Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1990-06-26
1991-08-13
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
138 31, B41J 2175
Patent
active
050399993
ABSTRACT:
Underpressure changes in an ink-jet pen (20, 120) reservoir (22, 122) are compensated for by volumetric changes in the reservoir (22, 122) effected by movement of a piston (56, 156) within a sleeve (50, 150) that is connected to the reservoir (22, 122). The piston (56, 156) and sleeve (50, 150) are sized to provide capillarity for holding ink (72, 172) therebetween. The ink (72, 172) between the piston (56, 156) and sleeve (50, 150) acts as a low-friction seal for preventing fluid communication between ambient air and the interior of the resevoir (22, 122). In one embodiment (120), the volumetric efficiency of the pen is enhanced with an auxiliary ink reservoir carried on the piston (156).
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Robert C. Durbeck et al., (Output Hardcopy Devices, Academic Press 1988) Chapter 13, "Ink Jet Printing" by William J. Lloyd et al.
Hewlett-Packard Journal, vol. 36, No. 5 (May 1985), pp. 1-27.
Anderson Bruce A.
Winslow Thomas H.
Hartary Joseph W.
Hewlett--Packard Company
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