Brush Rollers for Ribbon Feed
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Control of ribbon feed irregularities is achieved by brush rollers in a nip-roller station on each side of the printhead. Where the printer is a thermal one in which the printhead holds the ribbon against paper, as shown in the drawing, friction problems are intensified. In such a system, variations in adhesion during transfer, as well as continuous surface friction, are inherent in the various ribbon materials used. These add to the friction forces between the printhead and the back of the ribbon. Where the printhead is moving faster than the intended ribbon speed, the added forces can exceed the restraining forces, thus speeding up ribbon velocity. The nip-roller stations on each side of the printhead exert a constant force on the take-up side and the feed side.