Mannesmann Aktiengesellschaft

Mannesmann Aktiengesselschaft

Harald Niebel

Bernd Gugel

Hubert Ott

Horst Heisele

Herbert Kitzberger

Wolfgang Seybold

A dot matrix print head with a moveable print needle guide. The dot matrix print head includes an elastic adjustment element mounted in the housing of the dot matrix print head and extending at least approximately parallel to the print needles. The movement of the guide relative to the housing is adjustable.

Dot matrix print head with moveably adjustable needle guide

A matrix print head includes a magnetic yoke plate, magnetic pole defining cores annularly arranged on the yoke plate, electromagnetic coils mounted on the cores, a permanent magnet plate arranged in magnetic conductive relationship to the yoke plate; the yoke plate, the cores, coils, and permanent magnet plate establishing an electromagnetic assembly, there being additionally an armature assembly including an armature plate and a plurality of deflectable radially extending armature arms, the armature assembly being arranged in relation to the electromagnetic assembly such that the armature arms cooperate with the electromagnetic cores, there being print elements such as styli connected to the armature arms; the improvement disclosed is comprised of the following features, the armature plate and the armature arms are physically separated from each other but resiliently interconnected to establish a single uncritical parasitic air gap; and the magnetic yoke and armature plates are radially, inwardly recessed vis-a-vis the permanent magnet plate. A radially inwardly and outwardly recessed intermediate plate is interposed between the permanent magnet and the armature ring.

Magnetic circuit for matrix print head

The armature assembly for matrix print heads having a plurality of magnetic drives for a corresponding plurality of print elements is made by providing an annular armature ring and positioning a disc annulus inside the armature ring in a concentric relation thereto; a resilient arm ring is superimposed upon the disc and armature ring so as to establish concentric placement thereto; the arm ring is fastened to the armature ring and the arms of the arm ring to the disc such that the ring arms extend above an annular gap between the armature ring and the disk; subsequent slots are thermally cutting into the disk to obtain individual armature arms, the slots extending into and through said annulus to divide the annulus into individual arms that remain connected to the armature ring on account of the fastening. The disk may have been cut out from the armature ring.

Making an armature assembly for matrix print heads

A dot matrix print head which has on the side of the print countersupport (1) a print needle adjustment unit (3) with an electromagnetically drivable guide orifice (7) for the print needles (4) on an adjustment element (6). To provide a precise adjustment for the guide orifice (7) with controllable production tolerances, with flat design of the print head in the area of the guide orifice (7), and with easy installation, to provide a changeover for several guide orifices (7), and to define reliable end positions of the guide orifices (7), the adjustment element (6) consists of a guide support (7) mounted in the area of the print needle drive unit (2) and swiveling by means of a play-free joint (8). An electromagnet (15), fastened next to the guide support (7), is mounted on an armature bridge (13) supported in a play-free swivel bearing (14) running crossways to the guide support (7). The armature bridge (13) rests on the guide support (7) by spaced supporting projections (18), (19).

Dot matrix print head with an adjustable print needle guide

A print head includes a coil carrier having upwardly bent legs serving as yokes and being arranged around or upon a permanent magnet whose outer face is coplanar with the end faces of the yokes; a cover plate is mounted on and in that plane having apertures adjacent the space between the permanent magnet and the closest yoke. A set of armature plates is resiliently mounted on the other side of the cover plate respectively adjacent the apertures which are filled with nonmagnetizable material, and the magnet plate of each armature has affixed to it thin, side-wall type members converging towards a main apex-point to which the stylus is mounted.

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Senden, Germany

Harald Niebel