Patent ID: 9539807
Date: 2017-01-10
CPC Classifications: B41J

Claim:
1. A print apparatus for printing on a print medium, comprising: a print head; a control unit for causing the print head to move in a scanning direction, and for causing the print medium to be conveyed in an intersecting direction that intersects relative to the scanning direction; and an ejection control unit; the print head being provided with: a color nozzle column including color nozzle groups for each color, the color nozzle column being arranged in a single line along the intersecting direction and being configured to eject color inks of a plurality of colors; and a black ink nozzle column which is disposed in parallel with the color nozzle column in the intersecting direction in a position corresponding to the color nozzle column arranged in the single line along the intersecting direction and from which black ink is ejected, a length of the black ink nozzle column in the intersecting direction being the same as a length of the color nozzle column in the intersecting direction, wherein the black ink nozzle column is segmented into nozzle groups of the same number as the number of groups in the nozzle groups for the color inks; the control unit causing the print medium to be conveyed in a feed amount equivalent to the length, in the intersecting direction, of any one color nozzle group from among the color nozzle column, and the control unit causing one scan, either a forward path scan or a return path scan, of the print head to be executed every time the print medium is conveyed; and the ejection control unit ejecting the color inks from the color nozzle column on both the forward path scan and the return path scan of the print head, and causing the black ink to be ejected from the black ink nozzle column on only one scan, either the forward path scan or the return path scan, of the print head.