Browse Prior Art Database

Aspirated Ink Stream Auto Alignment

IP.com Disclosure Number: IPCOM000052735D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Pan, RF: AUTHOR

Abstract

In present aspirated ink jet printing, the ink stream is subject to change in orientation when the forced air flow is introduced. This phenomenon is called ""stream bending''. The magnitude and direction of stream bending is unpredictable from aspirator to aspirator. Therefore, it causes stream guttering problems. For example, if the ink stream bends downwardly when the air flow is introduced, the trajectory of ink drops at low raster points (for example, the bottommost portions of the alpha-numeric characters being printed) is influenced or even blocked by the top of the gutter. Alternatively, if the ink stream bends up, it may overshoot the gutter, causing unwanted drops to be placed upon the print-receiving medium (paper).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 65% of the total text.

Page 1 of 2

Aspirated Ink Stream Auto Alignment

In present aspirated ink jet printing, the ink stream is subject to change in orientation when the forced air flow is introduced. This phenomenon is called ""stream bending''. The magnitude and direction of stream bending is unpredictable from aspirator to aspirator. Therefore, it causes stream guttering problems. For example, if the ink stream bends downwardly when the air flow is introduced, the trajectory of ink drops at low raster points (for example, the bottommost portions of the alpha-numeric characters being printed) is influenced or even blocked by the top of the gutter. Alternatively, if the ink stream bends up, it may overshoot the gutter, causing unwanted drops to be placed upon the print- receiving medium (paper).

Accordingly, it is desirable to employ a self-aiming technique such that for each aspirator, the aspirated ink stream may reach a fixed location in the gutter.

Turning now to the drawing, Figs. 1 and 2 show schematically an aspirator 10 of an ink jet printer, the aspirator having air and ink propelled therethrough. The ink stream 11, illustrated in Fig. 1, is too low after the air has been turned on, while the one illustrated in Fig. 2 is at the proper location.

In order to achieve proper stream orientation despite the ""stream bending'' phenomenon, a stream sensor 12 is preferably placed so that when the ink stream passes therethrough it will hit a predetermined and preaimed point in the gutter 14.

In op...