Chronograph mechanism and timepiece movement comprising such a chronograph mechanism

Abstract

One aspect of the invention relates to a chronograph mechanism (10) for a watch movement (1) comprising a first counter wheel (21) integral with a first reset member (51), a second counter wheel (22) integral with a second reset member (52), not coplanar, the chronograph mechanism (10) comprising a reset mechanism (100) comprising: a first hammer (110) and a second hammer (120) configured on two levels; the first hammer (110) and the second hammer (120) being pivotable independently of each other; an elastic coupling member (116), provided between the first hammer (110) and the second hammer (120), comprising a first lug (116.1) bearing on a first support member (111) of the first hammer (110) and a second lug (116.2) supported on a second support member (112) of the second hammer (120) so as to constrain by elastic effect the second hammer (120) supported against a support surface (118) of the first hammer (110), so that the first hammer (110) is coupled in rotation with the second hammer (120) in the absence of a force applied on the second hammer (120) greater than a value predetermined by the stiffness of the elastic coupling member (116).

Description

Technical field of the invention

[0001] The present invention relates to a chronograph mechanism for a watch movement.

[0002] More specifically, the invention relates to a chronograph mechanism comprising a mechanism for resetting the chronograph counters.

[0003] The invention also relates to a timepiece comprising such a chronograph mechanism. Technological background

[0004] Chronograph mechanisms allow time to be measured on demand via several chronograph counters, for example minutes and seconds.

[0005] Chronograph mechanisms typically include a reset mechanism for resetting the chronograph counters, i.e., repositioning them in a reference position, so that time can be measured again on demand.

[0006] Typically, such a reset mechanism consists of a reset control that can be operated by the user, for example via a pusher or an actuation pin accessible from outside the case in which the watch movement is mounted.

[0007] The reset control cooperates directly, or indirectly via rocker switches, with one or more reset hammers which strike the reset cams carried by the various chronograph counters.

[0008] The return to zero of the chronograph counters, and associated hands, is achieved by the pressure of the hammers on the periphery of the reset cams generating sufficient driving torque to modify the position of the chronograph counters in question until they return to a reference position determined by the geometry of the hammers and the reset cam.

[0009] In existing chronograph mechanisms, the hammers are either manufactured as a single piece or formed from separate parts joined together by means of fastening. In this latter case, they share a common actuation control. An example of such an implementation is described in EP 2241945.

[0010] Adjusting the reset mechanisms is a complex and time-consuming process requiring skilled craftsmanship. To adjust such a mechanism, the seconds hammer must be brought into contact with the seconds reset cam in its reference position. Then, the tip of the minutes hammer must be filed so that the minutes reset cam is also in its reference position. This operation is lengthy and delicate and can only be performed by a specialized watchmaker.

[0011] One solution to overcome this restrictive adjustment is to use two superimposed hammers whose angular movement is synchronized, while allowing limited relative angular movement of one hammer compared to the other during reset. Such a solution is described in patent CH 220536. This approach allows both hammers to act simultaneously on their respective hearts and prevents the chronograph counter hands from shifting in the reference position.

[0012] However, with this solution, the overlapping hammers make contact with the reset cams with low energy because much of the actuation energy is absorbed by the return and damping spring, which exerts increasing resistance against the hammers' movements. Therefore, there is a risk that the chronograph counters will not be correctly reset with such a mechanism.

[0013] Therefore, there is a need to improve chronograph mechanisms and in particular the mechanisms for resetting the counters of such chronograph mechanisms. Summary of the invention

[0014] In this context, one of the objectives of the invention is to propose a chronograph mechanism that solves at least one of the problems raised previously.

[0015] One of the objectives of the invention is to provide a reset mechanism that offers a precise reset of the various chronograph counters.

[0016] One of the objectives of the invention is to provide a reliable and secure reset mechanism.

[0017] One of the objectives of the invention is to provide a solution to facilitate the assembly of a set of several superimposed and rotationally coupled hammers.

[0018] In this context, the invention relates to a chronograph mechanism for a watch movement comprising a first chronograph counter wheel integral with a first reset member, a second chronograph counter wheel integral with a second reset member, not coplanar with the first reset member, the chronograph mechanism comprising a reset mechanism including: a first hammer and a second hammer configured on two levels to cooperate respectively with the first and second reset members; the first and second hammers being pivotable independently of each other; an elastic coupling member, provided between the first and second hammers, having a first leg bearing on a first support member of the first hammer and a second leg bearing on a second support member of the second hammer so as to constrain by elastic effect the second hammer bearing on the first hammer, so that the first hammer is coupled in rotation with the second hammer in the absence of a force, applied on the second hammer, greater than a value predetermined by the stiffness of the elastic coupling member.

[0019] Such a reset mechanism ensures that the chronograph counters are completely reset to their reference position.

[0020] With such an architecture, rotational coupling between the two hammers is guaranteed regardless of the angular position of the hammers and the reset control, since the coupling force between the two hammers is not dependent on the angular stroke of the reset control.

[0021] In addition to the characteristics mentioned in the preceding paragraph, the chronograph mechanism according to the invention may have one or more additional characteristics from among the following, considered individually or in all technically possible combinations: a rotating movable eccentric member, carried by one of the hammers, configured to cooperate with one of the legs of the elastic coupling member by changing its angular position; the eccentric member is carried by the first hammer, said eccentric member having a first angular position configured to cooperate with the second leg of the elastic coupling member and to elastically constrain the elastic coupling member so as to release the support of the second leg on the second hammer; the eccentric member has a second angular position in which the eccentric member is at a distance from the elastic coupling member, so that the second leg is in contact with a support member of the second hammer; the first angular position of the eccentric member is a mounting position and the second angular position of the eccentric member is an operating position;the eccentric member is carried by the second hammer, said eccentric member having a first angular position configured to cooperate with the second leg of the elastic coupling member and to elastically constrain the elastic coupling member so that the second leg rests on the eccentric member; the eccentric member has a second angular position in which the eccentric member is at a distance from the elastic coupling member, so that the second leg rests on a support member carried by the first hammer; the first angular position of the eccentric member is a position of use and the second angular position of the eccentric member is a mounting position;One of the two hammers includes a stop member cooperating in support with a bearing surface of the other hammer in the absence of a force applied to the second hammer above a value predetermined by the stiffness of the elastic coupling member; the chronograph mechanism includes a device limiting relative angular movements between the first hammer and the second hammer; the device limiting relative angular movements is formed by a pin integral with the second hammer cooperating with an opening made in the body of the first hammer; the pin forms said second support member of the second hammer; the reset mechanism includes a reset control actuated by the user and configured to set one of the two hammers in rotation; the reset mechanism includes a reset control actuated by the user and configured to set the first hammer in rotation;The first hammer has a first peen configured to strike the first reset member, and the second hammer has a second peen configured to strike the second reset member, the second peen having an angular lead relative to the first peen; the first and second hammers have a common axis of rotation; the chronograph mechanism includes at least one position indicator provided on one of the two hammers to indicate a particular angular position of the eccentric member.

[0022] Another aspect of the invention relates to a watch movement comprising such a chronograph mechanism according to the invention.

[0023] Another aspect of the invention relates to a timepiece comprising such a timepiece movement according to the invention comprising a chronograph mechanism according to the invention.

[0024] The timepiece is preferably a wristwatch comprising a watch case configured to receive and house the timepiece movement according to the invention. Brief description of the figures

[0025] The aims, advantages and features of the present invention will become apparent from the detailed description below, which refers to the following figures: there figure 1 is a partial schematic representation of an example of an embodiment of a chronograph mechanism according to the invention in position within a clockwork movement; the figure 2 illustrates the chronograph mechanism shown in the figure 1 , according to a perspective view; the figure 3 is an exploded view illustrating more precisely a first hammer and a second hammer superimposed and elastically coupled by an elastic coupling member of the chronograph mechanism according to the invention illustrated in the figure 1 ; there figure 4illustrates more specifically the lower hammer of the chronograph mechanism which includes a pre-assembly element.

[0026] In all figures, common elements bear the same reference numbers unless otherwise specified. Detailed description of the invention

[0027] There figure 1 is a partial schematic representation, in top view, of a chronograph mechanism 10 integrated into a watch movement 1 according to the invention.

[0028] There figure 2 illustrates in perspective the chronograph mechanism 10 shown at the figure 1 .

[0029] With reference to Figures 1 And 2 , the clock movement 1 includes a plate 2 which serves as a support for the various elements of the clock movement 1, in particular a timekeeping gear (not shown) dedicated to the division of time which is driven by a source of energy (not shown).

[0030] The chronograph mechanism 10 includes a chronograph gear train 20 which can be kinematically linked, on demand, with the time train, via a clutch (not shown) controlled by a chronograph start / stop control.

[0031] For example, the clutch is a rocker clutch that allows a clutch wheel to pivot. Other known clutch designs are also applicable.

[0032] The chronograph gear train 20 includes in particular a first chronograph counter comprising a first chronograph counter wheel 21, for example a wheel of a seconds counter, and a second chronograph counter comprising a second chronograph counter wheel 22, for example a wheel of a minutes counter.

[0033] The first seconds counter wheel 21 is coupled to a first shaft 213, called the seconds counter shaft, which drives a chronograph seconds hand (not shown). The first shaft 213 also carries a first reset mechanism 51, which is rotationally fixed to the shaft 213.

[0034] The second minute counter wheel 22 is coupled to a second shaft 223, called the minute counter shaft, which drives a chronograph minute hand (not shown). The second shaft 223 also carries a second reset mechanism 52, which is fixed to the rotation of the shaft 223.

[0035] The first tree 213 and the second tree 223 are coaxial.

[0036] The first seconds counter wheel 21 and the second minutes counter wheel 22 are superimposed and arranged in two separate, superimposed, and parallel planes. The respective reset mechanisms 51 and 52 are also superimposed with respect to each other.

[0037] The reset devices 51, 52 are for example snail-shaped, heart-shaped, or other reset cams, the shape of which allows the needles to be repositioned in a reference position under the action of reset hammers.

[0038] In the example shown, the reset devices 51, 52 are reset cores.

[0039] As shown, the chronograph gear train 20 may also include a third additional counter, for example an hour counter, comprising a third chronograph counter wheel 23 associated with a third reset organ 53.

[0040] The chronograph gear train 20 may include intermediate chronograph wheels to obtain the desired ratios between the different counter wheels 21, 22, 23 of the chronograph mechanism 10.

[0041] The chronograph mechanism 10 also includes a reset mechanism 100 for resetting the various chronograph counters, and a repositioning to the reference position of the reset organs 51, 52, 53 and the hands associated with these counters.

[0042] The reset mechanism 100 comprises a first hammer 110 and a second hammer 120, superimposed one on top of the other and shaped to cooperate respectively with the first reset element 51 of the first chronograph counter and the second reset element 52 of the second chronograph counter. The hammers 110 and 120 are rotated by a reset control 60, which can be operated by the user, for example, via a pusher or an actuating pin 61.

[0043] The reset control 60 is movable in rotation around a rotation axis 66 and cooperates directly or indirectly with one of the hammers 110, 120.

[0044] In the illustrated embodiment, the reset control 60 cooperates directly with the first hammer 110, located in the lower position (i.e., the proximal hammer of the stage 2). However, the reset control 60 can also cooperate directly with the second hammer 120, located in the upper position (i.e., the distal hammer of the stage 2).

[0045] For this purpose, the first hammer 110 includes an activation portion 113, for example a pin, a gauge, mounted projecting securely on the body of the first hammer 110, configured to cooperate in direct contact with a portion of the reset control 60.

[0046] There figure 3 illustrates more particularly an exploded view of the set of hammers 110, 120 superimposed according to the invention.

[0047] The first hammer 110 and the second hammer 120 are mounted to pivot independently of each other, around a common axis of rotation 105. In one embodiment, the first hammer 110 and the second hammer 120 may have different axes of rotation, parallel to each other.

[0048] The second hammer 120 has limited angular freedom relative to the first hammer 110. For this purpose, an angular movement limiting device is provided between the first hammer 110 and the second hammer 120 to limit the angular stroke of the second hammer 120 relative to the first hammer 110.

[0049] For example, the relative angular movement limiting device is formed by a pin 112 attached to one of the two hammers 110, 120, for example attached to the second hammer 120, cooperating with an opening 117 made in the body of the other hammer 120, 110, for example the first hammer 110, to limit the relative angular displacements between the two hammers 110, 120.

[0050] Opening 117, visible at the figure 4 which illustrates in more detail the first hammer 110, is for example oblong in shape or in the shape of an arc of a circle, so as to allow limited relative angular movements between the two hammers 110, 120 around the axis of rotation 105.

[0051] An elastic coupling member 116 is provided between the first hammer 110 and the second hammer 120 to achieve an elastic coupling between the two hammers 110, 120.

[0052] More specifically, the elastic coupling member 116 allows the first hammer 110 and the second hammer 120 to be coupled in rotation, while allowing the relative angular freedom of the second hammer 120, described previously, by elastic deformation of the elastic coupling member 116 when a force, greater than a predetermined value and defined by the stiffness of the elastic coupling member 116, is applied on the second hammer 120.

[0053] More specifically, the elastic coupling member 116 includes a first elastic leg 116.1 bearing on a first support member 111 of the first hammer 110, and a second elastic leg 116.2 bearing on a second support member of the second hammer 120.

[0054] The two elastic legs 116.1, 116.2 meet at a central, elbow-shaped body 116.3. The elastic coupling element 116 is, for example, a spring, a leaf spring, a string spring, etc.

[0055] In the embodiment shown, the second support member of the second hammer is formed by the pin 112 of the second hammer 120. However, it is possible to provide a second support member independent of the pin 112.

[0056] The second support member and / or the pin 112 may be added elements or made from material with the body of the second hammer 120.

[0057] The elastic coupling member 116 is configured to constrain the second hammer 120 against the first hammer 110 in the absence of a force applied to the second hammer 120 greater than a value predetermined by the stiffness of the elastic coupling member 116, in order to couple the second hammer 120 in rotation to the first hammer 110.

[0058] More specifically, the second hammer 120 includes a stop member 122, directed towards the first hammer 110, and configured to cooperate with a bearing surface 118 of the first hammer 110. Under the elastic stress of the elastic coupling member 116 bearing on the two hammers 110, 120, the stop member 122 of the second hammer 120 is held in contact with the bearing surface 118 of the first hammer 110.

[0059] The first hammer 110 has a first peen 115 configured to strike the first reset mechanism 51 of the first counter. The second hammer 120 has a second peen 126 configured to strike the second reset mechanism 52 of the second counter.

[0060] In a stable position, i.e. without exerting force on the second hammer 120 greater than a predetermined value related to the stiffness of the elastic coupling member 116, the second purlin 126 of the second hammer 120 is not aligned with the first purlin 115 of the first hammer 110. Indeed, the second purlin 126 of the second hammer 120 has a slight offset forward (i.e. in the direction of the reset members 51, 52) relative to the first purlin 115 of the first hammer 110.

[0061] The advance of the second purlin 126 of the second hammer 120 ensures that the two reset members 51, 52 will be in their reference position at the end of the movement of the hammers 110, 120 and the reset control 60. Indeed, during the actuation of the hammers 110, 120, once the second reset member 52 of the second counter is in the reset position, an additional angular displacement of the hammers 110, 120 will generate on the second purlin 126 of the second hammer 120 a force greater than the stiffness of the elastic coupling member 116, which will allow the first reset member 51 of the first counter to continue to be reset if it is not yet in the reference position. A retrograde movement of the second hammer 120 relative to the first hammer 110 is therefore initiated by going against the elastic force of the elastic coupling member 116.

[0062] The chronograph mechanism described below works as follows:

[0063] When the user applies pressure to the reset control 60, via the actuation pin 61, the reset control 60 pivots around its axis of rotation 66, which has the effect of engaging the activation portion 113 of the first hammer 110 and pivoting the first hammer 110 around the axis of rotation 105.

[0064] In the absence of force applied to the second purlin 126 of the second hammer 120, the second hammer 120 is coupled in rotation to the first hammer 110, it is therefore also set in motion by the reset control 60 and pivots around the axis of rotation 105.

[0065] The two hammers 110, 120 continue their angular movement under the action of the reset control 60 until the pegs 115, 126 strike the respective reset devices 51, 52.

[0066] Due to the advance of the second breakdown 126 of the second hammer 120, the second reset device 52 will be returned to the reference position before reaching the full angular stroke of the reset control 60.

[0067] By continuing, the angular displacement of the reset control 60, the second reset member 52 of the second counter, being in the reference position which is a stable position, induces a force on the second purlin 126 greater than the stiffness of the elastic coupling member 116, which has the effect of elastically deforming the elastic coupling member 116 and modifying the relative position of the two hammers 110, 120. This decoupling of the two hammers 110, 120 allows the first hammer 110 to continue its angular displacement, driven by the reset control 60, to ensure a complete reset of the first reset member 51 of the first counter.

[0068] At the end of the reset control stroke 60, the two breakdowns 116 and 126 are aligned with each other and the two reset devices 51, 52 are positioned in their reference position.

[0069] The second hammer 120 also includes a third peen 127 configured to return the third reset device 53 to the reference position.

[0070] According to the invention, the reset mechanism 100 advantageously includes an eccentric member 200 to facilitate the mounting of the elastic coupling member 116 between the two hammers 110, 120. Such a pre-mounting member 200 also allows the two hammers 110, 120 to be pre-assembled before their mounting in the watch movement 1.

[0071] According to a first variant embodiment shown in the figures, the eccentric member 200 makes it possible in particular to release the support contact between the elastic coupling member 116 and one of the hammers 110, 120, in particular for the mounting of the two hammers 110, 120.

[0072] For example, the eccentric member 200 is configured to release the support contact between the elastic coupling member 116 and the pin 112 of the second hammer 120, or to release the support contact between the elastic coupling member 116 and a second support surface receiving support from part of the elastic coupling member 116.

[0073] To that end, as represented in the figure 4 The eccentric element, for example an eccentric clamping element or an eccentric screw, is carried, for example, by the first hammer 110, and is free to rotate about its axis of rotation. The eccentric element has a body whose axis of rotation is not centered on the body.

[0074] Friction is provided, for example, between the eccentric organ 200 and the first hammer 110 to ensure that the eccentric organ is held in position.

[0075] The eccentric member 200 has a first position, called the mounting position, configured to cooperate with the second leg 116.2 of the elastic coupling member 116 and elastically constrain the elastic coupling member 116 so as to be recessed relative to the pin 112. Thus, the eccentric member 200 allows for pre-mounting, freeing the bearing of the second leg 116.2 on the second hammer 120, and more specifically on the pin 112 in the described embodiment. This position is particularly shown in the figure 4 .

[0076] The eccentric organ 200 also has a second position, called the operating position, illustrated by dotted lines on the figure 4in which the eccentric member 200 is at a distance from the elastic coupling member 116, so that the second leg 116.2 of the elastic coupling member 116 is free to come into contact with the second hammer 120, and more particularly with the pin 112 in the described embodiment. This position of the elastic coupling member 116 is also shown in dashed lines on the figure 4 .

[0077] According to a second embodiment, the eccentric member 200 is used to achieve the elastic coupling between the two hammers 110, 120, that is to say that one of the legs of the elastic coupling member is in contact with the eccentric member in operation.

[0078] For example, the eccentric member 200 is carried by the second hammer 120, the eccentric member having a first angular position configured to cooperate with the second leg 116.2 of the elastic coupling member 116 and to elastically constrain the elastic coupling member 116 so that the second leg 116.2 bears against the eccentric member 200. The eccentric member 200 has a second angular position in which the eccentric member 200 is at a distance from the elastic coupling member 116, so that the second leg 116.2 bears against a support member carried by the first hammer 110. Thus, in this embodiment, the second position of the eccentric member 200 in which it is not in contact with the elastic coupling member 116 is a mounting position. That is to say, during assembly, the elastic cutting element 116 is held pre-mounted on one of the hammers between two support elements.In use, and to achieve the coupling between the two hammers, the eccentric member 200 is positioned in the first position, which is a position of use, to constrain the elastic coupling member 116 and recover the support of the second elastic leg 116.2.

[0079] The eccentric organ 200 has a recess allowing the introduction of a tool, in order to facilitate its rotation.

[0080] Preferably, the mechanism includes at least one position indicator 128 provided on one of the two hammers 110, 120 to indicate the first angular position of the eccentric member 200 or the second angular position of the eccentric member 200. Preferably, the mechanism includes a first indicator indicating the mounting position and a second indicator indicating the operating position.

[0081] Typically, the reset control 60 cooperates with an elastic reset element (not shown) configured to reposition the reset control 60 to the neutral rest position between each user activation.

[0082] The reset mechanism 100 may also include a retaining element (not shown) to secure the reset mechanism 100 and ensure full actuation of the reset control 60. The retaining element is configured to momentarily prevent the actuation of the reset control 60, and thus of the hammers 11, 120, until a certain force is applied to the reset control 60. Such a retaining element is a safety device preventing an unwanted reset of the chronograph mechanism hands 10. The retaining element exhibits dynamic behavior similar to a mechanical fuse.

[0083] As shown in the various figures, the chronograph mechanism 10 includes a column wheel 63 to control the various movements of different levers that bear against a column or between two columns. The operation of a chronograph mechanism 10 with such a column wheel 63 is widely known, so further explanation of its function is unnecessary.

[0084] Of course, the chronograph mechanism 10 can also be a cam chronograph mechanism in place of the column wheel 63 without going out of the context of the invention.

[0085] The invention also relates to a timepiece, for example a wristwatch, comprising such a timepiece movement.

Claims

1. Chronograph mechanism (10) for a watch movement (1) comprising a first chronograph counter wheel (21) integral with a first reset member (51), a second chronograph counter wheel (22) integral with a second reset member (52), not coplanar with the first reset member (51), the chronograph mechanism (10) comprising a reset mechanism (100) including: - a first hammer (110) and a second hammer (120) configured on two levels to cooperate respectively with the first reset member (51) and the second reset member (52); the first hammer (110) and the second hammer (120) being pivotable independently of each other; - an elastic coupling member (116), provided between the first hammer (110) and the second hammer (120), comprising a first leg (116.1) bearing on the first hammer (110) and a second leg (116.2) supported on the second hammer (120) so as to constrain by elastic effect the second hammer (120) supported on the first hammer (110), so that the first hammer (110) is coupled in rotation with the second hammer (120) in the absence of a force applied on the second hammer (120) greater than a value predetermined by the stiffness of the elastic coupling member (116).

2. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in that the reset mechanism (100) includes a rotating movable eccentric member (200), carried by one of the hammers (110, 120), configured to cooperate with one of the legs (116.1, 116.2) of the elastic coupling member (116) by modifying its angular position.

3. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in thatthe eccentric member (200) is carried by the first hammer (110), said eccentric member (200) having a first angular position configured to cooperate with the second leg (116.2) of the elastic coupling member (116) and to elastically constrain the elastic coupling member (116) so as to release the support of the second leg (116.2) on the second hammer (120).

4. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in that the eccentric organ (200) has a second angular position in which the eccentric organ (200) is at a distance from the elastic coupling organ (116), so that the second leg (116.2) is supported on a support organ (112) of the second hammer (120).

5. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in thatthe first angular position of the eccentric organ (200) is a mounting position and in that the second angular position of the eccentric organ (200) is a position of use.

6. Chronograph mechanism (10) for a watch movement (1) according to any one of claims 1 to 2, characterized in that the eccentric member (200) is carried by the second hammer (120), said eccentric member (200) having a first angular position configured to cooperate with the second leg (116.2) of the elastic coupling member (116) and to elastically constrain the elastic coupling member (116) so that the second leg (116.2) is in contact with the eccentric member (200).

7. Chronograph mechanism (10) for watch movement (1) according to claim 6 characterized in thatthe eccentric organ (200) has a second angular position in which the eccentric organ (200) is at a distance from the elastic coupling organ (116), so that the second leg (116.2) is supported on a support organ carried by the first hammer (110).

8. Chronograph mechanism (10) for watch movement (1) according to claim 7 characterized in that the first angular position of the eccentric organ (200) is a position of use and in that the second angular position of the eccentric organ (200) is a mounting position.

9. Chronograph mechanism (10) for a watch movement (1) according to any one of the preceding claims characterized in thatone of the two hammers (110, 120) has a stop member (122) cooperating in support with a support surface (118) of the other hammer (120, 110) in the absence of a force applied on the second hammer (120) greater than a value predetermined by the stiffness of the elastic coupling member (116).

10. Chronograph mechanism (10) for a watch movement (1) according to any one of the preceding claims characterized in that the chronograph mechanism (10) includes a device limiting relative angular movements between the first hammer (110) and the second hammer (120).

11. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in that The relative angular movement limiting device is formed by a pin attached to the second hammer (120) cooperating with an opening (117) made in the body of the first hammer (110).

12. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in that the pin forms the said second support member (112) of the second hammer (120).

13. Chronograph mechanism (10) for a watch movement (1) according to any one of the preceding claims characterized in that the reset mechanism (100) includes a user-operable reset control (60) configured to set one of the two hammers (110, 120) into rotational motion.

14. Chronograph mechanism (10) for watch movement (1) according to the preceding claim characterized in that the reset mechanism (100) includes a user-operable reset control (60) configured to set the first hammer (110) into rotational motion.

15. Chronograph mechanism (10) for a watch movement (1) according to any one of the preceding claims characterized in thatthe first hammer (110) has a first peen (115) configured to strike the first reset device (51) and in that the second hammer (120) has a second peen (126) configured to strike the second reset member (52), the second peen (126) having an angular lead relative to the first peen (115).

16. Chronograph mechanism (10) for a watch movement (1) according to any one of the preceding claims characterized in that the first hammer (110) and the second hammer (120) have a common axis of rotation (105).

17. Chronograph mechanism (10) for a watch movement (1) according to any one of the preceding claims characterized in that the chronograph mechanism (10) includes at least one position indicator (128) provided on one of the two hammers (110, 120) to indicate a particular angular position of the eccentric organ (200).

18. Clock movement (1) comprising a chronograph mechanism (10) according to any one of claims 1 to 17.

19. Timepiece comprising a timepiece movement (1) according to the preceding claim.

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