Title:
ARC-SHAPED COIL SPRING MANUFACTURING METHOD AND MANUFACTURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/026373
Kind Code:
A1
Abstract:
[Problem] In order to solve a remaining problem of reducing manufacturing time in an arc-shaped coil spring manufacturing method and manufacturing device employing a cam, the present invention addresses the problem of providing a concrete technical means for making it possible, focusing on a clamp structure, for manufacture to be performed in a continuous operation in only one direction without switching the feeding direction with respect to the operation of a pressing member.
[Solution] An arc-shaped coil spring manufacturing method comprises: a clamping step; an end portion detecting step; a rotational angle position determination step; a pitch feeding step; and a pressing member knocking step. A clamp having a nail portion with a tip bent downward in L-shape is used. The clamp is placed and fixed between active wire diameters comprising the first and the second active numbers of windings from the seating face on one side of a straight tubular coil spring. Knocking of the pressing member is operated using a cam. Operations during the pitch feeding step and the pressing member knocking step are speed-controlled and position-controlled to form an arc-shaped coil spring having an arbitrary curvature.
Inventors:
SUGITA TAKESHI (JP)
Application Number:
PCT/JP2018/017849
Publication Date:
February 07, 2019
Filing Date:
May 08, 2018
Export Citation:
Assignee:
TEC CO LTD (JP)
International Classes:
B21F35/00; F16F1/06
Foreign References:
| JP6113891B1 | 2017-04-12 | |||
| EP1533053A1 | 2005-05-25 | |||
| JP2005349447A | 2005-12-22 | |||
| JP2006142374A | 2006-06-08 | |||
| JPS59199135A | 1984-11-12 | |||
| JPH1119743A | 1999-01-26 |
Attorney, Agent or Firm:
KAMIYOSHIHARA,Hiroshi (JP)
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