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Improved Printhead-Molding Process

IP.com Disclosure Number: IPCOM000059771D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Herman, RL: AUTHOR [+2]

Abstract

A technique is described whereby tool-locating holes, used in the plastic-molding process of printhead wire guide holders, are eliminated. The technique described herein utilizes opposite end print wire holes as the locating media, instead of requiring separate locating holes. In the manufacture of matrix printheads, carbide insert guides 10, as shown in the figure, are molded into a plastic holder 11. The carbide guides are used to guide print wires during the printing process. In prior art, two separate tooling holes 12 were required to be machined in carbide insert guides 10, utilizing electrode discharge machining techniques.

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Improved Printhead-Molding Process

A technique is described whereby tool-locating holes, used in the plastic- molding process of printhead wire guide holders, are eliminated. The technique described herein utilizes opposite end print wire holes as the locating media, instead of requiring separate locating holes. In the manufacture of matrix printheads, carbide insert guides 10, as shown in the figure, are molded into a plastic holder 11. The carbide guides are used to guide print wires during the printing process. In prior art, two separate tooling holes 12 were required to be machined in carbide insert guides 10, utilizing electrode discharge machining techniques. This expensive approach is now eliminated through the use of the already present holes #1 and #17 in carbide insert guide 10, as the media for holding carbide insert guide 10 during the injection-molding process. Tooling wires are used to pass through holes #1 and #17, for location purposes, during the molding operation. Also, by eliminating tooling holes 12, the problem of ribbon fibers filling the holes has been eliminated. This had caused smudging to occur during the printing operation.

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