Patent ID: 6679577
Filing Date: 2004-01-20
Classification: B41J

Abstract:
A method of performing printhead maintenance, applied in an image-printing apparatus for cleaning a printhead carried by a cartridge, wherein the printhead contains a plurality of orifices, the method comprising steps of:defining the orifices to form a plurality of orifice groups including a first and a second orifice group; providing a test graph which comprises a first and a second curve, associated respectively with the first and the second orifice group, wherein the first and the second curve have different curvatures; obtaining a printing result of the test graph by ejecting ink from the orifices of the printhead; selecting an orifice group to be cleaned according to the printing result of the first and the second curve; and giving a maintenance order to perform a cleaning action on the selected orifice group to be cleaned.