INK-JET RECORDING DEVICE

PROBLEM TO BE SOLVED: To provide an ink-jet recording device always assuring a stable state of the device by avoiding precipitation of ink in an ink-supply pipe, an ink tank and a print head. SOLUTION: The ink jet recording device comprises a first ink circulation path provided with an ink-supply passage which introduces the ink into a recording head from a sub-tank of ink through the first solenoid valve, the second solenoid valve, a filter unit and a three-way valve with the above order and has a sealed structure including the sub-tank not allowing the ink to get into contact with air and arranged via the recording head side of the first solenoid valve installed nearer to the recording side installed than the sub-tank of ink branching from the filter unit, the three-way valve installed nearer to the recording head side than the filter unit and the second ink-circulating route arranged so that the ink can flow from the inlet arranged on one side of the internal common passage of the recording head to the inlet on other side through the internal common passage and enables to circulate. COPYRIGHT: (C)2005,JPO&NCIPI