Inked ribbon cartridge ribbon with supply spool drag device

Details Inked ribbon cartridge ribbon with supply spool drag device Inked ribbon cartridge ribbon with supply spool drag device

1982-02-22

1983-10-11

Burr, Edgar S.

Typewriting machines

Including interposed inking device for record-medium

Package for ribbon facilitating mounting of ribbon on...

400234, 242 754, B41J 3528

Patent

active

044089139

ABSTRACT:
An ink ribbon cartridge is provided with means to control ribbon tension which takes the form of an O-ring driven by the supply spool which is trained around a drag post. When ribbon is to be drawn from the supply spool as by ribbon feed mechanism operative incident to a print action, the rotation of the supply spool is resisted by the drag or friction between the O-ring and the post. The drag force to be overcome to rotate the supply spool is low and does not vary significantly from full to empty supply spool. The resilience of the O-ring also stores energy which acts oppositely on the supply spool when the force to draw off ribbon is removed.

REFERENCES:
patent: 734660 (1903-07-01), Bellamy
patent: 766804 (1904-08-01), Bellamy
patent: 876454 (1908-01-01), Heuser
patent: 3877561 (1975-04-01), Guerrini et al.
patent: 4034935 (1977-07-01), Plaza et al.

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