Timepiece movement and timepiece movement comprising same

Abstract

This invention relates to a timing mechanism for a watch movement, the timing mechanism comprising a first timing counter wheel fixed to a first zeroing member and a second timing counter wheel fixed to a second zeroing member, the second zeroing member being non-coplanar with the first zeroing member, the timing mechanism comprising a zeroing mechanism comprising: a first zeroing hammer (110) and a second zeroing hammer (120) disposed on two levels and pivoting independently relative to each other; an elastic connecting member (116) disposed between the two zeroing hammers and comprising a first leg and a second leg, the first leg abutting against a first support member of the first zeroing hammer and the second leg abutting against a second support member of the second zeroing hammer to elastically constrain the second zeroing hammer relative to the first zeroing hammer such that the first zeroing hammer and the second zeroing hammer are rotatably connected when no force greater than a predetermined value determined by the stiffness of the elastic connecting member is applied to the second zeroing hammer.

Description

Technical Field

[0001] This invention relates to a timing mechanism for a watch movement.

[0002] More specifically, the present invention relates to a timing mechanism including a zeroing mechanism for resetting a timing counter to zero.

[0003] The present invention also relates to a clock including such a timing mechanism. Background Technology

[0004] The timing mechanism can use multiple timing counters (such as minute counters and second counters) to measure time as required.

[0005] Timing mechanisms typically include a zeroing mechanism to reset the timing counters, returning them to a reference position so that time can be measured again as required.

[0006] Typically, such a zeroing mechanism includes a zeroing control that can be operated by the user, for example by means of a button or actuation pin that can be accessed from the outside of the middle component where the watch movement is mounted.

[0007] The zeroing control unit works directly or indirectly via a lever with one or more zeroing hammers, which strike the zeroing cams carried by each timing counter.

[0008] The timing counters and their corresponding pointers are reset to zero by the following method: the zeroing hammer rests against the zeroing cam, thereby generating sufficient driving torque to change the position of the timing counters until they return to the reference position determined by the geometry of the zeroing hammer and the zeroing cam.

[0009] In existing timing mechanisms, the zeroing hammer is either integrally formed or consists of multiple independent components fixed to each other by a fixing device. In this case, they share a single drive control unit. Exemplary embodiments are described in detail in patent application EP 2241945.

[0010] Adjusting the zeroing mechanism is complex, time-consuming, and requires highly skilled craftsmanship. In fact, to adjust such a mechanism, the seconds zeroing hammer must first be brought into contact with the seconds zeroing cam at its reference position. Then, the head of the minutes zeroing hammer must be leveled so that the minutes zeroing cam is also in its reference position. This operation is time-consuming and complex, and can only be performed by professional watchmakers.

[0011] One solution to this cumbersome calibration operation is to use two overlapping zeroing hammers, linking their angular movements while allowing for a limited relative angular movement of one hammer relative to the other during zeroing. This solution is described in detail in patent CH220536. Specifically, this method allows both zeroing hammers to act simultaneously on their respective cardioid components, helping to prevent the timing pointer from drifting at the reference position.

[0012] However, in this solution, the energy is very small when the overlapping zeroing hammer contacts the zeroing cam because most of the actuation energy is absorbed by the reset and damping springs, which exert increased resistance to the movement of the zeroing hammer. Therefore, this mechanism carries the risk that the timing counter may not return to zero correctly.

[0013] Therefore, it is necessary to improve the timing mechanism, especially the zeroing mechanism of the counter used in this timing mechanism. Summary of the Invention

[0014] Therefore, the present invention aims to provide a timing mechanism that solves at least one of the above-mentioned problems.

[0015] One of the objectives of this invention is to provide a zeroing mechanism that can provide precise zeroing for various timing counters.

[0016] One of the objectives of this invention is to provide a reliable and safe zeroing mechanism.

[0017] One of the objectives of this invention is to provide a solution that makes it easier to assemble a set of multiple rotary-connected overlapping zeroing hammers.

[0018] Therefore, the present invention relates to a timing mechanism for a watch movement, the timing mechanism comprising a first timing counter wheel fixed to a first zeroing member and a second timing counter wheel fixed to a second zeroing member, the second zeroing member being non-coplanar with the first zeroing member, the timing mechanism including a zeroing mechanism, the zeroing mechanism comprising:

[0019] - A first zeroing hammer and a second zeroing hammer, the first zeroing hammer and the second zeroing hammer being configured on two levels to cooperate with the first zeroing component and the second zeroing component respectively; the first zeroing hammer and the second zeroing hammer pivot independently of each other;

[0020] - An elastic connecting member disposed between the first zeroing hammer and the second zeroing hammer, the elastic connecting member including a first leg and a second leg, the first leg abutting against the first zeroing hammer and the second leg abutting against the second zeroing hammer, so as to elastically constrain the second zeroing hammer relative to the first zeroing hammer, such that when no force greater than a predetermined value determined by the stiffness of the elastic connecting member is applied to the second zeroing hammer, the first zeroing hammer and the second zeroing hammer are rotatably connected.

[0021] This zeroing mechanism ensures that the timing counter is completely zeroed to its reference position.

[0022] With this structure, the rotational connection between the two zeroing hammers can be guaranteed regardless of the angular position of the zeroing hammers and the zeroing control component, because the connection force between the two zeroing hammers does not depend on the angular stroke of the zeroing control component.

[0023] In addition to the features mentioned in the preceding paragraphs, the timing mechanism according to the invention may have one or more of the following supplementary features, which may be used individually or in any technically feasible combination:

[0024] - The zeroing mechanism includes a rotatable eccentric member supported by one of the first zeroing hammer and the second zeroing hammer, the eccentric member being configured to engage with one of the first leg and the second leg of the elastic connecting member by changing its angular position;

[0025] - The eccentric member is supported by the first zeroing hammer. The eccentric member has a first angular position. In the first angular position, the eccentric member is configured to cooperate with the second leg of the elastic connecting member and elastically constrain the elastic connecting member so as to release the pressure of the second leg acting on the second zeroing hammer.

[0026] - The eccentric member has a second angular position. At the second angular position, the eccentric member is a certain distance away from the elastic connecting member, so that the second leg abuts against the supporting member of the second zeroing hammer.

[0027] - The first corner position of the eccentric component is the assembly position, and the second corner position of the eccentric component is the working position;

[0028] - The eccentric member is supported by the second zeroing hammer. The eccentric member has a first angular position. In the first angular position, the eccentric member is configured to cooperate with the second leg of the elastic connecting member and elastically constrain the elastic connecting member, so that the second leg abuts against the eccentric member.

[0029] - The eccentric member has a second angular position, at which the eccentric member is a certain distance away from the elastic connecting member, so that the second leg abuts against the supporting member carried by the first zeroing hammer;

[0030] - The first angular position of the eccentric component is the working position, and the second angular position of the eccentric component is the assembly position;

[0031] - One of the first zeroing hammer and the second zeroing hammer includes a stop member that abuts against the support surface of the other zeroing hammer when no force greater than a predetermined value determined by the stiffness of the elastic connection member is applied to the second zeroing hammer located above.

[0032] - The timing mechanism includes a limiting device for restricting the relative angular movement between the first zeroing hammer and the second zeroing hammer;

[0033] - The limiting device is formed by a column fixed to the second zeroing hammer, which engages with an opening formed in the body of the first zeroing hammer;

[0034] - The column forms a support member for the second zeroing hammer;

[0035] - The zeroing mechanism includes a zeroing control element that can be actuated by a user and configured to rotate one of the first zeroing hammer and the second zeroing hammer;

[0036] - The zeroing mechanism includes a zeroing control element that can be actuated by a user and configured to rotate the first zeroing hammer;

[0037] - The first zeroing hammer includes a first hammer head configured to strike the first zeroing component, and the second zeroing hammer includes a second hammer head configured to strike the second zeroing component, the second hammer head being angularly forward relative to the first hammer head;

[0038] - The first zeroing hammer and the second zeroing hammer have a common axis of rotation;

[0039] - The timing mechanism includes at least one position indicator arranged on one of the first zeroing hammer and the second zeroing hammer, for indicating the specific angular position of the eccentric member.

[0040] Another aspect of the invention relates to a watch movement comprising a timing mechanism according to the invention.

[0041] Another aspect of the invention relates to a clock or watch comprising a clock movement according to the invention, the clock movement comprising a timing mechanism according to the invention.

[0042] The timepiece is preferably a wristwatch, which includes a case configured to receive and house a timepiece movement according to the invention. Attached Figure Description

[0043] The objects, advantages, and features of the present invention will become clear from the following detailed description with reference to the accompanying drawings, in which:

[0044] Figure 1 This is a partial schematic diagram of an exemplary embodiment of the timing mechanism according to the present invention, which is positioned in a watch movement;

[0045] Figure 2 It shows Figure 1 A perspective view of the timing mechanism shown;

[0046] Figure 3 It's an exploded view, showing more details. Figure 1 The first and second zeroing hammers of the timing mechanism according to the present invention are overlapped and elastically connected by an elastic connecting member;

[0047] Figure 4 More specifically, the zeroing hammer of the timing mechanism located below is shown, which includes pre-assembled components.

[0048] In all the accompanying drawings, unless otherwise stated, common elements have the same reference numerals. Detailed Implementation

[0049] Figure 1 This is a partial schematic top view of the timing mechanism 10 integrated into the watch movement 1 according to the present invention.

[0050] Figure 2 It shows Figure 1 A perspective view of the timing mechanism 10 shown.

[0051] refer to Figure 1 and Figure 2 The watch movement 1 includes a plate 2 for supporting the various components of the watch movement 1, and in particular for supporting a time train (not shown) dedicated to dividing time, which is driven by an energy source (not shown).

[0052] The timing mechanism 10 includes a timing gear train 20, which can be kinematically connected as needed to an hour gear train via a coupling (not shown), which is controlled by a timing start / stop control.

[0053] For example, the connector is a lever-type connector that allows the connecting wheel to pivot. Other variations of the connector known to those skilled in the art are also applicable.

[0054] Specifically, the timing wheel system 20 includes a first timing counter and a second timing counter. The first timing counter includes a first timing counter wheel 21, such as a second counter wheel, and the second timing counter includes a second timing counter wheel 22, such as a minute counter wheel.

[0055] A first timing counter wheel 21 is connected to a first spindle 213, called a second counter spindle, which drives the second hand on a chronograph (not shown). The first spindle also carries a first zeroing member 51, which is rotatably fixed to the first spindle 213.

[0056] The second timing counter wheel 22 is connected to a second spindle 223, called the minute counter spindle, which drives the minute hand (not shown). The second spindle 223 also carries a second zeroing member 52, which is rotatably fixed to the second spindle 223.

[0057] The first mandrel 213 is coaxial with the second mandrel 223.

[0058] The first timing counter wheel 21 and the second timing counter wheel 22 overlap each other and are arranged in two overlapping and parallel independent planes. The corresponding first zeroing component 51 and second zeroing component 52 also overlap each other.

[0059] The first zeroing component 51 and the second zeroing component 52 are, for example, worm-shaped, heart-shaped or other shaped zeroing cams, whose shape allows them to return to the reference position of the pointer when actuated by the zeroing hammer.

[0060] In the example shown, the first zeroing component 51 and the second zeroing component 52 are zeroing heart-shaped components.

[0061] As shown in the figure, the timing wheel train 20 may also include an additional third counter, such as an hour counter, which includes a third timing counter wheel 23 connected to the third zeroing member 53.

[0062] The timing wheel train 20 may include an intermediate timing movement to obtain the desired ratio between the individual counter wheels of the timing mechanism 10.

[0063] The timing mechanism 10 also includes a zeroing mechanism 100 for resetting each timing counter and returning each zeroing element and the pointers corresponding to these counters to their reference positions.

[0064] The zeroing mechanism 100 includes a first zeroing hammer 110 and a second zeroing hammer 120 that overlap each other and are configured to engage with a first zeroing component 51 of a first timer counter and a second zeroing component 52 of a second timer counter, respectively. The first zeroing hammer 110 and the second zeroing hammer 120 are rotated by a zeroing control member 60, which can be operated by a user, for example, via a button or an actuating pin 61.

[0065] The zeroing control unit 60 can rotate around the rotation axis 66 and cooperate directly or indirectly with one of the first zeroing hammer 110 and the second zeroing hammer 120.

[0066] In the exemplary embodiment shown, the zeroing control member 60 directly engages with the first zeroing hammer 110 located at the lower position (i.e., the zeroing hammer close to the machine plate 2). However, the zeroing control member 60 may also directly engage with the second zeroing hammer 120 located at the upper position (i.e., the zeroing hammer away from the machine plate 2).

[0067] For this purpose, the first zeroing hammer 110 includes an actuating part 113, such as a pin or post, which is mounted to extend from the body of the first zeroing hammer 110 and configured to engage with a portion of the zeroing control member 60 in direct contact.

[0068] Figure 3 An exploded view of the overlapping first zeroing hammer 110 and second zeroing hammer 120 according to the present invention is shown in more detail.

[0069] The first zeroing hammer 110 and the second zeroing hammer 120 are assembled together so that they can pivot independently of each other about a common axis of rotation 105. According to a variant embodiment, the first zeroing hammer 110 and the second zeroing hammer 120 may have different axes of rotation that are parallel to each other.

[0070] The second zeroing hammer 120 has a limited angular degree of freedom relative to the first zeroing hammer 110. Therefore, a limiting device is arranged between the first zeroing hammer 110 and the second zeroing hammer 120 to limit the relative angular movement of the second zeroing hammer 120 relative to the first zeroing hammer 110.

[0071] For example, the limiting device for restricting relative angular movement is formed by a post 112 fixed to one of the two zeroing hammers (e.g., fixed to the second zeroing hammer 120), the post 112 engaging with an opening 117 formed in the body of the other zeroing hammer (e.g., the first zeroing hammer 110) to restrict relative angular movement between the two zeroing hammers.

[0072] Figure 4 The first zeroing hammer 110 is shown in more detail. Figure 4An opening 117 can be seen, which is, for example, oblong or arc-shaped, to allow the two zeroing hammers to move in a limited relative angular direction around the axis of rotation 105.

[0073] An elastic connecting member 116 is arranged between the first zeroing hammer 110 and the second zeroing hammer 120 to create an elastic connection between the two zeroing hammers.

[0074] More specifically, the elastic connecting member 116 enables the first zeroing hammer 110 and the second zeroing hammer 120 to be rotatably connected by its elastic deformation, while allowing the second zeroing hammer 120 to have relative angular degrees of freedom when a force greater than a predetermined value determined by the stiffness of the elastic connecting member 116 is applied to the second zeroing hammer 120.

[0075] More specifically, the elastic connecting member 116 includes an elastic first leg 116.1 and an elastic second leg 116.2. The first leg 116.1 abuts against the first timing counter wheel 21 member 111 of the first zeroing hammer 110, and the second leg 116.2 abuts against the second support member of the second zeroing hammer 120.

[0076] The first leg 116.1 and the second leg 116.2 are connected to the elbow-shaped central body 116.3. The elastic connecting member 116 is, for example, a spring, leaf spring, string spring, etc.

[0077] In the exemplary embodiment shown, the second support member of the second zeroing hammer is formed by the column 112 on the second zeroing hammer 120. However, a second support member separate from the column 112 may be provided.

[0078] The second support member and / or column 112 may be an additional element or integrally formed with the body of the second zeroing hammer 120.

[0079] When no force greater than a predetermined value determined by the stiffness of the elastic connecting member 116 is applied to the second zeroing hammer 120, the elastic connecting member 116 is configured to constrain the second zeroing hammer 120 relative to the first zeroing hammer 110, such that the second zeroing hammer 120 is rotatably connected to the first zeroing hammer 110.

[0080] More specifically, the second zeroing hammer 120 includes a stop member 122 facing the first zeroing hammer 110 and configured to engage with the support surface 118 of the first zeroing hammer 110. Under the elastic constraint of the elastic connecting member 116 abutting against the two zeroing hammers, the stop member 122 of the second zeroing hammer 120 remains pressed against the support surface 118 of the first zeroing hammer 110.

[0081] The first zeroing hammer 110 includes a first hammerhead 115 configured to strike a first zeroing member 51 of a first counter. The second zeroing hammer 120 includes a second hammerhead 126 configured to strike a second zeroing member 52 of a second counter.

[0082] When in a stable position, that is, when no force greater than a predetermined value related to the stiffness of the elastic connecting member 116 is applied to the second zeroing hammer 120, the second hammer head 126 of the second zeroing hammer 120 is not aligned with the first hammer head 115 of the first zeroing hammer 110. In fact, the second hammer head 126 of the second zeroing hammer 120 is slightly forward relative to the first hammer head 115 of the first zeroing hammer 110 (i.e., towards the direction of the first zeroing member 51 and the second zeroing member 52).

[0083] The forward offset of the second hammer head 126 of the second zeroing hammer 120 ensures that the first zeroing component 51 and the second zeroing component 52 return to their reference positions after the movement of the first zeroing hammer 110, the second zeroing hammer 120, and the zeroing control member 60 is completed. In fact, when these two zeroing hammers are actuated, once the second zeroing component 52 of the second counter is in the zeroing position, the supplementary angular displacement of these two zeroing hammers will generate a force on the second hammer head 126 of the second zeroing hammer 120 that is greater than the stiffness of the elastic connecting member 116. This will allow the first zeroing component 51 of the first counter to continue to complete zeroing if it has not yet reached its reference position. Therefore, by counteracting the elastic force of the elastic connecting member 116, the second zeroing hammer 120 moves in the opposite direction to the first zeroing hammer 110.

[0084] The working principle of the timing mechanism is explained below:

[0085] When the user presses the zeroing control 60 with the actuating pin 61, the zeroing control 60 pivots about its rotation axis 66. The zeroing control 60 cooperates with the actuating part 113 of the first zeroing hammer 110 and causes the first zeroing hammer 110 to pivot about the rotation axis 105.

[0086] If no force is applied to the second hammer head 126 of the second zeroing hammer 120, the second zeroing hammer 120 is rotatably connected to the first zeroing hammer 110, and is therefore also activated by the zeroing control 60 and pivots about the rotation axis 105.

[0087] The two zeroing hammers continue to move angularly under the action of the zeroing control unit 60 until the first hammer head 115 of the first zeroing hammer 110 and the second hammer head 126 of the second zeroing hammer 120 strike the corresponding first zeroing component 51 and second zeroing component 52.

[0088] As the second hammer head 126 of the second zeroing hammer 120 moves forward, the second zeroing component 52 will reset to the reference position before the zeroing control component 60 completes its full angular stroke.

[0089] As the zeroing control unit 60 continues its angular displacement, the second zeroing component 52 of the second counter, which is in its reference position (i.e., stable position), applies a force to the second hammer head 126. This force is greater than the stiffness of the elastic connecting component 116, causing the elastic connecting component 116 to elastically deform, thereby changing the relative position of the two zeroing hammers. The disengagement of the two zeroing hammers allows the first zeroing hammer 110 to continue its angular movement under the drive of the zeroing control unit 60, ensuring that the first zeroing component 51 of the first counter is fully reset.

[0090] When the zeroing control element 60 reaches the end of its stroke, the two hammers are aligned with each other, and the two zeroing elements are in their reference positions.

[0091] The second zeroing hammer 120 also includes a third hammer head 127, which is configured to reset the third zeroing member 53 to its reference position.

[0092] According to the invention, the zeroing mechanism 100 advantageously includes an eccentric member 200, which makes it easier to assemble the resilient connecting member 116 between the two zeroing hammers. This pre-assembly member also allows the two zeroing hammers to be pre-assembled before they are assembled into the watch movement 1.

[0093] According to the first variant embodiment shown in the figure, the eccentric member 200 is particularly capable of releasing the support contact between the elastic connecting member 116 and one of the two zeroing hammers, especially when assembling the two zeroing hammers.

[0094] For example, the eccentric member 200 is configured to release the support contact between the resilient connecting member 116 and the column 112 of the second zeroing hammer 120, or to release the support contact between the resilient connecting member 116 and a second support surface that supports a portion of the resilient connecting member 116.

[0095] Therefore, such as Figure 4 As shown, an eccentric component (e.g., an eccentric clamping component, an eccentric screw) is supported, for example, by a first zeroing hammer 110 and is rotatable about its axis of rotation. The eccentric component has a body whose axis of rotation is not at the center of the body.

[0096] For example, friction is provided between the eccentric member 200 and the first zeroing hammer 110 to ensure that the eccentric member remains in place.

[0097] The eccentric member 200 has a first position, referred to as the assembly position, in which the eccentric member 200 is configured to engage with the second leg 116.2 of the resilient connecting member 116 and resiliently constrain the resilient connecting member 116 to retract relative to the post 112. Therefore, the eccentric member 200 can achieve pre-assembly, thereby releasing the support of the second leg 116.2 on the second zeroing hammer 120, and more specifically, in the described exemplary embodiment, releasing the support on the post 112. This position is... Figure 4 It is clearly shown in the text.

[0098] The eccentric member 200 also has a second position called the working position. Figure 4 As shown in dashed lines, in this second position, the eccentric member 200 maintains a certain distance from the elastic connecting member 116, allowing the second leg 116.2 of the elastic connecting member 116 to freely contact the second zeroing hammer 120, and more specifically, in the described exemplary embodiment, contact the column 112. This position of the elastic connecting member 116... Figure 4 The middle part is also shown with a dashed line.

[0099] According to the second variant embodiment, the eccentric member 200 is used to establish an elastic connection between the two zeroing hammers, which means that one of the legs of the elastic connection member rests against the eccentric member during operation.

[0100] For example, the eccentric member 200 is supported by the second zeroing hammer 120. The eccentric member has a first angular position in which it is configured to engage with and elastically constrain the second leg 116.2 of the elastic connecting member 116, such that the second leg 116.2 abuts against the eccentric member 200. The eccentric member 200 has a second angular position in which it maintains a certain distance from the elastic connecting member 116, such that the second leg 116.2 abuts against the support member supported by the first zeroing hammer 110. Therefore, in this variant embodiment, the second position of the eccentric member 200 is an assembly position in which it does not contact the elastic connecting member 116. This means that during assembly, the elastic connecting member 116 remains pre-assembled on one of the zeroing hammers between the two support members. In use, in order to connect the two zeroing hammers, the eccentric member 200 is positioned in the first position, i.e. the working position, to constrain the elastic connecting member 116 and restore the support of the second leg 116.2.

[0101] The eccentric component 200 has indentations, allowing the tool to be inserted to facilitate its rotation.

[0102] Preferably, the timing mechanism includes at least one position indicator 128 disposed on one of the two zeroing hammers to indicate a first angular position or a second angular position of the eccentric member 200. Preferably, the timing mechanism includes a first indicator indicating the assembly position and a second indicator indicating the working position.

[0103] Typically, the zeroing control 60 cooperates with a resilient zeroing element (not shown) configured to return the zeroing control 60 to a neutral rest position between each user actuation.

[0104] The zeroing mechanism 100 may further include a retaining member (not shown) for protecting the zeroing mechanism 100 and ensuring that the zeroing control 60 completes its actuation action. This retaining member is configured to temporarily restrict actuation of the zeroing control 60 and thus the zeroing hammer, as long as the zeroing control 60 is not subjected to a certain force. This retaining member is a safety component that prevents the pointer of the timing mechanism 10 from unintentionally returning to zero. The retaining member exhibits dynamic characteristics similar to a mechanical safety device.

[0105] As shown in the attached diagram, the timing mechanism 10 includes a column wheel 63 for controlling various movements of various levers that rest against a column or are located between two columns. Since the working principle of the timing mechanism 10 with this column wheel 63 is well known, there is no need to further explain the working principle of this wheel.

[0106] Of course, instead of the column wheel 63, the timing mechanism 10 can also be a timing mechanism with a cam installed, which does not depart from the scope of the present invention.

[0107] The present invention also relates to a timepiece, such as a wristwatch, that includes such a timepiece movement.

Claims

1. A timing mechanism (10) for a watch movement (1), the timing mechanism (10) comprising a first timing counter wheel (21) fixed to a first zeroing member (51) and a second timing counter wheel (22) fixed to a second zeroing member (52), the second zeroing member (52) being non-coplanar with the first zeroing member (51), the timing mechanism (10) comprising a zeroing mechanism (100), the zeroing mechanism (100) comprising: - A first zeroing hammer (110) and a second zeroing hammer (120), the first zeroing hammer (110) and the second zeroing hammer (120) being arranged on two levels to cooperate with the first zeroing component (51) and the second zeroing component (52) respectively; the first zeroing hammer (110) and the second zeroing hammer (120) pivoting independently of each other; - An elastic connecting member (116) is arranged between the first zeroing hammer (110) and the second zeroing hammer (120). The elastic connecting member (116) includes a first leg (116.1) and a second leg (116.2). The first leg (116.1) abuts against the first zeroing hammer (110), and the second leg (116.2) abuts against the second zeroing hammer (120) so as to elastically constrain the second zeroing hammer (120) relative to the first zeroing hammer (110) such that the first zeroing hammer (110) and the second zeroing hammer (120) are rotatably connected when no force greater than a predetermined value determined by the stiffness of the elastic connecting member (116) is applied to the second zeroing hammer (120).

2. The timing mechanism (10) for a watch movement (1) according to claim 1, characterized in that, The zeroing mechanism (100) includes a rotatable eccentric member (200) supported by one of the first zeroing hammer (110) and the second zeroing hammer (120), the eccentric member being configured to engage with one of the first leg (116.1) and the second leg (116.2) of the elastic connecting member (116) by changing its angular position.

3. The timing mechanism (10) for a watch movement (1) according to claim 2, characterized in that, The eccentric member (200) is supported by the first zeroing hammer (110). The eccentric member (200) has a first angular position. In the first angular position, the eccentric member (200) is configured to cooperate with the second leg (116.2) of the elastic connecting member (116) and elastically constrain the elastic connecting member (116) so as to release the pressure of the second leg (116.2) acting on the second zeroing hammer (120).

4. The timing mechanism (10) for a watch movement (1) according to claim 3, characterized in that, The eccentric member (200) has a second angular position, in which the eccentric member (200) is a certain distance away from the elastic connecting member (116), so that the second leg (116.2) abuts against the support member of the second zeroing hammer (120).

5. The timing mechanism (10) for a watch movement (1) according to claim 4, characterized in that, The first corner position of the eccentric component (200) is the assembly position, and the second corner position of the eccentric component (200) is the working position.

6. The timing mechanism (10) for a watch movement (1) according to claim 2, characterized in that, The eccentric member (200) is supported by the second zeroing hammer (120). The eccentric member (200) has a first angular position. In the first angular position, the eccentric member (200) is configured to cooperate with the second leg (116.2) of the elastic connecting member (116) and elastically constrain the elastic connecting member (116), so that the second leg (116.2) abuts against the eccentric member (200).

7. The timing mechanism (10) for a watch movement (1) according to claim 6, characterized in that, The eccentric member (200) has a second angular position, in which the eccentric member (200) is a certain distance away from the elastic connecting member (116), so that the second leg (116.2) abuts against the supporting member carried by the first zeroing hammer (110).

8. The timing mechanism (10) for a watch movement (1) according to claim 7, characterized in that, The first angular position of the eccentric component (200) is the working position, and the second angular position of the eccentric component (200) is the assembly position.

9. The timing mechanism (10) for a watch movement (1) according to any one of the preceding claims, characterized in that, One of the first zeroing hammer (110) and the second zeroing hammer (120) includes a stop member (122) that abuts against the support surface (118) of the other zeroing hammer when no force greater than a predetermined value determined by the stiffness of the elastic connecting member (116) is applied to the second zeroing hammer (120).

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

11. The timing mechanism (10) for a watch movement (1) according to claim 10, characterized in that, The limiting device is formed by a post fixed to the second zeroing hammer (120), which engages with an opening (117) formed in the body of the first zeroing hammer (110).

12. The timing mechanism (10) for a watch movement (1) according to claim 11, characterized in that, The column forms a support member for the second zeroing hammer (120).

13. The timing mechanism (10) for a watch movement (1) according to any one of the preceding claims, characterized in that, The zeroing mechanism (100) includes a zeroing control (60) that can be actuated by a user and configured to rotate one of the first zeroing hammer (110) and the second zeroing hammer (120).

14. The timing mechanism (10) for a watch movement (1) according to claim 13, characterized in that, The zeroing control (60) is configured to rotate the first zeroing hammer (110).

15. The timing mechanism (10) for a watch movement (1) according to any one of the preceding claims, characterized in that, The first zeroing hammer (110) includes a first hammer head (115) configured to strike the first zeroing member (51), and the second zeroing hammer (120) includes a second hammer head (126) configured to strike the second zeroing member (52), the second hammer head (126) being angularly forward relative to the first hammer head (115).

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

17. The timing mechanism (10) for a watch movement (1) according to any one of the preceding claims, characterized in that, The timing mechanism (10) includes at least one position indicator (128) arranged on one of the first zeroing hammer (110) and the second zeroing hammer (120) for indicating the specific angular position of the eccentric member (200).

18. A watch movement (1), characterized in that, The watch movement (1) includes a timing mechanism (10) according to any one of claims 1 to 17.

19. A clock, characterized in that, The watch includes the watch movement (1) according to claim 18.

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