Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1980-05-06
1982-09-07
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, B41J 312
Patent
active
043481205
ABSTRACT:
A printer head for mosaic printing having a plurality of needles positioned on a straight line each being selectively driven towards a paper through an ink ribbon has been found. The printer head comprises of a cylindrical permanent magnet, a first yoke covering the bottom of the permanent magnet, a plurality of electromagnets each positioned on a circle on the first yoke with the predetermined angle intervals, a disk shaped spring having an outer ring and a plurality of projections towards the center of the disk, a plurality of armatures each attached to the related projection of the disk spring, a plurality of print needles each attached to the related projection of the disk spring so that each of the needles has the perpendicular component to the disk spring plane. A ring shaped spacer is positioned between the disk spring and the cylindrical permanent magnet, a second yoke for providing a magnetic flux path is positioned between the permanent magnet and each of the electromagnets, and a guideframe having a thin linear slit for arranging the top of said needles and covering the needles is provided.
REFERENCES:
patent: 3770092 (1973-11-01), Grim
patent: 3876050 (1975-04-01), Linder
patent: 3896918 (1975-07-01), Schneider
patent: 3941051 (1976-03-01), Barrus et al.
patent: 4222674 (1980-09-01), Mori et al.
patent: 4225250 (1980-09-01), Wagner et al.
Isobe Minoru
Kikuchi Hiroshi
Kodama Tadasi
Ohara Wataru
Teshima Minoru
Nippon Telegraph & Telephone Public Corporation
Oki Electric Industry Co. Ltd.
Sewell Paul T.
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