Actuation magnet for a printing stylus of a matrix printer

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact

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4001572, B41J 227

Patent

active

050712675

ABSTRACT:
The invention relates to an actuation magnet for a printing stylus (11) of a matrix printer, in which an armature (12) of the plunger type connected to the printing stylus (11) is guided in the cylindrical inner space of two soft-magnetic pole pieces (6,7) enclosed by a direct current energizing coil (14), the space between these pole sleeves (6,7) being bridged by a spacer element (17), which consists of a material, whose magnetic conductance or permeance is considerably smaller than that of the material of the pole sleeves (6,7). The movement force exerted on the soft-magnetic armature (12) is increased in that the distance between the ends of a yoke (13) is bridged by a permanent magnet (17), whose pole faces engage the free ends of the yoke (13), and in that the energization of the energizing coil (14) produces a magnetic flux, which has a sense opposite to a magnetic flux of the permanent magnet (17) through the yoke (13).

REFERENCES:
patent: 3755700 (1973-08-01), Buschmann
patent: 4044878 (1977-08-01), Kunath
patent: 4226545 (1980-10-01), Brandenburg
patent: 4259653 (1981-03-01), McGonigal
patent: 4479103 (1984-10-01), Bailey

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