Drive mechanism for a timepiece calendar date display
AssigneeGlashütter Uhrenbetrieb GmbH
InventorsChristian Schmiedchen, Jürgen Franke
Life of this patent
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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.
Claims6
A drive mechanism for a day of the month display of a timepiece, this day of the month display comprising first and second indicators on which figures are affixed respectively indicating the units and the tens of said day of the month, these indicators being driven by a program wheel set, said program wheel set itself carrying a day of the month wheel having thirty one teeth, this day of the month wheel being driven in turn by the beak of a lever to make said day of the month wheel move forward by one step during a change of day of the month, wherein the beak of the lever is engaged between first and second teeth of the day of the month wheel and wherein at the time of the day of the month change, said beak is initially disengaged from said first and second teeth to fall then between the second and third teeth of said wheel and thereby make said day of the month wheel move forward by one step.
Dependencies are inferred from the claim text.