Patent ID: 8926055
Filing Date: 2015-01-06
Classification: B41J

Abstract:
1. An inkjet printer comprising: an inkjet head configured to discharge ink droplets from nozzles formed in an ink discharging surface thereof; a head moving unit configured to reciprocate the inkjet head relative to a recording sheet along a head moving direction parallel to the ink discharging surface; 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 first direction toward the ink discharging surface and bottom portions of portions recessed in a second direction opposite to the first direction, the top portions and the bottom portions alternately arranged along the head moving direction; a storing device configured to store gap information related to a gap between the ink discharging surface and the recording sheet, the gap information comprising a plurality of pieces of gap information respectively corresponding to a plurality of examined sections discretely arranged along the head moving direction on the recording sheet, each of the plurality of examined sections including a corresponding one portion of the top portions and the bottom portions on the recording sheet; a calculating device configured to calculate interpolation gap information to be interpolated over a whole width in the head moving direction of at least one of a plurality of segments, each of which has a width in the head moving direction defined by two adjacent sections of the plurality of examined sections, based on the gap information stored in the storing device, the plurality of segments comprising a first segment for which the interpolation gap information is calculated by the calculating device and a second segment for which the interpolation gap information is not calculated by the calculating device; and a discharging timing determining device configured to: determine first ink discharging timing with which the inkjet head is to discharge ink droplets from the nozzles while moving along the head moving direction, for the first segment, based on the interpolation gap information calculated for the first segment by the calculating device; and determine second ink discharging timing with which the inkjet head is to discharge ink droplets from the nozzles while moving along the head moving direction, for the second segment, the second ink discharging timing determined to be the same as when the recording sheet is not deformed in the predetermined wave shape.