Patent ID: 8251480
Filing Date: 2012-08-28
Classification: B41J

Abstract:
1. An ink jet printing apparatus for printing on a print medium, comprising: a print head having a plurality of ejection ports for ejecting ink while scanning in a scan direction; a conveyance unit including a pair of rollers for conveying the print medium in a conveyance direction crossing the scan direction by rotating the pair of rollers, the pair of rollers being provided at a position on an upstream side in the conveyance direction of the print medium from a print position at which printing by the print head is performed; a detection unit configured to detect an error in a conveyance of the print medium by detecting a downstream side end of the print medium, wherein the detection unit is disposed at a distance downstream in the conveyance direction from the pair of rollers, such that the detection unit detects the downstream side end of the print medium at a time when an upstream side end, in the conveyance direction, of the print medium is released from the pair of rollers; and a change unit configured to change the ejection ports available for printing according to the error in conveyance detected by the detection unit.