Method for manufacturing horological balance springs
AssigneeNivarox-FAR S.A.
InventorsGeoffrey Chassin, Pierre Cusin
Life of this patent
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Abstract
There is provided a method for manufacturing a batch of horological balance springs (2a), the average of whose stiffnesses lies within a predetermined range, and the method includes forming in a wafer the horological balance springs (2b, 2c) with dimensions that differ from the dimensions required to obtain the batch of horological balance springs (2a), the average of whose stiffnesses lies within the predetermined range, determining the stiffnesses of the systems, computing a dimensional correction to be applied to the horological balance springs, and modifying the dimensions of the horological balance springs (2b, 2c) formed, on the basis of a dimensional correction computed to obtain the batch of horological balance springs (2a).
Claims12
A method for manufacturing a batch of horological balance springs (2a), comprising an average stiffness within a predetermined range, which method comprises the following steps of:
- a) forming, in a wafer (1), horological balance springs (2b, 2c), of the batch of horological balance springs (2a), with dimensions that differ from dimensions required to obtain the batch of horological balance springs (2a) comprising the average stiffness within said predetermined range;
- b) forming, in the wafer (1), systems (3) for indicating a reference stiffness for determining stiffnesses of the batch of horological balance springs (2a);
- c) determining the stiffnesses of said systems (3) formed;
- d) computing a dimensional correction to be applied to the horological balance springs (2b, 2c) formed, on the basis of the determined stiffnesses of said systems (3);
- and
- e) modifying the dimensions of the horological balance springs (2b, 2c) formed, on the basis of a dimensional correction computed to obtain the batch of horological balance springs (2a), the average of whose stiffnesses lies within said predetermined range,
- wherein the systems (3) comprise a first system (3) and a second system (3),
- wherein the horological balance springs (2b, 2c) comprise a first horological balance spring (2b, 2c) and a second horological balance spring (2b, 2c), and
- wherein forming, in the wafer (1), the systems (3) comprises:
- arranging the first system (3) closer to the first horological balance spring (2b, 2c) than to any other of the horological balance springs (2b, 2c), and
- arranging the second system (3) closer to the second horological balance spring (2b, 2c) than to any other of the horological balance springs (2b, 2c).
Dependencies are inferred from the claim text.