Patent ID: 7559624
Filing Date: 2009-07-14
Classification: B41J

Abstract:
1. A printing device for printing images on an image-receiving member in multiple printing stages, the printing device comprising: at least one print head, said at least one print head being displaceable in reciprocation across the image-receiving member in a main scanning direction and having a plurality of discharging elements for printing in each printing stage a portion of an image by image-wise forming dots of a marking substance on the image-receiving member, each printing stage corresponding with a forward or backward traverse of said at least one print head in an operative state in the main scanning direction; a displacement device that establishes relative displacement between said at least one print head and the image-receiving member over the same constant predetermined distance in a sub-scanning direction after each printing stage; and a control that selects for each forward and backward traverse of said at least one print head in the main scanning path a different active portion of the plurality of discharging elements for different printing stages and for controlling image-wise activation thereof, wherein each active portion of discharging elements is selected on the basis of the predetermined distance so that for substantially each position in the sub scanning direction on the part of the image-receiving member where the image is to be rendered, the direction in which said at least one print head traverses the image receiving member is the same for each first exposure to an active portion of the traversing print head; and wherein in the subscanning direction, the time interval difference between the time of deposition of image dots originating from different traverses are minimized to reduce occurrence of gloss variations of said printed images.