Printer head for serial dot printer

Details Printer head for serial dot printer Printer head for serial dot printer

1981-03-16

1983-03-22

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 335217, B41J 312

Patent

active

043773486

ABSTRACT:
A serial printer head is provided which comprises a sandwich structure (1,3,5) of a first circular yoke plate (1), a cylindrical magnet (3) and a ring shaped second yoke plate (5); a plurality of electromagnets (2,4) positioned on the first yoke plate (1) at predetermined angle intervals; an armature-print-needle assembly (7,8,9,10) having a circular resilient spring (7), a plurality of armatures (8) and a plurality of print needles (9) placed on the sandwich structure (1,3,5) so that the sandwich structure (1,3,5), electromagnets (2,4) and the armatures (8) provide first a substantially closed magnetic path; and an adjusting yoke (12) attached to the sandwich structure (1,3,5). The adjusting yoke (12) has the magnetic characteristics that the magnetic reluctance increases as the temperature increases. Although the flux generated by the permanent magnet (3) is changed due to the change of the temperature, that flux change is compensated for by the presence of the adjusting yoke (12).

REFERENCES:
patent: 2975339 (1961-03-01), Mitchel et al.
patent: 3325757 (1967-06-01), Gang
patent: 3556150 (1971-01-01), King
patent: 3659238 (1972-04-01), Griffing
patent: 3831051 (1974-08-01), Ohgoshi et al.
patent: 4009772 (1977-03-01), Glaser et al.
patent: 4044668 (1977-08-01), Barrus et al.
patent: 4225250 (1980-09-01), Wagner et al.

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