COILING MACHINE, METHOD FOR MANUFACTURING COIL SPRING, AND COIL SPRING

Title:

COILING MACHINE, METHOD FOR MANUFACTURING COIL SPRING, AND COIL SPRING

Document Type and Number:

WIPO Patent Application WO/2020/138376

Kind Code:

A1

Abstract:

A coiling machine (10) is provided with feed rollers (11a, 11b) for moving a wire (1), a wire guide (12), a first forming roller (13), a second forming roller (14), a pitch tool (21), a cutting mechanism (23), and a support mechanism (24) for supporting the wire (1). The cutting mechanism (23) has a cutting rotor (22). The wire (1) emerging from the wire guide (12) is formed into a helical shape by the first forming roller (13), the second forming roller (14), and the pitch tool (21). When a length corresponding to a single coil spring is formed, the cutting rotor (22) moves in the radial direction of the wire (1), and the wire (1) is thereby cut. Between the second forming roller (14) and the pitch tool (21), the cutting rotor (22) cuts the wire (1) supported by the support mechanism (24), in the radial direction of the wire (1).

Inventors:

FURUSE TAKESHI (JP)
HAGIWARA DAIKI (JP)
SATO TAKUYA (JP)
YAMAUCHI YUICHIRO (JP)

Application Number:

PCT/JP2019/051329

Publication Date:

July 02, 2020

Filing Date:

December 26, 2019

Export Citation:

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Assignee:

NHK SPRING CO LTD (JP)

International Classes:

B21F3/02; B21F3/06; B21F11/00; B21F35/00

Domestic Patent References:

WO2016208033A1

2016-12-29

Foreign References:

JP2016155162A	2016-09-01
JP2003010937A	2003-01-15
FR1211009A	1960-03-11
JP2020032457A	2020-03-05
JPS6250028A	1987-03-04
JP4317252B2	2009-08-19
JPS6250028A	1987-03-04
JP4317252B2	2009-08-19

Other References: