Mannesmann Aktiengesellschaft

Clemens Kaufmann

Bernd Gugel

Herbert Kitzberger

Kurt Rohrer

A matrix pin print head of the hinged clapper armature construction includes several pin systems which, in each case, include a magnetic yoke limb pair (2), an electromagnetic coil (3), a hinged clapper armature (4), and a print pin (1). The multiple pin system further includes an electromagnetic coil support (13), which is produced by way of sintering or precision-casting, and which forms a single-piece component together with a base plate and the magnet yoke limb pairs (2). In a system with a low number of pins such as nine pins, the electromagnetic coil support (13) exhibits radially outwardly individual magnet yoke limbs (2a) and an armature guide, wherein the individual hinged clapper armatures (4) are precisely positioned and without cause for a loss of magnetic energy. In each case, the magnetic yoke limbs are directed toward a pin engagement point (8) or, respectively, to a pin attachment position (8b). The radial inner magnet yokes are formed to a closed, circular, or polygonal ring (17). Guide means (18), coordinated in each case to a course of pivot motions of the hinged clapper armatures (4), are coordinated to the hinged clapper armatures (4), where the guide means (18) cooperate with the receiving means (19) at the closed ring (17).

Matrix print head of hinged-clapper-armature construction

The print pin drive device group (3) and a print pin guide device group (5) with a casing (8) guiding the print pins (7) is provided with an adjustable print pin guide (2) at a matrix pin print head (1). An electric lifting magnet (9) with set screw (12) for the magnet core (13) is disposed in the regiion of the print pin guide device group (5). The magnet core (13) forms together with a pin guide carrier (15) an adjustable magnetic discontinuity air gap (14). Therefore, the pin guide carrier (15) is movable back and forth between two fixedly adjustable positions. In order to provide for a precisely operating print pin guide, which is also suitable for shorter, more bend-resistant print pins, behaving stiffer against bending, it is disclosed that the electric lifting magnet (9) is disposed with its coil center axis (16) perpendicular to the center axis (17) of the matrix pin print head (1) running perpendicular to the print direction of the print pins (7) and that the magnet core (13), movable in a guide, is connected with a parallel adjustable pin guide carrier (15).

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Ulm, Germany

Clemens Kaufmann