| 主权项 |
1. An inkjet printer comprising:
a plurality of printing units each comprising
an inkjet head having nozzles for ejecting an ink therefrom,a first tank configured to store the ink to be supplied to the inkjet head,a second tank configured to receive the ink not consumed in the inkjet head,a circulation path configured to allow the ink to circulate among the first tank, the inkjet head, and the second tank,an ink pump configured to feed the ink from the second tank to the first tank, andan ink supply unit configured to supply the ink to the second tank; a negative-pressure adjuster comprising
a negative-pressure common air chamber in communication with the second tanks of the plurality of printing units, anda negative-pressure applying unit configured to apply a negative pressure force to the second tanks of the plurality of printing units and the negative-pressure common air chamber; and a controller configured to control the plurality of printing units and the negative-pressure adjuster, wherein, upon supply of the inks to the second tanks of the plurality of printing units with the second tanks in communication with each other via the negative-pressure common air chamber in an air-tight state and with the negative-pressure force applied to the second tanks and the negative-pressure common air chamber, the controller is configured to drive the ink supply units of the plurality of printing units to supply the inks such that times in which the inks flow into the second tanks in the plurality of printing units do not coincide with each other. |
