142. A pin 200 on the ram of the means 195 engages a switch 202 to cause a solenoid 612 of a cam stop D to be energized to free cam-shafts 280, 578 for rotation and clutch in the drive thereto. A cam 278 on the shaft 280 then rocks a lever to raise a slide 254 carrying notching tools 246, 248 to form starting and terminal notches 242, 244, Fig. 6, in the frame 102. Timing switches 624, Fig. 14, driven by the shaft 578 are operated in sequence to actuate cam stops A and B on a shaft 166 to allow the shaft 166 to rotate the winding mandrel 126 for 180 degrees to position the frame 102 with the notches uppermost. Cam stop E is also actuated to stop cam-shafts 578, 280. Wire 100 to be wound is clamped between jaws 448, 450, Fig. 19, of wire guide means 446 on a slide 394. Cams 516, 528 on the shaft 280 then rotate to cause a wire threader means 486, Fig. 14, to draw the wire 100 across the frame 102, the jaws 448, 450 of the guide 446 being open, and position it in the starting notch 242. A ploughing tool 548, Figs. 3, 8, is then moved down by a cam 576, Fig. 14, on the shaft 578 to close the wall of the notch over the wire. Rotation of cam-shafts is then stopped, spindle drive-shaft 166 and a feed cam-shaft 334 driven from the shaft are rotated. The frame 102 is thus rotated, slowly at first under control of a servopotentiometer 358, while a cam 390 on the shaft 334 moves the slide 394, carrying a wire supply reel 426, along the frame, means 478 damping the vibration in the wire 100 as it winds on the frame 102. Rotation of the frame 102 causes the wire to break between the threader 486 and the frame 102. As the winding is completed rotation of the frame 102 slows and stops. The terminal notch 244 is then closed in the wire by a ploughing tool 554 moved down by a cam 604. The shaft 334 is then rotated in the reverse direction by a motor 368 to return the slide 394 at high speed. This causes the wire 100 to break between the frame 102 and the wire guide and clamp 446. Alternatively cutters may sever the wire. The mandrel 126 is then retracted from the working station and the completed grid is moved off the mandrel 126 by stripper pins 138. Apparatus automatically to position the frame on the mandrel may comprise a holder movable in three directions normal to one another by three cams, Figs. 32-36 (not shown).