Apparatus for regulating air pressure in ink tank and ink-supplying system having the same
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United States of America Patent
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Oct 26, 2010
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N/A
app pub date -
Oct 12, 2007
filing date -
Apr 20, 2007
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Abstract
The present invention relates to an apparatus (10) for regulating air pressure in an ink tank (14). The apparatus includes a vacuum pump (12) configured for providing a pressure below atmospheric pressure in the ink tank. A first regulating unit (16), a second regulating unit (18), and a third regulating unit (20) are disposed between the vacuum pump and the ink tank, and in communication with each other. The first regulating unit and the third regulating unit each include a pressure regulating valve and a buffer tank connected with the pressure regulating valve, and the second regulating unit includes a closed-loop pressure regulating valve (180) and a buffer tank (182) connected with the closed-loop pressure regulating valve.
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