Patent ID: 6764154
Filing Date: 2004-07-20
Classification: B41J,G06K

Abstract:
An ink-jet printing apparatus using a printing head having a plurality of nozzle rows, each with an arrangement of nozzles for ejecting ink, to print an image on a printing medium by repeating the steps of ejecting ink from the nozzle rows of the printing head onto the printing medium while moving the printing head in a main-scan direction and transferring the printing medium in a sub-scan direction perpendicular to the main-scan direction, wherein at least one of the plurality of the nozzle rows of the printing head is arranged at a position displaced from other nozzle rows in the sub-scan direction, said ink-jet printing apparatus comprising:changing means capable of changing the amount of transferring of the printing medium; and control means for changing the number of nozzles to be used in the printing, which nozzles belong to the nozzle row located at an upstream side in the sub-scan direction, before changing the amount of transferring of the printing medium by said changing means, and changing the number of nozzles to be used in the printing, which nozzles belong to the nozzle row located at a downstream side in the sub-scan direction, after changing the amount of transferring of the printing medium by said changing means.