Patent ID: 8366230
Filing Date: 2013-02-05
Classification: B41J

Abstract:
1. An ink jet printing apparatus comprising: a moving unit for reciprocally moving, in a main scan direction, a print head having a nozzle array that is formed by arranging a plurality of nozzles for ejecting ink onto a print medium; a conveying unit for conveying a print medium by employing conveying rollers that are arranged on an upstream side and a downstream side of the print head in a direction that crosses the main scan direction; and an ejection control unit for controlling ink ejection timing for ejecting ink through the nozzles, wherein, for a case of printing to be performed with the print medium sandwiched between the conveying rollers either on the upstream side or the downstream side and for a case of printing to be performed with the print medium sandwiched between the conveying rollers on both the upstream side and the downstream side, the ejection control unit differs the ink ejection timing for travel performed one way of the reciprocating movement and for travel performed the other way.