Image forming apparatus including a toner discharge operation

Details Image forming apparatus including a toner discharge operation Image forming apparatus including a toner discharge operation

2008-02-20

2010-06-15

Chen, Sophia S (Department: 2852)

Electrophotography

Image formation

Development

C399S027000

Reexamination Certificate

active

07738815

ABSTRACT:
The level of toner color mixture in a developing device is maintained within the range not affecting the color shade of a final color image. In an image forming apparatus including four imaging units and placed along a moving intermediate transfer body, the imaging units having developing devices for developing an electrostatic latent image formed on a photoconductor to create a toner image and for collecting toner remaining on the photoconductor after transfer of the toner image, the developing device in the imaging unit performs forcible toner discharge operation when a toner mixture amount in the developing device of the imaging unit, which was computed from toner consumption of the imaging unit located on an upstream side, exceeds a predetermined value.

REFERENCES:
patent: 7418223 (2008-08-01), Suzuki
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patent: 2005/0025526 (2005-02-01), Takahashi et al.
patent: 2007/0253742 (2007-11-01), Maeshima et al.
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patent: 2000-181169 (2000-06-01), None
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patent: 2004-45700 (2004-02-01), None
Machine translation of JP 2001-337503 A dated Sep. 15, 2009.
Japanese Office Action mailed on Dec. 2, 2008 directed towards counterpart foreign application No. 2007-039370; 6 pages.

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