Patent ID: 7131720

Claim:
An inkjet printer comprising: ink cartridges which reserve ink supplied to an inkjet head; a pressurized air generating device which generates pressurized air supplied to the ink cartridges; an air discharge device which discharges air accumulated in supplying paths of the ink with the pressurized air; and an ink vacuum device which vacuums the ink from the inkjet head, wherein: the pressurized air generating device comprises a high pressure mode to generate pressurized air at predetermined pressure P 1 and a low pressure mode to generate pressurized air at pressure P 2 which is lower than the pressure P 1 , the pressurized air generating device is adapted to be in the high pressure mode when the air discharge device is used, and the pressurized air generating device is adapted to be in the low pressure mode to pressurize the ink when the ink vacuum device is used, and the ink is pressurized by the pressurized air generating device at least by a time when a vacuum of the ink is terminated in a usage of the ink vacuum device.