| 摘要 |
PROBLEM TO BE SOLVED: To stabilize an operation of ink ejection by an ink jet print head. SOLUTION: One or more mechanisms for controlling current of ink are provided to an upstream side of an ink ejection mechanism in the print head. The current of the ink is forcedly controlled to be stabilized at the operational timings of the mechanisms, thereby controlling the ejection force of the ink and the operation at the refilling.
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