Patent ID: 7866778
Filing Date: 2011-01-11
Classification: B41J

Abstract:
1. A printer comprising: a printhead module comprising a plurality of rows, each of the rows comprising a plurality of sequential nozzles for ejecting ink to form respective print lines on print media, wherein adjacent first and second rows of the plurality of rows are configured to print ink of a similar type or color with the remaining rows of the plurality of rows being configured to print ink of a different type or color from all other rows of the plurality of rows, the second row being a row of sequential nozzles which is redundant with respect to the row of sequential nozzles of the first row; and a controller connected to the printhead module, the controller being configured to control the ejection of ink from the nozzles so that the first and second rows eject ink to form alternate print lines regardless of whether faulty nozzles exist in the first and second rows, such that, in the event a nozzle in the first row is faulty, a corresponding redundant nozzle in the second row is controlled to print an ink dot at a position on the print media adjacent a position where the faulty nozzle would otherwise have printed it.