Wire Printhead Electrodes for Extend Use
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
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.