Wire printing head with unitary return group

Details Wire printing head with unitary return group Wire printing head with unitary return group

1989-06-26

1991-10-08

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 101 9334, B41J 224

Patent

active

050549421

ABSTRACT:
A needle or wire printing head comprises a plurality of electromagnets with fixed cores, each with two limbs, which are mounted in a ring within a containment body. Movable armatures are disposed in a radiating array in front of coplanar terminal surfaces of said cores. The movable armatures each have a step configuration for oscillating on the terminal surface of the more outward limb, a surface for closing the magnetic flux which, with the terminal surface of the more inward limb constitutes a main air gap "G" and an end capable in printing of engaging a needle by means of a corresponding limb. A unitary return group accomodates a plurality of coil springs in a prestressed state for restoring the movable armatures. There is also provided a magnetically conductive conveying disc of ferro-magnetic material and comprising a plurality of spokes for closure of the magnetic flux which is common to the armatures and the cores.

REFERENCES:
patent: 4218149 (1980-08-01), Okada
patent: 4423969 (1984-01-01), Kobryn
patent: 4832515 (1989-05-01), Kawakami
patent: 4881832 (1989-11-01), Mitsuishi et al.
patent: 4944615 (1990-07-01), Kato et al.

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