Image forming apparatus controlled by microcomputer

Details Image forming apparatus controlled by microcomputer Image forming apparatus controlled by microcomputer

1993-09-30

1996-02-27

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355206, 371 62, G03G 2100

Patent

active

054953146

ABSTRACT:
An image forming apparatus includes a microcomputer which controls components for executing an image forming operation, and sends a signal to a supervising portion when no abnormality occurs in itself. The supervising portion includes a watch-dog timer, and sends a reset signal to the microcomputer when the signal from the microcomputer is not continuously inputted for a predetermined time period or more. Accordingly, the microcomputer becomes in a reset state, and the image forming operation is stopped. A flag is not set until a predetermined time period elapses from a time that the reset signal is inputted, and therefore, the image forming operation is inhibited for the predetermined time period.

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patent: 5164770 (1992-11-01), Furuichi et al.
patent: 5239384 (1993-08-01), Takei et al.

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