Timepiece ratchet system

Abstract

Ratchet system (1) for a wheel (2) of a kinematic chain for winding a watch barrel (3) comprising: - a ratchet (10) having at least one tooth (1a) intended to cooperate with a tooth (2a) of the wheel (2); and - an element (6) for activating and deactivating the ratchet; the activation and deactivation element being arranged so that, in a first configuration of the activation and deactivation element, at least one tooth (1a) of the pawl cooperates with the teeth (2a) directly or indirectly, in particular under the effect of a return force of at least one tooth (1a) of the pawl against the teeth (2a), and, in a second configuration of the activation and deactivation element, at least one tooth (1a) of the pawl does not cooperate with the teeth (2a) or a return force of at least one tooth (1a) of the pawl against the teeth (2a) is reduced.

Description

[0001] The invention relates to a ratchet system for a wheel in a winding mechanism for a watch barrel. The invention also relates to a watch movement comprising such a system. The invention further relates to a timepiece comprising such a system or such a movement. The invention finally relates to a method for configuring such a movement or such a timepiece. The invention also relates to a method for assembling such a movement or such a timepiece. The invention further relates to a method for disassembling such a movement or such a timepiece. The barrel springs of manually or automatically wound timepieces are usually kept under tension by means of a ratchet designed to cooperate with a ratchet wheel square-mounted on the barrel arbor.More specifically, the ratchet immobilizes the ratchet in the direction of unwinding the mainspring, and disengages when the manual or automatic winding device is activated.

[0002] Automatic winding mechanisms are also designed to immobilize the ratchet wheel in the direction of the mainspring unwinding, so the ratchet pawl could be removed from timepieces equipped with such devices. However, the problem of disassembling the automatic mechanism exposes the watchmaker to the risk of uncontrolled and unpredictable unwinding of the mainspring. For this reason, self-winding timepieces known from the prior art also include a device, specifically a ratchet pawl, designed to immobilize the mainspring arbor. While such a solution allows the timepiece to function independently of its automatic mechanism, it is not optimal in terms of automatic winding efficiency. Indeed, in this case, the oscillating weight must overcome the resistive torque induced by the pawl, particularly the pawl spring, to allow the mainspring to wind automatically.Such a construction can therefore be problematic when the winding power of the oscillating mass is limited according to the dimensions of the timepiece, particularly when it is an automatic movement of small diameter and / or thinness.

[0003] Patent CH542468 discloses a one-piece ratchet pawl with a rigid first part and an elastic second part. The rigid part has a ratcheting tooth designed to engage with the ratchet teeth to immobilize the ratchet when unwinding the mainspring and to disengage from the ratchet teeth when winding the mainspring. To this end, the elastic part of the pawl is in the form of an elastic arm that engages when the ratcheting tooth disengages from the ratchet teeth to ensure the ratcheting tooth returns to its locking position. If such a device is integrated into a self-winding timepiece, the oscillating weight must overcome the resistive torque induced by the pawl, particularly by the elastic part of the pawl.

[0004] There are alternatives to ratchet pawls. For example, the ratchet pawl can be substituted for one or more pawls in either the manual or automatic winding mechanism. The book "The Swiss Self-Winding Watch," for instance, reveals on pages 170 to 174 a unidirectional self-winding movement without a ratchet pawl, known as the "Zenith No. 133." In this design, pawls integrated within the automatic module indirectly immobilize the ratchet in the direction of the mainspring unwinding. Such a timepiece therefore cannot function independently of its automatic module.

[0005] There are also alternatives to ratchets. Patent application WO2015193400 discloses, in a third embodiment of the invention, a unidirectional automaton device equipped with an oscillating mass pivoted by two opposing radial ball clutches. A first clutch establishes a unidirectional connection between the oscillating mass and the ratchet in a first direction of rotation of the oscillating mass. In a second direction of rotation of the oscillating mass, balls hold the automaton chain in position, thus performing the same function as a ratchet, in particular a ratchet pawl. Such a configuration advantageously allows for the implementation of a simplified automaton chain with a minimized dead angle. However, like the aforementioned Zenith caliber, such a timepiece cannot operate independently of its automaton.

[0006] Document FR 2 064 452 A1 discloses a device for transforming an oscillating motion into a unidirectional motion applied to a ratchet wheel, using two pawls for driving and positioning. This system is intended for fine oscillation mechanisms, typical of a resonator. Document EP 1 136 892 A1 discloses a ratchet system for a wheel in a kinematic chain for winding a watch barrel, comprising: a pawl having at least one tooth for engaging with a tooth on the wheel.

[0007] The aim of the invention is to provide a watch ratchet system that overcomes the aforementioned drawbacks and improves upon existing watch ratchet systems known in the prior art. In particular, the invention proposes a watch ratchet system such that the timepiece it equips can also function without an automaton module and / or such that the automaton module does not have to overcome a resistive torque induced by a ratchet.

[0008] A system according to the invention is defined by claim 1.

[0009] Embodiments of the system are defined by claims 2 to 10.

[0010] A movement according to the invention is defined by claim 11.

[0011] Methods of implementing the movement are defined by claims 12 to 15.

[0012] A timepiece according to the invention is defined by claim 16.

[0013] An embodiment of the timepiece is defined by claim 17.

[0014] A configuration method according to the invention is defined by claim 18.

[0015] The attached figures represent, by way of example, three embodiments of a timepiece according to the invention. There figure 1 is a schematic view of a first embodiment of a timepiece according to the invention, comprising a first embodiment of a watch ratchet system. figures 2 And 3 These are views of the first embodiment of the watch ratchet system in a deactivated configuration. figure 4 This is a view of a PLC module. figures 5 et 6 These are views illustrating the assembly of the PLC module of the figure 4 to obtain the first embodiment of a timepiece. The figure 7 is a perspective view of a variant of the first embodiment of the watch ratchet system. figure 8 is a schematic view of a second embodiment of a timepiece according to the invention, comprising a second embodiment of a watch ratchet system. figure 9 is a schematic view of a third embodiment of a timepiece according to the invention, comprising a third embodiment of a watch ratchet system. figure 10 is a partial cross-sectional view of an embodiment of an automaton module used preferably in a clockwork movement according to the invention.

[0016] A first embodiment of a timepiece 110 is described below with reference to figures 1 à 7 A timepiece is, for example, a watch, in particular a wristwatch. A timepiece includes a mechanical watch movement, specifically an automatic watch movement.

[0017] Advantageously, the watch movement comprises a case 99, a mainspring barrel 3, a finishing gear train, and an automaton or automaton device. The automaton device can be an automaton module M' as shown in the figure 4 Throughout this document, the terms "automaton" or "automaton device" refer to a kinematic chain for the automatic winding of the mainspring barrel 3 of the movement, or a portion thereof. This portion of the kinematic chain comprises at least one oscillating weight 5, the mechanical energy of which is used to wind the mainspring barrel.

[0018] Preferably, the automaton is bidirectional and may include reversing gears 4, 4'. The two reversing gears 4, 4' allow, on the one hand, the ratchet to be driven by transmitting motion from the oscillating mass 5 in the direction of winding a mainspring and, on the other hand, the ratchet to be held in the direction of unwinding the mainspring by the oscillating mass 5, as shown in the diagram. figure 3 Indeed, the automatic winding mechanism of the movement is irreversible. Therefore, the automaton is preferably arranged to immobilize a ratchet or wheel in a direction that unwinds the mainspring. Preferably, the automaton takes the form of an automaton module M', which includes, for example, two blanks M1' and M2' pivoting various gears of the automaton and the oscillating weight 5.

[0019] The movement includes a ratchet system for a wheel 2 of the kinematic chain for winding the watch barrel 3, i.e. a ratchet system for immobilizing a wheel 2 of the kinematic chain for winding the watch barrel 3.

[0020] The ratchet system includes: a ratchet 10 having at least one tooth 1a intended to cooperate with a tooth 2a of the wheel 2; and an element 6 for activating and deactivating the ratchet.

[0021] The activation and deactivation element is arranged so that, in a first configuration of the activation and deactivation element (represented on the figure 1 ), at least one tooth 1a of the pawl cooperates directly or indirectly with the teeth 2a, notably by obstruction and / or under the effect of a return force of at least one tooth 1a of the pawl against the teeth 2a, and, in a second configuration of the activation and deactivation element (represented on the figure 2 ), at least one tooth 1a of the pawl does not cooperate with the teeth 2a or a return force of at least one tooth 1a of the pawl against the teeth 2a is reduced, in particular reduced compared to the return force of at least one tooth 1a of the pawl against the teeth 2a in the first configuration.

[0022] In other words, the activation and deactivation element includes: a first activation configuration or a first activation position in which the activation and deactivation element causes the pawl to be activated, i.e., at least one tooth 1a of the pawl cooperates directly or indirectly with the teeth 2a, in particular by obstruction and / or under the effect of a return force of at least one tooth 1a of the pawl against the teeth 2a, and a second deactivation configuration or a second deactivation position in which the activation and deactivation element causes the pawl to be deactivated, i.e., at least one tooth 1a of the pawl does not cooperate with the teeth 2a or the return force of at least one tooth 1a of the pawl against the teeth 2a is reduced, in particular reduced compared to the return force of at least one tooth 1a of the pawl against the teeth 2a in the first configuration.

[0023] In the various embodiments described, preferably in the second configuration of the activation and deactivation element, at least one tooth 1a of the pawl does not cooperate with the teeth 2a.

[0024] Advantageously, the barrel ratchet and pawl are locked together in the first activation configuration or the first activation position of the activation and deactivation element, and the barrel ratchet and pawl are unlocked in the second activation configuration or the second deactivation position of the activation and deactivation element.

[0025] In a first variant of the first embodiment shown on the figures 1 à 6 The ratchet 10 includes a mounting element 1c for attaching it to the frame 99 of the movement 100. The mounting element is preferably located at one end of the ratchet. The mounting element includes, for example, a shape such as a base 1c with a first hole for receiving a pin or cotter pin and a through hole for a screw. The screw passes through the hole and is screwed into a tapped hole in the frame. The pin or cotter pin is partially housed in the frame and in the base. In the first embodiment, the mounting element is a fastening element for attaching it to the frame of the movement.

[0026] The pawl comprises at least one tooth 1a, in particular two teeth in this first variant of the first embodiment, located at a distance from the fastening element. Preferably, the at least one tooth 1a is arranged at a second end of the pawl. The tooth or teeth have, for example, a profile similar to those of the teeth of the ratchet mechanism 2a.

[0027] The ratchet also includes a flexible portion 1b between the fastening element 1c and at least one tooth 1a. This portion has, for example, an elongated shape like a rod or an arm. Preferably, in the first activated configuration of the ratchet, shown in the figures 1 And 5 , at least one tooth is brought back into contact with the teeth 2a. Preferably even more, in this first configuration, the pawl, in particular the flexible portion 1b of the pawl, is slightly pre-stressed and presses at least one tooth against the teeth 2a.

[0028] The pawl 1 is therefore monostable. Its first position is a position in which at least one tooth is brought into contact with the teeth 2a. Thus, the stable position is a position in which at least one tooth cooperates by way of obstruction with the teeth 2a and therefore a position in which the pawl prevents the rotation of the wheel 2, in particular prevents the rotation of the wheel 2 in the direction of unwinding or unwinding the barrel spring.

[0029] In the embodiment shown, the activation and deactivation element is an assembly means 6. This assembly means allows any device to be mounted on the movement. Advantageously, the assembly means allows a controller, in particular a controller module M', to be mounted on the movement.

[0030] In the embodiment shown, the assembly means is a screw 6.

[0031] As seen previously, a first configuration of the activation and deactivation element is such that at least one tooth 1a of the pawl cooperates by obstruction or interference with the teeth 2a and, a second configuration of the activation and deactivation element is such that at least one tooth 1a of the pawl does not cooperate with the teeth 2a or such that at least one tooth 1a of the pawl is less engaged in the teeth 2a.

[0032] Advantageously, the first configuration is a first position of the activation and deactivation element and the second configuration is a second position of the activation and deactivation element.

[0033] Advantageously, as shown on the figure 6 The assembly means has a first portion 6a of a first diameter. This first diameter is such that when the assembly means is in its second position or configuration, with the pawl in contact or bearing against the first portion, at least one tooth is at a distance from the teeth 2a or at least is only partially engaged with the teeth 2a. In this position, as shown in the figures 2 And 3 , the ratchet is elastically deformed in bending at the level of its flexible portion 1b.

[0034] Advantageously, the assembly means has a second portion 6b, in particular a second portion of a second diameter. This second portion is, for example, threaded and intended to be screwed into a tapped hole provided on the frame 99, for example on a barrel bridge M1. Preferably, when a watchmaker removes the assembly means, before it is completely removed, the assembly means is in its first position or configuration. In this first position, the pawl is in contact or bearing against the second portion, the pawl being elastically pulled against this second portion by its flexible portion. It follows that at least one tooth is pulled into an obstructing or interfering position with the teeth 2a, as shown in the figure. figure 1 On this figure 1 , screw 6 is completely removed.

[0035] The first and second portions are advantageously connected by a ramp, in particular by a truncated conical shape or a 6c chamfer.

[0036] Of course, screw 6 could be replaced by a pin inserted or machined from a blank, by an eccentric, or by any other means that ensures assembly. The pin could, for example, be a chamfered cylindrical pin, or even a tapered pin. More generally, any element protruding from the PLC module could fulfill the function of screw 6, such as a machined part of a blank that forms part of the PLC module, or any element attached to the PLC module.

[0037] Preferably, the activation and deactivation element and the pawl are arranged so that at least one tooth of the pawl is moved, relative to the wheel 2, along the plane of movement or along the plane of the wheel 2 when the activation and deactivation element moves from its first position to its second position or when the activation and deactivation element moves from its second position to its first position.

[0038] However, in a second variant of the first embodiment of the ratchet shown in the figure 7 The assembly means 6*, here a screw, has a parallel face 6e*, or a face substantially parallel to its cross-section, designed to bear against the pawl, particularly at an end close to at least one tooth 1a. The parallel face 6e* is designed to bear against the pawl so as to deform it elastically, in particular to deform the pawl elastically in bending, in the second configuration. Thus, in this second variant, the activation and deactivation element and the pawl are arranged such that at least one tooth of the pawl is displaced relative to the wheel 2, perpendicular to the plane of movement or perpendicular to the plane of the wheel 2, when the activation and deactivation element moves from its first position to its second position or when the activation and deactivation element moves from its second position to its first position.In this variant, the screw 6* is therefore preferentially positioned above the ratchet arm 1b.

[0039] A second embodiment of a 110' timepiece is described below with reference to the figure 8 A timepiece is, for example, a watch, in particular a wristwatch. A timepiece includes a mechanical watch movement, specifically an automatic watch movement.

[0040] The movement includes a ratchet system for a wheel 2 of the kinematic chain for winding the watch barrel 3, i.e. a ratchet system for immobilizing a wheel 2 of the kinematic chain for winding the watch barrel 3.

[0041] This second embodiment differs from the first embodiment in that it includes a second embodiment of a ratchet system 1'.

[0042] In the second embodiment, the ratchet 10' includes a mounting element 1c' for attaching to the frame 99 of the movement 100'. The mounting element is preferably located at one end of the ratchet. The mounting element includes, for example, a feature such as a heel 1c' with a hole for a shaft. In the second embodiment, the mounting element is a pivoting element designed to pivot the ratchet on the frame.

[0043] As in the first embodiment, the ratchet includes at least one tooth 1a' located at a distance from the assembly element. Preferably, the at least one tooth 1a' is arranged at a second end of the ratchet. In this embodiment, the at least one tooth has the shape of a jumper's beak.

[0044] Unlike the first embodiment, the ratchet includes a rigid portion 1d' between the pivoting element 1c' and at least one tooth 1a'. This portion has, for example, an elongated shape like an arm. This rigid portion does not deform, or hardly deforms, during the normal operation of the ratchet system.

[0045] Preferably, in the first activated configuration of the pawl, at least one tooth is brought into contact with the teeth 2a. In this first configuration, the pawl is constrained and presses at least one tooth against the teeth 2a. This constraint is obtained by an elastic arm 1b' of the pawl. In the first configuration, the elastic arm is deformed or pre-stressed against the activation and deactivation element 6', which is here a screw 6', in particular a screw 6' having a frustoconical portion designed to cooperate with the elastic arm 1b'. In this embodiment, the elastic arm 1b', acting as a spring, is formed as part of the rigid body 1d' of the pawl. Alternatively, the spring can also be attached separately. It can be arranged to bear directly or indirectly against the rigid body.

[0046] The pawl 1' is therefore monostable. Its first position is a position in which at least one tooth is brought into contact with the teeth 2a. Thus, this first position is a position in which at least one tooth cooperates by way of obstruction with the teeth 2a and therefore a position in which the pawl prevents the rotation of the wheel 2, in particular prevents the rotation of the wheel 2 in the direction of unwinding or unwinding the barrel spring.

[0047] A third embodiment of a 110" timepiece is described below with reference to the figure 9 A timepiece is, for example, a watch, specifically a wristwatch. A timepiece includes a mechanical watch movement, such as an automatic watch movement.

[0048] The movement includes a ratchet system for a wheel 2 of the kinematic chain for winding the watch barrel 3, i.e. a ratchet system for immobilizing a wheel 2 of the kinematic chain for winding the watch barrel 3.

[0049] This third embodiment differs from the first embodiment in that it comprises a third embodiment of a ratchet system 1".

[0050] In the third embodiment, the 10" ratchet differs from the ratchets of the first and second embodiments in that it is made of two components: the ratchet itself 10" and a separate spring 1b". The spring 1b" is arranged to apply force to the ratchet and return it to its first position.

[0051] As in the second embodiment, the ratchet includes a rigid portion 1d" between a pivoting element 1c" and at least one tooth 1a". This rigid portion does not deform or hardly deform during the normal operation of the ratchet system.

[0052] Preferably, in the first activated ratchet configuration, shown on the figure 9 At least one tooth is brought into contact with the teeth 2a. In this first configuration, the pawl is constrained and presses at least one tooth against the teeth 2a. This constraint is obtained by the action of the spring 1b. This first configuration is obtained in a first activation configuration or first activation position in which an activation and deactivation element (not shown) causes the pawl to be activated; that is, at least one tooth 1a of the pawl cooperates by way of resistance with the teeth 2a under the effect of a restoring force exerted by the pawl against the teeth 2a. For example, in this first activation configuration or first activation position, the activation and deactivation element does not act on the spring 1b.

[0053] For example, in a second deactivation configuration or a second deactivation position, the activation and deactivation element causes a deactivation of the pawl or a lesser activation of the pawl, that is to say that at least one tooth 1a" of the pawl does not cooperate with the teeth 2a or that a return force of at least one tooth 1a" of the pawl against the teeth 2a is reduced.

[0054] In all the embodiments and variations described, wheel 2 is a barrel ratchet. However, wheel 2 can also be any other wheel in the barrel winding chain, including the automatic or manual winding chain. The wheel could also be part of another chain that engages with the barrel.

[0055] In all the embodiments and variants described, if the activation and deactivation element is a mounting screw of the PLC module, when the screw is unscrewed during disassembly of the PLC module, the ratchet moves from the second configuration to the first configuration in which at least one tooth 1a, 1a', 1a" of the ratchet is engaged with the teeth 2a, in particular under the effect of a spring.

[0056] In all the embodiments and variants described, the on / off element is a means of assembly. Alternatively, the on / off element may have any other function. The on / off element may also be dedicated solely to the function of on / off. The on / off element may, for example, include an eccentric.

[0057] In all the described embodiments and variants, the stiffness of the ratchet spring can be inhibited so as to significantly minimize the resistive torque of the ratchet during the operation of the automated device. In such a configuration, the ratchet is preferably a jumper 1' as in the second embodiment.

[0058] In all the embodiments and variants described, the pawl is monostable. Thus, it retracts from the teeth 2a against a pre-wound spring during retraction. The elastic stiffness of the spring can also be inhibited. Resetting or rewinding the spring causes the pawl to return to its initial position.

[0059] Alternatively, the ratchet can take the form of a bistable toggle, that is, a toggle with two stable positions defined, for example, by flexible structures, such as the buckling of one or more flexible blades. In such a configuration, the state of the toggle in its first or second position is controlled by the state of the activation and deactivation element.

[0060] As seen previously, the ratchet can be a single-piece component as illustrated in the figures 1, 2 , 7 et 8 or perhaps an assembly such as illustrated by the figure 9 The ratchet can also be a rigid component returned elastically by a spring, as illustrated in the... figures 8 And 9 .

[0061] As previously mentioned, the pawl is designed to cooperate directly with a ratchet wheel 2. By "directly," we mean that the pawl is preferably designed to engage with the teeth of the ratchet. Alternatively, the pawl can cooperate with the teeth of another gear in the manual winding chain of the movement, which is engaged with the ratchet wheel. The pawl can, for example, cooperate with the crown wheel, which is engaged with the ratchet wheel. In such a case, the operating principle remains unchanged. Alternatively still, the crown wheel or any other gear in the manual winding chain that is indexed by such a pawl can have a degree of freedom so that it can be disengaged from the ratchet teeth by the automaton module, and more specifically by the assembly means of the automaton module. For this purpose, such a gear could, for example, be pivoted by an olive tenon or by a rocker.

[0062] Regardless of the embodiment, the pawl is positioned in its initial configuration as soon as the oscillating weight is removed, preferably just before the oscillating weight is removed. This prevents any risk of the mainspring unwinding unintentionally. Preferably, the automaton module M' is designed so that the oscillating weight cannot be removed from the movement before the module is removed, and in particular before a screw whose state controls the pawl's position is unscrewed. Preferably, in a particular construction, a screw 7 allowing the mounting and dismounting of the oscillating weight 5 is inaccessible when the automaton module M' is assembled onto the movement. The screw 7 is, for example, assembled from the underside of the automaton module M' as illustrated in the figure 10 .

[0063] Advantageously, the self-winding watch movement has the unique feature of a pawl that can be disengaged or activated and deactivated depending on the movement's configuration. This allows the pawl's function to be inhibited when the self-winding mechanism is engaged and activated when the mechanism is removed from the movement. Consequently, during the operation of the automatic winding mechanism, the oscillating weight does not have to overcome the resistive torque induced by the pawl, and in particular the pawl spring, to allow the mainspring to wind automatically. This solution is particularly advantageous due to its simplicity and the expected performance gains.

[0064] In a preferred embodiment, the self-winding movement has the particularity of being equipped with a ratchet that can be activated and deactivated depending on the mounting state of an M' module of an automaton.

[0065] In the initial configuration or assembly state of the movement, corresponding to the watch movement without the automaton module, the pawl is activated to immobilize the ratchet wheel in the direction of unwinding the mainspring. During operation of the movement without the automaton module, the pawl retracts during winding but is immediately returned to an interlocking position with a gear tooth to prevent any movement of the teeth in the direction of unwinding the mainspring.

[0066] In a second configuration or assembly state of the movement, corresponding to the clockwork movement equipped with the automaton module, the pawl is deactivated to avoid interference with the gear teeth. For example, at least one tooth of the pawl is out of range of the gear teeth so as not to create opposition to the movement of the oscillating weight during operation of the automaton module.

[0067] In this particular construction, the automaton module M', specifically the means for mounting the automaton module to the movement, controls the state of the ratchet pawl to configure it in its activated or deactivated state. For example, as previously discussed, a screw for mounting the automaton module to the movement may have a specific shape that allows it to move, or cause to move, the pawl during the assembly and disassembly of the automaton module M', particularly within the plane of the movement frame. To this end, the screw 6 may have, as previously discussed, a portion of its body 6a shaped to come into contact with the pawl when the screw 6 is tightened onto the rest of the movement M, specifically onto a barrel bridge M1.Preferably, the screw 6 has at least two distinct portions 6a, 6b separated by a chamfer 6c, such that the chamfer forms a ramp to allow the pawl to move, and thus to move at least one tooth 1a, 1a', 1a" away from the teeth 2a, when the screw 6 is tightened. Thus, at the beginning of the screw 6's tightening, the pawl is in a first configuration, and at the end of the screw 6's tightening, the pawl is in a second configuration. Advantageously, in the second configuration of the activation and deactivation element 6, the barrel spring is kept under tension by the automaton.

[0068] The various embodiments relate to a self-winding movement, which is characterized by a pawl that can be disengaged or deactivated depending on the assembly state of an automaton module M'. More generally, a self-winding watch movement is characterized by a pawl that can be activated and deactivated depending on the assembly state of the watch movement, particularly during casing. For example, the pawl can be deactivated during the final assembly of the movement within a watch case. The pawl can, for instance, be deactivated by a case component such as the case back. For example, the case back can be fitted with a pin designed to engage with the pawl so that the pawl is retracted from a ratchet wheel tooth once the case back is assembled.This design also allows the pawl to be inhibited or deactivated when the automatic winding mechanism is activated, and ensures that the pawl is activated when the automaton is removed from the movement, once the movement has been disassembled. This design is particularly well-suited to a movement with an oscillating weight that does not cover the entire movement, for example, a micro-rotor movement.

[0069] Optionally, such a device can also be controlled by an additional command, for example, by the stem of the watch movement. Thus, the on / off element can be changed state by a related device, which is preferably activated by a mechanism on the stem of the watch movement. For example, the on / off element may have an elastic structure or an additional degree of freedom so that it can retract.

[0070] Advantageously, a watch movement as described above or a timepiece as described above is configured by implementing at least one of the following steps: Acting on the activation and deactivation element of the pawl so as to place it in a first configuration in which at least one tooth of the pawl cooperates, in particular by obstruction with the teeth and / or under the effect of a return force of at least one tooth of the pawl against the teeth, Acting on the activation and deactivation element of the pawl so as to place it in a second configuration in which at least one tooth of the pawl does not cooperate with the teeth or in which a return force of at least one tooth of the pawl against the teeth is reduced, in particular reduced compared to the return force of at least one tooth 1a of the pawl against the teeth 2a in the first configuration.

[0071] Preferably, the first step mentioned above is implemented during a process of dismantling the watch movement or the watch part.

[0072] Preferably, the second step mentioned above is implemented during a process of assembling the watch movement or the watch part.

Claims

1. A pawl system (1; 1'; 1") for a wheel (2) of a drivetrain for winding a horology barrel (3), comprising: - a pawl (10; 10'; 10") having at least one tooth (1a; 1a'; 1a") intended to collaborate with a toothset (2a) of the wheel (2); and - an element (6; 6') for activating and deactivating the pawl; the activation and deactivation element being arranged in such a way that, when the activation and deactivation element is in a first configuration, the at least one tooth (1a; 1a'; 1a") of the pawl collaborates with the toothset (2a) directly or indirectly, notably under the effect of a return force returning the at least one tooth (1a; 1a'; 1a") of the pawl against the toothset (2a), and, when the activation and deactivation element is in a second configuration, the at least one tooth (1a; 1a'; 1a") of the pawl does not collaborate with the toothset (2a), in the second configuration of the activation and deactivation element, the at least one tooth is some distance away from the toothset (2a).

2. The system as claimed in the preceding claim, wherein the wheel (2) is a ratchet (2).

3. The system as claimed in one of the preceding claims, wherein the pawl (10; 10') comprises an assembly element (1c; 1c') for assembly to a frame (99) of a movement (100, 100', 100"), notably to a first end of the pawl, and wherein the pawl comprises the at least one tooth (1a; 1a'; 1a") some distance away from the assembly element, notably at a second end of the pawl.

4. The system as claimed in the preceding claim, wherein the pawl comprises a flexible portion (1b) between the assembly element and the at least one tooth.

5. The system as claimed in claim 3 or 4, wherein the assembly element is an element for fixing the pawl to a frame (99) of a movement (100, 100', 100").

6. The system as claimed in claim 3, wherein the pawl comprises a rigid body (1d'; 1d"), wherein the assembly element (1c'; 1c") is a pivot element and wherein the pawl comprises a return spring (1b'; 1b") for returning the at least one tooth (1a; 1a'; 1a") of the pawl against the toothset (2a).

7. The system as claimed in the preceding claim, wherein the spring is formed as one with the rigid body or is an attached spring bearing directly or indirectly against the rigid body.

8. The system as claimed in one of the preceding claims, wherein the activation and deactivation element is an assembly means (6; 6'), notably a screw (6; 6') or a pin or an eccentric.

9. The system as claimed in one of claims 1 to 7, wherein the activation and deactivation element is an eccentric.

10. The system as claimed in claim 8 or 9, wherein the activation and deactivation element has a portion or a face parallel or substantially parallel to its cross section intended to come to bear against the pawl, notably intended to deform the pawl elastically, notably to deform the pawl elastically in bending, in the second configuration.

11. A watch movement (100; 100'; 100"), notably an automatic watch movement, comprising a pawl system as claimed in one of the preceding claims.

12. The watch movement as claimed in the preceding claim, wherein said movement comprises a part (M') of a drivetrain for automatically winding a time piece barrel (3), the drivetrain part comprising at least an oscillating mass (5) the mechanical energy of which is used to wind the barrel, notably a modular part of the drivetrain (M'), and a pawl system as claimed in one of claims 1 to 10, the activation and deactivation element being a means of assembly of the drivetrain part, notably a means of assembly of the modular part of the drivetrain, onto a movement-blank, particularly the means of assembly being a mounting screw for mounting the a modular part of the drivetrain.

13. The movement as claimed in claim 11 or 12, wherein the mainspring (3) is kept under tension under the effect of the drivetrain part in the second configuration of the activation and deactivation element.

14. The movement as claimed in one of claims 11 to 13, wherein the modular drivetrain part is a module fitted with reversing wheels.

15. The movement as claimed in one of claims 11 to 14, wherein the pawl (10; 10') comprises an assembly element (1c; 1c') for assembly to a frame (99) of the movement, notably at a first end of the pawl, and wherein the pawl comprises the at least one tooth (1a; 1a'; 1a") some distance away from the assembly element, notably at a second end of the pawl.

16. A timepiece (110; 110'; 110"), notably a wristwatch, comprising a system as claimed in one of claims 1 to 10 or a movement as claimed in one of claims 11 to 15.

17. The timepiece as claimed in the preceding claim, wherein the activation and deactivation element is a means of assembly of the timepiece, notably a means of assembly of the movement within the timepiece.

18. A method for configuring a horology movement as claimed in one of claims 11 to 15 or a timepiece as claimed in either of claims 16 and 17, the method comprising: - action on the pawl activation and deactivation element so as to place it in a first configuration in which the at least one tooth of the pawl collaborates directly or indirectly with the toothset, notably by obstacle and / or under the effect of a return force returning the at least one tooth of the pawl against the toothset, and / or - action on the pawl activation and deactivation element so as to place it in a second configuration in which the at least one tooth of the pawl does not collaborate with the toothset or in which a return force returning the at least one tooth of the pawl against the toothset is reduced.

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