PURPOSE: To develop a coil end automatically and rapidly by controlling a driving system in response to operations of a up-and down-moving body and traveling means.

CONSTITUTION: A microcomputer having an actuating command and incorporating the output of an encorder indexes a tangential and normal direction of a coil end by reading the turning angle of a up- and down-moving mast 6 or the existent angle of a clamp device 7. The microcomputer calculates the resultant vector of the prescribed velocity vectors in the tangential and normal direction and resolves the resultant vector into X and Y direction components and performs analog conversion of the resolved components with respect to the magnitudes and directions, and outputs the results as velocity commands to each traveling and traversing controllers. Each drive controller compares the given velocity commands with feed back inputs and drives and controls the motors in rotating numbers corresponding to the velocity commands. On starting the displacement of the coil end, the up-and down-moving mast 6 begins to turn by the reaction of a steel plate. The coil end automatically continues to develop out at a fixed developing speed while receiving appropriate tension.