EP2221677A1 - Detent escapement - Google Patents
Detent escapement Download PDFInfo
- Publication number
- EP2221677A1 EP2221677A1 EP09405029A EP09405029A EP2221677A1 EP 2221677 A1 EP2221677 A1 EP 2221677A1 EP 09405029 A EP09405029 A EP 09405029A EP 09405029 A EP09405029 A EP 09405029A EP 2221677 A1 EP2221677 A1 EP 2221677A1
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- EP
- European Patent Office
- Prior art keywords
- balance
- release
- rocker
- inertial
- finger
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B15/00—Escapements
- G04B15/06—Free escapements
Definitions
- the present invention relates to a detent escapement for a timepiece comprising a pendulum secured to a pulse element, an escape wheel whose toothing intersects the trajectory of the pulse element, a trigger rocker having a stop member and a release member, resilient biasing means for engaging the stop member in the path of the toothing of the escape wheel, and a finger or release pallet integral with the rotation of the rocker for engaging with the rocker release member once per swing period of the rocker arm to disengage the stop member of the toothing of the escape wheel.
- the impulse of the escape wheel on the pendulum pulse finger can only occur in a direction of rotation of the pendulum, either once per oscillation period or alternately in half, the alternation corresponding to half a oscillation period.
- This type of exhaust requires a release rocker which comprises firstly a stop element which cuts the path of the teeth of the escape wheel, and which further comprises a release element with which comes into engagement a release finger integral with the balance.
- this release finger must come into engagement with the release element only during the alternation during which the rocker receives a pulse from the escape wheel, the stop element having to remain in engagement with the impeller. exhaust during the other alternation.
- the release rocker comprises an elastic blade whose end free press against a stop of the rocker so that the blade causes the rocker in a direction of rotation of the rocker release finger, while in the opposite direction of rotation, the blade bends and lets the release finger without causing the release latch.
- the sizing of the flexible parts of the trigger is clearly one of the critical points in the development of this exhaust. It requires sufficient rigidity to keep the stop in its natural position but, at the same time, it is not necessary that the energy to release the escape wheel or to perform the relaxation function is too high, the risk being a disturbance non-negligible balance-balance oscillator, associated with a significant drop in yield, or even the system shutdown.
- the unlocking torque required for the release of the escape wheel also represents an operating safety (impact safety) which imposes a lower limit on the rigidity of the blade.
- the object of the present invention is to overcome, at least in part, the aforementioned drawbacks.
- this invention relates to a detent escapement for a timepiece according to claim 1.
- this exhaust does not present certain risks of conventional expansion exhausts. If a shock moves the inertial organ to its other extreme position, the consequences will not be of an unfortunate nature. In one case, the release finger will meet the release member instead of fading and move the inertial member to its correct position with negligible effort. In the other case, instead of coming into contact with the release element, the finger will not meet it, which will lose an impulse to the pendulum and an increment to the gear, this having no impact on the good watchmaking as it is only an occasional event.
- this exhaust reduces certain risks associated with the use of conventional expansion exhausts. Indeed, a shock applied to the timepiece may cause its balance to rotate beyond a normal operating angle, which leads, during the alternation where the pulse occurs, to a new release of the train of gear. There is a gallop, because two clearances and two pulses take place during the same alternation.
- the system object of the invention does not present this kind of problem because the release finger is at that moment already erased from the path of the unlocking element and does not cause the displacement of the blocker and therefore by a second pulse .
- the detent escapement comprises an escape wheel 1 connected to a mainspring (not shown) by a finishing train (not shown) which tends to rotate the escapement wheel 1 ( Figures 1 to 7 ) in the opposite direction to clockwise.
- a tooth of the escape wheel 1 bears against a stop element 2a, advantageously formed by a ruby paddle, of a release rocker 2.
- This release rocker 2 is biased by a spring 3 which tends to to hold it against a stop 4, position in which the stop pallet 2a is engaged in the path of the teeth of the escape wheel, so that a tooth of this wheel bears against the stop pallet 2a as illustrated by the figure 1 .
- the pulse and disengagement device associated with the pendulum pivot shaft is represented in detail by the Figures 8-10 . It comprises a circular plate 6 provided with a tubular element 6a designed to be driven on the balance shaft. This tubular element 6a has a partially circular outer section cut by two parallel outer flat faces 6b ( figure 8 ) on which is engaged a pulse ring 7, provided with an opening 7a ( figure 10 ) of complementary section to that of the outer section of the tubular element 6a.
- the impulse ring 7 is retained axially between two retaining rings 8a, 8b driven.
- the impulse ring 7 has a finger or impulse face 7b projecting from the outer lateral face of the impulse ring 7.
- the finger of the impulse ring may be an insert such as a pallet.
- Two pins 9 and 10, of semicircular sections in this example, are driven into two diametrically opposed openings 6c, 6d respectively and of corresponding sections, formed in the plate 6.
- An inertial member 11, elliptical in this example, is provided with three openings 11a, 11b, 11c, two openings 11a, 11b are off center and preferably symmetrical and diametrically opposed.
- One of these openings 11b is semicircular limited by two radii forming an angle greater than 180 ° to receive the pivot pin 10 of the inertial member 11 allowing it an angular displacement.
- the other opening is elongated 11a to receive the pin 9.
- the third opening is a central opening 11c for the clearance passage of the tubular portion 6a of the plate 6 and can be used, in the absence of the opening 11a and the ankle 9, to limit the displacement angular of the inertial member 11.
- a release finger 11d protrudes from the outer lateral face of the inertial member 11.
- This release finger 11d is of triangular shape in the example under consideration, with a radially oriented drive face. relative to the center of the inertial member 11 and an inclined face, as illustrated by the figure 8 .
- the release finger could also be formed by a palette reported ruby, as the finger 7b.
- the inclined face of the release finger 11d is used to push the inertial element 6 in the event that a shock would have moved to the projecting position when it should be in the retracted position.
- the inertial member 11 is disposed at the base of the tubular portion 6a.
- the openings 11a, 11b, 11c are arranged, dimensioned and shaped to allow the inertial member 11 to perform a limited angular displacement around the axis of the pin 10, which is parallel to the axis of the tray 6 driven on the pivot shaft of the balance, and which constitutes the pivoting member of the inertial member 11.
- the elongate opening 11a extends symmetrically to a diameter of the inertial element 11 passing through the respective axes of the openings 11b , 11c, so that the two limit positions of the inertial member 11 are respectively symmetrically on either side of the axis of pivoting of the balance.
- the axes of the two openings 11a, 11b occupy diametrically opposite and symmetrical positions relative to the center of the inertial member 11.
- the pins 9, 10 also occupy diametrically opposite positions and symmetrical relative to the center of the circular plate 6 to cooperate with the respective openings 11a, 11b.
- the angular position occupied by the inertial member 11 corresponds to that in which the release finger 11d protrudes outside the periphery of the circular plate 6.
- the radial face the triangular finger meets a clearance member 2b located at the free end of the release rocker 2, so that the release finger 11d raises the release rocker 2 against the pressure of the return spring 3, as illustrated by the figure 2 .
- the figure 4 illustrates the return of the release lever 2 under the pressure of the spring 3 against the stop 4 after the release of the rocker by the release finger 11d, so that when the tooth of the escape wheel is released by the finger d 7b impulse, another tooth of the escape wheel is stopped by the pallet 2a of the release lever 2, as illustrated by the figure 5 .
- This figure 5 also illustrates the reversal of the direction of rotation of the balance which passes from the rotation in the direction of clockwise to a rotation of opposite direction.
- the balance shaft is integral in rotation with the pulse finger 7b and the release finger 11d.
- the balance is braked by the spiral spring, and passes through a zero speed before being driven in the opposite direction of rotation.
- the inertial member 11 has two stable positions, each dependent on the direction of rotation of the balance.
- the Tests carried out show that the inertial member 11 moves before the pendulum has completed each of the two alternations making up its oscillation period, but its rotation around the ankle 10 begins around the neutral point of the pendulum (angle 0 of its position ).
- the pendulum In neutral, the pendulum has the maximum speed and thus passes from a positive acceleration to a negative acceleration (it starts to decelerate) and that is when the inertial effects begin to be felt.
- This behavior depends on the inertia of the inertial member 11, (material, geometry, in particular), of the friction between the inertial member 11 and the surfaces with which it is in contact, but it is also influenced by the effect of the centrifugal force acting on the center of mass of the inertial member 11 (offset relative to the axis of rotation of the balance) and which is added to the initial acceleration due to the balance.
- the inertial member 11 is moved clockwise about the axis of the pin 10. In this position, the release finger 11d is retracted inside the peripheral edge of the circular plate 6.
- the release finger 11d does not cooperate with the disengagement latch 2 as it passes opposite the disengagement member 2b, as illustrated by FIG. figure 6 .
- the clearance finger 11d has no elastic element to overcome to pass the obstacle of the element 2b of the trigger rocker 2 during the alternation of the balance where this one does not receive a maintenance pulse of its oscillating movement, since the finger disappears inside the circular periphery of the plate 6. There is therefore no loss of energy or disturbance of the pendulum swing period.
- the figure 11 is a diagram of the angular displacement of the balance during a period of oscillation. It is to be compared with the diagram of the figure 12 which shows the angular displacement of the inertial member 11 between its two limit positions determined by the two radial edges of the opening 11a alternately abutting against the pin 9 secured to the plate 6.
- the angular displacement of the inertial member 11 between its two limit positions is only a few degrees, typically of the order of 5 ° to 10 °, these two limit positions being located symmetrically on either side of the pivoting axis of the balance.
- This inertial member 11 may be made of a low specific mass material, the inertial effect being always sufficient to guarantee the function.
- the freedom of choice of the outer geometrical shape makes it possible to produce an inertial element of symmetrical shape, which guarantees a weak added imbalance.
- a sparse material such as silicon, the influence on the equilibrium of the balance is negligible.
- the inertial member 11 made of nickel can be produced by the LIGA technique with a small thickness, typically of the order of 0.10 to 0.15 mm, so that the influence on the equilibrium of the balance can be considered as being negligible.
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- General Physics & Mathematics (AREA)
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Abstract
Description
La présente invention se rapporte à un échappement à détente pour pièce d'horlogerie comprenant un balancier solidaire d'un élément d'impulsion, une roue d'échappement dont la denture coupe la trajectoire de l'élément d'impulsion, une bascule de détente présentant un élément d'arrêt et un élément de dégagement, des moyens de rappel élastique pour engager l'élément d'arrêt dans la trajectoire de la denture de la roue d'échappement, et un doigt ou une palette de dégagement solidaire en rotation du balancier pour venir en prise avec l'élément de dégagement de la bascule une fois par période d'oscillation du balancier pour dégager l'élément d'arrêt de la denture de la roue d'échappement.The present invention relates to a detent escapement for a timepiece comprising a pendulum secured to a pulse element, an escape wheel whose toothing intersects the trajectory of the pulse element, a trigger rocker having a stop member and a release member, resilient biasing means for engaging the stop member in the path of the toothing of the escape wheel, and a finger or release pallet integral with the rotation of the rocker for engaging with the rocker release member once per swing period of the rocker arm to disengage the stop member of the toothing of the escape wheel.
L'échappement à détente n'utilisant pas d'ancre entre la roue d'échappement et le balancier, l'impulsion de la roue d'échappement sur le doigt d'impulsion du balancier ne peut se produire que dans un sens de rotation du balancier, soit une fois par période d'oscillation ou une alternance sur deux, l'alternance correspondant à une demi-période d'oscillation.Since the detent escapement does not use an anchor between the escapement wheel and the balance wheel, the impulse of the escape wheel on the pendulum pulse finger can only occur in a direction of rotation of the pendulum, either once per oscillation period or alternately in half, the alternation corresponding to half a oscillation period.
Ce type d'échappement nécessite une bascule de dégagement qui comporte d'une part un élément d'arrêt qui coupe la trajectoire des dents de la roue d'échappement, et qui comporte d'autre part un élément de dégagement avec lequel vient en prise un doigt de dégagement solidaire du balancier. Or ce doigt de dégagement ne doit venir en prise avec l'élément de dégagement que durant l'alternance pendant laquelle le balancier reçoit une impulsion de la roue d'échappement, l'élément d'arrêt devant rester en prise avec la roue d'échappement durant l'autre alternance.This type of exhaust requires a release rocker which comprises firstly a stop element which cuts the path of the teeth of the escape wheel, and which further comprises a release element with which comes into engagement a release finger integral with the balance. However, this release finger must come into engagement with the release element only during the alternation during which the rocker receives a pulse from the escape wheel, the stop element having to remain in engagement with the impeller. exhaust during the other alternation.
Dans les échappements à détente classiques, la bascule de dégagement comporte une lame élastique dont l'extrémité libre appuie contre une butée de la bascule en sorte que la lame entraîne la bascule dans un sens de rotation du doigt de dégagement du balancier, alors que dans le sens de rotation inverse, la lame fléchit et laisse passer le doigt de dégagement sans entraîner la bascule de dégagement. Ceci permet d'éviter que la roue d'échappement tourne sans transmettre d'impulsion au balancier lors de l'une des deux alternances, comme dans le cas de l'échappement Robin, ce qui provoque une perte d'énergie et donc une baisse du rendement.In conventional expansion exhausts, the release rocker comprises an elastic blade whose end free press against a stop of the rocker so that the blade causes the rocker in a direction of rotation of the rocker release finger, while in the opposite direction of rotation, the blade bends and lets the release finger without causing the release latch. This makes it possible to prevent the escape wheel from rotating without transmitting a pulse to the balance during one of the two alternations, as in the case of the Robin exhaust, which causes a loss of energy and therefore a decrease performance.
Le dimensionnement des parties flexibles de la détente est clairement un des points critiques dans la mise au point de cet échappement. Il faut une rigidité suffisante pour garder la butée dans sa position naturelle mais, en même temps, il ne faut pas que l'énergie pour libérer la roue d'échappement ou pour effectuer la fonction de détente soit trop élevée, le risque étant une perturbation non-négligeable de l'oscillateur balancier-spiral, associée à une chute importante du rendement, voire l'arrêt du système. De plus, le couple de déverrouillage nécessaire pour la libération de la roue d'échappement représente aussi une sécurité de fonctionnement (sécurité aux chocs) qui impose une limite inférieure à la rigidité de la lame.The sizing of the flexible parts of the trigger is clearly one of the critical points in the development of this exhaust. It requires sufficient rigidity to keep the stop in its natural position but, at the same time, it is not necessary that the energy to release the escape wheel or to perform the relaxation function is too high, the risk being a disturbance non-negligible balance-balance oscillator, associated with a significant drop in yield, or even the system shutdown. In addition, the unlocking torque required for the release of the escape wheel also represents an operating safety (impact safety) which imposes a lower limit on the rigidity of the blade.
Ce mécanisme a été surtout employé dans la chronométrie de marine; il est délicat, exige une exécution parfaite et ne se prête guère à la fabrication en série. C'est par ailleurs un échappement excellent qui permet un réglage très précis et en conséquence les performances chronométriques les plus élevées. Cette solution est fragile et ne supporte pas les sollicitations que subissent les montres-bracelets au porter.This mechanism has been especially employed in marine chronometry; it is delicate, requires perfect execution and does not lend itself to mass production. It is also an excellent exhaust which allows a very precise adjustment and consequently the highest chronometric performances. This solution is fragile and does not support the stresses that wear wristwatches suffer.
On a proposé dans le
Cette solution, bien qu'intéressante, nécessite cependant toujours de vaincre la force du ressort spiral pour écarter le doigt lorsque la bascule de détente ne doit pas libérer la roue d'échappement, engendrant une interférence sur la période du balancier-spiral ainsi qu'une perte d'énergie.This solution, although interesting, however still requires to overcome the force of the spiral spring to spread the finger when the trigger rocker must not release the escape wheel, causing interference on the period of the balance spring and spiral a loss of energy.
Le but de la présente invention est de remédier, au moins en partie, aux inconvénients susmentionnés.The object of the present invention is to overcome, at least in part, the aforementioned drawbacks.
A cet effet, cette invention a pour objet un échappement à détente pour pièce d'horlogerie selon la revendication 1.For this purpose, this invention relates to a detent escapement for a timepiece according to
Grâce à cette disposition, il devient possible d'utiliser l'inertie d'un organe soumis au mouvement oscillatoire du balancier pour actionner le doigt de dégagement du balancier en fonction de son sens de rotation, en sorte que dans un sens de rotation, la trajectoire du doigt de dégagement passe par l'élément de dégagement de la bascule, alors que dans le sens de rotation contraire, cette trajectoire passe en dehors de cet élément de dégagement.With this arrangement, it becomes possible to use the inertia of an organ subjected to the oscillatory movement of the balance to actuate the release finger of the balance according to its direction of rotation, so that in a direction of rotation, the path of the release finger passes through the release member of the rocker, while in the opposite direction of rotation, this path passes outside this release element.
Il s'agit donc d'un échappement à détente dans lequel le doigt de dégagement ne doit plus vaincre de force élastique. De ce fait, il n'utilise donc aucune énergie pour écarter un organe élastique et ne crée aucune perturbation de la période d'oscillation du balancier, puisque le doigt de dégagement s'efface de l'élément de dégagement de la bascule de détente lors de l'alternance où la roue d'échappement n'est pas dégagée par la bascule et ne transmet par conséquent pas d'impulsion au balancier.It is therefore a detent escapement in which the release finger must no longer overcome elastic force. Therefore, it does not use any energy to remove an elastic member and does not create any disturbance of the pendulum swing period, since the release finger is removed from the release element of the trigger rocker when alternation where the escape wheel is not released by the rocker and therefore does not transmit impulse to the pendulum.
Le fonctionnement de cet échappement ne présente pas certains risques des échappements à détente classiques. Si un choc déplace l'organe inertiel dans son autre position extrême, les conséquences ne seront pas de nature fâcheuse. Dans un cas, le doigt de dégagement rencontrera l'élément de dégagement au lieu de s'effacer et déplacera l'organe inertiel dans sa position correcte avec un effort négligeable. Dans l'autre cas, au lieu de venir en prise avec l'élément de dégagement, le doigt ne le rencontrera pas, ce qui fera perdre une impulsion au balancier et un incrément au rouage, ceci n'ayant pas de répercussion sur la bonne marche de la montre dans la mesure où il ne s'agit que d'un évènement tout au plus occasionnel.The operation of this exhaust does not present certain risks of conventional expansion exhausts. If a shock moves the inertial organ to its other extreme position, the consequences will not be of an unfortunate nature. In one case, the release finger will meet the release member instead of fading and move the inertial member to its correct position with negligible effort. In the other case, instead of coming into contact with the release element, the finger will not meet it, which will lose an impulse to the pendulum and an increment to the gear, this having no impact on the good watchmaking as it is only an occasional event.
En outre, le fonctionnement de cet échappement réduit certains risques associés à l'utilisation des échappements à détente classique. En effet, un choc appliqué à la pièce d'horlogerie peut conduire son balancier à tourner au-delà d'un angle normal de fonctionnement, ce qui conduit, pendant l'alternance où se produit l'impulsion, à une nouvelle libération du train de rouage. Il se produit alors un galop, car deux dégagements et deux impulsions ont lieu pendant la même alternance. Le système objet de l'invention ne présente pas ce genre de problème car le doigt de dégagement est à ce moment-là déjà effacé de la trajectoire de l'élément de déverrouillage et ne provoque pas le déplacement du bloqueur et donc par de seconde impulsion.In addition, the operation of this exhaust reduces certain risks associated with the use of conventional expansion exhausts. Indeed, a shock applied to the timepiece may cause its balance to rotate beyond a normal operating angle, which leads, during the alternation where the pulse occurs, to a new release of the train of gear. There is a gallop, because two clearances and two pulses take place during the same alternation. The system object of the invention does not present this kind of problem because the release finger is at that moment already erased from the path of the unlocking element and does not cause the displacement of the blocker and therefore by a second pulse .
D'autres particularités et avantages de l'invention apparaîtront au cours de la description qui suit faite à l'aide des dessins annexés qui illustrent, schématiquement et à titre d'exemple, une forme d'exécution de l'échappement à détente objet de l'invention.
- Les
figures 1 à 7 montrent cet échappement à détente dans différentes positions, au cours d'une période d'oscillation du balancier; - la
figure 8 est une vue de dessous partielle de lafigure 1 ; - la
figure 9 est une vue en coupe selon la ligne IX-IX de lafigure 8 ; - la
figure 10 est une vue éclatée de la partie illustrée par lafigure 9 ; - la
figure 11 est un diagramme de déplacement angulaire du balancier sur une période d'oscillation, avec le temps en seconde sur l'abscisse et l'angle en degré sur l'ordonnée; - la
figure 12 est un diagramme du déplacement angulaire de l'élément inertiel pendant la période d'oscillation du balancier, avec le temps en seconde sur l'abscisse et l'angle en degré sur l'ordonnée.
- The
Figures 1 to 7 show this detent escapement in different positions, during a pendulum swing period; - the
figure 8 is a partial bottom view of thefigure 1 ; - the
figure 9 is a sectional view along the line IX-IX of thefigure 8 ; - the
figure 10 is an exploded view of the part illustrated by thefigure 9 ; - the
figure 11 is a diagram of angular displacement of the pendulum on a period of oscillation, with the time in second on the abscissa and the angle in degree on the ordinate; - the
figure 12 is a diagram of the angular displacement of the inertial element during the oscillation period of the pendulum, with the time in seconds on the abscissa and the angle in degree on the ordinate.
Les
L'échappement à détente comporte une roue d'échappement 1 reliée à un ressort de barillet (non représenté) par un rouage de finissage (non représenté) qui tend à faire tourner la roue d'échappement 1 (
Dans la position illustrée par la
Le dispositif d'impulsion et de dégagement associé à l'arbre de pivotement du balancier est représenté en détail par les
Deux chevilles 9 et 10, de sections semi-circulaires dans cet exemple, sont chassées dans deux ouvertures 6c, respectivement 6d diamétralement opposées et de sections correspondantes, ménagées dans le plateau 6.Two
Un organe inertiel 11, en forme d'ellipse dans cet exemple, est muni de trois ouvertures 11a, 11b, 11c, dont deux ouvertures 11a, 11b sont décentrées et de préférence symétriques et diamétralement opposées. Une de ces ouvertures 11b est semi-circulaire limitée par deux rayons formant un angle supérieur à 180° pour recevoir la cheville 10 de pivotement de l'organe inertiel 11 en lui permettant un déplacement angulaire. L'autre ouverture est allongée 11a pour recevoir la cheville 9. La troisième ouverture est une ouverture centrale 11c pour le passage avec jeu de la partie tubulaire 6a du plateau 6 et peut servir, en l'absence de l'ouverture 11a et de la cheville 9, à limiter le déplacement angulaire de l'organe inertiel 11. Un doigt de dégagement 11d fait saillie de la face latérale externe de l'organe inertiel 11. Ce doigt de dégagement 11d est de forme triangulaire dans l'exemple considéré, avec une face d'entraînement orientée radialement par rapport au centre de l'organe inertiel 11 et une face inclinée, comme illustré par la
Comme illustré sur la
Afin de minimiser l'impact sur l'équilibre du balancier, les axes des deux ouvertures 11a, 11b occupent des positions diamétralement opposées et symétriques par rapport au centre de l'organe inertiel 11. Les chevilles 9, 10 occupent aussi des positions diamétralement opposées et symétriques correspondantes par rapport au centre du plateau circulaire 6 pour coopérer avec les ouvertures respectives 11a, 11b.In order to minimize the impact on the balance of the balance, the axes of the two
Sur la
Dès que la roue d'échappement 1, maintenue en tension par le ressort de barillet à travers le rouage de finissage, est libérée, elle est entraînée dans le sens contraire à celui des aiguilles d'une montre de sorte qu'une dent de la roue d'échappement 1 rencontre le doigt d'impulsion 7b, transmettant directement la force du ressort de barillet au balancier, comme illustré par la
La
Cette
L'organe inertiel 11 présente deux positions stables, chacune dépendante du sens de rotation du balancier. Les essais effectués montrent que l'organe inertiel 11 se déplace avant que le balancier ait complété chacune des deux alternances composant sa période d'oscillation, mais sa rotation autour de la cheville 10 commence aux alentours du point mort du balancier (angle 0 de sa position).The
Au point mort, le balancier a la vitesse maximale et il passe donc d'une accélération positive à une accélération négative (il commence à décélérer) et c'est à ce moment-là que les effets inertiels commencent à se faire sentir.In neutral, the pendulum has the maximum speed and thus passes from a positive acceleration to a negative acceleration (it starts to decelerate) and that is when the inertial effects begin to be felt.
Ce comportement dépend de l'inertie de l'organe inertiel 11, (matière, géométrie, notamment), des frottements entre l'organe inertiel 11 et les surfaces avec lesquelles il est en contact, mais il est aussi influencé par l'effet de la force centrifuge qui agit sur le centre de masse de l'organe inertiel 11 (déporté par rapport à l'axe de rotation du balancier) et qui s'ajoute à l'accélération initiale due au balancier.This behavior depends on the inertia of the
Dans la phase illustrée par la
Par conséquent, le doigt de dégagement 11d ne coopère pas avec la bascule de dégagement 2 lorsqu'il passe vis-à-vis de l'élément de dégagement 2b, comme illustré par la
Lorsque le balancier B arrive à la fin de sa rotation dans le sens contraire de celui des aiguilles de la montre (
La
Le déplacement angulaire de l'organe inertiel 11 entre ses deux positions limites n'est que de quelques degrés, typiquement de l'ordre de 5° à 10°, ces deux positions limites se situant symétriquement de part et d'autre de l'axe de pivotement du balancier. Cet organe inertiel 11 peut être réalisé dans un matériau de faible masse spécifique l'effet inertiel étant toujours suffisant pour garantir la fonction. La liberté de choix de la forme géométrique extérieure permet de réaliser un élément inertiel de forme symétrique, ce qui garanti un balourd ajouté faible. L'expérience montre qu'avec un matériau peu dense comme le silicium l'influence sur l'équilibre du balancier est négligeable.The angular displacement of the
On peut réaliser l'organe inertiel 11 en nickel par la technique LIGA avec une faible épaisseur, typiquement de l'ordre de 0,10 à 0,15 mm, en sorte que l'influence sur l'équilibre du balancier peut être considérée comme étant négligeable.The
Claims (4)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09405029A EP2221677A1 (en) | 2009-02-16 | 2009-02-16 | Detent escapement |
EP09405206.5A EP2199875B1 (en) | 2008-12-16 | 2009-11-26 | Detent escapement |
US12/635,264 US7927008B2 (en) | 2008-12-16 | 2009-12-10 | Detent escapement |
JP2009281686A JP5406000B2 (en) | 2008-12-16 | 2009-12-11 | Detent escapement |
CN200910259158XA CN101750953B (en) | 2008-12-16 | 2009-12-15 | Detent escapement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09405029A EP2221677A1 (en) | 2009-02-16 | 2009-02-16 | Detent escapement |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2221677A1 true EP2221677A1 (en) | 2010-08-25 |
Family
ID=40937584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09405029A Withdrawn EP2221677A1 (en) | 2008-12-16 | 2009-02-16 | Detent escapement |
Country Status (1)
Country | Link |
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EP (1) | EP2221677A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2199875A2 (en) * | 2008-12-16 | 2010-06-23 | Rolex Sa | Detent escapement |
WO2011120180A1 (en) | 2010-04-01 | 2011-10-06 | Rolex S.A. | Immobilizing device for a toothed wheel |
EP2450755A1 (en) | 2010-11-04 | 2012-05-09 | Nivarox-FAR S.A. | Synchronous escapement for clockwork |
EP2645189A1 (en) * | 2012-03-29 | 2013-10-02 | Nivarox-FAR S.A. | Flexible escapement mechanism |
WO2013144237A1 (en) | 2012-03-29 | 2013-10-03 | Nivarox-Far S.A. | Flexible lever-free escapement mechanism |
WO2013144236A1 (en) | 2012-03-29 | 2013-10-03 | Nivarox-Far S.A. | Flexible escapement mechanism having a mobile frame |
WO2013144238A1 (en) | 2012-03-29 | 2013-10-03 | Nivarox-Far S.A. | Flexible escapement mechanism having a plate-free balance |
RU2749943C2 (en) * | 2016-10-18 | 2021-06-21 | Эта Са Мануфактюр Орложэр Сюис | Resonator for mechanical watches |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1538490A1 (en) | 2003-12-04 | 2005-06-08 | Montres Breguet S.A. | Detent escapement for wrist-watches |
-
2009
- 2009-02-16 EP EP09405029A patent/EP2221677A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1538490A1 (en) | 2003-12-04 | 2005-06-08 | Montres Breguet S.A. | Detent escapement for wrist-watches |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2199875A3 (en) * | 2008-12-16 | 2011-07-27 | Rolex Sa | Detent escapement |
EP2199875A2 (en) * | 2008-12-16 | 2010-06-23 | Rolex Sa | Detent escapement |
EP2818941A1 (en) | 2010-04-01 | 2014-12-31 | Rolex Sa | Device for locking a sprocket wheel |
WO2011120180A1 (en) | 2010-04-01 | 2011-10-06 | Rolex S.A. | Immobilizing device for a toothed wheel |
EP2450755A1 (en) | 2010-11-04 | 2012-05-09 | Nivarox-FAR S.A. | Synchronous escapement for clockwork |
US8439556B2 (en) | 2010-11-04 | 2013-05-14 | Nivarox-Far S.A. | Synchronous escapement for a timepiece mechanism |
EP2645189A1 (en) * | 2012-03-29 | 2013-10-02 | Nivarox-FAR S.A. | Flexible escapement mechanism |
WO2013144237A1 (en) | 2012-03-29 | 2013-10-03 | Nivarox-Far S.A. | Flexible lever-free escapement mechanism |
WO2013144236A1 (en) | 2012-03-29 | 2013-10-03 | Nivarox-Far S.A. | Flexible escapement mechanism having a mobile frame |
WO2013144238A1 (en) | 2012-03-29 | 2013-10-03 | Nivarox-Far S.A. | Flexible escapement mechanism having a plate-free balance |
US9075394B2 (en) | 2012-03-29 | 2015-07-07 | Nivarox-Far S.A. | Flexible escapement mechanism with movable frame |
US9207640B2 (en) | 2012-03-29 | 2015-12-08 | Nivarox-Far S.A. | Flexible escape mechanism with no pallet lever |
US9304493B2 (en) | 2012-03-29 | 2016-04-05 | Nivarox-Far S.A. | Flexible escapement mechanism having a balance with no roller |
RU2749943C2 (en) * | 2016-10-18 | 2021-06-21 | Эта Са Мануфактюр Орложэр Сюис | Resonator for mechanical watches |
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