Ribbon cassettes

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B - Operations, Transporting

41

J

197/106, 242/61.

B41J 32/00 (2006.01) B41J 35/28 (2006.01) G07B 17/00 (2006.01)

Patent

CA 1288717

Title: Improvements in ribbon cassettes and apparatus incorporating same. 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.

499786

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