Patent ID: 7213987
Filing Date: 2007-05-08
Classification: B41J

Abstract:
1. An apparatus for achieving synchronization in a value metering system using a digital print head capable of printing a plurality of printed lines on a substrate displaced relative to the print head in a moving direction, wherein the lines are substantially perpendicular to the moving direction, and a first signal is provided for indicating a line is printed, said apparatus comprises: a first mechanism operable at a first position to restrict the displacement of the substrate and a second position to effectively disengage from substrate, wherein the first mechanism is operated at the first position when the print head prints a line; a second mechanism, responsive to the first signal, for causing the first mechanism to operate at the second position thereby allowing the displacement of the substrate by a predetermined distance relative to the print head for printing a next line; and a third mechanism, responsive to the displacement of the substrate, for providing a second signal, indicative of the displacement of the substrate by the predetermined distance, for causing the print head to print the next line, wherein the third mechanism comprises an optical sensor that restricts the movement of the print head by a distance substantially equal to the width of one print line.