METHOD FOR DETERMINING INK DROP VELOCITY OF CARRIER-MOUNTED PRINTHEAD

摘要

A method for determining ink drop velocity of a printhead located at a gap above a print medium (24). A first ink mark (26) is printed at a first printhead velocity (CV1). A second ink mark (28) is printed at a different (in magnitude and/or direction) second printhead velocity (CV2). The ink for the second ink mark is ejected from the printhead at the same print ejection position (20) used for the first ink mark plus a predetermined offset distance (if any). The distance between the ink marks is measured. The ink drop velocity is calculated using the measured distance, the predetermined offset distance, the first and second printhead velocities, and the predetermined gap (23). In another method, an ink mark is printed, a distance is measured between the ink mark and the ink-ejection position, and the ink drop velocity is calculated using the measured distance, the printhead velocity, and the gap.