Drive mechanism for a timepiece calendar date display

Details Drive mechanism for a timepiece calendar date display Drive mechanism for a timepiece calendar date display

2006-12-05

2010-11-23

Miska, Vit W (Department: 2833)

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

Reexamination Certificate

active

07839724

ABSTRACT:
A calendar date display comprises a ten-day indicator (2) and a unit indicator (1) driven by a program drive (8), which is provided with a calendar date display (9) whose toothing is engaged with the beak (15) of a lever (16) in such a way that a wheel is moved one step forward by one date number change. Between each calendar number change, the beak (15) is engaged between the first and second teeth (11, 12) of the wheel (9). At the time of the calendar number change, the beak (15) is disengaged from said first and second teeth (11, 12) in such a way that it is engaged between the second and third (12, 13) teeth of the wheel (9), thereby moving said wheel one step forward.

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International Search Report issued in corresponding application No. PCT/EP2006/069305.

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