Ribbon cassettes

Details Ribbon cassettes Ribbon cassettes

1986-01-14

1988-08-30

Pieprz, William

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400235, 242 673R, B41J 3324

Patent

active

047672285

ABSTRACT:
A ribbon cassette, such as in inked ribbon for a printing machine, has a supply spool and a take-up spool. An unwinding force is applied to the ribbon and the take-up spool is driven from the supply spool through a slip coupling. The configuration of the driving connection between the spools is such as to lead to a theoretical speed of the take-up spool which is always greater than is actually needed to match the speed of unwinding from the supply spool. Slip however occurs to match the speeds and to maintain tension in the ribbon.

REFERENCES:
patent: 3090299 (1963-05-01), Comstock, III
patent: 3759433 (1973-09-01), Gerber
patent: 3762530 (1973-10-01), Patel
patent: 3967790 (1976-07-01), Hess
patent: 4151039 (1979-04-01), Lash
patent: 4467976 (1984-08-01), Bogaczyk et al.
patent: 4544291 (1985-10-01), Nagata et al.
patent: 4577199 (1986-03-01), Saiki et al.
patent: 4591879 (1986-05-01), Yokota et al.

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