Abstract: A cassette holder assembly includes a first cassette holder for detachably attaching a first ink ribbon cassette at a position that the ink ribbon is supplied to a printing face of a print head, and a second cassette holder detachably mounted on the first cassette holder when the first ink ribbon cassette is detached from the first cassette holder and provided with a ribbon shifting mechanism for shifting the ink ribbon of a second ink ribbon cassette with respect to the printing face of the print head. In accordance, the cassette holders can be replaced easily by an operator, and the printer can be used effectively.

Abstract: A toner cartridge has an outer cylinder and an inner cylinder contained in the outer cylinder in such a relation that it is adjacent to the outer cylinder and rotatably slidable relative thereto. Outer cylinder toner discharge openings are formed in the outer cylinder and spaced in the longitudinal direction thereof. Inner cylinder toner discharge openings are formed in the inner cylinder and spaced in the longitudinal direction thereof, the inner cylinder toner discharge openings being alignable with the outer cylinder toner discharge openings. Opposite ends of the outer cylinder are provided with notches. The outer cylinder toner discharge openings are spaced by at least one outer cylinder rib. The inner cylinder toner discharge openings are spaced by at least one inner cylinder rib which is not axially aligned with the outer cylinder rib.