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METHOD FOR EVACUATING, FILLING AND PRIMING THERMAL INK JET PRINTHEADS

IP.com Disclosure Number: IPCOM000027350D
Original Publication Date: 1996-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 142K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed are two methods for use in manufacturing thermal ink jet printheads which enable removal of air fiom within a thermal ink jet printhead during the filling of the cartridge. The methods are: (1) evacuate through the fiont face and subsequently fill with ink, and (2) evacuate the entire unit by placing in a vacuum chamber and then fill with ink.

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XEROX DISCLOSURE JOURNAL

METHOD FOR EVACUATING, FILLING

ANDPIUMINGTHERMALINKJET U. S. C1.346/075 PRINTHEADS
Daniel E. Khan
Almon P. Fisher
Steven J. Dietl
David P. Breemes

Proposed Classification

ht. C1. GO1 d 15/18

Disclosed are two methods for use in manufacturing thermal ink jet printheads which enable removal of air fiom within a thermal ink jet printhead during the filling of the cartridge. The methods are: (1) evacuate through the fiont face and subsequently fill with ink, and (2) evacuate the entire unit by placing in a vacuum chamber and then fill with ink.

METHOD 1

(1) The ink jet cartridge, having been assembled to the level such that the filter foam
around the "tub" has been inserted along with three levels of reservoir wicks is moved into a priming station. A gasket on the priming station makes an air tight seal around the face of the die module bonded to the Cartridge heat sing.

(2) A temporary lid is lowered down onto the cartridge. This lid has a spring-loaded pin attached to its bottom surface. A stopper at the end of the pin made of a suitable sealing material (e.g., rubber or other elastomer) pushes down the reservoir wicks until, through proper alignment, contact is made with the top opening of the vent stack, thereby sealing the vent. Alternatively, this pin may be omitted if a suitable seal is made at the bottom of the vent stack on the underside of the cartridge. The temporary lid is lowered until an airtight seal is made to the cartridge, accomplished by use of a sealing gasket on the bottom side of the temporary lid. The temporary lid contains components to enable air
evacuation and ink filling of the cartridge.

(3) After the appropriate air tight seals are made, a vacuum valve (V) is opened and air is evacuated fiom the cartridge.

XEROX DISCLOSURE JOURNAL - Vol. 2 1, No. 3 May/June 1996 191

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METHOD FOR EVACUATING, FILLING AND PRIMING THERMAL INK JET
PmH&%.Ds (CONT'D)

(4) Upon completion of the evacuation cycle, the vacuum valve is closed; the priming valve is opened and a fill valve is opened. This allows ink to be introduced into the cartridge.

(5) Upon completion of the filling cycle, the fill valve is closed and after a short duration, the priming valve is closed, completing the priming cycle.

(6) The temporary lid is removed and the cartridge retracted fiom the priming station.

The preceding sequence serves to effectively remove air from the printhead allowing for less occurrence of jet dro...