Patent GB-995945-A (GB)
Title: Improvements in or relating to coil-winding machines for winding rotors for electriccommutator motors
IPC: H02K15/09
Filed: 1963-10-04
Abstract: 995,945. Winding armatures. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Oct. 4, 1963 [Oct. 8, 1962], No. 39178/63. Heading B3A. An armature winding machine comprises a winding head mounted on a variable speed shaft and having means for mounting an armature with its shaft at right angles to the axis of the winding head, and means for locking the armature against rotation about its own axis, means controlled by the machine which are operable, after a coil has been wound at high speed, to unlock the armature and rotate it stepwise about its own shaft so that a further coil can be wound when the armature is locked again, and an arm which is operable during this stepwise rotation of the armature to catch the wire so that a loop is formed in it, wherein said arm has a suspension device for the loops, provided with an inlet remote from the axis of the winding head, in which the loops can be suspended in an unstretched condition and wherein the arm also includes a movable component which blocks the inlet of the device during low speed rotation of the head and opens said inlet during high-speed rotation. The winding head comprises an upper part 1 which is bolted to a lower part 3 and has a T-shaped recess 4 which accommodates a supporting block 5 having a recess 6. A pawl 7 is pivoted in the recess on a pin 8, and has an edge 11 which engages a slot 50 in the armature 10, A second slot 49 in the armature is engaged by an edge 12 of the block 5. There is also a locking spring 13 which engages the slot 50. The armature shaft is supported in blocks 14 and 15. The block 5 is secured to a rod 18 having a head 20 in which is a cross-pin 21 which projects through slots 22 in the lower part 3 and into bores in a sleeve 25 which surrounds the lower part 3. The sleeve is biased by springs 27 towards the upper part 1 and has external cams 25<SP>1</SP> and 25<SP>11</SP> which co-operate with rollers (not shown) to move the sleeve away from the upper part 1. The winding head is mounted on a driven spindle 33. Pivoted to a block 40 on the front surface of the upper part 1 is a lever 38 which is connected by a pin 35 and slot 37 to the block 5. At the outer end of the arm 38 is a pivoted hook 41 which is biased, to the position shown in Fig. 3, by a spring 43 and which also carries a resilient member 46 which is bent away from the arm to form a V-shaped recess. Operation.-Wire 47 runs from a reel through a wire guide and is wound into the slots 48 and 48a at high speed. When the slots are full, the speed of the winding head is reduced and a lever connected to the rollers is operated to move the block 5 towards the lower part 3, so that the outer end of the arm swings out and catches the wire 47, which is prevented from entering between the arm 38 and the resilient member 46 by the hook 41 so that a loop is formed in the wire. At the same time the edge 12 of the block 5 and the edge 11 of the pawl 7 are removed from the armature slots. When the block 5 is moved forward again the armature is rotated by the pawl 7 to bring the next pair of slots into the winding position. As the head rotates at high speed the hook 41 rotates about its pivot-pin under centrifugal force and is withdrawn from the loop of wire which is then free to move down the arm 38 against which it is lightly pressed by the resilient member 46, so that the loop is not under tension.