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Interposing Films to Increase Typewriter Print Character Spread

IP.com Disclosure Number: IPCOM000074154D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Bailey, WD: AUTHOR [+5]

Abstract

To change from a fine to a bold printing type style requires a type element change on the IBM SELECTRIC* typewriter. This method of laminating film will increase character spread without a type element change. Here the concern lies solely with promoting character spread as bold type while maintaining high quality edge definition, particularly on commonly used soft bond paper. It has been found that by increasing the caliper of the interposing films above 0.0010'', a corresponding increase in character spread occurs that is easily discernible without optical aids. This method makes it possible to emphasize any word or number by increasing character spread equal to or greater than that obtained by a type element change and without color change.

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Interposing Films to Increase Typewriter Print Character Spread

To change from a fine to a bold printing type style requires a type element change on the IBM SELECTRIC* typewriter. This method of laminating film will increase character spread without a type element change. Here the concern lies solely with promoting character spread as bold type while maintaining high quality edge definition, particularly on commonly used soft bond paper. It has been found that by increasing the caliper of the interposing films above 0.0010'', a corresponding increase in character spread occurs that is easily discernible without optical aids. This method makes it possible to emphasize any word or number by increasing character spread equal to or greater than that obtained by a type element change and without color change.

As shown in B, two 1.0 mil. films, 1 of polyurethane are laminated together with a 0.3 mil. film, 2 of acrylonitrile butadiene (CHEMIGUM** N612B). As shown in A, this laminated film 5, when suspended equidistant between the typehead 3 and ribbon 4 at an impression setting of five, can be typed on in excess of 400 times with the same character on the same spot without effecting cutting. This same polyurethane laminate adhered directly on the back of a ribbon shows the usual cut performance improvement of all such laminates, but is still nowhere near the repeated overstrike capability of the suspended laminate. Fabrication of the film laminate follows standard coa...