Patent GB-778037-A (GB)
Title: Improvements in or relating to core winding machines
IPC: H01F41/08
Filed: 1955-11-25
Abstract: 778,037. Winding toroidal coils. WESTERN ELECTRIC CO., Inc. Nov. 25, 1955 [Nov. 30, 1954], No. 33844/55. Class 83 (4). [Also in Groups XIX and XXXIX] Apparatus for winding small annular magnetic cores includes a carriage for supporting a core for rotation about its axis, means to rotate the carriage about a wire carrier to place the wire, which is secured to the carriage, on the carrier and to carry the wire around the core, and means to raise and lower the carrier above the core so that a needle attached to the wire is dropped through the core. A small magnetic core 20 which may have “ inch outside diameter and # inch inside diameter is supported on, and rotated about its axis by, three rubber rollers 21 mounted on a carriage 22 and driven, through a gear train from a worm gear 37 meshing with a worm 38 on a stationary shaft 39, as the carriage 22 is rotated around the shaft 39 so that the core rotates onehundredth of its circumference for each rotation of the carriage 22 about the shaft 39. One roller 21 is mounted in a pivoted bracket 26 and spring-urged towards the others. One end of wire 98 to be wound on the core is secured to a small reel 99 on the carriage 22 and the other end to a needle 101. The carriage 22 is secured to a hollow shaft 41 rotatable on the shaft 39 through pawl means 57, a pinion 54 and a vertically reciprocated rack 55. A finger 60 on the rack 55 engages a stop 62 on the carriage 22 to lock it in position at the end of a revolution. The rack is reciprocated by a ball 64 on a drive cord 65 engaging a spring clip 63 on the rack. In operation from the position of the apparatus shown in Fig. 8, wherein the wire 98, which has been given half a turn round the core 20 by rotation of the carriage 22 about the shaft 39 and a cylindrical wire carrier member 118, passes over the member 118 with the end attached to the needle 101 hanging down outside the core. On continued upward movement of the cord 65, after a stop member 66 has limited the movement of the rack 55 and caused the ball 64 to disengage the spring clip 63, a rubber knob 112 on the cord 65 lifts a member 113 on a carriage 114 in which the carrier 118 is mounted. The carrier 118 and needle 101 are thus lifted between a needle guide 80 and a needle guide roll 82 until the needle is positioned over the central hole of the core and between the guides 80, 82, by which time a ball 70 on the cord 65 has rocked a lever 72 to lift a rod 79 to close the guides 80, 82, together, Fig. 9. A motor 69 driving the cord 65 then reverses to allow the carriage 114 to drop. As the carriage 114 descends a lock member 128 is swung by engagement with a stop 133 to release the wire 98 and the carrier 118 is withdrawn to release the wire 98 completely by the engagement of a cross member 122 on the carrier 118 with slanted guides 123. The needle 101 thus drops through the core, Fig. 12, into a glass tube 107. The ball 63 on the cord 65 then engages the clip 64 to rotate the carriage 22 around the carrier 118 to the position shown in Fig. 8. An alternative wire carrier 197, Fig. 15, is non-retractable but has an inclined lower surface 199 off which the wire slips when the carriage 22 is rotated. One motor may drive the cord 65 one way and another motor the other way, the needle making a contact between the guides 80, 82 to fire a thyratron to stop one motor and start the other and a microswitch 151 starting the one and stopping the other. Electrically actuated counting means stop the machine after a predetermined number of turns have been wound. More than one wire may be wound on a core at a time in which case the needle 101 may be weighted by a tungsten point. Specifications 762,930, 773,165, [both in Group XIX], and U.S.A. Specification 2,348,889 are referred to.