Control circuit for dot matrix printing head

Details Control circuit for dot matrix printing head Control circuit for dot matrix printing head

1988-03-21

1989-07-25

Sewell, Paul T.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

400121, 400124, B41J 938

Patent

active

048507245

ABSTRACT:
Control circuit for a dot matrix printing head of the permanent magnetic type or simple electromagnet type, wherein a printing element is subjected to a variable magnetic flux, owing to an energization current and/or to a movable armature movement, which causes an energization current to be established in the printing element for its actuation. The energization current is switched off for the deactivation of the printing element and which thereafter establishes a shorting path letting a current, induced in the printing element by mangetic flux changes due to the movable armature movement, to flow in the printing element, with a damping effect on the armature movement.

REFERENCES:
patent: 4473311 (1984-09-01), Sakaida
patent: 4637742 (1987-01-01), Sakai
patent: 4741636 (1988-05-01), Takahashi
patent: 4743821 (1988-05-01), Hall

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