Patent GB-635212-A (GB)
Title: Improvements in automatic control mechanism for working or production machines, e.g., winding machines for electrical armatures
IPC: F16H61/46
Filed: 1946-06-11
Abstract: 635,212. Coil making apparatus. JOELSON, K. E. A. June 11, 1946, No. 17498. Convention date, June 7, 1945. [Class 35] [Also in Group XXIX] A system for operating an armature winding machine, comprises a hydraulic motor, the direction of motion, the number of revolutions and the speed of which, are determined by a control valve conjointly regulated by a followup device driven by the hydraulic motor and a cam driven by a constant speed electric motor. Fig. 4 shows a machine for winding 4-pole armatures in which the armature 18 is mounted on a shaft 19 supported in a holder 17 rotatable through bevel-gear and a shaft 5 by the hydraulic motor 1. The control valve 3 is actuated by a rod 6 connected to a servo-arm 7 pivoted at one end to the machine frame and carrying at its opposite end a roller 8 resting on a gear wheel 9 in theform of a nut on a spring-loaded feeler 10 which abuts against the cam 40 rotatable through two revolutions during the winding of each armature by worm-gearing 26, 28 driven through a friction clutch 24 and a shaft 23 by the constant speed electric motor 20 mounted on a pivot 21, the worm 26 being normally held in engagement with the wheel 28 by a spring 33. Limitation of the cam-shaft to two revolutions is effected with the aid of a spring- loaded stop 30, having a head 32 held against the shaft 23 by a light spring 36 and an arm 34 engageable by an arm 35 on the cam-shaft, and a space 29 of reduced depth between a pair of teeth on the wheel 28. During the first revolution of the cam-shaft the worm 26 is held in half engagement with the wheel 28 so that on completion of the revolution the space 29 passes the worm. At the same time the arm 35 contacts the arm 34 to displace the head 32 and the worm is pulled by the spring 33 into full engagement with the wheel so that at the end of the second revolution the wheel is locked stationary. During the first half revolution of the cam 40, the feeler 10 moves downwards, together with the gear-wheel 9 and the valve rod 6, and the shaft 5 is rotated by the motor 1 in the direction to restore the wheel 9 and the valve rod 6 to their initial positions. During the second half revolution, the feeler moves upwards and the shaft. 5 is rotated in the opposite direction, the wheel 9 being restored to its initial position as before. At the instant of each reversal of movement of the feeler, the armature is rotated through 90 degrees to bring the next pole into position for winding through mechanism including a piston rod 52 which is moved upwards to strike an arm 54 on a shaft 53 carrying detents 55, 66 which are momentarily freed from engagement with a toothed wheel 58 to permit rapid rotation of the armature shaft through 90 degrees in a clockwise direction under the action of a spring 59, the detents being returned to their locking position, by the lowering of the rod 52 and the action of a spring 60 on the shaft 53. The rod is raised and lowered at the proper times by a spring-loaded piston in a cylinder 51 to which pressure liquid is supplied through a pipe 50 connected to a valve 49 having a rod 48 controlled by a solid cam 47 mounted on a shaft supported in a fixed bracket 45 so as to be free to slide laterally to a limited degree when a double tooth 44 on a wormwheel 42 abuts against a worm 43 on the motor shaft 5. The shaft rotates alternately in opposite directions and drives the armature holder, similarly so that successive poles are oppositely wound. Upon completion of the operation, the wound armature is replaced by an unwound one, and the machine is restarted by depressing the knob 39 to release the worm 26 from the wheel 28, the head 32 returning to its operative position under the action of the spring 36.