Printing apparatus

Details Printing apparatus Printing apparatus

1996-02-21

1998-02-24

Burr, Edgar S.

Typewriting machines

Safety switch or condition-responsive-cutoff switch for...

400 74, 395113, B41J 2960

Patent

active

057205604

ABSTRACT:
A printing apparatus comprises a CPU 1, an image formation part 9, an interface 7 for communicating with an external host apparatus 19, an operation panel 8 which includes an operation switch and the like, etc., and a power cutoff circuit 12 which operates in response to an instruction which is expressed by a power save signal 17. The printing apparatus also comprises a voltage monitoring circuit 15 for monitoring a signal level change of a host side signal, such as a strobe signal, which is supplied from the external host apparatus 19. When the voltage level of the host signal is intermediate between a first reference voltage V1 and a second reference voltage V2, the voltage monitoring circuit 18 judges that power supply to the external host apparatus 19 is cut off.

REFERENCES:
patent: 4834562 (1989-05-01), Shikanai et al.
patent: 5114252 (1992-05-01), Tanuma et al.
patent: 5449238 (1995-09-01), Pham et al.

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