Title:
METHOD FOR PRESS-ROLLING TIMEPIECE MAINSPRING
Document Type and Number:
Japanese Patent JP2017217697
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To press-roll a spring that operates reliably.SOLUTION: There is provided a method for press-rolling a mainspring from a wire 1 comprising a pre-formed eye. A roller press 20 comprising first support and guide means 10 exerting a force F on the wire in a first contact area A located between a second contact area B in second support and guide means 12 and a third contact area C in third support and guide means 13 is utilized to wind, in an area beyond the eye, an accumulation area with a curvature opposite to that of the eye as the wire advances. The position of the first contact area is gradually moved away from the second and third contact areas, so as to vary the press-rolling radius from a minimum first value R1 to a maximum second value R2 at a neck junction between the accumulation area and the eye.SELECTED DRAWING: Figure 4
Inventors:
JONAS VANNOD
CHARBON CHRISTIAN
CHARBON CHRISTIAN
Application Number:
JP2017104208A
Publication Date:
December 14, 2017
Filing Date:
May 26, 2017
Export Citation:
Assignee:
NIVAROX SA
International Classes:
B21F3/08; B21F35/00; F16F1/10; G04B1/14; G04D3/00
Domestic Patent References:
| JPS63106540U | 1988-07-09 | |||
| JP337014810B | ||||
| JPH09206866A | 1997-08-12 | |||
| JPS5434332U | 1979-03-06 | |||
| JP2012030257A | 2012-02-16 | |||
| JPS63106540U | 1988-07-09 | |||
| JP337014810B | ||||
| JPH09206866A | 1997-08-12 | |||
| JPS5434332U | 1979-03-06 | |||
| JP2012030257A | 2012-02-16 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa