U.S. Philips Corporation

Hermann Richter

Wendelin Weber

Heinrich Durr

Klaus Brandenburg

Lothar Haubrich

Peter Engler

Burkhard Goerke

A matrix printer comprising a printing head which is pivotable, under the influence of the braking effect of a magnetic field, about an axis which is perpendicular to the line direction and to the surface of the paper to be printed. The different printing positions of the printing head realized by said pivoting motion are utilized for printing characters with a comparatively good recognizability at a comparatively low printing speed or, as desired, for printing characters which are less rapidly recognizable at a comparatively high printing speed. Matrix printers of this kind are used, for example, in text editing systems.

Matrix printer with magnetic head adjustment

A stylus printing head comprising a number of electromagnets which operate the printing styli and which are clamped on a conical carrier by means of a clamping device. The carrier comprises cradle-shaped, resilient supports for each of the electromagnets. The resilient supports compensate for differences in expansion of the electromagnets, the carrier and the clamping device in reaction to temperature variations occurring. The resilience of the supports is obtained by means of slots in the carrier which enable the use of a plurality of carriers in the same printing head.

Stylus printing head comprising electromagnets on resilient supports

An electromagnetic drive for a recording pin of a matrix printer, comprising a cylindrical armature which is displaceable by means of an excitation coil and in which a clamping sleeve is provided which comprises an indentation which encloses the recording pin in a clamping manner and whose length governs the position of the recording pin.

Electromagnetic drive for recording pins in a matrix printer

A method of manufacturing an electro-magnet, comprising two tubular poleshoes which are coaxially arranged with respect to each other and in which an armature is slidable, the inner surface of the poleshoes and the outer surface of the armature being successively degreased and pickled, after which they are provided with a nickel layer by electroplating, and a nickel phosphide layer formed by electroless deposition of a nickel-phosphorus layer which is converted to nickel-phosphide by heating to about 400.degree. C. The electromagnets manufactured by means of the method in accordance with the invention are particularly suitable for us in matrix printers.

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Siegen, Germany

Hermann Richter