| 摘要 |
In a printer, to clean a recording head, a nozzle is sealed by a cap member, and a gear pump is driven with one circulation system formed. Waste ink and air sucked from the cap member flows through the cap member, a check valve, a tube, the gear pump, and a tube, in that order, and then flows into a first cartridge. In this process, the air flows into a second cartridge through a tube as pressurized air. The waste ink and the pressurized air are prevented by the check valve from flowing back to the cap member side. The structure reduces back flow of a liquid and air and enables to realize optimum ink jetting.
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