EP2410389B1 - Bi-directional date correction mechanism for a date mechanism. Date mechanism. Time piece. - Google Patents

Description

The invention relates to a bidirectional date corrector mechanism controlled by an operating puller pivotally mounted about a pivot axis, for a date mechanism of a timepiece, said date mechanism comprising a twenty-four wheel. hours driven by the movement of said timepiece, a date update finger mounted integral pivotably of said twenty-four hour wheel around a pivot axis, and a date drive star, said correction mechanism comprising a correction star movable pivotally about a pivot axis and located between said finger and said date drive star.

The invention also relates to a date mechanism comprising a date drive star and a twenty-four hour wheel comprising a date update finger, and equipped with such a date correction mechanism.

The invention also relates to a timepiece comprising a date mechanism comprising a date drive star and a twenty-four hour wheel including a date update finger, and equipped with such a correction mechanism. dated.

Background of the invention

The invention relates to the field of watchmaking, and more particularly that of timepieces comprising date display mechanisms.

Date mechanisms are complex mechanisms.

The manual correction of the date is necessary, for the months of less than thirty-one days, in the case of the single date timepieces. This correction is generally performed, either by rotating the winding stem in a fast update position, or by actuating a dedicated pusher for this purpose.

Updating the date is not always easy, especially when the user wants to change the date near midnight.

In addition, most of the known mechanisms do not allow the date to be changed backwards.

A patent US 212 882 in the name of Baillot, exposes, as early as 1879 , a date corrector mechanism with a pawl cooperating, under the action of a pusher, with the toothing of a 31-day wheel to advance it.

We know, by the patent EP 1 115 041 in the name of Chopard Manufacture SA, a mechanism for manual rapid correction of the date for a movement comprising a winding stem with three axial positions having a sliding pinion and a date star. This mechanism comprises a tilting corrective lever having at one of its ends a beak cooperating with the toothing of the date star, and at the other end thereof a finger biased by a spring against a cam having at least one lift. This cam is carried by a corrective wheel driven by a kinematic connection by the sliding pinion, when the winding stem is in an intermediate axial date correction position. The lifts of the cam are pointed, so when the winding stem is out of the calendar adjustment position, the spring of return of the finger on the cam causes the return of this finger between two lifts of the cam, so that that the beak of the lever is no longer in contact with the date star. This mechanism allows the progress of the date by a rotation of any direction of the winding stem, but it does not allow the decline of the date.

A patent EP 1 660 952 on behalf of Vaucher Manufacture Fleurier SA discloses a manual date corrector for single date and an automatic date corrector for perpetual calendar. This corrector comprises means for programming the correction of the display of the date according to the number of days of the current month introduced by the user or by an automatic mechanism, and means for restitution of this correction on the last day. real of the month considered. These programming means comprise a clutch movable consisting of two coaxial toothed discs drive in opposite directions, one by the thirty-one wheel, and the other by the control means which establish the number of days of the month, so that at the end of the current month the display means are automatically corrected. These two discs are coupled by a spring and a pawl system allowing independent rotation of a disc relative to the other. They still allow the second disk that is driven by the control means, on the one hand drives the other disk when it rotates in the first direction, and on the other hand does not cause this other disk when it turns in. the other direction and then just load the spring. In addition to these disks, the programming means comprise a finger fixed on the wheel of thirty-one, a rocker pivoting on the second disk and actuated by the finger on the last day of the current month, and then actuating another rocker independent of the mobile clutch. This other rocker immobilizes the second disk and releases it when it is actuated, so that, under the action of the spring, the first disk progresses rapidly to correct the date display. This complex device ensures correction in both manual and automatic, but it also does not allow to move back the date instead of moving it forward.

Similarly, the patent application is known EP 1,538,494 in the name of Watch-U-License AG describing a quick date setting device, having a pull-rod pulled by the winding stem and rotating a rocker-arm loader which, in an intermediate position of the winding stem, winding, meshes with a wheel coupled to a calendar corrector mobile equipped with fingers capable of acting on a date indicator crown. This device requires an intermediate gear, and is one-way.

The patent EP 0 230 878 on behalf of Complications SA offers a date corrector with a rod driving, via a train, a correction star meshing directly with a date star. This simple system is however not permanently usable because the date star is, in the vicinity of midnight, in cooperation with an elastic finger of the wheel of twenty-four hours, and any manual intervention is then detrimental to the movement. Moreover, this mechanism only makes it possible to advance the date, and not to move it back.

A more complex calendar correction mechanism for perpetual calendar is presented by the patent EP 1488 290 on behalf of Manufacture Roger Dubuis SA, which is indexed to the position of an annual cam, detected by a probe, and intended for automatic operation, but not for manual correction.

However, these known mechanisms all use the kinematic chain winding and sliding pinion, and the maneuver update date is day by day, is quite tedious, and causes wear of the winding mechanism and setting to the hour. And especially, although some allow the rotation of the winding stem in both directions to advance the date, they only allow the update in one direction of increase of the date, with of course a passage of 31 to 1, to return to a lower date than the one previously displayed.

The patent EP 1,953,611 in the name of Longines Watch Company, Francillon SA, describes a bidirectional correction mechanism of a display device such as a date mechanism. This mechanism provides a reliable and effective solution to the problem of correction of the date in the direction of recoil. Two rakes tend, contrary to, to act on the display wheel of the date. The first rake is controlled by a first rocker which cooperates with a cam-limaçon integral with a date wheel, itself driven each day by a finger integral with the wheel of twenty-four hours. The second rake is controlled by a second rocker, which cooperates with a peripheral cam driven by the winding stem, and the peripheral cam is arranged to separate the first rocker cam-limaçon. Thus the date wheel can rotate in both directions. This improved mechanism however has many components, which make the cost quite high, and its size, especially at the peripheral cam, makes it difficult to adapt to all movements.

There is still a patent application EP 0 871 093 A1 in the name of ORIS, which describes a manual corrector of date indicator toothed ring. A first or a second device can be coupled to the date indicator, one at a time by means of decoupling means, the first for the only correction of the date indicator, and the second for the correction of the date hands. hour and minute and the date indicator. The second device is a mobile having a first star that can mesh with the toothed ring, and a second star that can mesh with a finger carried by an intermediate wheel. The latter meshes with the wheel of the hours. The decoupling means are a plate supporting the mobile and biased by the spring, pivoting on a carrier axis of the intermediate wheel. The mobile is engaged when the first star meshes with the ring. The mobile is disengaged when the first device is actuated, the first star no longer meshes with the ring, whose teeth push those of the first star out of their path against the return force of the spring. The engagement and disengagement positions are defined by the relative position of a pin fixed to the plate relative to an oblong of the plate, which is in particular body with the spring. This mechanism corresponds to the preamble of the claim of the present application.

Summary of the invention

The invention according to the appended claims proposes to provide a solution to the problem of a date correction at any time, and in both directions, with a number of components as small as possible, and a small footprint.

To this end, the invention relates to a bidirectional date corrector mechanism controlled by a maneuvering puller pivotally mounted about a pivot axis, for a date mechanism of a timepiece, said date mechanism comprising a rotation wheel. twenty-four hours driven by the movement of said timepiece, a calendar update finger pivotally integral with said wheel of twenty-four hours around a pivot axis, and a drive star of date, said corrective mechanism comprising a correction star movable pivotally about a pivot axis and located between said finger and said date drive star, and characterized in that said correction star is arranged to mesh with said star of the calendar, and in that said correction star is mounted disengageable said finger under the action of a clutch release mechanism mmandé by said pull tab, said disengagement mechanism having at least two positions including at least a first clutch position, wherein said correction star is arranged to mesh with said finger, and at least a second disengagement position where said star of correction is released from said finger to allow a date correction by its pivoting resulting in the pivoting of said date star.

According to a characteristic of the invention, said disengaging mechanism comprises three positions, a first said clutch position and a third said clutch position, which frame a second said disengaging position.

According to a characteristic of the invention, said disengagement mechanism comprises means for relative displacement of said pivot axis of said correction star with respect to said pivot axis of said finger, by displacement of at least one of said axes.

According to one characteristic of the invention, said relative displacement means comprise means for transforming a one-way movement applied to said operating lever in two pivoting movements in the opposite direction of a first pivotally mounted rocker with respect to a pivot axis, said first rocker having first bearing means arranged to directly or indirectly control the relative displacement of the pivot axis of said correction star relative to the pivot axis of said finger.

According to one characteristic of the invention, said first support means are constituted by a first bearing surface of said first bearing means. flip-flop arranged to bear with a hub integral with said finger, or with a hub integral with said correction star, to move said finger away from said correction star, or respectively to move said correction star away from said finger.

According to a feature of the invention, said first bearing surface is a first oblong slot arranged to receive and guide said integral hub of said finger, or said hub integral with said correction star.

According to another characteristic of the invention, said first support means are arranged to cooperate with complementary support means that comprises a second latch which is arranged to come at a second support surface that it comprises, in support with said integral hub of said finger, or with said hub integral with said correction star, to move said finger away from said correction star, or respectively to move said correction star away from said finger.

According to one characteristic of the invention, said second bearing surface is a second oblong slot arranged to receive and guide said integral hub of said finger, or said hub integral with said correction star.

According to one characteristic of the invention, said means for transforming a one-way movement applied to said operating lever in two pivoting movements in the opposite direction of a first pivotally mounted rocker with respect to a pivot axis comprise at least at a first edge of said first latch, a cam arranged to cooperate with a fulcrum of said pull tab and developing substantially radially with respect to said pivot axis, said cam having, on the same side of a radial end of said axis pivoting and passing through a cusp point, on either side of said cusp, a first track and a second track arranged to generate pivoting movements in the opposite direction said first latch during a centripetal or centrifugal stroke, respectively, of said fulcrum of said pull tab from said first track to said second track, respectively from said second track to said first track, through said cusp point at which reverses the pivoting direction of said first rocker.

According to another characteristic of the invention, said first rocker is driven by drive means or by elastic return means.

According to another characteristic of the invention, said elastic return means are arranged to return said cam bearing on said point of support of said pull tab.

According to another characteristic of the invention, said point of support of said pull tab is constituted by a pin describing a circular rotational movement about said pivot axis of said pull tab.

According to another characteristic of the invention, said date correction mechanism comprises a plate comprising an oblong slot arranged to receive and guide said hub integral with said finger, or said hub integral with said correction star.

According to the embodiments of the invention, the relative mobility between the correction star and the finger is obtained, or else by a mobility of the pivot axis of the correction star, the axis of pivoting of the finger being fixed, or by a mobility of the axis of pivoting of the finger, the pivot axis of the correction star being fixed, or else by a mobility of the pivot axis of the correction star and by a mobility of the pivot axis of the finger.

The invention also relates to a date mechanism comprising a date drive star and a twenty-four hour wheel having a date update finger, and equipped with such a bidirectional date corrector mechanism.

The invention also relates to a timepiece comprising a date mechanism comprising a date drive star and a twenty-four hour wheel comprising a date finger. update date, and equipped with such a bidirectional date corrector mechanism.

Brief description of the drawings

• la figure 1 représente, de façon schématisée et en vue en plan, un premier mode de réalisation de l'invention, dans une première position d'une tirette correspondant à une première position embrayée d'une étoile de correction avec un doigt solidaire d'une roue de vingt-quatre heures ;
• la figure 2 représente, de façon analogue à la figure 1, le même mécanisme dans une deuxième position de la tirette correspondant à une position de correction de quantième, dans une position débrayée de l'étoile de correction par rapport au doigt solidaire de la roue de vingt-quatre heures ;
• la figure 3 représente, de façon analogue à la figure 1, le même mécanisme dans une troisième position de la tirette correspondant à une autre position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 4 représente, de façon schématisée et en vue en plan, un deuxième mode de réalisation de l'invention, dans une première position de la tirette correspondant à une première position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 5 représente, de façon analogue à la figure 4, le même mécanisme dans une deuxième position de la tirette correspondant à la position de correction de quantième, dans une position débrayée de l'étoile de correction par rapport au doigt solidaire de la roue de vingt-quatre heures ;
• la figure 6 représente, de façon analogue à la figure 4, le même mécanisme dans une troisième position de la tirette correspondant à une autre position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 7 représente, de façon schématisée et en vue en plan, un troisième mode de réalisation de l'invention, dans une première position de la tirette correspondant à une première position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 8 représente, de façon analogue à la figure 7, le même mécanisme dans une deuxième position de la tirette correspondant à la position de correction de quantième, dans une position débrayée de l'étoile de correction par rapport au doigt solidaire de la roue de vingt-quatre heures ;
• la figure 9 représente, de façon analogue à la figure 7, le même mécanisme dans une troisième position de la tirette correspondant à une autre position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 10 représente, de façon schématisée et en vue en plan, un quatrième mode préféré de réalisation de l'invention, dans une première position de la tirette correspondant à une première position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 11 représente, de façon analogue à la figure 10, le même mécanisme dans une deuxième position de la tirette correspondant à la position de correction de quantième, dans une position débrayée de l'étoile de correction par rapport au doigt solidaire de la roue de vingt-quatre heures ;
• la figure 12 représente, de façon analogue à la figure 10, le même mécanisme dans une troisième position de la tirette correspondant à une autre position embrayée de l'étoile de correction avec le doigt solidaire de la roue de vingt-quatre heures ;
• la figure 13 représente, de façon schématisée, partielle et en perspective par le dessus, une pièce d'horlogerie comportant un mécanisme correcteur de date, dans un cinquième mode de réalisation dérivé du quatrième mode de réalisation ;
• la figure 14 représente, de façon schématisée, partielle et en perspective par le dessus, le mécanisme de la figure 13, la bascule principale d'appui sur le doigt étant ôtée ;
• la figure 15 représente, de façon schématisée, partielle et en perspective par le dessous, le mécanisme de la figure 13 ;
• les figures 16 à 18 représentent, de façon schématisée, la cinématique du cinquième mode des figures 13 à 15 ;
• la figure 19 représente, de façon schématisée, une variante de doigt solidaire de la roue de vingt-quatre heures, applicable aux différents modes de réalisation.

Other features and advantages of the invention will appear on reading the description which follows, with reference to the appended drawings in which:

• the figure 1 represents, schematically and in plan view, a first embodiment of the invention, in a first position of a pull tab corresponding to a first engaged position of a correction star with a finger secured to a wheel of twenty-four hours ;
• the figure 2 represents, in a similar way to figure 1 the same mechanism in a second position of the pull tab corresponding to a date correction position, in a disengaged position of the correction star relative to the finger integral with the twenty-four hour wheel;
• the figure 3 represents, in a similar way to figure 1 the same mechanism in a third position of the pull tab corresponding to another engaged position of the correction star with the finger integral with the twenty-four hour wheel;
• the figure 4 is schematically shown in plan view, a second embodiment of the invention, in a first position of the pull tab corresponding to a first engaged position of the correction star with the finger integral with the wheel of twenty- four hours ;
• the figure 5 represents, in a similar way to figure 4 , the same mechanism in a second position of the zipper corresponding to the date correction position, in a disengaged position of the correction star relative to the finger integral with the twenty-four hour wheel;
• the figure 6 represents, in a similar way to figure 4 the same mechanism in a third position of the pull tab corresponding to another engaged position of the correction star with the finger integral with the twenty-four hour wheel;
• the figure 7 is schematically shown in plan view, a third embodiment of the invention, in a first position of the pull tab corresponding to a first engaged position of the correction star with the finger secured to the wheel of twenty- four hours ;
• the figure 8 represents, in a similar way to figure 7 the same mechanism in a second position of the pull tab corresponding to the date correction position, in a disengaged position of the correction star relative to the finger integral with the twenty-four hour wheel;
• the figure 9 represents, in a similar way to figure 7 the same mechanism in a third position of the pull tab corresponding to another engaged position of the correction star with the finger integral with the twenty-four hour wheel;
• the figure 10 represents schematically and in plan view, a fourth preferred embodiment of the invention, in a first position of the pull tab corresponding to a first engaged position of the correction star with the finger integral with the wheel of twenty. -four hours ;
• the figure 11 represents, in a similar way to figure 10 , the same mechanism in a second position of the zipper corresponding to the date correction position, in a disengaged position of the star correction relative to the finger integral with the wheel of twenty-four hours;
• the figure 12 represents, in a similar way to figure 10 the same mechanism in a third position of the pull tab corresponding to another engaged position of the correction star with the finger integral with the twenty-four hour wheel;
• the figure 13 shows schematically, partially and in perspective from above, a timepiece comprising a date correction mechanism, in a fifth embodiment derived from the fourth embodiment;
• the figure 14 represents, schematically, partially and in perspective from above, the mechanism of the figure 13 the main support rocker on the finger being removed;
• the figure 15 represents, schematically, partially and in perspective from below, the mechanism of the figure 13 ;
• the Figures 16 to 18 schematically represent the kinematics of the fifth mode of Figures 13 to 15 ;
• the figure 19 represents, schematically, a variant of finger integral with the wheel of twenty-four hours, applicable to different embodiments.

Detailed Description of the Preferred Embodiments

The invention relates to the field of watchmaking, and more particularly that of timepieces comprising date display mechanisms. The invention proposes to provide a solution to the problem of a date correction at any time, and in both directions.

The invention thus relates to a bidirectional date corrector mechanism 100 controlled by a manual pulling lever 1, for a date mechanism 2 of a timepiece 3. This operating puller 1, controlled by the maneuvering of a rod 60 , in particular a crown zipper, more particularly the zipper of the time-setting ring and / or winding of the timepiece 3. This zipper 1 is mobile mounted pivotally about a pivot axis 1X.

According to the invention, this date mechanism 2 comprises, on the one hand, a twenty-four hour wheel 4 driven by the movement of the timepiece 3, and on the other hand a date update finger 5. . This finger 5 is pivotally mounted to the wheel of twenty-four hours around a pivot axis 5X. The date mechanism 2 further comprises a training star of the date 6.

The corrective mechanism 100 comprises a correction star 7 movable pivotally about a pivot axis 7X, and which is located between the finger 5 and the drive star of the date 6.

According to the invention, this correction star 7 is arranged to mesh with the training star of the date 6, it can in particular be permanently engaged with the latter. The daily movement the finger 5 for updating the date can be transmitted to the star of the calendar of the date 6 only through this correction star 7.

In a particular way to the invention, the correction star 7 is mounted disengageable finger 5 under the action of a disengagement mechanism 8.

This clutch mechanism 8 is controlled by the operating puller 1, and it comprises at least two positions, including at least a first clutch position, where the correction star 7 is arranged to mesh with the finger 5 or at least to interfere with its trajectory, since this finger 5 makes only one turn in twenty-four hours, and at least a second release position where the correction star 7 is released from the finger 5 to allow a date correction by its pivoting causing the pivoting of the drive star of the date 6.

Preferably, as visible on the Figures 1 to 12 , the clutch mechanism 8 comprises three positions, a first said clutch position and a third said clutch position, which frame a second said clutch release position.

This clutch mechanism 8 comprises relative displacement means 9 of the pivot axis 7X of the correction star 7 with respect to the pivot axis 5X of the finger 5, by displacement of at least one of said axes. 7X or / and 5X.

In the preferred embodiments as visible on the Figures 1 to 18 and which will be explained later in detail, these relative displacement means 9 include means 10 for transforming a one-way movement applied to said actuating lever 1 in two counter-pivoting movements of a first mounted lever 11 pivoting relative to a pivot axis 11X. This first flip-flop 11 comprises first support means 12 arranged to directly or indirectly control the relative displacement of the pivot axis 7X of the correction star 7 with respect to the pivot axis 5X of the finger 5. Advantageously, the movement of the operating puller 1 is linear.

In a third advantageous embodiment as visible on the Figures 7 to 9 , the first support means 12 are constituted by a first bearing surface 13 of the first lever 11, which is arranged to bear with a hub 51 integral with the finger 5 to move the finger 5 away from the correction star 7 or, in another variant embodiment, to bear with a hub 71 secured to the correction star 7 to move the correction star 7 away from the finger 5.

In an advantageous embodiment, as in the example of the fourth embodiment illustrated by the Figures 10 to 12 the first bearing surface 13 is a first oblong slot 14 arranged to receive and guide the hub 51 integral with the finger 5, or else in other embodiments, arranged to receive and guide the hub 71 integral with the correction star 7.

In a particular embodiment, the first support means 12 are arranged to cooperate with additional support means 15 that includes a second flip-flop 16. This second flip-flop 16 is arranged to come at a second surface. support 17 that it comprises, in support with the hub 51 secured to the finger 5, as visible on the Figures 4 to 6 , to move the finger 5 away from the correction star 7. Or the second rocker 16 is arranged to bear with the hub 71 integral with the correction star 7, as visible on the Figures 1 to 3 , to move the correction star 7 away from the finger 5.

In a particular embodiment, the second bearing surface 17 is a second oblong slot arranged in the second latch 16 for receiving and guiding the hub 51 integral with the finger 5, or for receiving and guiding the hub 71 integral with the correction star 7.

The means 10 for transforming a one-way movement applied to the operating lever 1 in two counter-clockwise pivoting movements of a first pivotally mounted rocker 11 with respect to a pivot axis 11X can be realized in various ways. Preferably, these transformation means 10 comprise at least, at a first edge 19 of this first rocker 11, a cam 20. This cam 20 is arranged to cooperate with a fulcrum 21 of the operating puller 1, and it develops substantially radially with respect to the pivot axis 11X of the first rocker 11.

The cam 20 comprises, on either side of a cusp 23, and preferably on the same side of a radial 22 issuing from this pivot axis 11X and passing through this cusp 23, a first track 24 and a second track 25. The latter are arranged to generate pivoting movements in the opposite direction of the first rocker 11 during a centripetal or centrifugal stroke, respectively, of the fulcrum of the operating rod 1 from the first track 24 to the second track 25, respectively from the second track 25 to the first track 24, via this cusp 23, at which the reversal of the pivoting direction of the first flip-flop 11 is effected.

The first rocker 11 is preferably arranged to be, directly or indirectly, driven by drive means 26 or by elastic return means 27, such as springs or the like. Preferably, the latter elastic return means 27 are arranged to return the cam 20 bearing on the bearing point 21 of the operating puller 1.

In a particularly economical realization, and as visible on the Figures 1 to 12 , the fulcrum 21 of the operating lever 1 is constituted by a first pin 28 describing a circular rotational movement about the pivot axis 1X of the operating puller 1.

Advantageously, the operating lever 1 is constituted by the winding and setting zipper of the timepiece 3.

Preferably, a plate 29, in particular an additional plate, serves to support the entire mechanism 100. This plate 29 comprises, in some embodiments, as visible on the Figures 1 to 9 , an oblong slot 31 arranged to receive and guide the hub 51 secured to the finger 5 or the hub 41 of the twenty-four hour wheel 4 whose finger 5 is pivotally integral, or the hub 71 integral with the star of correction 7.

The elastic return means 27 are advantageously constituted by a spring or a jumper 30, fixed on this plate 29, and which tends to push, directly or more generally indirectly, the correction star 7 towards the finger 5 secured to the wheel of twenty-four hours to put the correction star 7 bearing on this finger 5. These elastic return means 27 may consist in particular of several springs, or the like, independent of each other but all contributing to the return towards one another of the correction star 7 and the finger 5.

According to the embodiments of the invention, the relative mobility between the correction star 7 and the finger 5 can be obtained by a mobility of the pivot axis 7X of the correction star 7, the pivot axis 5X of the finger 5 being fixed, or by a mobility of the pivot axis 5X of the finger 5, the pivot axis 7X of the correction star 7 being fixed, or else by a mobility of the axis of 7X pivoting of the correction star 7 and by a mobility of the pivot axis 5X of the finger 5.

The Figures 1 to 18 illustrate five embodiments according to this principle.

A first embodiment is illustrated by the Figures 1 to 3 , and illustrates the case of the mobility of the pivot axis 7X of the correction star 7, the pivot axis 5X of the finger 5 being fixed.

The declutching mechanism 8 comprises, downstream of the lever 1 operated by the user, a first rocker 11 which is pivotally movable about a pivot axis 11X, and a second rocker 16, which is pivotally movable around of a pivot axis 16X and acts directly on the correction star 7.

The pivot axis 7X of the correction star 7 evolves, by a pin mounted at its hub 71, or preferably by this hub 71 itself, in an oblong slot 31 which includes the plate 29, and which defines end positions 131 and 231 between which the correction star 7 can move.

The mobility of the correction star 7 in the oblong slot 31 is provided by the second flip-flop 16, which has a bore 32 cooperating with the hub 71 of the correction star 7, or with a pin secured to this hub 71. This oblong slot 31 extends preferably substantially perpendicular to a direction which joins the axis 6X of the date drive star 6 to the axis 7X of the correction star 7, and substantially radially with respect to the pivot axis 4X of the twenty-four hour wheel 4, which tends to move the hub 71 of the correction star 7 substantially radially with respect to the finger 5. preferred way, the pivot axis 16X of the second latch 16 is adjacent, and preferably common, with a pivot axis 6X about which pivots the drive star of the date 6, which is preferably retained by a jumper 33 .

• un premier point d'appui 21, réalisé dans l'exemple des figures sous forme d'un premier pion 28, qui est agencé pour venir en appui sur un premier bord 19 de la première bascule 11, soit au niveau d'une première piste 24, de préférence sensiblement droite ou de faible courbure, soit au niveau d'une deuxième piste 25 formant gorge, soit encore au niveau d'un point de rebroussement 23 situé entre cette première piste 24 et cette deuxième piste 25 ;
• un deuxième pion de tirette 36, qui est agencé pour coopérer avec un des crans 37A, 37B, 37C, que comporte le chant d'un bras ressort de tirette 37 fixé sur la platine 29.

The movement source for the clutch control is provided by the operating puller 1. This pull tab 1, is actuated in the example of the figures by a pull arm 34, is pivotally movable about a pull rod axis 1X, for controlling a pivoting movement of the first rocker 11. This puller 1 has two bearing points, preferably made in the form of pins:

• a first fulcrum 21, made in the example of the figures in the form of a first pin 28, which is arranged to bear on a first edge 19 of the first rocker 11, or at a first track 24, preferably substantially straight or low curvature, either at a second groove track 25, or again at a cusp 23 located between this first track 24 and the second track 25;
• a second puller pin 36, which is arranged to cooperate with one of the notches 37A, 37B, 37C, which comprises the edge of a pull spring arm 37 fixed on the plate 29.

The pull tab 1, and therefore the first lever 11, occupy three positions illustrated successively by the Figures 1 to 3 .

A first position and a third clutch position of the first flip-flop 11 are of said normal status, that is to say, engaged, and the correction star 7 is resting on the finger 5. These two positions frame a second position, called declutching, of the first rocker 11 where the correction star 7 is released from the finger 5, allowing and the date correction, by a wheel secured to the correction star 7 and manipulated manually by a correction gear connected to the rod 60.

The figure 1 illustrates the first position of the pull tab, corresponding to the depression of a crown connected to the pull tab 1. The pull tab 1 is held in position by the cooperation of its second pin 36 with a first notch 37A of the pull spring arm 37. Its first pin 28 bears on the first edge 19 of the first rocker 11. This first rocker 11 is pressed against this first pin 28 because it is subjected to a torsion torque exerted by the spring 30: the torsion torque is applied by this spring 30 to the correction star 7, and tends to drive the bore 32 of the second latch 16 in the clockwise direction relative to the pivot axis 16X, as visible on the figure 1 .

As a result, the second flip-flop 16 tends to pivot in the clockwise direction, and thus to press a first bearing face 38 that it has, on the opposite side to the bore 16C with respect to the axis 16X, against one face complementary support 39 that includes a second edge 40 of the first latch 11, opposite its first edge 19. The second flip-flop 16 thus tends to rotate the first latch 11 in the counterclockwise direction, and therefore to come in support on the first pin 28. This first pin 28 therefore limits the angular stroke of the first flip-flop 11, and thus the correction star 7 remains resting on the finger 5. Preferably, the first edge 19 and the second edge 19 edge 40 are substantially straight, or of small curvature, and move away from each other with a radius increasing with respect to the pivot axis 11X of the first rocker 11.

The pivot axis 16X of the second flip-flop 16 is situated substantially between the pivot axis 11X of the first flip-flop 11 and the pivot axis 7X of the correction star 7. The second flip-flop 16 comprises, on the other hand, other than its pivot axis 16X, two arms, the first arm 42 carrying the first bearing face 38, and the other second arm 43 carrying the bore 32, and these two arms 42 and 43 are same side with respect to the pivot axis 5X of the finger 5. The hub 71 of the star of correction 7 abuts on a first end 131 of the oblong slot 31 of the plate.

The figure 2 illustrates the second declutching position. The pull arm 34 is in an intermediate date correction position. Pulling the pull tab 1 causes the second pin 36 to pass through a second notch 37B of the pull spring arm 37. The torque exerted by it in this position is greater than that exerted indirectly by the spring 30. on the first flip-flop 11, and the first pin 28 remains resting on one end of the first track 24, closer to the pivot axis 11X of the first flip-flop 11, at the cusp 23 of the cam 20 constituted by the first edge 19 of the first flip-flop 11.

The pull of the pull tab 1 tends to pivot the first rocker 11 clockwise, to push the first bearing face 38 of the second rocker 16, and turn it in the counterclockwise direction. As a result, the hub 71 of the correction star 7 is driven by the bore 32 of the second flip-flop 16 towards a second end 231 of the oblong slot 31 of the plate 29, at an angle sufficient to exit the plate. reaching the finger 5, and is thus released from the finger 5. Thus, the correction star 7 can be manipulated, both forwards and backwards, for the correction of the date display.

The figure 3 illustrates the third position of the pull tab, corresponding to the maximum traction of a crown connected to the pull tab 1. The first lever 11 comprises, following the first track 24 and the cusp 23, and on the side of the pivot axis 11X, a second track 25, in the form of a groove which is set back from the first track 24, that is to say re-entrant on the side of the complementary bearing face 39 of the first rocker 11 to its second edge 40. The pull tab 1 is held by the support of the second pin 36 in a third notch 37C of the pull spring arm 37.

The pull of the pull tab 1 brings the first pin 28 into the groove of the second track 25, and thereby allows a rotation of the first rocker 11 again in the counterclockwise direction. The second flip-flop 16 rotates clockwise, and returns the correction star 7, in its new angular position after adjustment of the date, in cooperation with the finger 5, since the hub 71 of the correction star 7 abuts on a first end 131 of the oblong slot 31 of the plate.

When one chooses to use the zipper of the time setting mechanism of the timepiece, it is therefore possible to perform the time setting in this position drawn from the pull tab 1 and the associated crown. The timepiece is then returned to its usual position by depressing the crown in the first position of the zipper 1.

In sum, in this first embodiment, the pivot axis 5X of the finger 5 is fixed, while the pivot axis 7X of the correction star 7 is movable.

The other embodiments illustrate the case where the pivot axis 5X of the finger 5 is movable, while the pivot axis 7X of the correction star 7 is fixed. The arrangement of the zipper 1 is the same in these three particular embodiments. On the other hand, the pivot axis 7X of the correction star 7 is fixed with respect to the plate 29. Concerning the mobility of the finger 5, there are two possibilities: either the finger 5 is mobile, notably radially, with respect to the wheel of twenty-four hours 4, or it is the assembly consisting of the twenty-four hour wheel 4 and the finger 5 which is movable. This second alternative is illustrated by the following embodiments, but does not constitute a limitation of the invention.

The second embodiment is illustrated by the Figures 4 to 6 .

The pull tab 1 always cooperates with a first rocker 11. However, the arrangement thereof is different from that of the first mode, and, preferably, the first track 24 and the second track 25 are substantially straight, and move closer together. one of the other with a radius increasing with respect to the pivot axis 11X of the first rocker 11.

Unlike the first mode, the pivot axis 7X of the correction star 7 is located substantially between the pivot axis 11X of the first flip-flop 11 and the pivot axis 16X of the second flip-flop 16. The two arms, respectively first arm 42 and second arm 43, of the second latch 16 are on either side of the pivot axis 5X of the finger 5.

The second flip-flop 16 is held in contact with the first flip-flop 11 by means of a spring, not shown in the figures.

In this second embodiment, the hub 41 to the pivot axis 4X of the twenty-four hour wheel 4 is movable in an oblong slot 31 of the plate 29, which allows it to move while remaining in contact with the gear of the center wheel of the movement, which feeds it. This oblong slot 31 preferably extends substantially in the direction that joins the axis 4X of the twenty-four hour wheel 4 to the axis 7X of the correction star 7, which tends to move the hub 41, and therefore the finger 5, substantially radially to the correction star 7. Return means, such as a spring, not shown in the figures, tend to move the hub 41 away from the correction star 7, pushing back or pulling this hub 41 at the end 231 of the oblong slot 31 furthest from the correction star 7.

The second flip-flop 16 comprises, at its first arm 42, a first bearing face 38, which cooperates with the first flip-flop 11 similarly to the first embodiment. It still comprises, at its second arm 43, a second face support 44 which rotates angularly in the same direction as the first bearing face 38, these two faces being located on the same side of the pivot axis 16X. This second bearing face 44 is facing a hub 41 that includes the twenty-four hour wheel 4, and is kept at a distance from the latter during normal operation, so as not to unnecessarily slow the movement. The twenty-four hour wheel 4 is always engaged with the center wheel of the movement, regardless of the position of its pivot axis 4X, or of a hub 41 which it comprises, with respect to the oblong slot 31 of the plate 29.

The figure 4 illustrates the first depressed position of the pull tab 1, which is held in position by the cooperation of its second pin 36 with a first notch 37A of the pull spring arm 37. Its first pin 28 bears on the first track 24 of the first flip flop 11. This first flip-flop 11 is pressed against this first pin 28, because it is subjected to a torsion torque exerted by the spring which plates the second flip-flop 16 against it: the torsion torque is applied by this spring to the second flip-flop 16, and tends to press the second bearing face 44, which comprises the second arm 43 of the second flip-flop 16, on the hub 41 of the twenty-four hour wheel 4, pushing this hub 41 to a first end 131 oblong light 31 on the side of the correction star 7, and therefore tends to push the finger 5 in cooperation with the correction star 7. The finger 5 can not therefore avoid the training of the star correction 7 through the second flip-flop 16, held in contact with the first flip-flop 11 by means of the spring.

The figure 5 illustrates the second declutching position. The pull arm 34 is in an intermediate date correction position. Pulling the pull tab 1 causes the second pin 36 to pass through a second notch 37B of the pull-spring arm 37. The torque exerted by it in this position is greater than that exerted indirectly by the spring which pushes the second flip-flop 16 towards the first flip-flop 11, and the first pin 28 bears on the cusp 23. The pull of the pull tab 1 thus tends to pivot the first rocker 11, to push back the first bearing face 38 of the second rocker 16, and rotate it anti-clockwise.

As a result, the second bearing surface 44, which the second arm 43 of the second lever 16 has, pivots, and allows the hub 41 of the twenty-four hour wheel 4, which tends to be distant from the star correction device 7 by a return spring not shown in the figures, to move in the oblong slot 31 on the side opposite the correction star 7, in a path sufficient to escape thereto, to reach the second end of light 31 the position shown on the figure 5 . Thus, the correction star 7 can be manipulated, both forwards and backwards, for the correction of the display of the date.

The advantage is that the twenty-four hour wheel 4 returns to the same place after the correction, without loss of mark.

The figure 6 illustrates the third position of the pull tab, corresponding to the maximum traction of a crown connected to the pull tab 1, which is maintained by the support of the second pin 36 in a third notch 37C of the pull spring arm 37. The pull of the puller 1 brings the first pin 28 into the groove of the second track 25. This movement therefore allows a rotation of the first rocker 11 again in the counter-clockwise direction. The second flip-flop 16 pivots in the clockwise direction, and brings back the second support face 44, which the second arm 43 of the second flip-flop 16, has on the hub 41 of the twenty-four hour wheel 4, and in abutment on the first end 131 of the light 31, and therefore tends to push the finger 5 in cooperation with the correction star 7. The finger 5 can not therefore avoid the drive of the correction star 7.

The third embodiment is illustrated by the Figures 7 to 9 . In this embodiment, the combination of the first flip-flop 11 and the second flip-flop 16 is replaced by a first flip-flop 11 single, which comprises, on the same side of its pivot axis 11X preferably located at one of its ends, a first arm 46 and a second arm 47. The first latch 11 is held in contact against the pull tab 1 by biasing means which tend to rotate it in a counter-clockwise direction. These return means are applied at a driving point 48 of the first lever 11. They may consist of a spring, not shown in the figures, or by an intermediate rocker itself having a spring as visible in another fifth embodiment on the Figures 13 to 15 , Or other.

The pivot axis 4X of the twenty-four hour wheel 4 is, as in the second embodiment, movable in an oblong slot 31 of the plate 29, which allows it to move while remaining in contact with the gear of the center wheel of the movement, which feeds it. This oblong slot 31 preferably extends substantially in the direction that joins the axis 4X of the twenty-four hour wheel 4 to the axis 7X of the correction star 7, which tends to move the hub 41, and therefore the finger 5, substantially radially to the correction star 7. The movements of the pull tab 1, and the cooperation of the second pin 36, in the different positions, with the notches 37A, 37B, 37C, the spring arm pull tab 37, are similar to the other embodiments.

The figure 7 illustrates the first position of the pull tab, corresponding to the depression of the pull tab 1. The pull tab 1 is held in position by the cooperation of its second pin 36 with a first notch 37A of the pull spring arm 37, not shown in this figure . Its first pin 28 is supported on the first edge 19, which is located at the first arm 46, on the first track 24. This position of the first rocker 11 allows a second bearing surface 50 that includes the second arm 47 to bear on the hub 41 of the twenty-four hour wheel 4, to maintain it at a first end 131 of the oblong slot 31 on the side of the correction star 7, and thus to engage the finger 5 with the correction star 7.

The figure 8 illustrates the second declutching position. The pull arm 34 is in an intermediate date correction position. The pulling of the pull tab 1 causes the passage of the second pin 36 on a second notch 37B of the pull spring arm 37, not shown in this figure. The torque exerted by the latter, in this position, is greater than that exercised, indirectly, the biasing means which push the first latch 11 towards the pull tab 1, and the first pin 28 remains in abutment at the cusp 23 The pull of the pull rod 1 thus tends to pivot the first rocker 11, to push back the second bearing face 50 of the second arm 47, away from the correction star 7. As a result, the hub 41 of the twenty-four hour wheel 4, which tends to be moved away from the correction star 7 by a return spring not shown in the figures, can move in the oblong slot 31 on the opposite side to the correction star 7, in a path sufficient to escape thereto, to reach the position at the second end 231 of the oblong slot 31 shown in FIG. figure 8 . Thus, the correction star 7 can be manipulated, both forwards and backwards, for the correction of the display of the date.

The figure 9 illustrates the third position of the pull tab, corresponding to the maximum traction of a crown connected to the pull tab 1, which is maintained by the support of the second pin 36 in a third notch 37C of the pull spring arm 37. The pull of the puller 1 brings the first pin 28 into the groove of the second track 25. This movement therefore allows a rotation in the opposite direction of the first lever 11, which brings the second bearing face 50 of the second arm 47 back into position. on the hub 41 of the twenty-four hour wheel 4, by pushing it at the first end 131 of the oblong slot 31 closest to the correction star 7, and therefore tends to push the finger 5 in cooperation with the correction star 7. The finger 5 can not therefore avoid the training of the correction star 7.

The fourth embodiment is illustrated by the Figures 10 to 12 . As for the third embodiment, the combination of the first flip-flop 11 and the second flip-flop 16 is replaced by a first single flip-flop 11, which comprises, on the same side of its pivot axis 11X preferably located at one of its ends. , a first arm 46 and a second arm 47. The first lever 11 is held in contact against the pull tab 1 by biasing means which tend to rotate it in a counterclockwise direction. These return means are applied at a driving point 48 of the first lever 11. They may consist of a spring, not shown in the figures, or by an intermediate rocker itself comprising a spring or the like.

The pivot axis 4X of the twenty-four hour wheel 4 is movable both in an oblong slot 31 of the plate 29, which allows it to move while remaining in contact with the gear of the center wheel. movement, which feeds it, similarly to that of the second and third modes described above, and in a first oblong slot 14, which is formed at the second arm 47 of the first flip-flop 11. This first oblong light 14 extends in a direction oblique to the direction of the oblong slot 31 of the plate 29. Any substantially tangential movement of the second arm 47 relative to the correction star 7 then drives the hub 41 substantially radially relative to 7. The movements of the pull tab 1, and the cooperation of the second pin 36, in the different positions, with the notches 37A, 37B, 37C, of the pull-spring arm 37, are similar to the other es embodiments.

The figure 10 illustrates the first position of the pull tab, corresponding to the depression of the pull tab 1. The pull tab 1 is held in position by the cooperation of its second pin 36 with a first notch 37A of the pull spring arm 37, not shown in this figure . Its first pin 28 bears on the first edge 19, which is located at the first arm 46, on the first track 24. This position of the first rocker 11 tends to rotate, and pull the second arm 47, forcing the hub 41 of the twenty-four hour wheel 4 to occupy a first holding position at a first end 114 of the first oblong slot 14 and a first end 131 of the oblong slot 31, in a position where the finger 5 can mesh with the correction star 7.

The figure 11 illustrates the second declutching position. The pull arm 34 is in an intermediate date correction position. The pulling of the pull tab 1 causes the passage of the second pin 36 on a second notch 37B of the pull spring arm 37, not shown in this figure. The torque exerted by the latter, in this position, is greater than that exercised, indirectly, the biasing means which push the first latch 11 towards the pull tab 1, and the first pin 28 remains in abutment at the cusp 23 This position of the first rocker 11 tends to rotate, and to push the second arm 47, forcing the hub 41 of the twenty-four hour wheel 4 to occupy a second holding position at a second end 214 of the first oblong light 14 and at a second end 231 of the oblong slot 31, in a position where the finger 5 is clear of the correction star 7.

The figure 11 illustrates the third position of the pull tab, corresponding to the maximum traction of a crown connected to the pull tab 1, which is maintained by the support of the second pin 36 in a third notch 37C of the pull spring arm 37. The pull of the puller 1 brings the first pin 28 into the groove of the second track 25. This movement therefore allows a rotation in the opposite direction of the first lever 11, which brings the second arm 47 into traction by forcing the hub 41 to the twenty-four hour wheel 4 to occupy a first holding position at a first end 114 of the first oblong slot 14 and at a first end 131 of the oblong slot 31, in a position where the finger 5 can mesh with the correction star 7.

The invention also relates to a date mechanism 2 comprising a training star of the date 6 and a wheel of twenty-four hours 4 comprising a date update finger 5, and equipped with such bidirectional date correction mechanism 100.

The invention also relates to a timepiece 3 comprising a date mechanism 2 comprising a date drive star of the date 6 and a twenty-four hour wheel 4 comprising a date update finger 5, and equipped with such a bidirectional date corrector mechanism 100.

The Figures 13 to 15 illustrate a timepiece 3 having a date corrector mechanism 100, in a fifth embodiment derived from the fourth embodiment. The transmission of movement to the hub 51 of the finger 5 is by a first rocker 11, which comprises a second arm 47 arranged as that of the fourth mode illustrated by the Figures 10 to 12 , with a light 14. This first rocker 11 differs from that of the fourth mode, in that it does not have directly, at its first arm 46, a first edge equipped with a cam 9. The disengaging mechanism uses a control rocker 52, which comprises a spring 53 tending to push it towards the pull tab 1, and which has, facing the latter, such an edge 19 provided with a cam 20 having, as before, a first track and a second track separated by a cusp. This control lever 52 cooperates with the pull tab 1 and the pull spring arm 37 in the same way as in the other four previous embodiments.

The relative displacement means 9 of the pivot axis 7X of the correction star 7 with respect to the pivot axis 5X of the finger 5, are then constituted by the motion transformation means 10 here. more specifically constituted by the control rocker and the pull tab 1 on the one hand, and by the first rocker 11, which is driven by the control rocker at its drive point 48, on the other hand.

These Figures 13 to 15 still illustrate a variant applicable to all other embodiments, in which the finger 5 does not cooperate directly with the correction star 7 which cooperates with the star 6 of the date drive, but with a star 7A coaxial and solidarity in pivoting of this correction star 7.

The figures 14 and 15 represent the gear train between the rod 60 and the correction pinion 70, and the complete chain to the center wheel.

The kinematics of the fifth embodiment is represented on the Figures 16 to 18 , on which are visible the elastic return means 27 of the correction star 7, in the form of a jumper 30. The latch 52 is shown with its spring 53, which cooperates with a stop 27A visible on the figure 15 . This spring, associated with a transmission pivot pin 54 between the first rocker 11 and the control rocker 52, makes it possible to maintain or recall elastically the latter in the position shown in FIG. figure 16 .

The figure 19 shows a variant 55 of finger 5 integral with the wheel of twenty-four hours, which is applicable to the various embodiments above. This finger 55 is an elastic finger, preferably in the form of a circular sector. It comprises a bearing face 55 intended to cooperate with the correction star 7, and which extends at the end of a peripheral spring arm 57. This arm 57 also has a stop face 59 recessed, which is arranged to cooperate, in stroke limitation, with a stop 58 installed on the twenty-four hour wheel 4.

The advantage of this variant is to allow, if necessary, a correction action performed in the opposite direction, without deterioration of the mechanism: during a return back the end of the bearing face 55 may be substantially radially offset from the correction star 7, by deflection of the spring arm 57.

With the finger 5 of the variants presented above, the arming mechanism is performed between the fixed finger and the jumper 30 of the correction star 7. In this variant of the spring finger 55, the arming is progressive, and balanced between this spring 57 and the jumper 30 of the star of correction 7. This arrangement allows you to accumulate more energy for a longer period of time.

Claims (16)

1. Date mechanism (2) of a timepiece, including a two-directional date corrector mechanism (100) controlled by an actuating pull-out piece (1) pivotally mounted about a pivot axis (1 X), for a date mechanism (2) of a timepiece (3), said date mechanism (2) comprising a twenty-four hour wheel (4) driven by the movement of said timepiece (3), a date updating finger (5) mounted to pivot integrally with said twenty-four hour wheel (4) about a pivot axis (5X), and a date driving star-wheel (6), said corrector mechanism (100) comprising a corrector star-wheel (7) pivotally moveable about a pivot axis (7X) and located between said finger (5) and said date driving star-wheel (6), characterized in that said corrector star-wheel (7) meshs with said date driving star-wheel (6), and in that said corrector star-wheel (7) is arranged to be uncouplable from said finger (5) under the action of an uncoupling mechanism (8) controlled by said pull-out piece (1), said uncoupling mechanism (8) having at least two positions including at least a first coupling position in which said corrector star-wheel (7) meshs with said finger (5), and at least a second uncoupling position in which said corrector star-wheel (7) is released from said finger (5) to enable the date to be corrected by the pivoting of said corrector star-wheel causing said date star-wheel (6) to pivot.
2. Date mechanism (2) according to claim 1, characterized in that said uncoupling mechanism (8) has three positions including a first coupling position and a third coupling position, on either side of a second uncoupling position.
3. Date mechanism (2) according to claim 1 or 2, characterized in that said uncoupling mechanism (8) includes a means (9) of relative movement of said pivot axis (7X) of said corrector star-wheel (7) relative to said pivot axis (5X) of said finger (5), by moving at least one of said axes (7X; 5X).
4. Date mechanism (2) according to claim 3, characterized in that said means (9) of relative movement includes a means (10) of transforming a one-directional motion applied to said actuating pull-out piece (1) into two pivoting movements in opposite directions of a first lever (11) pivotally mounted relative to a pivot axis (11X), said first lever (11) including a first means (12) of abutment arranged to directly or indirectly control the relative movement of said pivot axis (7X) of said corrector star-wheel (7) relative to said pivot axis (5X) of said finger (5).
5. Date mechanism (2) according to claim 4, characterized in that said first means (12) of abutment is formed by a first bearing surface (13) of said first lever (11) arranged to abut with a hub (51) integral with said finger (5), or with a hub (71) integral with said corrector star-wheel (7), to move said finger (5) away from said corrector star-wheel (7) or respectively to move said corrector star-wheel (7) away from said finger (5).
6. Date mechanism (2) according to claim 4 or 5, characterized in that said first bearing surface (13) is a first oblong hole (14) arranged to receive and guide said hub (51) integral with said finger (5), or said hub (71) integral with said corrector star-wheel (7).
7. Date mechanism (2) according to any of claims 4 to 6, characterized in that said first means (12) of abutment is arranged to cooperate with a complementary means (15) of abutment comprised in a second lever (16) which is arranged, on a second bearing surface (17) comprised therein, to abut with said hub (51) integral with said finger (5), or with said hub (71) integral with said corrector star-wheel (7), so as to move said finger (5) away from said corrector star-wheel (7) or respectively to move said corrector star-wheel (7) away from said finger (5).
8. Date mechanism (2) according to claim 7, characterized in that said second bearing surface (17) is a second oblong hole arranged to receive and guide said hub (51) integral with said finger (5), or said hub (71) integral with said corrector star-wheel (7).
9. Date mechanism (2) according to claim 4, characterized in that said means (10) of transforming a one-directional movement, applied to said actuating pull-out piece (1), into two opposite pivoting motions of a first lever (1) pivotally mounted relative to a pivot axis (11X), includes at least, on a first edge (19) of said first lever (11), one cam (20) arranged to cooperate with a point of abutment (21) of said actuating pull-out piece (1) and extending substantially radially relative to said pivot axis (11X), said cam (20) comprising, on the same side of a radial line derived from said pivot axis (11X) and passing through a turn-back point (23), on either side of said turn-back point (23), a first path (24) and a second path (25) arranged to generate pivoting motions in opposite directions of said first lever (11) during a centripetal, respectively centrifugal travel, of said point of abutment of said pull-out piece (1) from said first path (24) towards said second path (25), respectively from said second path (25) towards said first path (24), passing through said turn-back point (23) at which the reversal of direction of pivoting of said first lever (11) occurs.
10. Date mechanism (2) according to claim 4, characterized in that said first lever (11) is driven by a drive means (26) or by an elastic return means (27).
11. Date mechanism (2) according to claims 9 and 10, characterized in that said elastic return means (27) is arranged to return said cam (20) into abutment on said point of abutment (21) of said actuating pull-out piece (1).
12. Date mechanism (2) according to claim 9, characterized in that said point of abutment (21) of said actuating pull-out piece (1) is formed by a first pin (28) describing a circular rotational motion about said pivot axis (1X) of said actuating pull-out piece (1).
13. Date mechanism (2) according to claim 5, characterized in that it includes a plate (29) comprising an oblong hole (31) arranged to receive and guide said hub (51) integral with said finger (5), or said hub (71) integral with said corrector star-wheel (7).
14. Date mechanism (2) according to any of claims 1 to 13, characterized in that said actuating pull-out piece (1) is formed by the winding and time-setting pull-out piece of said timepiece (3).
15. Date mechanism (2) according to any of claims 1 to 13, characterized in that said finger (5) is formed by a finger-spring (55) which is an elastic finger comprising a bearing surface (55) arranged to cooperate with said corrector star-wheel (7), and which extends at the end of a peripheral spring arm (57) comprised in a recessed stop surface (59), arranged to cooperate, as an end of travel limitation, with a stop member (58) mounted on said twenty-four hour wheel (4), the end of said bearing surface (55) being moveable substantially radially relative to said corrector star-wheel (7), by bending said spring arm (57), in the case of actuation in the opposite direction.
16. Timepiece (3) comprising a date mechanism (2) according to any of the preceding claims.

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