Fail-safe apparatus for image forming apparatus
US5068853A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1989 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Aug 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/80
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.