Electronic delay timer

Details Electronic delay timer Electronic delay timer

1987-06-05

1987-12-22

Gellner, Michael L.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

H01H 4732

Patent

active

047149779

ABSTRACT:
A machine tool timing relay has immunity from electrical noise on a control signal, and has an oscillator capable of generating pulses having a predetermined frequency, a means for adjusting the predetermined frequency over a continuous range of frequencies, a counter capable of counting the pulses and capable of generating an output signal after a predetermined number of the pulses are counted, means responsive to a start signal for initiating the counter to count the pulses, an optical isolator circuit responsive to the control signal for generating a light, detecting the light, and generating the start signal in response to detecting the light in order to isolate the counter from electrical noise mixed with the control signal, an electrical contact, and an output circuit responsive to the output signal for operating the electrical contact when the counter generates the output signal so that the contact is operated after the counter counts a predetermined number of the pulses. The contact is controlled after an interval of time required for the oscillator to generate the predetermined number of pulses. An electromechanical relay serves as the contact.

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patent: 4260912 (1981-04-01), Bjorke
patent: 4498019 (1985-02-01), Berger

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