Method for press-rolling a timepiece mainspring
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United States of America Patent
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Oct 29, 2019
Grant Date -
Dec 14, 2017
app pub date -
Jun 6, 2017
filing date -
Jun 10, 2016
priority date (Note) -
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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.
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