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US Patent 7333759 Image forming apparatus

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Patent abstractTimelineTable: Further ResourcesReferences
Is a
Patent
Patent
1

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
73337591
Patent Inventor Names
Satoshi Kaiho1
Date of Patent
February 19, 2008
1
Patent Application Number
112230421
Date Filed
September 12, 2005
1
Patent Primary Examiner
‌
Susan Lee
1
Patent abstract

A transfer roller drive unit sets an all-separate mode after setting a full-color mode, sets a monochrome mode after setting the all-separate mode, and sets a full-color mode after setting the monochrome mode. Namely, a transfer belt 25 comes into contact with the photosensitive drum 24 first, and then the photosensitive drums 21, 22 and 23. This pattern is repeated. The transfer belt 25 does not come into contact with the photosensitive drums 21, 22, 23 and 24 at a time.

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