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Brush Rollers for Ribbon Feed

IP.com Disclosure Number: IPCOM000047699D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Findlay, HT: AUTHOR [+2]

Abstract

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.

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Brush Rollers for Ribbon Feed

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. Variations from adhesion, friction and head force are brought under control. Constant force is obtained from combinations of two rotating brush rollers as nip rollers or a brush roller and solid roller as nip rollers. The brush roller at the take-up side rotates slightly faster than the corresponding ribbon speed. The rollers on the supply side rotate counter to the feed direction. A positive drive from a station past the nip-rollers on the take-up side provides a tension sufficient to slip the ribbon through the brush rollers so as to control overall ribbon feed during printing.

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