EP4160320A1 - Timepiece mechanism - Google Patents

Timepiece mechanism Download PDF

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Publication number
EP4160320A1
EP4160320A1 EP21200712.4A EP21200712A EP4160320A1 EP 4160320 A1 EP4160320 A1 EP 4160320A1 EP 21200712 A EP21200712 A EP 21200712A EP 4160320 A1 EP4160320 A1 EP 4160320A1
Authority
EP
European Patent Office
Prior art keywords
wheel
barrel
winding
star
crown
Prior art date
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.)
Pending
Application number
EP21200712.4A
Other languages
German (de)
French (fr)
Inventor
Didier VUILLEMIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP21200712.4A priority Critical patent/EP4160320A1/en
Publication of EP4160320A1 publication Critical patent/EP4160320A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/08—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously by parts of the cases
    • G04B3/10—Protecting means preventing overwinding
    • 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
    • G04B27/00—Mechanical devices for setting the time indicating means
    • G04B27/004—Mechanical devices for setting the time indicating means having several simultaneous functions, e.g. stopping or starting the clockwork or the hands
    • 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • 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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/06—Keys or the like with means preventing overwinding

Definitions

  • the present invention relates to a horological mechanism for a hand-wound watch comprising a winding mechanism and a barrel, designed to avoid any risk of excess tension on the barrel spring during its winding.
  • the invention also relates to a timepiece comprising such a mechanism.
  • the barrel of a watch is an assembly generally made up of a barrel drum, a barrel spring, a barrel arbor and a barrel cover.
  • the shaft serves as a pivot for the drum.
  • the mainspring is housed in the drum and fixed by its inner coil to the barrel arbor and by its outer coil to the barrel drum.
  • the lid closes the box; it pivots around the shaft. Winding is typically done by means of a ratchet made integral in rotation with the barrel arbor via a square.
  • the over-tensioning of the barrel spring corresponds to too great a state of winding. It has several drawbacks. It can, among other things, be the cause of rebate in the balance wheel and therefore affect chronometry. It can also lead to the breakage of the flange or of another element such as the winding stem or a wheel in the kinematic winding chain.
  • the winding of the spring continues when it has reached its maximum tension in the barrel.
  • a rigid attachment of the outer coil of the spring to the barrel drum would lead to an overtension of the barrel spring and would risk, among other things, damage the watch.
  • the mainspring is not hooked to the barrel but is fixed by its outer end to a blade which presses against the walls of the barrel drum and takes up a little more than one turn. This blade, called a sliding flange, allows the spring to wind normally. Then, when the mainspring reaches a certain level of winding, the last coil of the mainspring slides against the drum.
  • An overvoltage which may go so far as to cause the breakage of the barrel spring or of a component of the winding device may also occur in a manually wound watch, in particular if the user forces the winding stem.
  • the use of a sliding strap has the disadvantage of occupying one turn of the barrel and therefore of reducing the power reserve of the watch compared to a watch comprising a barrel of equivalent size but not comprising a sliding strap.
  • the use of a barrel with a sliding flange does not allow the user who manually winds his watch to feel whether the spring is fully wound. Thus, such a barrel is not suitable in a hand-wound watch.
  • the use of a slipping flange can lead to the accumulation of debris inside the barrel and then cause malfunctions.
  • An object of the present invention is to provide a watch mechanism comprising a barrel spring and a manually operable winding mechanism, said watch mechanism avoiding any overvoltage, in particular any risk of breakage of the barrel spring, during its winding, and alleviating at least in part the aforementioned drawbacks.
  • the mechanism according to the invention will also make it possible to give sensory information, typically tactile or acoustic, allowing the user of the watch to know that the latter has reached an optimal level of winding.
  • the present invention relates to a timepiece mechanism comprising a winding mechanism and a barrel.
  • the watch mechanism according to the invention is designed so that the kinematic chain going from the winding pinion to the arbor or to the barrel drum comprises a release wheel, said wheel being designed to disengage when the torque delivered by the barrel spring exceeds a predetermined threshold value.
  • This threshold value corresponds to a so-called optimal winding of the barrel spring, that is to say a winding enabling it to deliver the greatest possible torque without however being subjected to an overvoltage.
  • the release wheel assembly comprises a first wheel, a second wheel and a coaxial spider as well as a pawl or jumper fixed to one of said two wheels and positioning the latter relative to the star, the star being integral with the other of said two wheels.
  • Said first and second wheels are typically toothed wheels.
  • the release wheel assembly comprises a first wheel, typically toothed, and a coaxial spider as well as at least one pawl or jumper fixed to said first wheel and positioning the latter relative to the star.
  • the first wheel and the star are coaxial with the barrel arbor, the first wheel is mounted free to rotate around the arbor and the star is integral in rotation with the arbor.
  • the wheel which carries said at least one jumper and said pawl or jumper form a one-piece assembly.
  • said at least one pawl or jumper is integral with the wheel that carries it.
  • the invention also relates to a timepiece such as a wristwatch, a pocket watch, a clock or a clock comprising such a clockwork mechanism.
  • a watch mechanism 1 according to a first embodiment of the invention comprises a barrel and a winding mechanism for this barrel.
  • the barrel of the mechanism 1 traditionally comprises a barrel drum 2 comprising a toothing 21, a barrel arbor 3 rotatable about an axis A in the drum 2 and a barrel spring (not visible in the figures) housed in this drum 2.
  • the inner turn of this spring is typically fixed on a hook carried by a bung of the shaft 3 and its outer turn is fixed on the inner surface of the drum to ensure the drive of the drum 2.
  • the winding mechanism of mechanism 1 comprises a winding stem 4, a winding pinion 5, a crown mobile 6, a ratchet 7 mounted on the shaft 3 and secured in rotation to the latter by a square.
  • the winding pinion 5 is mounted, in the traditional way, free to rotate on the winding stem 4. It is made integral in rotation with this stem 4 by cooperation of its Breguet toothing 5a with that of a sliding pinion (not shown) when the winding stem is in the winding position.
  • the mobile 6 is called “mobile crown” because it meshes on the one hand with the winding pinion 5 and on the other hand with the ratchet 7.
  • This mobile crown 6 comprises an axis (not shown), a first crown wheel 61, a second crown wheel 62, a crown star wheel 63 integral with the second crown wheel 62 - the wheels 61, 62 and the star wheel 63 typically being mounted free to rotate on said axis - as well as two jumpers 641, 642 carried by the first crown wheel 61 and engaged in the toothing of the crown star 63.
  • the jumpers 641, 642 are typically part of a one-piece assembly 64 fixed to the first crown wheel 61, said assembly 64 comprising a rigid ring, fixed to the first crown wheel 61, said ring carrying two beaks which are connected to it by elastic arms. Each of said spouts is held against the star 63 by the elastic arm which connects it to the ring.
  • the one-piece assembly 64 could advantageously form a one-piece assembly with the first crown wheel 61. It could comprise a single jumper jumper or more than two jumpers, for example three or four. In the case where the assembly 64 comprises more than two jumpers, these would advantageously be uniformly distributed around the star 63.
  • each of the jumpers 641, 642 The stiffness of the elastic arms of each of the jumpers 641, 642 is chosen so that they make it possible to secure the first crown wheel 61 and the second crown wheel 62 as long as the torque required to wind the mainspring of the barrel does not exceed a certain threshold value, this value corresponding to the optimum level of winding of the barrel spring as defined previously.
  • the system comprising the jumpers 641, 642 and the star 63 of crown mobile 6 transmits the torque received by first crown wheel 61 to second crown wheel 62.
  • Jumpers 641 and 642 remain engaged in the toothing of star wheel 63, as illustrated in figure 1 .
  • the crown mobile 6 operates like a conventional single crown wheel.
  • the pivoting of the first crown wheel 61 by actuation of the winding stem 4 does not cause any movement of the second crown wheel 62.
  • the force of the elastic arms of the jumpers 641, 642 does not allow them to remain in the toothing of the star 63.
  • the jumpers 641, 642 will therefore rise and let the teeth of star 63, as shown in picture 2 .
  • the crown mobile 6 is therefore a clutch mobile. It makes it possible to disengage between the first crown wheel 61 and the second crown wheel 62 when the mainspring is sufficiently armed.
  • the mechanism 1 avoids any overvoltage and thus makes it possible to avoid the risk of breakage of the barrel even if the user continues to turn the winding stem while the barrel spring is fully wound.
  • This mechanism 1 also has the advantage of not creating any blockage which could cause breakage. Finally, it allows the user to feel the click when it occurs and thus to know when the barrel is sufficiently cocked. This allows him to avoid unnecessarily activating the winding crown.
  • a watch mechanism 10 also comprises a barrel and a winding mechanism for this barrel.
  • the barrel of mechanism 10 is identical to the barrel of mechanism 1 previously described.
  • the pins A', 12, 13 and 121 correspond respectively to the pins A, 2, 3 and 21 of the cylinder previously described.
  • the winding mechanism of mechanism 10 is also similar to that according to the first embodiment. It comprises a winding stem 14 and a winding pinion 15 equivalent to those 4 and 5 described in the first embodiment.
  • the mechanism 10 differs from the mechanism 1 in that it comprises a simple crown wheel 16 and in that its release wheel set includes the ratchet 17 unlike that of the first embodiment of the invention.
  • the ratchet 17 is not integral in rotation with the shaft 13 of the barrel. It is part of a clutch wheel comprising the ratchet 17, a star 18 coaxial with the ratchet 17 mounted on the shaft 13 and made integral in rotation with the shaft 13 by a square, and two jumpers 91 and 92 carried by the ratchet 17 and engaged in the toothing of star 18.
  • the jumpers 91 and 92 are identical to those 641, 642 of the first embodiment of the invention, they cooperate with the star 18 in the same way that the jumpers 641, 642 cooperate with the star 63.
  • the jumpers 91 and 92 are typically part of a one-piece assembly and advantageously form a one-piece assembly with the wheel which carries them, in this case the ratchet 17.
  • the stiffness of the elastic arms of each of the jumpers 91, 92 is chosen so that they make it possible to secure the ratchet 17 and the star 18 as long as the torque necessary to arm the spring of the barrel does not exceed a certain threshold value, as defined previously.
  • This embodiment has an additional advantage over the first embodiment presented. Indeed, in this embodiment, a toothed wheel is eliminated compared to the first mode of embodiment described and the "star 18 - springs 91-92" system allowing the clutch to be released can be integrated into the plate of the ratchet 17 so that it does not increase its dimensions. It is therefore more compact.
  • the jumpers 641, 642 or 91, 92 of the release wheel set are two in number and form part of a one-piece assembly 64 or 9 mounted on a wheel 61 or 17.
  • said one-piece assembly 64; 9 could have come from material with the wheel 61; 17 on which it is fixed.
  • the one-piece assembly 64; 9 could be replaced by more traditional jumpers comprising an inclined plane subjected to the action of an independent spring. These jumpers would typically be attached to said wheel 61; 17.
  • the release wheel set could comprise a single jumper instead of the two illustrated or even more than two, for example three or four.
  • the release mobile comprises more than two jumpers, these are typically distributed uniformly around the star.
  • the winding stem is intended to be manually operable by the user from outside the case of a watch.
  • the clutch is located in the kinematic chain going from the winding pinion to the barrel arbor.
  • this kinematic chain consists, successively, of the first crown wheel 61, of the assembly 64 comprising the jumpers 641, 642, of the crown star 63, of the second crown wheel 62 and of the ratchet 7.
  • this kinematic chain consists, successively, of the crown wheel 16, of the ratchet 17, of the one-piece assembly 9 carrying the jumpers 91 and 92, and of the star 18.
  • the winding of the barrel spring is done by the inner turn of the barrel spring via the barrel arbor.
  • the clutch would have to be located in the kinematic chain going from the winding pinion to the barrel arbor.
  • the slats engaged in the spider of the release wheel set and held in abutment against this star via elastic arms are jumpers and can solidarize in rotation the wheel which carries them with the star whatever the relative direction of rotation of said wheels and star.
  • the clutch release wheel is therefore bidirectional even if, in practice, it will only operate in one direction corresponding to the direction leading to the winding of the mainspring.
  • a wolf-tooth gear typically enables the torque applied to the winding crown to be transmitted to the crown wheel only when the latter is pivoted in a predetermined direction leading to winding of the mainspring.
  • the replacement of said jumpers by pawls one-way operation is also entirely possible.

Abstract

L'invention concerne un mécanisme horloger (10) comprenant un mécanisme de remontoir et un barillet dans lequel la chaîne cinématique allant du pignon de remontoir (15) du mécanisme de remontoir à l'arbre (13) ou au tambour (12) du barillet comprend un mobile de débrayage (, ledit mobile de débrayage étant conçu de sorte qu'il est apte à débrayer lorsque le couple engendré par le ressort de barillet dépasse une certaine valeur.L'invention concerne également une pièce d'horlogerie comprenant un tel mécanisme.The invention relates to a watch mechanism (10) comprising a winding mechanism and a barrel in which the kinematic chain going from the winding pinion (15) of the winding mechanism to the shaft (13) or to the drum (12) of the barrel comprises a clutch wheel (, said clutch wheel being designed so that it is capable of disengaging when the torque generated by the barrel spring exceeds a certain value.The invention also relates to a timepiece comprising such a mechanism .

Description

La présente invention concerne un mécanisme horloger pour montre à remontage manuel comprenant un mécanisme de remontoir et un barillet, conçue pour éviter tout risque de surtension sur le ressort de barillet lors de son remontage.The present invention relates to a horological mechanism for a hand-wound watch comprising a winding mechanism and a barrel, designed to avoid any risk of excess tension on the barrel spring during its winding.

L'invention concerne également une pièce d'horlogerie comprenant un tel mécanisme.The invention also relates to a timepiece comprising such a mechanism.

Le barillet d'une montre est un assemblage généralement composé d'un tambour de barillet, d'un ressort de barillet, d'un arbre de barillet et d'un couvercle de barillet. Typiquement, l'arbre sert de pivotement au tambour. Le ressort de barillet est logé dans le tambour et fixé par sa spire intérieure à l'arbre de barillet et par sa spire extérieure au tambour de barillet. Le couvercle ferme quant à lui la boîte ; il pivote autour de l'arbre. Le remontage se fait typiquement par l'intermédiaire d'un rochet rendu solidaire en rotation de l'arbre de barillet via un carré.The barrel of a watch is an assembly generally made up of a barrel drum, a barrel spring, a barrel arbor and a barrel cover. Typically, the shaft serves as a pivot for the drum. The mainspring is housed in the drum and fixed by its inner coil to the barrel arbor and by its outer coil to the barrel drum. The lid closes the box; it pivots around the shaft. Winding is typically done by means of a ratchet made integral in rotation with the barrel arbor via a square.

La surtension du ressort de barillet correspond à un état d'armage trop important. Elle présente plusieurs inconvénients. Elle peut, entre autres, être à l'origine de rebat dans le balancier et donc affecter la chronométrie. Elle peut aussi conduire à la casse de la bride ou d'un autre élément comme la tige de remontoir ou une roue dans la chaine cinématique de remontage.The over-tensioning of the barrel spring corresponds to too great a state of winding. It has several drawbacks. It can, among other things, be the cause of rebate in the balance wheel and therefore affect chronometry. It can also lead to the breakage of the flange or of another element such as the winding stem or a wheel in the kinematic winding chain.

Dans les montres à remontage automatique, l'armage du ressort continue alors que celui-ci est parvenu à son maximum de tension dans le barillet. Ainsi, un accrochement rigide de la spire extérieure du ressort sur le tambour de barillet conduirait à une surtension du ressort de barillet et risquerait, entre autres, de détériorer la montre. Pour éviter la surtension, le ressort n'est pas accroché au barillet mais est fixé par son extrémité extérieure à une lame qui appuie contre les parois du tambour de barillet et occupe un peu plus d'un tour. Cette lame appelée bride glissante permet au ressort de s'armer normalement. Puis, lorsque le ressort de barillet atteint un certain niveau d'armage, la dernière spire du ressort de barillet glisse contre le tambour.In self-winding watches, the winding of the spring continues when it has reached its maximum tension in the barrel. Thus, a rigid attachment of the outer coil of the spring to the barrel drum would lead to an overtension of the barrel spring and would risk, among other things, damage the watch. To avoid over-tensioning, the mainspring is not hooked to the barrel but is fixed by its outer end to a blade which presses against the walls of the barrel drum and takes up a little more than one turn. This blade, called a sliding flange, allows the spring to wind normally. Then, when the mainspring reaches a certain level of winding, the last coil of the mainspring slides against the drum.

Une surtension pouvant aller jusqu'à provoquer la casse du ressort de barillet ou d'un organe du dispositif de remontoir peut également se produire dans une montre à remontage manuel, notamment si l'utilisateur force sur la tige de remontoir. Cependant, le recours à une bride glissante présente l'inconvénient d'occuper un tour de barillet et donc de diminuer la réserve de marche de la montre par rapport à une montre comprenant un barillet de taille équivalente mais ne comprenant pas de bride glissante. De plus, l'utilisation d'un barillet à bride glissante ne permet pas à l'utilisateur qui remonte manuellement sa montre de ressentir si le ressort est complètement armé. Ainsi, un tel barillet n'est pas adapté dans une montre à remontage manuel. En outre, l'utilisation d'une bride glissante peut conduire à l'accumulation de débris à l'intérieur du barillet et engendrer ensuite des dysfonctionnements.An overvoltage which may go so far as to cause the breakage of the barrel spring or of a component of the winding device may also occur in a manually wound watch, in particular if the user forces the winding stem. However, the use of a sliding strap has the disadvantage of occupying one turn of the barrel and therefore of reducing the power reserve of the watch compared to a watch comprising a barrel of equivalent size but not comprising a sliding strap. Furthermore, the use of a barrel with a sliding flange does not allow the user who manually winds his watch to feel whether the spring is fully wound. Thus, such a barrel is not suitable in a hand-wound watch. In addition, the use of a slipping flange can lead to the accumulation of debris inside the barrel and then cause malfunctions.

Un objectif de la présente invention consiste à proposer un mécanisme horloger comprenant un ressort de barillet et un mécanisme de remontoir actionnable manuellement, ledit mécanisme horloger évitant toute surtension, en particulier tout risque de casse du ressort de barillet, lors de son armage, et palliant au moins en partie les inconvénients précités. Avantageusement, le mécanisme selon l'invention permettra également de donner une information sensorielle, typiquement tactile ou acoustique, permettant à l'utilisateur de la montre de savoir que celle-ci a atteint soin niveau de remontage optimal.An object of the present invention is to provide a watch mechanism comprising a barrel spring and a manually operable winding mechanism, said watch mechanism avoiding any overvoltage, in particular any risk of breakage of the barrel spring, during its winding, and alleviating at least in part the aforementioned drawbacks. Advantageously, the mechanism according to the invention will also make it possible to give sensory information, typically tactile or acoustic, allowing the user of the watch to know that the latter has reached an optimal level of winding.

A cet effet, la présente invention concerne un mécanisme horloger comprenant un mécanisme de remontoir et un barillet.To this end, the present invention relates to a timepiece mechanism comprising a winding mechanism and a barrel.

Le mécanisme horloger selon l'invention est conçu de sorte que la chaîne cinématique allant du pignon de remontoir à l'arbre ou au tambour de barillet comprend un mobile de débrayage, ledit mobile étant conçu pour débrayer lorsque le couple délivré par le ressort de barillet dépasse une valeur seuil prédéterminée. Cette valeur seuil correspond à un armage dit optimal du ressort de barillet, c'est-à-dire un armage lui permettant de délivrer le plus grand couple possible sans pour autant subir de surtension.The watch mechanism according to the invention is designed so that the kinematic chain going from the winding pinion to the arbor or to the barrel drum comprises a release wheel, said wheel being designed to disengage when the torque delivered by the barrel spring exceeds a predetermined threshold value. This threshold value corresponds to a so-called optimal winding of the barrel spring, that is to say a winding enabling it to deliver the greatest possible torque without however being subjected to an overvoltage.

Selon un premier mode de réalisation de l'invention, le mobile de débrayage comprend une première roue, une deuxième roue et une étoile coaxiales ainsi qu'un cliquet ou sautoir fixé sur l'une desdites deux roues et positionnant cette dernière par rapport à l'étoile, l'étoile étant solidaire de l'autre desdites deux roues. Lesdites première et deuxièmes roues sont typiquement des roues dentées.According to a first embodiment of the invention, the release wheel assembly comprises a first wheel, a second wheel and a coaxial spider as well as a pawl or jumper fixed to one of said two wheels and positioning the latter relative to the star, the star being integral with the other of said two wheels. Said first and second wheels are typically toothed wheels.

Dans un second mode de réalisation de l'invention, le mobile de débrayage comprend une première roue, typiquement dentée, et une étoile coaxiales ainsi qu'au moins un cliquet ou sautoir fixé sur ladite première roue et positionnant cette dernière par rapport à l'étoile. De préférence, la première roue et l'étoile sont coaxiales de l'arbre de barillet, la première roue est montée libre en rotation autour de l'arbre et l'étoile est solidaire en rotation de l'arbre.In a second embodiment of the invention, the release wheel assembly comprises a first wheel, typically toothed, and a coaxial spider as well as at least one pawl or jumper fixed to said first wheel and positioning the latter relative to the star. Preferably, the first wheel and the star are coaxial with the barrel arbor, the first wheel is mounted free to rotate around the arbor and the star is integral in rotation with the arbor.

De préférence, la roue qui porte ledit au moins un sautoir et ledit cliquet ou sautoir forment un ensemble monobloc. En d'autres termes, ledit au moins un cliquet ou sautoir est venu de matière avec la roue qui le porte.Preferably, the wheel which carries said at least one jumper and said pawl or jumper form a one-piece assembly. In other words, said at least one pawl or jumper is integral with the wheel that carries it.

L'invention concerne également une pièce d'horlogerie telle qu'une montre-bracelet, une montre de poche, une pendule ou une pendulette comprenant un tel mécanisme horloger.The invention also relates to a timepiece such as a wristwatch, a pocket watch, a clock or a clock comprising such a clockwork mechanism.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée suivante faite en référence aux dessins annexés dans lesquels :

  • les figures 1 et 2 représentent en vue de dessus et en partie par transparence un mécanisme horloger selon un premier mode de réalisation de l'invention dans deux états successifs au cours du remontage du barillet.
  • la figure 3 représente en vue de côté, le mécanisme représenté aux figures 1 et 2.
  • les figures 4 et 5 représentent en vue de dessus et en partie par transparence un mécanisme horloger selon un second mode de réalisation de l'invention dans deux états successifs au cours du remontage du barillet.
  • la figure 6 représente en vue de côté, le mécanisme représenté aux figures 4 et 5.
Other characteristics and advantages of the present invention will appear on reading the following detailed description given with reference to the appended drawings in which:
  • THE figures 1 and 2 represent in top view and partly by transparency a watch mechanism according to a first embodiment of the invention in two successive states during the winding of the barrel.
  • there figure 3 represents in side view, the mechanism represented in figures 1 and 2 .
  • THE figures 4 and 5 represent in top view and partly by transparency a watch mechanism according to a second embodiment of the invention in two successive states during the winding of the barrel.
  • there figure 6 represents in side view, the mechanism represented in figures 4 and 5 .

En référence aux figures 1 à 3, un mécanisme horloger 1 selon un premier mode de réalisation de l'invention comprend un barillet et un mécanisme de remontoir de ce barillet.With reference to figures 1 to 3 , a watch mechanism 1 according to a first embodiment of the invention comprises a barrel and a winding mechanism for this barrel.

Le barillet du mécanisme 1 comprend de façon traditionnelle un tambour 2 de barillet comprenant une denture 21, un arbre 3 de barillet mobile en rotation autour d'un axe A dans le tambour 2 et un ressort de barillet (non visible dans les figures) logé dans ce tambour 2. La spire intérieure de ce ressort est typiquement fixée sur un crochet porté par une bonde de l'arbre 3 et sa spire extérieure est fixée sur la surface intérieure du tambour pour assurer l'entrainement du tambour 2.The barrel of the mechanism 1 traditionally comprises a barrel drum 2 comprising a toothing 21, a barrel arbor 3 rotatable about an axis A in the drum 2 and a barrel spring (not visible in the figures) housed in this drum 2. The inner turn of this spring is typically fixed on a hook carried by a bung of the shaft 3 and its outer turn is fixed on the inner surface of the drum to ensure the drive of the drum 2.

Le mécanisme de remontoir du mécanisme 1 comprend quant à lui une tige de remontoir 4, un pignon de remontoir 5, un mobile de couronne 6, un rochet 7 monté sur l'arbre 3 et rendu solidaire en rotation de ce dernier par un carré. Le pignon de remontoir 5 est monté, de façon traditionnelle, libre en rotation sur la tige de remontoir 4. Il est rendu solidaire en rotation de cette tige 4 par coopération de sa denture Breguet 5a avec celle d'un pignon coulant (non représenté) lorsque la tige de remontoir est en position de remontage.The winding mechanism of mechanism 1 comprises a winding stem 4, a winding pinion 5, a crown mobile 6, a ratchet 7 mounted on the shaft 3 and secured in rotation to the latter by a square. The winding pinion 5 is mounted, in the traditional way, free to rotate on the winding stem 4. It is made integral in rotation with this stem 4 by cooperation of its Breguet toothing 5a with that of a sliding pinion (not shown) when the winding stem is in the winding position.

Le mobile 6 est appelé « mobile de couronne » car il engrène d'une part avec le pignon de remontoir 5 et d'autre part avec le rochet 7. Ce mobile de couronne 6 comprend un axe (non illustré), une première roue de couronne 61, une deuxième roue de couronne 62, une étoile de couronne 63 solidaire de la deuxième roue de couronne 62 - les roues 61, 62 et l'étoile 63 étant typiquement montées libres en rotation sur ledit axe - ainsi que deux sautoirs 641, 642 portés par la première roue de couronne 61 et engagés dans la denture de l'étoile de couronne 63.The mobile 6 is called "mobile crown" because it meshes on the one hand with the winding pinion 5 and on the other hand with the ratchet 7. This mobile crown 6 comprises an axis (not shown), a first crown wheel 61, a second crown wheel 62, a crown star wheel 63 integral with the second crown wheel 62 - the wheels 61, 62 and the star wheel 63 typically being mounted free to rotate on said axis - as well as two jumpers 641, 642 carried by the first crown wheel 61 and engaged in the toothing of the crown star 63.

Les sautoirs 641, 642 font typiquement partie d'un ensemble 64 monobloc fixé sur la première roue de couronne 61, ledit ensemble 64 comprenant un anneau rigide, fixé sur la première roue de couronne 61, ledit anneau portant deux becs qui lui sont reliés par des bras élastiques. Chacun desdits becs est maintenu en appui contre l'étoile 63 par le bras élastique qui le relie à l'anneau.The jumpers 641, 642 are typically part of a one-piece assembly 64 fixed to the first crown wheel 61, said assembly 64 comprising a rigid ring, fixed to the first crown wheel 61, said ring carrying two beaks which are connected to it by elastic arms. Each of said spouts is held against the star 63 by the elastic arm which connects it to the ring.

En variante, l'ensemble monobloc 64 pourrait avantageusement former un ensemble monobloc avec la première roue de couronne 61. Il pourrait comprendre un seul sautoir ou plus de deux sautoirs, par exemple trois ou quatre. Dans le cas où l'ensemble 64 comprendrait plus de deux sautoirs, ceux-ci seraient avantageusement uniformément répartis autour de l'étoile 63.As a variant, the one-piece assembly 64 could advantageously form a one-piece assembly with the first crown wheel 61. It could comprise a single jumper jumper or more than two jumpers, for example three or four. In the case where the assembly 64 comprises more than two jumpers, these would advantageously be uniformly distributed around the star 63.

La raideur des bras élastiques de chacun des sautoirs 641, 642 est choisie de sorte qu'ils permettent de solidariser la première roue de couronne 61 et la deuxième roue de couronne 62 tant que le couple nécessaire pour armer le ressort du barillet ne dépasse pas une certaine valeur seuil, cette valeur correspondant au niveau d'armage optimal du ressort de barillet tel que défini précédemment.The stiffness of the elastic arms of each of the jumpers 641, 642 is chosen so that they make it possible to secure the first crown wheel 61 and the second crown wheel 62 as long as the torque required to wind the mainspring of the barrel does not exceed a certain threshold value, this value corresponding to the optimum level of winding of the barrel spring as defined previously.

En pratique, lorsque la tige de remontoir 4 est pivotée alors qu'elle est en position axiale de remontage, le pignon de remontoir 5 est entraîné en rotation par le pignon coulant et entraîne à son tour la première roue de couronne 61.In practice, when the winding stem 4 is pivoted while it is in the axial winding position, the winding pinion 5 is driven in rotation by the sliding pinion and in turn drives the first crown wheel 61.

Tant que le ressort de barillet n'est pas trop armé, c'est-à-dire tant que le couple de rappel qu'il engendre est inférieur à la valeur seuil prédéfinie, le système comprenant les sautoirs 641, 642 et l'étoile 63 du mobile de couronne 6 transmet le couple reçu par la première roue de couronne 61 à la deuxième roue de couronne 62. Les sautoirs 641 et 642 restent engagés dans la denture de l'étoile 63, comme illustré à la figure 1. Le mobile de couronne 6 fonctionne comme une roue de couronne unique classique.As long as the barrel spring is not over-reinforced, that is to say as long as the return torque that it generates is less than the predefined threshold value, the system comprising the jumpers 641, 642 and the star 63 of crown mobile 6 transmits the torque received by first crown wheel 61 to second crown wheel 62. Jumpers 641 and 642 remain engaged in the toothing of star wheel 63, as illustrated in figure 1 . The crown mobile 6 operates like a conventional single crown wheel.

Par contre, une fois que le ressort de barillet est armé d'une valeur supérieure à ladite valeur seuil, le pivotement de la première roue de couronne 61 par actionnement de la tige de remontoir 4 ne provoque aucun mouvement de la deuxième roue de couronne 62. En effet, la force des bras élastiques des sautoirs 641, 642 ne leur permet pas de rester dans la denture de l'étoile 63. Les sautoirs 641, 642 vont donc se lever et laisser passer les dents de l'étoile 63, comme illustré à la figure 2. Le mobile de couronne 6 est donc un mobile de débrayage. Il permet de débrayer entre la première roue de couronne 61 et la deuxième roue de couronne 62 lorsque le ressort de barillet est suffisamment armé.On the other hand, once the barrel spring is armed with a value greater than said threshold value, the pivoting of the first crown wheel 61 by actuation of the winding stem 4 does not cause any movement of the second crown wheel 62. Indeed, the force of the elastic arms of the jumpers 641, 642 does not allow them to remain in the toothing of the star 63. The jumpers 641, 642 will therefore rise and let the teeth of star 63, as shown in picture 2 . The crown mobile 6 is therefore a clutch mobile. It makes it possible to disengage between the first crown wheel 61 and the second crown wheel 62 when the mainspring is sufficiently armed.

En variante, il est possible de fixer l'étoile de couronne 63 sur la première roue de couronne 61 et l'ensemble monobloc 64 portant les sautoirs 641, 642 sur la deuxième roue de couronne 62.As a variant, it is possible to fix the crown star 63 on the first crown wheel 61 and the one-piece assembly 64 carrying the jumpers 641, 642 on the second crown wheel 62.

Le mécanisme 1 selon le premier mode de réalisation de l'invention évite toute surtension et permet ainsi d'éviter le risque de casse du barillet même si l'utilisateur continue de tourner la tige de remontoir alors que le ressort de barillet est complètement armé. Ce mécanisme 1 présente en outre l'avantage de ne créer aucun blocage qui pourrait être à l'origine d'une casse. Enfin, il permet à l'utilisateur de ressentir le décliquetage lorsqu'il se produit et ainsi de savoir lorsque le barillet est suffisamment armé. Cela lui permet d'éviter d'actionner inutilement la couronne de remontoir.The mechanism 1 according to the first embodiment of the invention avoids any overvoltage and thus makes it possible to avoid the risk of breakage of the barrel even if the user continues to turn the winding stem while the barrel spring is fully wound. This mechanism 1 also has the advantage of not creating any blockage which could cause breakage. Finally, it allows the user to feel the click when it occurs and thus to know when the barrel is sufficiently cocked. This allows him to avoid unnecessarily activating the winding crown.

En référence aux figures 4, 5 et 6, un mécanisme horloger 10 selon un deuxième mode de réalisation de l'invention comprend également un barillet et un mécanisme de remontoir de ce barillet.With reference to figures 4, 5 and 6 , a watch mechanism 10 according to a second embodiment of the invention also comprises a barrel and a winding mechanism for this barrel.

Le barillet du mécanisme 10 est identique au barillet du mécanisme 1 précédemment décrit. Les repères A', 12, 13 et 121 correspondent respectivement aux repères A, 2, 3 et 21 du barillet précédemment décrit.The barrel of mechanism 10 is identical to the barrel of mechanism 1 previously described. The pins A', 12, 13 and 121 correspond respectively to the pins A, 2, 3 and 21 of the cylinder previously described.

Le mécanisme de remontoir du mécanisme 10 est également similaire à celui selon le premier mode de réalisation. Il comprend une tige de remontoir 14 et un pignon de remontoir 15 équivalents à ceux 4 et 5 décrits dans le premier mode de réalisation.The winding mechanism of mechanism 10 is also similar to that according to the first embodiment. It comprises a winding stem 14 and a winding pinion 15 equivalent to those 4 and 5 described in the first embodiment.

Le mécanisme 10 diffère du mécanisme 1 en ce qu'il comprend une simple roue de couronne 16 et en ce que son mobile de débrayage inclut le rochet 17 à la différence de celui du premier mode de réalisation de l'invention.The mechanism 10 differs from the mechanism 1 in that it comprises a simple crown wheel 16 and in that its release wheel set includes the ratchet 17 unlike that of the first embodiment of the invention.

Contrairement au rochet 7, le rochet 17 n'est pas solidaire en rotation de l'arbre 13 de barillet. Il fait partie d'un mobile de débrayage comprenant le rochet 17, une étoile 18 coaxiale du rochet 17 montée sur l'arbre 13 et rendue solidaire en rotation de l'arbre 13 par un carré, et deux sautoirs 91 et 92 portés par le rochet 17 et engagés dans la denture de l'étoile 18.Unlike the ratchet 7, the ratchet 17 is not integral in rotation with the shaft 13 of the barrel. It is part of a clutch wheel comprising the ratchet 17, a star 18 coaxial with the ratchet 17 mounted on the shaft 13 and made integral in rotation with the shaft 13 by a square, and two jumpers 91 and 92 carried by the ratchet 17 and engaged in the toothing of star 18.

Les sautoirs 91 et 92 sont identiques à ceux 641, 642 du premier mode de réalisation de l'invention, ils coopèrent avec l'étoile 18 de la même façon que les sautoirs 641, 642 coopèrent avec l'étoile 63. Ainsi, les sautoirs 91 et 92 font typiquement partie d'un ensemble monobloc et forment avantageusement un ensemble monobloc avec la roue qui les porte, en l'occurrence le rochet 17.The jumpers 91 and 92 are identical to those 641, 642 of the first embodiment of the invention, they cooperate with the star 18 in the same way that the jumpers 641, 642 cooperate with the star 63. Thus, the jumpers 91 and 92 are typically part of a one-piece assembly and advantageously form a one-piece assembly with the wheel which carries them, in this case the ratchet 17.

Comme pour le premier mode de réalisation de l'invention, la raideur des bras élastiques de chacun des sautoirs 91, 92 est choisie de sorte qu'ils permettent de solidariser le rochet 17 et l'étoile 18 tant que le couple nécessaire pour armer le ressort du barillet ne dépasse pas une certaine valeur seuil, telle que définie précédemment.As for the first embodiment of the invention, the stiffness of the elastic arms of each of the jumpers 91, 92 is chosen so that they make it possible to secure the ratchet 17 and the star 18 as long as the torque necessary to arm the spring of the barrel does not exceed a certain threshold value, as defined previously.

Ce mode de réalisation présente un avantage supplémentaire par rapport au premier mode de réalisation présenté. En effet, dans ce mode de réalisation, on élimine une roue dentée par rapport au premier mode de réalisation décrit et le système « étoile 18 - ressorts 91-92 » permettant le débrayage peut être intégré dans la planche du rochet 17 de sorte qu'il n'en augmente pas les dimensions. Il est donc plus compact.This embodiment has an additional advantage over the first embodiment presented. Indeed, in this embodiment, a toothed wheel is eliminated compared to the first mode of embodiment described and the "star 18 - springs 91-92" system allowing the clutch to be released can be integrated into the plate of the ratchet 17 so that it does not increase its dimensions. It is therefore more compact.

Dans chacun des deux modes de réalisation illustré, les sautoirs 641, 642 ou 91, 92 du mobile de débrayage sont au nombre de deux et font partie d'un ensemble monobloc 64 ou 9 monté sur une roue 61 ou 17.In each of the two illustrated embodiments, the jumpers 641, 642 or 91, 92 of the release wheel set are two in number and form part of a one-piece assembly 64 or 9 mounted on a wheel 61 or 17.

Alternativement, ledit ensemble monobloc 64 ; 9 pourrait être venu de matière avec la roue 61 ; 17 sur laquelle il est fixé.Alternatively, said one-piece assembly 64; 9 could have come from material with the wheel 61; 17 on which it is fixed.

Dans d'autres variantes, l'ensemble monobloc 64 ; 9 pourrait être remplacé par des sautoirs plus traditionnels comprenant un plan incliné soumis à l'action d'un ressort indépendant. Ces sautoirs seraient typiquement fixés sur ladite roue 61 ; 17.In other variants, the one-piece assembly 64; 9 could be replaced by more traditional jumpers comprising an inclined plane subjected to the action of an independent spring. These jumpers would typically be attached to said wheel 61; 17.

Il serait également possible que le mobile de débrayage comprenne un unique sautoir au lieu des deux illustrés ou bien plus de deux, par exemple trois ou quatre. Dans le cas où le mobile de débrayage comprend plus de deux sautoirs, ceux-ci sont typiquement répartis uniformément autour de l'étoile.It would also be possible for the release wheel set to comprise a single jumper instead of the two illustrated or even more than two, for example three or four. In the case where the release mobile comprises more than two jumpers, these are typically distributed uniformly around the star.

Quel que soit le mode de réalisation, la tige de remontoir est destinée à être actionnable manuellement par l'utilisateur depuis l'extérieur de la boîte d'une montre.Whatever the embodiment, the winding stem is intended to be manually operable by the user from outside the case of a watch.

La description qui précède s'attache à décrire un mode de réalisation particulier à titre d'illustration non limitative, et l'invention n'est pas limitée à la mise en œuvre de certaines caractéristiques particulières qui viennent d'être décrites, comme par exemple la structure du mécanisme d'entraînement du pignon de remontoir 5, 15 ou les formes représentées pour les différents constituants.The foregoing description sets out to describe a particular embodiment by way of non-limiting illustration, and the invention is not limited to the implementation of certain particular characteristics which have just been described, such as for example the structure of the winding pinion drive mechanism 5, 15 or the shapes shown for the various components.

Dans les deux modes de réalisation décrits, le débrayage est situé dans la chaine cinématique allant du pignon de remontoir à l'arbre de barillet. Dans le mécanisme horloger 1, cette chaîne cinématique est constituée, successivement, de la première roue de couronne 61, de l'ensemble 64 comprenant les sautoirs 641, 642, de l'étoile de couronne 63, de la deuxième roue de couronne 62 et du rochet 7. Dans le mécanisme horloger 10, cette chaîne cinématique est constituée, successivement, de la roue de couronne 16, du rochet 17, de l'ensemble monobloc 9 portant les sautoirs 91 et 92, et de l'étoile 18.In the two embodiments described, the clutch is located in the kinematic chain going from the winding pinion to the barrel arbor. In the watch mechanism 1, this kinematic chain consists, successively, of the first crown wheel 61, of the assembly 64 comprising the jumpers 641, 642, of the crown star 63, of the second crown wheel 62 and of the ratchet 7. In the watch mechanism 10, this kinematic chain consists, successively, of the crown wheel 16, of the ratchet 17, of the one-piece assembly 9 carrying the jumpers 91 and 92, and of the star 18.

Dans les deux modes de réalisation décrits, l'armage du ressort de barillet se fait par la spire intérieure du ressort de barillet via l'arbre de barillet. En variante, on pourrait imaginer remonter le ressort de barillet par le tambour de barillet auquel cas le débrayage devrait être situé dans la chaîne cinématique allant du pignon de remontoir à l'arbre de barillet.In the two embodiments described, the winding of the barrel spring is done by the inner turn of the barrel spring via the barrel arbor. As a variant, one could imagine winding up the barrel spring by the barrel drum, in which case the clutch would have to be located in the kinematic chain going from the winding pinion to the barrel arbor.

Dans les deux modes de réalisation décrits, les becs engagés dans l'étoile du mobile de débrayage et maintenus en appui contre cette étoile via des bras élastiques sont des sautoirs et peuvent solidariser en rotation la roue qui les porte de l'étoile quel que soit le sens de rotation relatif desdites roues et étoile. Le mobile de débrayage est donc bidirectionnel même si, en pratique, il ne fonctionnera que dans un sens correspondant au sens conduisant à l'armage du ressort de barillet. Un engrenage à dents de loups permet typiquement de ne transmettre le couple appliqué à la couronne de remontoir à la roue de couronne que lorsque celle-ci est pivotée dans un sens prédéterminé conduisant à l'armage du ressort de barillet. Le remplacement desdits sautoirs par des cliquets (fonctionnement unidirectionnel) est également tout à fait envisageable.In the two embodiments described, the slats engaged in the spider of the release wheel set and held in abutment against this star via elastic arms are jumpers and can solidarize in rotation the wheel which carries them with the star whatever the relative direction of rotation of said wheels and star. The clutch release wheel is therefore bidirectional even if, in practice, it will only operate in one direction corresponding to the direction leading to the winding of the mainspring. A wolf-tooth gear typically enables the torque applied to the winding crown to be transmitted to the crown wheel only when the latter is pivoted in a predetermined direction leading to winding of the mainspring. The replacement of said jumpers by pawls (one-way operation) is also entirely possible.

Claims (6)

Mécanisme horloger (1 ; 10) comprenant un mécanisme de remontoir et un barillet caractérisé en ce que la chaîne cinématique allant du pignon de remontoir (5 ; 15) du mécanisme de remontoir à l'arbre (3 ; 13) ou au tambour (2 ; 12) du barillet comprend un mobile de débrayage, ledit mobile de débrayage étant conçu pour débrayer lorsque le couple engendré par le ressort de barillet dépasse une certaine valeur.Watchmaker's mechanism (1; 10) comprising a winding mechanism and a barrel characterized in that the kinematic chain going from the winding pinion (5; 15) of the winding mechanism to the shaft (3; 13) or to the drum (2 12) of the barrel comprises a release wheel, said release wheel being designed to disengage when the torque generated by the mainspring exceeds a certain value. Mécanisme horloger selon la revendication 1, caractérisé en ce que ledit mobile de débrayage comprend une première roue (61 ; 17) et une étoile coaxiales (63 ; 18) ainsi qu'au moins un cliquet ou sautoir (641, 642; 91, 92) fixé sur ladite première roue (61, 17) et positionnant cette dernière par rapport à l'étoile (63 ; 18).Clockwork mechanism according to Claim 1, characterized in that the said release wheel assembly comprises a first wheel (61; 17) and a coaxial star wheel (63; 18) as well as at least one pawl or jumper (641, 642; 91, 92 ) fixed on said first wheel (61, 17) and positioning the latter with respect to the star wheel (63; 18). Mécanisme horloger selon la revendication 2, caractérisé en ce que la première roue (17) et l'étoile (18) sont coaxiales de l'arbre (13) de barillet, en ce que ladite première roue (17) est montée libre en rotation autour de l'arbre (13) et en ce que l'étoile (18) est solidaire en rotation de l'arbre (13).Clockwork mechanism according to Claim 2, characterized in that the first wheel (17) and the spider (18) are coaxial with the barrel arbor (13), in that the said first wheel (17) is mounted free in rotation around the shaft (13) and in that the star (18) is integral in rotation with the shaft (13). Mécanisme horloger selon la revendication 1, caractérisé en ce que ledit mobile de débrayage (6) comprend une première roue (61), une deuxième roue (62) et une étoile (63) coaxiales ainsi qu'un cliquet ou sautoir (641, 642) fixé sur l'une (61) desdites deux roues (61, 62) et positionnant cette dernière par rapport à l'étoile (63), l'étoile (63) étant solidaire de l'autre (62) desdites deux roues (61, 62).Clockwork mechanism according to Claim 1, characterized in that the said release wheel set (6) comprises a first wheel (61), a second wheel (62) and a coaxial spider (63) as well as a pawl or jumper (641, 642) fixed to one (61) of said two wheels (61, 62) and positioning the latter relative to the star (63), the star (63) being integral with the other (62 ) of said two wheels (61, 62). Mécanisme horloger selon l'une des revendications 2 à 4, caractérisé en ce que la roue qui porte ledit au moins un sautoir ou cliquet forme avec ce dernier un ensemble monobloc.Clockwork mechanism according to one of Claims 2 to 4, characterized in that the wheel which carries the said at least one jumper or pawl forms with the latter a one-piece assembly. Pièce d'horlogerie comprenant un mécanisme horloger selon l'une quelconque des revendications 1 à 5.Timepiece comprising a timepiece mechanism according to any one of Claims 1 to 5.
EP21200712.4A 2021-10-04 2021-10-04 Timepiece mechanism Pending EP4160320A1 (en)

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EP21200712.4A EP4160320A1 (en) 2021-10-04 2021-10-04 Timepiece mechanism

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EP21200712.4A EP4160320A1 (en) 2021-10-04 2021-10-04 Timepiece mechanism

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1845425A1 (en) * 2006-04-12 2007-10-17 Montres Breguet S.A. Chiming timepiece with a single barrel
CH697924B1 (en) * 2004-04-14 2009-03-31 Meco Sa Grenchen Crown for a timepiece with release device.
CH703483A2 (en) * 2010-07-30 2012-01-31 Seiko Instr Inc Winding wheel for use in watch movement, has projection detached from engaged part to rotate wheels, where force is applied to projection when manual winding torque is applied to limiting mechanism and adapted to separate projection
EP3705949A1 (en) * 2019-03-05 2020-09-09 ETA SA Manufacture Horlogère Suisse Torque limiter mechanism for a timepiece

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH697924B1 (en) * 2004-04-14 2009-03-31 Meco Sa Grenchen Crown for a timepiece with release device.
EP1845425A1 (en) * 2006-04-12 2007-10-17 Montres Breguet S.A. Chiming timepiece with a single barrel
CH703483A2 (en) * 2010-07-30 2012-01-31 Seiko Instr Inc Winding wheel for use in watch movement, has projection detached from engaged part to rotate wheels, where force is applied to projection when manual winding torque is applied to limiting mechanism and adapted to separate projection
EP3705949A1 (en) * 2019-03-05 2020-09-09 ETA SA Manufacture Horlogère Suisse Torque limiter mechanism for a timepiece

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