Accumulator and pressure control for ink-ket pens

Recorders – Markers and/or driving means therefor – With ink supply to marker

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Details

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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Hewlett-Packard Journal, vol. 36, No. 5 (May 1985), pp. 1-27.

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