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Coded Wire Matrix Print Head

IP.com Disclosure Number: IPCOM000049635D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Floyd, RK: AUTHOR [+2]

Abstract

This article describes a wire matrix print head in which the wires forming the matrix are coated with a coating, which prevents adhesion, such as a tetrafluoroethylene coating or a silicone coating. In addition, manufacturing processes are provided wherein the wires of the print head are coated with the coating after forming the wires into a complete wire matrix print head which is then dipped into the coating bath.

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Coded Wire Matrix Print Head

This article describes a wire matrix print head in which the wires forming the matrix are coated with a coating, which prevents adhesion, such as a tetrafluoroethylene coating or a silicone coating. In addition, manufacturing processes are provided wherein the wires of the print head are coated with the coating after forming the wires into a complete wire matrix print head which is then dipped into the coating bath.

In wire matrix printers, there have been conventional problems with dried ink occurring during periods when the machine is idle. The ink tends to build up on the wires of the matrix which clogs the wire passages and produces excessive drag on the wires. The ultimate results of such sticking wires are paper snags and bent wires which require a total replacement of the print head.

A standard approach involves feeding oil to the print wires from a reservoir along a wick path. It has been found that the oil wick approach gives less than a uniform transfer of lubricant to the wires. In addition, the oil reservoir appears to be easily separable from the equipment, resulting in a loss of lubrication.

Silicone or tetrafluoroethylene coatings appear to minimize this problem. The best approach to coating the print wires is to dip the print wires into the coating bath. This method has been particularly successful when used on print wires which have already been assembled into the print head assembly. The entire print head face is dip...