Electrophotographic type image forming device and developing rol

Details Electrophotographic type image forming device and developing rol Electrophotographic type image forming device and developing rol

1996-12-05

1999-02-02

Royer, William

Electrophotography

Image formation

Combined or plural functions by single component

399279, 399286, 492 28, G03G 1508, G03G 1530

Patent

active

058677550

ABSTRACT:
An electrophotographic type image forming device having a developing roller and a photosensitive drum. A nip portion is provided therebetween for supplying developing agents from the developing roller to the photosensitive drum. The developing roller and the photosensitive drum are rotated in the same rotational direction, i.e, a peripheral moving direction of the developing roller is opposite to peripheral moving direction of the photosensitive drum at the nip portion, so that toners provide vivid mobility at or adjacent the nip portion so as to cancel Van der Waals attraction force, and so that the toners can be attracted to the photosensitive drum only by applied electrical field. Developing is performed immediately upstream of the nip portion in rotational direction of the developing roller, and residual toners are collected by the developing roller immediately downstream of the nip portion for collecting and reusing the residual toners. Spherical tones as well as pulverized toners are used as the developing agent.

REFERENCES:
patent: 4317265 (1982-03-01), Chase et al.
patent: 4800147 (1989-01-01), Savage
patent: 5232500 (1993-08-01), Kamaji et al.
patent: 5253023 (1993-10-01), Hosaka et al.
patent: 5283618 (1994-02-01), Hosoya et al.
patent: 5434653 (1995-07-01), Takizawa et al.
patent: 5600417 (1997-02-01), Iguchi et al.
patent: 5697027 (1997-12-01), Takagi et al.

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