Method for press-rolling a timepiece mainspring
AssigneeNivarox-FAR S.A.
InventorsJonas Vannod, Christian Charbon
Life of this patent
Estimating the term…
Abstract
Method for press-rolling a mainspring, from a wire comprising a pre-formed eye, utilizing a roller press comprising a first support and guide means exerting a force on the wire in a first contact area located between a second and a third contact area comprised in a second and a third support and guide means, in order to wind, beyond the eye, an accumulation area with an opposite curvature to that of the eye, and wherein, as the wire advances, the position of the first contact area is gradually moved away from the second and third contact areas, to vary the press-rolling radius from a first minimum value to a second maximum value at a neck junction between the accumulation area and the eye.
Claims11
A method for press-rolling a mainspring, from a wire having an eye with a first curvature pre-formed in a first operation, comprising:
- using a roller press comprising a first support and guide means to exert a force on said wire in a first contact area of the wire, the first contact area being located between a second and a third contact area of said wire with a second and a third support and guide means, respectively, in a second operation to wind, beyond said eye, an accumulation area with a second curvature opposite to the first curvature of said eye, said first contact area being on a first side of the wire and the second and third contact areas being on a second side of the wire opposite to said first side, and
- advancing the wire and, during the advance of said wire, gradually moving the position of said first contact area in a direction toward said second and third contact areas, to vary a press-rolling diameter from a first minimum value to a second maximum value at a neck junction between said accumulation area and said eye;
- wherein said first contact area is located between the second and third contact areas in a longitudinal direction of said wire.
Dependencies are inferred from the claim text.