Single pass ink ribbon cassette for typewriters or similar machi

Details Single pass ink ribbon cassette for typewriters or similar machi Single pass ink ribbon cassette for typewriters or similar machi

1986-10-07

1987-08-25

Sewell, Paul T.

Typewriting machines

Including interposed inking device for record-medium

Package for ribbon facilitating mounting of ribbon on...

4002271, B41J 3200, B41J 3314

Patent

active

046889540

ABSTRACT:
A single pass ink ribbon cassette for typewriters or like machines is designed to track ribbon extending between a supply and take-up spool in such a manner that text contained on used ribbon beyond a point of impression is rendered illegible. Used ribbon is rendered illegible in that upon its entry into the cassette, it is guided around a turn around roller for passage past the point of impression a second time before re-entry again into the cassette, and conducted via guide means for take-up by a driven take-up spool. Due to the fact that the ink ribbon is guided past the point of impression a second time, subsequent impressions on the used ribbon render the text from the used ribbon unreadable. In addition, in the zone of the turn around roller a scraper is provided for scraping the residual ink particles off the used ribbon before it is guided past the point of impression the second time.

REFERENCES:
patent: 1548217 (1925-08-01), Sherrod
patent: 2102693 (1937-12-01), Garbell
patent: 2103734 (1937-12-01), Schmidt
patent: 4051944 (1977-10-01), Starr
patent: 4341479 (1982-07-01), Sanada
patent: 4511902 (1985-04-01), Nagashima

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