# US 5,344,243 A · Head wire and manufacturing process thereof

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- Number: US 5,344,243 A
- Document ID: US5344243A
- Status: Granted
- Kind: A
- Application number: 08/003,198
- Filed: 1993-01-11
- Granted: 1994-09-06
- Earliest claimed: 1991-06-18
- Assignees: International Business Machines Corporation; Krd Corporation
- Inventors: Tsutomu Sawa; Hiroyuki Takenoshita; Kohei Shibata; Hirohide Komatsu
- Web page: https://patentgrep.com/patent/US5344243A

## CPC

- B41J 2/25: Print wires
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A head wire for use in a high-speed impact dot matrix printer head, having an elongated body, made of a high speed steel wire material or titanium alloy wire material. One end of the body is connectable to an armature of the printed head and a second end on an ink ribbon for printing characters on a paper material. The second end has a coating formed around its periphery and consists of a ceramic hard titanium compound or an aluminum oxide.

## Claims

### Claim 1

A head wire for use in a high-speed impact dot matrix printer head including an armature, said head wire, comprising:
an elongate body formed of one of a high speed steel wire material and a titanium alloy wire material;
a first end connectable to the armature and a second end having an end surface for printing characters on a paper material by acting on an ink ribbon arranged above the paper material; and
a coating formed around only the perimetric periphery of said second end, wherein said end surface is not coated, said coating comprises one of a ceramic hard titanium compound and an aluminum oxide.

### Claim 2 (depends on 1)

The head wire according to claim 1, wherein said coating has a thickness of about 1 micron to 5 microns..