Patent ID: 8625159
Filing Date: 2014-01-07
Classification: G03G

Abstract:
1. 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, said method comprising the following steps: using the electrophotographic printing machine to print a plurality of first register lines with a first printing unit and pluralities of second or additional register lines with respectively each one of a second and additional printing units of the plurality of printing units in such a manner that each of the first register lines, together with a respective one of the second or additional register lines, is printed within a respective register frame that prespecifies a correct positioning of the register lines; detecting the plurality of said first and said second or additional register lines in the respective register frames with a register sensor; and using an analyzer circuit to compare a signal of the register sensor relating to the respective second or additional register lines with a first fixed intensity threshold value in order to determine if the second or additional register lines are recognizable.