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Programmable Color Printing and Paper Therefor

IP.com Disclosure Number: IPCOM000078587D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Kelisky, RP: AUTHOR

Abstract

In data-processing apparatus, it is well known to employ program-controlled impact printers to produce a single color, generally black print only. However, there are many situations wherein the capability of differentiating between symbols by color, as well as shape, could significantly facilitate the understanding of some complex process, i.e., the debugging of an output program or the marking of words or symbols which have become changed in their nature, location or meaning during some process. Thus, for example, the comparison of two different memory dumps could be markedly simplified, if those locations which had changed between the first and second printings were now to be printed in some other color on the second printing.

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Programmable Color Printing and Paper Therefor

In data-processing apparatus, it is well known to employ program-controlled impact printers to produce a single color, generally black print only. However, there are many situations wherein the capability of differentiating between symbols by color, as well as shape, could significantly facilitate the understanding of some complex process, i.e., the debugging of an output program or the marking of words or symbols which have become changed in their nature, location or meaning during some process. Thus, for example, the comparison of two different memory dumps could be markedly simplified, if those locations which had changed between the first and second printings were now to be printed in some other color on the second printing. In addition, the editing time required for a lengthy document could be substantially reduced by a process, in which changes from version-to-version were shown in color.

In this description, data-processing system output printing with programmable color selection is achieved without the need for photosensitive paper or film, and consequently without the concomitant need for chemical developers and fixatives. Also, the programmable color selection is achieved without the need for the conventional inked ribbon and its associated ribbon handling mechanism.

In accordance with this description, an impact printer is modified such that the force with which the type slug strikes the page is program controllable and such that, the type slug, under program control, strikes the paper with distinct discrete forces f(1),f(2),f(3),...,f(n), such that f(1)<f(2)<f(3)<...<f(n).

A suitable paper to be used is a pressure-sensitive paper. When this type of paper is subjected to sufficient pressure to activate the color producing mechanis...