Patent ID: 6513997
Filing Date: 2003-02-04
Classification: B41J

Abstract:
A wire dot printer head, comprising:a yoke; a plurality of cores arranged in an annular form on the yoke; a plurality of coils combined with the cores so as to fit the cores; a plurality of armatures supported so as to be raised or lowered in respect to the cores; a plurality of wires supported at the free ends of the armatures in such a way that they may be driven and displaced; and an extremity end guide having a plurality of guide holes for independently and slidably supporting the extremity ends of the wires to arrange them; wherein the guide holes of the extremity end guide form one or more groups, the extremity end guide holes in each of the groups are set such that a plurality of wires having rear ends adjacent to each other within a certain range serves as one sub-group, the wires are classified into a plurality of sub-groups, the extremity ends of the wires are arranged on a straight line in the sub-scanning direction, and the arrangement positions of the extremity ends of the wires in the main scanning direction are made different in response to a difference in the arrangement positions of the rear ends of the wires for every sub-groups different in such a way that the bending stress of the corresponding wire may become low as compared with that where the extremity ends of all the wires are arranged on the straight line.