Color electrophotographic device with developer stirring

Details Color electrophotographic device with developer stirring Color electrophotographic device with developer stirring

1995-03-30

1996-06-25

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

347140, G03G 1508, G03G 1501

Patent

active

055305270

ABSTRACT:
A color electrophtographic printer has: a photosensitive drum on which electrostatic latent images are formed according to print data separated by colors; a plurality of developing units each including a developing powder container accommodating a two component developing powder formed by mixing carriers and toners, an apparatus for agitating the developing powder, and a unit for supplying the toners in the developing powder container; a unit for selecting one of the plurality of developing units according to color to be developed and for activating the same to develope the corresponding electrostatic latent image formed on the photosensitive drum; and a control unit for controlling the respective operations. A control unit is further provided for counting colored print data dots contained in print data for respective colors and for additionally activating the developing powder agitating prior to a subsequent developing operation for any of the developing units which have experienced developing of the electrostatic latent images formed with colored print data dots in excess of a predetermined count.

REFERENCES:
patent: 4267201 (1981-05-01), Nakahara et al.
patent: 5124751 (1992-06-01), Fukui et al.
patent: 5353102 (1994-10-01), Sato et al.

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