APPARATUS FOR MANUFACTURING COIL SPRING

Title:

APPARATUS FOR MANUFACTURING COIL SPRING

Document Type and Number:

WIPO Patent Application WO/2012/015009

Kind Code:

A1

Abstract:

The present invention forms a coil spring having desired diameter and pitch by bending a coil wire rod (30) using a first roll (32), a second roll (34) and a third roll (36), and pressing in the coiling direction the bent coil wire rod (30) using a pitch tool (90). The second roll (34) disposed in the downstream in the transfer direction of the coil wire rod (30) is configured such that the second roll can move forward and backward in the coiling direction of the coil spring and that the second roll can tilt in the direction of the rotating axis parallel to the transfer direction of the coil wire rod (30), thereby accurately forming the desired pitch.

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Inventors:

KATSUYAMA AKIRA (JP)
MORISHIMA TAKAYUKI (JP)
YAJIMA TAKASHI (JP)
MORI YUJI (JP)
NUKUI KOTARO (JP)

Application Number:

PCT/JP2011/067362

Publication Date:

February 02, 2012

Filing Date:

July 28, 2011

Export Citation:

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Assignee:

NHK SPRING CO LTD (JP)
KATSUYAMA AKIRA (JP)
MORISHIMA TAKAYUKI (JP)
YAJIMA TAKASHI (JP)
MORI YUJI (JP)
NUKUI KOTARO (JP)

International Classes:

B21F3/02; B21F35/00; F16F1/06

Foreign References:

JPH09136131A	1997-05-27
US20020104353A1	2002-08-08
JPS5725233A	1982-02-10

Other References: