EP3112956B1 - Retrograde chronograph mechanism with rattrapante hand - Google Patents

Retrograde chronograph mechanism with rattrapante hand Download PDF

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Publication number
EP3112956B1
EP3112956B1 EP16177230.6A EP16177230A EP3112956B1 EP 3112956 B1 EP3112956 B1 EP 3112956B1 EP 16177230 A EP16177230 A EP 16177230A EP 3112956 B1 EP3112956 B1 EP 3112956B1
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EP
European Patent Office
Prior art keywords
chronograph
split
wheel
time
cam
Prior art date
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Active
Application number
EP16177230.6A
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German (de)
French (fr)
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EP3112956A1 (en
Inventor
Yannick PINTUS
Micke PINTUS
Jean-Luc Perrin
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Richemont International SA
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Richemont International SA
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Publication of EP3112956A1 publication Critical patent/EP3112956A1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0866—Special arrangements
    • G04F7/0876—Split-time function, e.g. rattrappante
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/08—Geometrical arrangement of the graduations
    • G04B19/082—Geometrical arrangement of the graduations varying from the normal closed scale
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/08—Geometrical arrangement of the graduations
    • G04B19/087—Geometrical arrangement of the graduations with several separate scales
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
    • G04F7/0857—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with single push-button or actuation member for start-stop and reset
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0866—Special arrangements

Definitions

  • the present invention relates to a retrograde chronograph mechanism for a watch movement, intended to ensure, on demand, the driving of a first display member of a unit of a measured time, preferably seconds of a measured time. such that the display member has a retrograde movement, i.e., it is driven to move in a sector less than 360 degrees.
  • timepieces have been presented so far which include a chronograph mechanism with retrograde display of at least one unit of a measured time.
  • the patent application WO 2005/091086 A1 describes and illustrates a timepiece with electronic movement arranged to present a retrograde display tenths of seconds and a retrograde display hundredths of seconds. Because of the use of an electronic movement, it is clear that this invention lies more in the manner of presenting the information than in the construction that achieves the desired display.
  • the patent application EP 1024416 A2 describes another example of chronograph mechanism, mechanical this time.
  • the purpose of the construction presented in this application is to order a display of fractions of seconds of measured time and to take up typical elements mechanisms used to make retrograde displays.
  • the display unit of fractions of seconds does not exactly follow a retrograde movement, in the conventional sense, insofar as the display of the number of fractions of seconds measured is done on demand, whereas the mechanism is stopped to avoid any risk of damage.
  • the Hublot brand has introduced several models of mechanical watches containing the same movement including a bi-retrograde chronograph mechanism, within a collection called Big Bang Unico Bi-Retrograd Chrono. This watch movement is arranged to control the movements of retrograde display hands of seconds and minutes of time measured. The two needles move opposite two concentric graduated sectors.
  • the patent application WO2012 / 104688A1 has a timepiece construction, preferably with a chronograph function, comprising a second display member associated with a display element fractions of seconds, these two bodies being concentric for questions related to the readability of the display corresponding.
  • This document presents a large number of theoretical principles relating to alternative embodiments without however going into the corresponding construction details.
  • it evokes the possibility of associating the two display members of the seconds and fractions of seconds with display devices of the catch-up type.
  • Such a possibility involves having at least four display drive mobiles in a coaxial manner while these mobiles are very sensitive, even six mobile if the display of the current hours and minutes also remains coaxial with the other displays.
  • the skilled person is generally reluctant to embark on this type of very delicate constructions.
  • chronograph mechanisms Some inventions relating to chronograph mechanisms also relate to known constructions and aims to improve the operation and / or reliability or to simplify the development.
  • a main object of the present invention is to propose a chronograph mechanism of the type mentioned above, that is to say with a retrograde display, representing an important technical advance in the field of chronograph mechanisms by the implementation of a rare complication taking a novel form and to ensure a good readability of the information provided by the corresponding timepiece.
  • split-second chronograph mechanisms are relatively rare and are even more complex to develop than conventional chronograph mechanisms.
  • the catch-up mechanism controls the movements of a second display hand of a measured intermediate time which is positioned under the second chronograph hand, being pivoted to the center of the dial of the corresponding timepiece.
  • the readability of these watches is often reduced as we finally end up with four hands pivoted in the center, with those of minutes and hours.
  • the features of the present invention that is to say the implementation of a retrograde retrograde needle, it becomes possible to associate such a needle to a retrograde chronograph mechanism and to provide a sector of specific display for measured times.
  • the legibility of the corresponding timepiece can thus be improved with reference to known timepieces. It is possible to arrange the two needles in such a way that they are superimposed as is the case usually, but one can also consider, as an alternative, a specific display sector for each of the hands if the occupation of the dial by other functions of the timepiece allows it.
  • the retrograde drive of the chronograph mobile comprises a chronograph cam rotated from the chronograph counter and associated with a chronograph rocker bearing, on the one hand, a probe held in abutment against the cam chronograph rake and, secondly, a chronograph rake having a kinematic connection with the chronograph mobile.
  • the retrograde drive device of the retractable wheel comprises a retracting cam driven in rotation from the split-seconds counter and associated with a catch-up flip-flop bearing, on the one hand, a probe held in abutment against the cam. on the other hand, on the other hand, a catch-up rake having a kinematic connection with the split-seconds mobile.
  • the chronograph counter includes a first chronograph wheel, the retrograde drive of the chronograph mobile comprising a second chronograph wheel rotatably connected to the chronograph cam, the first and second chronograph wheels being arranged engaged with each other.
  • the split-timer counter it is then possible to provide for the split-timer counter to comprise a first split-second wheel, the retrograde-drive device for the split-second mobile comprising a second split-second wheel arranged for rotating the split-second cam, the first and second wheels. catches being arranged in engagement with each other.
  • the first chronograph wheel and the first catch-up wheel are coaxial.
  • the indexing device disengageable comprises a core cam integral with the first chronograph wheel and against which is held in support of a probe carried by a lever pivotally mounted on the first split wheel.
  • the second split-second wheel is rotatably connected to a third catch-up wheel itself arranged in engagement with a split-spring return which is integral in rotation with the split-second cam.
  • the first catch-up wheel has a sufficient thickness to be able to cooperate, on the one hand, with the clamps and, on the other hand, with the second catch-up wheel in respective planes. bunk. Thanks to this characteristic, the small deformations that the teeth of the first split-second wheel is likely to suffer due to the shocks of the clamps do not risk compromising the quality of its meshing with the second split-second wheel.
  • the chronograph counter comprises a heart-shaped, reset cam, integral in rotation with the first chronograph wheel, the split-seconds counter and the retrograde drive device of the second-hand mobile being arranged in such a way that the split-second cam has a rotation frequency equal to twice the rotation frequency of the first chronograph wheel.
  • the chronograph cam has a rotation frequency equal to that of the first chronograph wheel.
  • the catch-up cam preferably has the shape of a simple snail while the chronograph cam has the shape of a double snail.
  • the mechanism comprises an insulator integral with one of the chronograph and catch-up scales, and arranged to act on the other, such that their fall on the cams , chronograph and rattrapante respectively, are synchronized.
  • the present invention also relates to a watch movement provided with a chronograph mechanism corresponding to the features just presented, as well as a timepiece equipped with such a watch movement.
  • the figure 1 represents a simplified front view of a watch movement 1 comprising a chronograph mechanism according to a preferred embodiment of the invention, the movement being illustrated with its visible dial side.
  • the figure 2 represents a front view of a construction detail of the watch movement of the figure 1 while the figure 3 represents a complementary front view of a second construction detail of the watch movement of the figure 1 which is not visible on figures 1 and 2 .
  • the watch movement 1 comprises a plate 2 intended to support the components of the movement including certain components of the chronograph mechanism according to the invention.
  • the plate 2 may also be an auxiliary plate dedicated to the chronograph mechanism and, in this case, a main plate (not shown) located under the auxiliary plate would support the other components of the movement.
  • the watch movement 1 will not be described in detail since many of the elements that compose it do not have a direct impact on the implementation of the present invention.
  • the watch movement 1 is of the type comprising at least two needles (not shown) for displaying the current hours and minutes. These needles are here intended to be off-center towards the midday position. Moreover, the watch movement 1 is arranged to control the movements of a second chronograph hand and a split second hand (shown on the figure 3 ), that is to say a needle intended to display the measured seconds of intermediate time. Preferably, the watch movement 1 is also intended to cause the movements of hands minutes minutes and hours of time measured (not shown). It comprises a source of energy (not visible) intended to cause the movement of these needles through including a finishing train (not visible). Of course, the watch movement 1 may include complications associated with additional display members without departing from the scope of the present invention.
  • the watch movement 1 is here intended to equip a pocket watch comprising a first chronograph control member 4 at 12 o'clock and a second control member 6, at 11 o'clock.
  • the chronograph mechanism illustrated here is of the monopusher type, that is to say that the first control member 4 makes it possible to control all the operating modes of the chronograph mechanism by itself, sequentially, in the order : On, off and then reset. In the absence of action on the second control member 6, the split-second hand has the same movement as the second chronograph hand.
  • a first step the part of the illustrated watch movement relating to the operation of the basic chronograph will be described.
  • the specific operation part of the catch-up mechanism will be described in a second step.
  • the chronograph mechanism comprises a chronograph counter 8, seconds, arranged here at the center of the watch movement 1.
  • the chronograph counter 8 is capable of being rotated from an average wheel 10 of the watch movement by via a conventional clutch device 12.
  • the clutch device 12 comprises a seconds wheel 14, pivoted on a bridge 16 and secured to a pinion (not visible) so that it turns on itself in two minutes.
  • a clutch wheel 18 carried by a clutch rocker 20 is arranged in permanent engagement with the seconds wheel 14.
  • the clutch rocker 20 is pivotable between an engaged position, in which the clutch wheel 18 also meshes with a first wheel of Chronograph 22 of the chronograph counter 8, and a disengaged position in which the clutch wheel 18 is located out of reach of the first chronograph wheel 22.
  • the first chronograph wheel 22 is driven at the rate of one revolution in two minutes.
  • the first chronograph wheel 22 is arranged in permanent engagement with a second chronograph wheel 24, pivotally mounted in particular on a retrograde bridge 26 and forming part of a retrograde drive device of the chronograph seconds.
  • the second chronograph wheel 24 is integral in rotation with a chronograph cam 28, in the form of a double snail.
  • An additional board (not visible) is partially arranged in superposition of the retrograde bridge 26, to ensure the assembly of components of the retrograde driving device, as illustrated in FIG. figure 3 .
  • a chronograph scale 30 is arranged in rotation on the additional plate, the latter comprising a feeler 32 intended to be arranged in abutment against the periphery of the chronograph cam 28 and a toothed rake 34.
  • the latter is arranged in engagement with a mobile chronograph 36, coaxial with the chronograph counter 8 and intended to carry a needle 38 seconds of measured time.
  • a sector graduated from the measured seconds of time 40 is schematized on the figure 3 , this latter extending over an angle of 140 degrees, by way of nonlimiting illustration.
  • the shape of the chronograph cam 28 and the multiplication between the chronograph rake 34 and the chronograph mobile 36 are such that the chronograph hand 38 travels at a 140 degree angle when the chronograph cam 28 turns half a turn, ie once every minute. Then, the feeler 32 falls on the portion of the chronograph cam 28 having the smallest radius and the chronograph hand 38 returns to its initial position, before repeating the same movement as long as the measurement of a time is in progress .
  • An elastic return member (not shown) is provided to act on the chronograph rocker 30 and maintain its probe 32 bearing against the periphery of the chronograph cam 28.
  • the chronograph mechanism also drives a chronograph minute counter 42 in a conventional manner.
  • the chronograph mechanism comprises for this purpose two drive fingers 44, diametrically opposed and integral in rotation with the first chronograph wheel 22, these fingers being intended to advance a step forward a minute 46 each time the Mobile Chronograph 36 travels at an angle of 140 degrees, ie once a minute.
  • the return of the minutes 46 in turn causes a wheel 48 of the minute counter 42 once per minute.
  • the chronograph counter 8 also comprises a conventional reset cam 49, integral with the first chronograph wheel 22.
  • the first control member 4 cooperates with a three-cycle column wheel 50 to rotate it and move from one mode of operation to another.
  • the columns of the column wheel 50 conventionally cooperate with a spout 51 of the clutch rocker 20, with a brake 52 of the chronograph counter 8 and with a reset hammer 54.
  • the latter comprises first and second arms 56, 58 arranged to act respectively on the seconds counter 8 and on the minutes counter 42.
  • Elastic return members are provided, in known manner, to act on these various components and tend to push them back into their position. by default.
  • jumpers are provided for maintain the angular positions of the column wheel 50 and the minute counter 42, when necessary.
  • the catch-up mechanism comprises a split-seconds counter comprising a first split-second wheel 60 coaxial with the first chronograph wheel 22. It furthermore comprises a disengageable indexing device arranged between the first chronograph and split-seconds wheels, in such a way that the angular position of the first catch-up wheel 60 can be indexed to that of the first chronograph wheel 22 when necessary.
  • this disengageable indexing device comprises, in a conventional manner, a core cam (not visible) integral with the first chronograph wheel 22 and a lever 62 pivotally mounted on the first split-second wheel 60, the lever 62 having a probe (not visible, or a roller, alternatively) held in abutment against the periphery of the cam in the heart under the effect of the action of a spring 64 also carried by the first wheel of split-seconds 60.
  • the first split-second wheel 60 follows the first chronograph wheel 22.
  • a pair of conventional splitters 66 are provided for locking the first split-second wheel 60 when the reading of an intermediate measured time is requested by the user.
  • the clamps 66 are movable between a locked position, in which they are arranged in abutment against the toothing of the first split wheel 60, and an unlocked position in which they leave the first split wheel 60 free to rotate.
  • the clamps 66 are controlled in synchronization, in a known manner, by a retreating column wheel 68 arranged to be driven in rotation, step by step, by the second control member 6, to change the condition of the clamps, alternately.
  • first split-second wheel 60 has a permanent kinematic connection with a retrograde counter-clockwise driving device, meshing with a second split-second wheel 70.
  • the thickness of the first split-second wheel 60 is such that, on the one hand, the grippers 66 and, on the other hand, the second catch-up wheel 70 cooperate with it at different levels. of his teeth, in respective superimposed planes.
  • the second split-second wheel 70 is coaxial with the second chronograph wheel 24 and is rotatably connected to a third split-second wheel 72, which is also coaxial, but of smaller diameter.
  • the third catch-up wheel 72 is arranged in engagement with a catch-up return 74 integral in rotation with a split snail cam 76 in the shape of a simple snail.
  • the ratios between the second and third split-seconds wheels and the split-back gear are such that the split-second cam 76 performs a complete turn on itself in one minute.
  • a split-seconds rocker 78 is arranged in rotation on the additional plate, the latter comprising a feeler 80 intended to be arranged in abutment against the periphery of the split-second cam 76 and a toothed rake 82.
  • the latter is arranged in engagement with a rattrapante mobile 84, coaxial with the chronograph counter 8 and intended to carry a needle 86 seconds measured intermediate seconds, called catch-up.
  • a graduated sector of measured intermediate time seconds 88 is schematized on the figure 3 , this extending over an angle of 140 degrees being opposite to the graduated sector 40 seconds of time measured, by way of non-limiting illustration.
  • the shape of the split-second cam 76 and the reduction ratio between the split-second rake 82 and the split-seconds wheel 84 are such that the split-second needle 86 travels at a 140-degree angle when the split-second cam 76 makes a complete turn, either once every minute. Then, the probe 80 falls on the portion of the splitter cam 76 having the smallest radius and the split-second needle 86 returns to its initial position, before repeating the same movement as long as the measurement of a time is in progress .
  • An elastic return member (not shown) is provided to act on the catch-up latch 78 and maintain its feeler 80 bearing against the periphery of the split-second cam 76.
  • the split-second needle 86 may be arranged to move opposite the same graduated sector as the second chronograph hand 38 or, alternatively, on a sector which is specific to it as illustrated in FIG. figure 3 .
  • an isolator 90 can be provided between the chronograph and catcheswitch latch 78, here having the form of a curved spring whose one end is integral with the chronograph rocker 30 and the other end is arranged in support against a pin 92 carried by the latch rocker 78.
  • This isolator 90 ensures a perfect synchronization between the two latches when they fall on the corresponding cams.
  • the chronograph rocker 30 retains the latch rocker 78 until it has fallen. It is only at the moment of its fall that the insulator 90 releases the catch-up latch 78 and also allows it to fall on the portion of the split-second cam 76 of the weakest radius.
  • a timepiece having an original chronograph display can be made, not only the latter being retrograde type, but in addition it is associated with a display of intermediate times also retrograde type.
  • the feeler 80 of the split-seconds rocker 78 is provided with a safety device. to allow it to retract if the reset chronograph was to cause a rotation of the split cam 76 in the counterclockwise direction on the view of the figure 3 .
  • the present teaching may also be adapted to provide the drive of a display member associated with a unit of time other than the second without departing from the scope of the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Measurement Of Unknown Time Intervals (AREA)

Description

Domaine techniqueTechnical area

La présente invention concerne un mécanisme de chronographe rétrograde pour mouvement horloger, destiné à assurer, à la demande, l'entraînement d'un premier organe d'affichage d'une unité d'un temps mesuré, préférablement des secondes d'un temps mesuré, de telle manière que l'organe d'affichage présente un mouvement rétrograde, c'est-à-dire qu'il soit entraîné pour se déplacer suivant un secteur inférieur à 360 degrés.The present invention relates to a retrograde chronograph mechanism for a watch movement, intended to ensure, on demand, the driving of a first display member of a unit of a measured time, preferably seconds of a measured time. such that the display member has a retrograde movement, i.e., it is driven to move in a sector less than 360 degrees.

Ce mécanisme comporte

  • un compteur de chronographe,
  • un dispositif d'embrayage destiné à établir, à la demande, une connexion entre le compteur de chronographe et un mobile d'entraînement du mouvement horloger,
  • un mobile de chronographe destiné à porter le premier organe d'affichage,
  • un dispositif d'entraînement rétrograde du mobile de chronographe présentant une liaison cinématique avec le compteur de chronographe.
This mechanism involves
  • a chronograph counter,
  • a clutch device for establishing, on demand, a connection between the chronograph counter and a driving wheel of the watch movement,
  • a chronograph mobile for carrying the first display member,
  • a retrograde drive device of the chronograph mobile having a kinematic connection with the chronograph counter.

Etat de la techniqueState of the art

Peu de pièces d'horlogerie ont été présentées jusqu'ici qui comprennent un mécanisme de chronographe avec affichage rétrograde d'au moins une unité d'un temps mesuré.Few timepieces have been presented so far which include a chronograph mechanism with retrograde display of at least one unit of a measured time.

A titre d'exemple, la demande de brevet WO 2005/091086 A1 décrit et illustre une pièce d'horlogerie à mouvement électronique agencée pour présenter un affichage rétrograde des dixièmes de secondes ainsi qu'un affichage rétrograde des centièmes de secondes. Du fait de l'utilisation d'un mouvement électronique, on comprend bien que cette invention réside davantage dans la manière de présenter l'information que dans la construction qui permet de parvenir à l'affichage souhaité.For example, the patent application WO 2005/091086 A1 describes and illustrates a timepiece with electronic movement arranged to present a retrograde display tenths of seconds and a retrograde display hundredths of seconds. Because of the use of an electronic movement, it is clear that this invention lies more in the manner of presenting the information than in the construction that achieves the desired display.

La demande de brevet EP 1024416 A2 décrit un autre exemple de mécanisme de chronographe, mécanique cette fois. La construction présentée dans cette demande a pour but de commander un affichage de fractions de secondes de temps mesurés et reprend des éléments typiques de mécanismes utilisés pour réaliser des affichages rétrogrades. Toutefois, dans ce cas, l'organe d'affichage des fractions de secondes ne suit pas exactement un mouvement rétrograde, au sens conventionnel, dans la mesure où l'affichage du nombre de fractions de secondes mesuré se fait à la demande, alors que le mécanisme est à l'arrêt pour éviter tout risque de dommage.The patent application EP 1024416 A2 describes another example of chronograph mechanism, mechanical this time. The purpose of the construction presented in this application is to order a display of fractions of seconds of measured time and to take up typical elements mechanisms used to make retrograde displays. However, in this case, the display unit of fractions of seconds does not exactly follow a retrograde movement, in the conventional sense, insofar as the display of the number of fractions of seconds measured is done on demand, whereas the mechanism is stopped to avoid any risk of damage.

Plus récemment, la marque Hublot a présenté plusieurs modèles de montres mécaniques contenant un même mouvement comprenant un mécanisme de chronographe bi-rétrograde, au sein d'une collection appelée Big Bang Unico Bi-retrograd Chrono. Ce mouvement horloger est agencé pour commander les déplacements d'aiguilles d'affichage rétrograde des secondes et des minutes de temps mesurés. Les deux aiguilles se déplacent en regard de deux secteurs gradués concentriques.More recently, the Hublot brand has introduced several models of mechanical watches containing the same movement including a bi-retrograde chronograph mechanism, within a collection called Big Bang Unico Bi-Retrograd Chrono. This watch movement is arranged to control the movements of retrograde display hands of seconds and minutes of time measured. The two needles move opposite two concentric graduated sectors.

La demande de brevet WO2012/104688A1 présente une construction de pièce d'horlogerie, préférablement à fonction chronographe, comportant un organe d'affichage des secondes associé à un organe d'affichage de fractions de secondes, ces deux organes étant concentriques pour des questions liées à la lisibilité de l'affichage correspondant. Ce document présente un grand nombre de principes théoriques relatifs à des variantes de réalisation sans toutefois entrer dans les détails de construction correspondants. Notamment, il évoque la possibilité d'associer les deux organes d'affichage des secondes et des fractions de secondes à des organes d'affichage de type rattrapante. Une telle possibilité implique de disposer au minimum quatre mobiles d'entraînement d'organes d'affichage de manière coaxiale alors que ces mobiles sont très sensibles, voire six mobiles si l'affichage des heures et des minutes courantes reste également coaxial aux autres affichages. L'homme du métier est généralement peu enclin à se lancer dans ce type de constructions très délicates.The patent application WO2012 / 104688A1 has a timepiece construction, preferably with a chronograph function, comprising a second display member associated with a display element fractions of seconds, these two bodies being concentric for questions related to the readability of the display corresponding. This document presents a large number of theoretical principles relating to alternative embodiments without however going into the corresponding construction details. In particular, it evokes the possibility of associating the two display members of the seconds and fractions of seconds with display devices of the catch-up type. Such a possibility involves having at least four display drive mobiles in a coaxial manner while these mobiles are very sensitive, even six mobile if the display of the current hours and minutes also remains coaxial with the other displays. The skilled person is generally reluctant to embark on this type of very delicate constructions.

On constate que peu de nouveautés majeures sont présentées par les constructeurs horlogers en relation avec des mécanismes de chronographe. Cela s'explique notamment par le fait que ces mécanismes sont parmi les plus difficiles à mettre au point et, en particulier, ils doivent être parfaitement ajustés pour présenter une qualité d'affichage suffisante pour être mis en oeuvre dans des pièces d'horlogerie de haut de gamme. La plupart des inventions relatives à des mécanismes de chronographe porte d'ailleurs sur des constructions connues et vise à en améliorer le fonctionnement et/ou la fiabilité ou encore à en simplifier la mise au point.We note that few major novelties are presented by watchmakers in relation to chronograph mechanisms. One reason for this is that these mechanisms are among the most difficult to develop and, in particular, they must be perfectly adjusted to provide sufficient display quality. to be implemented in high-end timepieces. Most inventions relating to chronograph mechanisms also relate to known constructions and aims to improve the operation and / or reliability or to simplify the development.

Il y a toutefois un besoin constant de créer des produits innovants dans le domaine horloger, notamment pour séduire les clients en leur proposant des pièces d'horlogerie exclusives et d'utilisation pratique, en particulier dont la lisibilité est bonne.There is however a constant need to create innovative products in the field of watchmaking, in particular to seduce customers by offering them exclusive timepieces and practical use, in particular with readability is good.

Divulgation de l'inventionDisclosure of the invention

Un but principal de la présente invention est de proposer un mécanisme de chronographe du type mentionné plus haut, c'est-à-dire à affichage rétrograde, représentant une avancée technique importante dans le domaine des mécanismes de chronographe par la mise en oeuvre d'une complication rare prenant une forme inédite et permettant d'assurer une bonne lisibilité des informations fournies par la pièce d'horlogerie correspondante.A main object of the present invention is to propose a chronograph mechanism of the type mentioned above, that is to say with a retrograde display, representing an important technical advance in the field of chronograph mechanisms by the implementation of a rare complication taking a novel form and to ensure a good readability of the information provided by the corresponding timepiece.

A cet effet, la présente invention concerne plus particulièrement un mécanisme de chronographe répondant aux caractéristiques mentionnées plus haut, caractérisé par le fait qu'il comporte

  • un mobile de rattrapante destiné à porter un deuxième organe d'affichage de l'unité d'un temps intermédiaire mesuré,
  • un compteur de rattrapante relié au compteur de chronographe par l'intermédiaire d'un dispositif d'indexation débrayable,
  • un dispositif d'entraînement rétrograde du mobile de rattrapante présentant une liaison cinématique avec le compteur de rattrapante et agencé de telle manière que le deuxième organe d'affichage présente un mouvement rétrograde, c'est-à-dire qu'il soit entraîné pour se déplacer suivant un secteur inférieur à 360 degrés, et
  • un dispositif de verrouillage à la demande du compteur de rattrapante pour permettre l'affichage du temps intermédiaire mesuré.
For this purpose, the present invention relates more particularly to a chronograph mechanism corresponding to the characteristics mentioned above, characterized in that it comprises
  • a catch-up mobile intended to carry a second display unit of the unit of a measured intermediate time,
  • a catch-up counter connected to the chronograph counter by means of a disengageable indexing device,
  • a retrograde driving device of the retractable mobile having a kinematic connection with the retrigger counter and arranged in such a way that the second display member has a retrograde movement, that is to say that it is driven to move in an area less than 360 degrees, and
  • a latching device at the request of the split counter to allow the display of the measured lap time.

Les mécanismes de chronographe avec rattrapante sont relativement rares et sont encore plus complexes à mettre au point que les mécanismes de chronographe conventionnels. Typiquement, le mécanisme de rattrapante commande les déplacements d'une aiguille d'affichage des secondes d'un temps intermédiaire mesuré qui est positionnée sous l'aiguille des secondes de chronographe, en étant pivotée au centre du cadran de la pièce d'horlogerie correspondante. La lisibilité de ces montres est souvent réduite étant donné que l'on se retrouve finalement avec quatre aiguilles pivotées au centre, avec celles des minutes et des heures courantes.Split-second chronograph mechanisms are relatively rare and are even more complex to develop than conventional chronograph mechanisms. Typically, the catch-up mechanism controls the movements of a second display hand of a measured intermediate time which is positioned under the second chronograph hand, being pivoted to the center of the dial of the corresponding timepiece. The readability of these watches is often reduced as we finally end up with four hands pivoted in the center, with those of minutes and hours.

Grâce aux caractéristiques de la présente invention, c'est-à-dire la mise en oeuvre d'une aiguille de rattrapante à affichage rétrograde, il devient possible d'associer une telle aiguille à un mécanisme de chronographe rétrograde et de prévoir un secteur d'affichage spécifique pour les temps mesurés. La lisibilité de la pièce d'horlogerie correspondante peut ainsi être améliorée en référence aux pièces d'horlogerie connues. Il est possible d'agencer les deux aiguilles de telle manière qu'elles soient superposées comme c'est le cas habituellement, mais on peut également envisager, en alternative, un secteur d'affichage spécifique pour chacune des aiguilles si l'occupation du cadran par d'autres fonctions de la pièce d'horlogerie le permet.Thanks to the features of the present invention, that is to say the implementation of a retrograde retrograde needle, it becomes possible to associate such a needle to a retrograde chronograph mechanism and to provide a sector of specific display for measured times. The legibility of the corresponding timepiece can thus be improved with reference to known timepieces. It is possible to arrange the two needles in such a way that they are superimposed as is the case usually, but one can also consider, as an alternative, a specific display sector for each of the hands if the occupation of the dial by other functions of the timepiece allows it.

De manière avantageuse, le dispositif d'entraînement rétrograde du mobile de chronographe comprend une came de chronographe entraînée en rotation à partir du compteur de chronographe et associée à une bascule de chronographe portant, d'une part, un palpeur maintenu en appui contre la came de chronographe et, d'autre part, un râteau de chronographe présentant une liaison cinématique avec le mobile de chronographe. De manière similaire, le dispositif d'entraînement rétrograde du mobile de rattrapante comprend une came de rattrapante entraînée en rotation à partir du compteur de rattrapante et associée à une bascule de rattrapante portant, d'une part, un palpeur maintenu en appui contre la came de rattrapante et, d'autre part, un râteau de rattrapante présentant une liaison cinématique avec le mobile de rattrapante.Advantageously, the retrograde drive of the chronograph mobile comprises a chronograph cam rotated from the chronograph counter and associated with a chronograph rocker bearing, on the one hand, a probe held in abutment against the cam chronograph rake and, secondly, a chronograph rake having a kinematic connection with the chronograph mobile. In a similar manner, the retrograde drive device of the retractable wheel comprises a retracting cam driven in rotation from the split-seconds counter and associated with a catch-up flip-flop bearing, on the one hand, a probe held in abutment against the cam. on the other hand, on the other hand, a catch-up rake having a kinematic connection with the split-seconds mobile.

Ces caractéristiques permettent au constructeur horloger de disposer les différents composants du mécanisme quasiment en n'importe quel endroit du mouvement horloger, et lui permettent de prendre en compte les contraintes inhérentes aux autres composants du mouvement avec une grande flexibilité.These characteristics allow the watchmaker to have the various components of the mechanism virtually anywhere in the watch movement, and allow him to take into account the inherent constraints of other motion components with great flexibility.

On peut également prévoir que le compteur de chronographe comprend une première roue de chronographe, le dispositif d'entraînement rétrograde du mobile de chronographe comprenant une deuxième roue de chronographe solidaire en rotation de la came de chronographe, les première et deuxième roues de chronographe étant agencées en prise l'une avec l'autre. De plus, on peut alors prévoir que le compteur de rattrapante comprend une première roue de rattrapante, le dispositif d'entraînement rétrograde du mobile de rattrapante comprenant une deuxième roue de rattrapante agencée pour entraîner en rotation la came de rattrapante, les première et deuxième roues de rattrapante étant agencées en prise l'une avec l'autre.It is also possible that the chronograph counter includes a first chronograph wheel, the retrograde drive of the chronograph mobile comprising a second chronograph wheel rotatably connected to the chronograph cam, the first and second chronograph wheels being arranged engaged with each other. In addition, it is then possible to provide for the split-timer counter to comprise a first split-second wheel, the retrograde-drive device for the split-second mobile comprising a second split-second wheel arranged for rotating the split-second cam, the first and second wheels. catches being arranged in engagement with each other.

Préférablement, la première roue de chronographe et la première roue de rattrapante sont coaxiales.Preferably, the first chronograph wheel and the first catch-up wheel are coaxial.

Dans ce cas, on peut prévoir que le dispositif d'indexation débrayable comporte une came en coeur solidaire de la première roue de chronographe et contre laquelle est maintenu en appui un palpeur porté par un levier monté pivotant sur la première roue de rattrapante.In this case, it can be provided that the indexing device disengageable comprises a core cam integral with the first chronograph wheel and against which is held in support of a probe carried by a lever pivotally mounted on the first split wheel.

De manière similaire, on peut prévoir que la deuxième roue de chronographe et la deuxième roue de rattrapante sont coaxiales.Similarly, it can be expected that the second chronograph wheel and the second split wheel are coaxial.

Dans une variante de réalisation, il est possible de prévoir que la deuxième roue de rattrapante est solidaire en rotation d'une troisième roue de rattrapante elle-même agencée en prise avec un renvoi de rattrapante solidaire en rotation de la came de rattrapante.In an alternative embodiment, it is possible to provide that the second split-second wheel is rotatably connected to a third catch-up wheel itself arranged in engagement with a split-spring return which is integral in rotation with the split-second cam.

Suivant un mode de réalisation préféré de l'invention, on prévoit que le dispositif de verrouillage à la demande du compteur de rattrapante comporte une paire de pinces agencées pour pivoter entre

  • une position verrouillée, dans laquelle les pinces agissent simultanément sur la première roue de rattrapante pour la verrouiller, et
  • une position déverrouillée, dans laquelle les pinces sont situées à distance de la première roue de rattrapante pour laisser cette dernière libre de tourner.
According to a preferred embodiment of the invention, it is provided that the on-demand locking device of the split-timer counter comprises a pair of clamps arranged to pivot between
  • a locked position, in which the tongs act simultaneously on the first split wheel to lock it, and
  • an unlocked position, in which the clamps are located at a distance from the first catch-up wheel to allow the latter to rotate freely.

Dans ce cas, il est avantageux de prévoir en outre que la première roue de rattrapante présente une épaisseur suffisante pour pouvoir coopérer, d'une part, avec les pinces et, d'autre part, avec la deuxième roue de rattrapante dans des plans respectifs superposés. Grâce à cette caractéristique, les petites déformations que la denture de la première roue de rattrapante est susceptible de subir du fait des chocs des pinces ne risquent pas de compromettre la qualité de son engrènement avec la deuxième roue de rattrapante.In this case, it is advantageous to further provide that the first catch-up wheel has a sufficient thickness to be able to cooperate, on the one hand, with the clamps and, on the other hand, with the second catch-up wheel in respective planes. bunk. Thanks to this characteristic, the small deformations that the teeth of the first split-second wheel is likely to suffer due to the shocks of the clamps do not risk compromising the quality of its meshing with the second split-second wheel.

De manière préférée, le compteur de chronographe comprend une came en coeur, de remise à zéro, solidaire en rotation de la première roue de chronographe, le compteur de rattrapante et le dispositif d'entraînement rétrograde du mobile de rattrapante étant agencés de telle manière que la came de rattrapante présente une fréquence de rotation égale au double de la fréquence de rotation de la première roue de chronographe. Dans ce cas, la came de chronographe présente une fréquence de rotation égale à celle de la première roue de chronographe. De plus, la came de rattrapante présente alors préférablement la forme d'un limaçon simple tandis que la came de chronographe présente la forme d'un double limaçon.Preferably, the chronograph counter comprises a heart-shaped, reset cam, integral in rotation with the first chronograph wheel, the split-seconds counter and the retrograde drive device of the second-hand mobile being arranged in such a way that the split-second cam has a rotation frequency equal to twice the rotation frequency of the first chronograph wheel. In this case, the chronograph cam has a rotation frequency equal to that of the first chronograph wheel. In addition, the catch-up cam preferably has the shape of a simple snail while the chronograph cam has the shape of a double snail.

Par ailleurs, suivant une variante de réalisation, on peut également prévoir que le mécanisme comporte un isolateur solidaire de l'une des bascules de chronographe et de rattrapante, et agencé pour agir sur l'autre, de telle manière que leur chute sur les cames, respectivement de chronographe et de rattrapante, soient synchronisées.Furthermore, according to an alternative embodiment, it can also be provided that the mechanism comprises an insulator integral with one of the chronograph and catch-up scales, and arranged to act on the other, such that their fall on the cams , chronograph and rattrapante respectively, are synchronized.

La présente invention concerne également un mouvement horloger muni d'un mécanisme de chronographe répondant aux caractéristiques qui viennent d'être présentées, ainsi qu'une pièce d'horlogerie équipée d'un tel mouvement horloger.The present invention also relates to a watch movement provided with a chronograph mechanism corresponding to the features just presented, as well as a timepiece equipped with such a watch movement.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description détaillée d'un mode de réalisation préféré qui suit, faite en référence aux dessins annexés donnés à titre d'exemples non limitatifs et dans lesquels:

  • la figure 1 représente une vue de face simplifiée d'une partie d'un mouvement horloger, illustré avec son côté cadran visible, comportant un mécanisme de chronographe selon un mode de réalisation préféré de l'invention;
  • la figure 2 représente une vue de face simplifiée d'un premier détail de construction du mouvement horloger de la figure 1, et
  • la figure 3 représente une vue de face simplifiée d'un deuxième détail de construction du mouvement horloger de la figure 1.
Other features and advantages of the present invention will appear more clearly on reading the detailed description of a preferred embodiment which follows, made with reference to the accompanying drawings given by way of non-limiting examples and in which:
  • the figure 1 represents a simplified front view of a part of a watch movement, illustrated with its visible dial side, comprising a chronograph mechanism according to a preferred embodiment of the invention;
  • the figure 2 represents a simplified front view of a first construction detail of the watchmaking movement of the figure 1 , and
  • the figure 3 represents a simplified front view of a second construction detail of the watchmaking movement of the figure 1 .

Mode(s) de réalisation de l'inventionMode (s) of realization of the invention

La figure 1 représente une vue de face simplifiée d'un mouvement horloger 1 comportant un mécanisme de chronographe selon un mode de réalisation préféré de l'invention, le mouvement étant illustré avec son côté cadran visible. La figure 2 représente une vue de face d'un détail de construction du mouvement horloger de la figure 1, tandis que la figure 3 représente une vue de face complémentaire d'un deuxième détail de construction du mouvement horloger de la figure 1 qui n'est pas visible sur les figures 1 et 2.The figure 1 represents a simplified front view of a watch movement 1 comprising a chronograph mechanism according to a preferred embodiment of the invention, the movement being illustrated with its visible dial side. The figure 2 represents a front view of a construction detail of the watch movement of the figure 1 while the figure 3 represents a complementary front view of a second construction detail of the watch movement of the figure 1 which is not visible on figures 1 and 2 .

Le mouvement horloger 1 comprend une platine 2 destinée à supporter les composants du mouvement incluant certains composants du mécanisme de chronographe selon l'invention. Suivant la construction du mouvement, la platine 2 peut également être une platine auxiliaire dédiée au mécanisme de chronographe et, dans ce cas, une platine principale (non représentée) située sous la platine auxiliaire supporterait les autres composants du mouvement.The watch movement 1 comprises a plate 2 intended to support the components of the movement including certain components of the chronograph mechanism according to the invention. According to the construction of the movement, the plate 2 may also be an auxiliary plate dedicated to the chronograph mechanism and, in this case, a main plate (not shown) located under the auxiliary plate would support the other components of the movement.

Le mouvement horloger 1 ne sera pas décrit en détail dans la mesure où beaucoup des éléments qui le composent n'ont pas d'incidence directe sur la mise en oeuvre de la présente invention.The watch movement 1 will not be described in detail since many of the elements that compose it do not have a direct impact on the implementation of the present invention.

Dans le présent mode de réalisation préféré, à titre illustratif non limitatif, le mouvement horloger 1 est du type comportant au moins deux aiguilles (non représentées) d'affichage des heures et des minutes courantes. Ces aiguilles sont ici destinées à être décentrées en direction de la position midi. Par ailleurs, le mouvement horloger 1 est agencé pour commander les déplacements d'une aiguille des secondes de chronographe et d'une aiguille de rattrapante des secondes (représentées sur la figure 3), c'est-à-dire une aiguille destinée à afficher les secondes de temps intermédiaires mesurés. Préférablement, le mouvement horloger 1 est également destiné à entraîner les déplacements d'aiguilles des minutes et des heures de temps mesurés (non représentées). Il comporte une source d'énergie (non visible) destinée à entraîner le déplacement de ces aiguilles par l'intermédiaire notamment d'un rouage de finissage (non visible). Bien entendu, le mouvement horloger 1 peut comporter des complications associées à des organes d'affichage supplémentaires sans sortir du cadre de la présente invention.In the present preferred embodiment, by way of nonlimiting illustration, the watch movement 1 is of the type comprising at least two needles (not shown) for displaying the current hours and minutes. These needles are here intended to be off-center towards the midday position. Moreover, the watch movement 1 is arranged to control the movements of a second chronograph hand and a split second hand (shown on the figure 3 ), that is to say a needle intended to display the measured seconds of intermediate time. Preferably, the watch movement 1 is also intended to cause the movements of hands minutes minutes and hours of time measured (not shown). It comprises a source of energy (not visible) intended to cause the movement of these needles through including a finishing train (not visible). Of course, the watch movement 1 may include complications associated with additional display members without departing from the scope of the present invention.

De manière non limitative, le mouvement horloger 1 est ici destiné à équiper une montre de poche comportant un premier organe de commande 4, de chronographe, à midi et un deuxième organe de commande 6, de rattrapante, à onze heures.In a nonlimiting manner, the watch movement 1 is here intended to equip a pocket watch comprising a first chronograph control member 4 at 12 o'clock and a second control member 6, at 11 o'clock.

Le mécanisme de chronographe illustré ici est du type à monopoussoir, c'est-à-dire que le premier organe de commande 4 permet de commander tous les modes de fonctionnement du mécanisme de chronographe à lui seul, de manière séquentielle, dans l'ordre: marche, arrêt puis remise à zéro. En l'absence d'action sur le deuxième organe de commande 6, l'aiguille de rattrapante présente le même mouvement que l'aiguille des secondes de chronographe.The chronograph mechanism illustrated here is of the monopusher type, that is to say that the first control member 4 makes it possible to control all the operating modes of the chronograph mechanism by itself, sequentially, in the order : On, off and then reset. In the absence of action on the second control member 6, the split-second hand has the same movement as the second chronograph hand.

Dans un premier temps, la partie du mouvement horloger illustré relative au fonctionnement du chronographe de base va être décrite. La partie spécifique au fonctionnement du mécanisme de rattrapante sera décrite dans un deuxième temps.In a first step, the part of the illustrated watch movement relating to the operation of the basic chronograph will be described. The specific operation part of the catch-up mechanism will be described in a second step.

Le mécanisme de chronographe comporte un compteur de chronographe 8, des secondes, agencé ici au centre du mouvement horloger 1. Le compteur de chronographe 8 est susceptible d'être entraîné en rotation à partir d'une roue de moyenne 10 du mouvement horloger, par l'intermédiaire d'un dispositif d'embrayage 12 conventionnel.The chronograph mechanism comprises a chronograph counter 8, seconds, arranged here at the center of the watch movement 1. The chronograph counter 8 is capable of being rotated from an average wheel 10 of the watch movement by via a conventional clutch device 12.

Le dispositif d'embrayage 12 comporte une roue de secondes 14, pivotée sur un pont 16 et solidaire d'un pignon (non visible) de telle manière qu'elle fait un tour sur elle-même en deux minutes. Une roue d'embrayage 18 portée par une bascule d'embrayage 20 est agencée en prise permanente avec la roue de secondes 14. La bascule d'embrayage 20 est susceptible de pivoter entre une position embrayée, dans laquelle la roue d'embrayage 18 engrène également avec une première roue de chronographe 22 du compteur de chronographe 8, et une position débrayée dans laquelle la roue d'embrayage 18 est située hors de portée de la première roue de chronographe 22.The clutch device 12 comprises a seconds wheel 14, pivoted on a bridge 16 and secured to a pinion (not visible) so that it turns on itself in two minutes. A clutch wheel 18 carried by a clutch rocker 20 is arranged in permanent engagement with the seconds wheel 14. The clutch rocker 20 is pivotable between an engaged position, in which the clutch wheel 18 also meshes with a first wheel of Chronograph 22 of the chronograph counter 8, and a disengaged position in which the clutch wheel 18 is located out of reach of the first chronograph wheel 22.

Lorsque la bascule d'embrayage 20 est en position embrayée, la première roue de chronographe 22 est entraînée au rythme d'un tour en deux minutes.When the clutch rocker 20 is in the engaged position, the first chronograph wheel 22 is driven at the rate of one revolution in two minutes.

La première roue de chronographe 22 est agencée en prise permanente avec une deuxième roue de chronographe 24, montée pivotante notamment sur un pont de rétrograde 26 et faisant partie d'un dispositif d'entraînement rétrograde des secondes de chronographe.The first chronograph wheel 22 is arranged in permanent engagement with a second chronograph wheel 24, pivotally mounted in particular on a retrograde bridge 26 and forming part of a retrograde drive device of the chronograph seconds.

La deuxième roue de chronographe 24 est solidaire en rotation d'une came de chronographe 28, en forme de double limaçon.The second chronograph wheel 24 is integral in rotation with a chronograph cam 28, in the form of a double snail.

Une planche additionnelle (non visible) est agencée partiellement en superposition du pont de rétrograde 26, pour assurer le montage de composants du dispositif d'entraînement rétrograde, tel qu'illustré sur la figure 3.An additional board (not visible) is partially arranged in superposition of the retrograde bridge 26, to ensure the assembly of components of the retrograde driving device, as illustrated in FIG. figure 3 .

Une bascule de chronographe 30 est agencée en rotation sur la planche additionnelle, celle-ci comprenant un palpeur 32 destiné à être agencé en appui contre la périphérie de la came de chronographe 28 et un râteau denté 34. Ce dernier est agencé en prise avec un mobile de chronographe 36, coaxial au compteur de chronographe 8 et destiné à porter une aiguille 38 des secondes de temps mesurés.A chronograph scale 30 is arranged in rotation on the additional plate, the latter comprising a feeler 32 intended to be arranged in abutment against the periphery of the chronograph cam 28 and a toothed rake 34. The latter is arranged in engagement with a mobile chronograph 36, coaxial with the chronograph counter 8 and intended to carry a needle 38 seconds of measured time.

Grâce à cette construction, lorsque le dispositif d'embrayage 12 est en configuration embrayée, la rotation de la roue de moyenne 10 est transmise à la deuxième roue de chronographe 24, et donc à la came de chronographe 28 qui tourne à raison d'un tour complet en deux minutes.Thanks to this construction, when the clutch device 12 is in the engaged configuration, the rotation of the average wheel 10 is transmitted to the second chronograph wheel 24, and therefore to the chronograph cam 28 which rotates at a rate of complete turn in two minutes.

Un secteur gradué des secondes de temps mesurés 40 est schématisé sur la figure 3, celui-ci s'étendant sur un angle de 140 degrés, à titre illustratif non limitatif. La forme de la came de chronographe 28 et la démultiplication entre le râteau de chronographe 34 et le mobile de chronographe 36 sont telles que l'aiguille de chronographe 38 parcourt un angle de 140 degrés lorsque la came de chronographe 28 fait un demi-tour, soit une fois toutes les minutes. Ensuite, le palpeur 32 tombe sur la portion de la came de chronographe 28 présentant le plus petit rayon et l'aiguille de chronographe 38 revient à sa position initiale, avant de recommencer le même mouvement tant que la mesure d'un temps est en cours.A sector graduated from the measured seconds of time 40 is schematized on the figure 3 , this latter extending over an angle of 140 degrees, by way of nonlimiting illustration. The shape of the chronograph cam 28 and the multiplication between the chronograph rake 34 and the chronograph mobile 36 are such that the chronograph hand 38 travels at a 140 degree angle when the chronograph cam 28 turns half a turn, ie once every minute. Then, the feeler 32 falls on the portion of the chronograph cam 28 having the smallest radius and the chronograph hand 38 returns to its initial position, before repeating the same movement as long as the measurement of a time is in progress .

Un organe élastique de rappel (non illustré) est prévu pour agir sur la bascule de chronographe 30 et maintenir son palpeur 32 en appui contre la périphérie de la came de chronographe 28.An elastic return member (not shown) is provided to act on the chronograph rocker 30 and maintain its probe 32 bearing against the periphery of the chronograph cam 28.

Dans le même temps, le mécanisme de chronographe assure également l'entraînement d'un compteur des minutes de chronographe 42, de manière conventionnelle. Le mécanisme de chronographe comporte à cet effet deux doigts d'entraînement 44, diamétralement opposés et solidaires en rotation de la première roue de chronographe 22, ces doigts étant destinés à faire avancer d'un pas un renvoi des minutes 46 à chaque fois que le mobile de chronographe 36 parcourt un angle de 140 degrés, soit une fois par minute. Le renvoi des minutes 46 entraîne à son tour une roue 48 du compteur des minutes 42 une fois par minute.At the same time, the chronograph mechanism also drives a chronograph minute counter 42 in a conventional manner. The chronograph mechanism comprises for this purpose two drive fingers 44, diametrically opposed and integral in rotation with the first chronograph wheel 22, these fingers being intended to advance a step forward a minute 46 each time the Mobile Chronograph 36 travels at an angle of 140 degrees, ie once a minute. The return of the minutes 46 in turn causes a wheel 48 of the minute counter 42 once per minute.

Par ailleurs, le compteur de chronographe 8 comporte également une came en coeur 49 de remise à zéro conventionnelle, solidaire de la première roue de chronographe 22.Furthermore, the chronograph counter 8 also comprises a conventional reset cam 49, integral with the first chronograph wheel 22.

En ce qui concerne l'actionnement du mécanisme de chronographe, le premier organe de commande 4 coopère avec une roue à colonnes 50 à trois temps pour la faire pivoter et passer d'un mode de fonctionnement à l'autre. Les colonnes de la roue à colonnes 50 coopèrent, de manière conventionnelle, avec un bec 51 de la bascule d'embrayage 20, avec un frein 52 du compteur de chronographe 8 et avec un marteau de remise à zéro 54. Ce dernier comprend des premier et second bras 56, 58 agencés pour agir respectivement sur le compteur des secondes 8 et sur le compteur des minutes 42. Des organes élastiques de rappel sont prévus, de manière connue, pour agir sur ces différents composants et tendre à les repousser dans leur position par défaut. De même, des sautoirs sont prévus pour assurer le maintien des positions angulaires de la roue à colonnes 50 et du compteur de minutes 42, lorsque c'est nécessaire.As regards the actuation of the chronograph mechanism, the first control member 4 cooperates with a three-cycle column wheel 50 to rotate it and move from one mode of operation to another. The columns of the column wheel 50 conventionally cooperate with a spout 51 of the clutch rocker 20, with a brake 52 of the chronograph counter 8 and with a reset hammer 54. The latter comprises first and second arms 56, 58 arranged to act respectively on the seconds counter 8 and on the minutes counter 42. Elastic return members are provided, in known manner, to act on these various components and tend to push them back into their position. by default. Similarly, jumpers are provided for maintain the angular positions of the column wheel 50 and the minute counter 42, when necessary.

La structure et le fonctionnement du mécanisme de rattrapante vont à présent être décrits.The structure and operation of the catch-up mechanism will now be described.

Le mécanisme de rattrapante comporte un compteur de rattrapante comprenant une première roue de rattrapante 60 coaxiale à la première roue de chronographe 22. Il comporte par ailleurs un dispositif d'indexation débrayable agencé entre les premières roues de chronographe et de rattrapante, de telle manière que la position angulaire de la première roue de rattrapante 60 puisse être indexée sur celle de la première roue de chronographe 22 lorsque c'est nécessaire.The catch-up mechanism comprises a split-seconds counter comprising a first split-second wheel 60 coaxial with the first chronograph wheel 22. It furthermore comprises a disengageable indexing device arranged between the first chronograph and split-seconds wheels, in such a way that the angular position of the first catch-up wheel 60 can be indexed to that of the first chronograph wheel 22 when necessary.

Plus précisément, ce dispositif d'indexation débrayable comprend, de manière conventionnelle, une came en coeur (non visible) solidaire de la première roue de chronographe 22 et un levier 62 monté pivotant sur la première roue de rattrapante 60, le levier 62 présentant un palpeur (non visible, ou un galet, en alternative) maintenu en appui contre la périphérie de la came en coeur sous l'effet de l'action d'un ressort 64 également porté par la première roue de rattrapante 60.More specifically, this disengageable indexing device comprises, in a conventional manner, a core cam (not visible) integral with the first chronograph wheel 22 and a lever 62 pivotally mounted on the first split-second wheel 60, the lever 62 having a probe (not visible, or a roller, alternatively) held in abutment against the periphery of the cam in the heart under the effect of the action of a spring 64 also carried by the first wheel of split-seconds 60.

Ainsi, lorsque la mesure d'un temps est en cours, la première roue de rattrapante 60 suit la première roue de chronographe 22.Thus, when the measurement of a time is in progress, the first split-second wheel 60 follows the first chronograph wheel 22.

Une paire de pinces 66 de rattrapante conventionnelle est prévue pour verrouiller la première roue de rattrapante 60 lorsque la lecture d'un temps mesuré intermédiaire est demandée par l'utilisateur. Les pinces 66 sont mobiles entre une position verrouillée, dans laquelle elles sont agencées en appui contre la denture de la première roue de rattrapante 60, et une position déverrouillée dans laquelle elles laissent la première roue de rattrapante 60 libre de tourner.A pair of conventional splitters 66 are provided for locking the first split-second wheel 60 when the reading of an intermediate measured time is requested by the user. The clamps 66 are movable between a locked position, in which they are arranged in abutment against the toothing of the first split wheel 60, and an unlocked position in which they leave the first split wheel 60 free to rotate.

Les pinces 66 sont commandées en synchronisation, de manière connue, par une roue à colonnes 68 de rattrapante agencée pour être entraînée en rotation, pas à pas, par le deuxième organe de commande 6, pour changer l'état des pinces, en alternance.The clamps 66 are controlled in synchronization, in a known manner, by a retreating column wheel 68 arranged to be driven in rotation, step by step, by the second control member 6, to change the condition of the clamps, alternately.

Par ailleurs, la première roue de rattrapante 60 présente une liaison cinématique permanente avec un dispositif d'entraînement rétrograde de rattrapante, en engrenant avec une deuxième roue de rattrapante 70.Moreover, the first split-second wheel 60 has a permanent kinematic connection with a retrograde counter-clockwise driving device, meshing with a second split-second wheel 70.

On notera que, de manière avantageuse, l'épaisseur de la première roue de rattrapante 60 est telle que, d'une part, les pinces 66 et, d'autre part, la deuxième roue de rattrapante 70 coopèrent avec elle à des niveaux différents de sa denture, dans des plans respectifs superposés. Ainsi, quand bien même une partie de la denture de la première roue de rattrapante 60 serait endommagée à force de chocs répétés des pinces, cela ne pourrait pas perturber le fonctionnement du mécanisme étant donné que la transmission entre les première et deuxième roues de rattrapante intervient avec une partie de la denture qui n'entre jamais en contact avec les pinces.It will be noted that, advantageously, the thickness of the first split-second wheel 60 is such that, on the one hand, the grippers 66 and, on the other hand, the second catch-up wheel 70 cooperate with it at different levels. of his teeth, in respective superimposed planes. Thus, even if a portion of the teeth of the first split-second wheel 60 would be damaged by repeated impacts of the tongs, this could not disturb the operation of the mechanism since the transmission between the first and second split-seconds wheels intervenes. with a part of the toothing that never comes into contact with the clamps.

La deuxième roue de rattrapante 70 est coaxiale à la deuxième roue de chronographe 24 et est solidaire en rotation d'une troisième roue de rattrapante 72, également coaxiale, mais de diamètre inférieur.The second split-second wheel 70 is coaxial with the second chronograph wheel 24 and is rotatably connected to a third split-second wheel 72, which is also coaxial, but of smaller diameter.

Comme cela ressort de la figure 3, la troisième roue de rattrapante 72 est agencée en prise avec un renvoi de rattrapante 74 solidaire en rotation d'une came de rattrapante 76 en forme de limaçon simple. Les rapports entre les deuxième et troisième roues de rattrapante et le renvoi de rattrapante sont tels que la came de rattrapante 76 effectue un tour complet sur elle-même en une minute.As is apparent from the figure 3 , the third catch-up wheel 72 is arranged in engagement with a catch-up return 74 integral in rotation with a split snail cam 76 in the shape of a simple snail. The ratios between the second and third split-seconds wheels and the split-back gear are such that the split-second cam 76 performs a complete turn on itself in one minute.

Une bascule de rattrapante 78 est agencée en rotation sur la planche additionnelle, celle-ci comprenant un palpeur 80 destiné à être agencé en appui contre la périphérie de la came de rattrapante 76 et un râteau denté 82. Ce dernier est agencé en prise avec un mobile de rattrapante 84, coaxial au compteur de chronographe 8 et destiné à porter une aiguille 86 des secondes de temps intermédiaires mesurés, appelée rattrapante.A split-seconds rocker 78 is arranged in rotation on the additional plate, the latter comprising a feeler 80 intended to be arranged in abutment against the periphery of the split-second cam 76 and a toothed rake 82. The latter is arranged in engagement with a rattrapante mobile 84, coaxial with the chronograph counter 8 and intended to carry a needle 86 seconds measured intermediate seconds, called catch-up.

Grâce à cette construction, lorsque le dispositif d'embrayage 12 est en configuration embrayée, la rotation de la roue de moyenne 10 est transmise à la deuxième roue de rattrapante 70, et donc à la came de rattrapante 76 qui tourne à raison d'un tour complet en une minute.By virtue of this construction, when the clutch device 12 is in the engaged configuration, the rotation of the average wheel 10 is transmitted to the second ratchet wheel 70, and therefore to the ratchet cam 76 which rotates at a speed of complete turn in one minute.

Un secteur gradué des secondes de temps intermédiaires mesurés 88 est schématisé sur la figure 3, celui-ci s'étendant sur un angle de 140 degrés en étant opposé au secteur gradué 40 des secondes de temps mesurés, à titre illustratif non limitatif. La forme de la came de rattrapante 76 et la démultiplication entre le râteau de rattrapante 82 et le mobile de rattrapante 84 sont telles que l'aiguille de rattrapante 86 parcourt un angle de 140 degrés lorsque la came de rattrapante 76 fait un tour complet, soit une fois toutes les minutes. Ensuite, le palpeur 80 tombe sur la portion de la came de rattrapante 76 présentant le plus petit rayon et l'aiguille de rattrapante 86 revient à sa position initiale, avant de recommencer le même mouvement tant que la mesure d'un temps est en cours.A graduated sector of measured intermediate time seconds 88 is schematized on the figure 3 , this extending over an angle of 140 degrees being opposite to the graduated sector 40 seconds of time measured, by way of non-limiting illustration. The shape of the split-second cam 76 and the reduction ratio between the split-second rake 82 and the split-seconds wheel 84 are such that the split-second needle 86 travels at a 140-degree angle when the split-second cam 76 makes a complete turn, either once every minute. Then, the probe 80 falls on the portion of the splitter cam 76 having the smallest radius and the split-second needle 86 returns to its initial position, before repeating the same movement as long as the measurement of a time is in progress .

Un organe élastique de rappel (non illustré) est prévu pour agir sur la bascule de rattrapante 78 et maintenir son palpeur 80 en appui contre la périphérie de la came de rattrapante 76.An elastic return member (not shown) is provided to act on the catch-up latch 78 and maintain its feeler 80 bearing against the periphery of the split-second cam 76.

Cette construction permet d'obtenir un fonctionnement de l'aiguille de rattrapante similaire à celui des mécanismes horlogers connus, à la différence qu'elle présente ici un mouvement rétrograde. En particulier, lorsque les pinces 66 sont dans leur position déverrouillée, l'aiguille de rattrapante 86 présente des déplacements similaires à ceux de l'aiguille de chronographe 38 dans tous les modes de fonctionnement du mécanisme de chronographe (marche, arrêt, remise à zéro), alors qu'elle reste immobile dans tous les modes de fonctionnement lorsque les pinces sont dans leur position de verrouillage.This construction makes it possible to obtain an operation of the split-second needle similar to that of the known clock-making mechanisms, with the difference that it presents a retrograde movement here. In particular, when the grippers 66 are in their unlocked position, the split-second needle 86 has displacements similar to those of the chronograph hand 38 in all operating modes of the chronograph mechanism (on, off, reset). ), while it remains stationary in all modes of operation when the clamps are in their locking position.

L'aiguille de rattrapante 86 peut indifféremment être agencée pour se déplacer en regard du même secteur gradué que l'aiguille des secondes de chronographe 38 ou, en alternative, sur un secteur qui lui est spécifique comme illustré sur la figure 3.The split-second needle 86 may be arranged to move opposite the same graduated sector as the second chronograph hand 38 or, alternatively, on a sector which is specific to it as illustrated in FIG. figure 3 .

De manière avantageuse, on peut prévoir un isolateur 90 entre les bascules de chronographe 30 et de rattrapante 78, présentant ici la forme d'un ressort courbe dont une extrémité est solidaire de la bascule de chronographe 30 et l'autre extrémité est agencée en appui contre une goupille 92 portée par la bascule de rattrapante 78. Cet isolateur 90 permet d'assurer une synchronisation parfaite entre les deux bascules lors de leur chute sur les cames correspondantes. Plus précisément, la bascule de chronographe 30 retient la bascule de rattrapante 78 tant qu'elle n'est pas tombée. Ça n'est qu'au moment de sa chute que l'isolateur 90 libère la bascule de rattrapante 78 et lui permet aussi de tomber sur la portion de la came de rattrapante 76 de rayon le plus faible.Advantageously, an isolator 90 can be provided between the chronograph and catcheswitch latch 78, here having the form of a curved spring whose one end is integral with the chronograph rocker 30 and the other end is arranged in support against a pin 92 carried by the latch rocker 78. This isolator 90 ensures a perfect synchronization between the two latches when they fall on the corresponding cams. Specifically, the chronograph rocker 30 retains the latch rocker 78 until it has fallen. It is only at the moment of its fall that the insulator 90 releases the catch-up latch 78 and also allows it to fall on the portion of the split-second cam 76 of the weakest radius.

Grâce aux caractéristiques qui ont été exposées, une pièce d'horlogerie présentant un affichage original de chronographe peut être réalisée, non seulement celui-ci étant de type rétrograde, mais en plus il est associé à un affichage des temps intermédiaires également de type rétrograde.Thanks to the characteristics that have been exposed, a timepiece having an original chronograph display can be made, not only the latter being retrograde type, but in addition it is associated with a display of intermediate times also retrograde type.

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 oeuvre de certaines caractéristiques particulières qui viennent d'être décrites, comme par exemple le nombre de roues et/ou de renvois décrits dans les rouages de chronographe et de rattrapante. En effet, il est possible de prévoir des rouages différents qui permettraient éventuellement de disposer les affichages de chronographe et de rattrapante en d'autres endroits du cadran de la pièce d'horlogerie correspondante, sans sortir du cadre de l'invention, que ces affichages soient ou non superposés.The foregoing description attempts to describe a particular embodiment by way of non-limiting illustration and the invention is not limited to the implementation of certain particular features which have just been described, for example the number of wheels and / or referrals described in the chronograph and splitwheel workings. Indeed, it is possible to provide different wheels that could possibly have the chronograph displays and catches in other parts of the dial of the corresponding timepiece, without departing from the scope of the invention, these displays whether or not they are superimposed.

En alternative à la mise en oeuvre d'une différence de fréquence de rotation entre la première roue de chronographe 22 et la came de rattrapante 76, il est possible de prévoir que le palpeur 80 de la bascule de rattrapante 78 soit muni d'une sécurité pour lui permettre de s'escamoter si la remise à zéro du chronographe devait entraîner une rotation de la came de rattrapante 76 dans le sens anti-horaire sur la vue de la figure 3.As an alternative to implementing a rotation frequency difference between the first chronograph wheel 22 and the split-second cam 76, it is possible to provide that the feeler 80 of the split-seconds rocker 78 is provided with a safety device. to allow it to retract if the reset chronograph was to cause a rotation of the split cam 76 in the counterclockwise direction on the view of the figure 3 .

L'homme du métier ne rencontrera pas de difficulté particulière pour adapter le contenu de la présente divulgation à ses propres besoins et, mettre en oeuvre une pièce d'horlogerie ne répondant qu'en partie aux caractéristiques décrites mais comportant un mécanisme de chronographe agencé pour entraîner des aiguilles de chronographe et de rattrapante de manière rétrograde, sans sortir du cadre de l'invention.The person skilled in the art will not encounter any particular difficulty in adapting the content of the present disclosure to his own needs and implementing a timepiece that only partly satisfies the characteristics described but including a chronograph mechanism arranged to to drive retrograde chronograph and retrograde hands, without departing from the scope of the invention.

Le présent enseignement pourra également être adapté pour prévoir l'entraînement d'un organe d'affichage associé à une unité de temps autre que la seconde sans sortir du cadre de l'invention.The present teaching may also be adapted to provide the drive of a display member associated with a unit of time other than the second without departing from the scope of the invention.

Claims (16)

  1. A retrograde chronograph mechanism, for a clockwork movement (1), intended to provide, on demand, the driving of a first display organ (38) by a unit of a measured time, preferably by seconds of a measured time, such that the display organ (38) has a retrograde movement, i.e., such that it is driven to move along a sector smaller than 360 degrees, the mechanism including
    a chronograph counter (8),
    a coupling device (12) intended to establish, on demand, a connection between said chronograph counter (8) and a driving wheel (10) of the clockwork movement (1),
    a chronograph wheel (36) intended to carry the first display organ (38),
    a retrograde driving device of said chronograph wheel (36) having a kinematic link with said chronograph counter (8),
    a split-time wheel (84) intended to carry a second display organ (86) for said unit of a measured intermediate time,
    a split-time counter connected to said chronograph counter (8) via a disengageable indexing device (62, 64),
    a retrograde driving device for said split-time wheel (84) having a kinematic link with said split-time counter and arranged such that the second display organ (86) has a retrograde movement, i.e., it is driven to move over a sector smaller than 360 degrees, and
    a locking device (66, 68) upon demand of said split-time counter, to allow the display of the measured intermediate time.
  2. The mechanism according to claim 1, characterized
    in that said retrograde driving device of said chronograph wheel (36) comprises a chronograph cam (28) rotated from said chronograph counter (8) and associated with a chronograph lever (30) carrying, on the one hand, a feeler-spindle (32) kept bearing against said chronograph cam (28) and, on the other hand, a chronograph rack (34) having a kinematic link with the chronograph wheel (36), and
    in that said retrograde driving device of said split-time wheel (84) comprises a split-time cam (76) rotated from said split-time counter and associated with a split-time lever (78) bearing, on the one hand, a feeler-spindle (80) kept bearing against said split-time cam (76) and, on the other hand, a split-time rack (82) having a kinematic link with the split-time wheel (84).
  3. The mechanism according to claim 2, characterized
    in that said chronograph counter (8) comprises a first chronograph wheel (22), said retrograde driving device of said chronograph wheel (36) comprising a second chronograph wheel (24) secured in rotation with said chronograph cam (28), said first and second chronograph wheels (22, 24) being arranged engaged with one another, and
    in that said split-time counter comprises a first split-time wheel (60), said retrograde driving device of said split-time wheel (84) comprising a second split-time wheel (70) arranged to rotate said split-time cam (76), said first and second split-time wheels (60, 70) being arranged engaged with one another.
  4. The mechanism according to claim 3, characterized in that said first chronograph wheel (22) and first split-time wheel (60) are coaxial.
  5. The mechanism according to claim 4, characterized in that said disengageable indexing device includes a heart-shaped cam secured to said first chronograph wheel (22) and against which a feeler-spindle is kept bearing that is supported by a lever (62) mounted pivoting on said first split-time wheel (60).
  6. The mechanism according to one of claims 3 to 5, characterized in that said second chronograph wheel (24) and said second split-time wheel (70) are coaxial.
  7. The display mechanism according to one of claims 3 to 6, characterized in that said second split-time wheel (70) is secured in rotation with a third split-time wheel (72), which in turn is arranged engaged with a split-time setting-wheel (74) secured in rotation with said split-time cam (76).
  8. The mechanism according to one of claims 3 to 7, characterized
    in that said device for locking said split-time counter on demand includes a pair of pliers (66) arranged to pivot between
    a locked position, in which said pliers (66) act simultaneously on said first split-time wheel (60) to lock it, and
    an unlocked position, in which said pliers (66) are located at a distance from said first split-time wheel (60) to allow the latter to rotate, and
    in that said first split-time wheel (60) has a sufficient thickness to be able to cooperate, on the one hand, with said pliers (66) and, on the other hand, with said second split-time wheel (70) in respective superimposed planes.
  9. The mechanism according to one of claims 3 to 8, said chronograph counter (8) comprising a heart-shaped cam (49) for resetting, secured in rotation with said first chronograph wheel (22), characterized in that said split-time counter and said retrograde driving device of said split-time wheel (84) are arranged such that said split-time cam (76) has a rotation frequency equal to twice the rotation frequency of said first chronograph wheel (22), said chronograph cam (28) having a rotation frequency equal to that of said first chronograph wheel (22).
  10. The mechanism according to claim 9, characterized in that said split-time cam (76) exhibits the shape of a single snail while said chronograph cam (28) exhibits the shape of a double snail.
  11. The mechanism according to one of claims 2 to 10, characterized in that it includes an isolator (90) secured to one of said chronograph and split-time levers (30, 78) and arranged to act on the other such that their falls on said cams, respectively chronograph and split-time (28, 76), are synchronized.
  12. The mechanism according to one of claims 1 to 11, characterized in that the second display organ (86) is arranged to move with respect to a same graduated sector as the first display organ (38).
  13. The mechanism according to one of claims 1 to 11, characterized in that the second display organ (86) and the first display organ (38) move with respect to separate graduated sectors.
  14. A clockwork movement (1) including a chronograph mechanism according to one of the preceding claims.
  15. The clockwork movement (1) according to claim 14, when said chronograph (36) and split-time (84) wheels are intended to allow the display of the seconds of a measured time, respectively of an intermediate measured time, characterized in that said driving wheel includes a third wheel (10) arranged engaged with a seconds wheel (14) performing a turn around itself in two minutes and arranged to be kinematically connected to said first chronograph wheel (22), on demand, via said coupling device (12).
  16. A timepiece housing a clockwork movement (1) according to claim 14 or 15 arranged to drive, on demand, a first display organ (38) for a unit of a measured time as well as a second display organ (86) of this same unit of an intermediate measured time.
EP16177230.6A 2015-07-01 2016-06-30 Retrograde chronograph mechanism with rattrapante hand Active EP3112956B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00950/15A CH711317A2 (en) 2015-07-01 2015-07-01 Chronograph mechanism with retrograde rattrapante.

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EP3112956A1 EP3112956A1 (en) 2017-01-04
EP3112956B1 true EP3112956B1 (en) 2018-08-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3486735B1 (en) 2017-11-20 2020-09-30 Montres Breguet S.A. Second reset clock mechanism with snail cam
EP3540522B1 (en) * 2018-03-13 2020-10-28 Harry Winston SA Retrograde display mechanism for a timepiece
EP4307052A1 (en) * 2022-07-14 2024-01-17 Manufacture d'Horlogerie Audemars Piguet SA Chronograph mechanism for a clockwork

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Publication number Priority date Publication date Assignee Title
FR701884A (en) * 1930-09-11 1931-03-24 Device for measuring time differences
CH696713A5 (en) 1999-01-28 2007-10-15 Patek Philippe Sa mechanical chronograph.
DE10135110B4 (en) * 2001-07-19 2004-05-27 Lange Uhren Gmbh Chronograph
CH704948B1 (en) 2004-02-17 2012-11-30 Lvmh Swiss Mft Sa Watch electromechanical chronograph retrograde.
CH703008A1 (en) * 2010-04-23 2011-10-31 Francois-Regis Richard Mechanism chronographe, clock and movement timepiece including such mechanism.
EP2485102A1 (en) * 2011-02-02 2012-08-08 Patek Philippe SA Genève Display device
CH704696B1 (en) * 2011-03-25 2016-10-31 Chronode Sa Timepiece including a retrograde display mechanism.
EP2824517A3 (en) * 2013-07-12 2016-06-01 Rolex Sa Clockwork mechanism, clock movement and timepiece

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