Matrix pin print head having a shield to counter magnetic fields

Details Matrix pin print head having a shield to counter magnetic fields Matrix pin print head having a shield to counter magnetic fields

1990-02-20

1991-12-17

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 227

Patent

active

050730517

ABSTRACT:
A matrix pin print head, particularly of the biased construction, includes a base plate (1) made of a soft-magnetic material, an annular permanent magnet (2), a distance spacer ring (3), a spring (4) tensioned in each case radially outwardly, where an armature body (6) is attached at the spring (4), which armature body (6) can be biased in each case against the core (7) of an electromagnetic coil (8) disposed in each case on the base plate (1), wherein the magnet flux generated by the permanent magnet (2) can be balanced by feeding a current through the electromagnetic coil (8), and wherein the armature body (6), at which armature body (6) there is attached a print element (4a), can be shot off against a recording material carrier, and wherein there is possibly provided a side magnet flux circuit via a short circuit body in addition to the main magnet flux circuit (9) formed via the permanent magnet (2). In order to avoid a power-reducing interaction of neighboring electromagnetic coils based on their magnet fields, each electromagnetic coil (8) is surrounded at its circumference (8a) in part or fully with soft-magnetic materials (11).

REFERENCES:
patent: 4258623 (1981-03-01), Barrus et al.
patent: 4527469 (1985-07-01), Wolf et al.
patent: 4568207 (1986-02-01), Hara et al.
patent: 4597680 (1986-07-01), Norigoe et al.
patent: 4820065 (1989-04-01), Koyama et al.
patent: 4895463 (1990-01-01), Wysk
patent: 4895464 (1990-01-01), Rubinshtein
patent: 4976554 (1990-12-01), Shimosato et al.

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