Device for displaying warm-up waiting time of image forming apparatus
US4914476A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1988 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Oct 19, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/2003
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device installed in a copier, facsimile apparatus or similar image forming apparatus of the type including a fixing unit displays a waiting time necessary for the warm-up of the apparatus. The device calculates an elevation rate of fixing temperature within a predetermined time interval, produces a difference between a current temperature of the fixing unit and a set fixing temperature on the basis of the elevation rate, and thereby determines a waiting time. Further, the waiting time is determined on the basis of a temperature inside the apparatus when the ambient temperature is comparatively low and on the basis of a temperature of the fixing unit when it is higher than a predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.