Typewriter ribbon feed mechanism

In a feed mechanism for advancing an ink ribbon, supported in a cartridge, in feeding steps whose length is determined dependent upon the type of the ribbon;

• the cartridge being insertable in, and removable from a typing machine;
• the feed machanism including a feed roller mounted in the cartridge and operatively connected with the ribbon for advancing the ribbon;
• the feed mechanism further including a driving device mounted in the machine and operatively connectable to the feed roller upon insertion of the cartridge in the machine;
• the improvement wherein said driving device has at least two output components arranged to rotate with unlike speeds;
• said feed mechanism further having coupling means mounted in said cartridge and continuously operatively connected with said feed roller;
• said coupling means connecting a selected one of said output components to said feed roller when said cartridge is in place in said typing machine;
• said coupling means being arranged as a function of the type of the associated ribbon for connecting said feed roller to said selected one of said output components.