Dot matrix print head

Details Dot matrix print head Dot matrix print head

1977-06-13

1979-02-20

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

041404068

ABSTRACT:
A printing head for forming dot matrix characters which includes a wire stylus assembly having a plurality of guide bearings spaced to reduce the wear of the tip bearing, and to minimize buckling and resonances. Each stylus is driven by an electromagnetic actuator having a hinged armature, with the stylus drive point at the center of percussion of the armature with respect to the hinge line. Damping is effected at the same point. The armatures are shaped to drive the styli directly in line with the stylus wires without introducing a moment. Individual adjustments for magnetic gap are provided. A retainer device for holding all of the armatures in place during assembly is also provided.

REFERENCES:
patent: 3882986 (1975-05-01), Howard
patent: 3897865 (1975-08-01), Darwin et al.
patent: 3900094 (1975-08-01), Larsen et al.
patent: 3929214 (1975-12-01), Hebert
patent: 3991869 (1976-11-01), Berrey
patent: 4009772 (1977-03-01), Glaser et al.
patent: 4044668 (1977-08-01), Barrus et al.
patent: 4049108 (1977-09-01), Giessner

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