A device for advancing the strip of color machines to write a desk, teleprinters or printers of clinical

摘要

Apparatus for advancing the ribbon in printing machines such as office typewriters, teleprinters and the like, such apparatus including a pair of ribbon reels mounted on a type carrier carriage which is movable relative to a paper carriage, and a cable looped around a pair of drive rollers connected respectively to the ribbon reels for joint rotation. One end of the cable is held fast in relation to the paper carriage while the other end is connected to a selectively movable armature of an electro-magnet for alternately tensioning and relaxing the cable, whereby the ribbon reels are rotated by the cable as the type carrier carriage moves in an operative or printing direction relative to the paper carriage, but are not rotated as the type carrier carriage moves back in an operative direction to begin another printing cycle. A pair of cables and armatures may be used to effect reverse winding of the ribbon on the reels, and a single, double-acting armature may serve to tension and relax both cables.