Release-type dot print head and method of manufacturing the same

Details Release-type dot print head and method of manufacturing the same Release-type dot print head and method of manufacturing the same

1988-10-14

1990-12-11

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

296021, B41J 2275, B41J 224

Patent

active

049765540

ABSTRACT:
A release-type dot print head formed by joining together a magnet unit, and an armature unit formed by brazing torsion bars to armatures and supporting parts formed integrally with a second yoke with the armatures in a state in which the free ends of styluses fixed to the free ends of the armatures project from the outer surface of a stylus guide attached to the second yoke by a predetermined length. Portions of the free ends of the styluses projecting from the outer surface of the stylus guide are cut off by a wire-cut electrical discharge cutting process with the styluses in a free state to adjust the length of projection of the free ends of the stylus to a predetermined length. The second yoke and the stylus guide are formed respectively of materials having substantially the same coefficients of thermal expansion. The armature unit is subjected to heat treatment after assembly.

REFERENCES:
patent: 2129065 (1938-09-01), Loop
patent: 4167343 (1979-09-01), Golobay
patent: 4278020 (1981-07-01), Oaten
patent: 4437775 (1984-03-01), Ochiai et al.
patent: 4472071 (1984-09-01), Blomquist et al.
patent: 4537520 (1985-08-01), Ochiai et al.
patent: 4571101 (1986-02-01), Sakaida
patent: 4611393 (1986-09-01), Norigoe
patent: 4618277 (1986-10-01), Asano
patent: 4634301 (1987-01-01), Sakaida
patent: 4652158 (1987-03-01), Asano
patent: 4674179 (1987-06-01), Gugel
patent: 4767226 (1988-08-01), Sakaida et al.

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