Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1978-01-31
1979-10-02
Sewell, Paul T.
Typewriting machines
Typing by other than type-face or type-die
Thermal
346 76PH, 400 55, B41J 320
Patent
active
041696824
ABSTRACT:
Described is a printer mechanism which includes a platen rotatably mounted above a base, a medium upon which printing is to be accomplished and a printer unit disposed in printing relationship to the medium and the platen. A holder holds the printer unit and includes a ball and socket assembly for permitting the holder and printer to pivot about first and second orthogonal axes with respect to the platen. The holder also includes a projection which projects into a channel for inhibiting the holder and the printer unit from pivoting about a third axis, the third axis being orthoganol to both a first and second axes. The channel and an end of the ball and socket assembly are attached to the base. The printer unit is preferably of a non-inpact type such as a thermal printer unit which is mounted on a ceramic substrate for instance. The holder is urged toward the platen by means of a spring, which is attached to the holder and to the base. This mechanism enables a relatively wide printhead to follow small irregularities in the printing medium and in the platen and substantially even pressure is thereby applied across the printhead to provide uniform printed characters.
REFERENCES:
patent: 3115382 (1963-12-01), Morse
patent: 3824602 (1974-07-01), Gulati
patent: 4000393 (1976-12-01), Cochran et al.
patent: 4066369 (1978-01-01), Furtah
patent: 4090059 (1978-05-01), Kilby et al.
Comfort James T.
Sadacca Stephen S.
Sewell Paul T.
Sharp Melvin
Texas Instruments Incorporated
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