Dot matrix print head

Details Dot matrix print head Dot matrix print head

1982-10-27

1985-07-30

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

045318484

ABSTRACT:
A dot matrix print head includes a solenoid and a spring assembly for driving a print pin, with a positioning means for holding the assemblies in a predetermined relation. The solenoid assembly preferably has a first positioning means adjacent its upper surface and a second positioning means preferably forms a part of the spring assembly. The first and second positioning means are preferably circumferential and the second means is preferably adapted to engage the first positioning means around more than 180.degree. of arc thereof and is expandable to permit sliding engagement with the first positioning means so as to hold the spring assembly locked onto the solenoid assembly. Preferably a molded stiffening rib is carried by the spring assembly and extends from the armature to the pin-carrying tip of the spring assembly. The molded pin support is formed integrally with the stiffening rib and permits rotation of the end of the pin in the support. It is also preferred that there be a molded pad carried by the stiffening rib to engage an impact absorbing member during return of the printing pin from printing position.

REFERENCES:
patent: 4206266 (1980-06-01), Bellinger
patent: 4236836 (1980-12-01), Hodne
patent: 4389127 (1983-06-01), Bellinger
patent: 4403875 (1983-09-01), Asano et al.

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