Cartridge for a printing ribbon

摘要

A cartridge for a printing ribbon for a typewriter having a character-carrying disc comprises a casing and two oscillating arms between the ends of which a run of the ribbon extends in a straight line on the outside of the casing between the disc and the platen. The arms oscillate from a rest position in which they make the typing point visible, to three or more working positions in which they make it possible to print using one of three tracks of the ribbon. The two oscillating arms are pivoted by means of pins on seats of fixed supports of the casing. Pivotally mounted at the free end of each arm is a guide element, a stem of the guide element being received in a sleeve of the arm. Each guide element is thus capable of modifying its angular position with respect to the respective arm in response to the selection movement so that the ribbon is always held in tension in a uniform manner, irrespective of the track selected.