Serial impact calculator printer

Details Serial impact calculator printer Serial impact calculator printer

1978-03-24

1980-08-19

Pieprz, William

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-return mechanism

400320, 400328, B41J 1970, B41J 1956, B41J 1994

Patent

active

042181518

ABSTRACT:
A serial impact printer of the type utilizing a dot matrix print head is specifically adaptable for use as a calculator or adding machine and is characterized by utilizing a common drive source to advance the print head across the paper, advance the paper between printing operations, and selectively advance the print ribbon between the ribbon supply spool and takeup spool. An improved paper-advancing means has been devised which operates in close correlation with the print head drive member to provide a relatively high speed, simplified and inexpensive printer unit; and the ribbon supply spools are so constructed and arranged as to be interchangeable and to permit direct drive through a spool-engaging member on the print head whereby to advance the ribbon in direct response to print head travel.

REFERENCES:
patent: 3628645 (1971-12-01), McFeaters et al.
patent: 3685629 (1972-08-01), Rott
patent: 3800933 (1974-04-01), Taylor
patent: 3892304 (1975-07-01), Shakib
patent: 3929215 (1975-12-01), Hayakawa
patent: 3967714 (1976-07-01), Potma et al.
patent: 4030588 (1977-06-01), Hanagata et al.

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