| 摘要 |
An ink jet recorder includes an ink jet head having a nozzle, which can be capped with a cap and a suction pump for purging the nozzle through the cap. The recorder further includes a pressure control unit interposed between an ink supply and the head to control the pressure on the ink in the nozzle. At least just before purging finishes, the control unit applies positive pressure to the ink in the nozzle to prevent the air bubbles, the foreign substances and/or the like sucked into the cap by the pump from flowing back into the head. The control unit may include an ink tank and a height adjuster for adjusting the height of the tank relative to the front end of the nozzle.
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