Advance and transfer mechanism for inked ribbon or the like

Details Advance and transfer mechanism for inked ribbon or the like Advance and transfer mechanism for inked ribbon or the like

1978-08-28

1980-07-29

Coven, Edward M.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-reversing mechanism

4002361, B41J 3348

Patent

active

042148383

ABSTRACT:
Two arms carry two pawls each. One pawl of each arm engages one ratchet wheel and, alternately, the other pawl of each arm engages another ratchet wheel when the arms are moved at the end of the travel of a ribbon. The ratchet wheels carry ribbon spools. One arm carries push pawls. The other carries pull pawls. The push pawls act as no-backs, but they also drive the ratchet wheels. Each ratchet wheel is thus positively driven more or less continuously when it is driven. The ratchet wheels are driven alternately. An over-center transfer mechanism places a desired pair of pawls in position for ratchet wheel engagement and the other pair for disengagement at each end of the ribbon travel.

REFERENCES:
patent: 1543286 (1925-06-01), Grandjean
patent: 2505991 (1950-05-01), Reinhold
patent: 2906203 (1959-09-01), Grosse
patent: 2986260 (1961-05-01), Whippo
patent: 3771442 (1973-11-01), Ditman
patent: 3819028 (1974-06-01), Drillick
patent: 3976185 (1976-08-01), Aebi

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