Electrophotography – Image formation – Development
Patent
1995-10-16
1997-06-17
Beatty, Robert
Electrophotography
Image formation
Development
G03G 1501
Patent
active
056406541
ABSTRACT:
A color image forming apparatus includes an image carrier member on which latent electrostatic images for respective colors are successively formed in accordance with image data, an image transfer member for transferring the toner images of the respective colors on a print sheet in a superimposed fashion, the image transfer member being turned in synchronism with the image carrier member while holding a print sheet thereon, the toner images being formed on the image transfer member every turn of the image transfer member, a plural number of developing subunits containing different colors respectively assigned thereto, and a developing unit. The developing unit sets one of the plural number of developing subunits to be used for developing a latent electrostatic image at a position facing the image carrier member. When one or more number of turns of the image transfer member are needed after the image transfer member is rotated one turn for transferring a toner image of a first color onto the print sheet but before the image transfer member is rotated one turn for transferring a toner image of a second color thereonto, the developing unit moves all of the developing subunits apart from the position facing the image carrier member during the period of time of one or more turns.
REFERENCES:
patent: 4078412 (1978-03-01), Suda et al.
patent: 4743938 (1988-05-01), Ohno
patent: 4772916 (1988-09-01), Mochida
patent: 5335056 (1994-08-01), Muramatsu
patent: 5486902 (1996-01-01), Ito
patent: 5508796 (1996-04-01), Sasame et al.
Beatty Robert
Fuji 'Xerox Co., Ltd.
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