GB191403360A - Improvements in Impulse Control Systems for Automatic Telephone Exchanges. - Google Patents

Abstract

3360. Western Electric Co., [Woodward, F. T., acting for Western Electric Co.]. Feb. 9. Automatic exchange systems. - Relates to means for controlling the movement of a powerdriven switch by number impulses. The controlling - impulses complete a circuit for the clutch magnet of the switch over the windings of a differential relay, and when the switch responds, this relay opens the circuit of the clutch magnet. In the form shown in Fig. 1, the switch to be actuated has a clutch magnet 13, and controls contact-springs 14, 15. The contact of the spring 14 is open when the switch stands in its stopping positions, but is closed during the movement from one position to the next; the contact 15 is closed in the stopping positions and open during movement. The number impulses produced by the key 11 actuate the relay 12, thus completing a circuit for both windings of the relay 16 and for the clutch magnet 13. The spring contact 14 ensures a complete step of the switch, and the contact 15 opens the circuit of the winding 18, thus causing the other winding 17 to energize the relay. The circuit of the clutch magnet is thus held open at the contact of the relay until the armature of the relay 12 drops back. Fig. 2 shows a form in which a register-controller switch having a clutch magnet 13<1> is restored to normal by impulses produced by the movement of the selector switch 26. The springs 22, 23, 24 are controlled by a sequence switch, and during the movement of this switch from its second to its sixth position, the contact 22 is closed, thus energizing the relay 16<1> and opening the circuit of the clutch magnet. When the sixth position is reached, and the starting- circuit of the selector is closed, the relays 27, 12' are energized. The relay 27 starts the movement of the selector switch, and the relay 12<1> opens the circuit of the relay 16<1>. The switch 26 at each step short-circuits the relay 12<1>, and this relay, when de-energized, closes a circuit for the clutch magnet 13<1> and both windings of the relay 16<1>. The springs 14<1>, 15<1> close their contacts at the same time as the similar springs shown in Fig. 1, so that each movement of the switch opens the circuit of the winding 18<1>, and causes the energization of the differential relay 16<1>, thus opening the circuit of the clutch magnet. The controller 13' is thus moved step by step by the impulses produced by the switch 26, and is arranged to stop the switch when the normal position is reached. Specification 5653/13 is referred to.