Automatic nozzle cleaning system for ink ejection printer

Details Automatic nozzle cleaning system for ink ejection printer Automatic nozzle cleaning system for ink ejection printer

1975-12-05

1977-09-20

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1800

Patent

active

040500780

ABSTRACT:
An ink ejection nozzle acts as one electrode and is arranged to eject ink against another electrode during an ink ejection test of the nozzle. The ink stream electrically connects the electrodes when the ink is being ejected normally, whereby the ink flow rate is analogous to the electrical impedance or capacitance between the electrodes. If the nozzle is clogged with an ink deposit so that the flow rate is insufficient, the system ejects a solvent through the nozzle to dissolve the deposit. The flow rate of the solvent is also sensed and the solvent ejection is terminated when the solvent flow rate is sufficient. Ink is then again ejected to purge the solvent from the nozzle.

REFERENCES:
patent: 3596275 (1971-07-01), Sweet
patent: 3761953 (1973-09-01), Helgeson et al.
patent: 3769630 (1973-10-01), Hill et al.
patent: 3893126 (1975-07-01), Ascoli et al.

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