Adjustment system for watch movements equipped with a device to stop the oscillator

Abstract

The present invention provides an adjustment system equipped with a mechanical vibrator stop device that stops the vibrator at a predetermined angular position and quickly and accurately resumes operation. [Solution] An adjustment system, wherein the stop device 150 comprises a retaining member 151 fixed to the balance wheel 121, the retaining member 151 is configured to engage with a stop pawl 155 rotatably attached to one end of a stop lever 152, the stop lever 152 is movable between a non-operating position that allows free vibration of the mechanical oscillator 120 and an operating position where the stop pawl 155 is on the track of the retaining member 151, the stop pawl 155 is configured such that when the stop lever 152 is in the operating position, the retaining member 151 moves in the rotational directions S1, S2 of the current half-oscillation of the balance wheel 121 when the stop device 150 is operated and locks the rotation of the balance wheel 121 in the reverse rotational direction S2, S1 of the next half-oscillation, the stop pawl 155 forms a stop for the movement of the retaining member 151.

Description

[Technical Field]

[0001] This invention relates to the field of adjustment systems for watch movements.

[0002] More specifically, the present invention relates to a stopping device used to stop a mechanical oscillator attached to such an adjustment system, particularly during a time setting operation or when the barrel is at the minimum winding level.

[0003] The present invention also relates to a watch movement equipped with an adjustment system and a watch equipped with such a watch movement. [Background technology]

[0004] Conventionally, the adjustment system includes a mechanical oscillator comprising a balance wheel and an elastic member.

[0005] In high-end watches, the adjustment system may also include a device to stop the mechanical oscillator.

[0006] These oscillator stop devices, also known as "balance stop mechanisms," are used to stop the oscillation of the balance wheel when setting the time on a watch using a control stem, thereby fixing the position of the second hand. Such stop devices allow the watch movement to be restarted at a precise moment.

[0007] Conventional mechanical oscillator stop devices commonly used in balance wheels include a stop lever controlled by the position of the watch's control stem or by pressing a button. Traditionally, the end of the lever abuts against the outer surface of the balance wheel rim or the balance stem.

[0008] As described in U.S. Patent No. 2,212,535, another solution proposes using several checker screws distributed on the rim and facing outward as stoppers that engage with pegs provided at the end of the stop lever when the stop lever is operated by stop control.

[0009] A drawback of such a stop device is that the angular stopping position of the mechanical oscillator is random. This means there is a risk that the balance wheel may stop at a specific position where the elastic member has little or no potential energy, preventing the oscillator from restarting. Furthermore, even if the balance wheel stops while the elastic member has non-zero potential energy, this energy varies depending on the angular position of the balance wheel at the time of stopping, and will differ from stop to stop. As a result, the amplitude of the balance wheel upon restart will vary, and the rate will become inaccurate.

[0010] U.S. Patent No. 3,733,805 provides one solution comprising providing at least one sawtooth-like portion around the edge of the balance rim, consisting of a series of concave indentations alternating with convex projections. The sawtooth-like portion extends over an angular range of 30° to 90°. However, even though this solution can prevent the balance from stopping at a position where the elastic member has zero potential energy due to the position of the sawtooth-like portion, the angular stopping position of the balance in this portion is still random. In this case, the amplitude of the balance changes when the balance restarts, resulting in an inaccuracy that is unacceptable for a watch that is supposed to measure time very accurately when it resumes operation.

[0011] European Patent Application Publication No. 2221678 provides another solution consisting of a heart-shaped cam fixed to the balance staff associated with the hairspring, and a lever in the form of a hammer that, when in operation, compresses this heart-shaped component to lock the balance wheel. The shape of the heart-shaped component is determined so that the hairspring moves the balance wheel to a predetermined angular stop position where it has a non-zero potential energy. However, this solution also has drawbacks, as it places additional stress on the balance wheel and hairspring when the balance wheel returns to the angular stop position. Furthermore, using a heart-shaped component in the stopwork may drive the oscillator in the opposite direction to its natural cycle. Therefore, the adjustment system for watch movements, especially the stop mechanism, needs improvement. [Prior art documents]

Patent Documents

[0012]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0013] The present invention aims to improve at least one of the aforementioned drawbacks by providing an adjustment system comprising a stopping device for a mechanical oscillator, which ensures that the mechanical oscillator stops at a predetermined angular position without interacting with the template, and ensures that the mechanical oscillator resumes operation quickly and accurately.

[0014] The present invention also aims to provide a stopping device for a mechanical oscillator that enables the template to stop at an angular position having non-zero potential energy of the spring and allows the mechanical oscillator to restart automatically and immediately.

Means for Solving the Problems

[0015] For this purpose, the present invention is an adjustment system for a timepiece movement, · A mechanical oscillator that oscillates about a vibration axis A1, comprising a template connected to a spring, wherein each oscillation of the mechanical oscillator consists of two consecutive half-vibrations characterized by rotation of the template in two consecutive reverse rotational directions, a mechanical oscillator, · For each of the two oscillations of the mechanical oscillator, a stopping device on the mechanical oscillator configured to lock the template at a predetermined angular position having non-zero potential energy of the spring Relates to an adjustment system for a timepiece movement comprising

[0016] According to the invention, the stop device comprises a holding member fixed to the template, the holding member being configured to engage with a stop pawl rotatably mounted at one end of a stop lever, the stop lever being movable between a non-operating position allowing free oscillation of the mechanical oscillator and an operating position in which the stop pawl is on the path of the holding member. Further, the stop pawl is configured such that when the stop lever is in the operating position, the stop pawl allows the holding member to move in the rotational direction of the current half-oscillation of the template during operation of the stop device and locks the rotation of the template in the reverse rotational direction during the next half-oscillation, the stop pawl forming a stop for the movement of the holding member.

[0017] Preferably, the stop pawl is held in the equilibrium position by a stop spring.

[0018] Preferably, the stop pawl comprises a first nose formed by the junction of a first sliding surface and a first stop surface, the first sliding surface being configured to ensure that the stop pawl rotates in the first rotational direction of the template against the stop spring when in contact with the holding member and to allow movement of the holding member in the first rotational direction of the template, the first stop surface forming a stop for the movement of the holding member and being configured to lock the rotation of the template in a second rotational direction opposite to the first rotational direction of the template.

[0019] Preferably, the stop pawl comprises a second nose formed by the junction of a second sliding surface and a second stop surface, the second sliding surface being configured to ensure that the stop pawl rotates in the second rotational direction of the template against the stop spring when in contact with the holding member and to allow movement of the holding member in the second rotational direction of the template, the second stop surface forming a stop for the movement of the holding member and being configured to lock the rotation of the template in the first rotational direction.

[0020] Preferably, the first nose and the second nose are arranged symmetrically opposite to a plane passing through the rotation axis of the stop pawl and the oscillation axis of the mechanical oscillator.

[0021] Preferably, the stop claw has a C-shape, with the ends of the C-shape having a first beak portion and a second beak portion.

[0022] Preferably, the stop device is configured to lock the balance wheel at an angular position having an angular lug of 120° to 180°, preferably 120° to 180°, relative to the balance wheel's locked position P0 (clockwise or counterclockwise). The angular position P0 of the balance wheel corresponds to the position of the balance wheel where the spring is not under stress, i.e., neither contracted nor extended. In other words, at this angular locked position P0, the potential energy of the balance wheel is zero. When the balance wheel is in the locked position P0, the retaining member is aligned with the escapement line.

[0023] Preferably, the balance wheel has a rim attached to its central portion by an arm, and the retaining member is positioned at one level of the arm or at the level of the rim.

[0024] Preferably, the retaining member is made of the same material as the balance wheel, or is formed by pins, pegs, or studs driven into the balance wheel.

[0025] The present invention also relates to a watch movement equipped with an adjustment system according to the present invention.

[0026] Preferably, the watch movement includes a direct impulse escapement that works in conjunction with the adjustment system according to the present invention.

[0027] Preferably, the direct impulse escapement is a natural escapement. [Brief explanation of the drawing]

[0028] The object, advantages, and features of the present invention will become clear from the following detailed description with reference to the following figures. [Figure 1] A schematic top view of an exemplary embodiment of the adjustment system according to the present invention, which includes a stop device, is shown. In particular, Figure 1 shows the adjustment system when the stop device is in the non-operating position. [Figure 2] A schematic top view of the adjustment system when the stop device is in the operating position is shown. [Figure 3] This shows the different states of the balance wheel and the stop device when the stop device is activated and stops the balance wheel. [Figure 4] This shows the different states of the balance wheel and the stop device when the stop device is activated and stops the balance wheel. [Figure 5] This shows the different states of the balance wheel and the stop device when the stop device is activated and stops the balance wheel. [Figure 6] This shows the different states of the balance wheel and the stop device when the stop device is activated and stops the balance wheel. [Figure 7] Figures 1 to 6 are schematic diagrams of a watch movement incorporating the adjustment system according to the present invention.

[0029] In all figures, common elements have the same sign unless otherwise specified. [Modes for carrying out the invention]

[0030] Figures 1 to 6 are schematic top views showing different states of exemplary embodiments of the adjustment system 100 for a clock movement 200 according to the present invention, which includes a stop device 10.

[0031] In particular, Figure 1 shows the adjustment system 100 in operation when the stop device 150 is in the non-operating position.

[0032] In particular, Figure 2 shows the adjustment system 100 when the stop device 150 is in the operating position.

[0033] The adjustment system 100 includes a mechanical vibrator 120 that vibrates around the vibration axis A1.

[0034] The mechanical oscillator 120 comprises a balance wheel 121 with a generally circular rim 122 attached to a central portion 124 by a balance arm 123. The central portion 124 is fixed to an arbor of a balance staff 125 that extends along the oscillation axis A1.

[0035] Conventionally, the balance wheel 121 is connected to a spring 130, such as a hairspring, which is schematically shown as a dotted circle in Figure 1 for simplification. The hairspring 130 is connected to the balance wheel 121 in the conventional manner.

[0036] Each oscillation of the mechanical oscillator 120 is defined by a sequence of two half-oscillations characterized by a rotation of the balance wheel 121 in a first rotational direction S1 followed by a rotation in a second counter-rotational direction S2.

[0037] In the first half-oscillation of the oscillation, the hairspring 130 on the mechanical oscillator 120 contracts, for example, until it reaches maximum contraction at a first angular position at the end of the oscillation of the balance wheel 121; in the next half-oscillation, the hairspring 130 on the mechanical oscillator 120 relaxes and expands until it reaches maximum relaxation at a second angular position at the end of the oscillation of the balance wheel 121, and so on. Clearly, the angular position at the end of the oscillation of the balance wheel 121 depends on the amount of energy available in the barrel.

[0038] In each half-oscillation of the mechanical oscillator 120, the balance wheel 121 passes through an angular position where the potential energy of the hairspring 130 is zero. At this particular angular position of the balance wheel 121, the hairspring 130 is completely relaxed and shows neither extension nor contraction. This particular angular position is referred to herein as the locked position P0.

[0039] The adjustment system 100 according to the present invention adjusts the position of the mechanical oscillator 120, more specifically the balance wheel 121, to a predetermined angular position P, according to the user's request. bloc , P bloc’ It is equipped with a stop device 150 that allows it to be locked.

[0040] The stop device 150 advantageously locks the balance wheel 121 at a predetermined angular position where the hairspring 130 has a non-zero potential energy, a position that ensures the restart of the balance wheel 121.

[0041] For example, the stopping device 150 according to the present invention has a first predetermined angular position P that has enough energy to contract the hairspring 130 and ensure the autonomous starting of the adjustment system 100. bloc This allows the Temp 121 to be locked.

[0042] According to another embodiment, the stopping device 150 according to the present invention has a second predetermined angular position P that has enough energy to unfold the hairspring 130 and ensure the autonomous starting of the adjustment system 100. bloc’ This allows the Temp 121 to be locked.

[0043] Preferably, the stop device 150 according to the present invention has a first predetermined angular position P that has sufficient energy to ensure that the hairspring 130 contracts and the adjustment system 100 automatically starts in response to the half-vibration of the mechanical oscillator 120 when the stop device 150 is operated. bloc Then, a second predetermined angular position P has enough energy to ensure that the hairspring 130 unfolds and the adjustment system 100 starts automatically. bloc’ Both are configured to lock the Temp 121.

[0044] Therefore, the stop device 150 according to the present invention is advantageous in that it is possible to lock the balance wheel 121 at a predetermined angular position regardless of the half-vibration of the vibration when the stop device 150 is in operation.

[0045] Preferably, the stop device 150 has an angular lag between 120° and 180° relative to the angular lock position P0 of the temp 121 at a predetermined angular position P bloc , P bloc’ It is configured to lock the Temp 121.

[0046] Preferably, the stop device 150 is configured to lock the template 121 at a predetermined angular position P having an angular lag between 130° and 180° with respect to the angular lock position P0 of the template 121. bloc , P bloc’ where the template 121 is locked.

[0047] Preferably, the stop device 150 is configured to lock the template 121 at a predetermined angular position P having an angular lag between 140° and 180° with respect to the angular lock position P0 of the template 121. bloc , P bloc’ where the template 121 is locked.

[0048] Preferably, the stop device 150 is configured to lock the template 121 at a predetermined angular position P having an angular lag between 150° and 180° with respect to the angular lock position P0 of the template 121. bloc , P bloc’ where the template 121 is locked.

[0049] According to the present invention, when the timepiece movement 200 is restarted, the template 121 can restart with a known amplitude that is constant over time, thereby ensuring high precision of the pace of the timepiece movement 200. Such a stop device 150 is particularly suitable for use with any type of oscillator and the second hand.

[0050] The stop device 150 includes a holding member 151 fixed to the template 121.

[0051] The holding member 151 extends in a direction parallel to the oscillation axis A1 of the mechanical oscillator 120 and protrudes with respect to the upper or lower surface of the template 121.

[0052] Preferably, the holding member 151 is disposed on the surface of the template opposite to the whisker 130 of the template.

[0053] The holding member 151 is, for example, a pin, a peg, a stud, a stop, etc. attached to the upper or lower surface of the template 121. The holding member 151 can also be made of the same material as the template 121.

[0054] Preferably, the retaining member 151 is positioned at the level of the rim 122 or at one level of the balance arm 123. The retaining member 151 has a predetermined position with respect to the escapement line, which corresponds to a straight line extending from the axis of rotation of the balance staff 125 arbor to the axis of rotation of the escape wheel axle (not shown). Advantageously, the retaining member 151 is positioned on the balance so as to align with the escapement line when the balance wheel 121 is in its locked angular position.

[0055] The stop device 150 also includes a stop lever 152 or stop rocker, which is controlled directly or indirectly by a stop control that is actuated at the request of the user or by the gear train of the watch movement. The stop control may be actuated, for example, by a control shaft, winding stem or button.

[0056] The stop lever 152 is rotatable around the axis A2 between a non-operating position (shown in Figure 1) where the mechanical oscillator 120 vibrates freely and an operating position (shown in Figure 2). The various positions of the stop lever 152 are indexed, for example, by a peg 157 or stud, which is fixed, for example, to a plate or bar on the clock movement 200 and functions as a stop between the peg or stud and the end of an opening 156 provided in the body of the stop lever 152. Naturally, the reverse arrangement, in which a peg fixed to the stop lever 152 engages with an opening formed in a plate or bar on the clock movement, is also possible without departing from the scope of the present invention.

[0057] The stop lever 152 is connected at the end opposite to the rotation axis A2 to a stop pawl 155 configured to engage with a retaining member 151 on the balance wheel 121 when the stop device 150 is activated. When the stop lever 152 is in the activated position, the stop pawl 155 is located on the circular trajectory of the retaining member 151.

[0058] The stop claw 155 is rotatably mounted on the end of the stop lever 152 around the rotation axis A3 and engages with a claw spring 154 that attempts to return the stop claw 155 to an equilibrium position when the stop claw is not being acted upon.

[0059] The claw spring 154 contacts the back of the peg 153 and the stop claw 155, which are attached to the stop lever 152.

[0060] In the first non-operating position of the stop lever 152, that is, when the stop device 150 is not operating, the stop pawl 155 is not positioned on the track of the retaining member 151 so that the balance wheel 121 can oscillate freely under the shock of the hairspring 130. This first free oscillation position of the mechanical oscillator 120 is shown in Figure 1.

[0061] When the stop control is activated, it directly or indirectly drives the stop lever, causing the stop lever 152 to pivot around the rotation axis A2 in its operating position as shown in Figure 2, bringing the stop claw 155 closer to the arbor of the tension rod 125, and positioning the stop claw 155 on the track of the retaining member 151. With the stop lever 152 in this operating position, the peg 157 functions as a stopper against the upper end of the opening 156.

[0062] The stop claw 155 includes at least one beak portion 158a, 158b configured to engage with a retaining member 151 fixed to the balance wheel 121, and to lock the rotation of the balance wheel 151 at a predetermined angular position by engaging with the retaining member 151.

[0063] Preferably, the stop claw 155 has a C-shape and comprises two opposing beaks 158a, 158b arranged symmetrically with respect to a plane passing through the rotation axis A3 of the stop claw 155 and the vibration axis A1 of the mechanical vibrator 120. Preferably, the two beaks 158a, 158b are positioned at the ends of the C-shape. The two beaks 158a, 158b are advantageously positioned at two predetermined angular positions P, one position for each semi-vibration component of the mechanical vibrator 120. bloc , P bloc’ This allows the Temp 121 to be locked.

[0064] More specifically, each beak portion 158a, 158b has a contour configured to allow the retaining member 151 to move in a specific rotational direction of the balance wheel 121 and to lock the retaining member 151 in the opposite direction of the rotation of the balance wheel 121.

[0065] Each beak portion 158a, 158b is formed by the joint between a sliding surface 159 and a stopping surface 160, and the two surfaces 159, 160 are joined at their ends.

[0066] The sliding surface 159 is configured to engage with the retaining member 151 without locking when the balance wheel 121 rotates in a predetermined rotational direction. The sliding surface 159 is oriented so that the stop pawl 155 can rotate about its axis of rotation A3 under the action of the retaining member 151 and move against the stress of the pawl spring 154.

[0067] The stopping surface 160 is oriented substantially perpendicular to the trajectory of the retaining member 151 in a second rotational direction of the balance wheel 121 opposite to the rotational direction described above, and comprises at least one portion that forms a stopping portion for the movement of the retaining member 151 and locks the rotation of the balance wheel 121.

[0068] For example, the first beak portion 158a is configured to allow the retaining member 151 to move in the first rotation direction S1 (clockwise) of the balance wheel 121, and to lock the retaining member 151 in the second rotation direction S1 (counterclockwise) of the balance wheel.

[0069] For example, the second beak portion 158b is configured to allow the retaining member 151 to move in the second rotation direction S2 (counterclockwise) of the balance wheel 121, and to lock the retaining member 151 in the first rotation direction S1 (clockwise) of the balance wheel.

[0070] Therefore, the stop claw 155 functions similarly to a double claw.

[0071] When the stop control is activated, two scenarios can occur depending on the semi-vibration mode of the vibration of the mechanical oscillator 120.

[0072] As shown in Figure 2, if the balance wheel 121 is rotating in a clockwise direction S1 when the stop control is activated, the balance wheel 121 continues its rotation in a clockwise direction S1 around its oscillation axis A1 until it reaches a first angular position at the end of the oscillation (shown in Figure 5), and then begins to rotate again in a counterclockwise direction S2 for the next oscillation. While this half-oscillation is occurring, with the stop pawl 155 on the track of the retaining member 151, the retaining member 151 contacts the sliding surface 159 at the distal end of the first beak portion 158a. This position of the balance wheel 121 is shown in particular in Figure 3.

[0073] Due to the inertia of the temp 121, the retaining member 151 engages with the first sliding surface 159 of the beak portion 158a, and the inclination of the first sliding surface 159 causes the stop claw 155 to rotate around its axis of rotation A3, overcoming the stress applied by the claw spring 154 that compresses the back surfaces of the beak portions 158a and 158b, as shown in Figure 4. Figure 4 in particular shows the retaining member 151 in contact with the end of the first beak portion 158a before moving to the equilibrium position.

[0074] By rotating the stop pawl 155, the balance wheel 121 continues to rotate and can reach a first angular position at the end of the oscillation, as shown in Figure 5.

[0075] At this first angular position at the end of the oscillation of the balance wheel 121, the hairspring 130 attempts to relax, rotating the balance wheel 121 in the reverse direction corresponding to the counterclockwise direction S2, as shown in Figure 6. In this case, at the start of this reverse rotation phase in the counterclockwise direction S2, the retaining member 151 is locked by the stop pawl 155. More specifically, the retaining member 151 contacts the first stop surface 160 of the first beak portion 158a. The first stop surface 160 forms a lock stop, and the hairspring 130 has a known potential energy sufficient to ensure the resumption of oscillation at a first predetermined angular position P bloc This locks the retaining member 151 and, consequently, the balance wheel 121.

[0076] If the balance wheel 121 is rotating in a counterclockwise direction S2 when the stop control is activated, the balance wheel 121 continues its rotation in a counterclockwise direction S2 around its oscillation axis A1 until it reaches a second angular position at the end of the oscillation, before beginning to rotate again in a clockwise direction S1 for the next oscillation. The first angular position at the end of the oscillation when the balance wheel 121 is oscillating in a clockwise direction S1 and the second angular position at the end of the oscillation when the balance wheel 121 is oscillating in a counterclockwise direction S2 may be the same as or relatively similar to each other.

[0077] When this half-vibration occurs, the retaining claw 155 is on the trajectory of the retaining member 151, and the retaining member 151 is in contact with the second sliding surface 159 located at the distal end of the second beak portion 158b.

[0078] Due to the inertia of the temp 121, the retaining member 151 engages with the second sliding surface 159 of the second beak portion 158b, and the inclination of the second sliding surface 159 causes the stop claw 155 to rotate in the opposite direction to the rotational direction around its axis of rotation, overcoming the stress applied by the claw spring 154 that compresses the back surfaces of the beak portions 158a and 158b.

[0079] By rotating the stop pawl 155, the balance wheel 121 can continue to rotate and reach a second angular position when the oscillation of the balance wheel 121 ends.

[0080] At this second angular position at the end of the oscillation of the balance wheel 121, the hairspring 130 attempts to contract, causing the balance wheel 121 to rotate in the counter-clockwise direction corresponding to the clockwise direction S1.

[0081] In this case, at the start of this counter-rotation phase in the clockwise direction S1, the retaining member 151 is locked by the stop pawl 155. More specifically, the retaining member 151 contacts the second stop surface 160 of the second beak portion 158b. The second stop surface 160 forms a lock stop, and the hairspring 130 has a second predetermined angular position P with a known potential energy sufficient to ensure the resumption of oscillation. bloc’The retaining member 151 and the temper 121 are then locked in place.

[0082] The present invention relates to the balance spring 130 having a known sufficient potential energy at at least one predetermined angular position P, regardless of the half-vibration of the vibration of the mechanical oscillator 120. bloc , P bloc’ This makes it possible to stop the Temp 121.

[0083] Naturally, the stop claw 155 is positioned at one of the angular positions P mentioned above. bloc , P bloc’ Therefore, to stop the Temp 121, it can be provided with only one beak portion 158a, 158b.

[0084] To unlock the mechanical oscillator 120 when it is under the action of the stop control or returned to the reference position, the stop lever 152 is returned to its non-operating position, releasing the retaining member 151, thereby releasing the balance wheel 121, which in turn allows the balance wheel 121 to vibrate freely.

[0085] Such an adjustment system 100 is particularly suitable for use in direct impulse escapements, such as natural escapements, or escapements that do not automatically restart the balance wheel after stopping. However, the adjustment system 100 can be used in any type of escapement.

[0086] The adjustment system, more specifically the stop device, according to the present invention, enables the balance wheel to be stopped at a predetermined angular position that has sufficient energy to ensure the autonomous resumption of oscillation after stopping. The adjustment system according to the present invention also enables the avoidance of unintended movements that may occur when the balance wheel is stopped by a prior art stop device. This prevents interruption of the normal operation of the escapement and the components constituting the adjustment system.

[0087] The present invention also relates to a watch movement 200 equipped with an adjustment system 100 according to the present invention.

[0088] Preferably, the watch movement 200 includes the adjustment system 100 according to the present invention together with a direct impulse escapement such as a natural escapement.

Claims

1. An adjustment system (100) for a watch movement (200), - A mechanical oscillator (120) that vibrates around an oscillation axis (A1), comprising a balance wheel (121) connected to a spring (130), wherein each vibration of the mechanical oscillator (120) consists of two consecutive half-vibrations characterized by the rotation of the balance wheel (121) in two consecutive opposite rotation directions (S1, S2), - For each of the two half-vibrations of the mechanical vibrator (120), the spring (130) has a predetermined angular position (P) where it has a non-zero potential energy. bloc , P bloc’ A stop device (150) on the mechanical oscillator (120) is configured to lock the balance wheel (121) and Equipped with, The stop device (150) comprises a retaining member (151) fixed to the balance wheel (121), the retaining member (151) is configured to engage with a stop claw (155) rotatably attached to one end of a stop lever (152), the stop lever (152) is movable between a non-operating position that allows the mechanical vibrator (120) to vibrate freely and an operating position where the stop claw (155) is on the trajectory of the retaining member (151), An adjustment system (100) for a watch movement (200), characterized in that, when the stop lever (152) is in the operating position, the stop pawl (155) is configured to allow the retaining member (151) to move in the direction of rotation (S1, S2) of the current half-oscillation of the balance wheel (121) when the stop device (150) is operated, and to lock the rotation of the balance wheel (121) in the reverse direction (S2, S1) of the next half-oscillation, and the stop pawl (155) forms a stop for the movement of the retaining member (151).

2. The adjustment system (100) for a clock movement (200) according to claim 1, characterized in that the stop pawl (155) is held in a balanced position by a stop spring (154).

3. The adjustment system (100) for a watch movement (200) according to claim 2, characterized in that the stop pawl (155) comprises a first beak portion (158a) formed by the joint between a first sliding surface (159) and a first stop surface (160), the first sliding surface (159) is configured to ensure that the stop pawl (155) rotates against the stop spring (154) when in contact with the retaining member (151), and to allow the retaining member (151) to move in a first rotational direction (S1) of the balance wheel (121), and the first stop surface (160) is configured to form a stop portion for the movement of the retaining member (151) and to lock the rotation of the balance wheel (121) in a second rotational direction (S2) opposite to the first rotational direction (S1) of the balance wheel (121).

4. The adjustment system (100) for a watch movement (200) according to claim 3, characterized in that the stop pawl (155) comprises a second beak portion (158b) formed by the joint between a second sliding surface (159) and a second stop surface (160), the second sliding surface (159) is configured to ensure that the stop pawl (155) rotates against the stop spring (154) when in contact with the retaining member (151), and to allow the retaining member (151) to move in a second rotational direction (S2) of the balance wheel (121), and the second stop surface (160) is configured to form a stop portion for the movement of the retaining member (151) and to lock the rotation of the balance wheel (121) in the first rotational direction (S1).

5. The adjustment system (100) for a watch movement (200) according to claim 1, characterized in that the first beak portion (158a) and the second beak portion (158b) are arranged symmetrically opposite to each other with respect to a plane passing through the rotation axis (A3) of the stop claw (155) and the vibration axis (A1) of the mechanical vibrator (120).

6. The adjustment system (100) for a watch movement (200) according to claim 5, characterized in that the stop claw (155) has a C-shape with the ends of the C-shape having the first beak portion (158a) and the second beak portion (158b).

7. The stopping device (150) sets the balance wheel (121) to an angular lock position (P) where the potential energy of the balance wheel is zero. 0 A predetermined angular position (P) having an angular lag between 120° and 180° relative to ) bloc , P bloc’ An adjustment system (100) for a watch movement (200) according to claim 1, characterized in that it is configured to lock the balance wheel (121) with a )

8. The stopping device (150) sets the balance wheel (121) to an angular lock position (P) where the potential energy of the balance wheel is zero. 0 A predetermined angular position (P) having an angular lag between 130° and 180° relative to ) bloc , P bloc’ An adjustment system (100) for a watch movement (200) according to claim 1, characterized in that it is configured to lock the balance wheel (121) with a )

9. The stop device (150) is at a predetermined angular position (P 0 ), which has an angular lag between 140° and 180° with respect to the angular lock position (P bloc of the template (121) where the potential energy of the template is zero, P bloc’ ), and is configured to lock the template (121). An adjustment system (100) for a timepiece movement (200) according to claim 1, characterized in that.

10. The stopping device (150) sets the balance wheel (121) to an angular lock position (P) where the potential energy of the balance wheel is zero. 0 A predetermined angular position (P) having an angular lag between 150° and 180° relative to ) bloc , P bloc’ An adjustment system (100) for a watch movement (200) according to claim 1, characterized in that it is configured to lock the balance wheel (121) with a )

11. Adjustment system (100) for a watch movement (200) according to claim 1, characterized in that the balance wheel (121) comprises a rim (122) attached to a central portion (124) by an arm (123), and the retaining member (151) is positioned at one level of the arm (123) or at the level of the rim (122).

12. The adjustment system (100) for a watch movement (200) according to claim 1, characterized in that the retaining member (151) is formed integrally with the balance wheel (121) or is formed by a pin, peg or stud driven into the balance wheel (121).

13. A watch movement (200) comprising the adjustment system (100) described in claim 1.

14. The watch movement (200) according to claim 13, characterized by comprising a direct impulse escapement that works in conjunction with the adjustment system (100).

15. The clock movement (200) according to claim 14, characterized in that the direct impulse escapement is a natural escapement.

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