Scan assembly moved between alternate positions to prevent plate

Details Scan assembly moved between alternate positions to prevent plate Scan assembly moved between alternate positions to prevent plate

1985-09-27

1987-08-04

Braun, Fred L.

Photocopying

Including fiber optics

355 30, G03G 1528, G03G 2100

Patent

active

046842373

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.

REFERENCES:
patent: 3712731 (1973-01-01), Shiina
patent: 4084897 (1978-04-01), Queener
patent: 4098552 (1978-07-01), Okukawa
patent: 4143964 (1979-03-01), Ogura et al.
patent: 4183656 (1980-01-01), Ishihara et al.

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