High speed electromagnetic printing head

Details High speed electromagnetic printing head High speed electromagnetic printing head

1977-11-11

1979-01-30

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 335279, B41J 312

Patent

active

041369785

ABSTRACT:
A high speed printing head comprises a circular array of stylii drivers for printing characters in a dot matrix format. Each driver includes a permanent magnet and bucking coil electromagnet which when energized causes a stylus to impact a printing surface. The stylus is carried on the end of an arm supported by crossed horizontal and vertical supporting flexures at its other end whereby the arm pivots about a virtual axis lying near the plane of the working air gap of the electromagnet to reduce wear of the pole piece and armature and increase impact rebound of the arm. The magnetic structure and arm structure intersect only above the pole piece reducing flux leakage and size and weight of the structure. The arm and flexure structures are non-magnetic except at said region of intersection to reduce, in conjunction with the single region of intersection of said structures, cross-talk between adjacent drivers.

REFERENCES:
patent: 1234440 (1917-07-01), Bliss
patent: 3279362 (1966-10-01), Helms
patent: 3420032 (1969-01-01), Felt
patent: 3672482 (1972-06-01), Brumbaugh et al.
patent: 3726213 (1973-04-01), Hebert
patent: 3745495 (1973-07-01), Chai et al.
patent: 3842955 (1974-10-01), Iwasaki
patent: 3889793 (1975-06-01), Cattaneo
patent: 3929214 (1975-12-01), Hebert

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