Abstract: An erasing ribbon is guided by the same vibrator as the typing ribbon behind the lower part of the typing ribbon. An erasing key acts on the back-spacing mechanism of the typewriter and on an element which suppresses the carriage escapement during a correction cycle initiated by any one of the typing keys. The necessary settings are made by a slide which stores the erasing key command. In particular, the slide acts on a lever which varies the stroke of the ribbon vibrator for selecting the erasing ribbon, also on a device which causes the erasing ribbon to advance and on a mechanism which inhibits the escapement during the execution of the correction cycle. The setting slide is then returned to rest by the first typing key operated after the erasing cycle. A correction selection lever acts on the lever which varies the stroke of the ribbon vibrator and selects permanently the erasing ribbon independently of the erasing key for a forward erasing of the characters of one or more words.