Patent ID: 8998378
Filing Date: 2015-04-07
Classification: B41J

Abstract:
1. An ink jet printing method, wherein a recording medium is moved relative to a print head having a plurality of nozzles, said method comprising the steps of: a) adding spit pattern data to print data to be printed by the print head; b) supplying the print data and the added spit pattern data to the print head; c) ejecting ink droplets from the plurality of nozzles onto the recording medium in accordance with the print data and the spit pattern data in a single pass of the recording medium along the print head; d) scanning a location of an expected ink dot ejected according to the spit pattern data by a nozzle of the plurality of nozzles, thereby providing a scanned image; e) analyzing the scanned image in order to determine an actual presence of the expected ink dot; and f) if it is determined that the expected ink dot is absent, applying nozzle failure correction during the same pass for the nozzle intended to eject the ink dot with respect to the ink droplets that still have to be ejected onto the recording medium and were intended to be ejected by the nozzle.