The ribbon cartridge includes a re-inker assembly having a pair of idler rollers defining a nip therebetween through which the print ribbon is advanced. The idler rollers have teeth intermeshing one with the other and with the print ribbon therebetween such that the idler rollers are positively driven when the ribbon is advanced. One of the idler rollers lies in contact with a re-inker roller or wick for transferring ink from the re-inker roller or wick to the print ribbon as the ribbon passes through the nip of the idler rollers.