Patent ID: 6523921
Filing Date: 2003-02-25
Classification: B41J

Abstract:
A method of printing on a substrate comprising:moving a print head carriage, having a plurality of ink jet print heads thereon, parallel to a plane in which is supported a substrate having a surface that varies relative to said plane; then separately adjusting the distances from each of the print heads to the plane to position each of the heads at a respective predetermined distance from the surface of the substrate onto which ink is to be jetted from the heads; jetting ink from the heads, at their adjusted distances from said plane, across the respective predetermined distances onto the surface of the substrate; then further moving the print head carriage parallel to the plane while the substrate is supported therein; then separately readjusting the distances from each of the print heads to the plane to reposition each of the heads to maintain the respective predetermined distance from the surface that varies relative to the plane; and further jetting ink from the heads, at their readjusted distances from said plane, across the respective predetermined distances onto the surface of a substrate.