Tensioning means for printing ribbon cassette

摘要

A printing ribbon cassette having in a casing a supply spool carrying a printing ribbon thereon and a take-up spool on which the ribbon is wound as it is released from the supply spool having an axis of rotation which is movable as the ribbon is released therefrom. A ribbon tensioner in the casing has a base rotatably supported on a supply spool shaft, and one end engaged with the ribbon released from the supply spool, while the other end of the tensioner is engaged with a guide member in the casing. The outer end of the tensioner is movable along the guide member with the displacement of the supply spool shaft to enable one end of the tensioner to maintain a constant range of tension on the ribbon.