Inkjet printing machine

An inkjet printing machine comprising:

• an inkjet head that includes a plurality of nozzles arranged along a sub-scanning direction;
• a main-scanning driver that moves the inkjet head in a main-scanning direction orthogonal to the sub-scanning direction;
• a sub-scanning driver that relatively moves the inkjet head and a printing medium in the sub-scanning direction;
• a displacement detector that detects displacement of the inkjet head in the sub-scanning direction;
• and
• a controller that performs a control for printing an image on the printing medium by alternately repeating an operation of discharging ink drops on the printing medium from the nozzles while causing the main-scanning driver to move the inkjet head in the main-scanning direction, and an operation of causing the sub-scanning driver to relatively move the inkjet head and the printing medium in the sub-scanning direction,
• wherein the controller determines the amount of driving by the sub-scanning driver and the number of nozzles to be used among the nozzles in accordance with a maximum amplitude of vibration of the inkjet head in the sub-scanning direction, the maximum amplitude being detected by the displacement detector when the inkjet head is moved in the sub-scanning direction before starting printing, and
• performs printing by selecting at least one nozzle to be used in accordance with displacement of the inkjet head in the sub-scanning direction, the displacement being detected by the displacement detector while the inkjet head is moved in the main-scanning direction.