公开(公告)号：US09056349B2

公开(公告)日：2015-06-16

申请号：US13750039

申请日：2013-01-25

Applicant: NHK Spring Co., Ltd.

Inventor： Akira Katsuyama ,  Takayuki Morishima ,  Takashi Yajima ,  Yuji Mori ,  Kotaro Nukui

IPC: B21F3/02 ,  B21F35/00

CPC classification number: B21F3/02 ,  B21F35/00

Abstract: A coil wire material is bent by a first roll, a second roll, and a third roll. The bent coil wire material is pressed in a screwing direction, to shape a coil spring having a desired diameter and a pitch. A desired pitch can be accurately formed in a manner that a second roll provided on a downstream side of a conveying direction of the coil wire material is configured to be able to move hack and forth along the screwing direction of the coil spring and to be tiltable about an axis of rotation parallel to the conveying direction of the coil wire material.

Abstract translation: 线圈线材由第一辊，第二辊和第三辊弯曲。 弯曲的线圈线材沿着螺旋方向被按压，以形成具有所需直径和间距的螺旋弹簧。 期望的间距可以以使得设置在线圈线材的输送方向的下游侧上的第二辊构造成能够沿着螺旋弹簧的螺合方向前后移动并且可倾斜的方式精确地形成 围绕平行于线圈线材料的输送方向的旋转轴线。