| 摘要 |
According to one embodiment, an ink supply apparatus supplies ink to a recording head. The ink supply apparatus includes a pump for circulating ink, a first tank for supplying ink to the recording head, a second tank for receiving ink from the recording head, a third tank supplied with ink from an ink supply source, a first pressure adjusting mechanism, arranged between the first tank and the third tank, which is open if the pressure in the first tank is greater than a first given value to discharge ink in the first tank to the third tank, and a second pressure adjusting mechanism, arranged between the third tank and the second tank, which is open if the pressure in the third tank is lower than a second given value smaller than the first given value to draw ink in the third tank into the second tank.
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