Image forming apparatus including units for recovering...

Details Image forming apparatus including units for recovering... Image forming apparatus including units for recovering...

2007-12-11

2007-12-11

Chen, Sophia S. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S150000, C399S283000

Reexamination Certificate

active

11237802

ABSTRACT:
An image forming apparatus includes: a plurality of development units having developing-agent carriers which are provided in correspondence to three or more developing agents, and developing electrostatic latent images on surfaces of image carriers to form developing-agent images on the image carriers; and a recovery unit that recovers the developing agent adhering to the developing-agent carrier during non-development operation. The recovery unit is provided for at least the development unit other than the development unit that transfers the developing-agent image first in sequence among the plurality of development units. When one of the plurality of development units performs development by the developing agent whose charge capability is higher than that of the developing agent of the development unit that transfers the developing-agent image later in sequence, the recovery unit starts recovery of the developing agent or performs recovery operation for improving recovery capability of the developing agent.

REFERENCES:
patent: 6032012 (2000-02-01), Hirono et al.
patent: 6721522 (2004-04-01), Kakeshita
patent: 6950620 (2005-09-01), Yoshikawa et al.
patent: 5-53482 (1993-03-01), None
patent: 2002-31933 (2002-01-01), None

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