Apparatus to prevent contamination of fixing unit in image...

Details Apparatus to prevent contamination of fixing unit in image... Apparatus to prevent contamination of fixing unit in image...

2011-08-30

2011-08-30

Ngo, Hoang (Department: 2852)

Electrophotography

Control of electrophotography process

Control of exposure

Reexamination Certificate

active

08010003

ABSTRACT:
When the density of a toner image of a leading end of a printing sheet is no less than a predetermined reference density, a printing start time is delayed or printing data is deleted so that printing data is not printed in the leading end of the sheet. When the printing is performed in a state where a cover used for copying is opened, a printing start time is delayed or the printing data of the leading end of the printing sheet is deleted. Therefore, it is possible to prevent a fixing unit from being contaminated due to the toner image transferred to the leading end of the printing sheet.

REFERENCES:
patent: 5565972 (1996-10-01), Honda et al.
patent: 5638098 (1997-06-01), Iwata et al.
patent: 6785480 (2004-08-01), Toyohara et al.
patent: 6900906 (2005-05-01), Tanaka
patent: 2005/0063720 (2005-03-01), Fujita et al.
patent: 2001-160899 (2001-06-01), None
Korean Office Action dated Mar. 18, 2011, issued in Korean Patent Application No. 10-2006-0126380.

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