Recorder control circuit for suppressing incipient arcing at the

Details Recorder control circuit for suppressing incipient arcing at the Recorder control circuit for suppressing incipient arcing at the

1981-03-12

1982-08-03

Hartary, Joseph W.

Recorders

Writers

Receiver and marker movable

219216, 219509, 361 91, 346146, G01D 308

Patent

active

043430104

ABSTRACT:
In an improved control circuit for the heating current of a system for developing latent photographic images on a heat developable medium, an incipient loss of tension in the record medium is sensed by detecting high frequency components of the energizing current incident to incipient arcing at the heating electrodes. The resulting signal is utilized to interrupt the flow of current to the heating electrodes, to prevent further arcing and the danger of fire. A time delay feature is incorporated to restore the heating current after a predetermined delay. If the tension in the record medium has not been restored, then the incipient arcing will again cause an interruption of the heating current.

REFERENCES:
patent: 4165512 (1979-08-01), Peterson
patent: 4177469 (1979-12-01), Peterson
patent: 4213136 (1980-07-01), Jenkins et al.
patent: 4267434 (1981-05-01), Simpson

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