motor 148 fig6 is reversed and through the reverse rotation of the ball screw shaft 144 the bed 132 is retracted slightly leftward to thereby provide a desired space between the end face 108 of the rotary spindle 22 and the coil end on which a pig tail has been formed thereafter the air cylinder 158 fig7 is actated to move the pressing member 156 into the space through the pivotal movement of the link lever 162 as depicted by the arrow in fig7 the flattening operation may then be started for the coil spring 10 to this end the motor 148 is driven again in the forward direction with the other end of the coil spring 10 held by the first clamping means 12 to thereby move the bed 132 axially forwardly upon forward movement of the bed 132 the pressing member 156 contacts and presses the last turn at the other end of the coil spring 10 to form a plane seat on the last turn the bed 132 is then returned by the reverse drive of the motor 148 and the pressing member 156 is also returned through the actuation of air cylinder 158 to its original position shown in fig7 finally the air cylinder 72 is deactuated to thereby remove the winding jig 16 from the space between coils of the coil spring 10 and the jaw 80 of the first clamping means 12 is raised to release the coil spring 10 from its.