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Removal of Electrode Deposits Disclosure Number: IPCOM000087781D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

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Kotla, JJ: AUTHOR [+2]


A technique for removal of charge electrode deposits in an ink jet printing system is described.

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Removal of Electrode Deposits

A technique for removal of charge electrode deposits in an ink jet printing system is described.

Precipitates have been found to form on metal electrodes exposed to ink during passage of direct electric currents such as the current conditions present when charging ink jet drops. The presence of such deposits may cause reduced and variable drop charging efficiency, plugging of charge electrodes, misdirected ink streams and inferior print quality. These precipitates are typically insoluble and very tenacious.

To remove these deposits, the polarity of direct current, which has been applied to the charge electrodes during deposit formation, is reversed so that the electrode which previously was the cathode becomes the anode and the electrode which was previously the anode becomes the cathode. The application of a few volts between these electrodes, in the presence of an electrolyte containing no pigments or dyes, produces a current flow so that the precipitates are easily and completely removed within a short time. The removal of these deposits may be accomplished in the ink jet printing system or at a separate location. One suitable electrolyte is a "dyeless ink" solution which is the normal ink formulation without the coloring pigments or dyes. Similar deposits can result from the direct electric current associated with deflection of charged ink jet drops.

These can also be removed, as described above. Thus, the described technique fun...