PURPOSE: To make it possible to omit a ribbon feed exclusive wire, by providing a drive gear, of which the rotary direction is changed corresponding to the change-over of the rotary direction of a timing belt, to a carrier while rotating ribbon driving shaft through a power transmission mechanism.

CONSTITUTION: When a timing belt 4 is moved to an A-direction in the side of a carrier shaft and moved to a B-direction in the opposite side, a carrier 2 moves and a drive gear 6 and a relay gear 7 are simultaneously rotated while an idler lever 14 is revolved by the friction force of a support shaft 8 to bring an idler gear 15 into engagement with a transmission gear 9 and transmission gears 9W11 are successively rotated to feed a ribbon by a ribbon driving shaft 13. In the next step, when the belt 14 is reversed and the carrier 2 is sent to the opposite direction, the idler lever 14 is revolved to the opposite direction and gears 15, 10, 11, 13 are rotated while the gear 9 races to feed the ribbon to the opposite direction. By this mechanism, a ribbon feed exclusive wire can be omitted and the numbers of parts and assembling processes can be reduced.