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US 5,312,195 AGranted
Electromagnetic drive mechanism for the printing pin of a print head
AssigneeSiemens Nixdorf Informationssysteme Aktiengesellschaft
InventorsDieter Grandke, Heinrich Hoffmann, Detlef Prahl, Ralf Reinkemeier, Rolf Roeschlein
Life of this patent
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Abstract
An electromagnetic driving device for driving a print needle of a printer employing an E-shaped magnetic yoke. In order to improve print speed, the armature and arms of the yoke are specifically dimensioned. The precise lengths and widths of the armature and yoke provide an inductive circuit that minimizes both magnetic losses and inductance.
Claims9
An electromagnetic drive mechanism for a printing pin in a dot matrix printhead, comprising:
- an E-shaped magnetic frame having a pair of outer limbs, and a center limb carrying an electric field coil;
- and,
- an elongate cutout blade opposing said limbs and having a width greater over its entire length than that of said limbs, said blade having one end thereof pivotally mounted on one end of said magnetic frame, the other end of said blade extending over said magnetic frame and acting on said pin,
- the average length of a magnetic flux path formed by the center limb and one of the outer limbs being less than 30 mm, and the inductance of the resulting magnetic circuit being less than 3 mH,
- said blade having a magnetically effective cross-section 10 to 50% less than the magnetically effective cross-section of said outer limbs.
2 more elements
Dependencies are inferred from the claim text.