US Patent 7558497 Image forming apparatus and image forming method

Patent 7558497 was granted and assigned to Konica Minolta on July, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Konica Minolta

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

75584970

Patent Inventor Names

Hideo Yamaki0

Date of Patent

July 7, 2009

Patent Application Number

116462760

Date Filed

December 28, 2006

Patent Primary Examiner

‌

Susan S Lee

Patent abstract

An image forming apparatus increases a primary-transfer pressure contact force at the times of primarily transferring black color to a first sheet and yellow and black colors to a second sheet or subsequent sheets in order to prevent misalignment of colors. The apparatus also decreases the primary-transfer pressure contact force at the times of primarily transferring yellow, magenta and cyan colors to the first sheet, and magenta and cyan colors to the second sheet or subsequent sheets in order to prevent central blurs of colors.