Movement comprising a ringing device

Abstract

The clock movement includes a striking device (4) having an anti-rebound device (5) arranged so that each strike of the gong (10) by the hammer (6) is followed by a single rebound which is partial, so that the hammer does not touch the vibrating gong as a result of the strike, so as not to impair the quality of the sound which is produced by the strike.The anti-rebound device is arranged so that it can be alternatively: - in a first configuration, in which the anti-rebound device stops a rotation of the hammer body, in a first direction of rotation of this body towards the snare, starting at least at a first intermediate position between the rest position and an extreme position, in which the hammer is loaded, before said body can touch the snare, and - in a second configuration, in which the anti-rebound device neither stops nor slows down a rotation of the hammer, in the first direction of rotation, between the extreme position of said body and a position of contact with the snare, insofar as the anti-rebound device is in this second configuration when the body passes through a second intermediate position located between a rest position and the extreme position.

Description

Domaine technique de l'invention

[0001] The present invention relates to a clock movement comprising a striking device, which is classically formed by a hammer, a bell, a drive spring for the body of the hammer to perform each strike, and a hammer actuating mechanism capable of cocking the hammer before each strike. Arrière-plan technologique

[0002] Watch movements incorporating a striking mechanism have been known for a long time. This horological complication requires considerable watchmaking expertise. A well-known technical problem is the damping of the hammer after a strike, in order to reduce the number and amplitude of rebounds. However, regardless of the known solution, even a single, relatively small rebound creates a problem because such a rebound quickly disrupts the resonating / vibrating gong. In particular, a full rebound can muffle the sound produced by a strike, especially if the striking stylus strikes the gong again out of phase with the gong's transverse movement. This is audible to the wearer and therefore detracts from the gong's sound quality and the intensity of the emitted sound.

[0003] To dampen the hammer after it strikes and limit rebounds, a classic bell-ringing mechanism includes a counter-spring which, as its name suggests, acts on the hammer at the end of its travel towards the gong, significantly slowing it down by opposing its movement towards the gong, a movement generated by a drive spring. This counter-spring is designed with high stiffness and is arranged so that the final phase is relatively short, thus preventing an excessive reduction in the hammer's kinetic energy before it strikes the gong. However, the counter-spring must act on the hammer early enough to avoid multiple rebounds and, ideally, to result in only a single partial rebound. It should be noted that the counter-spring defines the hammer's resting position, which leaves the striking face relatively close to the gong without actually touching it, whether it is vibrating or not.Thus, assembling and adjusting the counterspring configuration in the striking device is a difficult operation that can take a lot of time, even for an experienced watchmaker.

[0004] Another major drawback of the counter-spring is that it reduces the amount of energy that can be transmitted to the bell by the hammer by strongly resisting its movement in the final phase. This lost mechanical energy therefore reduces the efficiency of the striking mechanism, which loses a certain amount of mechanical energy before each strike.

[0005] In this text, the term 'strike' refers to the brief moment when the hammer strikes the gong, usually near its anchor point, after being cocked, and during which the hammer's body imparts mechanical energy to the gong. The term 'rebound' refers to the hammer's return movement after a strike, followed by a movement where the body rebounds towards the gong until it makes contact again. Thus, 'partial rebound' refers to a rebound of the hammer's body that undergoes a return movement but does not subsequently come into contact with the gong because it is stopped before such contact can occur. Résumé de l'invention

[0006] The invention aims to provide a solution to the aforementioned problems of the prior art. In particular, the invention aims to provide a clock movement equipped with a striking device whose hammer, after striking, performs only a single partial rebound, i.e., no full rebound, without slowing down the body of the hammer during the journey between an extreme position (hammer in a loaded state) and the position of contact with the gong (position at which the striking beak comes into contact with the gong during the strike), and consuming little mechanical energy, preferably almost no energy, from the energy source associated with the striking device.Thus, it is planned to propose a ringing device that can have maximum efficiency between the mechanical energy supplied to the hammer actuation mechanism, which arms the hammer before each strike, and the energy transmitted by the hammer to the snare, while allowing for a very good sound quality of the snare and in particular a vibration of the snare not dampened by a rebound.

[0007] To this end, the invention relates to a movement incorporating a striking device comprising a bell, a hammer mounted to rotate freely about a first axis of rotation, and a spring for driving the hammer's rotation. The hammer has a body with a striking beak arranged in a region distant from the first axis of rotation, and the drive spring is arranged to apply a driving force to the hammer body so as to induce its rotation in a first direction that brings the striking beak closer to the bell, allowing the bell to be struck by the striking beak.The striking device includes a hammer-actuating mechanism capable of cocking the hammer from a rest position of the hammer body, in which the striking beak is separated from the gong, by rotating this body in a second direction, opposite to the first, to an extreme position of said body, so as to constrain the drive spring, and then to release the hammer so that it can strike the gong under the action of the drive force. Remarkably, the striking device includes an anti-rebound device arranged so as to be able to be alternatively: . in a first configuration, in which the anti-rebound device stops a movement of the hammer body in the first direction of rotation, starting at least at a first intermediate position between the rest position and the extreme position of this body, before the striking beak can touch the gong, whether the latter is vibrating or non-vibrating, and in a second configuration, different from the first configuration, in which the anti-rebound device does not stop a rotation of the hammer, in the first direction of rotation, between the extreme position of said body and a contact position, at which the striking beak reaches the gong, insofar as the anti-rebound device is in this second configuration when said body passes through a second intermediate position between the rest position and the extreme position;the anti-rebound device not braking the hammer body at least between the second intermediate position and the contact position, preferably between the extreme position and the contact position. ;

[0008] The striking mechanism is arranged so that the hammer body, immediately after each strike, undergoes a return movement, rising at least to the first intermediate position without reaching the extreme position. This striking mechanism is arranged so that the anti-rebound device is: maintained in the first configuration when the hammer is at rest and said body is therefore in the rest position; put into the second configuration each time the hammer is cocked by the actuation mechanism or following the release of the hammer before the body of said hammer reaches the second intermediate position; then returned to the first configuration during the return movement of said body; and then remains in the first configuration until the hammer is again at rest or again cocked by the actuation mechanism; said body thus undergoing a single, partial rebound after each strike.

[0009] In a main embodiment, the anti-rebound device comprises an anti-rebound part, mounted for rotation on the body of the hammer about a second axis of rotation, and a first stop mounted on a support of the hammer and arranged such that: when the anti-rebound part is, during a passage of said body through the second intermediate position, in a second position or second range of positions relative to the body of the hammer and the anti-rebound device is thus in the second configuration, the anti-rebound part does not come into contact with the first stop during the rotation of said body between the extreme position and the contact position; when the anti-rebound part is in a first position or first range of positions relative to the body of the hammer and the anti-rebound device is thus in the first configuration, the body of the hammer is stopped by the anti-rebound part coming to rest against the first stop during a rotation in said first direction beginning at least at the first intermediate position and before the extreme position; and when the hammer is at rest, the anti-rebound part is in contact with the first stop.

[0010] In a general embodiment, the anti-rebound part has a center of mass, which is distant from the second axis of rotation, and presents a contact surface with the first stop, this contact surface being configured to stop the body of the hammer, when the anti-rebound device is in the first configuration, during said rotation of the body in said first direction, starting at least at the first intermediate position, by coming to rest against the first stop and to maintain said body in the rest position when the hammer is at rest.

[0011] In a first embodiment, the anti-rebound device is arranged so that the passage of the anti-rebound part from said first position or first range of positions to said second position or second range of positions takes place, when the hammer is cocked by the actuation mechanism, during the rotation of said body between a maximum position for said return movement and the extreme position.

[0012] In a second embodiment, the anti-rebound device is arranged such that the transition of the anti-rebound portion from said first position or first range of positions to said second position or second range of positions occurs after the release of the hammer and before the body of this hammer reaches the second intermediate position. The anti-rebound portion is arranged such that, in the first position or first range of positions, said center of mass is at a distance from a geometric line passing through the second axis of rotation and orthogonal to a line connecting the first axis of rotation and the second axis of rotation, the anti-rebound portion experiencing, relative to said body, a first apparent torque due to an acceleration experienced by said body, and therefore the anti-rebound portion at the level of the second axis of rotation, generated by said driving force on this body by the drive spring.The anti-rebound device is arranged so that the first apparent torque causes the anti-rebound part to rotate to the second position or second range of positions and remains in this second position or second range of positions until the contact surface of the anti-rebound part has passed the first stop during the rotation of the body between the extreme position and the contact position.

[0013] In an advantageous embodiment, the transition of the anti-rebound portion from said second position or second range of positions to said first position or first range of positions is triggered by the striking of the gong by the hammer body, the anti-rebound portion being arranged such that, in the second position or second range of positions, said center of mass is distant from a geometric line passing through the second axis of rotation and orthogonal to a line connecting the first axis of rotation and the second axis of rotation, the anti-rebound portion undergoing, relative to said body, a second apparent torque due to a reaction force of the gong experienced by this body, and therefore the anti-rebound portion at the level of the second axis of rotation, when the striking face comes to rest against the gong,the anti-rebound device being arranged so that the second apparent torque causes a rotation of the anti-rebound part to the first position or first range of positions, in which it remains during said return movement of said body. Brève description des figures

[0014] The invention will be described in more detail below with reference to the accompanying drawings, given by way of non-limiting examples, in which: there Figure 1 shows a partial plan view of a clock movement equipped with a striking device according to a first embodiment of the invention; Figures 2a has 2h show various successive states of the ringing device of the Figure 1 during the cocking of the hammer followed by striking the gong until the hammer returns to its resting position; the Figure 3 shows a partial plan view of a clock movement equipped with a striking device according to a second embodiment of the invention; Figures 4a has 4g show various successive states of the ringing device of the Figure 3 during the cocking of the hammer followed by the striking of the gong until the hammer returns to its rest position, corresponding to the state shown in the Figure 3 ; there Figure 5 is a schematic representation of various phases occurring during the process of generating a strike on the snare and the single partial rebound following the strike; The Figures 6, 7 et 8 show three variants of the first embodiment. Description détaillée de l'invention

[0015] With reference to Figures 1 And 2a has 2hA first embodiment of a watch movement according to the invention will be described below. We will begin by describing a principal embodiment of the invention, encompassing the first embodiment and the second embodiment, which will be described in detail later, with reference to the figures 1 has 2h which relates to the first embodiment (for the sake of clarity, the second embodiment will be presented only after the first). The principal embodiment is a preferred embodiment within the general scope of the invention as defined by the general features of claim 1, which are also set out below with references to the figures relating to the first embodiment (for the sake of clarity).

[0016] In general, the movement 2 incorporates a striking device 4 comprising a bell 10, a hammer 6 mounted to rotate about a first axis of rotation 14, and a spring 12 for driving the hammer's rotation. The hammer 6 has a body 8 with a striking beak 9 arranged in a zone distant from the first axis of rotation 14. The striking device 4 conventionally includes a hammer-actuating mechanism capable of cocking the hammer from a rest position ( Figure 1 ) of the hammer body, in which the striking beak 9 is separated from the gong 10, by rotating this body in a second direction, opposite to the first direction, until an extreme position of said body ( Figure 2a ), so as to constrain the drive spring 12, and then to release the hammer so that this hammer can strike the gong under the action of the drive force. Note that the actuation mechanism is not shown in the figures. The drive spring 12 is arranged to be able to apply a drive force FE on the body 8 of the hammer 6, by pressing for example against a pin 16 fixed to the body, so as to generate the rotation of the body 8 in a first direction which brings the striking beak 9 closer to the gong 10 ( Figure 2b ) and allows this stamp to be struck by the striking nozzle ( Figure 2c ).

[0017] According to the invention, the ringing device 4 generally comprises an anti-bounce device 5, which will be described in detail later, arranged so as to be able to be alternatively: in a first configuration (represented in particular in Figures 2f, 2g, 2h ), wherein the anti-rebound device 5 stops a movement of the body 8 of the hammer 6 in the first direction of rotation, starting at least at a first intermediate position (approximately Fig. 2g ) located between the resting position ( Fig. 1 ) and the extreme position ( Fig. 2a ) of this body, before the striking beak 9 can touch the gong 10, whether the latter is vibrating or non-vibrating, and in a second configuration (represented in particular in Figures 2a et 2b ), different from the first configuration, in which the anti-rebound device 5 does not stop a rotation of the hammer 6, in the first direction of rotation, between the extreme position and a contact position of the body 8 where the striking beak reaches the snare 10 ( Fig. 2c ), insofar as the anti-rebound device is in this second configuration when body 8 passes through a second intermediate position (approximately Fig. 2b ) located between the rest position and the extreme position; the anti-rebound device 5 not braking the body 8 of the hammer 6 at least between the second intermediate position and the contact position, preferably between the extreme position and the contact position.

[0018] The ringing device 4 is arranged so that the body 8 of the hammer 6 undergoes a return movement after each strike ( Figures 2d , 2e ) by rising at least to the first intermediate position without reaching the extreme position. Note that the body never reaches the extreme position during the return movement, because it transmits a significant portion of its mechanical energy to the gong during striking. Furthermore, the striking mechanism is arranged so that the anti-bounce device 5 is: maintained in the first configuration when the hammer 6 is at rest and the body 8 is therefore in the rest position; put into the second configuration, each time the hammer is cocked by the actuation mechanism (first embodiment) or following the release of the hammer before the body 8 reaches the second intermediate position (second embodiment which will be described in detail later); then returned to the first configuration during said return movement of the body 8; and then remains in the first configuration until the hammer is again at rest or again cocked by the actuation mechanism.

[0019] Thanks to the general features of the invention, the body 8 undergoes only one rebound, which is partial, following each strike. This is a very remarkable result, and the main features for achieving it will be described below.

[0020] In the main embodiment, encompassing the first embodiment and the second embodiment (the latter will be described in more detail later, and references to the figures of this second embodiment are not given here so as not to detract from the clarity of the presentation), the anti-rebound device 5 comprises an anti-rebound part 20, mounted for rotation on the body 8 of the hammer 6 about a second axis of rotation 22, and a first stop 33 mounted on a support of the hammer (plate 3 in the figures) and arranged such that: when the anti-rebound part 20 is, during said passage of the body 8 of the hammer 6 through the second intermediate position ( Fig. 2b ), in a second position ( Figures 2a has 2c) or second range of positions relative to said body 8 and the anti-rebound device 5 is thus in the second configuration, the anti-rebound part 20 does not come into contact with the first stop 33 during the rotation of the body 8 between the extreme position ( Fig. 2a ) and the contact position ( Fig. 2c ) ; when the anti-bounce part 20 is in a first position ( Figures 2f has 2h ) or first range of positions relative to the body 8 of the hammer and the anti-rebound device 5 is thus in the first configuration, the body 8 of the hammer 6 is stopped by the anti-rebound part 20 coming to rest against the first stop 33 during a rotation in said first direction beginning at least at the first intermediate position ( Fig. 2g ) but below the extreme position; and when the hammer 6 is at rest, the anti-rebound part 20 is in contact with the first stop 33.

[0021] The main embodiment is further characterized by the fact that the anti-rebound device 5 includes a flexible element 24 which is fixed on the body 8 of the hammer 6 and arranged to interact with the anti-rebound part 20.

[0022] In a first principal variant of the first embodiment of a watch movement 2 according to the invention, the flexible element 24 of the anti-rebound device 5 is fixed to the body 8 and includes a portion defining a recess 26, oriented non-tangentially with respect to the second axis of rotation 22 and preferably angularly closer to a radial line passing through a point at the bottom of the recess than to a tangential line passing through that point. The recess 26 defines a stable position for the anti-rebound portion 20, which includes a pin 28 that forms a bearing portion for the flexible element, this pin having an axial surface against which the flexible element can press. In one variant, the bearing portion may be a projecting portion formed from the base plate of the anti-rebound portion.In another variant, the bearing part can be a part of the base plate whose lateral surface defines an axial bearing surface for the flexible element, which is then arranged in the same general plane as the base plate.

[0023] The pin 28 is arranged so that it can be housed at least partially in the recess 26, substantially without play, when the anti-rebound portion 20 is in the stable position defined by this recess, and so that it can elastically move this portion of the flexible element, under the action of a torque that the anti-rebound portion can experience, to exit the recess. Indeed, in two specific phases during the sound generation process by the ringing device 4, a torque is applied to the anti-rebound portion with an intensity that respectively allows this anti-rebound portion to move from the first position or range of positions to the second position or range of positions, and vice versa. It should be noted that the torque has a direction opposite to that of the torque during the vice versa.It should also be noted that the intensity of the torque generally differs depending on its direction in the sound generation process. The orientation of the hollow 26 is defined overall by a median line between its two flanks, which rise from the bottom of this hollow.

[0024] In the variant shown in the figures, the flexible element 24 is formed by a spring wire extending in a geometric plane. It has a first, substantially straight, elastic portion and a second portion, at its free end, with bends followed by oblique segments, this second portion being less elastic than the first. In particular, the recess 26 has a V-shape defined by two oblique segments of the spring wire. In the first main variant, the anti-rebound portion is in said first position or said second position when it is in said stable position defined by the recess of the flexible element.Next, said portion of the flexible element is configured such that, when the hollow defines the first position, the anti-rebound portion 20 can be brought into the second position or second range of positions under the action of said torque, and when the hollow defines the second position, the anti-rebound portion can be brought into the first position or first range of positions under the action of said torque. In the variant shown in the figures, the hollow 26 defines said second position.

[0025] Two variants will be described below. In a first particular variant represented at the Figure 6 said portion of the flexible element is a first portion and said hollow 26 is a first hollow. In the anti-rebound device 5a, the flexible element 24a, mounted on the body 8 of the hammer 7, includes a second portion defining a second hollow 27 having a non-tangential orientation relative to the second axis of rotation 22, preferably angularly closer to a radial line passing through a point at the bottom of the second hollow than to a tangential line passing through this point.The second recess 27 defines a second stable position for the anti-rebound portion. The flexible element 24a is arranged so that the pin 28 can be housed at least partially in the second recess, substantially without play, when the anti-rebound portion 20 is in the second stable position. The pin can elastically displace the second portion of the flexible element under the action of a second torque, opposite to the torque that the anti-rebound portion can experience to exit the second recess 27. The first recess 26 defines the first position of the anti-rebound portion, and the second recess 27 defines the second position of this anti-rebound portion when the pin 28 is housed alternately in the first recess 26 and in the second recess 27. The second portion of the flexible element is configured so that the anti-rebound portion 20 can be brought into the first position under the action of the second torque.As already mentioned, the first couple of forces and the second couple of forces appear during the process of generating a sound by the ringing device of the invention.

[0026] In a second particular variant of the anti-rebound device 5b, shown in the Figure 7 The flexible element 24b includes a recess 27a configured such that it presents a flank 27b forming a stop for the pin 28, according to a direction of rotation of the anti-rebound portion that is opposite to the direction of rotation allowing the anti-rebound portion 20 to move, when the recess 27a defines the first position or first range of positions, into the second position or second range of positions (general case), or alternatively, when the recess defines the second position or second range of positions, into the first position or first range of positions. This stop flank 27b limits the angular travel of the anti-rebound portion 20 by opposing the torque that allows the pin 28 to move into the recess during a transition from one position of the anti-rebound portion to the other position.This variant avoids the need to add a pin or other protruding part to the body 8 of the hammer 6b to prevent the anti-rebound section from rotating under the force of the torque that causes the anti-rebound section to move from its second to its first position. This torque can be very high. Therefore, this first variant is particularly advantageous when the recess defines the first position of the anti-rebound section, as shown in Figure 1. Figure 7 .

[0027] In a second main variant, the anti-rebound device comprises a flexible element 24 which is fixed to the body 8 and which has a segment 25 capable of exerting a restoring force, generated by the constrained flexible element, on the pin 28, which is part of the anti-rebound portion 20, in a tangential direction relative to the second axis of rotation 22 and thus causing the anti-rebound portion to rotate in the tangential direction. The body 8 comprises a second stop 30 which is arranged so as to be able to stop a rotation of the anti-rebound portion, in the tangential direction, in said first position ( Figure 1 ) or, alternatively, in said second position of the anti-rebound part 20. Preferably, the flexible element 24 is arranged so that the segment 25 exerts the restoring force on the pin 28 to return the anti-rebound part to the first position or alternatively to the second position, defined by the second stop, and also when the anti-rebound part is in this first position ( Figure 1 ), respectively in the second position, so as to have a first or second position which is relatively stable.

[0028] In a third particular variant encompassed by the second main variant and represented at the Figure 8 , said segment 25 is a first segment and said restoring force is a first restoring force. The anti-rebound device 5c comprises a flexible element 24c having a second segment 25a capable of exerting a second restoring force on the pin 28 in a second tangential direction, opposite to said tangential direction, and thus causing the anti-rebound part 20 to rotate in the direction of the second tangential direction, the body 8 of the hammer 6c having a third stop 31 which is arranged so as to be able to stop a rotation of the anti-rebound part, in said direction of the second tangential direction, in said second position ( Fig. 8 ), respectively in said first position of the anti-rebound part. Preferably, the flexible element 24c is arranged so that the second segment 25a exerts the second restoring force on the pin to return the anti-rebound part to the second position or the first position, defined by the third stop, and also when the anti-rebound part is in this second position, respectively in this first position.

[0029] An advantageous variant of the first embodiment combines the first and second main variants mentioned above and encompasses the variant shown in the Figure 1 The flexible element 24 has a segment 25 capable of exerting a restoring force, generated by this constrained flexible element, on the pin 28 in a tangential direction relative to the second axis of rotation 22, the body 8 having a second stop 30 which is arranged so as to be able to stop a rotation of the anti-rebound part 20, in the direction of said tangential direction, in said first position of this anti-rebound part when the recess 26 defines the second position ( Figure 1 Alternatively, in said second position when the recess defines said first position. Preferably, the flexible element 24 is arranged so that the segment 25 continues to exert the restoring force on the pin 28 when the anti-rebound part is in said first position, respectively in said second position. In this case, said first position, respectively said second position, is a stable position for the anti-rebound part. Otherwise, said segment and the second stop define said first range of positions, respectively said second range of positions for the anti-rebound part. In the variant shown, the second stop 30 defines the first position of the anti-rebound part 20, given that the recess 26 defines the second position of this anti-rebound part, the first and second positions being stable positions.

[0030] In a preferred variant of the first embodiment and also of the second embodiment which will be described later, the anti-rebound part 20 has a center of mass CM which is distant from the second axis of rotation 22 and it has a protruding part 21 defining a contact surface 21a with the first stop 33, this contact surface being configured to stop the body 8 of the hammer 6, when the hammer is in the first configuration during said rotation in said first direction starting at least at the first intermediate position, by coming to butt against the first stop 33, before the striking beak touches the snare 10, and to maintain the body in the rest position when the hammer is at rest.

[0031] To return to the advantageous variant of the Figure 1 We will further describe certain particular characteristics of this variant with reference to Figures 1 And 2a has 2hThe first stop 33 is movable, as it is carried by a flexible blade 32 and configured so that it can retract momentarily, during the return movement of the body 8 during the single partial rebound after a strike, under the action of the anti-rebound part 20 which presses momentarily against the first stop ( Fig. 2e A pin 34, fixed in the plate 3, serves to hold the flexible blade 32 in a predetermined position when no force is exerted on this flexible blade. Preferably, the flexible blade is slightly constrained when it rests against the pin 34. The first stop 33 is formed here by a terminal segment of the flexible blade following a bend located on the side of its free end, this terminal segment preferably having an angle with a substantially straight section that is less than 90°. When the hammer 6 is at rest, as shown in the figure 1 , the body 8 of the hammer is in its rest position and the anti-rebound part 20 is in said first position, this anti-rebound part then being in contact with the stop 30 which defines this first position.

[0032] According to a first main feature of the first embodiment, the anti-rebound device 5 is arranged so that the passage of the anti-rebound part 20 from said first position or first range of positions (anti-rebound device in its first configuration, which corresponds to a first configuration of the hammer 6 in the variant shown) to said second position or second range of positions (anti-rebound device in its second configuration, which corresponds to a second configuration of the hammer 6 in the variant shown) takes place, when the hammer is being cocked by the actuation mechanism, during the rotation of said body between a maximum position for said return movement and the extreme position.In the variant shown, the anti-rebound part 20 moves from the first position (stable position defined by the segment 25 of the wire spring 24 and the pin 30 defining the second stop) to the second position (stable position defined by the V-shaped hollow 26 formed by the terminal part of the wire spring 24) in a terminal phase of the hammer winding during which the protruding part 21 of the anti-rebound part 20 comes to rest against a pin 38 fixed in the plate 3 and is then subjected to a torque, in the opposite direction to the torque that the body 8 experiences during the winding of the hammer, which allows this anti-rebound part to overcome the torque generated by the restoring force exerted by the segment 25 of the flexible element 24 on the anti-rebound part and thus to move from the first position to the second position, as shown in the figure. Figure 2a .

[0033] Once the hammer 6 is fully cocked with the anti-rebound section in approximately the second stable position, the hammer is released and subjected to a driving force FE from the drive spring 12, which presses against the pin 16 of the hammer body 8. The hammer 6 accelerates until it reaches the gong 10 with relatively high kinetic energy and transmits some, preferably most, of this energy to the gong to excite it and cause it to vibrate, emitting the desired sound. In the second position, the hammer 6 is neither stopped nor braked between the extreme position, in which the hammer is fully cocked, and the contact position where the striking face 9 touches the gong 10, shown in the figure. Figure 2c This is remarkable and very advantageous. As can be seen in the Figure 2b The hammer 6, in particular its body 8, is neither disturbed nor slowed down as the projecting part 21 of the anti-rebound part 20 passes the first stop 33, while the hammer body undergoes a rotation towards the snare (defining a first direction of rotation) and the anti-rebound part is in its second position, and the anti-rebound device is thus in its second configuration. The anti-rebound part does not touch the first stop 33 during this rotation between the extreme position of the body and the position of contact with the snare. Figure 2b shows the body of the hammer 6 substantially in an intermediate position, previously named second intermediate position', in which it is generally provided, in the main embodiment, that the anti-rebound part is at the latest in its second position, and thus the anti-rebound device in its second configuration, to avoid contact with the first stop.

[0034] According to a second main feature of the first embodiment, the transition of the anti-rebound part from said second position or second range of positions to said first position or first range of positions is triggered by the striking of the gong by the hammer body, more precisely by the striking beak 9 (instant shown in the Figure 2c The anti-rebound section is arranged so that, in the second position or second range of positions, its center of mass CM is at a distance from a geometric line passing through the second axis of rotation 22 and orthogonal to a line connecting the first axis of rotation 14 and the second axis of rotation. The anti-rebound section 20 experiences, relative to the body 8, an apparent torque, previously called the second apparent torque, generated by an apparent force FA at the center of mass CM due to a reaction force FR, produced by the gong 10, which is experienced by the body 8 and therefore the anti-rebound section at the level of the second axis of rotation 22, when the striking face 9 comes to rest against the gong. The anti-rebound device is arranged so that the second apparent torque generates a rotation of the anti-rebound section ( Figure 2c ) up to the first position ( Figure 2d ) or first range of positions (in another variant), in which it remains during the body's return movement ( Figures 2d has 2f ) occurring directly after the impact. A corollary of the second main characteristic is as follows: The anti-rebound part 20 remains in the first position during the return movement occurring during the single rebound following an impact, which is partial. It will be noted that the apparent torque experienced by the anti-rebound part is relatively strong. Thus, the passage from said second position to said first position by the anti-rebound part 20 is almost instantaneous with the impact ( Fig. 2d ), the anti-rebound part can come to rest at high angular speed against the stop 30, which allows sufficient energy to be dissipated from the anti-rebound part 20 to prevent it from returning to its second position.

[0035] As already indicated, during the return movement of the body 8 during the single partial rebound occurring after a strike, the stop 33, carried by the flexible blade 32, retracts momentarily under the action of the anti-rebound part 20 which presses laterally against this stop ( Figure 2e ). The return movement continues until the protruding part 21 of the anti-rebound part has passed the stop 33, in a second direction of rotation opposite to the first direction of rotation, to reach a maximum position ( Figure 2f ) which is located at least at a first intermediate position of the body 8 ( Figure 2g ) from which a rotational movement of the body 8 in said first direction of rotation to return towards the gong 10, while the anti-rebound part is still in its first position and the anti-rebound device is therefore in its first configuration, is stopped by the stop 33 before the striking beak 9 can touch the gong, whether vibrating or not. The striking device, and more particularly the anti-rebound device 5, is arranged so that, during said return movement, the body 8 of the hammer reaches at least said first intermediate position, from which the hammer is stopped during a rotation in said first direction when the anti-rebound part 20 is in the first position, without however reaching the extreme position. To this end, in particular, the residual energy retained by the hammer after a strike is adjusted.Preferably, to obtain a certain degree of operational security, the anti-rebound device is arranged so that the return movement reaches a maximum position (. Fig. 2f ) located above said first intermediate position. It will be noted that, in the first principal embodiment, the second intermediate position of body 8 is different from the first intermediate position of this body (approximately represented in the Fig. 2g ), the second intermediate position corresponding to a second angular position of the body which is further from said contact position of the body ( Fig. 2c ) that the first intermediate position, which corresponds to a first angular position of the body.

[0036] After a brief period of stabilization, the hammer is at rest again ( Figure 2h ), unless the hammer actuation mechanism has begun loading the hammer for the next strike before the hammer has come to a complete rest. It should be noted that the first stop is supported by a flexible element and, in the variant shown, exhibits a certain degree of flexibility, particularly in the angular direction relative to the first axis of rotation 14. Thus, the anti-rebound device 5 is arranged, and in particular the rest position intended for the body 8 is chosen so that, despite the elasticity of the stop 33 and its support 32, the striking face 9 cannot touch the gong 10 in a state of vibration, and therefore a fortiori in a non-excited / non-vibrating state.

[0037] It should be noted that, in other embodiments, only the first main feature or only the second main feature described above is provided.

[0038] We will describe below, with reference to Figures 3 has 5 , a second embodiment of a watch movement according to the invention. We will essentially only describe the differences with the first embodiment, without describing again in detail the elements common to the two embodiments, which are both encompassed in the main embodiment described above.

[0039] The movement 42 includes a striking device 44 which differs from the striking device 4, already described, in the arrangement of the anti-rebound device 45 and its operation. The general operation remains the same, in particular in that the anti-rebound device prevents the hammer from making a complete rebound after a strike and from striking the gong again before a subsequent strike executed in a controlled manner by the striking device.

[0040] The anti-rebound device 45, forming the striking device 44, comprises an anti-rebound portion 20a, mounted on the body 8 of the hammer 7, which is similar to the anti-rebound portion 20 of the first embodiment, the only difference being the positioning of the pin 28, which forms a support for a flexible blade 48 fixed to the body 8 of this anti-rebound portion and forming said flexible element of the main embodiment. Thus, the anti-rebound portion 20a has a center of mass CM that is distant from the second axis of rotation 22, and it has a projecting portion 21 defining a contact surface 21a with a first stop 46. This first stop 46 is rigidly mounted on the plate 3. The stop 46 is fixed relative to the plate, which forms a support for the striking device, in particular for the hammer.Thus, in the second embodiment, the transition of the anti-rebound portion 20a from the second position to the first position, as defined previously, cannot be triggered by the strike and cannot occur during or immediately after that strike. It should be noted that the transition in question concerns, as defined previously, a transition between the second and first configurations of the anti-rebound device 45, following which the anti-rebound device remains in the first configuration until the hammer is stopped by the first stop 46, during the single partial rebound following each strike, in a movement of said body towards the gong, defining a first direction of rotation for this hammer body.Thus, during the passage in question, the anti-rebound device is returned to the first configuration and remains in this first configuration until the hammer is again at rest or again cocked by the actuation mechanism.

[0041] According to a first particular feature of the second embodiment, the anti-rebound device 45 does not define a stable position for said second position of the anti-rebound portion. Indeed, as will be explained below with reference to Figures 4a has 4g, the anti-rebound part dynamically moves from said first position to said second range of positions, which substantially has a limit position defined by the stiffness of the flexible blade or possibly by a limiting stop (for example, the part for attaching the flexible blade 48 to the plate 3), and then returns to the first range of positions at the latest upon impact. According to a second particular feature of the second embodiment, due to the first stop 46 fixedly arranged on the plate 3, the aforementioned movement of the anti-rebound part 20a from said second position or second range of positions to said first position or first range of positions takes place during said return movement after the body 8 has passed said first intermediate position ( Figure 4f ).

[0042] There Figure 3 represents the inactive striking device 44 with the hammer 7 at rest, the hammer body 8 thus being in the rest position corresponding to the first position. The body 8 is held in the rest position by the first stop 46 retaining the projecting part 21, whose contact surface 21a bears against an upper surface 46a of this first stop, while the body 8 remains subjected to a force from the drive spring 12 which holds the anti-rebound part 20a against the second stop 30, which defines said first position of this anti-rebound part. In addition, the flexible blade 48 presses slightly against the pin 28, which helps to position the anti-rebound part in said first position. The Figure 4a shows the hammer 7 in an armed state, with its body in the extreme position PE. It is noted that, unlike the first embodiment, the anti-rebound part 20a is then still in its first position, in which it is held by the flexible blade 48 exerting a small restoring force on the pin 28.

[0043] According to a main feature of the second embodiment, the anti-rebound device 45 is arranged so that the passage of the anti-rebound part 20a from the first position or first range of positions to the second position or second range of positions takes place following the release of the hammer and before the body 8 reaches the second intermediate position ( Fig. 4b ), that is to say between the Figure 4a and the Figure 4b This transition results from the fact that the body 8 of the hammer 7 is subjected to a strong acceleration generated by the driving force FE applied by the spring 12 on the pin 16 fixed to the body 8 of the hammer in order to strike the gong. This strong acceleration is transmitted to a material axis fixed to said body, which defines the second axis of rotation 22. In other words, the anti-rebound part 20a is mounted to rotate freely around this material axis, which, along with the body 8, experiences a strong acceleration as soon as the hammer is released by the actuation mechanism. This acceleration generates an apparent force FA1 on the anti-rebound part 20a at its center of mass CM, which is located at a distance from the second axis of rotation.Indeed, the anti-rebound part 20a is arranged so that, in the first position or first range of positions, the center mass CM is distant from a geometric line passing through the second axis of rotation and orthogonal to a line connecting the first axis of rotation 14 and the second axis of rotation 22, the anti-rebound part undergoing relative to the body 8 an apparent torque of force due to the said strong acceleration which this body undergoes, and therefore the anti-rebound part at the level of the second axis of rotation.

[0044] Remarkably, the anti-rebound device 45 is arranged, in particular the elasticity of the flexible blade 48, the anti-rebound part and the position of the pin 28 are arranged so that said apparent torque of force causes a rotation of the anti-rebound part 20a to the second position or, in the variant shown, to the second range of positions and then this anti-rebound part remains in the second position or in this second range of positions at least until the end of the contact surface 21a of the anti-rebound part has passed a contact surface 46a of the first stop 46 during said rotation of the body 8 between the extreme position PE and the contact position PF to effect a strike.The apparent force torque, resulting from the apparent force FA1, acts against the restoring force torque, generated by the restoring force of the flexible blade 48 on the pin 28, which tends to return the anti-rebound part towards the stop 30 defining the first position of the anti-rebound part 20a. The restoring force torque thus increases with the rotation of the anti-rebound part from its first position and therefore progressively opposes the apparent force torque.

[0045] At the latest when the striking nozzle 9 reaches the stamp 10 ( Figure 4c ), the anti-rebound part returns to the first range of positions and it strikes the second stop 30 forcefully upon impact ( Figure 4d This generates a strong apparent torque on the anti-rebound section, caused by an apparent force FA2 resulting from the reaction force FR of the snare on the hammer body 8 and therefore on the material axis around which the anti-rebound section 20a is mounted, as already explained. Advantageously, the hammer 7 is neither stopped nor slowed between the extreme position, in which the hammer is cocked, and the contact position where the striking face 9 reaches the snare 10. This is a remarkable result of the invention.

[0046] In general, the first apparent torque on the anti-rebound part opposes a torque resulting from the said restoring force of the flexible element (flexible blade 48), the flexible element being arranged so that the restoring force can return the anti-rebound part to said first position or first range of positions only after the end of the contact surface 21a of the anti-rebound part 20a has passed the stopping surface 46a of the first stop 46 during the rotation of the body 8 between the extreme position and the contact position and before the hammer body reaches, during said return movement, a maximum position for this return movement.

[0047] In the particular variant shown in the figures, given that the first stop 46 is fixed and that, moreover, the first position of the anti-rebound part is weakly stable in the absence of external force exerted on the hammer (because the holding of the anti-rebound part against the pin 30 is achieved only by the flexible blade 48 which exerts a weak force on the anti-rebound part in its first position), said transition from the second configuration of the anti-rebound device to the first configuration, in which it then remains until the protruding part 21 of the anti-rebound part 20a comes into contact with the first stop 46, takes place only during the return movement, following the strike, as soon as the body 8 has reached said first intermediate position ( Figure 4f ) or shortly thereafter. During the return movement, as it passes the stop 46, it is possible that the protruding part 21 of the anti-rebound part may come into contact with this stop ( Figure 4e ) and that it then undergoes a rotational movement, braked by the restoring force of the flexible blade 48, to reach again, for a short time, the second range of positions, so as to be able to reach at least the said first intermediate position. The stop 46 is configured to facilitate the aforementioned rotational movement of the anti-rebound part without stopping the return movement of the body 8, in particular without preventing it from reaching at least the first intermediate position.

[0048] It will be noted that in the second embodiment, having a fixed stop 46 results in the first intermediate position and the second intermediate position both corresponding substantially to the same angular position of the body 8 of the hammer.

[0049] To the Figure 5 Considering the specific case of the same intermediate position PInt for the first and second intermediate positions (to simplify the diagram), we summarize the process of sound generation by the bell-ringing device according to the invention, namely the process of the hammer striking the bell from its rest state until it returns to that rest state. The hammer is cocked by the actuation mechanism from its rest position PR to the extreme position PE of the body, thus undergoing a rotation in the second direction. Then, the hammer is released, and its body undergoes a rotation in the first direction, accelerating under the action of the driving force FE exerted by the drive spring, towards the bell until the striking beak makes contact with the bell at a striking / contact position PF of the body.A second phase P2 is distinguished in this rotation in the first direction, located between the extreme position PE and the intermediate position P Int.

[0050] According to the invention, the anti-rebound device transitions from said first configuration to said second configuration during phases P1 and P2, more particularly either during a first phase P1 between the maximum position PM of said body's return movement after a strike and the extreme position PE, or during said second phase P2. During rotation in the first direction from the extreme position PE of said body, the hammer is not stopped and its rotational movement in the second direction is not slowed at least during a third phase P3 directly following the second phase P2 and ending when said body reaches the striking / contact position PF. Preferably, the hammer is not slowed in the rotational movement of its body in the first direction between the extreme position and the striking / contact position.

[0051] Following the strike, the hammer body 8 undergoes a return movement, namely a rotation in said second direction of rotation, to the maximum position PM, this return movement defining a fourth phase P4 of the hammer striking process. In a preferred main embodiment, the de-bouncing device moves from said second configuration to said first configuration during the fourth phase P4, and then remains in this first configuration during a subsequent fifth phase P5 during which the body undergoes a terminal rotation in the first direction (towards the snare) from the maximum position PM to the rest position PR. At the end of a possible short terminal stabilization phase (damping of the rotational movement of the de-bouncing part), the hammer is again at rest ( Figures 2h And 4g). In a particular variant, it can be envisaged that said transition of the anti-rebound device from said second configuration to said first configuration takes place already during the third phase P3, after an end of the contact surface 21a of the anti-rebound part has passed a stop surface of the stop.

Claims

1. A movement (2, 42) incorporating a striking device (4, 44) comprising a bell (10), a hammer (6, 6a, 6b, 6c, 7) rotatable about a first axis of rotation (14), and a spring (12) for driving the hammer in rotation. The hammer has a body (8) with a striking beak (9) arranged in a zone distant from the first axis of rotation. The driving spring is arranged to apply a driving force to the body of the hammer so as to cause its rotation in a first direction that brings the striking beak closer to the bell and allows the bell to be struck by this striking beak. The striking device (4, 44) includes a hammer-actuating mechanism capable of cocking the hammer from a rest position of the hammer body, in which the striking beak is separated from the bell, by rotating this body in a second direction, opposite to the first direction, until a extreme position of said bodyso as to constrain the drive spring, and then release the hammer so that it can strike the bell under the action of the drive force; characterized in thatthe ringing device includes an anti-rebound device (5, 5a, 5b, 5c, 45) which is arranged so as to be able to be alternatively: - in a first configuration, in which the anti-rebound device stops a movement of the hammer body in the first direction of rotation, starting at least at a first intermediate position between the rest position and the extreme position of this body, before the striking beak can touch the gong, whether the latter is vibrating or non-vibrating;and - in a second configuration, different from the first configuration, in which the anti-rebound device does not stop a rotation of the hammer, in the first direction of rotation, between the extreme position of said body and a contact position, at which the striking face reaches the gong, insofar as the anti-rebound device is in this second configuration when the body passes through a second intermediate position between the rest position and the extreme position; the anti-rebound device not slowing the hammer body at least between the second intermediate position and the contact position, preferably between the extreme position and the contact position; in that The striking mechanism is arranged so that the hammer body, after each strike, undergoes a return movement, rising at least to the first intermediate position without reaching the extreme position; and in thatThe striking device is arranged so that the anti-rebound device is: - maintained in the first configuration when the hammer is at rest and said body is therefore in the rest position; - put into the second configuration, each time the hammer is cocked by the actuation mechanism or following the release of the hammer before the body (8) of this hammer reaches the second intermediate position; - then returned to the first configuration during said return movement of said body; and - then remains in the first configuration until the hammer is again at rest or again cocked by the actuation mechanism; said body thus undergoing a single rebound, which is partial, following each strike.

2. Movement according to claim 1, characterized in thatthe anti-rebound device includes an anti-rebound part (20, 20a), mounted movably in rotation on the body (8) of the hammer (6, 6a, 6b, 6c, 7) about a second axis of rotation (22), and a first stop (33, 46) mounted on a support (3) of the hammer and arranged so that - when the anti-rebound part is, during a passage of said body through the second intermediate position, in a second position or second range of positions relative to the body of the hammer and the anti-rebound device is thus in the second configuration, the anti-rebound part (20, 20a) does not come into contact with the first stop (33, 46) during the rotation of said body (8) between the extreme position and the contact position;- when the anti-rebound part is in a first position or first range of positions relative to the body of the hammer and the anti-rebound device (5, 5a, 5b, 5c, 45) is thus in the first configuration, the body of the hammer is stopped by the anti-rebound part coming to rest against the first stop (33, 46) during a rotation in said first direction starting at least at the first intermediate position and below the extreme position; and - when the hammer is at rest, the anti-rebound part is in contact with the first stop.

3. Movement according to claim 2, characterized in thatThe anti-rebound device (5, 5a, 5b) comprises a flexible element (24, 24a, 24b) which is fixed to said body (8) and which has a portion having a hollow (26, 27, 27a) having a non-tangential orientation relative to the second axis of rotation (22), preferably angularly closer to a radial line passing through a point at the bottom of the hollow than to a tangential line passing through this point, this hollow defining a stable position for the anti-rebound part (20) which includes a bearing portion (28), against which the flexible element can press, and arranged so as to be able to be housed at least partially in the hollow, substantially without play when this anti-rebound part is in said stable position, and to be able to elastically displace said portion of the flexible element, under the action of a torque that the anti-rebound part may experience, to exit the hollow,the anti-rebound portion being in said first position or said second position when it is in said stable position defined by the hollow of the flexible element, said portion of the flexible element being configured such that, when the hollow defines the first position, the anti-rebound portion (20) can be brought into the second position or second range of positions under the action of said torque force and, when the hollow defines the second position, the anti-rebound portion can be brought into the first position or first range of positions under the action of said torque force.

4. Movement according to claim 3, characterized in thatsaid hollow (27a) is configured so that it has a flank (27b) forming a stop for the bearing part (28) according to a direction of rotation of the anti-rebound part (20) which is opposite to the direction of rotation allowing the anti-rebound part to be brought into the second position or second range of positions, respectively into the first position or first range of positions.

5. Movement according to claim 3 or 4, wherein said portion of the flexible element is a first portion and said hollow (26) is a first hollow; characterized in thatThe flexible element (24a, 24b) comprises a second portion defining a second hollow (27, 27a) having a non-tangential orientation relative to the second axis of rotation, preferably angularly closer to a radial line passing through a point at the bottom of the second hollow than to a tangential line passing through that point, this second hollow defining a second stable position for the anti-rebound part, the flexible element being arranged so that the support part can be housed at least partially in the second hollow, substantially without play when this anti-rebound part is in the second stable position, and can elastically displace the second portion of the flexible element under the action of a second torque, opposite to said torque, that the anti-rebound part can undergo to exit the second hollow,the first hollow defining said first position of the anti-rebound part and the second hollow defining said second position of this anti-rebound part when the support part is housed alternately in the first hollow and in the second hollow, the second portion of the flexible element being configured so that the anti-rebound part can be brought into the first position under the action of said second torque.

6. Movement according to claim 2, characterized in thatthe anti-rebound device includes a flexible element (24, 48) which is fixed on said body and which has a segment (25, 25a) capable of exerting a restoring force, generated by the constrained flexible element, on a support part (28), which comprises the anti-rebound part (20, 20a), in a tangential direction relative to the second axis of rotation (22) and thus cause the anti-rebound part to rotate in the direction of the tangential direction, said body having a second stop (30, 31) which is arranged so as to be able to stop a rotation of the anti-rebound part, in said direction of the tangential direction, in said first position or in said second position of the anti-rebound part.

7. Movement according to claim 6, characterized in thatthe flexible element (24, 48) is arranged so that said segment (25, 25a) exerts the restoring force on the support part (28) to return the anti-rebound part to the first position or the second position, defined by the second stop, and also when the anti-rebound part is in this first position, respectively in this second position.

8. Movement according to claim 6 or 7, wherein said segment (25) is a first segment and said restoring force is a first restoring force; characterized in thatthe flexible element (24c) has a second segment (25a) capable of exerting a second restoring force on the support part (28) in a second tangential direction, opposite to said tangential direction, and thus causing the anti-rebound part (20) to rotate in the direction of the second tangential direction, said body having a third stop (31) which is arranged so as to be able to stop a rotation of the anti-rebound part, in said direction of the second tangential direction, in said second position, respectively in said first position of the anti-rebound part.

9. Movement according to claim 8, characterized in thatThe flexible element (24c) is arranged so that the second segment (25a) exerts the second restoring force on the support part to return the anti-rebound part to the second position or the first position, defined by the third stop (31), and also when the anti-rebound part is in this second position, respectively in this first position.

10. Movement according to claim 3 or 4, characterized in thatsaid flexible element (24) has a segment (25) capable of exerting a restoring force, generated by the constrained flexible element, on the support part (28) in a tangential direction relative to the second axis of rotation (22), said body comprising a second stop (30) which is arranged so as to be able to stop a rotation of the anti-rebound part (20), in the direction of said tangential direction, in said second position of the anti-rebound part, when said hollow (26) defines said first position, or in the first position when the hollow defines the second position.

11. Movement according to claim 10, characterized in that the flexible element (24) is arranged so that the segment (25) continues to exert the restoring force on the support part (28) when the anti-rebound part (20) is in the second position, respectively in the first position.

12. Movement according to claim 10 or 11, characterized in thatsaid hollow (26) defines said second position and the second stop (30) defines first position.

13. Movement according to any one of demands 2 to 12, characterized in that the anti-rebound device (5) is arranged so that a passage of the anti-rebound part (20) from said first position or first range of positions to said second position or second range of positions takes place, when the hammer (6) is being cocked by the actuation mechanism, during the rotation of said body (8) between a maximum position for said return movement and said extreme position.

14. Movement according to any one of demands 2 to 12, characterized in that the anti-rebound part (20, 20a) has a center of mass (C M), which is distant from the second axis of rotation (22), and has a contact surface (21a) with the first stop (33, 46), this contact surface being configured to stop the body (8) of the hammer (6, 6a, 6b, 6c, 7), when the anti-rebound device (20) is in said first configuration, during said rotation in said first direction, from at least the first intermediate position, by coming to butt against the first stop and to maintain said body in the rest position when the hammer is at rest.

15. Movement according to demands 14, characterized in thatthe anti-rebound device (45) is arranged so that a passage of the anti-rebound part (20a) from said first position or first range of positions to said second position or second range of positions takes place following the release of the hammer (7) and before said body (8) reaches the second intermediate position, the anti-rebound part being arranged so that, in the first position or first range of positions, said center of mass is distant from a geometric line passing through the second axis of rotation (22) and orthogonal to a line connecting the first axis of rotation (14) and the second axis of rotation, the anti-rebound part undergoing relative to said body a first apparent torque due to an acceleration undergone by the body, and therefore the anti-rebound part at the level of the second axis of rotation, generated by said driving force applied to this body by the drive spring (12),the anti-rebound device being arranged so that the first apparent torque causes a rotation of the anti-rebound part to the second position or second range of positions and remains in this second position or second range of positions until an end of said contact surface (21a) of the anti-rebound part has passed a stopping surface (46a) of the first stop (46) during said rotation of said body (8) between said extreme position and said contact position.

16. Movement according to demands 15 and 6 or 7, characterized in that the second stop (30) defines the first position of the anti-rebound part (20a); and in thatthe first apparent torque of force which the anti-rebound part undergoes opposes a torque of force resulting from said restoring force, the flexible element (48) being arranged so that the restoring force can return the anti-rebound part to said first position or first range of positions only after an end of the contact surface (21a) of the anti-rebound part has passed, during said rotation of said body between the extreme position and the contact position, a stopping surface (46a) of the first stop (46) and before the body (8) of the hammer (7) reaches, during said return movement, a maximum position for this return movement.

17. Movement according to any one of demands 14 to 16, characterized in thata passage of the anti-rebound part (20) from said second position or second range of positions to said first position or first range of positions, in which it then remains until the end of said single partial rebound, is triggered by the striking of the snare by the body (8) of the hammer, the anti-rebound part being arranged so that, in the second position or second range of positions, said center of mass is distant from a geometric line passing through the second axis of rotation (22) and orthogonal to a line connecting the first axis of rotation (14) and the second axis of rotation, the anti-rebound part undergoing relative to said body a second apparent torque due to a reaction force of the snare that this body undergoes, and therefore the anti-rebound part at the level of the second axis of rotation, when the striking beak (9) comes to rest against the snare (10),the anti-rebound device being arranged so that the second apparent torque causes a rotation of the anti-rebound part to the first position or first range of positions, in which it remains during said return movement of said body.

18. Movement according to claim 17, characterized in that the first stop (33) is carried by a flexible blade (32) and configured so that it can momentarily retract during said return movement of said body (8), in said second direction of rotation, under the action of the anti-rebound part (20) which momentarily presses against the first stop.

19. Movement according to any one of demands 2 to 16, characterized in that the first stop (46) is fixed; and in thata passage of the anti-rebound part (20a) from said second position or second range of positions to said first position or first range of positions, in which it then remains until the end of said single partial rebound, takes place during said return movement as soon as said body (8) has reached or passed the first intermediate position.

Images