DRIVE MECHANISM FOR TWO COAXIAL CALENDAR MEMBERS IN WATCH MOVEMENT

A drive mechanism for two coaxial calendar members meant to rotate in stepwise manner about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating one of each of the calendar members, a calendar wheel connected to the gear-train and coaxial wit...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	BRON A,CH, ZAUGG R,CH, SCHALLER K,CH
Format:	Patent
Sprache:	eng
Schlagworte:	HOROLOGY MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL MECHANICALLY-DRIVEN CLOCKS OR WATCHES PHYSICS TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
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Beschreibung
Zusammenfassung:	A drive mechanism for two coaxial calendar members meant to rotate in stepwise manner about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating one of each of the calendar members, a calendar wheel connected to the gear-train and coaxial with the drive member, a coupling with angular play between the calendar wheel and the drive member, a cam rigidly connected to the drive member, a lever operating in concert with the cam, and a spring acting on the lever such that it will ensure an instantaneous jump of the two calendar members by rotation of the drive members after the latter has been brought into a given orientation by the calendar wheel. The invention is further characterized in that the contour of the cam is provided with a retaining notch operating in concert with the lever and limiting the rotation of the drive member under the influence of the spring.