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Resistive Ribbon Printhead Angle

IP.com Disclosure Number: IPCOM000040163D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Byrne, JC: AUTHOR [+2]

Abstract

In resistive ribbon printing in which a printhead column of electrodes applies current to a ribbon which is heated internally by the current, the printhead angle with the platen can reduce differential wear, thereby potentially prolonging the useful life of the printhead. U.S. Patents 4,384,797 and 4,575,731 are illustrative of such resistive ribbon printing. The drawing shows a printhead 1 and a round, conventional platen 3 at a 60o angle. A typical angle is 45o, as shown in dotted outline. Printhead 1 contains a column of electrodes 5, typically 40 individual print electrodes, seen from the top in the drawing. During ordinary printing of characters, some of the electrodes 5 are operated more than others and those operated more experience greater wear.

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Resistive Ribbon Printhead Angle

In resistive ribbon printing in which a printhead column of electrodes applies current to a ribbon which is heated internally by the current, the printhead angle with the platen can reduce differential wear, thereby potentially prolonging the useful life of the printhead. U.S. Patents 4,384,797 and 4,575,731 are illustrative of such resistive ribbon printing. The drawing shows a printhead 1 and a round, conventional platen 3 at a 60o angle. A typical angle is 45o, as shown in dotted outline. Printhead 1 contains a column of electrodes 5, typically 40 individual print electrodes, seen from the top in the drawing. During ordinary printing of characters, some of the electrodes 5 are operated more than others and those operated more experience greater wear. (Electrodes which experience the greater use and therefore the greater wear typically are those which coincide with horizontal lines in characters, often occurring at the center, top, and bottom of characters.) A progressive reduction in such differential wear is experienced for the higher angles. The end of the printhead is configured for each angle to match the curved surface of the platen for even contact of the electrodes 5. The higher angle results in bending stresses during operation which must be controlled by appropriate design factors of printhead 1.

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