| 摘要 |
In an ink jet printer, a print head having a plurality of nozzles, ink cartridges that accommodate respective inks for printing, and ink supply tubes that connect the respective ink cartridges to the print head are provided. The ink cartridges have ink accommodation chambers and air chambers (on which air pressure is exerted) that are separated from each other by flexible film members, respectively. Also provided are an air pump for producing pressurized air, an air supply tube for guiding the pressurized air produced by the air pump to the air chambers, and an orifice for exhausting part of the pressurized air. The orifice is provided in the vicinity of the air-pump-side end of an air supply tube.
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