Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1980-09-05
1982-09-14
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9305, B41J 312
Patent
active
043492835
ABSTRACT:
Each hammer includes a frame-like portion with a recess into which an electrically energizable flat coil is received. Affixed to opposite sides of the frame portion, and extending therefrom over the recess in contact with the sides of the coil, are thermally conductive metallic foil sheets which serve to dissipate heat from the coil, retain the coil intact and maintain the proper position of the coil relative to the frame. The exterior surfaces of the sheets form bearing surfaces to protect the hammer and coil from wear caused by contact with other parts of the head as the hammer is displaced. An elongated recess is formed along the axis of a portion of the frame, in the direction of displacement, by cutting transverse slots therein so as to form a plurality of clamping elements, alternate ones of which are situated on opposite sides of the axis. A print wire is received within the recess and frictionally engaged by the elements so as to form a strong rigid joint without significantly increasing the mass or thickness of the hammer. The print wire is affixed to the frame portion at the center of percussion thereof to eliminate torsional vibrations, otherwise created on impact.
REFERENCES:
patent: 3101291 (1963-08-01), Lalick
patent: 3225269 (1965-12-01), Worcester
patent: 3971311 (1976-07-01), Deproux
patent: 4022311 (1977-05-01), Krull
patent: 4033255 (1977-07-01), Kleist et al.
patent: 4044668 (1977-08-01), Barrus et al.
patent: 4129390 (1978-12-01), Bigelow et al.
Meloni Robert A.
Sapitowicz Thomas P.
General Instrument Corporation
Sewell Paul T.
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