Patent ID: 8827413
Filing Date: 2014-09-09
Classification: B41J

Abstract:
1. A printing apparatus for printing an image comprising: a print head including a first nozzle array for ejecting ink while scanning with the print head in a first direction and a second direction opposite to the first direction; a print medium supplying unit operable to supply a first print medium and a second print medium to a position for printing by the print head, wherein the second print medium is smaller than the first print medium in a crossing direction across a moving direction of the first and second print medium, and centers of the first and second print media are located at substantially the same position in the crossing direction when the media are conveyed over a platen; a pattern printing unit configured to cause the print head to print a first test pattern used for determining a first relative timing between an ejection from the first nozzle array, when the print head is scanning in the first direction, and an ejection from the first nozzle array, when the print head is scanning in the second direction, and a second test pattern used for determining a second relative timing of an ejection different from the first relative timing, wherein the first and second test patterns are printed on the first print medium; and a determining unit configured to determine the first relative timing based on the first test pattern printed by the pattern printing unit and the second relative timing based on the second test pattern printed by the pattern printing unit, wherein the pattern printing unit is further configured to print the first and second test patterns such that the first test pattern is printed at a position at which the second test pattern is printed in the moving direction and within a range of the centers of the first and second print media in the crossing direction, when the media are over the platen.