HK1184242B - Two-directional date corrector mechanism for date mechanism; date mechanism; timepiece - Google Patents

Description

Bidirectional date correction mechanism for date mechanism, date mechanism and timepiece

Technical Field

The present invention relates to a bidirectional date correction mechanism for a date mechanism (date mechanism) of a timepiece, controlled by an actuation pull-out member pivoting about a pivot axis. The date mechanism includes: a 24-hour wheel driven by the movement of the timepiece, a date updating finger mounted to pivot about a pivot axis integrally with the 24-hour wheel, and a date driving star wheel. The correction mechanism includes a correction star wheel pivotally movable about a pivot axis and located between the finger and the date driving star wheel.

The invention also relates to a date mechanism comprising a date-driving star wheel and a 24-hour wheel with a date-updating finger, and provided with a date correction mechanism of this type.

The invention also relates to a timepiece comprising a date mechanism as follows: the date mechanism comprises a date driving star wheel and a 24-hour wheel with a date updating finger, and is provided with a date correction mechanism of this type.

Background

The present invention relates to the field of timepieces, and more particularly to the field of timepieces comprising a date display mechanism.

The date mechanism is a complex mechanism.

In the case of a timepiece with a simple calendar mechanism (calendar mechanism), the date must be corrected manually for months with days less than 31 days. Generally, the correction is carried out by rotating the winding stem to the quick date setting position, or by actuating a button dedicated to this purpose.

Updating the date is not always easy, especially if the user wishes to change the date near midnight.

Furthermore, most known mechanisms do not allow for a backward change of date.

US patent No.212882 in the name of Baillot filed 1879 discloses a date correction mechanism using a pawl which cooperates with the toothing of a 31-day wheel under the action of a button to move the wheel forward.

From EP patent No.1115041 in the name of Chopard manual SA a quick manual date correction mechanism for a movement is known, which comprises a winding stem with three axial positions, a sliding pinion and a date star wheel. The mechanism comprises a swinging correction lever comprising, at one of its ends, a beak cooperating with the toothing of the date star wheel and, at the other end, a finger returned by a spring against a cam with at least one lifting member. When the winding stem is in the intermediate axial date correction position, the cam is carried by a correction wheel (which is driven by the sliding pinion via the kinematic connection). The lifting elements of this cam have pointed ends so that when the winding stem is not in the date-setting position, the return spring of the finger on the cam returns said finger between the two lifting elements of the cam, so that the beak of the lever is no longer in contact with the date star wheel. This mechanism allows the date to be adjusted forward by rotating the winding stem in any direction, but it does not allow the date to be adjusted backward.

EP patent No.1,660,952 in the name of Vaucher manual calendar SA discloses a manual date corrector for simple calendar mechanisms and an automatic date corrector for perpetual calendars. The corrector comprises means for programming the correction of the date display according to the number of days of the current month entered by the user or by an automatic mechanism, and means for retrieving the correction on the actual last day of the month concerned. The programming means comprise a set of coupled wheels formed by two coaxial toothed discs which can be driven in opposite directions, one of which is driven by a 31-day wheel and the other by a control means which sets the number of days of the month, so as to automatically correct the display means at the end of the current month. The two discs are coupled by a spring and pawl system that allows one disc to rotate independently of the other disc. The pawl also causes the second disc (which is driven by the control member) to drive the other disc first when rotated in the first direction and secondly not when rotated in the other direction and when the second disc is now spring wound only. In addition to these disks, the programming means includes: a finger fixed to the 31-day wheel; a lever pivoted on the second disc and actuated by the finger on the last day of the current month, which lever then actuates another independent lever of the coupled wheel set. The further lever locks the second disc and releases it when actuated, so that the first disc moves rapidly under the action of the spring to correct the date display. This complicated device performs correction both manually and automatically, but the device can only adjust the date backwards and not forwards.

Similarly, EP patent No.1538494 in the name of Watch-U-license AG is known, which discloses a quick date-setting device comprising a pull-out member driven by the winding stem, which pivots a lever carrying a lever toothed shaft which, in an intermediate position of the winding stem, meshes with a wheel coupled to a set of date-correcting wheels provided with fingers able to act on a date-indicating crown. The device requires an intermediate gear shaft assembly and is unidirectional.

EP patent No.0230878 in the name of compatibility SA proposes a date corrector comprising an arbor which drives, via a gear train, a correcting star wheel directly meshing with the date star wheel. However, this simple system cannot be used all the time, since near midnight the date star wheel cooperates with the elastic finger of the 24-hour wheel, where any manual intervention would damage the movement. In addition, the mechanism can only move the date forward and not backward.

A more sophisticated date correction mechanism for perpetual calendars is disclosed in EP patent No.1488290 in the name of manual Roger Dubuis SA. This mechanism is indicated at the position of the annual cam (annual cam) and is detected by a sensor and set to operate automatically, but cannot be used for manual correction.

However, these known mechanisms all use a kinematic chain of winding mechanism and sliding gear shaft, the operation of updating the date occurs every day, requires a high precision and causes wear of the winding and time-setting mechanisms. Most importantly, although some mechanisms allow the winding stem to rotate in both directions to advance the date, it is only possible to change the date in the direction of a single higher date, which of course means that the date is changed from day 31 to day 1 to return to a date lower than the date previously displayed.

EP patent No.1953611 in the name of Compagnie des Montres Longines, francilon SA discloses a bidirectional correction mechanism for display devices such as date mechanisms. The mechanism provides a reliable and effective solution to the problem of correcting the date backwards. The two racks tend to act in opposite ways on the date display wheel. The first rack is controlled by a first lever cooperating with a snail cam (which is integral with the date wheel) which is in turn driven daily by a finger integral with a 24-hour wheel. The second rack is controlled by a second lever cooperating with a circumferential cam driven by the winding stem and arranged to move the first lever away from the snail cam. Thus, the date wheel can pivot in both directions. However, this improved mechanism comprises many components, making the mechanism expensive and the space required (especially in view of the circumferential cam) makes it difficult to adapt it to all movements.

EP application No.0871093A1 in the name of ORIS is also known, which discloses a manual date indication correction mechanism in the form of a toothed ring. Due to the action of the disengaging means, the first or second device can be coupled to the date indicator one at a time. The first means are used only for correcting the date indicator and the second means are used for correcting the hour and minute hands and the date indicator. The second device is a wheel set comprising a first star wheel able to mesh with the toothed ring and a second star wheel able to mesh with a finger carried by the intermediate wheel. The intermediate wheel is engaged with the hour wheel. The disengagement member is a plate pivoted on a spindle carrying the intermediate wheel, which carries the wheel set and is returned by a spring. When the first star wheel is engaged with the ring, the set of wheels is engaged. The engagement of the wheel set is released when the first device is actuated. The first star wheel is no longer engaged with the ring, the teeth of which push the teeth of the first star wheel out of their trajectory against the return force of the spring. The engagement and disengagement positions are defined by the position of the pin fixed to the plate with respect to the elongated hole of the plate, which is in particular integral with the spring. Such a mechanism is in accordance with the description of the preamble of the claims of the present patent application.

Disclosure of Invention

The invention proposes a solution to the problem of correcting the date at any time and in both directions, using the fewest possible number of components and with minimum space requirements.

The invention therefore relates to a bidirectional date correction mechanism for a date mechanism of a timepiece, controlled by an actuating pull-out member mounted pivotally about a pivot axis. The date mechanism comprises a 24-hour wheel driven by the movement of the timepiece, a finger for updating the date mechanism mounted so as to pivot about a pivot axis integrally with the 24-hour wheel, and a date-driving star wheel (star-wheel). The correction mechanism includes a correction star wheel pivotally movable about a pivot axis and located between the finger and the date driving star wheel. The invention is characterized in that said corrector star-wheel is arranged to engage with said date driving star-wheel and is arranged to be uncoupled from said finger by means of a uncoupling mechanism controlled by said pull-out member, said uncoupling mechanism having at least two positions, including at least one first coupling position in which said corrector star-wheel is arranged to engage with said finger, and at least one second uncoupling position in which said corrector star-wheel is released from said finger, so that the date can be corrected by pivoting of said corrector star-wheel which causes pivoting of said date driving star-wheel.

According to one feature of the invention, the uncoupling mechanism has three positions, including a first coupling position and a third coupling position, on either side of the second uncoupling position.

According to one feature of the invention, the uncoupling mechanism comprises a relative movement component which, through the movement of at least one of the axes, effects the movement of the pivot axis of the correction star wheel with respect to the pivot axis of the finger.

According to one feature of the invention, the relative movement means comprise conversion means which convert the movement in one direction applied to the actuation pull-out member into two pivoting movements in opposite directions of a first lever pivotally mounted with respect to a pivoting axis, the first lever comprising a first abutment member arranged to directly or indirectly control the relative movement of the pivoting axis of the corrector star wheel with respect to the pivoting axis of the finger.

According to one feature of the invention, said first abutment member is formed by a first bearing surface of said first lever, said first bearing surface being arranged to abut against a hub (hub) integral with said finger in order to remove said finger from said corrector star-wheel, or to abut against a hub integral with said corrector star-wheel in order to remove said corrector star-wheel from said finger.

According to a feature of the invention, said first bearing surface is a first elongated hole arranged to receive and guide said hub integral with said finger or said hub integral with said corrector star-wheel.

According to another characteristic of the invention, said first abutment member is arranged to cooperate with a complementary abutment member comprised in a second lever arranged to abut, on a second bearing surface comprised therein, with said hub integral with said finger in order to remove said finger from said corrector star-wheel, or with said hub integral with said corrector star-wheel in order to remove said corrector star-wheel from said finger.

According to a feature of the invention, said second bearing surface is a second elongated hole arranged to receive and guide said hub integral with said finger or said hub integral with said corrector star-wheel.

According to one feature of the invention, the conversion means which convert the motion applied to the actuation pull-out member in one direction into two opposite pivoting motions of a first lever pivotally mounted with respect to a pivoting axis comprise, on a first edge of the first lever, at least one cam which is arranged to cooperate with an abutment point of the actuation pull-out member and extends substantially radially with respect to the pivoting axis, the cam comprising, on the same side of a radial line originating from the pivoting axis and passing through a return point and on both sides of the return point, a first path and a second path which are arranged respectively during the centripetal stroke of the abutment point of the actuation pull-out member from the first path through the return point to the second path and during the centrifugal stroke of the abutment point of the actuation pull-out member from the second path through the return point to the first path A pivoting movement in the opposite direction of the first lever is generated, wherein the pivoting direction of the first lever is reversed at the return point.

According to another characteristic of the invention, the first lever is driven by a driving member or by an elastic return member.

According to another feature of the invention, the elastic return means are arranged to return the cam into abutment against the abutment point of the actuation pull-out member.

According to another feature of the invention, the abutment point of the actuation pull-out member is formed by a pin defining a circular rotational movement about the pivot axis of the actuation pull-out member.

According to another feature of the invention, the bidirectional date correction mechanism comprises a plate comprising an elongated hole arranged to receive and guide the hub integral with the finger or the hub integral with the correction star wheel.

According to an embodiment of the invention, when the pivoting axis of the finger is locked, the relative movement between the corrector star and the finger can be obtained by a movement of the pivoting axis of the corrector star; or by a movement of the pivoting axis of the finger when the pivoting axis of the corrector star is locked; or by correcting the movement of the pivot axis of the star wheel and of the finger.

The invention also relates to a date mechanism comprising a date-driving star wheel and a 24-hour wheel with a date-updating finger, and provided with a bidirectional date correction mechanism of this type.

The invention also relates to a timepiece comprising a date mechanism as follows: the date mechanism comprises a date driving star wheel and a 24-hour wheel with a date updating finger, and is provided with a bidirectional date correction mechanism of this type.

Drawings

Other features and advantages of the present invention will become apparent upon reading the following description with reference to the accompanying drawings, in which:

fig. 1 shows a schematic plan view of a first embodiment of the invention, with the pull-out member in a first position in which the corrector star-wheel is in a first coupling position with the finger integral with the 24-hour wheel.

Fig. 2 shows, in a similar way to fig. 1, the same mechanism, with the pull-out member in a second position, which is a date correction position, in which the correction star wheel is in a decoupled position with respect to the finger integral with the 24 hour wheel.

Fig. 3 shows, in a similar way to fig. 1, the same mechanism, with the pull-out member in a third position, in which the corrector star wheel is in another coupling position with the finger integral with the 24-hour wheel.

Fig. 4 shows a schematic plan view of a second embodiment of the invention, with the pull-out member in the first position, in which the corrector star-wheel is in the first coupling position with the finger integral with the 24-hour wheel.

Fig. 5 shows, in a similar way to fig. 4, the same mechanism, with the pull-out member in a second position, which is a date correction position, in which the correction star wheel is in a decoupled position with respect to the finger integral with the 24 hour wheel.

Fig. 6 shows, in a similar way to fig. 4, the same mechanism, with the pull-out member in a third position, in which the corrector star wheel is in another coupling position with the finger integral with the 24-hour wheel.

Figure 7 shows a schematic plan view of a third embodiment of the invention, with the pull-out member in the first position, in which the corrector star-wheel is in the first coupling position with the finger integral with the 24-hour wheel.

Fig. 8 shows, in a similar way to fig. 7, the same mechanism, with the pull-out member in a second position, which is a date correction position, in which the correction star wheel is in a decoupled position with respect to the finger integral with the 24 hour wheel.

Fig. 9 shows, in a similar way to fig. 7, the same mechanism, with the pull-out member in a third position, in which the corrector star wheel is in another coupling position with the finger integral with the 24-hour wheel.

Fig. 10 shows a schematic plan view of a fourth preferred embodiment of the invention, with the pull-out member in the first position, in which the corrector star-wheel is in the first coupling position with the finger integral with the 24-hour wheel.

Fig. 11 shows, in a similar way to fig. 10, the same mechanism, with the pull-out member in a second position, which is a date correction position, in which the correction star wheel is in a decoupled position with respect to the finger integral with the 24 hour wheel.

Fig. 12 shows, in a similar way to fig. 10, the same mechanism, with the pull-out member in a third position, in which the corrector star wheel is in another coupling position with the finger integral with the 24-hour wheel.

Fig. 13 shows a schematic partial perspective top view of a timepiece comprising a date correction mechanism in a fifth embodiment evolved from the fourth embodiment.

Fig. 14 shows a schematic partial perspective top view of the mechanism of fig. 13, with the primary lever abutting on the finger omitted.

Fig. 15 shows a schematic partial perspective bottom view of the mechanism of fig. 13.

Fig. 16 to 18 show schematic views of details of the drive chain of the fifth embodiment of fig. 13 and 15.

Figure 19 shows a schematic view of a variant of the finger integral with the 24-hour wheel, which can be applied to various embodiments.

Detailed Description

The present invention relates to the field of timepieces, and more particularly to the field of timepieces comprising a date display mechanism. The invention thus proposes a solution to the problem of correcting the date at any time and in both directions.

The invention therefore concerns a bidirectional date correction mechanism 100 for a date mechanism 2 of a timepiece 3, the mechanism 100 being controlled by actuating a pull-out member 1. The actuating pull-out part 1 controlled by actuating stem 60 is in particular a pull-out part with a crown, more particularly a pull-out part for the time setting and/or winding of a timepiece 3. The drawer member 1 is pivotally movable about a pivot axis 1X.

According to the invention, this date mechanism 2 comprises, on the one hand, a 24-hour wheel 4 driven by the movement of timepiece 3, and, on the other hand, a finger 5 for updating the date. The finger 5 is mounted to pivot about a pivot axis 5X integrally with the 24 hour wheel 4. The date mechanism 2 also comprises a date driving star wheel 6.

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

According to the invention, the correction star wheel 7 is arranged to mesh with the date driving star wheel 6 and can be permanently meshed therewith. The daily movement of the finger 5 for updating the date can only be transmitted to the date driving star wheel 6 via this correcting star wheel 7.

In a particular manner according to the invention, the corrector star-wheel 7 is arranged so as to be able to be uncoupled from the finger 5 by the uncoupling mechanism 8.

The uncoupling mechanism 8 is controlled by actuating the pull-out member 1, and the uncoupling mechanism 8 has at least two positions, including: at least a first coupling position, in which the corrector star-wheel 7 is arranged to engage with the finger 5 or at least interfere with the trajectory of the finger 5, since the finger 5 makes only one revolution within 24 hours; at least a second uncoupled position, in which the correction star wheel 7 is released from said finger 5, to allow the date to be corrected by pivoting of the correction star wheel 7, which causes pivoting of said date-driving star wheel 6.

Preferably, as can be seen in fig. 1 to 12, the uncoupling mechanism 8 has three positions, including a first coupling position and a third coupling position, on either side of the uncoupling position.

This uncoupling mechanism 8 comprises a relative movement member 9 of the pivot axis 7X of the corrector star-wheel 7 with respect to the pivot axis 5X of the finger 5, which is achieved by the movement of at least one of said axes 7X and/or 5X.

In a preferred embodiment, visible in fig. 1 to 18 and described in detail below, the relative movement means 9 comprise movement conversion means 10, which movement conversion means 10 convert a unidirectional movement applied to said actuation pull-out member 1 into two opposite pivoting movements of a first lever 11 pivotally mounted with respect to a pivoting axis 11X. This first lever 11 comprises a first abutment member 12, this first abutment member 12 being arranged to directly or indirectly control the relative movement of the pivot axis 7X of the correction star wheel 7 with respect to the pivot axis 5X of the finger 5. Advantageously, the movement of actuating the pull-out element 1 is linear.

In a third advantageous embodiment, visible in fig. 7 to 9, first abutment member 12 is formed by a first bearing surface 13 of first lever 11, which first bearing surface 13 is arranged to abut against a hub 51 integral with finger 5 to remove finger 5 from corrector star wheel 7, or, in a further variant embodiment, this first bearing surface 13 abuts against a hub 71 integral with corrector star wheel 7 to remove corrector star wheel 7 from finger 5.

In an advantageous embodiment, as in the example of the fourth embodiment shown in fig. 10 to 12, the first bearing surface 13 is a first elongated hole 14 arranged to receive and guide a hub 51 integral with finger 5, or, in other variant embodiments, the first elongated hole 14 is arranged to receive and guide a hub 71 integral with corrector star-wheel 7.

In a particular embodiment, the first abutment member 12 is arranged to cooperate with a complementary abutment member 15 comprised in the second rod 16. As shown in fig. 4 to 6, second lever 16 is arranged to abut, at a second bearing surface 17 comprised therein, a hub 51 integral with finger 5, in order to move finger 5 away from corrector star wheel 7. Alternatively, as shown in fig. 1 to 3, second lever 16 is arranged to abut against a hub 71 integral with correcting star wheel 7, so as to move correcting star wheel 7 away from finger 5.

In a particular embodiment, second bearing surface 17 is a second elongated hole provided in second lever 16 to receive and guide hub 51 integral with finger 5 or hub 71 integral with corrector star-wheel 7.

The part 10 can be made in various ways, which part 10 serves to convert a movement in one direction, which is applied to the actuating pull-out member 1, into two opposite pivoting movements of the first lever 11, which is pivotally mounted with respect to the pivot axis 11X. Preferably, the transition piece 10 comprises at least one cam 20 on the first edge 19 of the first lever 11. This cam 20 is arranged to cooperate with an abutment point 21 of the actuation pull-out member 1 and extends substantially radially with respect to the pivot axis 11X of the first lever 11.

The cam 20 comprises a first path 24 and a second path 25 on both sides of the return point 23, preferably on the same side of a radial line 22 originating from said pivot axis 11X and passing through said return point 23. These paths are set as: during the centripetal stroke of the abutment point of the actuation pull-out member 1 from the first path 24 through the return point 23 to the second path 25 or during the centrifugal stroke of the abutment point of the actuation pull-out member 1 from the second path 25 through the return point 23 to the first path 24, a pivoting movement is generated in the opposite direction of the first lever 11, wherein the pivoting direction of the first lever 11 is reversed at this return point 23.

The first pin 11 is preferably arranged to be directly or indirectly driven by a driving member 26 or an elastic return member 27, such as a spring or the like. Preferably, the elastic return member 27 is arranged to return the cam 20 to abutment against the abutment point 21 of the actuation pull-out member 1.

In a particularly economical embodiment as shown in fig. 1 to 12, the abutment point 21 of the actuating pull-out member 1 is formed by a first pin 28 which defines a circular rotational movement about the pivot axis 1X of the actuating pull-out member 1.

Advantageously, the actuating pull-out piece 1 is formed by the winding and time-setting pull-out pieces of the timepiece 3.

Preferably, the plate 29 (and particularly the additional plate) functions to support the entire mechanism 100. In some embodiments, as shown in fig. 1 to 9, the plate 29 comprises an elongated hole 31, the elongated hole 31 being arranged to receive and guide a hub 51 integral with the finger 5 or a hub 41 of the 24-hour wheel 4 (with which the finger 5 of the 24-hour wheel 4 pivots integrally), or a hub 71 integral with the corrector star wheel 7.

The elastic return means 27 are advantageously formed by a spring or jumper spring 30 fixed to said plate 29, which spring or jumper spring 30 has the tendency to push directly or more generally indirectly the corrector star-wheel 7 towards the finger 5 integral with the 24-hour wheel 4, so that the corrector star-wheel 7 abuts against the finger 5. In particular, the elastic return means 27 can be formed by several elements, such as springs, independent of each other but all contributing to the return of the finger 5 and the corrector star-wheel 7 towards each other.

According to an embodiment of the invention, the relative mobility between corrector star wheel 7 and finger 5 may be obtained from the mobility of pivot axis 7X of corrector star wheel 7 when pivot axis 5X of finger 5 is fixed, or from the mobility of pivot axis 5X of finger 5 when pivot axis 7X of corrector star wheel 7 is fixed, or from the mobility of pivot axis 7X of corrector star wheel 7 and from the mobility of pivot axis 5X of finger 5.

Fig. 1 to 18 show 5 embodiments according to this principle.

Fig. 1 to 3 show the first embodiment, and show a case where the pivot axis 5X of the finger 5 is fixed to correct the movement of the pivot axis 7X of the star wheel 7.

Downstream of the pull-out member 1 actuated by the user, the uncoupling mechanism 8 comprises: a first link 11 pivotally movable about a pivot axis 11X; a second lever 16 which is pivotally movable about a pivot axis 16X and acts directly on the correction star wheel 7.

The pivoting axis 7X of the corrector star-wheel 7 moves, via a pin mounted on its hub 71 or preferably via said hub 71 itself, in an elongated hole 31, which elongated hole 31 is provided in the plate 29 and defines the end positions 131 and 231 between which the corrector star-wheel 7 can move.

The movement of the correction star wheel 7 in the elongated hole 31 is provided via a second lever 16, which second lever 16 comprises a hole 32 cooperating with a hub 71 of the correction star wheel 7 or with a pin integral with the hub 71. This elongated hole 31 preferably extends in a direction substantially perpendicular to the axis 7X connecting the axis 6X of the date driving star wheel 6 to the correction star wheel 7 and substantially radially with respect to the pivot axis 4X of the 24-hour wheel 4, which tends to move the hub 71 of the correction star wheel 7 substantially radially with respect to the finger 5. Preferably, the pivot axis 16X of the second lever 16 is close to the pivot axis 6X about which the date driving star wheel 6 pivots, and is preferably common to said pivot axis 6X, this date driving star wheel 6 being preferably held by a jumper spring 33.

The source of movement for controlling the uncoupling is provided by the actuation of the pull-out member 1. In the example in the figure, the pull-out part 1 is actuated by a pull-out part arm 34 and is pivotally movable about a pull-out part axis 1X, thereby controlling the pivotal movement of the first lever 11. The pull-out part 1 comprises two abutment points, preferably made in the form of pins:

a first abutment point 21, made in the example of the figures in the form of a first pin 28, this first pin 28 being arranged to abut against the first edge 19 of the first stem 11, or against the first path 24, which is preferably substantially straight or slightly curved, or against the second path 25 forming the slot, or against a return point 23 located between said first path 24 and said second path 25;

a second pull-out pin 36 arranged to cooperate with one of the notches 37A, 37B, 37C comprised in the edge of a pull-out member spring arm 37 fixed to the plate 29.

The pull-out member 1 (and therefore the first lever 11) occupies three positions shown in succession in figures 1 to 3.

The first and third coupling positions of the first lever 11 have the so-called normal position, i.e. the coupling position, and the corrector star wheel 7 abuts on the finger 5. These two positions are located on either side of a second position of first lever 11, called the uncoupling position, in which correcting star wheel 7 is released from finger 5 thus making it possible to correct the date, this being achieved by a wheel integral with correcting star wheel 7 and manually operated by a correcting train connected to stem 60.

Fig. 1 shows a first position of the pull-out part, in which the crown connected to the pull-out part 1 is pushed in. The pull-out 1 is held in place by its second pin 36 engaging with a first notch 37A of a pull-out spring arm 37. The first pin 28 of the pull-out member 1 abuts the first edge 19 of the first pin 11. The first lever 11 is pressed towards the first pin 28, since the first lever 11 is subjected to a torque exerted by the spring 30: as shown in fig. 1, this spring 30 applies a torque to the corrector star wheel 7 which has a tendency to drive the hole 32 of the second lever 16 in a clockwise direction with respect to the pivot axis 16X.

As a result, the second lever 16 tends to pivot clockwise and therefore presses a first bearing surface 38 (located on the opposite side of the hole 16C with respect to the axis 16X) comprised in the second lever 16 towards a complementary bearing surface 39 comprised in a second edge 40 (opposite the first edge 19 of the first lever 11) of the first lever 11. The second lever 16 therefore has a tendency to turn the first lever 11 in the anticlockwise direction and therefore the first lever 11 abuts on the first pin 28. This first pin 28 therefore limits the angular travel of the first lever 11 and therefore the corrector star-wheel 7 remains in abutment on the finger 5. Preferably, both the first edge 19 and the second edge 40 are substantially straight, or slightly curved, and are distanced from each other with increasing radius with respect to the pivot axis 11X of the first lever 11.

The pivot axis 16X of the second lever 16 is located substantially between the pivot axis 11X of the first lever 11 and the pivot axis 7X of the correcting star wheel 7. On either side of its pivot axis 16X, the second lever 16 comprises two arms: a first arm 42 carrying the first bearing surface 38; and a further second arm 43 carrying the hole 32, the two arms 42 and 43 being located on the same side with respect to the pivot axis 5X of the finger 5. The hub portion 71 of the correcting star wheel 7 abuts against the first end 131 of the elongated hole 31 in the machine plate.

Fig. 2 shows a second uncoupled position. The pull-out member arm portion 34 is in the intermediate date correcting position. The pulling of the pull-out part 1 causes the second pin 36 to turn onto the second notch 37B of the pull-out part spring arm 37. The moment exerted by said spring arm 37 at this position is greater than the moment exerted indirectly by the spring 30 on the first lever 11, and the first pin 28 remains in abutment on an end of the first path 24 closer to the pivot axis 11X of the first lever 11 (this end being located on the return point 23 of the cam 20 formed by the first edge 19 of the first lever 11).

The pulling of the pull-out member 1 tends to pivot the first lever 11 clockwise, pushing back the first bearing surface 38 of the second lever 16 and causing said second lever 16 to rotate anticlockwise. As a result, the hole 32 of the second lever 16 drives the hub 71 of the correction star wheel 7 towards the second end 231 of the elongated hole 31 in the plate 29, the hub 71 moving through a sufficiently large angle to move out of reach of the finger 5 and thus to be released from the finger 5. Therefore, in order to correct the display of the date, the correcting star wheel 7 can be operated forward and backward.

Fig. 3 shows a third position of the pull-out part, in which the crown connected to the pull-out part 1 is in a maximally stretched position. After the first path 24 and the return point 23 and on the side of the pivot axis 11X, the first lever 11 comprises a second path 25, this second path 25 being in the form of a groove set back from the first path 24, i.e. a groove recessed on the side of the complementary bearing surface 39 at the second edge 40 of the first lever 11. The drawer member 1 is held by the second pin 36 abutting in the third notch 37C of the drawer member spring arm 37.

The pulling of the pull-out member 1 causes the first pin 28 to enter the slot of the second path 25 and thus allows the first lever 11 to rotate again in the counterclockwise direction. The second lever 16 pivots in the clockwise direction and causes the correction star wheel 7 to return to the new angular position of engagement with finger 5 after the date has been set, since the hub 71 of correction star wheel 7 abuts on the first end 131 of the elongated hole 31 in the plate.

Thus, when using the pull-out part of the timepiece time setting mechanism, it is possible to set the time in said pulled-out position of the pull-out part 1 and the associated crown. The timepiece is then returned to the normal position by pushing the crown into the first position of the pull-out member 1.

In short, in this first embodiment, the pivoting axis 5X of the finger 5 is fixed, while the pivoting axis 7X of the corrector star-wheel 7 is movable.

Other embodiments show the case: the pivoting axis 5X of the finger 5 is movable, while the pivoting axis 7X of the correction star wheel 7 is fixed. The arrangement of the pull-out element 1 is the same in these three particular embodiments. However, the pivot axis 7X of the correction star wheel 7 is fixed with respect to the machine plate 29. As regards the mobility of the fingers 5, there are two possibilities: the finger 5 is movable (in particular in a radial direction) with respect to the 24 hour wheel 4, or the assembly formed by the 24 hour wheel 4 and the finger 5 is movable. This second alternative is shown in the following examples, but does not limit the invention.

A second embodiment is shown in fig. 4 to 6.

The pull-out member 1 is still engaged with the first pin 11. However, the arrangement of the first lever 11 is not the same as that of the first embodiment, and preferably the first path 24 and the second path 25 are substantially straight and approach each other with an increasing radius relative to the pivot axis 11X of the first lever 11.

Unlike the first embodiment, the pivot axis 7X of the correction star wheel 7 is substantially located between the pivot axis 11X of the first lever 11 and the pivot axis 16X of the second lever 16. The two arms of the second lever 16 (the first arm 42 and the second arm 43, respectively) are located on either side of the pivot axis 5X of the finger 5.

The second pin 16 is held in contact with the first pin 11 via a spring (not shown in the figures).

In this second embodiment, the hub 41 with the pivot axis 4X of the 24-hour wheel 4 is movable in an elongated hole 31 of the plate 29, which elongated hole 31 allows the 24-hour wheel 4 to move while still maintaining contact with the gear of the centre wheel of the movement (which drives the 24-hour wheel 4). This elongated hole 31 preferably extends substantially in the direction connecting pivot axis 4X of 24-hour wheel 4 to pivot axis 7X of corrector star wheel 7, which tends to move hub 41, and therefore finger 5, substantially radially with respect to corrector star wheel 7. A return member, such as a spring, not shown in the figures, tends to move the hub portion 41 away from the correcting star wheel 7 by pushing or pulling the hub portion 41 back to the end 231 of the elongated hole 31 that is furthest from the correcting star wheel 7.

On its first arm 42, the second bar 16 comprises a first bearing surface 38, the first bearing surface 38 cooperating with the first bar 11 in a similar way to the first embodiment. The lever 16 also includes a second bearing surface 44 on its second arm 43, the second bearing surface 44 pivoting angularly in the same direction as the first bearing surface 38, the two bearing surfaces being on the same side of the pivot axis 16X. This second bearing surface 44 is opposite to the hub 41 comprised in the 24-hour wheel 4 and is kept at a distance from the hub 41 during normal operation to avoid unnecessarily braking the movement. The 24-hour wheel 4 is still in mesh with the centre wheel of the movement, irrespective of the position of its pivot axis 4X or of the hub 41 contained therein with respect to the elongated hole 31 in the plate 29.

Fig. 4 shows a first pushed-in position of the pull-out part 1, which pull-out part 1 is held in place by the second pin 36 of the pull-out part engaging with the first recess 37A of the pull-out part spring arm 37. The first pin 28 of the pull-out part abuts on the first path 24 of the first pin 11. The first lever 11 is pressed against the first pin 28 because the first lever 11 is subjected to a torque exerted by a spring (which presses the second lever 16 against the first lever 11): a torque is applied to the second lever 16 by said spring and tends to press the second bearing surface 44 comprised in the second arm 43 of the second lever 16 against the hub 41 of the 24-hour wheel 4, pushing said hub 41 towards the first end 131 of said elongated hole 31 on the side of the corrector star-wheel 7 and therefore tending to push the finger 5 into engagement with the corrector star-wheel 7. The finger 5 is therefore unable to drive the correcting star wheel 7 via the second lever 16 (this second lever 16 being held in contact with the first lever 11 via a spring).

Fig. 5 shows a second uncoupled position. The pull-out member arm portion 34 is in the intermediate date correcting position. The pulling of the pull-out part 1 causes the second pin 36 to turn onto the second notch 37B of the pull-out part spring arm 37. The moment exerted by said spring arms is greater than the moment exerted indirectly by the spring which pushes the second rod 16 towards the first rod 11, and the first pin 28 abuts at the return point 23. The pulling of the pull-out member 1 therefore tends to pivot the first lever 11, pushing back the first bearing surface 38 of the second lever 16, and causing the second lever 16 to rotate in the counterclockwise direction.

As a result, the second bearing surface 44 (which is contained in the second arm 43 of the second lever 16) pivots and causes the hub 41 of the 24-hour wheel 4 (which tends to move away from the corrector star-wheel 7 by a return spring, not shown in the figures) to move in the elongated hole 31, on the opposite side to the corrector star-wheel 7, along a sufficiently long stroke to disengage the corrector star-wheel 7, reaching the second end of the hole 31 (the position shown in fig. 5). Therefore, in order to correct the display of the date, the correcting star wheel 7 can be operated forward and backward.

The advantage is that the 24-hour wheel 4 returns to the same position after correction without losing its load.

Fig. 6 shows a third position of the pull-out part 1, in which the crown connected to the pull-out part 1 is in the maximum stretched position, the pull-out part 1 being held by the abutment of the second pin 36 in the third notch 37C of the pull-out part spring arm 37. The pulling of the pull-out member 1 causes the first pin 28 to move into the slot of the second path 25. This movement thus causes the first lever 11 to rotate again in the counterclockwise direction. Second lever 16 pivots clockwise and returns second bearing surface 44 (which is contained in second arm 43 of second lever 16) to hub 41 of 24-hour wheel 4 and brings hub 41 into abutment with first end 131 of hole 31, thus tending to push finger 5 into engagement with corrector star wheel 7. The finger 5 is therefore not prevented from being driven by the corrector star-wheel 7.

A third embodiment is shown in fig. 7 to 9. In this embodiment, the combination of the first lever 11 and the second lever 16 is replaced by a single first lever 11, wherein the single first lever 11 comprises a first arm 46 and a second arm 47 on the same side of its pivot axis 11X (which is preferably located at one end of the first lever 11). The first lever 11 is kept in contact with the pull-out member 1 via a return member which tends to pivot said lever in the anticlockwise direction. The return member is applied to the driving point 48 of the first pin 11. The return member may be formed by a spring, not shown in the figures, or by an intermediate rod in turn comprising a spring, as shown in another fifth embodiment in fig. 13 to 15, or by other elements.

As in the second embodiment, the pivot axis 4X of the 24-hour wheel 4 is movable in an elongated hole 31 of the plate 29, which allows the 24-hour wheel 4 to move while also maintaining contact with the gear of the centre wheel of the movement (which drives the 24-hour wheel 4). This elongated hole 31 preferably extends substantially in the direction connecting pivot axis 4X of 24-hour wheel 4 to pivot axis 7X of corrector star wheel 7, which tends to move hub 41, and therefore finger 5, substantially radially with respect to corrector star wheel 7. The movement of the pull-out element 1 and the cooperation of the second pin 36 with the recesses 37A, 37B, 37C of the pull-out element spring arm 37 in different positions is similar to the other embodiments.

Fig. 7 shows a first position of the pull-out part, in which the pull-out part 1 is pushed in. The pull-out 1 is held in place by its second pin 36 engaging with a first notch 37A (not shown in this figure) of a pull-out spring arm 37. The first pin 28 abuts the first edge 19 on the first arm 46 at the first path 24. This position of first lever 11 causes second bearing surface 50 comprised in second arm 47 to rest on hub 41 of 24-hour wheel 4, so as to retain this hub 41 at first end 131 of elongated hole 31 on the side of corrector star-wheel 7 and, consequently, to cause finger 5 to engage with corrector star-wheel 7.

Fig. 8 shows a second uncoupled position. The pull-out member arm portion 34 is in the intermediate date correcting position. Pulling of the pull-out member 1 causes the second pin 36 to turn onto the second notch 37B (not shown in this figure) of the pull-out member spring arm 37. In this position the moment exerted by said spring arm 37 is greater than the moment exerted indirectly by the return member which pushes back the first stem 11 towards the pull-out member 1, and the first pin 28 remains in abutment at the return point 23. The pulling of the pull-out member 1 therefore tends to cause the first lever 11 to pivot, pushing back the second bearing surface 50 of the second arm 47, away from the corrector star-wheel 7. As a result, hub 41 of 24-hour wheel 4 (which tends to move away from correcting star wheel 7 by a return spring not shown in the figures) can move in elongated hole 31 on the side opposite to correcting star wheel 7 by a sufficiently long stroke to disengage from correcting star wheel 7, reaching the position shown in fig. 8 at second end 231 of elongated hole 31. Therefore, in order to correct the display of the date, the correcting star wheel 7 can be operated forward and backward.

Fig. 9 shows a third position of the pull-out part 1, which is the maximum stretched position of the crown connected to the pull-out part 1, the pull-out part 1 being held by abutment of the second pin 36 with the third notch 37C of the pull-out part spring arm 37. The pulling of the pull-out member 1 causes the first pin 28 to move into the slot of the second path 25. As a result, this movement allows the first lever 11 to rotate in the opposite direction, which causes the second bearing surface 50 of the second arm 47 to return to abutment on the hub 41 of the 24-hour wheel 4, pushing the hub 41 back to the first end 131 of the elongated hole 31 closest to the corrector star-wheel 7, thus tending to push the finger 5 into engagement with the corrector star-wheel 7. The finger 5 is therefore not prevented from being driven by the corrector star-wheel 7.

A fourth embodiment is shown in fig. 10 to 12. As in the third embodiment, the combination of the first lever 11 and the second lever 16 is replaced by a single first lever 11, wherein the single first lever 11 comprises a first arm 46 and a second arm 47 on the same side of its pivot axis 11X (which is preferably located at one end of the lever 11). The first lever 11 is kept in contact with the pull-out member 1 via a return member which tends to pivot said lever in the anticlockwise direction. The return member is applied to the driving point 48 of the first pin 11. The return member may be formed by a spring (not shown in the figures), or by an intermediate rod which in turn comprises a spring, or by another element.

The pivot axis 4X of the 24-hour wheel 4 is movable in an elongated hole 31 in the plate 29 and also in a first elongated hole 14 provided in the second arm 47 of the first lever 11, in a similar manner to the second and third embodiments described above, wherein said elongated hole 31 allows the 24-hour wheel 4 to move while still maintaining contact with the gear of the centre wheel of the movement (which drives the 24-hour wheel 4). The first elongated hole 14 extends in a direction inclined with respect to the direction of the elongated hole 31 in the machine plate 29. Any substantially tangential movement of the second arm 47 with respect to the correcting star wheel 7 drives the hub 41 substantially radially with respect to the correcting star wheel 7. The movement of the pull-out element 1 and the cooperation of the second pin 36 with the recesses 37A, 37B, 37C of the pull-out element spring arm 37 in different positions is similar to the other embodiments.

Fig. 10 shows a first position of the pull-out part, in which the pull-out part 1 is pushed in. The pull-out 1 is held in place by its second pin 36 engaging with a first notch 37A of a pull-out spring arm 37 not shown in this figure. The first pin 28 abuts the first edge 19 on the first arm 46 at the first path 24. This position of the first lever 11 tends to pivot said lever and to pull the second arm 47 by forcing the hub 41 of the 24-hour wheel 4 to occupy a first retaining position at the first end 114 of the first elongated hole 14 and the first end 131 of the elongated hole 31 (in a position in which the finger 5 can engage with the correcting star wheel 7).

Fig. 11 shows a second uncoupled position. The pull-out member arm portion 34 is in the intermediate date correcting position. Pulling of the pull-out member 1 causes the second pin 36 to turn onto the second notch 37B (not shown in this figure) of the pull-out member spring arm 37. In this position the moment exerted by said spring arm 37 is greater than the moment exerted indirectly by the return member which pushes back the first stem 11 towards the pull-out member 1, and the first pin 28 remains in abutment at the return point 23. This position of the first lever 11 tends to cause the first lever 11 to pivot and tends to push the second arm 47 by forcing the hub 41 of the 24-hour wheel 4 to occupy a second retaining position (in a position in which the finger 5 is disengaged from the correcting star wheel 7) at the second end 214 of the first elongated hole 14 and at the second end 231 of the elongated hole 31.

Fig. 12 shows a third position of the pull-out part, which is the maximum stretched position of the crown connected to the pull-out part 1, the pull-out part 1 being held by abutment of the second pin 36 with the third notch 37C of the pull-out part spring arm 37. The pulling of the pull-out member 1 causes the first pin 28 to move into the slot of the second path 25. As a result, this movement allows the first lever 11 to rotate in the opposite direction, which causes the second arm 47 to return to the pulling condition, forcing the hub 41 of the 24-hour wheel 4 to occupy the first retaining position at the first end 114 of the first elongated hole 14 and the first end 131 of the elongated hole 31, i.e. in a position in which the finger 5 can engage with the corrector star-wheel 7.

The invention also relates to a date mechanism 2, which date mechanism 2 comprises a date-driving star wheel 6 and a 24-hour wheel 4 with a date-updating finger 5, and is provided with a bidirectional date correction mechanism 100 of this type.

The invention also relates to a timepiece 3, this timepiece 3 comprising a date mechanism 2 as follows: the date mechanism 2 comprises a date driving star wheel 6 and a 24-hour wheel 4 with a date updating finger 5, and is provided with a bidirectional date correction mechanism 100 of this type.

Fig. 13 to 15 show a timepiece 3 including a date correction mechanism 100 of a fifth embodiment evolved from the fourth embodiment. The movement is transmitted to the hub 51 of the finger 5 via the first lever 11, wherein this first lever 11 comprises the second arm 47 with the hole 14 provided as in the fourth embodiment shown in figures 10 to 12. The first pin 11 differs from the fourth embodiment in that: this first lever 11 does not comprise directly on its first arm 46 a first edge provided with a cam 9. The uncoupling mechanism uses a control lever 52 which control lever 52 comprises a spring 53 tending to push said lever back towards the pull-out member 1 and, on the opposite side of said pull-out member, an edge 19 of this type provided with a cam 20, which cam 20 comprises a first path and a second path separated by a return point, as previously described. The control link 52 cooperates with the pull-out part 1 and the pull-out part spring arm 37 in the same way as in the 4 other embodiments described above.

The relative movement component 9 of the pivot axis 7X of the correction star wheel 7 with respect to the pivot axis 5X of the finger 5 is formed by the movement conversion component 10 at this time, here more specifically by the control lever and the pull-out component 1 on the one hand, and by the first lever 11 (which first lever 11 is driven by the control lever at its return point 48) on the other hand.

Fig. 13 to 15 also show a variant applicable to all the other embodiments, in which finger 5 is not directly engaged with correcting star wheel 7 (which is engaged with date-driving star wheel 6), but with a coaxial star wheel 7A, which coaxial star wheel 7A is pivoted integrally with said correcting star wheel 7.

Fig. 14 and 15 show the train between the stem 60 and the correction gear 70, and the complete drive chain as far as the central wheel.

A fifth embodiment of the kinematic chain is illustrated in figures 16 to 18, which show the elastic return member 27 of the corrector star-wheel 7 in the form of a jumper spring 30. The lever 52 is shown with its spring 53, which spring 53 cooperates with the stop member 27A seen in fig. 15. This spring, which is associated with the pivot axis 54 for the transmission between the first lever 11 and the control lever 52, is able to hold the latter or to elastically return it to the position shown in fig. 16.

Fig. 19 shows a variant 55 of the finger 5 integral with the 24-hour wheel 4, which is suitable for the various embodiments described above. Finger 55 is a resilient finger, preferably in the form of a circular sector. It comprises a bearing surface 55 intended to cooperate with the corrector star-wheel 7 and extending at the end of a peripheral spring arm 57. The arm 57 also comprises a recessed stop surface 59, which stop surface 59 is arranged to cooperate as a tip of travel limit with a stop member 58 mounted on the 24-hour wheel 4.

The advantage of this variant is that, when necessary, the corrective action can be performed in the opposite direction, without damaging the mechanism: during the return movement, the end of the bearing surface 55 can be moved substantially radially aside with respect to the corrector star-wheel 7 by bending the spring arm 57.

On the basis of the modified finger 5 given above, the mechanism is wound between said fixed finger and the jumper spring 30 of the corrector star-wheel 7. In this variant of finger spring 55, the winding is progressive and balanced between this spring 57 and jumper spring 30 of corrector star-wheel 7. This arrangement enables more energy to be accumulated for a longer time.

Claims (17)

1. A bidirectional date correction mechanism (100) for a date mechanism (2) of a timepiece (3), said bidirectional date correction mechanism (100) being controlled by an actuating pull-out member (1) pivotally mounted about a first pivot axis (1X), said date mechanism (2) comprising a 24-hour wheel (4) driven by the movement of said timepiece (3), a date updating finger (5) mounted so as to pivot integrally with said 24-hour wheel (4) about a second pivot axis (5X), and a date-driving star wheel (6), said correction mechanism (100) comprising a correction star wheel (7), said correction star-wheel (7) being pivotally movable about a third pivot axis (7X) and being located between said finger (5) and said date driving star-wheel (6), characterized in that said correction star wheel (7) is arranged in engagement with said date driving star wheel (6); -said correction star wheel (7) being arranged to be uncoupled from said finger (5) under the action of a uncoupling mechanism (8) controlled by said pull-out member (1), said uncoupling mechanism (8) having at least two positions, including at least one first coupling position in which said correction star wheel (7) is arranged to engage with said finger (5), and at least one second uncoupling position in which said correction star wheel (7) is released from said finger (5), so that the date can be corrected by pivoting of said correction star wheel (7) which causes pivoting of said date driving star wheel (6).

2. A two-way date correction mechanism (100) according to claim 1, characterized in that the uncoupling mechanism (8) has three positions, including a first coupling position and a third coupling position, which are located on either side of the second uncoupling position.

3. The bidirectional date correction mechanism (100) of claim 1, characterized in that the decoupling mechanism (8) includes a relatively moving part (9), the relatively moving part (9) effecting movement of the third pivot axis (7X) of the correcting star wheel (7) relative to the second pivot axis (5X) of the finger (5) by moving at least one of the third pivot axis (7X) and the second pivot axis (5X).

4. A bidirectional date correction mechanism (100) according to claim 3, characterized in that the relative movement member (9) comprises a conversion member (10), the conversion member (10) converting a movement in one direction applied to the actuating pull-out member (1) into two pivotal movements in the opposite direction with respect to a first lever (11) pivotally mounted with respect to a fourth pivot axis (11X), the first lever (11) comprising a first abutment member (12), the first abutment member (12) being arranged to directly or indirectly control the relative movement of the third pivot axis (7X) of the correcting star wheel (7) with respect to the second pivot axis (5X) of the finger (5).

5. The mechanism (100) of the bidirectional date corrector according to claim 4, characterized in that said first abutment member (12) is formed by a first bearing surface (13) of said first lever (11), said first bearing surface (13) being arranged to abut against a hub (51) integral with said finger (5) in order to remove said finger (5) from said corrector star-wheel (7), or against a hub (71) integral with said corrector star-wheel (7) in order to remove said corrector star-wheel (7) from said finger (5).

6. A bidirectional date correction mechanism (100) according to claim 5, characterized in that the first bearing surface (13) is a first elongated hole (14), the first elongated hole (14) being arranged to receive and guide the hub (51) integral with the finger (5) or the hub (71) integral with the corrector star-wheel (7).

7. The mechanism (100) of the two-way date corrector according to claim 4, characterized in that said first abutment member (12) is arranged to cooperate with a complementary abutment member (15) comprised in a second lever (16), said second lever (16) being arranged to abut, on a second bearing surface (17) comprised therein, with a hub (51) integral with said finger (5) in order to remove said finger (5) from said corrector star-wheel (7) or with a hub (71) integral with said corrector star-wheel (7) in order to remove said corrector star-wheel (7) from said finger (5).

8. A bidirectional date correction mechanism (100) according to claim 7, characterized in that the second bearing surface (17) is a second elongated hole arranged to receive and guide the hub (51) integral with the finger (5) or the hub (71) integral with the correcting star wheel (7).

9. The bidirectional date correction mechanism (100) of claim 4, characterized in that the conversion means (10) which convert a movement applied to the actuation pull-out member (1) in one direction into two opposite pivoting movements of a first lever (11) pivotally mounted with respect to a fourth pivot axis (11X) comprise, on a first edge (19) of the first lever (11), at least one cam (20), which cam (20) is arranged to cooperate with an abutment point (21) of the actuation pull-out member (1) and extends substantially radially with respect to the fourth pivot axis (11X), which cam (20) comprises a first path (24) and a second path (25) on the same side of a radial line originating from the fourth pivot axis (11X) and passing through a return point (23) and on both sides of the return point (23), the first path (24) and the second path (25) are arranged to produce a pivoting movement in opposite directions of the first lever (11) during a centripetal stroke of the abutment point of the actuation pull-out member (1) from the first path (24) through the return point (23) to the second path (25) and during a centrifugal stroke of the abutment point of the actuation pull-out member (1) from the second path (25) through the return point (23) to the first path (24), respectively, wherein the pivoting direction of the first lever (11) is reversed at the return point (23).

10. A bidirectional date correction mechanism (100) according to claim 4, characterized in that the first lever (11) is driven by a driving member (26) or by an elastic return member (27).

11. A bidirectional date correction mechanism (100) according to claim 9, characterized in that the first lever (11) is driven by a driving member (26) or by an elastic return member (27); wherein the elastic return means (27) are arranged to return the cam (20) to abutment on the abutment point (21) of the actuation pull-out member (1).

12. The bidirectional date correction mechanism (100) of claim 9, characterized in that the abutment point (21) of the actuation pull-out member (1) is formed by a first pin (28), the first pin (28) defining a circular rotational movement about the first pivot axis (1X) of the actuation pull-out member (1).

13. A bidirectional date correction mechanism (100) according to claim 5, characterized in that the bidirectional date correction mechanism (100) comprises a plate (29), the plate (29) comprising an elongated hole (31) arranged to receive and guide the hub (51) integral with the finger (5) or the hub (71) integral with the correction star wheel (7).

14. A bidirectional date correction mechanism (100) according to claim 1, characterized in that the actuation pull-out part (1) is formed by a winding and time setting pull-out part of the timepiece (3).

15. The bidirectional date correction mechanism (100) of claim 1, characterized in that the finger (5) is formed by a finger spring (55) as an elastic finger, the finger spring comprising a bearing surface (55), the bearing surface (55) being arranged to cooperate with the correcting star wheel (7) and extending at the end of a peripheral spring arm (57), the peripheral spring arm (57) comprising a recessed stop surface (59), the stop surface (59) being arranged to cooperate as the end of travel limit with a stop member (58) mounted on the 24 hour wheel (4), the end of the bearing surface (55) being movable substantially radially with respect to the correcting star wheel (7) by bending the spring arm (57) upon actuation in the opposite direction.

16. A date mechanism (2), said date mechanism (2) comprising a date-driving star wheel (6) and a 24-hour wheel (4) with a date-updating finger (5), and being provided with a bidirectional date correction mechanism (100) according to claim 1.

17. Timepiece (3), the timepiece (3) comprising a date mechanism (2), the date mechanism (2) comprising a date-driving star wheel (6) and a 24-hour wheel (4) with date-updating dials (5), and being provided with a bidirectional date correction mechanism (100) according to claim 1.