EP4194959A1 - Natural escapement for timepiece movement and timepiece movement comprising such an escapement - Google Patents

Abstract

The invention relates to a natural escapement (1) for a watch movement carrying out a succession of operating cycles each consisting of a first and a second alternation of a balance wheel (16) which comprises a balance wheel (18) on an axis (20) of which a balance plate (22) is fitted, this natural escapement (1) comprising a first escapement wheel set provided with at least one first toothing (10), this first escapement wheel set, arranged to be driven by a wheel set of the gear train of the timepiece movement, in turn driving a second escape wheel set provided with at least one second toothing (38), the first and second escape wheel sets forming a kinematic chain arranged to cooperate with an anchor (30) capable of pivoting around an anchor rod (32), the balance plate (22) carrying a second impulse pallet (28) by which this balance plate (22) receives a direct and tangential driving impulse of the first escapement wheel set during the first alternation, and a first impulse pallet (26) by which this balance plate (22) receives a direct and tangential driving impulse from the second escapement wheel set (12) during the second alternation, the balance plate (22) also carrying at least one first safety tooth (52) arranged to cooperate with the toothing (10, 38) of one of the first and second wheels of escapement so as to block this first or this second escape wheel when it escapes the second impulse pallet (28), respectively the first impulse pallet (26).The invention also relates to a movement of clockwork comprising such a natural escapement (1).

Description

Technical field of the invention

The present invention relates to a natural escapement for a clock movement also known by its name tangential impulse escapement. The present invention relates more particularly to a natural escapement protected against the damage that may be caused by premature triggering of the escapement pulse.

Technology background

The principle of the natural escapement was imagined by Abraham Louis Breguet at the beginning of the 19th century. Breguet's natural escapement has the particular advantage of being a free escapement insofar as the balance is only disturbed by the operation of the escapement over a small fraction of its oscillation. Breguet's natural escapement also has the advantage of giving each alternation a direct and tangential impulse to the balance wheel. In other words, the energy is transferred directly from the escape wheel to the balance wheel, without passing through an anchor. Furthermore, the transmission of energy takes place only tangentially, so that the friction generated by the operation of this escapement is limited. Contrary to a detent escapement, a natural escapement does not present a lost blow in its function of maintaining the oscillations of the balance wheel; it delivers a similar pulse at each alternation, in a symmetrical and more uniform way, so that the losses of mechanical energy by lost blow are eliminated. All these qualities thus make the natural exhaust one of the potentially most efficient exhausts.

Nevertheless, Breguet later discovered that the natural escapement he had imagined had certain drawbacks, foremost among which is the fact that the last escapement wheel is not under the tension of the gear train when the first wheel gives the impulse or when the latter is at rest. The different sets of gears and the manufacturing quality of the various components that go into the composition of a natural Breguet escapement can thus cause incorrect positioning of the last escapement wheel and, consequently, poor functioning of the escapement s 'accompanied by extraneous noises. Furthermore, since the escape wheel is free, its position is unstable, so that the safety of operation of such a natural escapement is poor.

Of course, many improvements have been made to the original Breguet natural escapement in an attempt to overcome the drawbacks mentioned above. Nevertheless, despite the efforts of successive watch manufacturers, difficulties persist. Some watchmakers have thus proposed superimposing the two escapement wheels, a solution which, of course, increases the thickness of the movement and makes it difficult to integrate such a movement into a watch case. Other watch manufacturers have for their part proposed positioning the lever between the two escapement wheels, in the plane of the latter. Again, such a solution is cumbersome, this time in the plane of movement. In addition, whether the escapement wheels are superimposed or whether the anchor is placed between the two escapement wheels, it has been realized in use that watchmakers experience difficulties in accessing the various components of the escapement, in particular when it came to adjusting the depth of penetration of the teeth of the second escape wheel with the anchor entry and exit pallets. Moreover, when an exhaust operates at low amplitude, at the end of the autonomy of the mainspring for example, or when the watchmaker performs control manipulations and retains the balance wheel for this purpose, it may happen that a triggering of the The impulse occurs when neither of the two impulse pallets carried by the balance plate is engaged within the perimeter of rotation of the teeth of one or the other of the escape wheels. Generally, such a malfunction occurs when neither of the two impulse pallets has yet arrived within the perimeter of rotation of the teeth of one or the other of the escape wheels and that the impulse tooth of the wheel escapement passes in front of the impulse pallet without giving impulse to the latter. This situation is observed when the balance wheel rotates too slowly with a low amplitude, or when the watchmaker manipulates the balance wheel. In such cases, the escape wheels are not restrained by the escapement function and may spin uncontrollably. This then causes at best a loss of the timepiece function with an undesired advance, and at worst a sudden stop after acceleration of the gear train in one or other of its rest positions which can lead to deterioration of the components of the gear train and the escapement.

Summary of the invention

The object of the present invention is to remedy the problems mentioned above as well as still others by providing a natural escapement for a watch movement which is protected against premature triggering.

To this end, the present invention relates to a natural escapement for a watch movement carrying out a succession of operating cycles each consisting of a first and a second alternation of a balance which comprises a balance wheel on an axis of which is adjusted a balance plate, this natural escapement comprising a first escapement wheel set provided with at least one first toothing, this first escapement wheel set, arranged to be driven by a wheel of the gear train of the clockwork movement, in turn driving a second escapement wheel set provided with at least one second toothing, the first and second escapement wheel sets forming a kinematic chain arranged to cooperate with an anchor capable of pivoting around of an anchor rod, the balance plate carrying a second impulse pallet by which this balance plate receives a direct and tangential driving impulse from the first escapement wheel set during the first alternation, and a first impulse by which this balance plate receives a direct and tangential driving impulse from the second escapement wheel set during the second alternation, the balance plate also carrying at least one first safety tooth arranged to cooperate with the toothing of one of the first and second escape wheels so as to block this first or second escape wheel when it escapes from the second impulse pallet, respectively from the first impulse pallet.

• le plateau de balancier porte une première dent de sécurité agencée pour coopérer avec la denture du premier mobile d'échappement, et une seconde dent de sécurité agencée pour coopérer avec la denture du second mobile d'échappement ;
• la ou les première et seconde dents de sécurité sont faites d'une pièce avec le plateau de balancier ;
• la ou les première et seconde dents de sécurité sont rapportées sur le plateau de balancier.

According to special embodiments of the invention:

• the balance plate carries a first safety tooth arranged to cooperate with the toothing of the first escapement wheel set, and a second safety tooth arranged to cooperate with the toothing of the second escapement wheel set;
• the at least one first and second safety teeth are made in one piece with the balance plate;
• the first and second safety tooth(s) are attached to the balance plate.

The invention also relates to a timepiece movement comprising an escapement of the type described above.

Thanks to these characteristics, the present invention provides a natural escape protected against the damage that a premature triggering of the impulse can cause. Indeed, by teaching to equip the balance plate with at least one safety tooth arranged in such a way that this safety tooth is engaged in the perimeter of rotation of the teeth of the escapement wheel set before the corresponding impulse pallet is engaged in this same rotation perimeter escapement mobiles, the present invention makes it possible to retain the escapement mobiles when the latter are not retained by the escapement function and to prevent these escapement mobiles from rotating without control.

Brief description of figures

• la figure 1 est une vue d'ensemble d'un échappement naturel ;
• la figure 2A est une vue de l'échappement naturel de la figure 1 dans sa première position extrême au début d'un cycle ;
• la figure 2B est une vue de l'échappement naturel dans sa position de repos lors de la première alternance au moment où le plateau de balancier est sur le point de faire pivoter l'ancre ;
• la figure 2C est une vue de l'échappement naturel au moment où le second mobile d'échappement est libéré de sa prise avec la palette de sortie, ce qui permet au mobile de seconde d'entraîner, via le premier mobile d'échappement, ce second mobile d'échappement, le premier mobile d'échappement donnant en outre, par sa dent d'impulsion, une impulsion motrice dite directe et tangentielle à la palette d'impulsion du plateau de balancier ;
• la figure 2D est une vue de l'échappement naturel au moment où le pivotement du second mobile d'échappement est à nouveau interrompu lorsque, sous l'effet du pivotement de l'ancre, ce second mobile d'échappement se retrouve en appui sur la palette d'entrée ;
• la figure 2E est une vue de l'échappement naturel au moment où le plateau de balancier se trouve dans sa seconde position extrême dans laquelle il est complètement écarté de sa position de repos, ce qui marque la fin de la première alternance de fonctionnement de l'échappement naturel ;
• la figure 2F est une vue de l'échappement naturel au moment où, lors de la seconde alternance, le plateau de balancier est revenu dans sa position de repos et est sur le point de faire à nouveau pivoter l'ancre ;
• la figure 2G est une vue de l'échappement naturel au moment où le second mobile d'échappement est libéré de sa prise avec la palette d'entrée, ce qui permet au mobile de seconde d'entraîner, via le premier mobile d'échappement, ce second mobile d'échappement ;
• la figure 2H est une vue de l'échappement naturel au moment où le second mobile d'échappement donne une impulsion motrice dite directe et tangentielle au plateau de balancier via l'une de ses dents qui entraîne la seconde palette d'impulsion ;
• la figure 2I est une vue de l'échappement naturel au moment où le pivotement du second mobile d'échappement est à nouveau interrompu lorsque, sous l'effet du pivotement de l'ancre, ce second mobile d'échappement se retrouve en appui sur la palette de sortie ;
• la figure 2J est une vue de l'échappement naturel de retour dans sa première position extrême, ce qui marque la fin du cycle de fonctionnement de l'échappement naturel selon l'invention ;
• la figure 3 est une vue de l'échappement naturel de la figure 1 avec le plateau de balancier muni d'une première et d'une seconde dent de sécurité conformément à l'invention, et
• la figure 4 est une vue analogue à celle de la figure 3 sur laquelle l'une des dents de sécurité du plateau de balancier empêche la rotation du second mobile d'échappement alors que le balancier n'avait pas une vitesse suffisante pour amener la seconde palette d'impulsion dans le périmètre de rotation de la seconde dent d'impulsion du second mobile d'échappement.

Other characteristics and advantages of the present invention will emerge more clearly from the following detailed description of an embodiment of a natural escapement according to the invention, this example being given purely by way of illustration and not limitation only in connection with the attached drawing on which:

• there figure 1 is an overview of a natural escapement;
• there figure 2A is a natural exhaust view of the figure 1 in its first extreme position at the start of a cycle;
• there figure 2B is a view of the natural escapement in its rest position during the first alternation at the moment when the balance plate is about to cause the anchor to pivot;
• there Fig. 2C is a view of the natural escapement at the moment when the second escapement wheel set is released from its grip with the output pallet, which allows the second wheel set to drive, via the first escapement wheel set, this second wheel set escapement, the first escapement mobile also giving, via its impulse tooth, a so-called direct and tangential driving impulse to the impulse pallet of the balance plate;
• there 2D figure is a view of the natural escapement at the moment when the pivoting of the second escapement wheel set is again interrupted when, under the effect of the pivoting of the lever, this second escapement wheel set rests on the pallet d 'entrance ;
• there figure 2E is a view of the natural escapement at the moment when the balance plate is in its second extreme position in which it is completely moved away from its rest position, which marks the end of the first alternation of operation of the natural escapement ;
• there figure 2F is a view of the natural escapement at the moment when, during the second alternation, the balance plate has returned to its rest position and is about to pivot the anchor again;
• there figure 2G is a view of the natural escapement at the moment when the second escapement wheel set is released from its grip with the input pallet, which allows the second wheel set to drive, via the first escapement wheel set, this second exhaust mobile;
• there figure 2H is a view of the natural escapement when the second escapement wheel gives a so-called direct and tangential drive impulse to the balance plate via one of its teeth which drives the second impulse pallet;
• there Figure 2I is a view of the natural escapement at the moment when the pivoting of the second escapement wheel set is again interrupted when, under the effect of the lever pivoting, this second escapement wheel set comes to rest against the exit ;
• there figure 2J is a view of the natural escapement returning to its first extreme position, which marks the end of the operating cycle of the natural escapement according to the invention;
• there picture 3 is a natural exhaust view of the figure 1 with the balance plate provided with a first and a second safety tooth in accordance with the invention, and
• there figure 4 is a view analogous to that of the picture 3 on which one of the safety teeth of the balance plate prevents rotation of the second escapement wheel set when the balance wheel did not have sufficient speed to bring the second impulse pallet into the perimeter of rotation of the second tooth pulse of the second escape wheel set.

Detailed description of the invention

The present invention proceeds from the general inventive idea which consists in providing the balance plate of a natural escapement for a clock movement with at least one safety tooth which is arranged so that this safety tooth engages with the toothing of one of the escapement wheels when the corresponding impulse pallet carried by the balance plate is not yet engaged within the perimeter of rotation of the toothing of this escapement wheel. The present invention thus makes it possible to retain the escapement wheels when they are not retained by the escapement function and to prevent these escapement wheels from rotating without control, which can cause a loss of the function. timepiece with an undesired advance, or even, in the most unfavorable cases, a sudden stop after acceleration in the position rest that may cause damage to certain components of the mechanism.

Designated as a whole by the general reference numeral 1, the natural escapement is arranged to be driven by a wheel set of the gear train of the clockwork movement, for example the second wheel set 2, which meshes with a pinion 4 mounted fixed on an axis 6 of a first escape wheel set which, in the example shown in figure 1 , consists of a first escapement wheel 8. This first escapement wheel 8 in turn meshes via a toothing 10 with a second escapement mobile which, in the example shown in the drawing, consists of a second escape wheel 12 which pivots around an axis 14.

The natural escapement 1 also comprises a balance wheel 16 which comprises a balance wheel 18 on an axis 20 of which is fitted a balance plate 22. This balance plate 22 carries a balance peg 24 as well as a first and a second pulse pallet 26 and 28 whose respective roles will be described below.

The natural escapement 1 finally comprises an anchor 30 pivoted around an anchor rod 32 and which carries an exit pallet 34 and an entry pallet 36. Thanks to these exit 34 and entry 36 pallets which penetrate in a set of teeth 38 of the second escapement wheel 12, the anchor 30 is able to alternately block and release this second escapement wheel 12. The anchor 30 also comprises a fork 40 formed of a first and a a second horn 42a and 42b and which carries a dart 44. This dart 44 cooperates with the balance plate 22 and has the function of preventing accidental movements of the fork 40 outside the periods called lifting angle during which the plate balance 22 is close to its rest position. The anchor 30 is placed after the second escapement wheel 12, at the output of the kinematic chain formed by the first and second escapement wheels 8 and 12. More specifically, according to the non-limiting embodiment shown in the drawing, the pivot point of the anchor 30, materialized by the anchor rod 32, is outside the angle α of less than 180° and delimited by two straight lines which pass through the axis 20 of the balance wheel 18 and through the axis 6 of the first escapement wheel 8 for one, and through the axis 20 of the balance wheel 18 and through the axle 14 of the second escape wheel 12 for the other. The natural escapement 1 is therefore less bulky than the natural escapements of the prior art in which the anchor is usually placed between and above the first and second escapement wheels. The natural escapement 1 is therefore simpler to accommodate in the clock movement whose operation it regulates. Similarly, the arrangement of the lever 30 at the end of the kinematic chain formed by the first and second escapement wheels 8 and 12 makes the interventions of the watchmaker less difficult, in particular as regards measurement and adjustment of the depth of penetration of the exit 34 and entry 36 pallets in the toothing 38 of the second escapement wheel 12. The natural escapement 1 is completed by a first and a second stop 46a and 46b which limit the movement of the anchor 30 in pivoting.

In the mode of execution of the natural escapement 1 illustrated in the drawing, it is assumed that the second mobile 2 which supplies the natural escapement 1 with the energy necessary for its operation rotates counterclockwise. . The second mobile 2 therefore tends to rotate the pinion 4 and the first escapement wheel 8 on the axis 6 of which the pinion 4 is fixed in the clockwise direction, and the second escapement wheel 12 in the clockwise direction. counterclockwise.

An operating cycle of the natural escapement 1 comprises two alternations during which the balance plate 22 goes successively from a first extreme position to a second extreme position, passing through a median rest position, then from its second extreme position. to its first extreme position by ironing a second times by its middle resting position. Thus, at the start of a cycle (see figure 2A ), the second escapement wheel 12 rests on the outlet pallet 34 and the natural escapement 1 is blocked by pressing the lever 30 against the second stop 46b. Indeed, the pulling angle formed by pressing the tip of the tooth of the second escapement wheel 12 on the output pallet 34 opposes a resistance to the release of the anchor 30 by tending to make this anchor 30 pivot in counterclockwise against the second stop 46b. This function of pulling the lever 30 onto the second stop 46b by the second escapement wheel 12 during the free part of the alternation of the balance plate 22 is similar to that of Swiss lever escapements. The balance plate 22 then leaves this first extreme position by rotating counterclockwise.

At some point during his movement during the first alternation (see figure 2B ), the balance plate 22 arrives in its middle rest position. Just before reaching this position, the balance plate 22 abuts by its balance pin 24 against the second horn 42b of the fork 40 and causes the lever 30 to pivot clockwise.

The clockwise pivoting of the anchor 30 has the effect of releasing the second escapement wheel 12 from its grip with the output pallet 34, which allows the second mobile 2 to drive, via the first escapement wheel escapement 8, the second escapement wheel 12 counterclockwise (see Fig. 2C ).

The pivoting of the second escapement wheel 12 is again interrupted when, under the effect of the pivoting of the lever 30, this second escapement wheel 12 finds itself resting on the inlet pallet 36, this position being retained thanks to the support of the anchor 30 against the first stop 46a (see 2D figure ). Indeed, the draw angle formed by resting the tip of the tooth of the second escapement wheel 12 on the entry pallet 36 opposes a resistance to the release of the anchor 30 by tending to cause this anchor 30 to pivot clockwise against the first stop 46a. This function of pulling the lever 30 onto the first stop 46a by the second escapement wheel 12 during the free part of the alternation of the balance plate 22 is similar to that of Swiss lever escapements.

It will be noted that at the same time as the first escapement wheel 8 drives the second escapement wheel 12 in counterclockwise pivoting, the first escapement wheel 8 also gives a driving impulse to the balance plate 22 via the one of its teeth 48 called the impulse tooth which drives the second impulse pallet 28 (see Fig. 2C ). This driving impulse is called direct and tangential impulse because it is given directly by the first escapement wheel 8 to the balance plate 22 and the path of the impulse tooth 48 catches up with that of the second impulse pallet 28 of the plate. of pendulum 22 tangentially, which allows an almost punctual contact and without friction.

The balance plate 22 thus moves to its second extreme position in which it is completely moved away from its rest position, which marks the end of the first alternation of operation of the natural escapement 1 (see figure 2E ).

At the start of the second alternation of operation of the natural escapement 1, the balance plate 22, returned by the spiral spring of the balance (not visible in the drawing), begins to turn clockwise until it abuts by its balance pin 24 against the first horn 42a of the fork 40 and causes the lever 30 to pivot counterclockwise (see figure 2F ).

The anti-clockwise pivoting of the anchor 30 has the effect of releasing the second escape wheel 12 from its grip with the input pallet 36, which allows the second wheel set 2 to drive, via the first escape wheel 8, the second escape wheel 12 counterclockwise (see figure 2G ).

The pivoting of the second escapement wheel 12 is again interrupted when, under the effect of the pivoting of the anchor 30, this second escapement wheel 12 finds itself resting on the outlet pallet 34, this position being retained thanks to the support of the anchor 30 against the second stop 46b (see Figure 2I ).

It will be noted that at the same time as the first escapement wheel 8 drives the second escapement wheel 12 in counterclockwise pivoting, the second escapement wheel 12 also gives a so-called direct and tangential drive impulse to the balance plate 22 via one of its teeth 50 called the impulse tooth which drives the first impulse pallet 26 (see figure 2H ). The impulse is so named because it is given directly by the second escapement wheel 12 to the balance plate 22 and the path of the impulse tooth 50 catches up with that of the second impulse pallet 28 of the balance plate 22 tangentially, which allows an almost punctual and frictionless contact. The balance plate 22 thus returns to its first extreme position, which marks the end of an operating cycle of the natural escapement 1 (see figure 2J ).

There picture 3 is a natural exhaust view of the figure 1 with the balance plate 22 provided with a first and a second safety tooth 52, 54 in accordance with the invention. As already detailed above, the natural escapement 1 performs a succession of operating cycles each consisting of a first and a second alternation of the balance 16 which comprises a balance wheel 18 on the axis 20 of which is adjusted the balance plate 22. This natural escapement 1 comprises a first escapement wheel 8 provided with a first toothing 10 and which is arranged to be driven by the second mobile 2. In turn, this first escapement wheel 8 causes a second escapement wheel 12 provided with a second toothing 38, these first and second escapement wheels 8, 12 forming a kinematic chain following which is placed the anchor 30 capable of pivoting around its anchor rod 32. The balance plate 22 carries a second impulse pallet 28 by which this balance plate 22 receives a direct and tangential driving impulse from the first escapement wheel 8 during the first alternation, and a first impulse pallet 26 by which this balance plate 22 receives a direct and tangential driving impulse from the second escapement wheel 12 during the second alternation. In accordance with the invention, and as illustrated in figure 4 , the balance plate 22 also carries at least one first safety tooth 52 arranged to cooperate with the toothing 10 of the first escapement wheel 8, so as to block this first escapement wheel 8 when it rotates before the second impulse paddle 28 is within its perimeter of rotation. Thus, by teaching to provide the balance plate 22 with at least one safety tooth 52 arranged so that this safety tooth 52 is engaged in the perimeter of rotation of the toothing 10 of the corresponding escape wheel 8 before this impulse pallet 28 is not engaged in this same perimeter of rotation of the escape wheel 8, the present invention makes it possible to retain the escape wheel 8 when the latter is not retained by the escapement function and to prevent the escape wheels 8, 12 from rotating without control. According to a special embodiment of the invention, the balance plate 22 illustrated in figure 4 carries, in addition to the first safety tooth 52 which is arranged to cooperate with the toothing 10 of the first escapement wheel 8, a second safety tooth 54 arranged to engage in the toothing 38 of the second escapement wheel 12 before the first impulse pallet 26 is engaged in the perimeter of rotation of the first escapement wheel set 12. This is the case on the figure 4 where we see that only the safety tooth 54 is engaged in the toothing 38 of the second escapement wheel 12 and thus ensures the retention of the escapement wheels 8, 12.

It goes without saying that the present invention is not limited to the embodiment which has just been described and that various simple modifications and variants can be envisaged by those skilled in the art without departing from the scope of the invention as defined. by the claims appended to this patent application. It will be noted in particular that the first and/or second safety teeth 52, 54 can be made in one piece with the balance plate 22, or else be attached to this balance plate 22. The present invention also relates to a movement of clockwork fitted with a natural escapement of the type described above. It also goes without saying that the present invention is not limited to the particular type of natural exhaust which has just been described and that it can be applied to other versions of natural exhaust.

Nomenclature

1.

Natural exhaust

2.

Movable second

4.

Pinion

6.

Axis

8.

First escape wheel

10.

Teeth

12.

Second escape wheel

14.

Axis

16.

Pendulum

18.

balance wheel

20.

Axis

22.

Balance plate

24.

Pendulum pin

26.

First impulse paddle

28.

Second impulse paddle

30.

Anchor

32.

Anchor rod

34.

Output pallet

36.

Input pallet

38.

Teeth

40.

Fork

42a, 42b.

horns

44.

Stinger

46a.

First stop

46b.

Second stop

48.

Pulse tooth

50.

Pulse tooth

52.

First safety tooth

54.

Second safety tooth

Claims (5)

Natural escapement (1) for a clock movement carrying out a succession of operating cycles each consisting of a first and a second alternation of a balance wheel (16) which comprises a balance wheel (18) on an axis (20 ) from which a balance plate (22) is fitted, this natural escapement (1) comprising a first escapement wheel set provided with at least one first toothing (10), this first escapement wheel set, arranged to be driven by a wheel set of the gear train of the clockwork, in turn driving a second escapement wheel set provided with at least one second toothing (38), the first and second escapement wheel set forming a kinematic chain arranged to cooperate with an anchor (30) capable of pivoting around an anchor rod (32), the balance plate (22) carrying a second impulse pallet (28) by which this balance plate (22) receives a direct driving impulse and movement of the first escapement wheel set during the first alternation, and a first impulse pallet (26) via which this balance plate (22) receives a direct and tangential driving impulse from the second escapement wheel set during the second alternation , the balance plate (22) also carrying at least one first safety tooth (52) arranged to cooperate with the toothing (10, 38) of one of the first and second escapement mobiles so as to block this first or this second escape mobile when it escapes the second impulse pallet (28), respectively the first impulse pallet (26). Natural escapement (1) according to Claim 1, characterized in that the balance plate (22) carries a first safety tooth (52) arranged to cooperate with the toothing (10) of the first escapement wheel set, and a second tooth safety (54) arranged to cooperate with the toothing (38) of the second escape wheel set. Natural escapement (1) according to one of Claims 1 and 2, characterized in that the first and second safety tooth(s) (52, 54) are made in one piece with the balance plate (22). Natural escapement (1) according to one of Claims 1 and 2, characterized in that the first and second safety tooth(s) (52, 54) are attached to the balance plate (22). Clockwork movement comprising a natural escapement (1) according to one of Claims 1 to 4.

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