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Two-Part Molded Matrix Print Head

IP.com Disclosure Number: IPCOM000043773D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Cross, RG: AUTHOR [+2]

Abstract

A technique is described whereby a multi-wire print head for a matrix printer is molded in only two sections to reduce manufacturing complexity and to simplify the parts involved. Present design requires special pull-outs for undercuts and wire channels. Many parts are involved which cause tolerance build-up problems. The improved design, as shown in Figs. 1-3, provides symmetrical and identical right-hand and left-hand molded outer shell side pieces 10 and 11. Molded center section 12, used conjunctively with the side pieces 10 and 11, makes up the molded head assembly. The side pieces hold a perforated carbide wire guide 13 at the printing end of the head. No pull-outs or undercuts are required in the molded pieces.

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Two-Part Molded Matrix Print Head

A technique is described whereby a multi-wire print head for a matrix printer is molded in only two sections to reduce manufacturing complexity and to simplify the parts involved. Present design requires special pull-outs for undercuts and wire channels. Many parts are involved which cause tolerance build-up problems. The improved design, as shown in Figs. 1-3, provides symmetrical and identical right-hand and left-hand molded outer shell side pieces 10 and 11. Molded center section 12, used conjunctively with the side pieces 10 and 11, makes up the molded head assembly. The side pieces hold a perforated carbide wire guide 13 at the printing end of the head. No pull-outs or undercuts are required in the molded pieces. The center section 12 is made of channels to handle a desired number of wires and provides a guide for either square or round wires, as indicated by the square and round channels 14 and 15, respectively, shown in Figs. 4 and 5. The center section 12 may be molded so as to be able to incorporate a carbide insert positioned midway in the channel path, in the event this is required to reduce wear on the channels.

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