Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1988-12-22
1991-02-12
Reynolds, Bruce A.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346 75, 346140R, G01D 1518
Patent
active
049928023
ABSTRACT:
An ink jet print cartridge includes an ink reservoir, a print head for ejecting ink from the reservoir and first and second pressure control mechanisms for limiting the reservoir underpressure. The first pressure control mechanism limits reservoir underpressure by controllably introducing replacement fluid (i.e. air or ink) thereto. The second pressure control mechanism limits reservoir underpressure by changing the volume thereof. The two pressure control mechanisms cooperate to regulate the underpressure in the reservoir at a desired value over a broad range of environmental excursions and permit use of a volumetrically efficient package.
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Dion John H.
Winslow Thomas H.
Hewlett--Packard Company
Preston Gerald E.
Reynolds Bruce A.
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