Abstract: A printer in which a daisy wheel on a carriage is caused, by a hammer actuating mechanism, to impact against a printing sheet fed by a sheet feed mechanism, so that the sheet is printed with use of a ribbon interposed between the sheet and the wheel. The hammer actuating mechanism, a printing ribbon feed mechanism, a correction ribbon feed mechanism, and a correction ribbon lift mechanism constituting a first driven section, and the sheet feed mechanism constituting a second driven section, are connected to a single DC motor by means of clutch means. In driving the first driven section, the motor is supplied with a predetermined supply voltage from an external power source. In driving the second driven section, the motor is supplied with a supply voltage chopped by chopping means so that the second driven section is driven with a smaller driving force and at a lower rotating speed than the first driven section is.

Abstract: 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.