Abstract: A ribbon cartridge is adapted for insertion into a printing machine such as a printing electronic calculator having a printer, a platen, and a ribbon quantity sensing and reversing lever. The cartridge comprises a cassette with an inked ribbon therein connected between two ribbon storage members. The cassette has ribbon guide members for directing the ribbon from one ribbon storage member in between the printer and platen to another ribbon storage member. The ribbon cartridge is improved by incorporating as a part of the cassette a member or members for moving the lever into a non-interfering position during the insertion of the cartridge into the printing machine, the member(s) being positioned below the operating plane of the lever upon complete insertion of the cartridge.