Patent GB-627159-A (GB)
Title: Improvements in and relating to machines for winding internally slotted members, particularly the stators of dynamo electric machines
IPC: H02K15/085
Filed: 1947-07-10
Abstract: 627,159. Coil-making apparatus. DUMBRILL, H. W., BOLDY, R. T., and SMALL ELECTRIC MOTORS, Ltd. July 10, 1947, No. 18296. [Class 35] In a machine for winding internally slotted stators, a wire guiding head is carried on a rod by which it is reciprocated through the core and beyond the core ends is moved relatively to the rod in a direction normal to the rod axis and is also caused to swing about the rod axis. ' The rod 11 carrying the head 10 is mounted in brackets 25, 25<SP>1</SP>, 25<SP>11</SP> and is reciprocated by compressed air cylinder 13. A drum 21 through which the rod can slide is mounted between supports 25 and 25<SP>1</SP>, mutual rotation being prevented by wheels 31 fixed to the drum and engaging splines in the rod. The drum is caused to oscillate by a gear 16 engaged by a-rack 17- actuated by the second double-acting cylinder 19. Peripheral grooves 22 on the drum, each carry a pair of adjustable stops 23 which limit the rotation of the rod by engaging an abutment 26. This abutment is slidably splined on a rockable shaft 24 and it can be moved along to engage any pair of the drum stops by manual control of a knob 30. Engagement of the stops gives the shaft 24 a small angle of rotation which is used to operate trip valves 38, 39 controlling the axial feed cylinder 13 through valve 14. A pair of collars 43, 44 fixed on the rod 11 act on cam members 63, 64 sliding on a rod 62 at the extremities of their motion. These cams are joined by a rod 65 and urged into a neutral position by springs 67, 68. When the cams are displaced from the central position, e.g. as shown, followers 70 or 71 are deflected and operate a winding head control valve 61. For operation, the abutment 26 is moved to engage the stops 23 on the drum which produce the degree of rotation for winding any required pair of slots in the stator 86. With the pistonrod 11 in its extreme right-hand position (shown), air is passed from the valve 14 through line 77 to the rear end of the cylinder to move the rod and head towards the left through the stator. As soon as the rod 11 moves into the stator, the cam 64 disengages follower 71 and compressed air is admitted by valve 61 through connection 78 and a bore in the rod 11 to lift the hollow wire guiding member 55, 56, 58 against a spring 53 by means of a piston 54 in cylinder 50. The rod 11 will move to the left until the collar 43 engages a stop 41 on a slidable shaft 40 which actuates a pair of valves 47, 48 connected to a cross-feed control valve 20 which passes air to the inner end of the cylinder 19 giving the winding head an anticlockwise rotation. Meanwhile, the collar 43 also displaces cam 63 and closes the valve 61. The air supply to the winding head is thus stopped and the head moves into its extended position. When the rotary motion is arrested .by the stop 23 the trip valve 39 controlling valve 14 is operated and air is admitted to the inner end of the cylinder 13. This moves the rod 11 rearwardly so that cam 63 is disengaged from its follower 70 and the valve 61 admits air to withdraw the winding head. Further movement of the rod moves the shaft 40 rearwardly to operate valves 47, 48 and towards the end of the stroke cam 64 engages follower 71, thus lowering the winding head again. Operation of valves 47, 48 allows air to enter the outer end of the cylinder 19 which rotates the head in a clockwise direction until arrested by one of the stops 23 which causes air to enter the rear end of the cylinder 13 to repeat the sequence. The machine may be adjusted to wind a differently spaced pair of slots by sliding the abutment 26 along shaft 24 so that it engages another pair of stops 23. Reversing valves 95, 96 allow coils of reverse rotation to be wound and the winding head cylinder 50 may be double acting. It is stated that the machine can be adapted to wind a plurality of stators simultaneously.