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Browse Prior Art Database

Wear Prevention for Print Hammers

IP.com Disclosure Number: IPCOM000044384D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Bayer, RG: AUTHOR [+3]

Abstract

Wear of the faces of print hammers in back printers results from the slight relative motion of the paper caused by the type carrier during impact. Wear is prevented by a thin strip of material interposed between the hammers and the paper. As seen in the figure, a back printer comprises a continuous engraved metal type band 10 and plural print hammers 11 arranged in a row. The print medium located between the hammers 11 and band 10 comprises fabric ink ribbon 12 adjacent band 10 and paper 13 adjacent hammers 11. Printing occurs by hammers 11 impacting paper 13 and ribbon 12 against characters on type band 10 while band 10 is moving at constant velocity. The relatively high abrasive surface of paper 13 causes wearing of the faces of hammers 11 during impact.

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Wear Prevention for Print Hammers

Wear of the faces of print hammers in back printers results from the slight relative motion of the paper caused by the type carrier during impact. Wear is prevented by a thin strip of material interposed between the hammers and the paper. As seen in the figure, a back printer comprises a continuous engraved metal type band 10 and plural print hammers 11 arranged in a row. The print medium located between the hammers 11 and band 10 comprises fabric ink ribbon 12 adjacent band 10 and paper 13 adjacent hammers 11. Printing occurs by hammers 11 impacting paper 13 and ribbon 12 against characters on type band 10 while band 10 is moving at constant velocity. The relatively high abrasive surface of paper 13 causes wearing of the faces of hammers 11 during impact. A strip 14 of low-friction material is interposed between hammers 11 and paper 13. Preferably strip 14 is a thin polymer tape made from material such as polyimide, polyurethane or other low-friction material. Strip 14 may be a base material with low-friction material, such as TEFLON* on the side facing hammers
11. Strip 14 is loosely supported and is thin enough so that print quality is not affected. Strip 14 can be readily removed when worn excessively and may be mounted on a movable support whereby it can be elevated or otherwise shifted to allow hammers 11 to strike paper 13 directly to obtain maximum print quality. * Trademark of E. I. du Pont de Nemours & Co.

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