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Color-On-Demand Printing

IP.com Disclosure Number: IPCOM000040229D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR

Abstract

Resistive ribbon printing is known in which an electrical current in a ribbon produces localized heating to melt a small area of an ink layer, the melting ink then transferring to a recording sheet, such as paper. A color-on-demand technique for color printing using a resistive ribbon is described in U.S. Patent 4,253,775. In that technique, the ribbon is essentially colorless and the desired pigment is added to it in the printer just prior to the printing operation. This article describes another approach for toning a ribbon to provide the desired color. The ink layer on the resistive ribbon is a dielectric and can be made tacky at elevated temperatures. Being a dielectric, it can be electrostatically charged and toned in the printer environment.

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Color-On-Demand Printing

Resistive ribbon printing is known in which an electrical current in a ribbon produces localized heating to melt a small area of an ink layer, the melting ink then transferring to a recording sheet, such as paper. A color-on-demand technique for color printing using a resistive ribbon is described in U.S. Patent 4,253,775. In that technique, the ribbon is essentially colorless and the desired pigment is added to it in the printer just prior to the printing operation. This article describes another approach for toning a ribbon to provide the desired color. The ink layer on the resistive ribbon is a dielectric and can be made tacky at elevated temperatures. Being a dielectric, it can be electrostatically charged and toned in the printer environment. Furthermore, the toners can be fused with the ink following the toning process. The electrostatic charging can be done either in blocks, which would qualify the method for color accent printing, or pel by pel, which would qualify it for APA color printing. The color toners can be obtained from various suppliers of toners for color xerography. Alternatively, magnetic toners can be applied to the ribbon surface by hot electromagnets placed on the conductive side of the ribbon across from a toning chamber on the ink side of the ribbon. When the hot electromagnet is activated and placed in contact with the ribbon, toner particles are attracted and get stuck (tacky surface) to the ink. Subsequently,...