Inkjet device and controlling method for inkjet device

A control method for an inkjet recording device having an inkjet head that is equipped with a nozzle for discharging ink, comprising:

• adjusting a pressure applied to ink inside a flow path that supplies ink to the inkjet head to a first positive pressure;
• wiping a surface of the nozzle;
• adjusting the pressure applied to the ink inside the flow path to a first negative pressure;
• wiping the surface of the nozzle;
• and
• adjusting the pressure applied to the ink inside the flow path to a second negative pressure that is smaller than the first negative pressure.

An inkjet recording device comprising:

• an inkjet head having an ink discharge nozzle;
• an ink flow path to the inkjet head;
• a pressure adjustment valve installed along the ink flow path;
• a maintenance unit configured to wipe the ink discharge nozzle;
• and
• a controller configured to:
• control the pressure adjustment valve to adjust the pressure inside the flow path to a first positive pressure and then cause the maintenance unit to wipe the ink discharge nozzle, and control the pressure adjustment valve to adjust the pressure inside the flow path to a first negative pressure and then cause the maintenance unit to wipe the ink discharge nozzle, and
• control the pressure adjustment valve to adjust the pressure inside the flow path to a second negative pressure that is smaller than the first negative pressure.