Abstract: What is proposed is a bistable electromagnetic valve (1) with a valve chamber (7) arranged between two pole pieces (5, 6) and with a valve body (8) which is located therein and is displaceable between two end positions and which is designed as a magnet for at least one permanent magnet (12, 13) and for at least one control coil (3), said valve being capable of being implemented in a small form of construction. This is achieved, according to the invention, in that at least one fluid duct (15) is provided as an inflow in the axial direction between the outer wall of the pole piece (5) and the valve housing (2).

Abstract: A bistable electromagnetic valve is proposed, which is to be used in refrigerant circuits. The valve can be produced at particularly low outlay and at the same time is reliably leaktight. This is achieved, according to the invention, in that the valve chamber (7) is formed within a control coil (3) by a cylindrical tubular body (2) which extends at least beyond the pole pieces (5, 6) inserted into the cylindrical tubular body (2).

Abstract: 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 v

Abstract: 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.

Abstract: A guide member for print needles and a base plate with guide apertures traversed by the rear end of the needles are bolted to a magnetic core element, having annularly arranged poles; a cover is also bolted thereto, sandwiching a case in between. The cover centers an annular element having radial spring arms which hold one end each of a plurality of armatures respectively against the annularly arranged poles. The spring arm ends and the armature ends have interlinked, raised edges for obtaining a hinged link. The other ends of the armatures engage the rear ends of the needles. The annular element carries the respective electromagnetic coils and cores.

Abstract: The needles in a printing head are guided in curved contour through plural, spaced apart guide plates having double cone bores arranged and configured to follow and determine the needle curving contour. The needles are contained in the usual conical housing whose wide rear end carries the needle drivers.

Abstract: A matrix printer with a reciprocating carriage carries transversely moving spring biased printing head. A roller on the head runs on a resilient rail urged against the platen and can be retracted by pivoting the rail carrier under engagement of a second rail cooperating with a second roller on the head. A cam track in a terminal position of the carriage provides for independent head retraction through engagement with the second roller.