Timepiece movement comprising a date correction mechanism

Patent metadata

Field	Value
Publication number	US-9785115-B2
Application number	US-201615226254-A
Country	US
Kind code	B2
Filing date	Aug 2, 2016
Priority date	Sep 15, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A timepiece movement including a first lever bearing a first drive wheel, a second lever bearing a second wheel for time setting, and a third lever bearing a date correction mechanism. The third lever is mounted to pivot on the second lever and arranged to move between a meshing position, in which the date correction mechanism cooperates with the date display mechanism, and a retraction position, in which the date correction mechanism is disconnected from the date display mechanism. The first and second levers are arranged to occupy at least one date correction position, in which the first drive wheel is kinematically connected to the date correction mechanism and is not kinematically connected to the second wheel for time setting, and a time setting position, in which the first drive wheel is kinematically connected to the second wheel for time setting and is not kinematically connected to the date correction mechanism, wherein the position of the second lever is modified by cooperation between the first lever and the second lever.

First claim

What is claimed is:

1. A timepiece movement comprising a control stem, a winding mechanism for winding the movement, a date display mechanism and a time display mechanism, wherein the timepiece movement comprises a first lever bearing a first drive wheel capable of being kinematically connected to the control stem, a second lever bearing a second wheel for time setting arranged to cooperate with the time display mechanism and capable of being kinematically connected to the first drive wheel, and a third lever bearing a date correction mechanism capable of being kinematically connected to the first drive wheel and also to the date display mechanism, wherein said third lever is mounted to pivot on the second lever and arranged to move between a meshing position, in which the date correction mechanism cooperates with the date display mechanism, and a retraction position, in which the date correction mechanism is disconnected from the date display mechanism, and wherein the control stem and said first lever and said second lever are arranged to occupy three positions:
a winding position, in which the control stem is kinematically connected to the winding mechanism for winding the movement and is not kinematically connected to the first drive wheel,
a date correction position, in which the control stem is kinematically connected to the first drive wheel, and the first lever and the second lever are positioned so that said first drive wheel is kinematically connected to the date correction mechanism and is not kinematically connected to the second wheel for time setting,
and a time setting position, in which the control stem is kinematically connected to the first drive wheel and the first lever and the second lever are positioned so that said first drive wheel is kinematically connected to the second wheel for time setting and is not kinematically connected to the date correction mechanism,
wherein the position of the first lever is modified by cooperation between the control stem and the first lever and the position of the second lever is modified by cooperation between the first lever and the second lever.

2. The timepiece movement according to claim 1 , wherein the first lever bears a positioning pin arranged to cooperate with the second lever, the cooperation between said positioning pin and the second lever defining the position of said second lever.

3. The timepiece movement according to claim 1 , wherein a return spring is provided and is arranged cooperate with the second lever and to ensure contact between said second lever and the first lever.

4. The timepiece movement according to claim 1 , wherein the second lever additionally bears a connecting wheel set comprising a third connecting wheel capable of being kinematically connected to the first drive wheel and a connecting pinion cooperating with the date correction mechanism.

5. The timepiece movement according to claim 4 , wherein the second lever comprises, at one end, a first staff, on which the second wheel for time setting is mounted, and, at a second end, a second staff, on which are mounted the third lever and also the connecting wheel set, being fixed to said second staff.

6. The timepiece movement according to claim 1 , wherein the third lever comprises a support arm, on which the date correction mechanism is mounted to pivot, and an arm bearing a stop element.

7. The timepiece movement according to claim 6 , wherein a support element is provided that is arranged to rest on the stop element of the third lever when the control stem and the first lever and the second lever are in time setting position in order to cause the third lever to pivot into its retraction position disconnected from the date display mechanism.

8. The timepiece movement according to claim 1 , wherein the date correction mechanism comprises a fourth correction wheel capable of being kinematically connected to the first drive wheel and a corrector element actuated by said fourth correction wheel and comprising at least one correction finger capable of cooperating with the date display mechanism.

9. The timepiece movement according to claim 5 , wherein the third lever is frictionally mounted on the second staff of the second lever in order to be fixed to the second staff during correction of the date to occupy the meshing position with the date display mechanism, when the control stem is turned in one direction, and occupy its retraction position disconnected from the date display mechanism, when the control stem is turned in the other direction, and in order to be disengaged from the second staff during the time setting to pivot into the retraction position disconnected from the date display mechanism when its stop element cooperates with a support element.

10. The timepiece movement according to claim 1 , wherein a holding plate is provided that has an opening for defining the path of the third lever.

Assignees

• Eta Sa Mft Horlogere Suisse

Inventors

• Philippon David
• Mertenat Olivier
• Wyssbrod Baptist

Classifications

• G04B3/003 Primary

  by lever mechanism · CPC title

• G04B19/25

  Devices for setting the date indicators manually · CPC title