Electrophotographic copying machines of variable magnification

Details Electrophotographic copying machines of variable magnification Electrophotographic copying machines of variable magnification

1976-08-09

1978-08-08

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 60, G03B 2752, G03B 2770

Patent

active

041053265

ABSTRACT:
An electrophotographic copying machine of the type in which an original and a photosensitive member are both moved while maintaining a given optical relationship therebetween so that an optical system interposed between them focuses an image of the original onto the photosensitive member. A conveyor means is provided in the top portion of the machine, along with a plurality of original carriers for enabling a copying process to be performed at various magnifications which may be either equal to, greater or less than unity, the respective carriers being selectively adapted, when placed on the conveyor means to locate the original thereon at different respective distances from the optical system. Each carrier is moved with a varying speed which depends on the desired magnitude of the magnification while the photosensitive member is driven with a uniform speed.

REFERENCES:
patent: 2323600 (1943-07-01), Heybourne
patent: 3354777 (1967-11-01), Normandy et al.
patent: 3560087 (1971-02-01), Washio et al.
patent: 3592542 (1971-07-01), Kaufer et al.
patent: 3598489 (1971-08-01), Thomas et a.
patent: 3737223 (1973-06-01), Yamamoto
patent: 3912392 (1975-10-01), Shogren
patent: 4007986 (1977-02-01), Komori et al.

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