Method for detecting errors in individual color separation images of a multi-color printing machine

US8625159B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Jan D. Boness · Bad Bramstedt, DE
• Ingo Dreher · Kiel, DE
• Heiko Hunold · Wattenbek, DE
• Ralf Jachmann · Glücksburg, DE
• Ralph Petersen · West Allis, US
• Frank Pierel · Kiel, DE
• Stefan Schrader · Kiel, DE
• Matthias Wecker · Bad Hersfeld, DE
• Tim D'Avis · Schwentinental, DE

Key dates

• Filing date: Jan 22, 2009
• Grant date: Jan 7, 2014
• Expiry date: Aug 18, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/0161
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for detecting errors in individual color separation images of a multi-color printing machine, in particular an electrophotographic printing machine, comprising a plurality of printing units, is described. Using this method, first a plurality of first register lines is printed with a first printing unit, and a plurality of second register lines is printed with a second printing unit in such a manner that each of the first register lines, together with one of said second register lines, is positioned inside a respective registration frame. Then the plurality of the first and second register lines in the respective registration frame are detected with a register sensor, and an output signal of the register sensor relating to the respective second register line is compared with an intensity threshold value in order to determine whether the second register lines can be recognized. In an alternative embodiment of the method, a plurality of the first register lines is printed with a first printing unit in such a manner that each of the first register lines is printed within a respective registration frame. Subsequently, the plurality of the first register lines in the respective …