Photocopying – Including fiber optics
Patent
1976-10-29
1978-08-15
Moses, R. L.
Photocopying
Including fiber optics
96 14, G03G 1500
Patent
active
041068688
ABSTRACT:
In electrographic copying apparatus of the type in which a powder image is transferred from a moving surface to a surface moving in pressing contact with it and then is transferred from the latter surface to a sheet of copy paper, pollution of the transfer station by powder is avoided by providing one of the two surfaces with at least one receding surface portion which recedes away from the other surface so as not to make contact with it, and causing a receding surface portion to be positioned opposite to the other surface so that the two surfaces are not in contact when no image transfer is being effected, such, for instance, as when powder images are not being formed or when a copy sheet is not being supplied so as to receive an image formed. Preferably, a roller for receiving and transferring each powder image from a moving photoconductive belt or drum is provided with two diametrically opposite receding surface portions located between two image receiving surface portions each of which is formed by a soft resilient coating layer, the area of which is the same as or slightly smaller than that of the sheet of copy paper.
REFERENCES:
patent: 2357809 (1944-09-01), Carlson
patent: 2781278 (1957-02-01), Harmon
patent: 2807233 (1957-09-01), Fitch
patent: 2889758 (1959-06-01), Bolton
patent: 3006317 (1961-10-01), Showalter
patent: 3318212 (1967-05-01), Rubin
patent: 3832055 (1974-08-01), Hamaker
patent: 3851964 (1974-12-01), Smith et al.
patent: 3936170 (1976-02-01), Shiband et al.
patent: 3947113 (1976-03-01), Buchan et al.
patent: 3978268 (1976-08-01), Kameda et al.
Johnston Albert C.
Moses R. L.
Oce'-van der Grinten N.V.
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