CH717502B1 - Calendar system for a timepiece. - Google Patents

Abstract

The invention relates to a calendar system (1) for a timepiece comprising: a day disc (3) comprising indications representing the days over N weeks, where N is equal to five, six or seven, and defining 7N sectors , said day disc (3) being rotatable and able to occupy 7N stable positions; a tower of date indications (7) carrying thirty-one fixed indications distributed according to thirty-one consecutive sectors of said 7N sectors; an indication member (11), for example a hand, arranged to be driven in rotation in order to indicate the day of the week on said day disc (3) as well as the date on said date indication wheel ( 7) simultaneously. According to the invention, said system further comprises (1): an input mobile (15) arranged to be driven in rotation by a motive source; a date wheel set (13) comprising a date wheel (13a) arranged to be driven via said input wheel set (15) at the rate of at least one step per day and to drive said indicating member (11 ) in rotation. Said calendar wheel (13) is also arranged to be driven by said input wheel (15) at the rate of several additional steps at the end of each month at least in order to make a transition between an indication of the thirty-first first date and of the first date, said date mobile (13) being further arranged to drive said day disc (3) at the rate of several steps at the end of each month so that a correct indication of the day is aligned with the indication of the first date The invention also relates to a calendar system comprising an area, for example an aperture, to indicate the day of the week as well as the date.

Description

Technical area

The present invention relates to the field of watchmaking. It relates, more particularly, to a calendar system indicating both the date and the day of the week, by means of a single hand, window or the like.

State of the art

[0002] The document DE 20 2015 007 631 U reveals the principle of displaying dates and days of the week with a needle, the date and day indications being located on two concentric rings which surround the dial. Since a month can have up to 31 days and the weeks consist of 7 days, it is necessary to provide 35 equal sectors to distribute the indications of the days over five complete weeks. So that the hand can correctly indicate the date as well as the day of the week, one or the other of the rings is fixed, the other is mobile in rotation and is corrected at the end of each month. If the date ring is fixed, the hand must also be advanced by 5 to 8 steps in order to return to the “1” indication at the end of each month.

[0003] The document DE 20 2014 007 196 U describes another similar display, in which the two rings are mobile in rotation, the date and the day being displayed at 12 o'clock on the dial. Of course, at the end of each month, the angular position of the date ring must be corrected by several additional steps so that the number "1" is indicated correctly.

[0004] However, these documents do not reveal any mechanisms which make it possible to carry out the training necessary to ensure the operation of the display devices disclosed therein.

The object of the invention is therefore to provide a calendar system for a timepiece in which the aforementioned defects are at least partially overcome.

Disclosure of Invention

More specifically, the invention relates, in a first variant, to a calendar system for a timepiece, comprising:

[0007] - a disk of days, of circular or annular shape, comprising indications representing the days over N weeks, N being five, six or seven, and defining 7N sectors (that is to say 35, 42 or 49 sectors, according to the number N of weeks), said disk of days being mobile in rotation and able to occupy 7N stable positions which correspond, of course, to the 7N sectors and are therefore distributed regularly;

[0008] - a round of date indications bearing thirty-one fixed indications representing the dates, these indications being distributed according to thirty-one consecutive sectors of said 7N sectors and therefore being aligned with the day indications when the disc days is in one of its stable positions;

[0009] - an indicating member such as a hand, a disk bearing an index or the like, arranged to be driven directly or indirectly in rotation and to indicate the day of the week on said day disk as well as the date on said round of date indications simultaneously.

According to this variant of the invention, said system further comprises:

[0011] an input mobile arranged to be driven in rotation by a driving source, typically at the rate of one revolution per day;

[0012] - a date wheel set comprising a date wheel arranged to be driven via said input wheel set at the rate of at least one step per day and to directly or indirectly drive said indicating member in rotation, this the latter typically being integral in rotation with said mobile of the dates but which can be part of a mobile arranged to be driven by this latter mobile. The steps correspond, of course, to 1/7Nth of a turn.

[0013] The calendar wheel is also arranged to be driven by said input wheel at the rate of several additional steps at the end of each month at least in order to make a transition between an indication of the thirty-first calendar and an indication of the first date, said date mobile being further arranged to directly or indirectly drive said one day disc at the rate of several steps at the end of each month such that a correct indication of the day is aligned with the indication of the date „1“.

[0014] By these means, a display of the type described by document DE 20 2015 007 631 U can function as a simple, annual or (semi-)perpetual calendar, without requiring any manual correction of the day disc or the display organ at the end of each month. Of course, depending on the type of calendar, a manual correction will possibly be necessary at the end of the months having thirty days and/or at the end of at least some of the months of February.

[0015] Advantageously, said input wheel set comprises a drive finger arranged to drive said date wheel set at the rate of one step per day, as well as a first toothed sector arranged to cooperate with a second toothed sector that said mobile of the dates, the said toothed sectors being arranged to cooperate in such a way as to cause the said mobile of the dates to advance at the rate of 4+7 (N-5) additional steps (that is to say 4, 11 or 18 steps according to the number N of weeks) between an indication of the thirty-first date and an indication of the first date. The indicator can thus be advanced automatically to indicate „1“ after having indicated „31“.

[0016] In the case of an annual or (semi-)perpetual calendar, said date wheel set may further comprise a first additional retractable toothing arranged to cooperate with said first toothed sector so as to cause said date wheel set to advance at reason for at least one more step at the end of at least some of the months having less than thirty-one days. Therefore, an extra step at the end of months with 30 days, and possibly one or two more steps at the end of February, can be achieved.

[0017] Advantageously, said first additional retractable toothing is carried by an arm pivotally mounted on said mobile of the dates, the latter also carrying a cam arranged to move said first additional retractable toothing between at least one active position, in which it is capable to cooperate with said first toothed sector in order to cause said mobile of the dates to advance at the rate of said still at least one additional step, and an inactive position, in which said still at least one additional step will not take place. The number of active positions as well as the number of teeth, which comprises the first additional toothing, are to be determined according to the type of calendar (annual, semi-perpetual treating certain months of February correctly or perpetual).

[0018] Advantageously, said date wheel set comprises a third toothed sector arranged to advance a day wheel set which is in kinematic connection with said day disc by three steps or to move said day wheel set back by four steps. at the end of each month. The day disc is thus repositioned correctly and automatically at least at the end of the months having thirty-one days.

[0019] In the case where the third toothed sector is arranged to advance said mobile for days at the rate of three steps at the end of each month, said mobile for dates may also comprise a second additional retractable toothing arranged to advance said of the days at the rate of still at least one additional step at the end of at least certain months having less than 31 days (that is to say one, two or three additional steps, as the case may be), the number of pitch and the number of teeth that the second additional toothing comprises being determined according to the type of calendar, as mentioned above in the context of the first additional toothing.

[0020] Advantageously, said second additional toothing is carried by said arm and is therefore secured to said first additional toothing. Consequently, said second additional toothing is arranged to move between at least one active position, in which it is capable of cooperating with said day wheel in order to advance the latter at the rate of said still at least one additional step and an inactive position, wherein said at least one further step will not occur. Again, the number of active positions as well as the number of teeth are to be chosen according to the type of calendar.

[0021] Advantageously, said arm is arranged to be controlled by a control cam mounted in rotation on said calendar wheel set and arranged to perform one revolution in twelve months (for an annual or semi-perpetual calendar, with or without an additional cam for the month of February, if applicable) or in forty-eight months (for a perpetual calendar without an additional February cam) around its own axis of rotation. This cam therefore determines whether the retractable toothing(s) is (are) in an active or inactive position.

The invention also relates, in a second variant, to a calendar system for a timepiece, comprising:

[0023] - a disk of days comprising indications representing the days over N weeks, N being five, six or seven, and defining 7N sectors (that is to say 35, 42 or 49 sectors, according to the number N of weeks), said day disk being rotatable and able to occupy 7N stable positions corresponding to said sectors;

[0024] a date disc which is rotatable and which carries thirty-one date indications distributed over thirty-one consecutive sectors of said 7Nsectors;

[0025] a zone arranged to indicate the day of the week as well as the date on said day disc and said date disc, this zone being for example defined by an aperture, an index or the like.

According to this variant of the invention, said system further comprises:

[0027] - an input mobile arranged to be driven in rotation by a driving source and to directly or indirectly drive said day disc at the rate of one step per day, a step corresponding of course to 1/7N-th d 'a lap ;

[0028] - a date wheel comprising a date wheel arranged to drive said date disc in rotation and having at least thirty-one stable positions, said date wheel being arranged to be driven by means of said wheel set entry at least one step per day.

[0029] The date wheel set is also arranged to be driven by said input wheel set at the rate of at least several additional steps in order to make a transition between an indication of the thirty-first date and an indication of the first date.

[0030] By these means, a display of the type described by the document DE 20 2014 007 196 U can function as a simple, annual or (semi-) perpetual calendar, without requiring any manual correction of the day disk or the date disk. calendars at the end of each month. Of course, depending on the type of calendar, a manual correction will possibly be necessary at the end of the months having thirty days and/or at the end of at least some of the months of February.

[0031] Advantageously, said input wheel set comprises a drive finger arranged to drive said date wheel set at the rate of one step per day, as well as a first toothed sector arranged to cooperate with a second toothed sector that said mobile of the dates, said toothed sectors being arranged to cooperate in such a way as to cause the said mobile of the dates to advance at the rate of 4+7(N-5) additional steps between an indication of the thirty-first calendar and an indication of the first calendar (ie 4, 11 or 18 steps depending on the number Nof weeks), so that the date disc is repositioned correctly at least at the end of months with 31 days.

[0032] In the case of an annual or (semi-)perpetual calendar, said date wheel set may further comprise a first additional retractable toothing arranged to cooperate with said first toothed sector so as to cause said date wheel set to advance at reason for at least one more step at the end of at least some of the months having less than thirty-one days. Therefore, an extra step at the end of months with 30 days, and possibly one or two more steps at the end of February months can be obtained.

[0033] Advantageously, a day wheel is in kinematic connection with said day disc, and is arranged to be driven at the rate of one step per day by means of an additional drive finger carried by said wheel. entrance.

Brief description of the drawings

Other details of the invention will appear more clearly on reading the following description, given with reference to the appended drawings in which: Figure 1 is a plan view of a calendar system according to a first embodiment of the invention; Figures 2a to 2c are partial plan views illustrating the training phases of the system at the end of a month having 31 days; FIG. 3 is a partial plan view illustrating the drive at the end of a month of February having 29 days, for a variant with a perpetual calendar; FIGS. 4a and 4b illustrate the elements of the calendar wheel of a variant with an annual calendar, the retractable teeth being in two different relative angular positions; FIG. 4c is a partial side view illustrating the cooperation between the date wheel set and the entry wheel set at the end of a month, as well as the arrangement of the control cam in the height of the system; Figures 5a to 5c illustrate the phases of the training of the monthly mobile; FIG. 6 represents the interaction between the entry wheel set and the date wheel set during a correction in the opposite direction; FIG. 7 represents the interaction between the date wheel and a month indication wheel; And Figure 8 shows a plan view of another embodiment of a calendar system according to the invention.

Embodiments of the Invention

[0035] Figures 1 to 7 illustrate an embodiment of a calendar system 1 according to a first variant of the invention.

This system 1 comprises a day disc 3 of annular shape which is rotatably mounted around a central axis 5, and which carries a series of indications of the day of the week over 5 weeks. These indications are evenly distributed around the disc of days 3, and thus define thirty-five equal sectors. This disc 3 is arranged to be able to occupy thirty-five stable angular positions corresponding to thirty-five equal sectors, by means of ad hoc positioning means (not shown), and comprises internal toothing (also not shown) in order to allow its rotation training. In variants not shown, the number of weeks indicated can be 6 or 7, giving rise to 42 respectively 49 sectors. More generally, the number of weeks indicated is an integer N, N being equal to 5, 6 or 7, the number of sectors therefore being 7N.

[0037] Inside the day indications is a day indication tower 7, which is concentric with said day disc 3 and whose indications occupy thirty-one of the thirty-five sectors (more generically 7N sectors) so that each indication of a date is angularly aligned with an indication of a day when the day disc 3 is in one of its stable positions. In the arrangement illustrated, the circle of date indications 7 is fixed, and is arranged symmetrically with respect to the 12 o'clock-6 o'clock axis of the system, but this is not compulsory. Alternatively, said lap 7 may be outside the day indications. Furthermore, a cover 9 can be provided to hide the four day indications which are not aligned with the date indications, or else a mobile cover could be provided to display only part of the dates, for example those of a week, but these are also not compulsory. The day and date indications can be located on two different levels, or on the same level considered parallel to the plane of system 1.

In order to indicate the date and the day of the week simultaneously, a display member 11, here illustrated in the form of a needle, is also pivotally mounted around the axis 5, and is arranged to be able to occupy at least thirty-one stable angular positions, which correspond to the angular positions of the date indications. In the following, the term "needle" will be used in order to lighten the reading, but the display member 11 can also take the form of a line, an index or the like provided on a rotating disc of any shape. .

[0039] The heart of the invention resides in the mechanism which makes it possible to move the needle 11 and the disc of the days 3 in rotation at the end of each month.

[0040] The variant illustrated in Figures 1 and 2a-c takes the form of an annual calendar, in which manual correction is necessary exclusively at the end of February, but can also be a simple calendar requiring manual correction at the end of each month having less than 31 days, or alternatively can be a perpetual calendar, which can make the transition to the end of each month correctly and without manual intervention.

The hand 11 is mounted integral in rotation with a date wheel set 13 which comprises a date wheel 13a having 35 teeth (triangular in the variant illustrated but which can take another ad-hoc form) arranged to be driven in rotation once a day by means of a drive finger 15a carried by an input mobile 15. The latter comprises a toothed wheel 15b arranged to be driven in rotation at the rate of one revolution per day under the effect of a basic mechanical or electrical movement, and on which said finger 15a is superimposed. The elements for indicating the current time of the basic movement have not been represented here, and can be of any known type. In the case where N is 6 or 7, the number of teeth of the date wheel 13a can be 42 or 49, respectively. It is also noted that it is not obligatory that the hand 11 be integral in rotation with the mobile of the dates 13, it can alternatively be fixed to another mobile driven by the latter.

[0042] With each rotation of said toothed wheel 15b, the finger drives the date wheel 13 around midnight at the rate of one pitch of its teeth, said wheel 13 being positioned in each of thirty-five stable angular positions (more generically 7N stable angular positions) through ad hoc means such as a jumper (not shown) in a known manner.

[0043] Consequently, when the needle 11 is supposed to make only one step of 1/35 <th> of a turn (more generically 1/7N-th of a turn), it is the finger 15a which drives it, in a conventional manner. In order to lighten the reading thereafter, the generic case will be mentioned exclusively when it implies a substantial difference compared to the variant illustrated, in which N=5. The modifications to be made to the illustrated embodiment to obtain a variant according to which N=6 or N=7 are within the abilities of those skilled in the art.

By cons, at the end of the month, the needle 11 must be driven at a rate of at least five steps in total.

To ensure this training, the input mobile 15 also includes a first toothed sector 15c which is integral in rotation with the toothed wheel 15b and superimposed on the latter. The first toothed sector 15c cooperates with a second toothed sector 13b integral in rotation with the date wheel 13a and also superimposed on the latter.

The relative position of the various components of the system 1 illustrated in Figure 1, corresponds to the state of the system 1 on the 31st of the month, just before the finger 15a cooperates with the date wheel at the end of the 31st >of the month. The entry mobile 15 pivoting in the counterclockwise direction (according to the orientation of the figures), the date wheel 13a is then driven at a rate of 1/35 <th> of a turn under the effect of the finger 15a.

[0047] Figure 2a illustrates the positions of the elements concerned just after this first training. In this state, the first toothed sector 15c is now in engagement with the second toothed sector 13b, such that the date mobile 13 is then driven at the rate of four additional steps, as illustrated in FIGS. 2b and 2c, by the cooperation between these two toothed sectors 15c, 13b.

[0048] Figure 2c illustrates the situation at the end of the drive of the mobile of the dates 13, the hand 11 now moving towards the indication "1" of the date, and the second toothed sector 13b being out of engagement of the first toothed sector 15c.

In the construction illustrated, the second toothed sector 13b comprises three fixed teeth on a pitch circle with a radius smaller than that of the date wheel 13a, the first toothed sector 15c comprises six, but the numbers of teeth as well as their pitch radii can be chosen on an ad hoc basis in order to ensure that the cooperation between the three fixed teeth and the first toothed sector 15c performs four additional pitches of the toothing of the date wheel 13a, that is to say 4/ 35th of a lap. If N=6, the number of steps to take is 11/42<th>of a turn, and if N=7, the number of steps is 18/49<th>of a turn . More generically, the number of steps is expressed as 4+7(N-5) steps of 1/7N-th of a turn each.

[0050] As explained above, at the end of the month, the day disc 3 is advanced by at least four steps so that the correct day is displayed in line with the number "1" of the date.

In order to ensure this rotation, the date mobile 13 also includes a third toothed sector 13c, which is integral in rotation with the second toothed sector 13b. In fact, in the illustrated construction, these two toothed sectors 13b, 13c are in one piece, but can also comprise two separate parts each integral with the date wheel 13a.

The third toothed sector 13c comprises four teeth, and meshes with a star wheel with thirty-five teeth 17a (more generically 7N teeth) that comprises a mobile of the days 17. The latter also comprises a toothed wheel 17b which is integral in rotation of said star 17a, and which drives the day disc 3 via a transmission 19 which meshes with the toothing of said day disc 3. Alternatively, the day disc 3 can be driven directly from the day mobile 17, or a higher number of referrals may be provided.

In order to ensure the positioning of the disc of the days 3, a jumper or the like can cooperate with the star with thirty-five teeth 17a in a known manner.

[0054] Consequently, during the training sequence illustrated by FIGS. 1, 2a, 2b and 2c, the mobile of the days 17 is driven at the rate of 4/35 <th> of a turn, and the disk of the days days 3 also moves angularly at the rate of 4/35th of a turn clockwise according to the orientation of FIGS. 1 to 2c. Alternatively, the third toothed sector 13c may comprise three teeth, the toothed wheel 17b meshing directly with the day disc 3 or via two transmissions 19, in order to drive the day disc 3 at the rate of three steps (3 /35<th>of a turn) counterclockwise. The same number of steps also apply in the case where N=6 or N=7, the steps being of course in 42<ths> respectively 49<ths> of a turn.

[0055] By these means, when the hand 11 indicates the number "1", the correct day is displayed in line with the latter.

The mechanism as described up to now is sufficient for a simple calendar, requiring manual correction at the end of each month having less than 31 days. In order to be able to carry out an automatic correction at the end of at least some of these months, the calendar wheel 13 has a first retractable additional toothing 13d, as well as a second retractable additional toothing 13n, integral in rotation with one of the other, and visible in Figures 3, 4a and 4b. These retractable toothings 13d, 13n are carried by an arm 13f which is pivotally mounted around the axis 5 so that the retractable toothings 13d, 13n can occupy at least two relative angular positions with respect to the second toothed sector 13b. In the first relative angular position (see Figure 4a), the first retractable toothing 13d is overlapped by the second toothed sector 13b, and the second retractable toothing 13n is overlapped by the third toothed sector 13c, as also visible in Figures 1 to 2c, which clearly illustrate that the teeth of the retractable toothings 13b, 13n are aligned with and therefore each overlapped by a respective tooth of the corresponding toothed sector 13b, 13c. The retractable teeth 13d, 13n are therefore inactive.

In the second relative angular position, the retractable teeth 13d, 13n extend from the respective toothed sectors 13b, 13c in the upstream direction at the rate of one pitch of the corresponding teeth of the latter (see FIG. 4b). Consequently, the first retractable toothing 13d provides an additional tooth which cooperates with the first toothed sector 15c at the end of the 30th day of the month for a total of six rotation steps of the date mobile 13, and the second retractable toothing 13n provides an additional tooth to cooperate with the 17a star for a total of four pitches of the 17-day rover.

[0058] Figure 3 illustrates the situation in which the retractable teeth 13d, 13n are in a third relative angular position, which applies exclusively in the case of a (semi-) perpetual calendar arranged to perform a correction to the end of the months of February having 29 days, and in which each additional toothing 13d, 13n provides two additional teeth, for driving the mobile of the dates 13 at the rate of two additional steps at the end of the month of February. It is also possible to provide a fourth relative angular position, in which case each additional toothing 13d, 13n provides three additional teeth in order to carry out an automatic correction at the rate of three additional steps at the end of the months of February of non-leap years.

Generally considered, the minimum number of teeth of the retractable toothings 13d, 13n is to be chosen according to the desired automatic corrections: as illustrated in FIG. 3, these retractable toothings 13d, 13n each comprise two teeth, which implies a manual correction at the end of February in non-leap years. At least three teeth also allow for automatic correction at the end of the last few months. On the other hand, a minimum of a single tooth is necessary if a manual correction at the end of each month of February (conventional annual calendar) is desired in order to simplify the mechanism, and is illustrated below.

[0060] Consequently, at the end of the last day of a month having less than 31 days which can be processed correctly by the system 1, the finger 15a drives the mobile of the dates 13 at the rate of one step, as described above. above, then the active teeth of the retractable toothing 13d as well as the three teeth of the second toothed sector 13b are driven by the first toothed sector 15c in order to advance the mobile of the dates 13 at the rate of five, six or seven additional steps of 1/35 <th> of a turn (more generically 1/7N-th of a turn), depending on the number of teeth of the first retractable toothing 13d which are active (that is to say which are protruding from the toothed sector 13b), so that the needle 11 indicates „1“ again. At the same time, the star 17a is also driven at the rate of one, two or three additional steps by means of the active tooth, or active teeth, of the second retractable toothing 13n, in order to correct the indication of the day due to the correct number of steps for the month in question.

The angular position of the retractable teeth 13d, 13n is controlled by a control cam 13g which is pivoted on the date wheel 13a on the opposite side of the latter than that occupied by the second toothed sector 13b, as appears more clearly in FIGS. 4a to 4c, this cam having been omitted in FIG. 3. FIGS. 4a to 4c illustrate an embodiment of an annual calendar, requiring correction at the end of each month of February. As a result. The retractable teeth 13d, 13n have only two relative angular positions in these figures.

In the illustrated embodiment, the control cam 13g takes the form of a cam path carried by a mobile month 13h and in which takes place a cam follower 13j, which passes through an opening 13k made in the date wheel 13a. Alternatively, the control cam 13g can be of conventional shape, a return spring serving to maintain the cam follower 13j in contact with the periphery of such a cam in a known manner.

[0063] When the cam follower 13j is located in a section of the cam path with a lower radius (as illustrated in FIG. 4a), the retractable teeth 13d, 13n are each located below, and aligned with, the teeth of the sector toothed 13b, 13c corresponding and are therefore in the first relative angular position (inactive). Hand 11 will therefore indicate the 31st of the month, when the time comes.

[0064] On the other hand, when the cam follower 13j is located in a section of the cam path with an upper radius (as illustrated in FIG. 4b), the retractable teeth 13d, 13n are in an active angular position at the end of the last day of the month, as described above, and the extra step training will take place at the end of the 30th of the month. In the case where the retractable teeth 13d, 13n can have several active angular positions, that is to say in the case of a (semi-)perpetual calendar, the shape of the control cam 13g will have tracks with several different radii, in order to control the retractable teeth 13d, 13n to adopt their third and possibly fourth angular positions in order to generate one or two additional steps.

Alternatively, different shapes of control cams 13g can be used, in particular in the case of a perpetual calendar, for example a cam having 48 angular positions, each position of which corresponds to a month out of a series of 48 months, or a cam having 12 annular positions carrying an additional cam for the month of February with four positions, in a conventional manner.

[0066] In order to index the control cam 13g, the month wheel set 13h comprises a toothing with 12 pointed teeth which cooperates with a fixed element 21, coaxial with the date wheel set 13. This cooperation is self-locking and self-indexing, and is used to drive the 1pm month wheel one step per month around its own axis of rotation. The fixed element 21 is integral in rotation with a frame element (not shown) and is therefore not driven in rotation.

The fixed element 21 comprises, over the greater part of its periphery, a section with a substantially constant radius 21a delimited by the dashed lines in FIG. 5a and occupying the obtuse angle between these lines. This surface cooperates with the tops of two adjacent teeth of the month wheel set 13 o'clock and prevents the latter from pivoting about its own axis when the two tops of the teeth are each located on this section.

The other section of the periphery of this element 21 (that is to say that occupying the acute angle between the dashed lines) has two teeth 21b, 21c, separated by a notch 21d. These elements are angularly positioned in order to carry out the training of the monthly mobile 13h well before the end of the month, in order to ensure that the retractable tooth 13d is in its active angular position, if necessary, before the end of the 30 <th> of the month and at the end of February, if applicable.

[0069] The teeth 21b, 21c each have a length as well as sufficient clearance with respect to the teeth of the mobile month 13h to perform the following operation.

[0070] During the rotation of the mobile of the months 13, the tooth 21b allows the passage of an upstream tooth of the mobile of the months 13h. When the next tooth, swallow, of the mobile of the months 13h cooperates with the tooth 21b, the latter causes the mobile of the months 13h to pivot slightly, so that the aforementioned upstream tooth enters the notch 21d (see FIGS. 5a and 5b) . Then, the upstream tooth of the month wheel 13g comes into contact with the other tooth 21c of the fixed element 21 (see FIG. 5b), which causes the month wheel 13g to pivot so that it adopts its next angular position. stable with respect to its own axis of rotation. At the same time, the cam follower 13j travels along the control cam 13g, which causes the retractable tooth 13d to change, if necessary, from one of its angular positions to the other.

[0071] This arrangement functions similarly to a Maltese cross mechanism, which may alternatively be used in the same manner here.

In order to allow the system to operate in the opposite direction when the user performs a correction of the current time display members in the opposite direction, the input mobile 15 also comprises a first additional toothed sector 15d, which is arranged in such a way as to interact with the second toothed sector after the driving of the date wheel 13a by the finger 15a, in a manner analogous to the driving in the normal direction as described above, mutatis mutandis, as further illustrated especially Figure 6.

As shown in Figure 7, it is also possible to provide a mobile indication of the months 23, which carries a disc or a needle indicating the current month. This mobile has a star toothing 23a which is arranged to be driven at the rate of one step at the end of each month by means of an additional finger 13m carried by the date mobile 13. The month mobile 23 can for example be positioned by a jumper in a known manner.

It should also be noted that the day disk 3 can alternatively take a different shape, such as a circular disk pivoted at its center or the like.

[0075] Figure 8 illustrates, schematically, a second embodiment of a calendar system 1 according to the invention, which will be described mainly with reference to the differences with respect to those of Figures 1 to 7.

In this variant, the date indication tower 7 is provided on a rotating date disc 7a, which is coaxial with the day disc 3 and is provided with ad hoc drive teeth (not shown). Each of said discs 3, 7a is annular in shape, the day and the date being displayed at 12 o'clock in a zone defined by an aperture 27 or by reference to another appropriate index. Again, the day disc 3 may comprise indications of the days over five, six or seven weeks, N therefore being 5, 6 or 7, in particular 5 in the variant illustrated.

In this construction, the input mobile 15 is pivotally mounted around the axis 5, and carries a drive finger 15a as well as first toothed sectors 15c, 15d. These elements 15a, 15c, 15d interact with an off-center date wheel 13, in the same way as described above. The date wheel 13a cooperates directly or indirectly with the date disc 7a in order to drive it in a similar way to the hand 11, and thus to ensure that the correct number appears in the window 27 at the beginning of the next month, at the beginning of the next month. less at the end of months with 31 days. If an automatic correction is desired for the other months, or for the months having 30 days, a retractable toothing as well as its control system can be provided on the mobile of the dates 13 in a manner similar to those of the first embodiment.

The entry wheel set 15 also includes an additional drive finger 15f, which is arranged to drive the star wheel 17a of the day wheel set 17, so that it cannot interact with the date wheel set 13 The 17-day mobile cooperates directly or indirectly with the 3-day disc in order to drive the latter at the rate of 1/35<th>of a revolution per day (more generically 1/7N-th of a revolution per day). Since the 3-day disc does not need correction by several additional steps at the end of each month, no additional measures are necessary for the training of star 17a.

In each of the embodiments described above, the entry wheel set 15, the date wheel set 13 and the day wheel set 17 are arranged linearly, such that their respective axes of rotation lie on a same line. However, this is not obligatory, and the three mobiles 13, 15, 17 can be arranged differently, for example in “V”. For the rest, it is not obligatory that the axis 5 is at the center of the system 1, particularly with regard to the embodiment of figure 8.

[0080] For the rest, even if the system 1, according to the invention, can be arranged coaxially to the movement of the timepiece in which it is integrated, this is not mandatory either, and the system 1 can be offset from the latter.

[0081] Finally, it is noted that the gear ratios, shapes of the teeth, etc., can be adapted according to the needs of the manufacturer, and should not repeat those described above and illustrated in the figures.

[0082] Although the invention has been previously described in connection with specific embodiments, other additional variants are also possible without departing from the scope of the invention as defined by the claims.

Claims (14)

1. Calendar system (1) for a timepiece, comprising: – a day disc (3) comprising indications representing the days over N weeks, where N is equal to five, six or seven, and defining 7N sectors, said day disc (3) being mobile in rotation and able to occupy 7N positions stable; – a tower of date indications (7) carrying thirty-one fixed indications distributed according to thirty-one consecutive sectors of said 7N sectors; – an indication member (11) arranged to be driven in rotation in order to indicate the day of the week on said day disc (3) as well as the date on said date indication tower (7) simultaneously , characterized in that said system further comprises (1): – an input mobile (15) arranged to be driven in rotation by a driving source; – a date wheel set (13) comprising a date wheel (13a) arranged to be driven via said input wheel set (15) at the rate of at least one step per day and to drive said indicating member ( 11) in rotation, and in that said calendar wheel (13) is also arranged to be driven by said input wheel (15) at the rate of several additional steps at the end of each month at least in order to perform a transition between an indication of the thirty-first date and an indication of the first date, said date mobile (13) being further arranged to drive said day disc (3) at the rate of several steps at the end of each month of such that a correct indication of the day is aligned with the indication of the first date. 2. Calendar system (1) according to the preceding claim, wherein said input wheel set (15) comprises a drive finger (15a) arranged to drive said date wheel set (13) at the rate of one step per day. , as well as a first toothed sector (15c) arranged to cooperate with a second toothed sector (13b) that comprises said date mobile (13), said toothed sectors (15c, 13b) being arranged to cooperate in such a way as to advance said date mobile (13) at the rate of 4+7(N-5) additional steps between an indication of the thirty-first date and an indication of the first date. 3. Calendar system (1) according to the preceding claim, wherein said mobile calendar (13) further comprises a first additional retractable toothing (13d) arranged to cooperate with said first toothed sector (15c) so as to advance said date mobile (13) at the rate of at least one additional step at the end of at least some of the months having less than thirty-one days. 4. Calendar system (1) according to the preceding claim, in which said first additional retractable toothing (13d) is carried by an arm (13f) pivotally mounted on said date wheel set (13), the latter also carrying a cam (13g ) arranged to move said first additional retractable toothing (13d) between at least one active position, in which it is capable of cooperating with said first toothed sector (15c) in order to advance said mobile of the dates (13) at the rate of said still at least one additional step, and an inactive position, in which said at least one further step will not take place. 5. Calendar system (1) according to one of claims 2 to 4, in which said calendar wheel (13) comprises a third toothed sector (13c) arranged to advance a day wheel (17) which is connected kinematics with said disc of days (3), at the rate of three steps or to roll back said mobile of the days (17) at the rate of four steps at the end of each month. 6. Calendar system (1) according to the preceding claim, in which said third toothed sector (13c) is arranged to advance said mobile of the days (17) at the rate of three steps at the end of each month, said mobile of the dates (13) further comprising a second additional retractable toothing (13n) arranged to advance said mobile of the days (17) at the rate of still at least one additional step at the end of at least certain months having less than 31 days. 7. Calendar system (1) according to claims 6 and 4, wherein said second retractable additional toothing (13n) is carried by said arm (13f) and is arranged to move between at least one active position, in which it is capable to cooperate with said day wheel (17) in order to advance the latter (17) at the rate of said still at least one additional step, and an inactive position, in which said still at least one additional step will not take place. 8. Calendar system (1) according to Claim 4 or according to Claim 4 and one of Claims 5 to 7, in which the said arm (13f) is arranged to be controlled by a control cam (13g) mounted in rotation. on said mobile of the dates (13) and arranged to complete one revolution in twelve months or in forty-eight months around its own axis of rotation. 9. Calendar system (1) for a timepiece, comprising: – a day disc (3) comprising indications representing the days over N weeks, N being five, six or seven, and defining 7N sectors, said day disc (3) being rotatable and able to occupy 7N stable positions; – a date disc (7a) which is rotatable and which carries thirty-one date indications distributed over thirty-one consecutive sectors of said 7N sectors; – a zone (27) arranged to indicate the day of the week as well as the date on said day disc and said date disc, characterized in that said system further comprises: – an input mobile (15) arranged to be driven in rotation by a power source and to drive said day disc (3) at the rate of one step per day; – a date mobile (13) comprising a date wheel (13a) arranged to drive said date disc (7a) in rotation and having at least thirty-one stable positions, said date wheel (7a) being arranged to be trained through said entry mobile (15) at the rate of at least one step per day, and in that said date wheel set (13) is also arranged to be driven by said input wheel set (15) at the rate of several additional steps at least in order to effect a transition between an indication of the thirty-first date and an indication of the first date. 10. Calendar system (1) according to the preceding claim, wherein said input wheel set (15) comprises a drive finger (15a) arranged to drive said date wheel set (13) at the rate of one step per day. , as well as a first toothed sector (15c) arranged to cooperate with a second toothed sector (13b) that comprises said date mobile (13), said toothed sectors (15c, 13b) being arranged to cooperate in such a way as to advance said date mobile (13) at the rate of four additional steps between an indication of the thirty-first date and an indication of the first date. 11. Calendar system (1) according to the preceding claim, in which said calendar wheel set (13) further comprises a first additional retractable toothing arranged to cooperate with said first toothed sector (15c) so as to cause said wheel set to advance. calendars (13) at the rate of still at least one additional step at the end of at least some of the months having less than thirty-one days. 12. Calendar system (1) according to the preceding claim, in which a mobile of the days (17) in kinematic connection with the said disc of the days is arranged to be driven at the rate of one step per day by means of a finger additional drive (15f) carried by said input mobile (15). 13. Clock movement comprising a calendar system (1) according to one of claims 1 to 12. 14. Timepiece comprising a timepiece movement according to claim 13.