Vibration-resistant bearing mechanism for balance with hairspring, balance with hairspring and timepiece equipped with the mechanism

Abstract

The present invention provides a vibration-resistant bearing mechanism of a balance with hairspring, a balance with hairspring and a timepiece having the mechanism. The vibration-resistant bearing mechanism can minimize fluctuations in the movement of the balance with hairspring due to changes in the support state of the balance shaft. The anti-vibration bearing mechanism of the hairspring balance wheel of a watch has: a thrust jewel bearing, which works as a thrust bearing; a through-hole jewel bearing, which works as a radial bearing; a through-hole jewel bearing frame, which accommodates and supports the through-hole jewel bearing; The seat body accommodates and supports the through-hole jewel bearing frame, and has an engaging portion on the open end side of the large diameter; The thrust jewel bearing is elastically pressed to the through-hole jewel bearing frame for holding, and the thrust jewel bearing faces the end surface of the shaft supported by the vibration-resistant bearing mechanism and abuts against the end surface of the shaft by protruding outward. Curved convex composition. The convex surface of a thrust jewel is formed by a segment of a spherical surface.

Description

technical field [0001] The present invention relates to a vibration-resistant bearing mechanism of a hairspring balance, a hairspring balance equipped with the vibration-resistant bearing mechanism, and a timepiece equipped with the vibration-resistant bearing mechanism. Background technique [0002] The anti-vibration bearing mechanism supports the tenon parts at both ends of the balance shaft, so that the axial direction (and the extension of the balance shaft) of the balance with hairspring applied to the wrist due to the rapid movement of the wrist of the watch user or the like is applied to the wrist. direction parallel to) or lateral (direction at right angles to the direction in which the pendulum axis extends) is mitigated. As such a vibration-resistant bearing mechanism, a vibration-resistant bearing mechanism having the following components is known: a thrust jewel bearing; a through-hole jewel bearing; a through-hole jewel bearing frame for supporting the thrust j...

AI Technical Summary

Problems solved by technology

[0021] However, the diameters of the tenons 141F and 141R are usually at most about 0.1 mm, so it is difficult to maintain high dimensional accuracy of the shape of the convex curved surface. As the deviation of the shape increases, the possibility of a difference in the shape of the hairspring 155 between the flat posture PP1 and the reversed flat posture PP2 increases.

Therefore, the hairspring 155 that should originally extend spirally in a plane perpendicular to the central axis C of the balance shaft 140 becomes more or less a funnel, for example, when the timepiece is in the flat posture PP1 or in the inverted flat posture PP2 . shape, its spring characteristics change, and it is difficult to avoid the possibility of a difference in the number of steps.

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