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Wire Matrix Print Head

IP.com Disclosure Number: IPCOM000089776D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Belvin, RL: AUTHOR [+3]

Abstract

Wire matrix print head mechanisms of some designs require flexure of the impact transmitting wire from the driving armature to the exit point in the print head adjacent the media to be struck. Hard and wear-resistant materials are often chosen for such wires, and particularly the tips of the wires, because repeated impact and friction with media wear away the ends of the wires and degrade printing quality. Tungsten carbide print wires which are often used, suffer from breakage due to the low flexural strength of tungsten carbide material. This aspect of wire matrix printers reduces their reliability, and causes expensive repair and maintenance problems in some instances.

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Wire Matrix Print Head

Wire matrix print head mechanisms of some designs require flexure of the impact transmitting wire from the driving armature to the exit point in the print head adjacent the media to be struck. Hard and wear-resistant materials are often chosen for such wires, and particularly the tips of the wires, because repeated impact and friction with media wear away the ends of the wires and degrade printing quality. Tungsten carbide print wires which are often used, suffer from breakage due to the low flexural strength of tungsten carbide material. This aspect of wire matrix printers reduces their reliability, and causes expensive repair and maintenance problems in some instances.

The present article describes a method of manufacturing wire matrix print heads which overcomes the breakage problem of the tungsten carbide wires. In the present design, a flexible steel tube is utilized to transmit the printing stroke from the driving armature through a wire guide body to an output end, and the end of the hollow steel tube has press-fitted into it a tungsten carbide rod as an impact tip. The hollow steel tube has high flexural strength, and takes all of the flexural loads imposed in the structure. The wire guide body is constructed so that the vertical spacing V of the apertures in the front end of the guide body is that required for the diameters of the tungsten carbide wire tip inserts into the tubing.

This eliminates any vertical spacing between the wire ends at impact.

The horizontal spacing H is that requ...