Construction of wire type dot printer head

Details Construction of wire type dot printer head Construction of wire type dot printer head

1979-05-11

1981-02-24

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

042524490

ABSTRACT:
In a wire type dot printer head a flat lever pivots on a fulcrum when attracted by an electro-magnetic coil. Pivoting of the lever on the fulcrum drives a print wire or needle, in opposition to a biasing spring, against an ink ribbon and paper for printing on the paper with dots. The biasing spring returns the needle to a stand-by condition after printing. A cantilever spring acts on the lever, being attached near the fulcrum. A spacer sheet, impregnated with a lubricant, is disposed between the lever and the electro-magnetic coil so that lubricant is supplied to the fulcrum of the lever and in the region where the lever engages the print needle or wire. The life of the print head is extended by the availability of lubricant, and the lubricant does not interfere with the printing action. The printer head includes a plurality of similar independently operating needles and drive mechanisms.

REFERENCES:
patent: 3828908 (1974-08-01), Schneider
patent: 3982622 (1976-09-01), Bellino et al.
patent: 4165940 (1979-08-01), Cacciola
"Properties and Performance of Nomex Type 411 Paper", DuPont Bulletin N-254, Sep. 1971.

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