Patent GB-978620-A (GB)
Title: A machine for winding armatures of dynamo electric machines
Inventor: SHELDON ROBERT CYRIL
IPC: H02K15/09
Filed: 1963-06-19
Abstract: 978,620. Winding armatures. JOSEPH LUCAS (INDUSTRIES) Ltd. June 19, 1963, No. 24434/63. Heading B3A. A method of winding armatures on a machine comprising a plurality of radial wire guides, a reciprocable and angularly movable headstock spindle, means at one end of the headstock spindle for gripping an armature spindle and means at the said end of the headstock spindle for gripping wires located in the guides, comprises the steps of gripping the wires relative to the headstock spindle, winding a number of turns less than the full number of turns on to the armature, inserting the wire portions adjacent the gripped ends into the commutator slots and at the same time severing the gripped ends of the wire, winding the remainder of the turns on to the armature, regripping the wire relative to the headstock spindle and at the same time inserting the free ends of the winding into the commutator slots. A machine for carrying out the method comprises a bed a, and a two-part headstock comprising a lower part c slidable on the bed and an upper part b slidable on the lower part and actuated by a fluid cylinder g. The lower part is reciprocated by a cam d. In the headstock is an angularly movable hollow spindle 60 which is fixed axially and at one end is rotatably supported in a flanged member 63, itself angularly movable relative to the headstock. Journalled in the spindle is a shaft 61 which is angularly moved by a rack q actuated by a cam s. External teeth on the member 63 engage a rack 64 actuated by a fluid cylinder, and dog-teeth in the endface engage with complementary teeth formed on a part 66 non- rotatably mounted on the spindle 60. On the opposite end of the part 66 are further dog teeth adapted to engage complementary teeth 67 on a part 68 secured to the shaft 61. The part 66 is moved axially by a fluid cylinder 69. At the other end of the spindle is a gripper 71 including a collet 79a, an inner part 72 and an outer part 73 splined to the inner part. The inner part 72 has a flange which has as many slots 84a, defining tongues 85, as there are commutator segments, and the adjacent face of the outer part 73 is also slotted to define tongues 87. The spline 74 positions the parts so that the tongues 85 and 87 are aligned. The wire feed mechanism comprises a fixed body 88, a flanged ring 89 and an actuating ring 90, mounted in bearings 91 and having peripheral teeth engaged by a fluid-operated rack 92. Also formed on the ring 91 are teeth which engage with a plurality of pinions 93 pivotally mounted on the flanged ring 89 and driving angularly movable guide tubes 94 disposed in the flanged ring 89. Movement of the rack 92 rotates the guide tubes through 90 degrees and each tube has two holes 95 through which the wires pass. Adjacent each tube 94 are two pairs of cutters radially movable in the flanged ring 89 and disposed so that when the holes 95 are circumferentially aligned a pair of cutters 98a and 98b is longitudinally aligned with each orifice. The cutters are mounted on slides 99 operated by the pistons 100 of fluid cylinders and co-operate with cutting edges within the slots 84a in the part 72. Cycle of operation.-The operating cycle is started manually and thereafter controlled by a camshaft. An armature is loaded into the machine and the spindle thereof is gripped by the collet 79a and the machine started. The armature is drawn away from the wire feed mechanism so that the wires from the guide tubes are hooked round the tongues 85 and laid in the slots 84a. The armature is then rotated through 90 degrees, and the guide tubes 94 are rotated through 90 degrees so that the holes 95 are longitudinally aligned. Two turns of wire are laid in the armature slots and then the spindle 60 is locked to the member 63 by operation of the cylinder 69 thereby aligning slots in the commutator with the cutters 98b which then operate to sever the wires and force them into the commutator slots. The cutters are withdrawn, the spindle 60 re-engaged with the shaft 61 and the full number of turns wound on the armature. At the end of the winding the armature is rotated 90 degrees to its original angular position, the spindle is locked to the member 63 and is moved angularly in the reverse direction an amount equal to the pitch angle of the commutator segments. The guide tubes 94 are rotated through 90 degrees and by operation of the cylinder g the wires from the guide tubes are drawn through the slots 84a, and by operation of the rack 64, are hooked around the tongues 85 and then gripped between the inner and outer parts 72 and 73 of the gripper. The cutters 98a are then operated to sever the wires and insert them into the commutator slots. The cutters 98a are of such a width that a portion of the walls of the slots will be peened over to retain the wires. Specification 656,594 is referred to.