Circuit for detecting door state in copying apparatus

Details Circuit for detecting door state in copying apparatus Circuit for detecting door state in copying apparatus

1979-01-05

1981-02-03

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

340644, 355 3R, G03G 1500

Patent

active

042485266

ABSTRACT:
A level shift circuit for indicating the open or closed condition of an access door of a copier senses the powered condition of operating portions of the copier to which the supply of power is interrupted when the access door is open and provides a corresponding logic signal to a sequence control circuit of the copier. In the disclosed embodiment, a series-connected resistor and zener diode are connected to the copier operating portions to provide an output signal through an inverting buffer to the sequence control circuit.

REFERENCES:
patent: 3692401 (1972-09-01), Kawai
patent: 3737734 (1973-06-01), Nakamura et al.
patent: 4048666 (1977-09-01), Irie et al.

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