Ink ribbon cassette including gear teeth configured to re-ink the ribbon

摘要

An ink ribbon cassette to be used in wire dot printer has an ink supply to lengthen a life cycle thereof. An ink ribbon is held between a drive gear and an idle gear and is delivered thereby. The ink supply contacts the idle gear so that ink is supplied from the idle gear to the ink ribbon. The teeth of the idle gear are specifically shaped such that the bottom of the teeth are formed in the shape of a circular arc so that the ink is uniformly supplied to the ink ribbon.