Patent GB-606579-A (GB)
Title: Improvements in and relating to electric remote indicating or control systems
IPC: G08C19/20
Filed: 1945-11-23
Abstract: 606,579. Electric control systems. WYNNE, T. E. Nov. 23, 1945, No. 31682. [Class 40 (i)] An electric remote indicating and/or control system comprising a transmitter and receiver at opposite ends of an interconnecting link, wherein a predetermined setting at the transmitter causes a corresponding set at the receiver, and the transmitter to make a movement corresponding to the setting in synchronous operation. In the embodiment, Fig. 3, closure of the main switching control means 11 which may comprise two coacting discs, Fig. 4 (not shown), carrying associated contacts arranged to separate when the position of the main setting movement and the transmitter motor correspond, produces, with the contact arms and contacts 12, 14, 16, 17, 18, 18<SP>1</SP> in the position shown, energization of transmitter motor coil 13 and the advance by one step of the transmitter motor drive disc (not shown). A toothed wheel, Fig. 2 (not shown), mechanically coupled to the motor disc, opens contact 14 and closes 16 to energize receiver impulse motor coil 15. This motor steps an associated toothed wheel (not shown) which opens contacts 12, 17 and closes contacts 18, 18<SP>1</SP> to deenergize coil 15 and energize coil 13. Motor 13 rotates a further step in the same sense and the associated toothed disc opens contact 16 and closes 14. The cycle is repeated to advance the receiver synchronously with the transmitter and continues until the main switch 11 is opened. For the repeater movement to follow the main setting movement in either. direction a selector means, Fig. 7, is employed, comprising a cam-wheel 33 and a switch arm 34 which connects with either contact 35 or 36 to energize one or other of the opposed coils of a two-way impulse motor, Fig. 6 (not shown), at the receiver which coact, as in Fig. 3, with corresponding opposed motor coils of the transmitter motor, Fig. 8 (not shown). The cam-wheel 33 is driven by the transmitter motor, in a direction determined by the motor coil selected, back to its original setting. Where considerable accuracy of correspondence is necessary, e.g. where small movements are to be transmitted, the switching mechanism in Fig. 7 may be used. A rotation of cam-wheel 33 produces, through gearing 40, an amplified movement of cam-wheel 39, to close contacts 37 or 38. On further movement of wheel 33 to close the main switch 35 or 36, the switch 43 is opened by projection 42 on wheel 41 carried on the same shaft as wheel 33. An increase in speed of operation may be effected by gears associated with the receiver and transmitter motors. After an initial small turn, during which the drive is transmitted through. the gearing, the drive becomes direct and advances with the normal coarse steps until the final coarse step of the transmitter motor over-runs the desired setting and the switch means associated with it are reversed. Thereupon the gearing is reintroduced and the controls urged into precise alignment. In a modification of the switch control apparatus, an axially movable shaft, spring connected to the impulse motor, carries a disc which operates the switch contacts in response to the main movements and in a further modification the main control contacts are operated by a recessed disc mounted on a shaft driven from a differential gearing assembly which receives motion from the main control and the transmitter motor.