US Patent 7992493 Dampening water control method and printing apparatus

Patent 7992493 was granted and assigned to Dainippon Screen Mfg Co on August, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Dainippon Screen Mfg Co

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79924930

Patent Inventor Names

Takaharu Yamamoto0

Date of Patent

August 9, 2011

Patent Application Number

113321960

Date Filed

January 17, 2006

Patent Primary Examiner

‌

Daniel J. Colilla

Patent abstract

Line patches m and solid patches s are printed with a subject image, each line patches having at least 200 lines per inch and a duty ratio of at least 60%, to detect densities Dm and Ds. A water coefficient W (=Dm/Ds) is calculated from the detected densities Dm and Ds. Whether dampening water is fed at a proper rate or not is determined based on correlation data stored beforehand and showing a relationship between the feed rate of dampening water and the water coefficient W. The feed rate of dampening water is controlled to be a proper rate.