Print hammer assembly for dot line printer
AssigneeHitachi Koki Co., Ltd.
InventorsShigenori Suematsu, Yoshikane Matsumoto, Hirotaka Kobayashi, Kenichi Kugai, Shinichi Sakamoto
Life of this patent
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Abstract
In a print hammer assembly for a dot line printer, print pins are attached to the tip ends of print hammers alternately displaced toward left and right by a predetermined distance from a vertical center of the print hammer, wherein comb portions of a front yoke at both sides of the plunger are made to be an equal width. With such an arrangement, the print pins are not deformed horizontally due to imbalanced magnetic force applied to the associated print hammer at the time of magnetization of a permanent magnet.
Claims6
A print hammer assembly for a dot line printer, comprising:
- a leaf spring having a plurality of print hammers formed thereon, each print hammer having a tip end which is movable between a first position and a second position;
- a plunger provided respectively on each of said plurality of print hammers;
- a plurality of print pins provided respectively on the tip ends of said plurality of print hammers for making dot impressions on a print paper, said plurality of print pins being arranged on a print line in a predetermined unequal interval relation;
- magnetic means for magnetically attracting said plurality of print hammers into said first position;
- an electromagnetic coil provided in association with each of said plurality of print hammers for releasing said print hammers from said first position and allowing said print hammers to move toward said second position when a corresponding one or said electromagnetic coils is energized;
- and
- a front yoke disposed in facial contact with said leaf spring;
- said plurality of plungers being arranged so that centers of adjacent plungers are at equal distances from each other along a line parallel to the print line, said plurality of plungers having equal widths in the direction of said line.
Dependencies are inferred from the claim text.