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Blunt Print Tip Wire

IP.com Disclosure Number: IPCOM000050250D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Baker, GN: AUTHOR

Abstract

In certain types of wire matrix printers, it is desirable to have the tips of the wires at a smaller diameter than the actual wire itself. This is necessary where it is desirable to print smaller dots but where making the wire itself small would result in print wire breakage. In the past, the wires have been ground at a shallow angle, such as shown in Fig. 1, where a .014 inch wire was ground to a .009 inch diameter. As seen in fig. 1, typically an angle of approximately 30 degrees had been used by the grinding.

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Blunt Print Tip Wire

In certain types of wire matrix printers, it is desirable to have the tips of the wires at a smaller diameter than the actual wire itself. This is necessary where it is desirable to print smaller dots but where making the wire itself small would result in print wire breakage. In the past, the wires have been ground at a shallow angle, such as shown in Fig. 1, where a .014 inch wire was ground to a
.009 inch diameter. As seen in fig. 1, typically an angle of approximately 30 degrees had been used by the grinding.

By grinding a wire as shown in Fig.1, the wire acted as an arrow in striking against the ribbon, resulting in a very short ribbon This is because the wire penetrated through the ribbon, causing it to life. disintegrate in a short time.

The improvement shown in Fig. 2 increases the angle at the tip of the wire. In using this type of a wire, a more blunt tip has the desired diameter but cannot penetrate through the ribbon as easily as before. In fact, the wire shown in Fig. 2 only penetrates until the contact area balances the forces. It should be noted, however, that the wire shown in Fig. 2 results in a slightly larger dot than the wire shown in Fig. 1.

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