Clock movement comprising a mechanism for correcting a display

Abstract

The invention relates to a watch movement comprising a control rod (1), a movement winding mechanism, a date display mechanism and a time display mechanism, the watch movement comprising a first rocker (10) carrying a drive wheel (11) capable of being kinematically linked to the control rod (1), and carrying at least one time-setting wheel (12) arranged to cooperate with the time display mechanism and capable of being kinematically linked to the drive wheel (11), and a second rocker (20) carrying a date correction mechanism capable of being kinematically linked to the drive wheel (11) as well as to the date display mechanism,the second rocker (20) being pivotally mounted on the first rocker (10) and arranged to move between an engagement position in which the date correction mechanism cooperates with the date display mechanism and a disengagement position in which the date correction mechanism is disconnected from the date display mechanism, and the control rod (1) and the first (10) and second (20) rockers are arranged to occupy three positions.

Description

Technical field of the invention

[0001] The invention relates to the field of mechanical watchmaking. It relates, more particularly, to a watch movement comprising a control stem, a movement winding mechanism, a date display mechanism and a time display mechanism.

[0002] More particularly, the invention relates to a mechanism for correcting the time and / or date. Technological background

[0003] Many mechanical watches traditionally include a control stem, located at 3 o'clock, which can occupy two positions, namely a manual winding position and a time-setting position. These watches may also include a date correction mechanism operated via this same control stem.

[0004] Patent EP 2 707 778 discloses a mechanism for correcting the date by means of the control stem, arranged to occupy a third position. However, in this mechanism, the date correcting organ is fixed and therefore in permanent mesh with the date ring and the date correction is carried out in both directions. The risk is of breaking a date drive arm if the user carries out a date correction around midnight.

[0005] Also known from patent EP 3 144 743 is a watch movement comprising a first lever carrying a first drive wheel capable of being kinematically connected to the control stem, a second lever carrying a second time-setting wheel arranged to cooperate with the time display mechanism and capable of being kinematically connected to the first drive wheel, and a third lever carrying a date correction mechanism capable of being kinematically connected to the first drive wheel as well as to the date display mechanism, the third lever being pivotally mounted on the second lever and arranged to move between a meshing position in which the date correction mechanism cooperates with the date display mechanism and a retracted position in which the date correction mechanism is disconnected from the date display mechanism,and the control rod and the first and second rockers are arranged to occupy three positions.,

[0006] However, in this mechanism, when the wearer makes a time correction, the wearer also changes the date. An involuntary change of the date is not necessarily desired by the wearer and the wearer must then correct the date after correcting the time.

[0007] Document FR2169861 A1 describes a delay device for a stem adjustment mechanism of a winder, intended to be used with a watch in which the stem of the winder can be selectively placed in several positions, the first of which allows correction of the day and date displayed and the second of which allows setting of the minutes. Summary of the invention

[0008] The invention aims in particular to overcome the various drawbacks of known mechanisms.

[0009] More specifically, an objective of the invention is to provide a watch movement allowing rapid correction of the time or date by the control stem.

[0010] To this end, the present invention relates to a watch movement comprising a control stem, a movement winding mechanism, a date display mechanism and a time display mechanism, the watch movement comprising a first lever carrying a drive wheel capable of being kinematically connected to the control stem, and carrying at least one time-setting wheel arranged to cooperate with the time display mechanism and capable of being kinematically connected to the drive wheel, and a second lever carrying a date correction mechanism capable of being kinematically connected to the drive wheel as well as to the date display mechanism,the second lever being pivotally mounted on the first lever and arranged to move between an engagement position in which the date correction mechanism cooperates with the date display mechanism and a retracted position in which the date correction mechanism is disconnected from the date display mechanism, and in that the control stem and the first and second levers are arranged to occupy three positions: , a winding position, in which the control stem is kinematically connected to the winding mechanism of the movement and is not kinematically connected to the drive wheel, a date correction position in which the control stem is kinematically connected to the drive wheel, and the first and second levers are positioned such that the first drive wheel is kinematically connected to the date correction mechanism and is not kinematically connected to the time display mechanism; and a time setting position in which the control stem is kinematically connected to the first drive wheel and the first and second levers are positioned such that the first drive wheel is kinematically connected to the time display mechanism via the at least one time setting wheel and is not kinematically connected to the date correction mechanism,

[0011] According to the invention, the watch movement comprises a third lever arranged to cooperate with the second lever, the third lever being arranged to lock the second lever in the time-setting position when the control stem is in the time-setting position and prevent the date from being corrected when the time is being corrected.

[0012] According to other advantageous variants of the invention: the second lever comprises means for limiting the angular travel; the means for limiting the angular travel comprise an opening formed in the second lever, the opening being arranged to cooperate with a pin, the ends of the opening defining the travel length of the second lever; the watch movement comprises a winding pinion, a sliding pinion, the positioning of the sliding pinion being ensured by a pull-out and a lever, the third lever comprising a bent guide groove which defines the angular position of the third lever according to the position in which the pull-out is immobilized; the third lever cooperates indirectly with a jumper via the pull-out, the jumper comprising a flexible arm having three notches forming three positions corresponding to the winding, date correction and time correction positions;the third lever has a first free end on which is mounted a pin arranged to rest against the second lever when the winding stem is in the time-setting position, and a second end comprising the guide groove cooperating with a pin secured to the pull-out; the pin is arranged in the guide groove to cause the third lever to tilt from its rest position to its time-setting position, so as to block the movement of the second lever at least in the direction of the date display mechanism, or to completely block the second lever; the second lever comprises friction means; the friction means are in the form of a washer.;

[0013] The invention also relates to a timepiece comprising a movement in accordance with the invention. Brief description of the figures

[0014] Other characteristics and advantages of the invention will appear on reading the following detailed description given by way of non-limiting example, with reference to the appended drawings in which: there figure 1 represents a perspective view from above of a mechanism for correcting a movement according to the invention; the figure 2 represents a perspective view from below of a mechanism for correcting a movement according to the invention; the figure 3 represents a partial top view of a watch movement according to the invention; the Figures 4a to 4d represent top views of a correction mechanism in different positions of a watch movement according to the invention; the Figure 5 is an exploded view of a correction mechanism of a watch movement according to the invention. Detailed description of the invention

[0015] In reference to the figure 3, it represents a part of a watch movement including in particular a control stem 1, a winding mechanism, a date correction mechanism and a time correction mechanism.

[0016] In a conventional manner, the control stem 1 or winding stem is operable from outside the watch case and is mobile in rotation about its axis of revolution C on the one hand and in translation along its axis of revolution C on the other hand to occupy its different positions. A winding pinion 2, a sliding pinion 4 are also provided, the positioning of the sliding pinion 4 being ensured by a pull 6 and a lever 8.

[0017] Conventionally, the winding pinion 2 meshes with the winding mechanism (not shown) to manually wind the movement when the control stem is in its winding position (generally its unpulled position) and the sliding pinion 4 cooperates with the winding pinion 2, as shown in the figure 1 .

[0018] The date display mechanism conventionally comprises a date disc or ring 3 having internal teeth 5 actuated by a date correction mechanism.

[0019] The time correction mechanism may include a set of gears meshing with a minute wheel which cooperates with a cannon pinion.

[0020] All these elements and their operations are known to those skilled in the art and do not require a more detailed description.

[0021] According to the invention, a first lever 10 is provided pivotally mounted on a plate and carrying a first drive wheel 11 mounted freely to rotate about an axis. The drive wheel 11 is capable of being meshed by the sliding pinion 4 of the control stem 1 when the control stem is in the date correction or time setting position (pulled out positions).

[0022] A second rocker 20 is also provided, pivotally mounted on the first rocker 10. With reference to the Figure 5 , the second lever 20 comprises a first portion 20a provided with a first hole for the passage of a first shaft A, constituting the pivot axis of the second lever 20 on the first lever 10. The second lever 20 also comprises a second portion 20b having a second hole for the passage of a second shaft B, constituting the pivot axis of the date correction means.

[0023] The second lever 20 carries a date correction mechanism capable of being kinematically linked to the drive wheel 11 as well as to the date ring 3. With particular reference to the figure 3 , the date correction mechanism comprises a correcting member 15 capable of being kinematically linked to the drive wheel 11 via a connecting pinion 16, the correcting member 15 comprising correction fingers 17 capable of cooperating with the toothing 5 of the date ring 3. The correcting member 15 is frictionally mounted via a friction washer 18 on the second lever 20 via the shaft B secured to the correcting member 15. The correcting member 15 and the connecting pinion 16 are secured, the assembly being mounted to move in rotation on the second lever 20.

[0024] In the example shown, the correction fingers 17 cooperate directly with the date disc 3 but it is obvious that gears or other intermediate mechanisms can be provided between the correction member 15 and the date display mechanism.

[0025] The second lever 20 is pivotally mounted on the first lever 10 and is arranged to move between a meshing position in which the date correction mechanism cooperates with the date ring 3 and a retracted position in which the date correction mechanism is disconnected from the date ring 3.

[0026] The second rocker 20 also comprises a stop element, the stop element being in the form of an opening 20c so that the second rocker circulates between the two stops defined by the ends of the opening 20c, the ends of the opening 20c thus making it possible to delimit the angular travel of the second rocker 20 and to define two distinct positions for the second rocker 20.

[0027] Furthermore, a pin (not shown in the figures) is provided on the plate, arranged to cooperate with the opening 20c of the second lever 20. The pin forms, in cooperation with the opening 20c, means for limiting the travel of the second lever 20 when the latter pivots. Thus, the meshed position between the corrector and the date ring is defined by the first end of the opening, when it comes into contact with the pin.

[0028] Contact between the pin and the second end of the opening defines the release position.

[0029] According to the invention, a third lever 30 is provided pivotally mounted on the plate and carrying a guide groove 34 arranged to cooperate with the pull-out piece 6. The third lever 30 is arranged to cooperate with the second lever 20 and block the latter when the winding stem is in the time-setting position and thus prevent the date from being corrected when the time is corrected. As can be seen in Figure 4b , the third lever has a first free end 31 on which is mounted a pin 32 arranged to rest against the second lever 20 when the winding stem 1 is in the time-setting position, and a second end 33 comprising the guide groove 34 cooperating with a pin 35 secured to the puller 6.

[0030] The guide groove 34 has a bent shape which makes it possible to define three angular positions of the lever corresponding to the winding, date correction and time correction positions of the control stem 1. According to the invention, the lever 30 cooperates indirectly with a jumper 9 via the puller 6. The jumper 9 comprises a flexible arm 90 having three notches 9a, 9b, 9c.

[0031] The pull-out piece 6 comprises a pin 36 which cooperates with one of the notches 9a, 9b, 9c depending on the position of the stem. The pull-out piece 6 also cooperates with the winding stem 1 by means of a pin 37 arranged to rest in a groove 38 of the winding stem 1. Thus, by pulling the winding stem 1, the pull-out piece 6 pivots and pushes the flexible arm 90 and the pin is positioned 36 is placed in one of the notches 9a, 9b, 9c depending on the position occupied by the winding stem 1. Such an arrangement makes it possible in particular to create “notches” for the different positions of the winding stem 1 and therefore to facilitate the identification of the position of the winding stem 1 by the wearer when he wishes to make a correction.

[0032] The operation of the movement according to the invention is as follows: in the manual winding position, as shown in the Figure 4a, the sliding pinion 4 meshes with the winding pinion 2 which meshes with the winding mechanism (not shown) to manually wind the movement. Thus, the control stem 1 occupying its winding position is kinematically linked to the winding mechanism of the movement and is not kinematically linked to the drive wheel 11, nor consequently to the other time or date correction mechanisms.

[0033] In reference to the figure 4d, when the control stem 1 is pulled into its date correction position, the sliding pinion 4 translates towards the drive wheel 11 and then meshes with it. The third lever 30 is also moved when the control stem 1 is pulled and allows the second lever 20 to pivot into the date correction position. In this date correction position, the control stem 1 is therefore kinematically linked to the drive wheel 11 and the first 10 and second 20 levers are positioned so that the first drive wheel 11 is kinematically linked to the date correction mechanism carried by the second lever 20 and is not kinematically linked to the minute wheel. More precisely, the second lever 20 is positioned so that the drive wheel 11 meshes with the connecting pinion 16 carried by the second lever 20.The connecting pinion 16, integral with the correcting member 15, then drives the latter and the friction washer 18 in rotation so as to pivot the second lever 20 and then one of the correction fingers 17 cooperates with a tooth 5 of the date ring 3 and actuates the latter to correct the date. The first lever 10 is positioned so that the drive wheel 11 does not cooperate with the minute track. Thus, the rapid date correction function is isolated from the time-setting and winding functions.

[0034] In this position, the rotation of the control stem 1 in one direction causes the rotation of the connecting pinion 16 and the friction washer 18 in one direction, and therefore the pivoting of the second lever 20 in the same direction, this pivoting direction for example bringing the correcting member 15 towards the date ring 5, as shown in the figure 4dThe third lever 30 then occupies its date correction position and it is then possible to proceed with the date correction.

[0035] When the control stem 1 is turned in the opposite direction, this causes the connecting pinion and the axis B to rotate in the opposite direction, and therefore the second lever 20 to pivot in the same opposite direction, this opposite direction of pivoting moving the date correction mechanism away from the date ring 5, as shown in the figure. Figure 4c The movement of the date correction mechanism of the date ring 5 is limited by the cooperation of the pin with the ends of the opening 20c provided in the second lever 20. Thus, the mechanism according to the invention allows a unidirectional correction of the date by means of the control stem. The correction of another function can be envisaged when the control stem is turned in the opposite direction.

[0036] In reference to the Figure 4b, when the control stem 1 is pulled into its time-setting position, the sliding pinion 4 performs a translation in the direction of the first lever 10. The control stem 1 then cooperates with the first lever 10 so that the latter pivots so that the drive wheel 11 meshes with the time-setting wheels 12, the sliding pinion 4 remaining meshed with the first drive wheel 11. In this time-setting position, the control stem 1 is therefore kinematically linked to the drive wheel 11 and the first lever is positioned so that the first drive wheel 11 and the time-setting wheels 12 allow the time to be set.More precisely, during the translation of the control stem 1, the pull-out acts on the third lever 30 and moves it into the position for locking the second lever 20, the cooperation of the pin 35 in the guide groove 34 causes the third lever 30 to tilt, which moves from its rest position to its time-setting position, so as to block the movement of the second lever, at least in the direction of the date, or even completely block the lever from moving in the direction of the date ring. Thus, the time-setting function is isolated from the rapid date correction and winding functions.

[0037] In the movement according to the invention, the meshing between the first drive wheel and the date display or time setting mechanisms is not permanent, so that the teeth of the different parts do not require specific cutting.

[0038] The invention also relates to a timepiece comprising a watch movement according to the invention.

[0039] Of course, the present invention is not limited to the illustrated example and is susceptible to various variants and modifications which will appear to those skilled in the art, without departing from the scope of the invention as defined by the claims.

Claims

1. Horological movement comprising a setting stem (1), a movement winding mechanism, a date display mechanism (3) and a time display mechanism, the horological movement comprising a first lever (10) carrying a drive wheel (11) capable of being kinematically connected to the setting stem (1), and carrying at least one hand-setting wheel (12) arranged to cooperate with the time display mechanism and capable of being kinematically connected to the drive wheel (11), and a second lever (20) carrying a date correction mechanism capable of being kinematically connected to the drive wheel (11) and to the date display mechanism (3), the second lever (20) being pivotably mounted on the first lever (10) and arranged to move between a meshed position in which the date correction mechanism cooperates with the date display mechanism and a retracted position in which the date correction mechanism is disconnected from the date display mechanism, and in that the setting stem (1) and the first lever (10) and second lever (20) are arranged to occupy three positions: - a winding position, in which the setting stem (1) is kinematically connected to the movement winding mechanism and is not kinematically connected to the drive wheel (11), - a date correction position in which the setting stem (1) is kinematically connected to the drive wheel (11), and the first lever (10) and second lever (20) are positioned so that the first drive wheel (11) is kinematically connected to the date correction mechanism and is not kinematically connected to the time display mechanism, - and a hand-setting position in which the setting stem (1) is kinematically connected to the first drive wheel (11) and the first lever (10) and second lever (20) are positioned so that the first drive wheel (11) is kinematically connected to the time display mechanism via the at least one hand-setting wheel (12) and is not kinematically connected to the date correction mechanism, characterised in that the horological movement comprises a third lever (30) arranged to cooperate with the second lever (20), the third lever (30) being arranged to block the second lever (20) in the hand-setting position when the setting stem (1) is in the hand-setting position and to prevent the date from being corrected while the time is being corrected.

2. Horological movement according to claim 1, characterised in that the second lever (20) comprises means for limiting the angular stroke.

3. Horological movement according to claim 2, wherein the means for limiting the angular stroke comprise an aperture (20c) formed in the second lever (20), the aperture being arranged to cooperate with a pin, the ends of the aperture defining the stroke length of the second lever (20).

4. Horological movement according to one of claims 1 to 3, characterised in that it comprises a winding pinion (2), a sliding pinion (4), the positioning of the sliding pinion (4) being ensured by a pull-out piece (6) and a lever (8), the third lever (30) comprising a bent guide groove (34) which defines the angular position of the third lever (30) according to the position in which the pull-out piece (6) is immobilised.

5. Horological movement according to claim 4, wherein the third lever (30) cooperates indirectly with a jumper (9) via the pull-out piece (6), the jumper (9) comprising a flexible arm (90) having three notches (9a, 9b, 9c) forming three positions corresponding to the winding, date correction and time correction positions.

6. Horological movement according to claim 4, wherein the third lever (30) has a first free end (31) on which is mounted a pin (32) arranged to rest against the second lever (20) when the winding stem (1) is in the hand-setting position, and a second end (33) comprising the guide groove (34) cooperating with a pin (35) secured to the pull-out piece (6).

7. Horological movement according to claim 6, wherein the pin (35) is arranged in the guide groove (34) to cause the third lever (30) to tilt from its rest position into its hand-setting position, so as to block the displacement of the second lever (20) at least towards the date display mechanism (3), or to block the second lever (20) entirely.

8. Horological movement according to one of claims 1 to 7, wherein the second lever comprises friction means.

9. Horological movement according to the previous claim, wherein the friction means take the form of a washer.

10. Timepiece comprising a horological movement according to one of claims 1 to 9.

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