Train of clockwork with perpetual Julian date

Horology: time measuring systems or devices – With calendar indicator – Movable ring or disk

Patent

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Details

368 38, G04B 1920, G04B 1924

Patent

active

061187348

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a timepiece movement provided with a perpetual-date calendar mechanism, comprising a device for driving a date indicator, which device comprises a driver capable of making the indicator advance one jump every 24 hours.


BACKGROUND OF THE INVENTION

Field of the Invention
This movement further comprises an adjusting device for causing this indicator to carry out supplemental adjusting steps, in order to automatically allow for months with 28, 29 or 30 days.
More particularly, and in advantageous fashion, this movement is designed to be able to easily adapt on a movement comprising a driving device of a conventional date display.
Moreover, the movement according to the invention makes it possible to display supplemental day, month and/or year information, without making major modifications to the movement.
There is already known from the Swiss patent CH 574 125 a control mechanism of a semiperpetual calendar, comprising a date ring whose single lever accomplishes the intermediate daily advance and the correction, at the end of certain months, by means of a mechanism. This correction is done by means of a mechanism comprising a month cam in connection with a device for locking the date ring. Such a mechanism has the disadvantage of being complex and costly to implement.
Furthermore, this mechanism is semiperpetual, that is, it does not take into account leap years and it requires the use of a day display and monthly correction mechanism.
Furthermore, there is known from patent EP 0 052 070 a perpetual driving device for the date ring, comprising a month cam and a year cam to perform the required correction of the display at the end of months with fewer than 31 days. This design is complicated and cannot be adapted to a movement comprising a traditional date display device. Furthermore, this system does not allow the display of information supplemental to the date display, such as the day, months, and the leap year.
The Swiss patent CH 169 64 describes a mechanism which does not take account of leap years and which comprises a system of small-dimension, variable-notch cams, arranged between the center of the movement and its periphery. The small dimensions of this cam system do not allow one to obtain satisfactory precision.


SUMMARY OF THE INVENTION

Thus, the object of the present invention is to remedy the drawbacks of the aforesaid prior art by providing a timepiece movement with a perpetual calendar, which can be easily adapted to a movement already comprising a conventional date display device, which offers great precision of functioning and which, moreover, allows the display of supplemental information along with the date, such as the month and/or leap years and non-leap years, as well as a 24 h display which can be initialized after the clock has stopped.
Thus, the invention concerns a timepiece movement provided with a perpetual-date calendar mechanism, comprising a device for driving a date indicator, this device comprising driving means which can make said indicator advance by one jump every 24 hours. This movement is characterized in that it further comprises an adjusting device, arranged to make this indicator carry out supplemental adjusting steps, in order to automatically allow for months of 28, 29 or 30 days, this device comprising a rotary cam driven at least one step every 24 hours, this cam having a profile for controlling a sensor, bringing about:
on the one hand, the oscillating movement of a mobile assembly provided with a ratchet 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 carry out a number of steps equal to the number of adjusting steps of said indicator so that it performs one complete turn every year.


BRIEF DESCRIPTION OF THE DRAWINGS

Other characteristics and advantages of the invention will appear from reading the following detailed description, making reference to the enclosed drawings, which are given solely by way of example, an

REFERENCES:
patent: 3716983 (1973-02-01), Tanaka et al.
patent: 3827234 (1974-08-01), Imanishi
patent: 4026100 (1977-05-01), Kume et al.

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