shown in fig1 the cable 20 is guided along the side wall 13b when tension is applied to the cable 20 the turn portions 12a engaged with the inclined walls 13c in the guide section 13 are more firmly engaged with these walls 13c further the end portion of the cable 20 located on the carriage side is bent and the connecting member 14 swings toward the opposite side to the platen 1 with the bending of the cable 20 and during the movement of the carriage 5 the amount and direction of the swing motion of the connecting member 14 continuously vary with a change in the moving position of the carriage 5 therefore no excess tension applies on the one end portion 20a and the other end portion 20b of the cable 20 with the above structure of this invention the bending radius of the tube 12 and the wires 11 disposed in the tube i e the bending radius r of the cable 20 is greater than the one involved in the prior art this prevents an excess bending stress from being applied to the cable 20 and improves the wearability of the cable 20 when the.