Method for determining register errors on a printed product provided with register marks

摘要

In a method for indicating registering device malfunctions on a printed product equipped with registering marks (4, 5, 6), the registering marks (4, 5, 6) being scanned opto-electrically on passage of the printed product through the printing machine, the registering marks (4, 5, 6) are scanned twice in the direction of travel of the web at a predetermined separation. By subtraction of the signals obtained by the scanning, a further signal arises. The temporal position of the extreme value of the further signal constitutes a measure for the position of the registering marks. …IMAGE…