EP4372481A1 - Mechanism for displaying the periods of an annual cycle of a timepiece - Google Patents

Abstract

One aspect of the invention relates to a mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) capable of being driven in a dragging manner by a time train (10) of a movement of watchmaking (1) characterized in that the mechanism for displaying the periods of an annual cycle (100) comprises: an indicator of the periods of an annual cycle (110); an annual cycle train (120) capable of being driven by said time train (10) of the clock movement (1), and of rotating the indicator of the periods of an annual cycle (110); the mechanism for displaying the periods of an annual cycle (100) being characterized in that the annual cycle gear (120) forms a gear train configured to have a ratio of 1:365.2 or a multiple ratio of 1: 365.2 between the time train (10) and the indicator of the periods of an annual cycle (110).

Description

Technical field of the invention

The field of the invention relates to mechanisms for displaying the periods of an annual cycle, for example the seasons, of a timepiece.

The invention also relates to a watch movement comprising such a mechanism for displaying the periods of an annual cycle.

The invention also relates to a timepiece, for example a wristwatch, comprising a watch movement comprising such a mechanism for displaying the periods of an annual cycle.

Technology background

The mechanisms for displaying an annual cycle, and in particular the periods of this annual cycle, make it possible to display information relating to a given period during an annual solar cycle.

The mechanisms for displaying the periods of an annual cycle are generally mechanisms with a jumping drive allowing an indicator to correspond to a graduation or division of a dial.

However, these mechanisms for displaying the periods of an annual cycle of the jumping type are not very precise because they do not make it possible to indicate to the user whether it is the beginning or the end of the displayed period of the annual cycle.

For example, when such a mechanism for displaying the periods of an annual cycle makes it possible to indicate the months, or for example the seasons, the hand indicates the current period (months or seasons) without however giving more information. specifies the remaining duration of the current period. By Consequently, the jump training of these displays generates a “display error” compared to the actual state of the current period.

In addition, these jumping display mechanisms consume energy and generate peaks in energy consumption during the jump which can temporarily disrupt the normal operation of the time train.

To remedy this drawback, mechanisms have been proposed for displaying the periods of an annual cycle of the dragging type driven continuously by the time train of the clock movement.

However, these trailing mechanisms are more complex to produce and more bulky because they require a large number of gears between the time train and the indicator of the periods of an annual cycle.

Most of the known mechanisms for displaying the periods of an annual cycle of the trailing type aim to provide a display of the precise annual cycle by getting as close as possible to the theoretical value of a solar year, in particular by using a multitude of mechanisms and particular gear ratios to get as close as possible to the theoretical value of a solar year.

We can cite for example the document RU 2767151 C1 which describes a mechanism for displaying a sky map comprising a first disk presenting a sky map which is rotated by a gear train of six meshes set in motion by an hour wheel, the gear train presenting the following reports: $$i=36/28\ast 42/12\ast 50/12\ast 51/12\ast 55/12\ast 50/25=2\ast 365.234375$$

We can also cite the document CH 679197 B5 which describes a zodiac indicator formed by a ring divided into twelve segments each bearing the name of a month and/or a sign of the zodiac. The ring goes around per year of 365.244008 days and is rotated from a power take-off making one revolution per hour.

These mechanisms for displaying the periods of an annual cycle, although precise, suffer from several drawbacks.

Firstly, as described previously, they are complex to produce and are bulky, which complicates their integration into watch movements.

Secondly, these display mechanisms composed of numerous parts require one or more energy sources to provide the required torques, in particular to avoid disrupting the operation of the time train.

Consequently, these complications for displaying the periods of an annual cycle are often limited to expensive, complex and bulky timepieces.

Consequently, there is a need to improve this type of mechanism for displaying the periods of a trailing annual cycle to respond to at least one of the problems mentioned above.

Summary of the invention

In this context, the invention proposes a mechanism for displaying the periods of an annual cycle of simplified design, small in volume, easy to integrate into a clock movement, and requiring little energy to be implemented.

• un indicateur des périodes d'un cycle annuel ;
• un rouage de cycle annuel apte à être animé par ledit rouage horaire du mouvement d'horlogerie, et à entrainer en rotation l'indicateur des périodes d'un cycle annuel ;

le mécanisme d'affichage des périodes d'un cycle annuel étant caractérisé en ce que le rouage de cycle annuel forme un train d'engrenages configuré pour avoir un rapport de 1 : 365,2 ou un rapport multiple de 1 : 365,2 entre le rouage horaire et l'indicateur des périodes d'un cycle annuel.To this end, the subject of the invention is a mechanism for displaying the periods of an annual cycle for a timepiece capable of being driven in a dragging manner by a time train of a watch movement, characterized in that the mechanism for displaying the periods of an annual cycle includes:

• an indicator of the periods of an annual cycle;
• an annual cycle train able to be driven by said time train of the clock movement, and to rotate the indicator of the periods of an annual cycle;

the mechanism for displaying the periods of an annual cycle being characterized in that the annual cycle gear train forms a gear train configured to have a ratio of 1:365.2 or a multiple ratio of 1:365.2 between the time train and the period indicator of an annual cycle.

According to the invention, the mechanism for displaying the periods of an annual cycle can be a mechanism for displaying months, weeks, constellations, signs of the zodiac, an equation of time, a running equation time, Christian festivities, equinoxes and solstices, climatic seasons, the inclination of the earth in relation to the sun, Chinese seasons or even solar periods.

Preferably, the mechanism for displaying the periods of an annual cycle is a mechanism for displaying solar periods.

Preferably, the mechanism for displaying the periods of an annual cycle is a mechanism for displaying the Chinese seasons.

Preferably, the mechanism for displaying the periods of an annual cycle is a celestial display mechanism.

Thus, with such a gear ratio, the indicator of the periods of an annual cycle makes a complete revolution in 365.2 days, requiring only a correction of one day every 22 years, which is largely suitable and satisfactory for displaying the periods of an annual cycle, and in particular the display of solar periods or Chinese seasons.

Thanks to this particular ratio, it is possible to simplify such a mechanism for displaying the periods of an annual cycle, and in particular to limit the gear train to a maximum of four meshes, composed of a maximum of three intermediate mobiles between the time train and the annual cycle wheel carrying the indicator of the periods of an annual cycle.

Thus, such a mechanism for displaying the periods of an annual cycle is easily implemented in watch movements, has improved reliability by reducing moving parts, and requires low energy consumption due to the different ratios. gear of the mobiles making up the gear train.

Consequently, such a mechanism for displaying the periods of an annual cycle can easily be implemented in a timepiece having a clockwork movement having a source of electrical energy and an electronic oscillator, for example quartz.

• le rouage horaire comporte une roue des heures faisant un tour en 12h, et en ce que le train d'engrenages du rouage de cycle annuel est apte à être engrené avec ladite roue des heures du rouage horaire, le train d'engrenages du rouage de cycle annuel étant configuré pour avoir un rapport de 1 : 2*365,2 entre la roue des heures du rouage horaire et l'indicateur des périodes d'un cycle annuel ;
• le rouage horaire comporte une roue de 24h faisant un tour en 24h, et en ce que le train d'engrenages du rouage de cycle annuel est apte à être engrené avec ladite roue des 24h du rouage horaire, le train d'engrenages du rouage de cycle annuel étant configuré pour avoir un rapport de 1 : 365,2 entre la roue de 24h du rouage horaire et l'indicateur des périodes d'un cycle annuel ;
• le rapport du train d'engrenages du rouage de cycle annuel possède les nombres premiers 83, 2, 11 au numérateur et 5 au dénominateur ;
• le rouage de cycle annuel comporte au maximum trois mobiles ;
• le rouage de cycle annuel comporte :
  • un premier mobile intermédiaire comportant une roue de premier mobile intermédiaire présentant 83 dents et un pignon de premier mobile intermédiaire présentant 8 dents ;
  • un deuxième mobile intermédiaire comportant une roue de deuxième mobile intermédiaire présentant 99 dents et un pignon de deuxième mobile intermédiaire présentant 15 dents ;
  • un troisième mobile intermédiaire comportant une roue de troisième mobile intermédiaire présentant 32 dents et un pignon de troisième mobile intermédiaire présentant 15 dents.
• le mécanisme d'affichage comporte en outre un mécanisme de réglage par friction de l'indicateur des périodes d'un cycle annuel ;
• une des roues des mobiles intermédiaires est montée en friction par rapport à son pignon.

In addition to the characteristics mentioned in the previous paragraph, the mechanism for displaying the periods of an annual cycle according to the invention may have one or more complementary characteristics among the following, considered individually or in all technically possible combinations:

• the time train comprises an hour wheel making one revolution in 12 hours, and in that the gear train of the annual cycle train is capable of being meshed with said hour wheel of the time train, the gear train of the hour train annual cycle being configured to have a ratio of 1:2*365.2 between the hour wheel of the time train and the indicator of the periods of an annual cycle;
• the time train comprises a 24-hour wheel making one revolution in 24 hours, and in that the gear train of the annual cycle train is capable of being meshed with said 24-hour wheel of the time train, the gear train of the time train annual cycle being configured to have a ratio of 1:365.2 between the 24-hour wheel of the time train and the indicator of the periods of an annual cycle;
• the gear train ratio of the annual cycle cog has the prime numbers 83, 2, 11 in the numerator and 5 in the denominator;
• the annual cycle cog has a maximum of three mobiles;
• the annual cycle cog includes:
  • a first intermediate mobile comprising a first intermediate mobile wheel having 83 teeth and a first intermediate mobile pinion having 8 teeth;
  • a second intermediate mobile comprising a second intermediate mobile wheel having 99 teeth and a second intermediate mobile pinion having 15 teeth;
  • a third intermediate mobile comprising a third intermediate mobile wheel having 32 teeth and a third intermediate mobile pinion having 15 teeth.
• the display mechanism further comprises a mechanism for adjusting by friction the indicator of the periods of an annual cycle;
• one of the wheels of the intermediate mobiles is mounted in friction with respect to its pinion.

The invention also relates to a clock movement comprising a time train and a mechanism for displaying the periods of an annual cycle according to the invention, the annual cycle train being directly meshed with the time train.

Preferably, the time train comprises an hour wheel making one revolution in twelve hours, the annual cycle train being directly meshed with the hour wheel or the time train comprises a 24-hour wheel making one revolution in twenty-four hours, the annual cycle train being directly meshed with the 24-hour wheel.

Preferably, the clock movement comprises a time train comprising an hour wheel or a 24-hour wheel, the gear train of the annual cycle train of the mechanism for displaying the periods of an annual cycle being meshed with said wheel of the hours and has a ratio of 1:2*365.2 or the gear train of the mechanism for displaying the periods of an annual cycle being meshed with said 24-hour wheel and has a ratio of 1:365.2.

Preferably, the hour wheel has 20 teeth and the indicator of the periods of an annual cycle is rotated by an annual cycle wheel having 100 teeth; the gear train of the annual cycle cog having the following ratios: 83/20*99/8*32/15*100/15.

Preferably, the 24-hour wheel has 20 teeth and the indicator of the periods of an annual cycle is rotated by an annual cycle wheel having 50 teeth; the gear train of the annual cycle cog having the following ratios: 83/20*99/8*32/15*50/15.

The invention also relates to a timepiece comprising a mechanism for displaying the periods of an annual cycle according to the invention, or comprising a clock movement according to the invention.

Advantageously, the timepiece is a wristwatch.

Brief description of the figures

• la figure 1 illustre une représentation schématique, en vue de dessus, d'un exemple de réalisation d'un mécanisme d'affichage des périodes d'un cycle annuel selon l'invention ;
• la figure 2 illustre un schéma de principe illustrant plus particulièrement le rouage du cycle annuel du mécanisme d'affichage des périodes d'un cycle annuel illustré à la figure 1 ;
• la figure 3 illustre schématiquement un exemple d'une pièce d'horlogerie comportant un mécanisme d'affichage des périodes d'un cycle annuel selon l'invention.

The aims, advantages and characteristics of the present invention will appear on reading the detailed description below referring to the following figures:

• there figure 1 illustrates a schematic representation, in top view, of an exemplary embodiment of a mechanism for displaying the periods of an annual cycle according to the invention;
• there figure 2 illustrates a block diagram illustrating more particularly the workings of the annual cycle of the mechanism for displaying the periods of an annual cycle illustrated in figure 1 ;
• there Figure 3 schematically illustrates an example of a timepiece comprising a mechanism for displaying the periods of an annual cycle according to the invention.

In all figures, common elements bear the same reference numbers unless otherwise specified.

Detailed description of the invention

The present invention consists of the general idea of simplifying the mechanisms for displaying the periods of an annual cycle in order to be able to implement them more easily in any type of clock movement, mechanical, electromechanical, or even electronic.

There figure 1 schematically illustrates an exemplary embodiment of a mechanism for displaying the periods of an annual cycle 100 according to the invention mounted in a plate 2 of a clock movement 1.

The mechanism for displaying the periods of an annual cycle 100 according to the invention is intended to be housed in a timepiece 200, for example in a case 210 of a wristwatch shown schematically at the Figure 3 .

The mechanism for displaying the periods of an annual cycle 100 according to the invention is driven by the clock movement 1, partially represented on the figures 1 to 2 .

Conventionally, the clock movement 1 comprises a time train 10 presenting in particular a timer mobile (not shown) driving an hour wheel 11, the entire time train 10 being configured so that the hour wheel 11 makes a complete revolution in 12 hours.

The hour wheel 11 conventionally carries an hour indicator 15, for example an hour hand.

The mechanism for displaying the periods of an annual cycle 100 includes an indicator of the periods of an annual cycle 110.

The indicator of the periods of an annual cycle 110 is rotated by an annual cycle wheel 112. Preferably, the indicator of the periods of an annual cycle 110 is integral with the annual cycle wheel 112.

The indicator of the periods of an annual cycle 110 is for example a needle secured to the shaft of the annual cycle wheel 112.

According to an alternative embodiment, the indicator of the periods of an annual cycle 110 can also be a disk secured to the annual cycle wheel 112.

Depending on the type of display desired, the disc can be visible in full by the user, or in part through an opening of suitable shape and provided in a dial of the timepiece 200.

The indicator of the periods of an annual cycle 110 is kinematically linked to the time train 10 via an annual cycle train 120.

More particularly, the annual cycle gear train 120 is directly meshed with the hour wheel 11 carrying the hour hand 15 on the one hand and with the annual cycle wheel 112 carrying the indicator of the periods of an annual cycle 110 d 'somewhere else.

Thus, the indicator of the periods of an annual cycle 110 is set in motion in a dragging manner by the time train 10.

The annual cycle train 120 forms a gear train having a ratio of 1:365.2 or a multiple ratio of 1:365.2 between the hour train 10 and the indicator of the periods of an annual cycle 110.

More particularly, the annual cycle train 120 forms a gear train having a ratio of 1:2*365.2 between the hour wheel 11 (making one revolution in 12 hours) and the annual cycle wheel 112.

The annual cycle gear train 120 is formed at most by three intermediate mobiles 121, 122, 123 positioned between the hour wheel 11 and the annual cycle wheel 112, thus constituting four meshes from the hour wheel 11 to the hour wheel 11. annual cycle 112. The annual cycle gear train 120 according to the invention has a reduced number of mobiles, which makes it possible to reduce the bulk of such a mechanism for displaying the periods of an annual cycle.

Preferably, the annual cycle cog 120 forms a gear train having the prime numbers 83, 2, 11 in the numerator and 5 in the denominator.

The annual cycle gear train 120 comprises a first intermediate mobile 121 meshed directly with the hour wheel 11, a second intermediate mobile 121 positioned between the first intermediate mobile 121 and a third intermediate mobile 123 meshed directly with the annual cycle wheel 112.

• la roue des heures 11 comporte 20 dents ;
• le premier mobile intermédiaire 121 comporte une roue de premier mobile intermédiaire présentant 83 dents et un pignon de premier mobile intermédiaire présentant 8 dents ;
• le deuxième mobile intermédiaire 122 comporte une roue de deuxième mobile intermédiaire présentant 99 dents et un pignon de deuxième mobile intermédiaire présentant 15 dents ;
• le troisième mobile intermédiaire 123 comporte une roue de troisième mobile intermédiaire présentant 32 dents et un pignon de troisième mobile intermédiaire présentant 15 dents ;
• la roue du cycle annuel 112 présente 100 dents.

In the exemplary embodiment illustrated in figures 1 And 2 :

• the hour wheel 11 has 20 teeth;
• the first intermediate mobile 121 comprises a first intermediate mobile wheel having 83 teeth and a first intermediate mobile pinion having 8 teeth;
• the second intermediate mobile 122 comprises a second intermediate mobile wheel having 99 teeth and a second intermediate mobile pinion having 15 teeth;
• the third intermediate mobile 123 comprises a third intermediate mobile wheel having 32 teeth and a third intermediate mobile pinion having 15 teeth;
• the wheel of the annual cycle 112 has 100 teeth.

Consequently, between the hour wheel 11 and the annual cycle wheel 112, the annual cycle gear 120 forms a gear train whose ratio is as follows: $$i=\frac{83}{20}\ast \frac{99}{8}\ast \frac{32}{15}\ast \frac{100}{15}=2\ast 365.2$$

Other combinations of meshing are possible by equivalence as long as the gear train has a ratio of 1: 365.2 or a multiple ratio of 1: 365.2 between the time train 10 and the period indicator d an annual cycle 110 and/or a gear train having the prime numbers 83, 2, 11 in the numerator and 5 in the denominator.

The mechanism for displaying the periods of an annual cycle 100 includes an adjustment mechanism which may be independent or common to the adjustment mechanism of the time train 10.

Preferably, the indicator of the periods of an annual cycle 110 is adjusted via a control rod 3 used to adjust the hands 15 of the time train 10 included in the clock movement 1.

In the case of a mechanical watch movement, the control rod 3 is combined with the winding rod ensuring the winding of the barrel spring as well as the setting of the time of the hands of the time train.

The control rod 3 can take different axial positions relative to the housing 210 and provide different control and/or adjustment functions.

One of the positions of the control rod 3 makes it possible to ensure the adjustment of the indicator of the periods of an annual cycle 110 by friction via an adjustment gear 7 driven by the rotation of the control rod 3, in cooperation with a sliding gear of the control rod 3.

Preferably, one of the wheels of the intermediate mobiles 121, 122, 123 of the annual cycle gear 120, or the annual cycle wheel 112, is mounted in friction on its shaft, so that it is possible to deindex the annual cycle wheel 112 of the time train 10, and thus modify the angular position of the indicator of the periods of an annual cycle 110 without modifying the angular position of the hands 15 of the time train 10. The principle of friction being widely known, it is not useful to describe it further.

Preferably, the adjustment gear 7 acts on one of the intermediate mobiles 121, 122, 123 of the annual cycle gear 120 so as to improve the precision during adjustment.

Preferably, the adjustment gear 7 acts on the third intermediate wheel 123, that is to say the intermediate wheel of the annual cycle gear 120 meshed directly with the annual cycle wheel 112.

Preferably, the wheel of the second intermediate mobile 122 is mounted in friction relative to its pinion.

Thus, the adjustment gear 7 is located between the sliding pinion (not shown) of the control rod 3 and the pinion of the third intermediate mobile 123.

The invention has been particularly described with the annual cycle gear train 120 meshed directly with the hour wheel making a complete rotation in twelve hours; however, the invention is of course applicable when the annual cycle train 120 is meshed with another wheel of the time train whose complete rotation is a multiple of the rotation of the hour wheel, such as for example a 24-hour wheel. Thus, the mechanism for displaying the periods of an annual cycle as described above must be adapted to take into account the ratio of 2.

For example, the annual cycle wheel 112 can have 50 teeth instead of 100 teeth if the annual cycle gear 120 is meshed with a 24-hour wheel, and keeping the same ratios as those presented previously. Thus, we obtain a ratio of 1:365.2 between a 24-hour wheel and the indicator of the periods of an annual cycle 110.

According to another exemplary embodiment, the annual cycle wheel 112 is a wheel having 50 teeth meshed with a 24-hour wheel having 10 teeth instead of 20 teeth as described previously. Thus, the reports are preserved.

Such a mechanism for displaying the periods of an annual cycle is perfectly suited to mechanical watch movements with or without a date, to electronic or electromechanical watch movements, due to the fact that the mechanism for displaying the periods of an annual cycle annual is dragging and does not generate peaks in energy consumption on hourly gear 10.

The mechanism for displaying the periods of an annual cycle according to the invention may also include ad hoc means making it possible to carry out a retrograde display of the periods of an annual cycle. Such means are conventionally used to move the indicator of the periods of an annual cycle in an arc (for example opposite a graduation inscribed on a dial) and to return it to the level of its starting position when it has completed the entire annual cycle.

The invention also relates to a clock movement 1 comprising a mechanism for displaying the periods of an annual cycle 100 according to the invention.

The invention also relates to a timepiece 200, such as a wristwatch, comprising a timepiece movement 1 according to the invention housed in a watch case 210.

Claims (16)

Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) capable of being driven in a dragging manner by a time train (10) of a watch movement (1) characterized in that the mechanism for displaying the periods of an annual cycle (100) comprises: - an indicator of the periods of an annual cycle (110); - an annual cycle train (120) capable of being driven by said time train (10) of the clock movement (1), and of rotating the indicator of the periods of an annual cycle (110); the mechanism for displaying the periods of an annual cycle (100) being characterized in that the annual cycle gear (120) forms a gear train configured to have a ratio of 1:365.2 or a multiple ratio of 1: 365.2 between the time train (10) and the indicator of the periods of an annual cycle (110). Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to the preceding claim, characterized in that the time train (10) comprises an hour wheel (11) making one revolution in 12 hours , and in that the gear train of the annual cycle train (120) is capable of being meshed with said hour wheel (11) of the time train (10), the gear train of the annual cycle train (120) ) being configured to have a ratio of 1:2*365.2 between the hour wheel (11) of the time train (10) and the indicator of the periods of an annual cycle (110). Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to claim 1, characterized in that the time train (10) comprises a 24-hour wheel making one revolution in 24 hours, and in that the gear train of the annual cycle train (120) is capable of being meshed with said 24-hour wheel of the time train (10), the gear train of the annual cycle train (120) being configured to have a ratio of 1:365.2 between the 24-hour wheel of the hour train (10) and the indicator of the periods of an annual cycle (110). Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to one of the preceding claims , characterized in that the ratio of the gear train of the annual cycle train (120) has the prime numbers 83, 2, 11 in the numerator and 5 in the denominator. Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to one of the preceding claims , characterized in that the annual cycle gear train (120) comprises a maximum of three intermediate mobiles (121, 122, 123). Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to one of the preceding claims , characterized in that the annual cycle gear train (120) comprises: - a first intermediate mobile (121) comprising a first intermediate mobile wheel having 83 teeth and a first intermediate mobile pinion having 8 teeth; - a second intermediate mobile (122) comprising a second intermediate mobile wheel having 99 teeth and a second intermediate mobile pinion having 15 teeth; - a third intermediate mobile (123) comprising a third intermediate mobile wheel having 32 teeth and a third intermediate mobile pinion having 15 teeth. Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to one of the preceding claims , characterized in that it comprises a friction adjustment mechanism for the indicator of the periods of an annual cycle (110). Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to claims 6 and 7 characterized in that one of the wheels of the intermediate mobiles (121,122, 123) is mounted in friction relative to at its pinion. Mechanism for displaying the periods of an annual cycle (100) for a timepiece (200) according to one of the preceding claims, characterized in that the mechanism is a mechanism for displaying the Chinese seasons. Clock movement (1) comprising a time train (10) and a mechanism for displaying the periods of an annual cycle (100) according to one of claims 1 to 9, the annual cycle train (120) being directly meshed with the time train (10). Clockwork movement (1) according to the preceding claim, characterized in that the time train (10) comprises an hour wheel (11) performing one revolution in twelve hours, the annual cycle train (120) being directly meshed with the hour wheel (11). Clock movement (1) according to the preceding claim, characterized in that the hour wheel (11) has 20 teeth and in that the indicator of the periods of an annual cycle (110) is rotated by a wheel of annual cycle (112) comprising 100 teeth; the gear train of the annual cycle train (120) having the following ratios: 83/20*99/8*32/15*100/15. Clock movement (1) according to claim 10, characterized in that the time train (10) comprises a 24-hour wheel performing one revolution in twenty-four hours, the annual cycle train (120) being directly meshed with the wheel of 24 hours. Clock movement (1) according to the preceding claim, characterized in that the 24-hour wheel has 20 teeth and in that the annual cycle wheel (112) has 50 teeth; the gear train of the annual cycle cog (120) presenting the following ratios: 83/20*99/8*32/15*50/15. Timepiece (200) comprising a mechanism for displaying the periods of an annual cycle (100) according to one of claims 1 to 9 or comprising a clockwork movement (200) according to one of claims 10 to 14. Timepiece (200) according to the preceding claim characterized in that said timepiece (200) is a wristwatch.

Images