Method for press-rolling a timepiece mainspring
AssigneeNivarox-FAR S.A.
InventorsJonas VANNOD, Christian CHARBON
Life of this patent
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Abstract
Method for press-rolling a mainspring, from a wire comprising a pre-formed eye, utilising 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.
Claims10
A method for press-rolling a mainspring, from a wire comprising an eye pre-formed in a first operation, wherein there is implemented a roller press comprising a first support and guide means exerting a force on said 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, in a second press-rolling operation, to wind, beyond said eye, an accumulation area with a curvature opposite to that of said eye, and wherein, during the advance of said wire, the position of said first contact area is gradually modified moving away from said second and third contact areas, to vary the press-rolling diameter from a first minimum value to a second maximum value at a neck junction between said accumulation area and said eye.
Dependencies are inferred from the claim text.