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Wire Printhead Electrodes for Extend Use

IP.com Disclosure Number: IPCOM000038883D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Banks, BR: AUTHOR [+4]

Abstract

Differential wear limits the life of resistive printheads, such as a printing system described in U.S. Patent 4,408,908. Differential wear refers to the difference in wear rate between electrodes that are frequently powered and those which are not. Because of the geometry of the printhead and conventional round platen interface, differential wear results in unacceptable print quality after substantially shorter usage than the intrinsic life of the used electrode. Elimination or reduction of differential wear could result in a much-extended useful period. A printhead of different wire electrodes can provide even wear. In resistive ribbon printing, a column of electrodes in a printhead contacts the back of the ribbon and drive current selectively into the ribbon.

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Wire Printhead Electrodes for Extend Use

Differential wear limits the life of resistive printheads, such as a printing system described in U.S. Patent 4,408,908. Differential wear refers to the difference in wear rate between electrodes that are frequently powered and those which are not. Because of the geometry of the printhead and conventional round platen interface, differential wear results in unacceptable print quality after substantially shorter usage than the intrinsic life of the used electrode. Elimination or reduction of differential wear could result in a much-extended useful period. A printhead of different wire electrodes can provide even wear. In resistive ribbon printing, a column of electrodes in a printhead contacts the back of the ribbon and drive current selectively into the ribbon. Differential wear results from additional wear mechanisms that are present when current is passing through the electrode/ribbon interface. Many mechanisms, including electrolytic dissolution, electroerosion, heating and the like, may be present. These may vary depending on the choice of electrode material and type of printing. This problem of differential wear is resolved empirically by selection of the characteristics of each electrode. The individual electrodes are made of wires, circular or flattened, which are imbedded in a polymeric layer. The different electrodes are made of different metals or alloys. A number of electrode material candidates may be ranked ac...