EP3032358A1 - Chronograph mechanism for a clock movement - Google Patents

Chronograph mechanism for a clock movement Download PDF

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Publication number
EP3032358A1
EP3032358A1 EP14197810.6A EP14197810A EP3032358A1 EP 3032358 A1 EP3032358 A1 EP 3032358A1 EP 14197810 A EP14197810 A EP 14197810A EP 3032358 A1 EP3032358 A1 EP 3032358A1
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EP
European Patent Office
Prior art keywords
wheel
mobile
chronograph
driven
driving
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
EP14197810.6A
Other languages
German (de)
French (fr)
Other versions
EP3032358B1 (en
Inventor
Vincent Jolion
Mario Jose Vides de Oliveira
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.)
Richemont International SA
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Richemont International SA
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Priority to EP14197810.6A priority Critical patent/EP3032358B1/en
Publication of EP3032358A1 publication Critical patent/EP3032358A1/en
Application granted granted Critical
Publication of EP3032358B1 publication Critical patent/EP3032358B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • G04F7/0823—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement
    • G04F7/0828—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement acting in the plane of the movement
    • 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
    • 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
    • G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms
    • G04F7/0809—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms with single hammers, i.e. one hammer acts on each counter
    • 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
    • G04F7/0823—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement
    • G04F7/0833—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement acting perpendicular to the plane of the movement
    • 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
    • G04F7/0823—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement
    • G04F7/0838—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement involving a tilting movement

Definitions

  • the present invention relates to a chronograph mechanism, for a watch movement, comprising a driving mobile capable of being rotated by a driving wheel for driving on demand a mobile driven via a mobile transmission, the drive wheel itself being intended to be driven from a power source of the watch movement, the driven mobile being intended to control the movements of a display member, each mobile driving, driving, transmission and driven having a shaft integral with a first wheel.
  • a difficulty recognized in the design of these mechanisms lies in the development of a clutch device allowing in particular to limit as much as possible a jump of the chronograph hand when setting into operation the measurement of 'a time, as explained on pages 234-235 of the work cited above.
  • a jump of the chronograph hand when setting into operation the measurement of 'a time, as explained on pages 234-235 of the work cited above.
  • the presence of such a set of gear requires the establishment of a friction spring on the mobile seconds chronograph to avoid a kinking of the corresponding display needle.
  • triangular profile teeth are generally provided on these two wheels to attempt to address the problems just mentioned, but such a tooth profile results in poor transmission of forces between these wheels.
  • a main object of the present invention is to propose an alternative construction of a chronograph mechanism of the type which has just been described, presenting few modifications with reference to known constructions, while using conventional type components, but allowing at least partly to address the above problems.
  • the present invention relates more particularly to a chronograph mechanism of the type mentioned above, characterized in that at least one of the driving, transmission and driven mobiles comprises a second wheel frictionally mounted on the shaft. corresponding and arranged to cooperate with the first wheel of another mobile among the driving mobiles, driving, transmission and led.
  • the second wheel can rotate freely on its shaft when the value of the torque to be transmitted exceeds a predefined value.
  • the implementation of the above features, in connection with a conventional construction chronograph gear clutch device at least partially solves the problems mentioned above. Indeed, for example, in the case of a conventional chronograph mechanism in which reset hammers are pressed on the heart cams of the stop chronograph mobiles, it is necessary to synchronize perfectly the passage of the clutch from its disengaged state to its engaged state with the lifting of the hammers releasing the chronograph mobiles.
  • the mobile mounted on the clutch rocker here plays the role of mobile transmission between a wheel field and mobile seconds chronograph.
  • the introduction of a wheel frictionally mounted on its shaft in the chronograph train makes it possible to lift the hammers only after the change of position of the clutch and to avoid especially the jump of the second chronograph hand when starting the measurement of a time. Any discrepancy between the teeth of the wheels of the clutch and the chronograph mobile is thus caught up by the friction, without impact on the position of the display needle.
  • the second wheel can be frictionally mounted on the shaft of the transmission wheel and be arranged to cooperate with the first wheel of the driven wheel, while the first wheel of the transmission wheel is arranged. to cooperate with the first wheel of the moving mobile.
  • the second wheel can be frictionally mounted on the shaft of the clutch mobile to cooperate with the wheel of the mobile chronograph seconds, while the first wheel (conventional) mobile clutch cooperates with the wheel on fields.
  • the second wheel is mounted frictionally on the shaft of the driven mobile and is arranged to cooperate with the wheel of the transmission mobile while the first wheel of the driven mobile is intended to control the movements of a display member.
  • the second wheel can be mounted frictionally on the mobile shaft of the second chronograph being arranged to cooperate with the wheel of the clutch mobile, the latter cooperating itself with the wheel on fields, in a conventional way.
  • the reset hammers fall on the heart cams carried by chronograph mobiles seconds, minutes and possibly hours, to rotate quickly and reposition the display members in their rest position.
  • the minute chronograph mobile is generally driven by jumps from the chronograph mobile seconds when measuring a time. This training is typically performed by a finger arranged in such a way that it can retract during the reset, if necessary.
  • the construction according to the present invention makes it possible, for example, to implement a simplified construction for driving the minute chronograph mobile, having a kinematic connection, from a driving mobile, in which is involved a wheel mounted rubbing on his tree.
  • the mobile minute chronograph can be driven from the mobile center of the watch movement which is associated with the chronograph mechanism according to the invention.
  • the mobile center performs the role of mobile leading to the mobile chronograph minutes, it advantageously leads via a mobile transmission comprising an intermediate mobile.
  • the intermediate mobile or mobile minutes of chronograph then advantageously comprises a wheel frictionally mounted on its shaft.
  • the mobile driving the drive of the mobile chronograph minutes can be a mobile seconds chronograph, this training being performed via an intermediate mobile comprising a shaft to be pivotally mounted on the corresponding watch movement and carrying a wheel friction assembly.
  • the first and second wheels may advantageously each have a toothing having an NIHS 20-25 toothing profile.
  • This profile conventional in the workings other than those of the chronograph mechanisms, ensures better performance than the triangular profiles generally used in particular between the clutch wheel and the wheel of the mobile seconds chronograph.
  • the use of such a tooth profile avoids a clogging of the second display needle of the measured times without having to use the conventional friction spring.
  • the second wheel (frictionally assembled on its shaft) and the first wheel with which it cooperates each have a micro-module toothing.
  • the first wheels associated with wheels other than the second wheel preferably each have a small module toothing.
  • the present invention also relates to a chronograph mechanism having the characteristics mentioned above and comprising a core cam intended to be integral in rotation with the display member, a reset hammer having a suitable surface for cooperating with the core cam, a brake for, in the operating position, maintaining fixed the angular position of a wheel of the mobile driven integral with the cam in the heart, a clutch rocker carrying the transmission mobile, and a column wheel intended to cooperate with the hammer, the brake and the clutch rocker, to actuate them according to different modes of START, STOP, RESET operation of the chronograph mechanism.
  • the hammer, the clutch rocker and the column wheel are shaped and arranged in such a way that, when the START mode is engaged, the hammer is lifted from the cam. heart just after the clutch rocker is actuated by the column wheel to place it in its engaged state.
  • the brake, the clutch rocker and the column wheel are shaped and arranged in such a way that, when the STOP mode is engaged, the brake acts on the wheel of the driven wheel, to maintain its fixed angular position, before the actuation of the clutch rocker by the column wheel to place it in its disengaged state.
  • the present invention also relates to a watch movement comprising a chronograph mechanism exhibiting the characteristics which have just been exhibited, as well as a timepiece equipped with such a watch movement.
  • the figures 1 , 2 and 3 represent a same view from above of a part of a watch movement 1 comprising a chronograph mechanism according to a preferred embodiment of the present invention, the latter being visible by its bridges side in first, second and third states of respective operation. More specifically, the figure 1 illustrates the chronograph mechanism in its rest state after resetting (RESET operating mode), the figure 2 illustrates this mechanism during the measurement of a time (START mode of operation) and, the figure 3 illustrates this mechanism after stopping the measurement of a time, before resetting its counters (STOP function mode).
  • the figures 1 , 2 and 3 illustrate, in a simplified manner, the main elements of the chronograph mechanism for driving conventional display elements, namely chronograph seconds hands and chronograph minutes (not visible).
  • This movement 1 comprises frame elements including a bridge 2, on which are mounted mobiles, levers, latches and other clock components, of which only those related to the chronograph mechanism are illustrated and will be described in detail in this presentation . These components could be mounted on a plate, alternatively, without departing from the scope of the invention.
  • the chronograph mechanism includes chronograph counters 10 (or chronograph seconds counter) and minutes 20.
  • Each of these counters comprises a mobile (whose wheel 11, 21 is visible) intended to be driven in connection with a time base (that of the finishing train or a time base specific to the chronograph) and is arranged to drive in rotation a measured time display member (not shown).
  • the mobile minute counter 20 also includes a second wheel 23 which is frictionally mounted on the shaft of this mobile, the role of which will be explained below.
  • Each counter also comprises a core cam 12, 22, each cam being integral in rotation with the corresponding display member and intended to cooperate with a suitable surface of a corresponding reset hammer 14, 24.
  • the chronograph mechanism illustrated here by way of non-limiting example is of the type comprising a column wheel 30.
  • the latter can be rotated on itself by a hook 32, integral with a control 34 whose pivoting can be controlled, conventionally, from a pusher 35.
  • the chronograph mechanism illustrated and described in this example is of the three-stroke single-pusher type, in other words a complete operating cycle corresponds to three steps of the column wheel 30.
  • each pressure on the pusher 35 causes a rotation of one step of the column wheel 30, successively passing the chronograph function from a state at rest (RESET mode) to a measurement state of a time (START mode), the state of measurement of a time (START mode) to a stopped state (STOP mode) or from the stopped state (STOP mode) to the idle state (RESET mode).
  • the alternation of solids (columns) and empty acts on different latches to activate or deactivate functions relating to the measurement of time intervals.
  • the column wheel cooperates in particular with a clutch rocker 36, carrying a clutch mobile 38 and pivotally mounted on the frame between a first position, resting or disengaged, and a second position, driving or engaged.
  • the clutch rocker 36 is arranged here to establish or interrupt a kinematic connection in the chronograph wheel, and to allow the driving of driven mobiles, here the chronograph counters 10 and 20, from a finishing train (no represented), by means of a mobile moving, here a wheel of seconds 40 commonly called wheel over fields with respect to the counter 10, and by either a center mobile (not visible) or the chronograph wheel 11 for Regarding the counter 20.
  • the clutch mobile acts as a transmission mobile between the mobile and at least one driven mobile.
  • the driving mobile is here driven by a drive wheel (not visible), itself driven from a power source of the watch movement, possibly via a finishing train.
  • the mobile minute counter 20 is, in this embodiment, driven by the center mobile (or minutes) of the watch movement, via an intermediate mobile 42 which meshes permanently with the wheel 23 of the 20.
  • the minute counter 20 can be instead driven, still via an intermediate mobile 142, from the seconds counter 10 when the latter is engaged with the clutch mobile 38.
  • it is the mobile 142 and not the mobile 20 which comprises a wheel frictionally mounted on the shaft of the mobile.
  • the column wheel 30 also cooperates with brakes 44 and 46 whose function is, typically, to maintain fixed the angular position, respectively, of the chronograph wheel 11 and the wheel of the minute counter 21, when the measurement of a time is interrupted before resetting.
  • the column wheel 30 is arranged to cooperate with the reset reset hammer 14, while the latter cooperates itself with the reset hammer minutes 24 via a first nozzle 48, so that both hammers are synchronized.
  • the seconds hammer 14 comprises a second spout 50 cooperating or not with the columns of the column wheel 30 to define the angular position of the hammer.
  • the hammers are capable of moving, in a conventional manner, between a rest position, in which each of them bears against the core cam with which it is associated, and a raised position, in which each of them is remote from the core cam with which it is associated to let the corresponding wheel 11, 21 free to turn and measure a time.
  • the figure 1 illustrates the watch movement while the chronograph mechanism is in its idle state (RESET mode).
  • the hammers 14 and 24 are positioned in abutment against the core cams 12, 22 to keep the display members of the measured times immobile, in their position corresponding to the measurement of a zero time.
  • the brakes 44 and 46 are here preferably positioned at a distance from the wheels 11 and 21.
  • the brakes could also be positioned in abutment against the wheels 11 and 21, in this state, without departing from the scope of this invention.
  • the clutch lever 36 is positioned in its disengaged position, bearing on a column of the column wheel 30, in such a way that the kinematic connection between the field wheel 40 and the chronograph wheel 11 is not established, the clutch mobile 38 not meshing with the chronograph wheel 11 in this configuration.
  • the friction wheel 23 of the mobile minute counter 20 meshes permanently with a wheel of the intermediate mobile 42, while the other wheel of the intermediate mobile 42 meshes with the mobile center of the watch movement. Since the hammer 24 acting against the core 22 keeps the wheel 21 of the minute counter 20 at the zero position, there is a disengagement between the wheels 21 and 23 thanks to the friction of the wheel 23, and the wheel 21 remains stationary.
  • Pressing on the pusher 35 rotates the column wheel 30 by one step, via the control 34, to position it in its configuration shown in FIG. figure 2 , corresponding to the measurement of a time (START mode).
  • the clutch mobile 38 then enters into engagement with the chronograph wheel 11.
  • the hammers 14 and 24 are raised, just after the fall of the rocker, by a column of the column wheel 30, to release the chronograph counters wheels seconds 11 and minutes 21.
  • the brakes 44 and 46 remain in their support on the same columns as in the rest configuration to stay away from the chronograph wheels 11 and 21.
  • the clutch mobile 38 acts as a transmission mobile between the field wheel 40 and the chronograph wheel 11. No longer being blocked by the hammer 24, acting against the heart 22, the wheel minutes of chronograph 21 engages with the wheel 23 so that the wheel 21 is driven by the mobile center of the watch movement, through the mobile 42 also fulfilling the role of a mobile transmission.
  • the hammer 14 remains resting on the same column as in the previous phase, while the brakes 44 and 46 are released, before the rise of the rocker 36, by shifting the columns on which they had previously rested, and can fall on the chronograph wheels of seconds 11 and minutes 21 to lock in their respective positions, under the effect of the action of their respective springs 58 and 60.
  • the figure 4 illustrates a simplified perspective view of a first construction detail of the chronograph wheel which has just been described.
  • FIG 4 illustrates more clearly the mode of cooperation between the leading, transmission and driven mobiles, that is to say between the field wheel 40, the clutch mobile 38 and the chronograph wheel 11.
  • the clutch mobile, or transmission comprises a first wheel 68 arranged in permanent engagement with the field wheel 40, in a conventional manner.
  • the present invention provides the arrangement of a wheel frictionally mounted on its shaft in the chronograph wheel.
  • This wheel is here a second wheel 70 frictionally mounted on the shaft 72 of the clutch mobile 38.
  • a bridge 73 is integral with the clutch rocker 36 to ensure pivotal mounting of the shaft 72.
  • the toothing of the second wheel 70 then engages in the toothing of the chronograph wheel 11 with a combined movement of translation and rotation.
  • the clutch rocker 36, the hammers 14, 24 and the columns of the column wheel 30 are preferably shaped and arranged in such a way that the hammers 14, 24 are still bearing against the core cams 12, 22 at the moment when the toothing of the second wheel 70 engages in the toothing of the chronograph wheel 11.
  • the shapes of the spout 50 and columns of the column wheel 30 are adapted to ensure a lifting of the hammer 14 of the cam 12 as soon as the toothing of the second wheel 70 is engaged in that of the wheel 11. The measurement of a time can then start.
  • the assembly of the second wheel 70 on the shaft 72 can be made in any known manner and adapted and the skilled person will not encounter any particular difficulty to implement it.
  • the skilled person can draw inspiration from the teaching of the patent CH 701075 B1 to achieve this assembly.
  • the clutch mobile has only one wheel 68, the second wheel 70 being in this case frictionally assembled on the shaft of the chronograph mobile 10 being arranged to mesh with the In this case, the second wheel 70 would slide on the shaft of the mobile 10 during the fall of the clutch lever 36, while the chronograph wheel 11 would be blocked by the hammer 14, to avoid a jump of the corresponding needle.
  • the wheel field 40 would be driven by the watch movement but it is the second wheel 70 which would be arranged in permanent engagement with the single wheel 68 of the clutch mobile 38, or alternatively with the drive wheel .
  • the figure 5 illustrates an example of an alternative construction of the chronograph wheel of Figures 1 to 3 , allowing to highlight an alternative approach to ensure the training of the minute counter.
  • the minute counter 20 no longer has a friction wheel and the entire mobile is driven, via an intermediate mobile 142, from the seconds counter 10 when the latter is engaged with the clutch mobile 38 .
  • the method of driving the minute counter 20 from the seconds counter 10 via a finger can be replaced by a gear, including a wheel fitted with friction on its shaft and having a better accuracy.
  • the intermediate mobile 142 comprises first and second wheels 74 and 76, the first 74 is integral with the shaft 78 of the mobile 142, while the second 76 is frictionally mounted on the shaft 78.
  • the first wheel 74 is here arranged in permanent engagement with a reference 80 secured to the shaft 82 of the mobile counter seconds 10.
  • the movement of the second mobile 10 is transmitted to the mobile of minutes 20 by the intermediate mobile 142, which makes it possible to obtain a display trailing timed minutes, in contrast to jumping retractable finger mechanisms.
  • the second wheel 76 begins to slide on its shaft 78 as soon as the seconds and minutes mobiles 20 are driven in a non-synchronized way by their respective hammers.
  • the moving mobile is the mobile seconds chronograph 10 whose movements are transmitted to the mobile minutes of chronographs 20, playing the role of mobile led through the intermediate mobile 142 acting as a mobile transmission .
  • the wheel frictionally mounted on the shaft of the intermediate mobile 142 is that which meshes with the mobile of the seconds 10 or that which meshes with the mobile of the minutes 20 without departing from the scope of the 'invention.
  • the wheels 74 and 76 are both integral with the axis 78 but that the wheel frictionally mounted on its shaft is the return 80 of the mobile seconds 10.
  • the wheels of the chronograph train according to the present invention may advantageously each have a toothing having an NIHS tooth profile 20-25 or other warhead gear with good transmission efficiency.
  • This profile conventional in the workings other than those of the chronograph mechanisms, ensures better performance than the triangular profiles generally used in particular between the clutch wheel and the wheel of the mobile seconds chronograph.
  • the use of such a tooth profile makes it possible to avoid the needling of the needle display of the measured time seconds without having to use the conventional friction spring.
  • the wheel frictionally mounted on its shaft and the wheel with which it cooperates each have a micro-module toothing, while the other wheels preferably each have a small module toothing.

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

Abstract

La présente invention concerne un mécanisme de chronographe, pour mouvement horloger (1), comportant un mobile menant susceptible d'être entraîné en rotation par un mobile d'entraînement pour assurer l'entraînement à la demande d'un mobile mené (10, 20) par l'intermédiaire d'un mobile de transmission (38, 42, 142), le mobile mené (10, 20) étant destiné à contrôler les déplacements d'un organe d'affichage, chacun des mobiles d'entraînement, menant, de transmission (38, 42, 142) et mené (10, 20) comportant un arbre (72, 78, 82) solidaire d'une première roue (11, 40, 68). L'un au moins parmi les mobiles menant, de transmission (38, 42, 142) et mené (10, 20) comporte une deuxième roue (70, 76) montée à friction sur l'arbre (72, 78) correspondant et agencée pour coopérer avec la première roue (11, 21) d'un autre mobile (10, 20) parmi les mobiles d'entraînement, menant, de transmission (38, 42, 142) et mené (10, 20).The present invention relates to a chronograph mechanism, for a watch movement (1), comprising a driving mobile capable of being rotated by a driving wheel for driving on demand a driven wheel (10, 20). ) via a transmission wheel (38, 42, 142), the driven wheel (10, 20) being for controlling the movements of a display member, each driving wheel, driving, transmission (38, 42, 142) and driven (10, 20) having a shaft (72, 78, 82) integral with a first wheel (11, 40, 68). At least one of the driving, transmitting (38, 42, 142) and driven (10, 20) mobiles comprises a second wheel (70, 76) frictionally mounted on the corresponding shaft (72, 78) and arranged to cooperate with the first wheel (11, 21) of another mobile (10, 20) among the drive, driving, transmission (38, 42, 142) and driven (10, 20).

Description

Domaine techniqueTechnical area

La présente invention concerne un mécanisme de chronographe, pour mouvement horloger, comportant un mobile menant susceptible d'être entraîné en rotation par un mobile d'entraînement pour assurer l'entraînement à la demande d'un mobile mené par l'intermédiaire d'un mobile de transmission, le mobile d'entraînement étant lui-même destiné à être entraîné à partir d'une source d'énergie du mouvement horloger, le mobile mené étant destiné à contrôler les déplacements d'un organe d'affichage, chacun des mobiles d'entraînement, menant, de transmission et mené comportant un arbre solidaire d'une première roue.The present invention relates to a chronograph mechanism, for a watch movement, comprising a driving mobile capable of being rotated by a driving wheel for driving on demand a mobile driven via a mobile transmission, the drive wheel itself being intended to be driven from a power source of the watch movement, the driven mobile being intended to control the movements of a display member, each mobile driving, driving, transmission and driven having a shaft integral with a first wheel.

Etat de la techniqueState of the art

Des mécanismes de chronographe comprenant des rouages de ce type sont bien connus dans le domaine de l'horlogerie. Un exemple conventionnel est présenté dans l'ouvrage intitulé " Théorie d'horlogerie", de C.-A. Reymondin et al., édité par la Fédération des Ecoles Techniques (Suisse), ISBN 2-940025-10-X, notamment des pages 232 à 237 .Chronograph mechanisms including gear wheels of this type are well known in the field of watchmaking. A conventional example is presented in the book entitled " Theory of Clocks ", by C.-A.Reymondin et al., Published by the Federation of Technical Schools (Switzerland), ISBN 2-940025-10-X, especially pages 232-237 .

Ces mécanismes de chronographe présentent un grand nombre de composants mobiles interagissant les uns avec les autres et leur mise au point est très complexe.These chronograph mechanisms have a large number of mobile components interacting with each other and their development is very complex.

En particulier, une difficulté reconnue dans la conception de ces mécanismes réside dans la mise au point d'un dispositif d'embrayage permettant notamment de limiter autant que possible un saut de l'aiguille de chronographe lors de la mise en fonction de la mesure d'un temps, comme expliqué aux pages 234-235 de l'ouvrage cité ci-dessus. Pour limiter l'amplitude de ce saut, il est courant de prévoir un jeu d'engrenage important entre la roue de l'embrayage et la roue du compteur des secondes de chronographe avec laquelle elle engrène. Toutefois, la présence d'un tel jeu d'engrenage nécessite la mise en place d'un ressort de friction sur le mobile des secondes de chronographe pour éviter un chevrotement de l'aiguille d'affichage correspondante. En outre, des dentures de profil triangulaire sont généralement prévues sur ces deux roues pour tenter de répondre aux problèmes qui viennent d'être mentionnés, mais un tel profil de denture résulte en une transmission médiocre des forces entre ces roues. Ces solutions connues présentent notamment un impact défavorable sur la marche du mouvement horloger.In particular, a difficulty recognized in the design of these mechanisms lies in the development of a clutch device allowing in particular to limit as much as possible a jump of the chronograph hand when setting into operation the measurement of 'a time, as explained on pages 234-235 of the work cited above. To limit the amplitude of this jump, it is common to provide a large set of gear between the wheel of the clutch and the chronograph seconds counter wheel with which it meshes. However, the presence of such a set of gear requires the establishment of a friction spring on the mobile seconds chronograph to avoid a kinking of the corresponding display needle. In addition, triangular profile teeth are generally provided on these two wheels to attempt to address the problems just mentioned, but such a tooth profile results in poor transmission of forces between these wheels. These known solutions in particular have an adverse impact on the progress of the watch movement.

D'autres solutions ont été proposées, soit par la mise en oeuvre de profils de dentures particuliers, comme par exemple dans le brevet EP 1437633 B1 , soit par la mise en oeuvre de constructions différentes du dispositif d'embrayage, comme par exemple dans la demande de brevet EP 2112564 A1 , qui présente une construction complexe comportant un engrenage différentiel.Other solutions have been proposed, either by the implementation of particular tooth profiles, as for example in the patent EP 1437633 B1 or by implementing different constructions of the clutch device, as for example in the patent application EP 2112564 A1 which has a complex construction with a differential gear.

Ces solutions alternatives, non conventionnelles, sont complexes et coûteuses. Ainsi, le besoin existe toujours de trouver une approche alternative pour la réalisation d'un mécanisme de chronographe qui soit simple à mettre en oeuvre et permettant de répondre au moins en partie à au moins certains des problèmes mentionnés plus haut.These alternative, unconventional solutions are complex and expensive. Thus, there is still a need to find an alternative approach for producing a chronograph mechanism that is simple to implement and that at least partially addresses at least some of the problems mentioned above.

Divulgation de l'inventionDisclosure of the invention

Un but principal de la présente invention est de proposer une construction alternative d'un mécanisme de chronographe du type qui vient d'être décrit, présentant peu de modifications en référence aux constructions connues, tout en utilisant des composants de type conventionnel, mais permettant de répondre au moins en partie aux problèmes précités.A main object of the present invention is to propose an alternative construction of a chronograph mechanism of the type which has just been described, presenting few modifications with reference to known constructions, while using conventional type components, but allowing at least partly to address the above problems.

A cet effet, la présente invention concerne plus particulièrement un mécanisme de chronographe du type mentionné plus haut, caractérisé par le fait que l'un au moins parmi les mobiles menant, de transmission et mené comporte une deuxième roue montée à friction sur l'arbre correspondant et agencée pour coopérer avec la première roue d'un autre mobile parmi les mobiles d'entraînement, menant, de transmission et mené.To this end, the present invention relates more particularly to a chronograph mechanism of the type mentioned above, characterized in that at least one of the driving, transmission and driven mobiles comprises a second wheel frictionally mounted on the shaft. corresponding and arranged to cooperate with the first wheel of another mobile among the driving mobiles, driving, transmission and led.

Grâce à ces caractéristiques, la deuxième roue peut tourner librement sur son arbre lorsque la valeur du couple à transmettre dépasse une valeur prédéfinie.Thanks to these characteristics, the second wheel can rotate freely on its shaft when the value of the torque to be transmitted exceeds a predefined value.

Une telle éventualité peut intervenir essentiellement dans deux cas de figure dans le rouage de chronographe, de manière non limitative.Such an eventuality can occur essentially in two cases in the chronograph wheel, in a non-limiting way.

D'une part, la mise en oeuvre des caractéristiques ci-dessus, en relation avec un dispositif d'embrayage de rouage de chronographe de construction conventionnelle, permet de résoudre au moins partiellement les problèmes mentionnés plus haut. En effet, à titre d'exemple, dans le cas d'un mécanisme de chronographe conventionnel dans lequel des marteaux de remise à zéro sont appuyés sur des cames en coeur des mobiles de chronographe à l'arrêt, il est nécessaire de synchroniser parfaitement le passage de l'embrayage de son état débrayé vers son état embrayé avec la levée des marteaux libérant les mobiles de chronographe. Le mobile monté sur la bascule d'embrayage joue ici le rôle de mobile de transmission entre une roue sur champs et le mobile des secondes de chronographe. Dans ce cas, la mise en place d'une roue montée à friction sur son arbre dans le rouage de chronographe, selon la présente invention, permet de ne soulever les marteaux qu'après le changement de position de l'embrayage et d'éviter notamment le saut de l'aiguille de chronographe des secondes lors du démarrage de la mesure d'un temps. Un éventuel décalage entre les dentures des roues de l'embrayage et du mobile de chronographe est ainsi rattrapé par la friction, sans impact sur la position de l'aiguille d'affichage.On the one hand, the implementation of the above features, in connection with a conventional construction chronograph gear clutch device, at least partially solves the problems mentioned above. Indeed, for example, in the case of a conventional chronograph mechanism in which reset hammers are pressed on the heart cams of the stop chronograph mobiles, it is necessary to synchronize perfectly the passage of the clutch from its disengaged state to its engaged state with the lifting of the hammers releasing the chronograph mobiles. The mobile mounted on the clutch rocker here plays the role of mobile transmission between a wheel field and mobile seconds chronograph. In this case, the introduction of a wheel frictionally mounted on its shaft in the chronograph train, according to the present invention, makes it possible to lift the hammers only after the change of position of the clutch and to avoid especially the jump of the second chronograph hand when starting the measurement of a time. Any discrepancy between the teeth of the wheels of the clutch and the chronograph mobile is thus caught up by the friction, without impact on the position of the display needle.

Ainsi, on notera que, de manière générale, la deuxième roue peut être montée à friction sur l'arbre du mobile de transmission et être agencée pour coopérer avec la première roue du mobile mené, tandis que la première roue du mobile de transmission est agencée pour coopérer avec la première roue du mobile menant.Thus, it will be noted that, in general, the second wheel can be frictionally mounted on the shaft of the transmission wheel and be arranged to cooperate with the first wheel of the driven wheel, while the first wheel of the transmission wheel is arranged. to cooperate with the first wheel of the moving mobile.

Autrement dit, pour revenir au cas particulier évoqué précédemment, la deuxième roue peut être montée à friction sur l'arbre du mobile d'embrayage pour coopérer avec la roue du mobile des secondes de chronographe, tandis que la première roue (conventionnelle) du mobile d'embrayage coopère avec la roue sur champs.In other words, to return to the particular case mentioned above, the second wheel can be frictionally mounted on the shaft of the clutch mobile to cooperate with the wheel of the mobile chronograph seconds, while the first wheel (conventional) mobile clutch cooperates with the wheel on fields.

Il est également possible de prévoir, en alternative, que la deuxième roue est montée à friction sur l'arbre du mobile mené et est agencée pour coopérer avec la roue du mobile de transmission tandis que la première roue du mobile mené est destinée à contrôler les déplacements d'un organe d'affichage.It is also possible to provide, alternatively, that the second wheel is mounted frictionally on the shaft of the driven mobile and is arranged to cooperate with the wheel of the transmission mobile while the first wheel of the driven mobile is intended to control the movements of a display member.

Autrement dit, pour revenir au cas particulier évoqué précédemment, la deuxième roue peut être montée à friction sur l'arbre du mobile des secondes de chronographe en étant agencée pour coopérer avec la roue du mobile d'embrayage, cette dernière coopérant elle-même avec la roue sur champs, de manière conventionnelle.In other words, to return to the particular case mentioned above, the second wheel can be mounted frictionally on the mobile shaft of the second chronograph being arranged to cooperate with the wheel of the clutch mobile, the latter cooperating itself with the wheel on fields, in a conventional way.

D'autre part, il peut être souhaitable de découpler un mobile du reste du rouage de chronographe lors de la remise à zéro du temps mesuré. En effet, lors de cette opération, les marteaux de remise à zéro chutent sur les cames en coeur portées par les mobiles de chronographe des secondes, des minutes et éventuellement des heures, pour les faire tourner rapidement et repositionner les organes d'affichage dans leur position de repos. Outre le fait que les mobiles tournent rapidement, ils ne tournent pas forcément tous dans le même sens, d'où la nécessité de découpler certains mobiles les uns des autres. En particulier, le mobile de chronographe des minutes est généralement entraîné par sauts à partir du mobile de chronographe des secondes lors de la mesure d'un temps. Cet entraînement est typiquement réalisé par un doigt agencé de telle manière qu'il peut s'escamoter lors de la remise à zéro, en cas de besoin. Ainsi, la construction selon la présente invention permet par exemple de mettre en oeuvre une construction simplifiée pour assurer l'entraînement du mobile de chronographe des minutes, présentant une liaison cinématique, à partir d'un mobile menant, dans laquelle est impliquée une roue montée à friction sur son arbre.On the other hand, it may be desirable to decouple a mobile from the rest of the chronograph train during the resetting of the measured time. Indeed, during this operation, the reset hammers fall on the heart cams carried by chronograph mobiles seconds, minutes and possibly hours, to rotate quickly and reposition the display members in their rest position. In addition to the fact that mobiles turn quickly, they do not necessarily all turn in the same direction, hence the need to decouple some mobiles from each other. In particular, the minute chronograph mobile is generally driven by jumps from the chronograph mobile seconds when measuring a time. This training is typically performed by a finger arranged in such a way that it can retract during the reset, if necessary. Thus, the construction according to the present invention makes it possible, for example, to implement a simplified construction for driving the minute chronograph mobile, having a kinematic connection, from a driving mobile, in which is involved a wheel mounted rubbing on his tree.

Suivant un mode de réalisation préféré, le mobile des minutes de chronographe peut être entraîné à partir du mobile de centre du mouvement horloger auquel est associé le mécanisme de chronographe selon l'invention. Dans ce cas, le mobile de centre remplit le rôle de mobile menant pour le mobile des minutes de chronographe, qu'il entraîne avantageusement par l'intermédiaire d'un mobile de transmission comportant un mobile intermédiaire. Le mobile intermédiaire ou le mobile des minutes de chronographe comporte alors avantageusement une roue montée à friction sur son arbre.According to a preferred embodiment, the mobile minute chronograph can be driven from the mobile center of the watch movement which is associated with the chronograph mechanism according to the invention. In this case, the mobile center performs the role of mobile leading to the mobile chronograph minutes, it advantageously leads via a mobile transmission comprising an intermediate mobile. The intermediate mobile or mobile minutes of chronograph then advantageously comprises a wheel frictionally mounted on its shaft.

En alternative, le mobile menant assurant l'entraînement du mobile des minutes de chronographe peut être un mobile des secondes de chronographe, cet entraînement étant réalisé via un mobile intermédiaire comprenant un arbre destiné à être monté pivotant sur le mouvement horloger correspondant et portant une roue assemblée à friction.Alternatively, the mobile driving the drive of the mobile chronograph minutes can be a mobile seconds chronograph, this training being performed via an intermediate mobile comprising a shaft to be pivotally mounted on the corresponding watch movement and carrying a wheel friction assembly.

De manière générale, les premières et deuxième roues peuvent avantageusement présenter chacune une denture présentant un profil de denture NIHS 20-25. Ce profil, conventionnel dans les rouages autres que ceux des mécanismes de chronographe, permet d'assurer un meilleur rendement que les profils triangulaires généralement utilisés notamment entre la roue d'embrayage et la roue du mobile des secondes de chronographe. En outre, l'utilisation d'un tel profil de denture permet d'éviter un chevrotement de l'aiguille d'affichage des secondes des temps mesurés sans avoir à utiliser le conventionnel ressort de friction.In general, the first and second wheels may advantageously each have a toothing having an NIHS 20-25 toothing profile. This profile, conventional in the workings other than those of the chronograph mechanisms, ensures better performance than the triangular profiles generally used in particular between the clutch wheel and the wheel of the mobile seconds chronograph. In addition, the use of such a tooth profile avoids a clogging of the second display needle of the measured times without having to use the conventional friction spring.

De manière préférée, la deuxième roue (assemblée à friction sur son arbre) et la première roue avec laquelle elle coopère présentent chacune une denture à micro-module. De plus, les premières roues associées à des roues autres que la deuxième roue présentent préférablement chacune une denture à petit module.Preferably, the second wheel (frictionally assembled on its shaft) and the first wheel with which it cooperates each have a micro-module toothing. In addition, the first wheels associated with wheels other than the second wheel preferably each have a small module toothing.

Par ailleurs, la présente invention concerne également un mécanisme de chronographe répondant aux caractéristiques mentionnées ci-dessus et comprenant
une came en coeur destinée à être solidaire en rotation de l'organe d'affichage,
un marteau de remise à zéro ayant une surface adaptée destinée à coopérer avec la came en coeur,
un frein pour, en position de service, maintenir fixe la position angulaire d'une roue du mobile mené solidaire de la came en coeur,
une bascule d'embrayage portant le mobile de transmission, et
une roue à colonnes destinée à coopérer avec le marteau, le frein et la bascule d'embrayage, pour les actionner selon différents modes de fonctionnement START, STOP, RESET du mécanisme de chronographe. Selon un mode de réalisation préféré de l'invention, le marteau, la bascule d'embrayage et la roue à colonnes sont conformés et agencés de telle manière que, lors de l'enclenchement du mode START, le marteau se soulève de la came en coeur juste après l'actionnement de la bascule d'embrayage par la roue à colonnes visant à la placer dans son état embrayé.Furthermore, the present invention also relates to a chronograph mechanism having the characteristics mentioned above and comprising
a core cam intended to be integral in rotation with the display member,
a reset hammer having a suitable surface for cooperating with the core cam,
a brake for, in the operating position, maintaining fixed the angular position of a wheel of the mobile driven integral with the cam in the heart,
a clutch rocker carrying the transmission mobile, and
a column wheel intended to cooperate with the hammer, the brake and the clutch rocker, to actuate them according to different modes of START, STOP, RESET operation of the chronograph mechanism. According to a preferred embodiment of the invention, the hammer, the clutch rocker and the column wheel are shaped and arranged in such a way that, when the START mode is engaged, the hammer is lifted from the cam. heart just after the clutch rocker is actuated by the column wheel to place it in its engaged state.

En outre, on peut alors avantageusement prévoir que le frein, la bascule d'embrayage et la roue à colonnes sont conformés et agencés de telle manière que, lors de l'enclenchement du mode STOP, le frein agit sur la roue du mobile mené, pour maintenir sa position angulaire fixe, avant l'actionnement de la bascule d'embrayage par la roue à colonnes visant à la placer dans son état débrayé.In addition, it can then advantageously be provided that the brake, the clutch rocker and the column wheel are shaped and arranged in such a way that, when the STOP mode is engaged, the brake acts on the wheel of the driven wheel, to maintain its fixed angular position, before the actuation of the clutch rocker by the column wheel to place it in its disengaged state.

La présente invention concerne également un mouvement horloger comportant un mécanisme de chronographe présentant les caractéristiques qui viennent d'être exposées, ainsi qu'une pièce d'horlogerie munie d'un tel mouvement horloger.The present invention also relates to a watch movement comprising a chronograph mechanism exhibiting the characteristics which have just been exhibited, 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: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:

- la figure 1 représente une vue de face simplifiée d'un mécanisme de chronographe selon un mode de réalisation préféré de l'invention, dans un premier état de fonctionnement;

  • la figure 2 représente une vue de face simplifiée du mécanisme de la figure 1, dans un deuxième état de fonctionnement;
  • la figure 3 représente une vue de face simplifiée du mécanisme de la figure 1, dans un troisième état de fonctionnement;
  • la figure 4 représente une vue en perspective simplifiée d'un premier détail de construction du mécanisme de la figure 1, et
  • la figure 5 représente une vue en perspective simplifiée d'un deuxième détail de construction du mécanisme de la figure 1.
- the figure 1 represents a simplified front view of a chronograph mechanism according to a preferred embodiment of the invention, in a first operating state;
  • the figure 2 represents a simplified front view of the mechanism of the figure 1 in a second operating state;
  • the figure 3 represents a simplified front view of the mechanism of the figure 1 in a third operating state;
  • the figure 4 represents a simplified perspective view of a first construction detail of the mechanism of the figure 1 , and
  • the figure 5 represents a simplified perspective view of a second construction detail of the mechanism of the figure 1 .

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

Les figures 1, 2 et 3 représentent une même vue de dessus d'une partie d'un mouvement horloger 1 comportant un mécanisme de chronographe selon un mode de réalisation préféré de la présente invention, celui-ci étant visible par son côté ponts dans des premier, deuxième et troisième états de fonctionnement respectifs. Plus précisément, la figure 1 illustre le mécanisme de chronographe dans son état au repos après remise à zéro (mode de fonctionnement RESET), la figure 2 illustre ce mécanisme pendant la mesure d'un temps (mode de fonctionnement START) et, la figure 3 illustre ce mécanisme après arrêt de la mesure d'un temps, avant remise à zéro de ses compteurs (mode de fonction STOP).The figures 1 , 2 and 3 represent a same view from above of a part of a watch movement 1 comprising a chronograph mechanism according to a preferred embodiment of the present invention, the latter being visible by its bridges side in first, second and third states of respective operation. More specifically, the figure 1 illustrates the chronograph mechanism in its rest state after resetting (RESET operating mode), the figure 2 illustrates this mechanism during the measurement of a time (START mode of operation) and, the figure 3 illustrates this mechanism after stopping the measurement of a time, before resetting its counters (STOP function mode).

Les figures 1, 2 et 3 illustrent, de manière simplifiée, les éléments principaux du mécanisme de chronographe permettant d'assurer l'entraînement d'organes d'affichage conventionnels, à savoir des aiguilles des secondes de chronographe et des minutes de chronographe (non visibles).The figures 1 , 2 and 3 illustrate, in a simplified manner, the main elements of the chronograph mechanism for driving conventional display elements, namely chronograph seconds hands and chronograph minutes (not visible).

Il est évident que ce mouvement est représenté à titre illustratif non limitatif et, que l'homme du métier pourra mettre en oeuvre l'objet de la présente invention en l'adaptant à un mécanisme de chronographe de construction alternative sans sortir du cadre de l'invention. En particulier, on notera que la structure générale de ce mécanisme de chronographe est ici proche de celle mentionnée plus haut au titre d'art antérieur, pour illustrer le fait que la mise en oeuvre de la présente invention ne nécessite d'apporter que peu de modifications aux mécanismes existants, sans pour autant remettre en question l'avancée importante qu'elle représente.It is obvious that this movement is represented by way of nonlimiting illustration and that the skilled person can implement the object of the present invention by adapting it to a chronograph mechanism of alternative construction without departing from the scope of the present invention. 'invention. In particular, it will be noted that the general structure of this chronograph mechanism is here close to that mentioned above in the prior art, to illustrate the fact that the implementation of the present invention requires only a few modifications to existing mechanisms, without calling into question the important progress it represents.

Ce mouvement 1 comporte des éléments de bâti dont notamment un pont 2, sur lequel sont montés des mobiles, leviers, bascules et autres composants horlogers, dont seuls ceux en rapport avec le mécanisme de chronographe sont illustrés et seront décrits en détail dans le présent exposé. Ces composants pourraient être montés sur une platine, en alternative, sans sortir du cadre de l'invention.This movement 1 comprises frame elements including a bridge 2, on which are mounted mobiles, levers, latches and other clock components, of which only those related to the chronograph mechanism are illustrated and will be described in detail in this presentation . These components could be mounted on a plate, alternatively, without departing from the scope of the invention.

Le mécanisme de chronographe comporte des compteurs de chronographe 10 (ou compteur des secondes de chronographe) et de minutes 20.The chronograph mechanism includes chronograph counters 10 (or chronograph seconds counter) and minutes 20.

Chacun de ces compteurs comprend un mobile (dont la roue 11, 21 est visible) destiné à être entraîné en relation avec une base de temps (celle du rouage de finissage ou une base de temps propre au chronographe) et est agencé pour entraîner en rotation un organe d'affichage de temps mesurés (non représenté). De plus, dans cette forme d'exécution, le mobile compteur des minutes 20 comprend également une deuxième roue 23 qui est montée à friction sur l'arbre de ce mobile, le rôle de laquelle sera expliqué ci-dessous.Each of these counters comprises a mobile (whose wheel 11, 21 is visible) intended to be driven in connection with a time base (that of the finishing train or a time base specific to the chronograph) and is arranged to drive in rotation a measured time display member (not shown). In addition, in this embodiment, the mobile minute counter 20 also includes a second wheel 23 which is frictionally mounted on the shaft of this mobile, the role of which will be explained below.

Chaque compteur comporte également une came en coeur 12, 22, chaque came étant solidaire en rotation de l'organe d'affichage correspondant et destinée à coopérer avec une surface adaptée d'un marteau de remise à zéro correspondant 14, 24.Each counter also comprises a core cam 12, 22, each cam being integral in rotation with the corresponding display member and intended to cooperate with a suitable surface of a corresponding reset hammer 14, 24.

Le mécanisme de chronographe illustré ici à titre d'exemple non limitatif est du type comportant une roue à colonnes 30. Cette dernière peut être entraînée en rotation sur elle-même par un crochet 32, solidaire d'une commande 34 dont le pivotement peut être commandé, de manière conventionnelle, à partir d'un poussoir 35.The chronograph mechanism illustrated here by way of non-limiting example is of the type comprising a column wheel 30. The latter can be rotated on itself by a hook 32, integral with a control 34 whose pivoting can be controlled, conventionally, from a pusher 35.

Plus précisément, le mécanisme de chronographe illustré et décrit dans cet exemple est du type à mono-poussoir à trois temps, autrement dit un cycle complet de fonctionnement correspond à trois pas de la roue à colonnes 30. En effet, chaque pression sur le poussoir 35 entraîne une rotation d'un pas de la roue à colonnes 30, faisant passer successivement la fonction chronographe d'un état au repos (mode RESET) à un état de mesure d'un temps (mode START), de l'état de mesure d'un temps (mode START) à un état arrêté (mode STOP) ou de l'état arrêté (mode STOP) à l'état au repos (mode RESET). Dans ce but, l'alternance de pleins (les colonnes) et de vides agit sur différentes bascules pour activer ou désactiver des fonctions relatives à la mesure d'intervalles de temps.More precisely, the chronograph mechanism illustrated and described in this example is of the three-stroke single-pusher type, in other words a complete operating cycle corresponds to three steps of the column wheel 30. In fact, each pressure on the pusher 35 causes a rotation of one step of the column wheel 30, successively passing the chronograph function from a state at rest (RESET mode) to a measurement state of a time (START mode), the state of measurement of a time (START mode) to a stopped state (STOP mode) or from the stopped state (STOP mode) to the idle state (RESET mode). For this purpose, the alternation of solids (columns) and empty acts on different latches to activate or deactivate functions relating to the measurement of time intervals.

La roue à colonnes coopère notamment avec une bascule d'embrayage 36, portant un mobile d'embrayage 38 et montée pivotante sur le bâti entre une première position, de repos ou débrayée, et une seconde position, d'entraînement ou embrayée. La bascule d'embrayage 36 est agencée ici pour établir ou interrompre une liaison cinématique dans le rouage de chronographe, et permettre l'entraînement de mobiles menés, ici les compteurs de chronographe 10 et 20, à partir d'un rouage de finissage (non représenté), par l'intermédiaire d'un mobile menant, ici une roue de secondes 40 communément appelée roue sur champs pour ce qui concerne le compteur 10, et par soit un mobile de centre (non visible) soit la roue de chronographe 11 pour ce qui concerne le compteur 20. Dans ce sens, le mobile d'embrayage joue le rôle d'un mobile de transmission entre le mobile menant et au moins un mobile mené. Le mobile menant est ici entraîné par un mobile d'entraînement (non visible), lui-même entraîné à partir d'une source d'énergie du mouvement horloger, éventuellement par l'intermédiaire d'un rouage de finissage.The column wheel cooperates in particular with a clutch rocker 36, carrying a clutch mobile 38 and pivotally mounted on the frame between a first position, resting or disengaged, and a second position, driving or engaged. The clutch rocker 36 is arranged here to establish or interrupt a kinematic connection in the chronograph wheel, and to allow the driving of driven mobiles, here the chronograph counters 10 and 20, from a finishing train (no represented), by means of a mobile moving, here a wheel of seconds 40 commonly called wheel over fields with respect to the counter 10, and by either a center mobile (not visible) or the chronograph wheel 11 for Regarding the counter 20. In this sense, the clutch mobile acts as a transmission mobile between the mobile and at least one driven mobile. The driving mobile is here driven by a drive wheel (not visible), itself driven from a power source of the watch movement, possibly via a finishing train.

Comme décrit ci-dessous, le mobile compteur des minutes 20 est, dans cette forme d'exécution, entrainé par le mobile de centre (ou de minutes) du mouvement horloger, via un mobile intermédiaire 42 qui engrène en permanence avec la roue 23 du compteur 20. Dans une variante (décrite ultérieurement, en relation avec l'illustration de la figure 5) le compteur des minutes 20 peut être à la place entraîné, toujours via un mobile intermédiaire 142, à partir du compteur de secondes 10 lorsque ce dernier est en prise avec le mobile d'embrayage 38. Selon cette variante, c'est le mobile 142 et pas le mobile 20 qui comprend une roue montée à friction sur l'arbre du mobile.As described below, the mobile minute counter 20 is, in this embodiment, driven by the center mobile (or minutes) of the watch movement, via an intermediate mobile 42 which meshes permanently with the wheel 23 of the 20. In a variant (described later, in connection with the illustration of the figure 5 ) the minute counter 20 can be instead driven, still via an intermediate mobile 142, from the seconds counter 10 when the latter is engaged with the clutch mobile 38. According to this variant, it is the mobile 142 and not the mobile 20 which comprises a wheel frictionally mounted on the shaft of the mobile.

La roue à colonnes 30 coopère également avec des freins 44 et 46 dont la fonction est, typiquement, de maintenir fixe la position angulaire, respectivement, de la roue de chronographe 11 et de la roue du compteur des minutes 21, lorsque la mesure d'un temps est interrompue, avant remise à zéro.The column wheel 30 also cooperates with brakes 44 and 46 whose function is, typically, to maintain fixed the angular position, respectively, of the chronograph wheel 11 and the wheel of the minute counter 21, when the measurement of a time is interrupted before resetting.

Par ailleurs, la roue à colonnes 30 est agencée pour coopérer avec le marteau de remise à zéro des secondes 14, tandis que ce dernier coopère lui-même avec le marteau de remise à zéro des minutes 24 par l'intermédiaire d'un premier bec 48, de telle manière que les deux marteaux sont synchronisés. En effet, le marteau des secondes 14 comprend un second bec 50 coopérant ou non avec les colonnes de la roue à colonnes 30 pour définir la position angulaire du marteau. Les marteaux sont susceptibles de se déplacer, de manière conventionnelle, entre une position au repos, dans laquelle chacun d'eux est en appui contre la came en coeur à laquelle il est associé, et une position levée, dans laquelle chacun d'eux est distant de la came en coeur à laquelle il est associé pour laisser la roue 11, 21 correspondante libre de tourner et effectuer la mesure d'un temps.Furthermore, the column wheel 30 is arranged to cooperate with the reset reset hammer 14, while the latter cooperates itself with the reset hammer minutes 24 via a first nozzle 48, so that both hammers are synchronized. Indeed, the seconds hammer 14 comprises a second spout 50 cooperating or not with the columns of the column wheel 30 to define the angular position of the hammer. The hammers are capable of moving, in a conventional manner, between a rest position, in which each of them bears against the core cam with which it is associated, and a raised position, in which each of them is remote from the core cam with which it is associated to let the corresponding wheel 11, 21 free to turn and measure a time.

Divers ressorts 52, 54, 56, 58, 60, 62 et 64 ont en outre été représentés à titre non limitatif, ceux-ci agissant respectivement sur la commande 34, sur les marteaux de remise à zéro des secondes 14 et des minutes 24, sur les freins des secondes 44 et des minutes 46, sur la bascule d'embrayage 36 et sur la roue à colonnes 30, pour en définir des positions par défaut, de manière connue.Various springs 52, 54, 56, 58, 60, 62 and 64 have also been shown in non-limiting manner, these acting respectively on the control 34, on the reset hammers of the seconds 14 and minutes 24, on the brakes seconds 44 and minutes 46, the clutch rocker 36 and the column wheel 30, to set default positions, in a known manner.

La figure 1 illustre le mouvement horloger alors que le mécanisme de chronographe est dans son état au repos (mode RESET). Dans cet état, les marteaux 14 et 24 sont positionnés en appui contre les cames en coeur 12, 22 pour maintenir les organes d'affichage des temps mesurés immobiles, dans leur position correspondant à la mesure d'un temps nul.The figure 1 illustrates the watch movement while the chronograph mechanism is in its idle state (RESET mode). In this state, the hammers 14 and 24 are positioned in abutment against the core cams 12, 22 to keep the display members of the measured times immobile, in their position corresponding to the measurement of a zero time.

Dans le même temps, les freins 44 et 46 sont ici préférablement positionnés à distance des roues 11 et 21. Les freins pourraient aussi être positionnés en appui contre les roues 11 et 21, dans cet état, sans pour autant sortir du cadre de la présente invention.At the same time, the brakes 44 and 46 are here preferably positioned at a distance from the wheels 11 and 21. The brakes could also be positioned in abutment against the wheels 11 and 21, in this state, without departing from the scope of this invention.

La bascule d'embrayage 36 est positionnée dans sa position débrayée, en étant en appui sur une colonne de la roue à colonnes 30, de telle manière que la liaison cinématique entre la roue sur champs 40 et la roue de chronographe 11 n'est pas établie, le mobile d'embrayage 38 n'engrenant pas avec la roue de chronographe 11 dans cette configuration. Dans cette forme d'exécution, la roue à friction 23 du mobile compteur de minutes 20 engrène en permanence avec une roue du mobile intermédiaire 42, tandis que l'autre roue de ce mobile intermédiaire 42 engrène avec le mobile de centre du mouvement horloger. Puisque le marteau 24 agissant contre le coeur 22 maintient la roue 21 du compteur de minutes 20 à la position zéro, il y a un débrayage entres les roues 21 et 23 grâce à la friction de la roue 23, et la roue 21 reste immobile.The clutch lever 36 is positioned in its disengaged position, bearing on a column of the column wheel 30, in such a way that the kinematic connection between the field wheel 40 and the chronograph wheel 11 is not established, the clutch mobile 38 not meshing with the chronograph wheel 11 in this configuration. In this embodiment, the friction wheel 23 of the mobile minute counter 20 meshes permanently with a wheel of the intermediate mobile 42, while the other wheel of the intermediate mobile 42 meshes with the mobile center of the watch movement. Since the hammer 24 acting against the core 22 keeps the wheel 21 of the minute counter 20 at the zero position, there is a disengagement between the wheels 21 and 23 thanks to the friction of the wheel 23, and the wheel 21 remains stationary.

Une pression sur le poussoir 35 fait tourner la roue à colonnes 30 d'un pas, par l'intermédiaire de la commande 34, pour la positionner dans sa configuration illustrée sur la figure 2, correspondant à la mesure d'un temps (mode START).Pressing on the pusher 35 rotates the column wheel 30 by one step, via the control 34, to position it in its configuration shown in FIG. figure 2 , corresponding to the measurement of a time (START mode).

Lorsque la roue à colonnes 30 tourne, elle actionne la bascule d'embrayage 36 et les marteaux 14, 24. En particulier, la colonne sur laquelle la bascule d'embrayage 36 était en appui au repos se décale et fait tomber la bascule d'embrayage dans le vide situé entre elle et la colonne suivante, sous l'effet de l'action du ressort 62, pour placer la bascule d'embrayage dans son état embrayé.When the column wheel 30 rotates, it actuates the clutch rocker 36 and the hammers 14, 24. In particular, the column on which the clutch rocker 36 was resting support shifts and drops the rocker clutch in the vacuum located between it and the next column, under the action of the spring 62, to place the clutch rocker in its engaged state.

Le mobile d'embrayage 38 entre alors en prise avec la roue de chronographe 11.The clutch mobile 38 then enters into engagement with the chronograph wheel 11.

Les marteaux 14 et 24 sont soulevés, juste après la chute de la bascule, par une colonne de la roue à colonnes 30, pour libérer les roues de compteurs chronographes des secondes 11 et des minutes 21.The hammers 14 and 24 are raised, just after the fall of the rocker, by a column of the column wheel 30, to release the chronograph counters wheels seconds 11 and minutes 21.

Les freins 44 et 46 restent quant à eux en appui sur les mêmes colonnes que dans la configuration au repos pour rester à distance des roues de chronographe 11 et 21.The brakes 44 and 46 remain in their support on the same columns as in the rest configuration to stay away from the chronograph wheels 11 and 21.

En cours de mesure, le mobile d'embrayage 38 assure le rôle de mobile de transmission entre la roue sur champs 40 et la roue de chronographe 11. N'étant plus bloquée par le marteau 24, agissant contre le coeur 22, la roue des minutes de chronographe 21 embraye avec la roue 23 afin que la roue 21 soit entrainée par le mobile de centre du mouvement horloger, par l'intermédiaire du mobile 42 remplissant également le rôle d'un mobile de transmission.During measurement, the clutch mobile 38 acts as a transmission mobile between the field wheel 40 and the chronograph wheel 11. No longer being blocked by the hammer 24, acting against the heart 22, the wheel minutes of chronograph 21 engages with the wheel 23 so that the wheel 21 is driven by the mobile center of the watch movement, through the mobile 42 also fulfilling the role of a mobile transmission.

Une nouvelle pression sur le poussoir 35 fait à nouveau tourner la roue à colonnes 30 d'un pas, par l'intermédiaire de la commande 34, pour la positionner dans sa configuration illustrée sur la figure 3, correspondant à l'interruption de la mesure d'un temps (mode STOP).Pressing the pusher 35 again rotates the column wheel 30 one step, via the control 34, to position it in its configuration shown in FIG. figure 3 , corresponding to the interruption of the measurement of a time (STOP mode).

Lorsque la roue à colonnes 30 tourne, une nouvelle colonne vient soulever la bascule d'embrayage 36 qui interrompt la liaison cinématique entre le mobile d'embrayage 38 et la roue de chronographe 11, dans son état débrayé.When the column wheel 30 rotates, a new column raises the clutch lever 36 which interrupts the kinematic connection between the clutch mobile 38 and the chronograph wheel 11, in its disengaged state.

Le marteau 14 reste en appui sur la même colonne que dans la phase précédente, tandis que les freins 44 et 46 sont libérés, avant la montée de la bascule 36, par décalage des colonnes sur lesquels ils reposaient jusque-là, et peuvent tomber sur les roues de chronographes des secondes 11 et des minutes 21 pour les verrouiller dans leurs positions respectives, sous l'effet de l'action de leurs ressorts respectifs 58 et 60.The hammer 14 remains resting on the same column as in the previous phase, while the brakes 44 and 46 are released, before the rise of the rocker 36, by shifting the columns on which they had previously rested, and can fall on the chronograph wheels of seconds 11 and minutes 21 to lock in their respective positions, under the effect of the action of their respective springs 58 and 60.

Une nouvelle pression sur le poussoir 35 fait à nouveau tourner la roue à colonnes d'un pas pour revenir à la configuration illustrée sur la figure 1 (mode RESET).Pressing the pusher 35 again turns the column wheel one step further to return to the configuration illustrated in FIG. figure 1 (RESET mode).

La figure 4 illustre une vue en perspective simplifiée d'un premier détail de construction du rouage de chronographe qui vient d'être décrit.The figure 4 illustrates a simplified perspective view of a first construction detail of the chronograph wheel which has just been described.

Plus précisément, la figure 4 illustre plus clairement le mode de coopération entre les mobiles menant, de transmission et mené, c'est-à-dire entre la roue sur champs 40, le mobile d'embrayage 38 et la roue de chronographe 11.More specifically, the figure 4 illustrates more clearly the mode of cooperation between the leading, transmission and driven mobiles, that is to say between the field wheel 40, the clutch mobile 38 and the chronograph wheel 11.

Il ressort de la figure 4 que le mobile d'embrayage, ou de transmission, comprend une première roue 68 agencée en prise permanente avec la roue sur champs 40, de manière conventionnelle.It appears from figure 4 that the clutch mobile, or transmission, comprises a first wheel 68 arranged in permanent engagement with the field wheel 40, in a conventional manner.

La présente invention prévoit l'agencement d'une roue montée à friction sur son arbre dans le rouage de chronographe. Cette roue est ici une deuxième roue 70 montée à friction sur l'arbre 72 du mobile d'embrayage 38. Un pont 73 est solidaire de la bascule d'embrayage 36 pour assurer le montage à pivot de l'arbre 72.The present invention provides the arrangement of a wheel frictionally mounted on its shaft in the chronograph wheel. This wheel is here a second wheel 70 frictionally mounted on the shaft 72 of the clutch mobile 38. A bridge 73 is integral with the clutch rocker 36 to ensure pivotal mounting of the shaft 72.

Lorsque la bascule d'embrayage 36 tombe entre deux colonnes de la roue à colonnes 30, pour passer de sa position illustrée sur la figure 1 à celle illustrée sur la figure 2 (enclenchement du mode START), la première roue 68 roule sur la roue sur champs 40, entraînant l'arbre 72 et la deuxième roue 70 en rotation dans le même sens.When the clutch rocker 36 falls between two columns of the column wheel 30, to move from its position illustrated on the figure 1 to that illustrated on the figure 2 (Engaging the START mode), the first wheel 68 rolls on the field wheel 40, driving the shaft 72 and the second wheel 70 in rotation in the same direction.

La denture de la deuxième roue 70 s'engage alors dans la denture de la roue de chronographe 11 avec un mouvement combiné de translation et de rotation.The toothing of the second wheel 70 then engages in the toothing of the chronograph wheel 11 with a combined movement of translation and rotation.

La bascule d'embrayage 36, les marteaux 14, 24 et les colonnes de la roue à colonnes 30 sont préférablement conformés et agencés de telle manière que les marteaux 14, 24 sont encore en appui contre les cames en coeur 12, 22 au moment où la denture de la deuxième roue 70 s'engage dans la denture de la roue de chronographe 11.The clutch rocker 36, the hammers 14, 24 and the columns of the column wheel 30 are preferably shaped and arranged in such a way that the hammers 14, 24 are still bearing against the core cams 12, 22 at the moment when the toothing of the second wheel 70 engages in the toothing of the chronograph wheel 11.

Ainsi, lorsque les dentures de la deuxième roue 70 et de la roue de chronographe 11 ne sont pas alignées l'une avec l'autre, ce qui entraîne le saut de l'aiguille dans les mécanismes de l'art antérieur tel que mentionné plus haut, la deuxième roue 70 glisse ici sur son arbre 72, grâce à son assemblage par friction, pour aligner sa denture avec celle de la roue 11, sous l'effet de l'action du ressort 62 repoussant la bascule d'embrayage 36 en direction de la roue 11. Ce mouvement n'entraîne pas ici de saut d'aiguille étant donné que la roue 11 est bloquée par son marteau de remise à zéro 14.Thus, when the teeth of the second wheel 70 and the chronograph wheel 11 are not aligned with each other, which causes the jump of the needle in the mechanisms of the prior art as mentioned above. high, the second wheel 70 slides here on its shaft 72, thanks to its frictional assembly, to align its toothing with that of the wheel 11, under the effect of the action of the spring 62 pushing the clutch lever 36 into position. direction of the wheel 11. This movement does not involve needle jumping here because the wheel 11 is blocked by its reset hammer 14.

Les formes du bec 50 et des colonnes de la roue à colonnes 30 sont adaptées pour assurer une levée du marteau 14 de la came 12 dès que la denture de la deuxième roue 70 est engagée dans celle de la roue 11. La mesure d'un temps peut alors démarrer.The shapes of the spout 50 and columns of the column wheel 30 are adapted to ensure a lifting of the hammer 14 of the cam 12 as soon as the toothing of the second wheel 70 is engaged in that of the wheel 11. The measurement of a time can then start.

L'assemblage de la deuxième roue 70 sur l'arbre 72 peut être réalisé de toute manière connue et adaptée et l'homme du métier ne rencontrera pas de difficulté particulière pour le mettre en oeuvre. A titre d'exemple illustratif non limitatif, l'homme du métier pourra s'inspirer de l'enseignement du brevet CH 701075 B1 pour réaliser cet assemblage.The assembly of the second wheel 70 on the shaft 72 can be made in any known manner and adapted and the skilled person will not encounter any particular difficulty to implement it. As a non-limiting illustrative example, the skilled person can draw inspiration from the teaching of the patent CH 701075 B1 to achieve this assembly.

En alternative, il est possible de prévoir que le mobile d'embrayage ne comporte qu'une seule roue 68, la deuxième roue 70 étant dans ce cas assemblée à friction sur l'arbre du mobile de chronographe 10 en étant agencée pour engrener avec la roue d'embrayage 68. Dans ce cas, la deuxième roue 70 glisserait sur l'arbre du mobile 10 lors de la chute de la bascule d'embrayage 36, alors que la roue de chronographe 11 serait bloquée par le marteau 14, pour éviter un saut de l'aiguille correspondante.Alternatively, it is possible to provide that the clutch mobile has only one wheel 68, the second wheel 70 being in this case frictionally assembled on the shaft of the chronograph mobile 10 being arranged to mesh with the In this case, the second wheel 70 would slide on the shaft of the mobile 10 during the fall of the clutch lever 36, while the chronograph wheel 11 would be blocked by the hammer 14, to avoid a jump of the corresponding needle.

On mentionnera également la possibilité d'assembler la deuxième roue 70 à friction sur le mobile menant, c'est-à-dire sur l'arbre solidaire de la roue sur champs 40, sans sortir du cadre de la présente invention. Dans ce cas, la roue sur champs 40 serait entraînée par le mouvement horloger mais c'est la deuxième roue 70 qui serait agencée en prise permanente avec la roue unique 68 du mobile d'embrayage 38, voire en alternative avec le mobile d'entraînement.Mention may also be made of the possibility of assembling the second friction wheel 70 on the driving mobile, that is to say on the shaft integral with the field wheel 40, without departing from the scope of the present invention. In this case, the wheel field 40 would be driven by the watch movement but it is the second wheel 70 which would be arranged in permanent engagement with the single wheel 68 of the clutch mobile 38, or alternatively with the drive wheel .

La figure 5 illustre un exemple d'une construction alternative du rouage de chronographe des figures 1 à 3, permettant de mettre en évidence une approche alternative pour assurer l'entraînement du compteur des minutes. Selon cette variante, le compteur des minutes 20 n'a plus de roue à friction et le mobile entier est entraîné, via un mobile intermédiaire 142, à partir du compteur de secondes 10 lorsque ce dernier est en prise avec le mobile d'embrayage 38.The figure 5 illustrates an example of an alternative construction of the chronograph wheel of Figures 1 to 3 , allowing to highlight an alternative approach to ensure the training of the minute counter. According to this variant, the minute counter 20 no longer has a friction wheel and the entire mobile is driven, via an intermediate mobile 142, from the seconds counter 10 when the latter is engaged with the clutch mobile 38 .

En fonction des positions angulaires des roues 11 et 21 en cours de mesure d'un temps, il est possible que ces deux roues soient amenées à tourner en sens opposés lors de la remise à zéro par les marteaux 14, 24.Depending on the angular positions of the wheels 11 and 21 being measured a time, it is possible that these two wheels are rotated in opposite directions during the reset by the hammers 14, 24.

Selon cette variante, la méthode d'entraînement du compteur des minutes 20 à partir du compteur des secondes 10 par l'intermédiaire d'un doigt peut être remplacée par un engrenage, incluant une roue montée à friction sur son arbre et présentant une meilleure précision de fonctionnement.According to this variant, the method of driving the minute counter 20 from the seconds counter 10 via a finger can be replaced by a gear, including a wheel fitted with friction on its shaft and having a better accuracy. Operating.

En effet, il ressort de la figure 5 que le mobile intermédiaire 142 comporte des première et seconde roues 74 et 76, dont la première 74 est solidaire de l'arbre 78 du mobile 142, tandis que la seconde 76 est montée à friction sur cet arbre 78.Indeed, it appears from figure 5 that the intermediate mobile 142 comprises first and second wheels 74 and 76, the first 74 is integral with the shaft 78 of the mobile 142, while the second 76 is frictionally mounted on the shaft 78.

La première roue 74 est ici agencée en prise permanente avec un renvoi 80 solidaire de l'arbre 82 du mobile compteur des secondes 10.The first wheel 74 is here arranged in permanent engagement with a reference 80 secured to the shaft 82 of the mobile counter seconds 10.

Ainsi, dans la variante de la figure 5, lors de la mesure d'un temps le déplacement du mobile des secondes 10 est transmis au mobile des minutes 20 par le mobile intermédiaire 142, ce qui permet d'obtenir un affichage traînant des minutes chronométrées, contrairement aux mécanismes sautants à doigt escamotable.So, in the variant of the figure 5 during the measurement of a time, the movement of the second mobile 10 is transmitted to the mobile of minutes 20 by the intermediate mobile 142, which makes it possible to obtain a display trailing timed minutes, in contrast to jumping retractable finger mechanisms.

Lors d'une opération de remise à zéro, la seconde roue 76 se met à glisser sur son arbre 78 dès que les mobiles des secondes 10 et des minutes 20 sont entraînés de manière non synchronisée par leurs marteaux respectifs.During a resetting operation, the second wheel 76 begins to slide on its shaft 78 as soon as the seconds and minutes mobiles 20 are driven in a non-synchronized way by their respective hammers.

Dans ce cas, le mobile menant est le mobile des secondes de chronographe 10 dont les mouvements sont transmis au mobile des minutes de chronographes 20, jouant le rôle de mobile mené, par l'intermédiaire du mobile intermédiaire 142 jouant le rôle de mobile de transmission.In this case, the moving mobile is the mobile seconds chronograph 10 whose movements are transmitted to the mobile minutes of chronographs 20, playing the role of mobile led through the intermediate mobile 142 acting as a mobile transmission .

Bien entendu, l'homme du métier pourra choisir si la roue montée à friction sur l'arbre du mobile intermédiaire 142 est celle qui engrène avec le mobile des secondes 10 ou celle qui engrène avec le mobile des minutes 20 sans sortir du cadre de l'invention. En alternative, il est également possible de prévoir que les roues 74 et 76 sont toutes deux solidaires de l'axe 78 mais que la roue montée à friction sur son arbre est le renvoi 80 du mobile des secondes 10.Of course, a person skilled in the art will be able to choose whether the wheel frictionally mounted on the shaft of the intermediate mobile 142 is that which meshes with the mobile of the seconds 10 or that which meshes with the mobile of the minutes 20 without departing from the scope of the 'invention. Alternatively, it is also possible to provide that the wheels 74 and 76 are both integral with the axis 78 but that the wheel frictionally mounted on its shaft is the return 80 of the mobile seconds 10.

Grâce à la construction qui vient d'être décrite, notamment par l'implantation d'une roue montée à friction sur son arbre en un emplacement judicieux, il apparaît comment un mécanisme de chronographe de construction proche des constructions connues peut être réalisé, tout en évitant certains problèmes de fonctionnement comme le saut de l'aiguille au démarrage.Thanks to the construction which has just been described, in particular by the implantation of a wheel frictionally mounted on its shaft in a judicious location, it appears how a construction chronograph mechanism close to known constructions can be realized, while avoiding some operating problems like jumping the needle at startup.

On notera par ailleurs, de manière générale, que les roues du rouage de chronographe selon la présente invention peuvent avantageusement présenter chacune une denture présentant un profil de denture NIHS 20-25 ou une autre denture à ogives à bon rendement de transmission. Ce profil, conventionnel dans les rouages autres que ceux des mécanismes de chronographe, permet d'assurer un meilleur rendement que les profils triangulaires généralement utilisés notamment entre la roue d'embrayage et la roue du mobile des secondes de chronographe. En outre, l'utilisation d'un tel profil de denture permet d'éviter un chevrotement de l'aiguille d'affichage des secondes des temps mesurés sans avoir à utiliser le conventionnel ressort de friction. De manière préférée, la roue montée à friction sur son arbre et la roue avec laquelle elle coopère présentent chacune une denture à micro-module, tandis que les autres roues présentent préférablement chacune une denture à petit module.It will also be noted, in general, that the wheels of the chronograph train according to the present invention may advantageously each have a toothing having an NIHS tooth profile 20-25 or other warhead gear with good transmission efficiency. This profile, conventional in the workings other than those of the chronograph mechanisms, ensures better performance than the triangular profiles generally used in particular between the clutch wheel and the wheel of the mobile seconds chronograph. In addition, the use of such a tooth profile makes it possible to avoid the needling of the needle display of the measured time seconds without having to use the conventional friction spring. Preferably, the wheel frictionally mounted on its shaft and the wheel with which it cooperates each have a micro-module toothing, while the other wheels preferably each have a small module toothing.

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 mobiles que comporte le rouage de chronographe ou les implantations illustrées et décrites pour la roue montée à friction sur son arbre.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 mobiles that the chronograph gear train or the implantations illustrated and described for the wheel frictionally mounted on its shaft.

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 un rouage de chronographe comportant au moins une roue montée à friction sur l'un des arbres du rouage, sans sortir du cadre de la présente invention. En particulier, on notera que plusieurs roues de friction peuvent être combinées dans une même partie du rouage sans sortir du cadre de l'invention, ou encore qu'une seule roue de friction peut être utilisée, comme par exemple celle du mobile d'embrayage, sans pour autant nécessairement mettre en oeuvre le mobile intermédiaire 42 ou 142.The skilled person will not encounter any particular difficulty in adapting the content of the present disclosure to his own needs and implementing a chronograph wheel having at least one wheel frictionally mounted on one of the shafts of the gear train, without leaving of the scope of the present invention. In particular, it will be noted that several friction wheels can be combined in the same part of the gear train without departing from the scope of the invention, or that a single friction wheel can be used, such as that of the clutch mobile , without necessarily implementing the intermediate mobile 42 or 142.

Claims (14)

Mécanisme de chronographe, pour mouvement horloger (1), comportant un mobile menant susceptible d'être entraîné en rotation par un mobile d'entraînement pour assurer l'entraînement à la demande d'un mobile mené (10, 20) par l'intermédiaire d'un mobile de transmission (38, 42, 142), ledit mobile d'entraînement étant lui-même destiné à être entraîné à partir d'une source d'énergie du mouvement horloger, ledit mobile mené (10, 20) étant destiné à contrôler les déplacements d'un organe d'affichage, chacun desdits mobiles d'entraînement, menant, de transmission (38, 42, 142) et mené (10, 20) comportant un arbre (72, 78, 82) solidaire d'une première roue (11, 40, 68, 74),
caractérisé en ce que l'un au moins parmi lesdits mobiles menant, de transmission (38, 42, 142) et mené (10, 20) comporte une deuxième roue (70, 76) montée à friction sur l'arbre (72, 78) correspondant et agencée pour coopérer avec ladite première roue (11, 21) d'un autre mobile (10, 20) parmi lesdits mobiles d'entraînement, menant, de transmission (38, 42, 142) et mené (10,20).Chronograph mechanism, for a watch movement (1), comprising a driving mobile capable of being rotated by a driving wheel for driving on demand a driven wheel (10, 20) via a transmission wheel (38, 42, 142), said driving wheel being itself intended to be driven from a power source of the watch movement, said driven wheel (10, 20) being intended controlling the movements of a display member, each of said drive, driving, transmission (38, 42, 142) and driven (10, 20) having a shaft (72, 78, 82) secured to a first wheel (11, 40, 68, 74),
characterized in that at least one of said driving, transmitting (38, 42, 142) and driven (10, 20) driving wheels comprises a second wheel (70, 76) frictionally mounted on the shaft (72, 78). ) corresponding and arranged to cooperate with said first wheel (11, 21) of another mobile (10, 20) among said driving, driving, transmission (38, 42, 142) and driven (10.20) mobiles . Mécanisme selon la revendication 1, caractérisé en ce que ladite deuxième roue (70) est montée à friction sur l'arbre (72) dudit mobile de transmission (38) et est agencée pour coopérer avec la première roue (11) dudit mobile mené (10) tandis que la première roue (68) dudit mobile de transmission (38) est agencée pour coopérer avec la première roue (40) dudit mobile menant.Mechanism according to claim 1, characterized in that said second wheel (70) is frictionally mounted on the shaft (72) of said moving transmission part (38) and is arranged to cooperate with the first wheel (11) of said driven movable ( 10) while the first wheel (68) of said transmission wheel (38) is arranged to cooperate with the first wheel (40) of said mobile driving. Mécanisme selon la revendication 2, caractérisé en ce que la première roue (40) dudit mobile menant est une roue sur champs tandis que la première roue (11) dudit mobile mené (10) est une roue des secondes de chronographe, et en ce que ledit mobile de transmission (38) est un mobile d'embrayage porté par une bascule d'embrayage (36) destinée à être agencée sur le mouvement horloger (1) en étant susceptible de se déplacer entre des première et deuxième positions, respectivement associées à des états embrayé et débrayé entre ladite deuxième roue (70) dudit mobile de transmission (38) et la première roue (11) dudit mobile mené (10).Mechanism according to claim 2, characterized in that the first wheel (40) of said driving mobile is a wheel on fields while the first wheel (11) of said driven mobile (10) is a chronograph seconds wheel, and in that said transmission wheel (38) is a clutch mobile carried by a clutch rocker (36) intended to be arranged on the watch movement (1) being able to move between first and second positions, respectively associated with states engaged and disengaged between said second wheel (70) of said transmission wheel (38) and the first wheel (11) of said driven wheel (10). Mécanisme selon la revendication 1, caractérisé en ce que ladite deuxième roue est montée à friction sur l'arbre (82) dudit mobile mené (10) et est agencée pour coopérer avec la première roue (68) dudit mobile de transmission (38) tandis que la première roue (11) dudit mobile mené (10) est destinée à contrôler les déplacements d'un organe d'affichage.Mechanism according to claim 1, characterized in that said second wheel is frictionally mounted on the shaft (82) of said driven wheel (10) and is arranged to cooperate with the first wheel (68) of said transmission wheel (38) while the first wheel (11) of said driven wheel (10) is intended to control the movements of a display member. Mécanisme selon la revendication 4, caractérisé en ce que la première roue (40) dudit mobile menant est une roue sur champs tandis que la première roue (11) dudit mobile mené (10) est une roue des secondes de chronographe, et en ce que ledit mobile de transmission (38) est un mobile d'embrayage porté par une bascule d'embrayage (36) destinée à être agencée sur le mouvement horloger (1) en étant susceptible de se déplacer entre des première et deuxième positions, respectivement associées à des états embrayé et débrayé entre la première roue (68) dudit mobile de transmission (38) et ladite deuxième roue dudit mobile mené (10).Mechanism according to claim 4, characterized in that the first wheel (40) of said driving mobile is a wheel on fields while the first wheel (11) led from said mobile (10) is a wheel of the chronograph seconds, and in that said transmission wheel (38) is a clutch mobile carried by a clutch rocker (36) intended to be arranged on the watch movement (1) being able to move between first and second positions, respectively associated with states engaged and disengaged between the first wheel (68) of said transmission wheel (38) and said second wheel of said driven wheel (10). Mécanisme selon la revendication 1, caractérisé en ce que ledit mobile menant est un mobile (10) des secondes de chronographe tandis que ledit mobile mené est un mobile (20) des minutes de chronographe, ledit mobile de transmission comportant un mobile intermédiaire (142) comprenant un arbre (78) destiné à être monté pivotant sur le mouvement horloger (1) et portant une roue (76) assemblée à friction.Mechanism according to claim 1, characterized in that said moving mobile is a mobile (10) chronograph seconds while said mobile is a moving mobile (20) chronograph minutes, said mobile transmission comprising an intermediate mobile (142) comprising a shaft (78) for pivotal mounting on the watch movement (1) and carrying a frictionally mounted wheel (76). Mécanisme selon l'une des revendications précédentes, caractérisé en ce que lesdites premières et deuxième roues (11, 40, 68, 70, 76) présentent chacune une denture présentant un profil de denture NIHS 20-25 ou une denture du type à ogives.Mechanism according to one of the preceding claims, characterized in that said first and second wheels (11, 40, 68, 70, 76) each have a toothing having an NIHS tooth profile 20-25 or a warhead type toothing. Mécanisme selon la revendication 7, caractérisé en ce que ladite deuxième roue (70, 76) et la première roue (11, 21) avec laquelle elle coopère présentent chacune une denture à micro-module.Mechanism according to claim 7, characterized in that said second wheel (70, 76) and the first wheel (11, 21) with which it cooperates each have a micro-module toothing. Mécanisme selon la revendication 8, caractérisé en ce que lesdites premières roues associées à des roues autres que ladite deuxième roue présentent chacune une denture à petit module.Mechanism according to claim 8, characterized in that said first wheels associated with wheels other than said second wheel each have a small modulus toothing. Mécanisme selon l'une des revendications 1 à 9 comprenant
une came en coeur (12) destinée à être solidaire en rotation de l'organe d'affichage,
un marteau de remise à zéro (14) ayant une surface adaptée destinée à coopérer avec la came en coeur (12),
un frein (44) pour, en position de service, maintenir fixe la position angulaire d'une roue dudit mobile mené (11) solidaire de la came en coeur (12),
une bascule d'embrayage (36) portant le mobile de transmission (38), et une roue à colonnes (30) destinée à coopérer avec ledit marteau (14), ledit frein (44) et ladite bascule d'embrayage (36), pour les actionner selon différents modes de fonctionnement START, STOP, RESET du mécanisme de chronographe,
caractérisé en ce que le marteau (14), la bascule d'embrayage (36) et la roue à colonnes (30) sont conformés et agencés de telle manière que, lors de l'enclenchement du mode START, le marteau (14) se soulève de la came en coeur (12) juste après l'actionnement de la bascule d'embrayage (36) par la roue à colonnes (30) visant à la placer dans son état embrayé.Mechanism according to one of Claims 1 to 9, comprising
a core cam (12) intended to be integral in rotation with the display member,
a reset hammer (14) having a surface adapted to cooperate with the core cam (12),
a brake (44) for, in the operating position, maintaining fixed the angular position of a wheel of said driven wheel (11) integral with the core cam (12),
a clutch rocker (36) carrying the transmission wheel (38), and a column wheel (30) for cooperating with said hammer (14), said brake (44) and said clutch rocker (36), to operate them according to different operating modes START, STOP, RESET of the chronograph mechanism,
characterized in that the hammer (14), the clutch rocker (36) and the column wheel (30) are shaped and arranged in such a way that, when the START mode is engaged, the hammer (14) is raises the core cam (12) just after the clutch lever (36) is actuated by the column wheel (30) to place it in its engaged state. Mécanisme selon la revendication 10, caractérisé en ce que le frein (44), la bascule d'embrayage (36) et la roue à colonnes (30) sont conformés et agencés de telle manière que, lors de l'enclenchement du mode STOP, le frein (44) agit sur ladite roue du mobile mené (11), pour maintenir sa position angulaire fixe, avant l'actionnement de la bascule d'embrayage (36) par la roue à colonnes (30) visant à la placer dans son état débrayé.Mechanism according to claim 10, characterized in that the brake (44), the clutch rocker (36) and the column wheel (30) are shaped and arranged in such a way that when the STOP mode is switched on, the brake (44) acts on said wheel of the driven wheel (11), to maintain its fixed angular position, before actuation of the clutch rocker (36) by the column wheel (30) to place it in its state disengaged. Mouvement horloger (1) comportant un mécanisme de chronographe selon l'une des revendications 1 à 11.Watch movement (1) comprising a chronograph mechanism according to one of claims 1 to 11. Mouvement horloger (1) selon la revendication 12, comportant un rouage de finissage comprenant un mobile de centre entraîné en rotation à partir d'une source d'énergie du mouvement horloger (1), caractérisé en ce que ledit mobile de centre remplit le rôle dudit mobile menant tandis que ledit mobile mené est un mobile (20) des minutes de chronographe, ledit mobile de transmission comportant un mobile intermédiaire (42) destiné à transmettre les mouvements dudit mobile de centre audit mobile (20) des minutes de chronographe.Horological movement (1) according to claim 12, comprising a going train comprising a movable center driven in rotation from a power source of the timepiece movement (1), characterized in that said movable center fulfills the role said mobile driving while said driven mobile is a mobile (20) minute chronograph, said mobile transmission comprising an intermediate mobile (42) for transmitting the movements of said mobile center said mobile (20) minutes chronograph. Pièce d'horlogerie comportant un mécanisme de chronographe selon l'une des revendications 12 ou 13.Timepiece comprising a chronograph mechanism according to one of claims 12 or 13.
EP14197810.6A 2014-12-12 2014-12-12 Chronograph mechanism for a clock movement Active EP3032358B1 (en)

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Application Number Priority Date Filing Date Title
EP14197810.6A EP3032358B1 (en) 2014-12-12 2014-12-12 Chronograph mechanism for a clock movement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14197810.6A EP3032358B1 (en) 2014-12-12 2014-12-12 Chronograph mechanism for a clock movement

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EP3032358A1 true EP3032358A1 (en) 2016-06-15
EP3032358B1 EP3032358B1 (en) 2020-10-07

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CN110073295A (en) * 2016-11-17 2019-07-30 诺格拉公司 System of connections for timer
WO2019179824A1 (en) * 2018-03-19 2019-09-26 Hublot Sa, Genève Chronograph for a timepiece
CN111895042A (en) * 2020-08-10 2020-11-06 周祖焕 Tripolar gear train device and constant speed clock
US11262707B2 (en) 2017-05-24 2022-03-01 Rolex Sa Mechanical connection device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110073295A (en) * 2016-11-17 2019-07-30 诺格拉公司 System of connections for timer
US11262707B2 (en) 2017-05-24 2022-03-01 Rolex Sa Mechanical connection device
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CN111895042A (en) * 2020-08-10 2020-11-06 周祖焕 Tripolar gear train device and constant speed clock
EP4310606A1 (en) * 2022-07-19 2024-01-24 Chopard Technologies SA Three-stroke chronograph mechanism and methods for manufacturing and for transforming two-stroke and three-stroke chronograph mechanisms
WO2024018336A1 (en) * 2022-07-19 2024-01-25 Chopard Technologies Sa Three-timer chronograph mechanism and methods for creating and converting two-timer and three-timer chronograph mechanisms

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