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Negating the Effects of Sidewall Contamination in an Aspired Ink Jet Printer

IP.com Disclosure Number: IPCOM000049396D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Feigel, FR: AUTHOR [+2]

Abstract

In ink jet printers of the aspirated type, it is essential to continued operation that a means be used to inhibit sidewall contamination due to stray ink drops impinging upon the wall of the aspirator tunnel. This type of contamination is most prevalent during ink stream and air start up and shut down. Prior attempts to reduce such contamination have included extending the lower high voltage electrode up the non-conductive sidewalls of the tunnel to make the stray ink droplets contact the conductive extensions. In this manner the ink droplets which impinge upon the conductive extensions do not alter the electric field intermediate the high voltage electrodes, thereby inhibiting print drop distortion.

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Negating the Effects of Sidewall Contamination in an Aspired Ink Jet Printer

In ink jet printers of the aspirated type, it is essential to continued operation that a means be used to inhibit sidewall contamination due to stray ink drops impinging upon the wall of the aspirator tunnel. This type of contamination is most prevalent during ink stream and air start up and shut down. Prior attempts to reduce such contamination have included extending the lower high voltage electrode up the non-conductive sidewalls of the tunnel to make the stray ink droplets contact the conductive extensions. In this manner the ink droplets which impinge upon the conductive extensions do not alter the electric field intermediate the high voltage electrodes, thereby inhibiting print drop distortion.

While such a technique is successful, due to the wide variability of head and ink valve combinations, as well as machine errors, the fix is only partially successful. Disclosed is a simple but very effective tunnel construction which avoids the problem of stray drop tunnel sidewall contamination.

By constructing the tunnel of a high resistance material, e.g., carbon-doped NORYL*, of the anti-static class rather than the high insulating material class, the tunnel will draw current and force a reproducible field gradient on the sidewalls of the aspirator.

By constructing the tunnel of a material such as described above, any ink deposited on the sidewalls of the tunnel will form a shunt across...