The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 1991
Filed:
Aug. 28, 1989
Applicant:
Inventors:
Assignee:
Konica Corporations, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 163 ; 371 14 ; 371 62 ;
Abstract
A fail-safe apparatus for an image forming apparatus includes a central processing unit (CPU), a drive section or load, a disconnecting circuit, and a watchdog circuit. The CPU controls an image forming sequence. The drive section or load is controlled by the CPU through an input-output controller. The disconcerting circuit disconnects power supply to the drive section or load upon reception of a trigger signal. The watchdog circuit monitors an operation of the CPU so as to output a reset signal to the CPU and the input-output controller upon detection of an operation abnormality, and to output the trigger signal to the disconnecting circuit.