Resistive Ribbon Printhead Angle
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-01
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.