发明名称 |
Printhead air management using unsaturated ink |
摘要 |
Apparatus for prodding ink to an ink jet print head. The apparatus includes a back pressure regulator for receiving ink from an ink reservoir and for delivering ink to the print head. The regulator has a compliant wall that responds to atmospheric pressure on one side and to the pressure of the ink in the regulator on the another side. Within the regulator is a valve that regulates the pressure of the ink delivered to the print head and is actuated by the wall. Also within the regulator is a compression spring that simultaneously preloads the valve shut and urges the compliant wall against the atmospheric pressure. In an other aspect, an apparatus is provided with a print head having two arrays of nozzles and two back pressure regulators that independently deliver inks of different hues to separate arrays of nozzles on the print head. In still a further aspect, the apparatus performs bi-directional ink jet color printing without hue shift through positioning the regulators and print heads with respect to the printer carriage. <IMAGE> |
申请公布号 |
EP1223039(A1) |
申请公布日期 |
2002.07.17 |
申请号 |
EP20020250179 |
申请日期 |
2002.01.10 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
THIELMAN, JEFFREY L.;WILSON, RHONDA L.;DEVRIES, MARK A.;PAWLOWSKI, NORMAN E., JR. |
分类号 |
B41J2/175 |
主分类号 |
B41J2/175 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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