Needle printing head

Details Needle printing head Needle printing head

1989-10-02

1991-02-26

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 227

Patent

active

049957422

ABSTRACT:
Needle printing head of the permanent magnet type where the armatures of a plurality of printing actuators are attracted, in rest position, against the poles of a permanent magnet and released in printing position by the "cancellation" of the magnetic flux caused by control windings and where the impact of the armatures against the permanent magnet poles, when they return to the rest position is damped by a multilayer element interposed between armatures and magnetic poles and consisting in two thin sheets of magnetic steel between which a thin film of resilient material such as polyester is interposed.

REFERENCES:
patent: 3896918 (1975-07-01), Schneider
patent: 4244658 (1981-01-01), Mori
patent: 4407591 (1983-10-01), Adamoli et al.
patent: 4498791 (1985-02-01), Gilbert
patent: 4674896 (1987-06-01), Yasanuga et al.

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