Timepiece and, in particular, a wrist watch

Details Timepiece and, in particular, a wrist watch Timepiece and, in particular, a wrist watch

G - Physics

04

B

G04B 1/00 (2006.01) G04B 19/02 (2006.01) G04B 19/08 (2006.01)

Patent

CA 2196587

The control mechanism of means for displaying hours and minutes includes a tilting member (15) biasing against, under the effect of a return spring and via a pawl (18), a spirally shaped cam (12) located at the center of the movement, and which makes a full rotation in one hour. The tilting member (15) is lifted progressively by the action of the cam (12) to fall back instantly, once each hour. During this instantaneous falling back motion of the tilting member (15), a toothed sector (23) carried by the same drives, via a train of gears (24, 25, 26), a central pinion (27) carrying the minute hand. Thus, once at each hour, the minute hand is instantly reset to its initial position. The tilting member (15) carries a pawl (30) cooperating, at each of the instant falling back motions of the tilting member, with a star wheel with twelve branches, which rotates at the center of the movement and which carries a disk indicating hours, of which the display it thus of the so-called "incremental" type .

Le mécanisme de réglage d'un moyen d'affichage de l'heure et des minutes comporte un élément basculant (15) s'appuyant, sous l'effet d'un ressort de rappel et via un levier (18), contre une came de forme sphérique (12) située au centre du mouvement, et qui fait une rotation complète en une heure. L'élément basculant (15) s'élève progressivement sous l'action de la came (12) et retombe instantanément, une fois par heure. Pendant ce mouvement de chute instantanée de l'élément basculant (15), un secteur denté (23) est entraîné par les mêmes organes, via un train de roues dentées (24, 25, 26), un pignon central (27) entraînant l'aiguille des minutes. Ainsi, une fois par heure, l'aiguille des minutes est instantanément ramenée à sa position initiale. L'élément basculant (15) entraîne un levier (30) coopérant, à chaque fois que l'élément basculant retombe, avec une roue de l'étoile à douze branches, qui tourne au centre du mouvement et qui entraîne un disque indiquant les heures, dont l'affichage est donc du type dit « incrémentiel ».

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