Photocopying – Contact printing – Light boxes
Patent
1993-11-04
1995-07-18
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355326R, G03G 1508, G03G 1501
Patent
active
054346525
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 exprienced 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.
Fukasawa Nobuaki
Sasaki Akira
Tadokoro Hiroyuki
Terashima Isamu
Hitachi , Ltd.
Pendegrass Joan H.
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