Armature of printing head for use in wire printer.

摘要

An armature device of a printing head for use in a wire printer includes a stylus (2) having a free end to hit a recording medium for printing, an armature (1) connected to the stylus (2) for reciprocating the stylus (2) in a longitudinal direction (A, B) thereof, a permanent magnet (4) for generating a magnetic flux, a core (3) for conducting the magnetic flux into the armature (1) to form a magnetic path, a coil winding (5) wound around the core (3) for substantially canceling, when powered, the magnetic flux, and a spring member (6) having a free (62) end supporting the armature (1) for biasing the armature (1) by a spring force in a direction to separate the armature (1) from the core (3). The armature (1) has generally an elongated shape, in an end portion (80) of which a groove (11) is formed to extend in a direction substantially perpendicular to the longitudinal direction of the armature (1). The end portion (80) of the armature (1) has a first portion (19/80) forming one wall of the groove (11) in the longitudinal direction of the armature (1) and a second portion (80/19) forming the other wall of the groove (11) in the longitudinal direction. The one wall (a/b) is higher than the other wall (b/a). The stylus (2) has an end portion (21) opposing to the free end thereof and housed in the groove (11), with an end surface facing a bottom of the groove (11), to be bonded on the groove (11).