Dot printer head

Details Dot printer head Dot printer head

1991-05-30

1992-03-17

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 225

Patent

active

050963139

ABSTRACT:
A dot printer head including a housing that contains electromagnets toward its back end, the electromagnets having cores positioned opposite to armatures which are supported detachably against the core. The housing slidingly supports needles connected to the armatures and pushed in retracting direction thereof. An armature stopper made of an elastic substance is fixedly attahced to the inside of a cover which closes the opening at the back end of the housing, the armature stopper being in contact with the vicinities of the free ends of the armatures. A spacer is made of a substance with a linear expansion coefficient such as to ensure the same expansion as that of the armature stopper in thickness, the spacer connecting the inside of the cover to the opening edge of the housing. In this setup, when the armature stopper extends in thickness in keeping with the temperature rise inside the housing during printing, the spacer expands by exactly the same thickness to retract the cover. This allows the armatures to return always to the same position.

REFERENCES:
patent: 4447166 (1984-05-01), Ochiai et al.
patent: 4555192 (1985-11-01), Ochiai
patent: 4624589 (1986-11-01), Ochiai et al.
patent: 4941761 (1990-07-01), Ogawa et al.
patent: 4976554 (1990-12-01), Shimosato et al.
patent: 5009528 (1991-04-01), Horii et al.

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