Wire matrix print head

Details Wire matrix print head Wire matrix print head

1984-04-23

1986-06-10

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

045940100

ABSTRACT:
A wire matrix print head is disclosed including a plurality of print wires movable through supporting guides between print and non-print positions, springs urging the print wires toward their non-print positions with separate rigid armatures being movable by respective electromagnetic units from a rest position toward a print position for engaging a respective print wire and driving it toward and into its print position. A housing for supporting and accurately positioning the print wires, armatures and electromagnetic units relative to each other includes multiple portions which are interconnected in spaced apart relation about their peripheries in order to establish and maintain accurate positioning of the armatures relative to the respective electromagnetic units and print wires. While one housing portion supports and positions the electromagnetic units, another housing portion provides a pivot precisely spaced apart from an edge of each electromagnetic unit for capturing and permitting pivotable movement of the armatures therebetween. Each armature is engaged by a resilient bushing adjacent its pivot point, the bushing being slightly compressed in order to permit dampened pivoting movement maintain accurate positioning of the respective armature. A reaction element is secured to the housing for establishing a reaction surface for the armatures in order to limit return of the armatures to their rest or non-print positions.

REFERENCES:
patent: 4230038 (1980-10-01), Hebert
patent: 4230412 (1980-10-01), Hebert
patent: 4240756 (1980-12-01), Ku et al.
patent: 4260270 (1981-04-01), Cavallari
patent: 4382701 (1983-05-01), Davenport
patent: 4423969 (1984-01-01), Kobryn
patent: 4447166 (1984-05-01), Ochiai et al.

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