Dot matrix print head

Details Dot matrix print head Dot matrix print head

1979-05-14

1981-11-17

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

043008453

ABSTRACT:
A dot matrix-type print head for forming a character-defining array of individual dots on a print-receiving surface includes a plurality of parallel-spaced print wires arranged in a vertical plane perpendicular to the print receiving surface. The print wires are individually actuated by respective actuator assemblies which each include a stationary portion consisting of an end plate, a bobbin, a solenoid winding, and a spring, and a movable portion consisting of a magnetic armature attached to the associated print wire. Upon energization of the solenoid winding the resulting magnetic flux displaces the magnetic armature and causes the print wire to impact the print-receiving surface. A frame comprising two parallel-spaced side plates maintains the stationary print head components in alignment, and progressive vertical displacement of the actuator assemblies within the plane of the print wires to align with respective print wires enables the actuator assemblies to be formed from identical components for manufacturing economy.

REFERENCES:
patent: 3787791 (1974-01-01), Borger et al.
patent: 3820643 (1974-06-01), Priebs et al.
patent: 3834506 (1974-09-01), Priebs
patent: 3929214 (1975-12-01), Hebert
patent: 3963108 (1976-06-01), Steinhausser
patent: 4044878 (1977-08-01), Kunath

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