Inkjet printer and method for determining ink discharging timing

摘要

An inkjet printer is configured to acquire gap variation information related to a variation of a gap between a specific portion of an ink discharging surface and a recording sheet as a function of an inkjet head position, the specific portion located within a usage nozzle disposed area where usage nozzle rows to be actually used are disposed, determine representative gap variation information related to a variation, as a function of the inkjet head position, of a representative gap representing actual gaps between the usage nozzle rows and the recording sheet, by multiplying the gap variation information by a correction coefficient dependent on a width of the usage nozzle disposed area in a head moving direction and a wavelength of a wave shape of the recording sheet, and determine ink discharging timing based on the representative gap variation information, assuming that the actual gaps are equal to the representative gap.

主权项

1. An inkjet printer comprising:
an inkjet head configured to discharge ink from a plurality of nozzles formed in an ink discharging surface thereof, the plurality of nozzles arranged in a plurality of nozzle rows along a first direction, the plurality of nozzle rows arranged along a second direction that is perpendicular to the first direction and parallel to the ink discharging surface; a head moving unit configured to move the inkjet head relative to a recording sheet along the second direction; and a wave shape generating mechanism configured to deform the recording sheet in a predetermined wave shape that has top portions of portions protruding in a third direction toward the ink discharging surface and bottom portions of portions recessed in a fourth direction opposite to the third direction, the top portions and the bottom portions alternately arranged along the second direction, wherein the ink discharging surface includes a usage nozzle disposed area where usage nozzle rows to be used in a printing operation, of the plurality of nozzle rows, are disposed, and wherein half a width of the usage nozzle disposed area in the second direction is equal to or less than a distance between adjacent two portions of the top portions and the bottom portions.