Patent ID: 9056349
Filing Date: 2015-06-16
Classification: B21F

Abstract:
1. A coil-spring manufacturing apparatus comprising: a first roll; a second roll which is arranged on a same side as a side on which the first roll is arranged in relation to a conveying path for conveying a coil wire material and which is arranged downstream of the first roll in a conveying direction of the coil wire material; a third roll which is arranged across the conveying path on a side opposed to the side on which the first roll and the second roll are arranged; and a pitch tool which moves back and forth along a screwing direction of a coil spring, wherein the coil spring is manufactured by bending the coil wire material at a predetermined curvature by the first roll, the second roll, and the third roll, and by shaping the bent coil wire material at a predetermined pitch, and wherein the second roll is movable back and forth along the screwing direction of the coil spring, and is tiltable about, as an axis of rotation, a line parallel to the conveying path of the coil wire material.