| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to stably supply an ink for a long time.SOLUTION: When a difference between a liquid level TL1 of an upstream side tank 11 and a liquid level TL2 of a downstream side tank 12 is equal to or more than a threshold Lth1 or equal to or less than a threshold Lth2, a liquid level adjustment pump P3 is operated thereby performing a control such that the liquid levels TL1, TL2 of the upstream side tank 11 and the downstream side tank 12 are coincident with each other. Consequently, even if an ink jet device 1 is used for a long time, contamination of air bubbles into an ink 70 circulating along a circulation path C1, which may occur due to overflowing of the ink from the upstream side tank 11 or the downstream side tank 12 and lowering of the liquid levels, can be prevented. Therefore, the ink jet device 1 can be used stably for a long time.</p> |
