Patent ID: 7866789

Claim:
An inkjet printing apparatus which uses a printing head for ejecting ink, the inkjet printing apparatus comprising: a plurality of negative pressure generating units, each of which has a cap configured to contact an ejection face of the printing head, a tube connected to the cap, and a roller capable of pressing the tube, each negative pressure generating unit generates a negative pressure in the cap by moving the roller while pressing the tube by the roller; a DC motor which drives the plurality of negative pressure generating units; a control unit which supplies electrical power to control the DC motor; a detecting unit which detects the electrical power supplied from the control unit to the DC motor when the plurality of negative pressure generating units are driven; and a determining unit which determines a position of each of the plurality of rollers relative to the respective tube based on the electrical power detected by the detecting unit, wherein the determining unit determines a phase of each of the plurality of rollers based on a result of the detection by the detecting unit.