Patent ID: 9370927
Filing Date: 2016-06-21
CPC Classification: B41J

Claim Text:
1. An inkjet printing device, comprising: a print head having a nozzle row with a plurality of aligned nozzles; a nozzle selector for selecting plural ones of the nozzles continuously aligned in a part of the nozzle row as an active nozzle row; a main scan controller for driving the print head to perform a scan in a main scan direction intersecting the nozzle row; and a sub scan controller for moving a printing medium relative to the print head in a sub scan direction in parallel with a direction in which the nozzle row is extending, wherein the print head is driven by the main scan controller to perform the scan in the main scan direction and discharge ink on the printing medium through the active nozzle row and at least one of the nozzles not continuous from at least one end of the active nozzle row for performing a print operation, and the nozzle selector re-selects the active nozzle row so that an amount of shift of the active nozzle row from one end of the nozzle row is changed every time, when the active nozzle row discharges ink a predetermined number of times, wherein the nozzle row includes: the active nozzle row, the nozzles not continuous from at least one end of the active nozzle row, and an ink-discharge-inactive part consisting of ink-discharge-inactive nozzles, the nozzles not continuous from at least one end of the active nozzle row is disposed between the active nozzle row and the ink-discharge-inactive part, a relative position relationship between an active nozzle region of the active nozzle row, a not continuous region of the nozzles not continuous from at least one end of the active nozzle row and an ink-discharge-inactive region of the ink-discharge-inactive part is fixed.