Patent ID: 6409297
Filing Date: 2002-06-25
Classification: B41J

Abstract:
A method of relative alignment of a first imprint printed in a first traverse in a first direction along a first track by a print head and a second imprint printed in a second traverse in a second direction opposite to said first direction along a second track displaced relative to said first track; said print head including a plurality of selectively energisable printing elements disposed in a line; includes the steps of generating signals corresponding to increments of traverse of the print head; during the first traverse of the print head initiating printing of a first imprint; upon completion of printing said first imprint initiating stepping of a counter from a first count by said signals; terminating stepping of the counter in response to sensing of the print head passing a reference position in said first traverse; and during the second traverse of the print head initiating stepping of the counter by said signals in response to sensing of the print head passing the reference position in said second traverse; and in response to stepping of the counter to a second predetermined count initiating printing of the second imprint.