Device for the fine adjustment of a balance spring

Abstract

The present invention provides a device for the fine adjustment of a balance spring. In order particularly to put a watch into beat and adjust the isochronism, in addition to the poising screws ( 2 a, 2 b) of the balance ( 1 ) and the fine adjusting screw ( 7 ) pressing on the index tail 20 a to alter the orientation of the index ( 20 ), the device includes, on the one hand, two screws ( 19, 29 ) respectively fixed in the balance cock ( 10 ) and in the index ( 20 ) to manoeuvre clamps by means of L-shaped rocking elements ( 13, 23 ) to fix the end of the balance spring and define its useful length, and on the other hand, a screw ( 9 ) for immobilising the index ( 20 ) in a determined position, these three screws ( 9, 19, 29 ) enabling a fine adjustment to be carried out.

Description

technical field

[0001] The present invention relates to a fine-tuning device for a balance with hairspring that includes a specially arranged index assembly to make adjustment of isochronism easier and more reliable over a long period of time. The invention also relates to a method of fine-tuning, ie a sequence of operations from positioning the watch to final adjustment, the initial and final operations being possible with a single fine-tuning device thanks to the particular arrangement described. Background technique

[0002] The regulator assembly consists, in a known manner, of a set of parts mounted on the balance-cock, namely a hairspring stud for securing the end of the outer curved part of the hairspring, and a friction fit on the top balance A regulator on the end piece consisting of an extension outside the balance half-cock for the pin and / or buckle and a regulator tail at the other end, usually a screw against a The restoring force of the spring acts on the tail...

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