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Original Publication Date: 1999-Jun-30
Included in the Prior Art Database: 2004-Apr-09

Publishing Venue

Xerox Disclosure Journal


In an ink jet printer, an ink tank and printhead may be combined into an integral printhead cartridge assembly. With this arrangement, once the ink has been spent, the entire cartridge is replaced. Since the printhead is still useable, this is an inefficient design for many applications. An alternate arrangement is to connect an ink outlet port of a detachable ink tank to a printhead via an ink manifold which includes an ink pipe which is seated within an outlet port. The pipe fluidly connects the ink, typically held in a porous material, typically foam, to the printhead. One problem associated with the detached ink tank design is that, under certain circumstances, ink can be expelled from the tank when the tank is connected to the printhead. This ink may migrate to an area which comes in contact with the user. This problem is particularly associated with ink tanks of the type where the ink tank has multiple chambers, including a front chamber containing the foam material fluidly connected to a rear chamber containing liquid ink. This type of ink tank is shown in the figure. When ink tanks of this type are filled, the entire tank is evacuated and ink is then forced into the rear chamber. Since the front chamber is connected to the rear chamber by an interconnecting passageway, ink also flows into the front chamber saturating the foam from the bottom up and fills a void which is present adjacent the outlet port. At the completion of the process, the foam is saturated with ink near the outlet port and near an air vent. If the tank is then coupled to the printhead via the ink manifold, there is a possibility that some ink will leak from the ink tank outlet or vent. Ink leakage is minimized by the following process.