Needle print head

Details Needle print head Needle print head

1988-02-17

1989-06-13

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400174, 101 9304, B41J 310

Patent

active

048387142

ABSTRACT:
In a needle print head including a plurality of hinged armature magnets arranged in a ring about a needle guide with each of the magnets including a U-shaped magnet yoke, a magnet coil on one of the U-legs of such yoke and a hinged armature arranged at least nearly radially, the hinged armature at its radially inner end is connected to a print needle and is biased by spring force to a rest position away from the yoke at which it engages a stop, each hinged armature at its radially outer end being pivotally supported by a cylindrical pin for rotation about the axis of the pin, and a return spring engaging the hinged armature at a point between the print needle and the radially inner yoke leg.

REFERENCES:
patent: 3842955 (1974-10-01), Iwasaki
patent: 4167343 (1979-09-01), Golobay
patent: 4175076 (1979-11-01), Hanaoka
patent: 4320981 (1982-03-01), Harrison et al.
patent: 4396304 (1983-08-01), Davenport et al.
patent: 4634305 (1987-01-01), West et al.
patent: 4652158 (1987-03-01), Asani et al.
patent: 4653943 (1987-03-01), Sakaido et al.
patent: 4737042 (1988-04-01), Hayashi et al.

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