Developing device and multi-color recording apparatus

Details Developing device and multi-color recording apparatus Developing device and multi-color recording apparatus

1989-05-17

1990-08-07

Prescott, A. C.

Photocopying

Contact printing

Light boxes

355265, 355326, G03G 1508

Patent

active

049472003

ABSTRACT:
A developing device is of non-contact development type in which a toner is jumped to a photoconductor to develop a latent image on the photoconductor. The developing device is controlled in height of a developer-agent layer on a developer roll, and sets a developing gap between the photoconductor and the developer roll in such a manner that a driving electric field required for jumping of the toner can be maintained at the air gap between the photoconductor and a developer-agent layer on the developer roll and developing bias voltage can be brought to a value lower than charged electric potential of the photo-conductor. By setting the developing bias voltage to the valve lower than the charged electric potential of the photoconductor, jumping of additional or unnecessary toner is restricted so that contamination of an image and a recording sheet can be prevented. Further, a multi-color recording apparatus having this developing device prevents toner developer agents different in color from being brought into contact with each other to form a clear multi-color image without mixing in color and contamination.

REFERENCES:
patent: 3702483 (1972-11-01), Fantuzzo
patent: 4324199 (1982-04-01), Morikawa
patent: 4422749 (1983-12-01), Hoshino et al.
patent: 4734735 (1988-03-01), Haneda
patent: 4766458 (1988-08-01), Oka et al.
patent: 4799086 (1989-01-01), Mori
patent: 4811686 (1989-03-01), Yamane
patent: 4851884 (1989-07-01), Folkins

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