| 摘要 |
An ink jet printer is provided with an ink circulation route in which are arranged an ink jet head for ejecting ink, a first tank for supplying ink to the ink jet head, a second tank for collecting ink which is not consumed by the ink jet heads. The ink jet printer comprises a measuring unit operable to obtain a value indicative of the flow resistance measured when ink flows the first tank to the second tank through the ink jet head; and a control unit operable to select one of maintenance operations on the basis of the value indicative of the flow resistance as obtained. Particularly, when the value indicative of the flow resistance as obtained is lower than a predetermined value, the control unit selects the operation of circulating ink around the ink circulation route as the one of maintenance operations, and the maintenance unit does not perform the maintenance operation which consumes some amount of ink. By this configuration, it is possible to perform maintenance in accordance with the ink viscosity by a simple structure.
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