Method and inkjet printer for acquiring gap information

An inkjet printer comprising:

• an inkjet head configured to discharge ink droplets from nozzles formed in an ink discharging surface thereof;
• a head scanning unit configured to reciprocate the inkjet head relative to a recording sheet along a scanning 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 tops of portions protruding in a first direction toward the ink discharging surface and bottoms of portions recessed in a second direction opposite to the first direction, the tops and the bottoms alternately arranged along the scanning direction;
• a gap information acquiring unit configured to acquire gap information related to a gap between the ink discharging surface and each individual one of the tops and the bottoms on the recording sheet;
• and
• a determining unit configured to determine whether the gap information acquired for each individual one of the tops and the bottoms on the recording sheet is abnormal.

An inkjet printer comprising:

• an inkjet head configured to discharge ink droplets from nozzles formed in an ink discharging surface thereof;
• a head scanning unit configured to reciprocate the inkjet head relative to a recording sheet along a scanning 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 tops of portions protruding in a first direction toward the ink discharging surface and bottoms of portions recessed in a second direction opposite to the first direction, the tops and the bottoms alternately arranged along the scanning direction;
• and
• a control device configured to:
• acquire gap information related to a gap between the ink discharging surface and each individual one of the tops and the bottoms on the recording sheet;
• and
• determine whether the gap information acquired for each individual one of the tops and the bottoms on the recording sheet is abnormal.