Typewriter

Details Typewriter Typewriter

1979-05-14

1981-08-11

Pieprz, William

Typewriting machines

Locking or interlocking mechanism

For interlocking plural functions or mechanisms

400 52, B41J 522, B41J 2302

Patent

active

042831504

ABSTRACT:
An electric typewriter having a prevention mechanism for preventing printing errors caused by a depression of a few keys in very rapid succession. The prevention mechanism includes a lock member for locking a clutch, which is interposed between a drive motor and a printing mechanism, in a disengaged condition. The lock member is normally held in a non-operational position for allowing the clutch to be engaged, and is moved in response to a special operation of a sensing member to an operational position for keeping the clutch in a disengaged condition. The sensing member is so disposed as to be moved in a distinct way different from the normal operation mode when a few keys have been depressed in very rapid succession.

REFERENCES:
patent: 3045799 (1962-07-01), Seymour et al.
patent: 3135371 (1964-06-01), Young
patent: 3191740 (1975-06-01), Smusz et al.
patent: 3349884 (1967-10-01), Francisco
patent: 3353646 (1967-11-01), Young
patent: 3554348 (1971-01-01), Herrmann
patent: 3568811 (1971-03-01), Johnson
patent: 3642110 (1972-02-01), Hishida et al.
patent: 3718243 (1973-02-01), Chvatlinsky
patent: 3721327 (1973-03-01), Werf et al.
patent: 3871505 (1975-03-01), Theilen

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