Ribbon cassette for mailing machine

摘要

A thermal ink ribbon cassette for a mailing machine has an anti-reverse spring for preventing rotation of the take-up spindle in the unwinding direction; a constant-tension drag arrangement, including an expansible stub axle, a cooperating expansion member, and a drag gear mounted on the stub axle in meshing engagement with an array of gear teeth surrounding the base of the ribbon supply spindle; and a guide bar for defining an optimal ribbon path between the entrance opening of the cassette housing and the take-up spindle.