Serial dot printer with movable head-carrying carriage

A serial dot printer including a transversely movable carriage, a printing head capable of printing dots during each stroke of the carriage in both directions, a closed loop toothed belt trained round a pair of toothed pulleys so as to have two parallel runs extending in the direction of movement of the carriage, a continuously rotating electric motor for driving one of said pulleys in one rotating direction, and drive means attached to said belt and coupled to said carriage so as to move the carriage alternately in said two directions when said drive means moves along a first one and a second one of said runs, said drive means including an element secured to said belt in a gap between two consecutive teeth thereof, said pulleys being each one provided with at least one groove to house said element when said drive means runs round said pulleys, said pulleys being each one provided with a pair of circular flanges, wherein said drive means includes a block member slidably guided on a pair of rectilinear bars provided on said carriage perpendicular to its displacement direction, a C-shaped member embracing said belt and having a pair of limbs each one substantially coplanar with one flange of each of said pair of flanges, each one of said limbs being adapted to engage a recess provided in each flange coplanar thereto, said element being formed of a pin carried by said block member and mounted on said limbs as to block said C-shaped member on said belt, said pin being rotatably coupled at least with one of said C-shaped member and said block member so as to cause said C-shaped member to rotate when moving round said pulleys.