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PRINTHEAD INK SUPPLY CONFIGURATION FOR THE REMOVAL OF AIR TRAPPED IN THE DIE INLET REGION

IP.com Disclosure Number: IPCOM000026920D
Original Publication Date: 1994-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 81K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the current Thermal Ink Jet (TIJ) printhead configuration, there is an air pocket that is difficult to purge by a normal priming technique, especially when the printhead is oriented at an angle of 45 degrees from the horizontal plane. Therefore, it is proposed to use the end jets in a TIJ wafer to purge trapped air by supplying the end jet with a special duct in the upper rear corner of the ink inlet channel where the pocket is formed.

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XEROX DISCLOSURE JOURNAL

PRINTHEAD INK SUPPLY Proposed Classification CONFIGURATION FOR THE US. C1.346/140 REMOVAL OF AIR TRAPPED IN
THE DIE INLET REGION
Robert P. Altavela
Steven F. Pond
Ram S. Narang
Donald M. Stevens

Int. C1. Gold 15/18

20

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994 213

[This page contains 1 picture or other non-text object]

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PRINTHEAD INK SUPPLY CONFIGURATION FOR THE REMOVAL OF AIR TRAPPED IN THE DIE INLET REGION(Cont'd)

In the current Thermal Ink Jet (TIJ) printhead configuration, there is an air pocket that is difficult to purge by a normal priming technique, especially when the printhead is oriented at an angle of 45 degrees from the horizontal plane. Therefore, it is proposed to use the end jets in a TIJ wafer to purge trapped air by supplying the end jet with a special duct in the upper rear corner of the ink inlet channel where the pocket is formed.

As shown in the Figure, there is a printhead 10 comprising an ink supply channel 24, a plurality of ink jets 22, an active purging jet 20, and an ink supply duct 28. The active purging jet 20 is supplied by the ink supply duct 28 in the upper rear corner of the ink supply channel 24. By creating the ink supply duct 28 in an air pocket 26, trapped air is allowed to escape from the pocket during a normal purging and maintenance cycle operation. In an
alternative embodiment, when the purging jet is part of the active array of ink jets 22, the channel would not dry out as...