Core structure for electromagnetic print head

Details Core structure for electromagnetic print head Core structure for electromagnetic print head

1986-08-07

1988-06-07

Wiecking, David

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

047492902

ABSTRACT:
In a print head comprising a plurality of magnetic circuits each of which comprises an armature supported by a spring, a permanent magnet for biasing the armature in one direction, and an electromagnet which can be energized so as to cancel the biasing force of the permanent magnet, so that a print wire fixed to the armature may be driven by energizing the electromagnet and thereby driving the armature with the restoring force of the spring. The cross-sectional areas of the paths of magnetic flux between neighboring electromagnet circuits are made uneven. This can be achieved by providing base portions which are common to two electromagnet core portions. Thereby, the print pressure of all the print wires is made uniform and an increase in printing speed and improved print quality can be achieved at the same time.

REFERENCES:
patent: 4541745 (1985-09-01), Gugel
patent: 4600323 (1986-07-01), Harada et al.
patent: 4602881 (1986-07-01), Prevignano et al.
patent: 4618276 (1986-10-01), Blomquist et al.

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