Scan assembly moved between alternate positions to prevent platen overheating
US4684237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1985 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Sep 27, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00603
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A scanning system for an electrophotographic printing machine is adapted to alleviate the problem of platen overheating when the machine is operated in a mode wherein documents are stream-fed past an exposure zone formed by a stationary scan/illumination assembly. The scanning system includes a scan/illumination assembly which moves beneath a stationary platen during a first, copying mode. When the mode of operation changes and the documents are stream-fed along the platen surface, the illumination/scan assembly is held stationary during each exposure cycle but is periodically moved to new positions during subsequent exposure cycles. A system controller monitors the stream-fed mode of operation and adjusts system timing and registration functions to compensate for the alternate scan/illumination exposure positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.