Ink ejection apparatus

Details Ink ejection apparatus Ink ejection apparatus

1980-01-18

1981-11-17

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

043014607

ABSTRACT:
An ink ejection apparatus comprising an ink ejection unit having a liquid chamber connected to an ink container through a conduit and an air chamber connected to a source of pressurized air. Axially aligned discharge channels are provided to allow the ink in the liquid chamber to be discharged through the discharge channels. A piezoelectric transducer is mounted adjacent to the liquid chamber to generate rapid pressure increases therein to permit ejection of ink droplets to the atmosphere in response to electrical signals. The ink container is also supplied with the pressurized air from the air supply source so that there is a constant stream of air through the discharge channel and there is a static pressure balance between the air and liquid chambers when the air supply source is in operation. To eliminate the problem of pressure imbalance which could occur at the instant the air supply source is energized or de-energized, an arrangement is provided to impart a retarding action to the transitory variation of the pressure in the conduit.

REFERENCES:
patent: 4106032 (1978-08-01), Miura
patent: 4223324 (1980-09-01), Yamamori

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