# US 4,393,771 A · Printing head for a printer

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- Number: US 4,393,771 A
- Document ID: US4393771A
- Status: Granted
- Kind: A
- Application number: 06/324,637
- Filed: 1981-11-24
- Granted: 1983-07-19
- Earliest claimed: 1980-11-25
- Assignees: Ye Data Inc.
- Inventors: Juichi Tatsumi
- Web page: https://patentgrep.com/patent/US4393771A

## CPC

- B41J 2/28: of spring charge type, i.e. with mechanical power under electro-magnetic control
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A permanent magnet type printing head for an impact dot printer wherein a plate spring hammer has a hammer tip provided on one side thereof, and an attracting magnetic pole provided with a releasing electromagnetic coil arranged on the side opposite said hammer, wherein an armature is provided on the upper surface of the plate spring hammer instead of providing same on the same side of a magnetic pole, and wherein an arm of a yoke constituting a main magnetic path is provided on the plate spring hammer, and the magnetic pole is positioned between the hammer tip and the armature.

## Claims

### Claim 1

In permanent magnet type printing head for an impact dot printer wherein a plate spring hammer has a hammer tip provided on one side thereof, and an attracting magnetic pole provided with a releasing electromagnetic coil arranged on another side opposite said hammer, the improvement comprising an armature disposed on the side where said hammer tip of said plate spring hammer is provided, and a yoke formed with a through hole or notch within which said armature is movable, said attracting magnetic pole being arranged between said hammer tip and said armature.

### Claim 2 (depends on 1)

A printing head for a printer according to claim 1, wherein the armature is in the form of a cup.