US 6,118,734 AGranted

Train of clockwork with perpetual Julian date

AssigneeGirard-Perregaux S.A.

InventorsClaude Ray, Christian Taillard

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Abstract

A train of clockwork with perpetual Julian date, characterized in that it comprises an adjusting device for causing a date indicator (2) to carry out adjusting steps, for automatically taking into account months with 28, 29, or 30 days, said adjusting device comprising a rotating cam (26) driven at least one step every twenty-four hours, said cam (26) having an outline (28) for controlling a sensor (30) bringing about: the oscillating motion of a mobile element (32) provided with a click spring system (34), for moving forward the date indicator (2) by the required supplementary step(s), and the forward movement of said cam (26) for causing it to make the number of steps equal to the number of adjusting steps of said indicator (2) for carrying out one complete round every year.

Claims25

Dependent claims

Timepiece movement provided with a perpetual-date calendar mechanism, comprising a driving device of a date indicator, having driving means to make said indicator advance by one jump every 24 hours, characterized in that it further comprises an adjusting device, able to make this indicator perform adjusting steps, to automatically allow for months with 28, 29 or 30 days, this adjusting device comprising a rotary cam, driven at least one step every 24 hours, this cam having a profile which controls a sensor, bringing about:

on the one hand, the oscillating movement of a mobile assembly provided with a pawl system, to make the date indicator advance by the required supplemental adjusting step or steps, and
on the other hand, the advancement of said cam to make it perform a number of steps equal to the number of adjusting steps of said indicator so that it performs one complete turn per year.

Dependencies are inferred from the claim text.