Title:
NEEDLE PRINTING HEAD
Document Type and Number:
Japanese Patent JPS6353055
Kind Code:
A
Abstract:
The invention relates to a needle printing head (1) comprising a number of printing units (2). Each printing unit (2) is provided with a spring (9) supporting an armature (6) and a printing needle (1O). The armature (6) luded in a magnetic field path comprising both a permanent magnet (4) and an electromagnet (7) provided with a core (8). Each spring (9) has one rigidly fastened end and one freely swinging end. According to prior art needle printing heads, the springs are so fixed that essentially the hole bending takes place in one single point in direct connection to the rigidly fastened end. This puts high requirements upon the spring material and the risk of material fatigue is great. According to the invention the bending of the spring (9) does not take place in one signal point, but it distributed along at least a first length adjacent to the fastening point. This distributed fastening is obtained by means of a supporting means (5.1) disposed on the side of the spring facing the electromagnet between the fastening point and an end of the core of the exciting coil (8) disposed in connection to the armature (6).
Inventors:
PERU ERIKU ERIKUSON
Application Number:
JP14928387A
Publication Date:
March 07, 1988
Filing Date:
June 17, 1987
Export Citation:
Assignee:
PHILIPS NV
International Classes:
B41J2/28; B41J7/02; (IPC1-7): B41J3/10; B41J7/02
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)
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