EP3396470A1 - Mechanical braking device for a clock wheel - Google Patents

Mechanical braking device for a clock wheel Download PDF

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Publication number
EP3396470A1
EP3396470A1 EP17167802.2A EP17167802A EP3396470A1 EP 3396470 A1 EP3396470 A1 EP 3396470A1 EP 17167802 A EP17167802 A EP 17167802A EP 3396470 A1 EP3396470 A1 EP 3396470A1
Authority
EP
European Patent Office
Prior art keywords
shaft
common axis
braking
clock mechanism
latch
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.)
Granted
Application number
EP17167802.2A
Other languages
German (de)
French (fr)
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EP3396470B1 (en
Inventor
Ivan Villar
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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.)
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Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP17167802.2A priority Critical patent/EP3396470B1/en
Priority to US15/935,618 priority patent/US10816933B2/en
Priority to JP2018059298A priority patent/JP6467541B2/en
Priority to CN201810367679.6A priority patent/CN108732904B/en
Publication of EP3396470A1 publication Critical patent/EP3396470A1/en
Application granted granted Critical
Publication of EP3396470B1 publication Critical patent/EP3396470B1/en
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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • G04B13/023—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft allowing rotational slipping when a threshold torque is exceeded
    • 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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • 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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • 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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • G04B13/022—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft with parts made of hard material, e.g. silicon, diamond, sapphire, quartz and the like

Definitions

  • the invention relates to a clockwork mechanism comprising at least one structure in which at least one shaft of a moving body is pivoted along an axis of rotation, said mechanism comprising at least one braking device for mechanical braking with a constant torque of a said tree.
  • the invention also relates to a watch movement comprising at least one such clock mechanism.
  • the invention also relates to a watch comprising at least one such movement and / or at least one such watch mechanism.
  • the invention relates to the field of watch mechanisms, in particular display mechanisms.
  • the angular clearance of the display mobiles results in an unpleasant visual effect for the user, called a bucking, as conventionally visible on a needle of a small seconds display with an unstretched wheel.
  • Some systems already exist such as magnetic brakes, flexible teeth or springs acting as brake. These are often springs chips (foils) or blades rubbing on the mobile, which have the disadvantage of inducing a large variation of friction force and thus a variable disturbance of walking.
  • the invention proposes to simply and economically reduce the angular clearance at the mobile display in an unstressed wheel.
  • the invention relates to a timepiece mechanism according to claim 1.
  • the invention further relates to a watch movement comprising at least one such clock mechanism.
  • the invention also relates to a watch comprising at least one such movement and / or at least one such watch mechanism.
  • the invention relates to a clockwork mechanism 100 comprising at least one structure 20 in which at least one shaft 30 of a mobile 40 is pivoted along an axis of rotation D.
  • This mechanism 100 comprises at least one braking device 10 for the constant torque mechanical braking of a shaft 30.
  • this braking device 10 comprises a braking component 1, which is removable relative to the structure 20, and which comprises, for its attachment to the structure, a massive serge 2, which carries a plurality of elements elastic 3.
  • These elastic elements 3 are preferably identical and regularly distributed around a common axis AC around which these elastic elements 3 each comprise a contact zone 4.
  • the contact zones 4 together define an opening 5, which is arranged to cooperate by driving. and elastic clamping with a shaft 30, so as to make the common axis AC coincide with the axis of rotation D of the shaft 30, and to apply to the shaft 30 a substantially constant tangential braking force.
  • the value of the clamping on the shaft depends of course on the application. For current horological applications this clamping can be achieved between a low clamping, of the order of 5 micrometers to the radius, and a strong clamping, of the order of 10 micrometers to the radius.
  • these elastic elements 3 can also, each, be a combination of elastic elements, not necessarily identical, nor necessarily regularly distributed around the common axis AC, but it is necessary that the resultant forces support that they exercise on a shaft 30 is zero, and that the distribution of torque they exert on this shaft 30 is regular.
  • the braking device 10 further comprises a positioning lock 6.
  • This lock 6 is arranged to be fixed on an implantation 26 that includes the structure 20, by trapping the braking component 1 so as to allow it an axial play limited to a bounded axial value, in the direction of the common axis AC, and / or to allow it an angular clearance limited to a bounded angular value, in a plane perpendicular to the common axis AC.
  • the braking component 1 is no longer lodged in the structure 20, but positioned by this latch 6, which does not block the braking component 1.
  • the latch 6 leaves a radial and axial degree of freedom brake component 1, so that it self-center and thus compensates for geometric variations.
  • the braking component 1 comprises, in a plane perpendicular to the common axis AC, a fork 7.
  • This fork 7 is arranged to surround a bearing surface 9 of the lock 6 with a clearance corresponding to the bounded angular value.
  • An upper face 71 of this fork 7 is arranged to cooperate in abutment abutment with at least one lower face 81, which comprises a collar 8 of the lock 6, to limit the axial stroke of the brake component 1.
  • this flange 8 comprises, in a first direction, a narrow portion of width LE less than the opening of the fork 7, to allow the insertion of the brake component 1 on the shaft 30 near the lock 7 fixed in a first angular position of insertion, on the structure 20.
  • the flange 8 comprises, in a second direction, preferably but not limitatively orthogonal to the first direction, a wide portion, which is of greater width LL than the opening LO of the fork 7. This wide portion carries the at least one lower face 81 which axially immobilizes the fork 7 in a second angular position for locking the lock 6.
  • the lock 6 can be simply driven into the implantation 26 of the structure 20, in other variants it can be mounted screwed, or with a bayonet connection, or other.
  • the axial clearance, such as the radial clearance is preferably, and not exclusively, between 10 and 30 microns, more particularly between 15 and 25 microns.
  • the serge 2 of the braking component 1 comprises, in a plane perpendicular to the common axis AC, hollow recesses 12, diametrically opposite two by two with respect to the common axis AC, and which are provided for the handling of the braking component 1 by robotic manipulator clamp, or for easy gripping by the tweezers of an operator.
  • the braking component 1 can simply be placed on a bearing surface of the structure 20, on which it is preferably held by the latch 6.
  • the serge 2 of the braking component 1 comprises, in a plane perpendicular to the common axis AC, radial stops 11 which are arranged to cooperate in radial abutment abutment with a recess 21 that includes the structure 20, to limit the radial stroke of the common axis AC relative to the axis of rotation D of the shaft 30. More particularly, these radial stops 11 are alternated with all or part of the clearances 12, when the brake component 1 comprises.
  • a mobile 40 is a small second display mobile, whose shaft is generally rolled and slightly conical.
  • the solution offered by the invention is well suited to this case, because of the moderate cost, the small size, the accuracy and the surface condition of the components in the presence, and the easy assembly because of the cone of the mobile tree.
  • the structure 20 comprises a plurality of implantations, which are arranged for the pivoting of different shafts 30 of different mobiles 40, around a single implantation 26, which is arranged to receive a latch 6 adapted to cooperate with a braking component 1 arranged on any one of the shafts 30.
  • the system can manage different distances of small seconds, while using the same components.
  • the serge 2 of the braking component 1 comprises a peripheral bearing which is arranged for, in a plane perpendicular to the common axis AC, to cooperate with clamping with a recess 21 which the structure 20 comprises.
  • the braking component 1 is monobloc and made of micro-machinable material, such as silicon, DLC, or other. Manufacture by a lithographic process or similar ensures high geometric accuracy, and a good surface and is mostly repetitive.
  • the invention also relates to a watch movement 200 comprising at least one such watch mechanism 100.
  • a particular application of the invention relates to its application to a chronograph mechanism.
  • the invention also relates to a watch 300 comprising at least one such movement 200 and / or at least one such watch mechanism 100.
  • the use of a braking component, as described above, similar to a washer with flexible arms rubbing on the pivot of a mobile, including a small seconds wheel, is particularly advantageous, because of the reproducibility of the behavior of the mobile, due to the manufacturing process of the braking component.
  • the invention also benefits from the good geometric accuracy and good surface condition induced by rolling. The friction force variation, unacceptable in the prior art, is reduced or even eliminated, which induces a lower variation of the gait.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Braking Arrangements (AREA)
  • Electromechanical Clocks (AREA)

Abstract

Mécanisme d'horlogerie (100) comportant une structure (20) dans laquelle est pivoté un arbre (30) d'un mobile (40) selon un axe de rotation (D), et comportant un dispositif de freinage (10) pour le freinage mécanique à couple constant de cet arbre (30), ce dispositif de freinage (10) comporte un composant de freinage (1) amovible par rapport à la structure (20) et qui comporte, pour sa fixation à la structure, une serge (2) massive, laquelle porte une pluralité d'éléments élastiques (3), répartis régulièrement autour d'un axe commun (AC) autour duquel ces éléments élastiques (3) comportent chacun une zone de contact (4), ces zones de contact (4) définissant ensemble une ouverture (5) agencée pour coopérer par chassage et serrage élastique avec l'arbre (30), de façon à faire coïncider cet axe commun (AC) avec l'axe de rotation (D) de l'arbre (30), et à appliquer à l'arbre (30) un effort de freinage tangentiel sensiblement constant.Clock mechanism (100) comprising a structure (20) in which a shaft (30) of a mobile (40) is pivoted along an axis of rotation (D) and comprising a braking device (10) for braking mechanical constant torque of this shaft (30), this braking device (10) comprises a brake component (1) removable from the structure (20) and which comprises, for its attachment to the structure, a serge (2) ), which carries a plurality of elastic elements (3), regularly distributed around a common axis (AC) around which these elastic elements (3) each comprise a contact zone (4), these contact zones (4). ) together defining an opening (5) arranged to cooperate by driving and elastic clamping with the shaft (30), so as to make this common axis (AC) coincide with the axis of rotation (D) of the shaft (30). ), and to apply to the shaft (30) a substantially constant tangential braking force.

Description

Domaine de l'inventionField of the invention

L'invention concerne un mécanisme d'horlogerie comportant au moins une structure dans laquelle est pivoté au moins un arbre d'un mobile selon un axe de rotation, ledit mécanisme comportant au moins un dispositif de freinage pour le freinage mécanique à couple constant d'un dit arbre.The invention relates to a clockwork mechanism comprising at least one structure in which at least one shaft of a moving body is pivoted along an axis of rotation, said mechanism comprising at least one braking device for mechanical braking with a constant torque of a said tree.

L'invention concerne encore un mouvement d'horlogerie comportant au moins un tel mécanisme d'horlogerie.The invention also relates to a watch movement comprising at least one such clock mechanism.

L'invention concerne encore une montre comportant au moins un tel mouvement et/ou au moins un tel mécanisme d'horlogerie.The invention also relates to a watch comprising at least one such movement and / or at least one such watch mechanism.

L'invention concerne le domaine des mécanismes d'horlogerie, en particulier des mécanismes d'affichage.The invention relates to the field of watch mechanisms, in particular display mechanisms.

Arrière-plan de l'inventionBackground of the invention

Dans un rouage non tendu, le jeu angulaire des mobiles d'affichage se traduit par un effet visuel désagréable pour l'utilisateur, appelé chevrotement, comme classiquement visible sur une aiguille d'un affichage de petite seconde à rouage non tendu.In an untensioned gear, the angular clearance of the display mobiles results in an unpleasant visual effect for the user, called a bucking, as conventionally visible on a needle of a small seconds display with an unstretched wheel.

Certains systèmes existent déjà tel que les freins magnétiques, les dentures flexibles ou les ressorts servant de frein. Ce sont souvent des ressorts chips (clinquants) ou des lames frottant sur le mobile, qui présentent l'inconvénient d'induire une grande variation de force de frottement et donc une perturbation variable de la marche.Some systems already exist such as magnetic brakes, flexible teeth or springs acting as brake. These are often springs chips (foils) or blades rubbing on the mobile, which have the disadvantage of inducing a large variation of friction force and thus a variable disturbance of walking.

Résumé de l'inventionSummary of the invention

L'invention se propose de réduire de manière simple et économique le jeu angulaire au niveau des mobiles d'affichage dans un rouage non tendu.The invention proposes to simply and economically reduce the angular clearance at the mobile display in an unstressed wheel.

A cet effet, l'invention concerne un mécanisme d'horlogerie selon la revendication 1.For this purpose, the invention relates to a timepiece mechanism according to claim 1.

L'invention concerne encore un mouvement d'horlogerie comportant au moins un tel mécanisme d'horlogerie.The invention further relates to a watch movement comprising at least one such clock mechanism.

L'invention concerne encore une montre comportant au moins un tel mouvement et/ou au moins un tel mécanisme d'horlogerie.The invention also relates to a watch comprising at least one such movement and / or at least one such watch mechanism.

Description sommaire des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre, en référence aux dessins annexés, où :

  • la figure 1 représente, de façon schématisée, partielle, et en coupe, une partie d'un mouvement d'horlogerie comportant un mécanisme selon l'invention, avec un mobile dont l'arbre est pivoté, d'un premier côté, de façon classique, par rapport à la structure du mouvement, et, d'une deuxième côté opposé, dans un dispositif de freinage agencé pour le freinage mécanique à couple constant de ce mobile, dans une première variante;
  • la figure 2 représente, de façon schématisée, et en vue en plan, ce dispositif de freinage selon cette première variante, comportant une serge massive sensiblement circulaire, porteuse d'éléments élastiques agencés pour porter et freiner l'arbre du mobile;
  • la figure 3 représente, de façon schématisée, partielle, et en perspective, un tel mécanisme avec un dispositif de freinage selon la première variante ;
  • la figure 4 représente, de façon analogue à la figure 1, un autre mécanisme selon l'invention, selon une deuxième variante du dispositif de freinage qui comporte une fourche sur un côté de sa serge, et où cette fourche coopère avec jeu avec un verrou de limitation, lequel est fixé sur la structure du mouvement ;
  • la figure 5 représente, de façon analogue à la figure 2, le dispositif de freinage selon cette première variante ;
  • la figure 6 représente, de façon analogue à la figure 3, ce mécanisme selon la deuxième variante ;
  • la figure 7 représente, de façon schématisée, et en vue de dessus, ce mécanisme selon la deuxième variante ;
  • la figure 8 représente, de façon schématisée, partielle, et en perspective éclatée, ce mécanisme selon la deuxième variante ;
  • la figure 9 représente, de façon schématisée, et en perspective, ce même mécanisme lors de la mise en coopération d'une partie étroite du verrou de limitation au travers de l'ouverture de la fourche ;
  • la figure 10 représente, de la même façon, ce même mécanisme lors de la mise en coopération d'une partie large du verrou de limitation en limitation axiale de la fourche ;
  • la figure 11 représente, de la même façon, ce même mécanisme dans sa position de service après la mise en coopération d'une partie large du verrou de limitation en limitation axiale de la fourche ;
  • la figure 12 représente, de la même façon, ce même mécanisme dans une autre implantation, par rapport à la structure du mouvement, du même verrou, par rapport au même dispositif de freinage ;
  • la figure 13 est un schéma-blocs représentant une montre comportant un mouvement avec un tel mécanisme.
Other features and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended drawings, in which:
  • the figure 1 represents, schematically, partially, and in section, a part of a clockwork movement comprising a mechanism according to the invention, with a mobile whose shaft is pivoted, on a first side, in a conventional manner, by relative to the structure of the movement, and, on a second opposite side, in a braking device arranged for the constant torque mechanical braking of this mobile, in a first variant;
  • the figure 2 represents, schematically, and in plan view, this braking device according to this first variant, comprising a substantially circular massive serge, carrying elastic elements arranged to carry and brake the shaft of the mobile;
  • the figure 3 represents, schematically, partially, and in perspective, such a mechanism with a braking device according to the first variant;
  • the figure 4 represents, in a similar way to figure 1 , another mechanism according to the invention, according to a second variant of the braking device which comprises a fork on one side of its serge, and wherein this fork cooperates with clearance with a limitation lock, which is fixed on the structure of the movement;
  • the figure 5 represents, in a similar way to figure 2 , the braking device according to this first variant;
  • the figure 6 represents, in a similar way to figure 3 this mechanism according to the second variant;
  • the figure 7 represents, schematically, and in top view, this mechanism according to the second variant;
  • the figure 8 represents, schematically, partially, and exploded perspective, this mechanism according to the second variant;
  • the figure 9 represents, schematically, and in perspective, the same mechanism during the cooperation of a narrow portion of the limitation lock through the opening of the fork;
  • the figure 10 represents, in the same way, the same mechanism during the co-operation of a large part of the limitation lock in axial limitation of the fork;
  • the figure 11 represents, in the same way, the same mechanism in its service position after the cooperation of a large part of the limitation lock in axial limitation of the fork;
  • the figure 12 represents, in the same way, this same mechanism in another implantation, with respect to the structure of the movement, of the same lock, with respect to the same braking device;
  • the figure 13 is a block diagram showing a watch having a movement with such a mechanism.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

L'invention concerne un mécanisme d'horlogerie 100 comportant au moins une structure 20 dans laquelle est pivoté au moins un arbre 30 d'un mobile 40 selon un axe de rotation D.The invention relates to a clockwork mechanism 100 comprising at least one structure 20 in which at least one shaft 30 of a mobile 40 is pivoted along an axis of rotation D.

Ce mécanisme 100 comporte au moins un dispositif de freinage 10 pour le freinage mécanique à couple constant d'un arbre 30.This mechanism 100 comprises at least one braking device 10 for the constant torque mechanical braking of a shaft 30.

Selon l'invention, ce dispositif de freinage 10 comporte un composant de freinage 1, qui est amovible par rapport à la structure 20, et qui comporte, pour sa fixation à la structure, une serge 2 massive, laquelle porte une pluralité d'éléments élastiques 3.According to the invention, this braking device 10 comprises a braking component 1, which is removable relative to the structure 20, and which comprises, for its attachment to the structure, a massive serge 2, which carries a plurality of elements elastic 3.

Ces éléments élastiques 3 sont de préférence identiques et répartis régulièrement autour d'un axe commun AC autour duquel ces éléments élastiques 3 comportent chacun une zone de contact 4. Les zones de contact 4 définissent ensemble une ouverture 5, qui est agencée pour coopérer par chassage et serrage élastique avec un arbre 30, de façon à faire coïncider l'axe commun AC avec l'axe de rotation D de l'arbre 30, et à appliquer à l'arbre 30 un effort de freinage tangentiel sensiblement constant.These elastic elements 3 are preferably identical and regularly distributed around a common axis AC around which these elastic elements 3 each comprise a contact zone 4. The contact zones 4 together define an opening 5, which is arranged to cooperate by driving. and elastic clamping with a shaft 30, so as to make the common axis AC coincide with the axis of rotation D of the shaft 30, and to apply to the shaft 30 a substantially constant tangential braking force.

La valeur du serrage sur l'arbre dépend bien sûr de l'application. Pour les applications horlogères courantes ce serrage peut être réalisé entre un serrage faible, de l'ordre de 5 micromètres au rayon, et un serrage fort, de l'ordre de 10 micromètres au rayon.The value of the clamping on the shaft depends of course on the application. For current horological applications this clamping can be achieved between a low clamping, of the order of 5 micrometers to the radius, and a strong clamping, of the order of 10 micrometers to the radius.

On comprend que ces éléments élastiques 3 peuvent aussi, chacun, être une combinaison d'éléments élastiques, non nécessairement identiques, ni nécessairement répartis régulièrement autour de l'axe commun AC, mais il est nécessaire que la résultante des forces d'appui qu'ils exercent sur un arbre 30 soit nulle, et que la répartition de couple qu'ils exercent sur cet arbre 30 soit régulière.It is understood that these elastic elements 3 can also, each, be a combination of elastic elements, not necessarily identical, nor necessarily regularly distributed around the common axis AC, but it is necessary that the resultant forces support that they exercise on a shaft 30 is zero, and that the distribution of torque they exert on this shaft 30 is regular.

On peut bien sûr envisager de chasser dans la structure 20 un composant de freinage 1 tel qu'illustré sur la figure 2. Toutefois une telle configuration exige l'absence totale de bavures, et une précision d'usinage élevée ce qui se traduit par des coûts de fabrication.It is of course conceivable to hunt in the structure 20 a braking component 1 as illustrated in FIG. figure 2 . However, such a configuration requires the total absence of burrs, and high machining precision which results in manufacturing costs.

Aussi il est avantageux, dans une mise en oeuvre particulière, de réaliser un composant de freinage 1 auto-centrant, libre selon deux degrés de liberté dans un plan, mais maintenu sur la troisième dimension, en hauteur, par un verrou.Also it is advantageous, in a particular implementation, to make a self-centering braking component 1, free in two degrees of freedom in a plane, but maintained on the third dimension, in height, by a lock.

Ainsi, plus particulièrement, le dispositif de freinage 10 comporte encore un verrou 6 de positionnement. Ce verrou 6 est agencé pour être fixé sur une implantation 26 que comporte la structure 20, en emprisonnant le composant de freinage 1 de façon à lui permettre un jeu axial limité à une valeur axiale bornée, selon la direction de l'axe commun AC, et/ou à lui permettre un jeu angulaire limité à une valeur angulaire bornée, dans un plan perpendiculaire à l'axe commun AC. Ainsi, dans cette variante avantageuse, le composant de freinage 1 n'est plus garni dans la structure 20, mais positionné par ce verrou 6, lequel ne bloque pas le composant de freinage 1. Le verrou 6 laisse un degré de liberté radial et axial au composant de freinage 1, de sorte à que celui-ci s'auto-centre et compense ainsi les variations géométriques.Thus, more particularly, the braking device 10 further comprises a positioning lock 6. This lock 6 is arranged to be fixed on an implantation 26 that includes the structure 20, by trapping the braking component 1 so as to allow it an axial play limited to a bounded axial value, in the direction of the common axis AC, and / or to allow it an angular clearance limited to a bounded angular value, in a plane perpendicular to the common axis AC. Thus, in this advantageous variant, the braking component 1 is no longer lodged in the structure 20, but positioned by this latch 6, which does not block the braking component 1. The latch 6 leaves a radial and axial degree of freedom brake component 1, so that it self-center and thus compensates for geometric variations.

Dans une variante particulière illustrée par les figures, le composant de freinage 1 comporte, dans un plan perpendiculaire à l'axe commun AC, une fourche 7. Cette fourche 7 est agencée pour entourer une portée 9 du verrou 6 avec un jeu correspondant à la valeur angulaire bornée. Une face supérieure 71 de cette fourche 7 est agencée pour coopérer en appui de butée avec au moins une face inférieure 81, que comporte une collerette 8 du verrou 6, pour limiter la course axiale du composant de freinage 1.In a particular variant illustrated by the figures, the braking component 1 comprises, in a plane perpendicular to the common axis AC, a fork 7. This fork 7 is arranged to surround a bearing surface 9 of the lock 6 with a clearance corresponding to the bounded angular value. An upper face 71 of this fork 7 is arranged to cooperate in abutment abutment with at least one lower face 81, which comprises a collar 8 of the lock 6, to limit the axial stroke of the brake component 1.

Plus particulièrement, cette collerette 8 comporte, selon une première direction, une partie étroite de largeur LE inférieure à l'ouverture de la fourche 7, pour permettre l'insertion du composant de freinage 1 sur l'arbre 30 à proximité du verrou 7 fixé dans une première position angulaire d'insertion, sur la structure 20. La collerette 8 comporte, selon une deuxième direction de préférence mais non limitativement orthogonale à la première direction, une partie large, qui est de largeur LL supérieure à l'ouverture LO de la fourche 7. Cette partie large porte la au moins une face inférieure 81 qui immobilise axialement la fourche 7 dans une deuxième position angulaire de verrouillage du verrou 6.More particularly, this flange 8 comprises, in a first direction, a narrow portion of width LE less than the opening of the fork 7, to allow the insertion of the brake component 1 on the shaft 30 near the lock 7 fixed in a first angular position of insertion, on the structure 20. The flange 8 comprises, in a second direction, preferably but not limitatively orthogonal to the first direction, a wide portion, which is of greater width LL than the opening LO of the fork 7. This wide portion carries the at least one lower face 81 which axially immobilizes the fork 7 in a second angular position for locking the lock 6.

Le verrou 6 peut être simplement chassé dans l'implantation 26 de la structure 20, dans d'autres variantes il peut être monté vissé, ou avec une liaison à baïonnette, ou autre. Le jeu axial, comme le jeu radial, est de préférence, et non limitativement, compris entre 10 et 30 micromètres, plus particulièrement entre 15 et 25 micromètres.The lock 6 can be simply driven into the implantation 26 of the structure 20, in other variants it can be mounted screwed, or with a bayonet connection, or other. The axial clearance, such as the radial clearance, is preferably, and not exclusively, between 10 and 30 microns, more particularly between 15 and 25 microns.

Dans une variante particulière, la serge 2 du composant de freinage 1 comporte, dans un plan perpendiculaire à l'axe commun AC, des dégagements creux 12, diamétralement opposés deux à deux par rapport à l'axe commun AC, et qui sont prévus pour la manutention du composant de freinage 1 par une pince de manipulateur robotisé, ou encore pour une préhension facile par les brucelles d'un opérateur.In a particular variant, the serge 2 of the braking component 1 comprises, in a plane perpendicular to the common axis AC, hollow recesses 12, diametrically opposite two by two with respect to the common axis AC, and which are provided for the handling of the braking component 1 by robotic manipulator clamp, or for easy gripping by the tweezers of an operator.

Le composant de freinage 1 peut être simplement posé sur une surface d'appui de la structure 20, sur laquelle il est de préférence maintenu par le verrou 6. Dans une variante particulière, la serge 2 du composant de freinage 1 comporte, dans un plan perpendiculaire à l'axe commun AC, des butées radiales 11 qui sont agencées pour coopérer en appui de butée radial avec un chambrage 21 que comporte la structure 20, pour limiter la course radiale de l'axe commun AC par rapport à l'axe de rotation D de l'arbre 30. Plus particulièrement, ces butées radiales 11 sont alternées avec tout ou partie des dégagements 12, quand le composant de freinage 1 en comporte.The braking component 1 can simply be placed on a bearing surface of the structure 20, on which it is preferably held by the latch 6. In a particular variant, the serge 2 of the braking component 1 comprises, in a plane perpendicular to the common axis AC, radial stops 11 which are arranged to cooperate in radial abutment abutment with a recess 21 that includes the structure 20, to limit the radial stroke of the common axis AC relative to the axis of rotation D of the shaft 30. More particularly, these radial stops 11 are alternated with all or part of the clearances 12, when the brake component 1 comprises.

Dans une application particulière de ce mécanisme d'horlogerie 100, un mobile 40 est un mobile d'affichage de petite seconde, dont l'arbre est en général roulé et légèrement conique. La solution offerte par l'invention est bien adaptée à ce cas de figure, en raison du coût modéré, du faible encombrement, de la précision et de l'état de surface des composants en présence, et du montage aisé en raison du cône de l'arbre du mobile.In a particular application of this timepiece mechanism 100, a mobile 40 is a small second display mobile, whose shaft is generally rolled and slightly conical. The solution offered by the invention is well suited to this case, because of the moderate cost, the small size, the accuracy and the surface condition of the components in the presence, and the easy assembly because of the cone of the mobile tree.

Dans une autre variante, la structure 20 comporte une pluralité d'implantations, qui sont agencées pour le pivotement de différents arbres 30 de mobiles 40 différents, autour d'une même implantation 26, laquelle est agencée pour recevoir un verrou 6 apte à coopérer avec un composant de freinage 1 agencé sur l'un quelconque des arbres 30. Ainsi, par exemple, le système permet de gérer des entraxes différents de petite seconde, tout en utilisant les mêmes composants.In another variant, the structure 20 comprises a plurality of implantations, which are arranged for the pivoting of different shafts 30 of different mobiles 40, around a single implantation 26, which is arranged to receive a latch 6 adapted to cooperate with a braking component 1 arranged on any one of the shafts 30. Thus, for example, the system can manage different distances of small seconds, while using the same components.

Dans une autre variante encore, la serge 2 du composant de freinage 1 comporte une portée périphérique qui est agencée pour, dans un plan perpendiculaire à l'axe commun AC, coopérer avec serrage avec un chambrage 21 que comporte la structure 20.In yet another variant, the serge 2 of the braking component 1 comprises a peripheral bearing which is arranged for, in a plane perpendicular to the common axis AC, to cooperate with clamping with a recess 21 which the structure 20 comprises.

Dans une exécution particulière, le composant de freinage 1 est monobloc et en matériau micro-usinable, tel que silicium, DLC, ou autre. La fabrication par un procédé lithographique ou similaire garantit une grande précision géométrique, et un bon état de surface et qui est surtout répétitif.In a particular embodiment, the braking component 1 is monobloc and made of micro-machinable material, such as silicon, DLC, or other. Manufacture by a lithographic process or similar ensures high geometric accuracy, and a good surface and is mostly repetitive.

L'invention concerne encore un mouvement d'horlogerie 200 comportant au moins un tel mécanisme d'horlogerie 100.The invention also relates to a watch movement 200 comprising at least one such watch mechanism 100.

Une application particulière de l'invention concerne son application à un mécanisme de chronographe.A particular application of the invention relates to its application to a chronograph mechanism.

L'invention concerne encore une montre 300 comportant au moins un tel mouvement 200 et/ou au moins un tel mécanisme d'horlogerie 100.The invention also relates to a watch 300 comprising at least one such movement 200 and / or at least one such watch mechanism 100.

En somme, l'utilisation d'un composant de freinage, tel que décrit ci-dessus, analogue à une rondelle à bras flexibles venant frotter sur le pivot d'un mobile, notamment d'une roue de petite seconde, est particulièrement avantageuse, en raison de la reproductibilité du comportement du mobile, due au procédé de fabrication du composant de freinage. Dans l'exemple du pivot de la roue de petite seconde, l'invention profite également de la bonne précision géométrique et du bon état de surface induit par le roulage. La variation de force de frottement, rédhibitoire dans l'art antérieur, est réduite, voire éliminée, ce qui induit une variation moindre de la marche.In sum, the use of a braking component, as described above, similar to a washer with flexible arms rubbing on the pivot of a mobile, including a small seconds wheel, is particularly advantageous, because of the reproducibility of the behavior of the mobile, due to the manufacturing process of the braking component. In the example of the pivot of the small second wheel, the invention also benefits from the good geometric accuracy and good surface condition induced by rolling. The friction force variation, unacceptable in the prior art, is reduced or even eliminated, which induces a lower variation of the gait.

Claims (11)

Mécanisme d'horlogerie (100) comportant au moins une structure (20) dans laquelle est pivoté au moins un arbre (30) d'un mobile (40) selon un axe de rotation (D), ledit mécanisme (100) comportant au moins un dispositif de freinage (10) pour le freinage mécanique à couple constant d'un dit arbre (30), caractérisé en ce que ledit dispositif de freinage (10) comporte un composant de freinage (1) amovible par rapport à ladite structure (20) et qui comporte, pour sa fixation à ladite structure, une serge (2) massive, laquelle porte une pluralité d'éléments élastiques (3), identiques et répartis régulièrement autour d'un axe commun (AC) autour duquel lesdits éléments élastiques (3) comportent chacun une zone de contact (4), lesdites zones de contact (4) définissant ensemble une ouverture (5) agencée pour coopérer par chassage et serrage élastique avec un dit arbre (30), de façon à faire coïncider ledit axe commun (AC) avec ledit axe de rotation (D) dudit arbre (30), et à appliquer audit arbre (30) un effort de freinage tangentiel sensiblement constant.Clock mechanism (100) comprising at least one structure (20) in which at least one shaft (30) of a mobile (40) is pivoted along an axis of rotation (D), said mechanism (100) comprising at least a braking device (10) for the constant torque mechanical braking of a said shaft (30), characterized in that said braking device (10) comprises a brake component (1) removable from said structure (20). ) and which comprises, for its attachment to said structure, a serge (2) massive, which carries a plurality of identical elastic elements (3) and regularly distributed around a common axis (AC) around which said elastic elements ( 3) each comprise a contact zone (4), said contact zones (4) together defining an opening (5) arranged to cooperate by driving and elastic clamping with a said shaft (30), so as to make said common axis coincide (AC) with said axis of rotation (D) of said shaft (30), and applying to said shaft (30) a substantially constant tangential braking force. Mécanisme d'horlogerie (100) selon la revendication 1, caractérisé en ce que ledit dispositif de freinage (10) comporte encore un verrou (6) de positionnement, agencé pour être fixé sur une implantation (26) que comporte ladite structure (20) en emprisonnant ledit composant de freinage (1) de façon à lui permettre un jeu axial limité à une valeur axiale bornée, selon la direction dudit axe commun (AC), et/ou à lui permettre un jeu angulaire limité à une valeur angulaire bornée, dans un plan perpendiculaire audit axe commun (AC).Clock mechanism (100) according to claim 1, characterized in that said braking device (10) further comprises a latch (6) for positioning, arranged to be fixed on an implantation (26) that includes said structure (20) by trapping said braking component (1) so as to allow it to have an axial clearance limited to a bounded axial value, in the direction of said common axis (AC), and / or to allow it to have an angular clearance limited to a bounded angular value, in a plane perpendicular to said common axis (AC). Mécanisme d'horlogerie (100) selon la revendication 2, caractérisé en ce que ledit composant de freinage (1) comporte, dans un plan perpendiculaire audit axe commun (AC), une fourche (7) agencée pour entourer une portée (9) dudit verrou (6) avec un jeu correspondant à ladite valeur angulaire bornée, et dont une face supérieure (71) de ladite fourche (7) est agencée pour coopérer en appui de butée avec au moins une face inférieure (81) que comporte une collerette (8) dudit verrou (6) pour limiter la course axiale dudit composant de freinage (1).Clock mechanism (100) according to claim 2, characterized in that said braking component (1) comprises, in a plane perpendicular to said common axis (AC), a fork (7) arranged to surround a bearing surface (9) of said latch (6) with a clearance corresponding to said bounded angular value, and an upper face (71) of said fork (7) is arranged to cooperate abutting abutment with at least one lower face (81) that comprises a flange ( 8) of said latch (6) to limit the axial stroke of said brake component (1). Mécanisme d'horlogerie (100) selon la revendication 3, caractérisé en ce que ladite collerette (8) comporte, selon une première direction, une partie étroite de largeur inférieure à l'ouverture de ladite fourche (7), pour permettre l'insertion dudit composant de freinage (1) sur ledit arbre (30) à proximité dudit verrou (7) fixé dans une première position angulaire d'insertion, sur ladite structure (20), et comporte, selon une deuxième direction orthogonale à ladite première direction, une partie large de largeur supérieure à l'ouverture de ladite fourche (7), et portant ladite au moins une face inférieure (81) qui immobilise axialement ladite fourche (7) dans une deuxième position angulaire de verrouillage dudit verrou (6).Clock mechanism (100) according to claim 3, characterized in that said flange (8) comprises, in a first direction, a narrow portion of width less than the opening of said fork (7), to allow insertion said brake component (1) on said shaft (30) near said latch (7) fixed in a first insertion angular position, on said structure (20), and comprises, in a second direction orthogonal to said first direction, a part width wider than the opening of said fork (7), and carrying said at least one lower face (81) which axially immobilizes said fork (7) in a second angular position for locking said latch (6). Mécanisme d'horlogerie (100) selon l'une des revendications 2 à 4, caractérisé en ce que ladite serge (2) dudit composant de freinage (1) comporte, dans un plan perpendiculaire audit axe commun (AC), des butées radiales (11) agencées pour coopérer en appui de butée radial avec un chambrage (21) que comporte ladite structure (20), pour limiter la course radiale dudit axe commun (AC) par rapport audit axe de rotation (D) dudit arbre (30).Clock mechanism (100) according to one of claims 2 to 4, characterized in that said serge (2) of said brake component (1) comprises, in a plane perpendicular to said common axis (AC), radial stops ( 11) arranged to cooperate in abutment radial abutment with a recess (21) that comprises said structure (20), to limit the radial stroke of said common axis (AC) relative to said axis of rotation (D) of said shaft (30). Mécanisme d'horlogerie (100) selon l'une des revendications 2 à 5, caractérisé en ce que ladite structure (20) comporte une pluralité d'implantations agencées pour le pivotement de différents dits arbres (30) de dits mobiles (40) différents, autour d'une même dite implantation (26) agencée pour recevoir un dit verrou (6) apte à coopérer avec un dit composant de freinage (1) agencé sur l'un quelconque desdits arbres (30).Clock mechanism (100) according to one of claims 2 to 5, characterized in that said structure (20) comprises a plurality of implantations arranged for the pivoting of said different shafts (30) said mobile (40) around one said implantation (26) arranged to receive a said latch (6) adapted to cooperate with a said braking component (1) arranged on any one of said shafts (30). Mécanisme d'horlogerie (100) selon la revendication 1, caractérisé en ce que ladite serge (2) dudit composant de freinage (1) comporte une portée périphérique agencée pour, dans un plan perpendiculaire audit axe commun (AC), coopérer avec serrage avec un chambrage (21) que comporte ladite structure (20).Clock mechanism (100) according to claim 1, characterized in that said serge (2) of said braking component (1) comprises a peripheral surface arranged for, in a plane perpendicular to said common axis (AC), to cooperate with interference with a recess (21) that comprises said structure (20). Mécanisme d'horlogerie (100) selon l'une des revendications 1 à 7, caractérisé en ce que ledit composant de freinage (1) est monobloc et en matériau micro-usinable.Clock mechanism (100) according to one of claims 1 to 7, characterized in that said brake component (1) is monobloc and micro-machinable material. Mécanisme d'horlogerie (100) selon l'une des revendications 1 à 8, caractérisé en ce qu'un dit mobile (40) est un mobile d'affichage de petite seconde.Clock mechanism (100) according to one of claims 1 to 8, characterized in that a said mobile (40) is a small second display mobile. Mouvement d'horlogerie (200) comportant au moins un mécanisme d'horlogerie (100) selon une des revendications 1 à 9.Clockwork movement (200) comprising at least one watch mechanism (100) according to one of Claims 1 to 9. Montre (300) comportant au moins un mécanisme d'horlogerie (100) selon une des revendications 1 à 9.Watch (300) comprising at least one watch mechanism (100) according to one of Claims 1 to 9.
EP17167802.2A 2017-04-24 2017-04-24 Mechanical braking device for a clock wheel Active EP3396470B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17167802.2A EP3396470B1 (en) 2017-04-24 2017-04-24 Mechanical braking device for a clock wheel
US15/935,618 US10816933B2 (en) 2017-04-24 2018-03-26 Mechanical braking device for timepiece wheel set
JP2018059298A JP6467541B2 (en) 2017-04-24 2018-03-27 Mechanical braking device for timer car set
CN201810367679.6A CN108732904B (en) 2017-04-24 2018-04-23 Mechanical braking device for a timepiece wheel set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17167802.2A EP3396470B1 (en) 2017-04-24 2017-04-24 Mechanical braking device for a clock wheel

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EP3396470A1 true EP3396470A1 (en) 2018-10-31
EP3396470B1 EP3396470B1 (en) 2020-01-01

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EP3719583A1 (en) 2019-04-03 2020-10-07 ETA SA Manufacture Horlogère Suisse Mechanical braking device for a clock mobile
EP4123394A1 (en) 2021-07-22 2023-01-25 Rolex Sa Ring for mechanical connection of two timepiece components
EP4242753A1 (en) 2022-03-11 2023-09-13 ETA SA Manufacture Horlogère Suisse Device for guiding a shaft of a balance wheel with hairspring
EP4242752A1 (en) 2022-03-11 2023-09-13 ETA SA Manufacture Horlogère Suisse Device for guiding a shaft of a balance wheel with hairspring

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EP3719583A1 (en) 2019-04-03 2020-10-07 ETA SA Manufacture Horlogère Suisse Mechanical braking device for a clock mobile
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EP4123394A1 (en) 2021-07-22 2023-01-25 Rolex Sa Ring for mechanical connection of two timepiece components
EP4242753A1 (en) 2022-03-11 2023-09-13 ETA SA Manufacture Horlogère Suisse Device for guiding a shaft of a balance wheel with hairspring
EP4242752A1 (en) 2022-03-11 2023-09-13 ETA SA Manufacture Horlogère Suisse Device for guiding a shaft of a balance wheel with hairspring

Also Published As

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US20180307183A1 (en) 2018-10-25
CN108732904A (en) 2018-11-02
JP6467541B2 (en) 2019-02-13
EP3396470B1 (en) 2020-01-01
JP2018185293A (en) 2018-11-22
US10816933B2 (en) 2020-10-27
CN108732904B (en) 2020-03-27

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