Matrix print head, in particular serial matrix pin print head

Details Matrix print head, in particular serial matrix pin print head Matrix print head, in particular serial matrix pin print head

1990-12-17

1994-03-01

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

4001572, 101 9329, B41J 2275

Patent

active

052901122

ABSTRACT:
A matrix pin print head with a print pin guide casing (7) and a print pin drive casing (9) comprises an electromagnetic drive (12). The electromagnetic drive (12) comprises a magnet yoke (13) with an electromagnetic coil (14) disposed on a magnet yoke arm (13a) and with an armature (15). The armature (15) can be pivoted based on a pin bearing (16) and rests in a rearward position against a stop (18) by means of a spring (17). An operating air gap (20) is formed between the armature (15) and a magnet yoke arm front face (19). A recess (22) is disposed in the middle of the magnet yoke thickness (21) to furnish the preconditions for an assembly line production exhibiting the corresponding precision and a correspondingly bundled magnetic flux. A pin driving arm (15a) of the armature is pivotably supported in the recess (22) by way of the hinge pin (23), wherein the hinge pin axis (23a) runs laterally to the region of the magnet yoke arm center (24).

REFERENCES:
patent: 3626343 (1971-12-01), Bohlke
patent: 4167343 (1979-09-01), Golobay
patent: 4242004 (1980-12-01), Adler
patent: 4881832 (1989-11-01), Mitsuishi et al.
patent: 4993854 (1991-02-01), Sato
patent: 5000593 (1991-03-01), Gugel et al.
patent: 5011308 (1991-04-01), Shimosato et al.
patent: 5074687 (1991-12-01), Gugel et al.
"Rhomboidal Paddle Design for Printer Lever Arm", Anonymous; Research Disclosure, Jun. 1987, No. 278.
"Controls for Automated Adjustment . . . "; Anonymous; IBM Tech. Disc. Bull; vol. 31, No. 4, Sep. 1988, pp. 347-351.

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