Patent GB-620019-A (GB)
Title: Improvements relating to machines for winding coils for dynamo-electric machines
IPC: H02K15/04
Filed: 1947-01-02
Abstract: 620,019. Coil-making apparatus. LUCAS, Ltd., J., SWIFT, W., and MASON, E. Jan. 2, 1947, No. 124. [Class 35] A machine for winding armature coils has a hollow rotary spindle carrying a wind - ing chuck with a plurality of pivotally mounted coil-forming jaws operated by a rod slidable within the spindle, and a wire cutter associated with a pair of wire gripper jaws carried at one side of the chuck and operated by a sleeve slidable on the spindle. Mechanism is provided for preventing the rotation of the chuck until all the jaws are closed. As shown, the spindle 7 which carries the chuck 67 on a plate 66 is hollow at its right-hand end to accommodate the rod 22 which opens or closes the pivoted coil-former jaws 69, 72 by the action of a spring sleeve 80 or a head 77 on projections 70 carried by the jaws. The plate 66 has a radially extending arm 81 which carries a movable bell-crank 83 pivoted at 84. The plate 66 also carries a sprung wiregripping abutment 86 and a wire-cutting element 82 co-operating with the jaw 83. The jaw 83 is closed against the pressure of a spring 91 by a cam surface 89 engaging a roller 90 mounted on the sleeve 64 sliding on the spindle 7. To operate the machine, the wire to be wound is first gripped in the jaw 83 by manually sliding the sleeve 64 and then the chuck jaws are closed by moving the rod 22 to the right through a lever 15 actuated at will by a compressed air cylinder 12. A pin 62 on the lever 15 simultaneously engages the inclined surface 61 of a pawl 57 on a lever 55. This lever is thus lifted and in turn lifts a lever arm 48, thus withdrawing a pin 52 from a cam groove 53 in a dog clutch member 9 which is slidable on the spindle 7. The clutch member 9, which is rotationally fixed to the spindle 7, is urged by a spring 11 into engagement at 97 with a driving sleeve 6 continuously rotated by a pulley 5. Engagement of the clutch causes rotation of the spindle 7 and the winding chuck. A gear drive 23-28 from the spindle 7 causes a shaft 29 to rotate, this shaft carrying a plate 45 with a notch 46, which, when displaced as shown in Fig. 3 prevents the reinsertion of a pin 51 attached to a bell-cranked portion of the lever 48 and so prevents the pin 52 from re-entering the slot 53 until the shaft 29 has completed one revolution. The shaft 29 also carries a cam 31 which acts on lever 33 and a slidable rod 95 to cause the desired oscillation of the wire guiding rollers 92, 93. When the required number of turns has been made, a projection 37 on the cam displaces a lever 42 and thus slides the collar 44 towards the chuck, thus also displacing the collar 64 through slidable rods 63. This causes the jaw 83 to open and release the wire. After rotating a further 90 degrees into the position shown in Fig. 1, the chuck is brought to rest by the engagement of the peg 52 in the cam groove 53 disengaging the clutch 97. The clutch jaws are then opened by means of the compressed air cylinder 12, the leftward motion of the rod 22 also returning the collar 64 and jaw 83 to the closed position, thus severing the wound coil, so that it may be removed after insertion of a clip at 76, and gripping the wire for the next coil.