Reusable ribbon cassette

A cassette casing adapted to receive a replaceable spool of ribbon, said spool having a bore, the casing comprising two spaced sides, two spaced spool carrier shafts rotatably mountable within the casing, each spool carrier shaft being journaled in opposed pairs of holes provided in the opposed sides of the casing, one hole of each pair being smaller than the other and each spool carrier shaft having an area of reduced diameter at one end terminating axially thereof in a peripheral shoulder, said one end of each shaft being journaled in the smaller hole while the opposite end of the shaft is journaled in the larger hole, at least one of the spool carrier shafts being retractable from the casing through a larger hole in the axial direction thereof, means for locking the retractable shaft in the casing against retraction, means providing a guide path for the ribbon to travel in the casing from a spool on one spool carrier shaft to a spool on the other shaft, and a loading aperture in the casing through which said spool of ribbon may be inserted into the cassette between said two sides in a direction transverse to the axis of the spool and be positioned in the casing for insertion of said retractable spool carrier shaft through the bore of said spool of ribbon to hold the spool of ribbon within the casing for rotation.