Patent ID: 8491081
Filing Date: 2013-07-23
Classification: B41J

Abstract:
1. A printer comprising: a plurality of printheads positioned along a media path in the printer; a plurality of rolls positioned opposite the plurality of printheads along the media path to support media contacting and moving over the rolls in the plurality of rolls as the printheads eject ink onto the media moving along the media path; and a controller operatively connected to the plurality of printheads to operate the printheads selectively to eject ink, the controller being configured to generate a signal to operate a printhead in the plurality of printheads with reference to an angular position of a roll opposite the printhead, and to identify an angular position of the roll opposite the printhead for which the signal to operate the printhead is being generated, to generate the signal to operate the printhead to eject an ink drop onto a print medium while the roll opposite the printhead is in the identified angular position, and to identify a difference between a measured process direction position of the ink drop on the print medium and an expected process direction position of the ink drop on the print medium.