Patent ID: 6378991
Filing Date: 2002-04-30
Classification: B41J

Abstract:
In a thermal-compression fluid-jetting printing apparatus comprising:a nozzle module having an ink chamber for receiving ink, and a nozzle hole for permitting the ink in the ink chamber to be jetted out therethrough; a driving module forming a working fluid chamber, the driving module having an electric heating element located in the working fluid chamber, the working fluid chamber having an ink-feeding hole through which the ink is fed from an external ink source; and a flexible membrane functioning as a partition between the ink chamber and the working fluid chamber, the membrane being adapted to expand flexibly in response to an increased pressure in the working fluid chamber during a heating operation of the heating element; the improvement comprising: a passage communicating between the working fluid chamber and the ink chamber, said passage adapted for feeding to the ink chamber the ink fed into the working fluid chamber.