Browse Prior Art Database

Low Cost Wire Missile Design for a Wire Matrix Printhead

IP.com Disclosure Number: IPCOM000046130D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Kulterman, RW: AUTHOR [+3]

Abstract

In wire matrix printheads, patterns are formed by a matrix of wire missiles driven by actuators. The present structure is designed to provide a wire matrix missile structure of lower cost and greater reliability than conventional missiles.

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Low Cost Wire Missile Design for a Wire Matrix Printhead

In wire matrix printheads, patterns are formed by a matrix of wire missiles driven by actuators. The present structure is designed to provide a wire matrix missile structure of lower cost and greater reliability than conventional missiles.

With respect to the wire missile structure in Fig. 1, wire 11 is fastened to missile 12 with tail stock 13 molded onto the assembly of wire 11 and missile 12. Strain relief 14 may be a polymeric material, such as an epoxy resin. The key to the present invention is in the assembly of the structure shown in Fig. 1. Missile 12 is formed by a metal injection molding process. In this process, wire 11 is inserted into the mold for missile 12. During the zinc molding process, missile 12 is formed and consequently locked on to wire 11 by thermal contraction. Next, the wire and missile assembly is inserted into a polymeric injection mold and tail stock 13 is molded onto the assembly; tail stock 13 is mechanically locked to missile 12 by the shape of missile 12. Strain relief member 14 can also be molded at this time. However, the strain relief material is usually a different polymer from the one used for the tail stock so that a two-shot molding process would be desirable.

Preferably, the missile is formed by two injection molding processes: one wherein the zinc missile is molded together with the wire, and the other wherein the polymeric tail stock is molded onto the assembly. A...