Image forming apparatus capable of preventing adhesion of a deve

Details Image forming apparatus capable of preventing adhesion of a deve Image forming apparatus capable of preventing adhesion of a deve

1993-09-16

2000-10-17

Royer, William J.

Electrophotography

Control of electrophotography process

Of plural processes

399 50, 399 53, 399 55, 399149, G03G 1500

Patent

active

061343951

ABSTRACT:
An image forming apparatus capable of preventing unnecessary adhesion of a developer to an uncharged region of a latent image carrier. The image forming apparatus includes an endless latent image carrier, a charging unit for charging the latent image carrier, a latent image forming unit for forming a latent image on the latent image carrier charged, a developing unit for developing the latent image formed on the latent image carrier with a developer by supplying the developer to the latent image carrier under application of a developing bias voltage, and a transfer unit for transferring the image developed on the latent image carrier to a sheet. The image forming apparatus further includes a driving member for rotating the latent image carrier and for driving the developing unit to supply the developer to the latent image carrier, and a controller for effecting sequence control such that the application of the developing bias voltage to the developing unit is started a predetermined time after the rotation of the latent image carrier and the drive of the developing unit and also the charging operation of the charging unit have been started. Alternatively, a driving member for driving the developing unit is provided separately, and the controller effects sequence control such that the drive of the developing unit and the application of the developing bias voltage to the developing unit are started a predetermined time after the rotation of the latent image carrier and the charging operation of the charging unit have been started.

REFERENCES:
patent: 4373798 (1983-02-01), Tsukada et al.
patent: 4996567 (1991-02-01), Watari et al.
patent: 5148219 (1992-09-01), Kohyama
patent: 5155533 (1992-10-01), Kurokawa et al.
patent: 5164773 (1992-11-01), Nishio et al.
patent: 5283615 (1994-02-01), Yokoyama et al.
patent: 5294964 (1994-03-01), Oshiumi

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