Line spacing device for an office machine

Details Line spacing device for an office machine Line spacing device for an office machine

1982-12-07

1986-04-15

Burr, Edgar S.

Typewriting machines

For line-spacing by incremental rotation of platen

By pawl and ratchet wheel drive

400568, 4005751, 4005752, B41J 1992, B41J 1984

Patent

active

045824401

ABSTRACT:
An automatic line spacing device which can be advantageously incorporated in typewriters, especially of the type which has no constantly rotating power shaft. A feed pawl is mounted on a rockable member and cooperates with a ratchet to angularly rotate a typewriter type platen. The rockable member is constantly coupled to a bidirectional electric motor which is first energized sufficiently to angularly rotate the rockable member from its home position to a rotated limit position defined by a fixed positive stop element for effecting a line spacing operation and then secondly energized sufficiently to rotate the rockable member back to its home position as defined by another stop element. A cam adjusts the angle during which the feed pawl engages the ratchet so as to effect different line spacing increments.

REFERENCES:
patent: 3197012 (1965-07-01), Lambert
patent: 3272303 (1966-09-01), Pohl
patent: 3763987 (1973-10-01), Kunst et al.
patent: 4365904 (1982-12-01), Mueller et al.
patent: 4376585 (1983-03-01), Fromme et al.
patent: 4383778 (1983-05-01), Costa

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