Device for printing out indices and powers in typewriters

Details Device for printing out indices and powers in typewriters Device for printing out indices and powers in typewriters

1977-10-12

1980-01-01

Wright, Jr., Ernest T.

Typewriting machines

For line-spacing by incremental rotation of platen

By electric-power drive

400904, 400 65, 400551, 400555, B41J 1976

Patent

active

041814444

ABSTRACT:
A device is disclosed for index and exponent impression printing in typewriters. An exponent or index switching key has associated with it an edge detector, and parallel thereto, a state detector. A time function element which triggers a gate circuit for the triggering of the drive motor for the roller is connected behind the edge detector. A rotational direction reversal switching device is connected behind the state detector. The device is useful in office typewriters, data printers or telex machines not equipped with their own exponent or index printing symbols.

REFERENCES:
patent: 3534847 (1970-10-01), Willcox
patent: 3858704 (1975-01-01), Kawano et al.
patent: 3872959 (1975-03-01), Wang et al.
patent: 3927752 (1975-12-01), Jones et al.
patent: 3947853 (1976-03-01), Denny et al.
patent: 4037705 (1977-07-01), Martin et al.

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