Electrical control system for the movement of the pickup arm of

Details Electrical control system for the movement of the pickup arm of Electrical control system for the movement of the pickup arm of

1978-04-26

1980-01-22

Shepperd, John W.

Undertaking

274 23R, 318313, 318326, G11B 1706

Patent

active

041846877

ABSTRACT:
Electrical equipment for controlling an electric motor for the horizontal movement of the pickup member of a disc-record gramophone towards and away from the center of the gramophone turntable comprises position-selector means which, when set to any one of a number of predetermined positions of the pickup member, start the motor and emit a normally constant speed-reference signal controlling the motor speed and, upon receipt of a position-identifying signal from the selected position, cause the motor to be de-energised, thus terminating the motor-driven movement of the pick-up member, individual position-detector means, each so constructed as to perform the dual function of emitting such position-identifying signal and of varying the normally constant reference signal in accordance with the residual distance of the pick-up member from the accurate location of the selected position, thereby varying the motor speed so that the position-detector means work, in conjunction with the motor, as an approach servo.

REFERENCES:
patent: 3937903 (1976-02-01), Osann
patent: 3993315 (1976-11-01), Hansen et al.
patent: 4076258 (1978-02-01), Wren

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