EP3182229A1 - Chronograph mechanism with fly-back hand with insulator - Google Patents

Chronograph mechanism with fly-back hand with insulator Download PDF

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Publication number
EP3182229A1
EP3182229A1 EP15200812.4A EP15200812A EP3182229A1 EP 3182229 A1 EP3182229 A1 EP 3182229A1 EP 15200812 A EP15200812 A EP 15200812A EP 3182229 A1 EP3182229 A1 EP 3182229A1
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EP
European Patent Office
Prior art keywords
split
wheel
chronograph
core
lever
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
EP15200812.4A
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German (de)
French (fr)
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EP3182229B1 (en
Inventor
Serge Nicollin
Cédric Mentzer
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Breitling AG
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Breitling AG
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Priority to EP15200812.4A priority Critical patent/EP3182229B1/en
Publication of EP3182229A1 publication Critical patent/EP3182229A1/en
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Publication of EP3182229B1 publication Critical patent/EP3182229B1/en
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0866—Special arrangements
    • G04F7/0876—Split-time function, e.g. rattrappante

Definitions

  • the present invention relates to a split-second chronograph mechanism.
  • chronograph hand In a chronograph, a pointer needle called chronograph hand can be successively set in motion, stopped and reset at the request of the user to measure durations.
  • the user has pushbuttons projecting around the periphery of the chronograph box.
  • Some chronographs include an additional mechanism for controlling a second needle, called a split-second needle.
  • a split-second needle At the start of the chronograph the two hands are superimposed and rotate together.
  • User pressure on a split-second push-button stops the split-second hand while the chronograph hand continues to rotate. The user can thus read the intermediate time indicated by the split-seconds hand.
  • a second press on the split-second push-button allows the split-seconds hand to realign on the chronograph hand and then to turn with the latter, the two hands then remaining superimposed.
  • the two needles can also be set together and reset.
  • Such a catch-up mechanism comprises a catch-up wheel integral with an axis which carries the catch-up needle.
  • a catch-up lever mounted on the catch-up wheel and subjected to the action of a return spring cooperates with a catch-up core integral with the axis which carries the chronograph hand, to secure the chronograph and split-seconds hands. during the measurement of an intermediate time and allow the split-seconds hand to realign on the chronograph hand after the measurement and playback of the split time.
  • a split-second gripper controlled by the split-second push-button stops or releases the split-second wheel by pinching or loosening the periphery of the split-second wheel.
  • Some catch-up mechanisms further comprise an insulator, that is to say a device designed to eliminate the contact between the lever and the split-core when the split-second wheel is stopped by the split-seconds pliers.
  • an insulator that is to say a device designed to eliminate the contact between the lever and the split-core when the split-second wheel is stopped by the split-seconds pliers.
  • Such an isolator makes it possible to avoid any disturbance of the chronograph operation due to the cooperation between the lever and the split-second heart. It generally includes an insulation wheel coaxial with the split-second wheel and the split-seconds heart. A pin driven into the isolation wheel does not act on the split lever when the split-seconds plier leaves the split-second wheel free but moves the split-second lever away from the split-second-half when the split-seconds-clip stops the split-second wheel. Examples of isolator are described in the documents CH 686545 and CH 705614 .
  • the split lever, its return spring and the pin driven into the insulation wheel delimit the space left available to the split core for its rotation when the split-second lever is removed from the heart of the rattrapante.
  • the path that travels through the top of the heart of the jumper must indeed be interrupted by the split lever or by its return spring or by the pin. It follows that the choice of the size of the jumper core depends on the configuration and the position of said lever, spring and pin.
  • a large core is advantageous because at constant moment exerted by the return spring on the catch-up lever the moment exerted by the catch-up lever on the catch-up core is higher or, conversely, at a constant moment exerted by the catch-up lever on the catch-up heart the moment exerted by the return spring on the split-lever is lower.
  • the present invention aims to propose an insulator split-second chronograph mechanism, the catch-up core of which may have a larger size than the cores of the known mechanisms.
  • a split-second chronograph mechanism comprising a split-second wheel integral with a split-second axis, a heart of catches integral with a chronograph axis, a catch-up lever carried by the catch-up wheel, arranged to cooperate with the catch-up heart and subjected to the action of a return spring, a stop member to stop or release the split wheel, and an isolator mechanism for suppressing contact between the split-second lever and the split-second core when the split-second wheel is stopped by the shut-off member, the isolating mechanism comprising an insulation wheel coaxial with the catching-up wheel and in the middle of a jumper and carrying a drive member arranged to act on the catch-up lever against the action of the return spring, characterized in that the driving member is part of a one-piece part comprising , in addition to the drive member, a body extending in a plane perpendicular to the split-seconds and chronograph axes, this body forming the insulation wheel or being rotationally
  • the pins driven in the insulating wheels have a diameter greater than 0.30 mm, generally equal to 0.40 mm. This large diameter is necessary for holding the pin in the insulation wheel.
  • the embodiment of the drive member as part of a one-piece piece further comprising a body extending in a plane perpendicular to the split and chronograph axes allows to confer the body of The drive has a smaller radial dimension, or even much smaller, than that of a conventional drive pin. Therefore, the split core can be enlarged while remaining free to rotate without hitting the drive member when the latter maintains the catch-up lever out of contact with the split core.
  • the catch-up lever and its return spring can be easily adapted, if necessary, to be located also beyond the path traveled by the top of the split-seconds heart.
  • the maximum radial dimension of the drive member is less than or equal to 0.20 mm.
  • the drive member is for example substantially in the shape of a rectangular parallelepiped.
  • the driving member is a portion of a folded blade forming or forming part of the one-piece piece.
  • the drive member is integral with the insulation wheel.
  • the present invention further provides a chronograph comprising a split-second chronograph mechanism as defined above.
  • a split-second chronograph mechanism intended to be part of a chronograph, for example of the wristwatch type, comprises a split-second wheel 1 integral with a split-second shaft 2 intended to carry a split-second needle.
  • the split axis 2 is a tube traversed longitudinally by a chronograph axis 3 intended to carry a chronograph hand (second hand).
  • the chronograph axis 3 is integral with a chronograph wheel (not shown) or connected to the chronograph wheel by a clutch.
  • the chronograph axis 3 is guided in stones 4, 5 respectively mounted in the plate 6 of the chronograph movement and in a chronograph bridge 7a.
  • the split lever 8 pivots about a pivot 10 and comprises a first arm 11 on which the spring acts 9 and a second arm 12 defining a spout 13.
  • the return spring 9 tends to maintain the spout 13 of the catch-up lever 8 in contact with the periphery of a catcher core 14 integral with the chronograph axis 3.
  • the spout 13 could be replaced by a roller mounted on the split lever 8 to be able to roll around the periphery of the split core 14.
  • the split wheel 1 is located axially between the catch-up core 14 and a jumper bridge 7b, the latter being crossed by the catches and chronograph axes 2, 3 and carrying a tube 7c which surrounds said pins 2, 3.
  • the split-second chronograph mechanism further comprises a split-second column wheel 15 comprising on a first level a ratchet 16 and on a second level a wheel 17 defining columns 18 and integral with the ratchet 16.
  • the ratchet 16 is held in position between two rotations by a jumper 19.
  • the columns 18 cooperate with a spout 21 of each arm of a catch-up clamp 22, so that successive rotations of the column wheel 15 controlled by successive presses on the split-second push-button close and open the clamp alternately.
  • the clutch wheel 22 is closed, the clutch wheel 1 is immobilized by friction between the respective friction surfaces 23 of the arms of the split-seconds pliers 22 and the periphery. of the split wheel 1.
  • the friction surfaces 23 are out of contact with the split wheel 1 and the latter is free to rotate.
  • the periphery of the split wheel 1 may be provided with a friction member 1a of natural or synthetic rubber, as shown, to increase the friction between the split-plier 22 and the split-second wheel 1.
  • the split-seconds pliers 22 are in the open position and the spout 13 of the retracting lever 8 is in the recess 14a of the second-stage core 14, between the two shoulders 14b of the latter, which solidarises the wheel of catching 1 and the chronograph axis 3 (cf. figure 3 ).
  • the chronograph and split-seconds hands are superimposed and rotate together.
  • the split-second gripper 22 is closed by an action of the push-button push-button via the split-second control member 20 and the column wheel 15 (cf. figure 4 )
  • the split wheel 1 and with it the catch-up needle stops while the chronograph axis 3 and with it the chronograph hand continue to rotate.
  • the split-second wheel 1 is released and, by the contact between the spout 13 of the split-seconds lever 8 and the periphery of the split-second core 14 and the force exerted by the return spring 9 on the split-seconds lever 8, the split-second wheel 1 is turned until the spout 13 finds the cut-out 14 a of the split-second heart 14, a position in which the split-second hand and the chronograph hand are superimposed.
  • the split-second chronograph mechanism further comprises an isolator mechanism for eliminating the contact between the spout 13 of the split-seconds lever 8 and the split-seconds core 14 when the split-second wheel 1 is stopped by the split-seconds pliers 22.
  • This isolator mechanism comprises an insulation wheel 24 coaxial with the split wheel 1 and the split core 14 and mounted idle about the split-second axis 2.
  • the insulation wheel 24 has teeth with wolf teeth that can driving a spout 25 of an isolation control lever 26, a second spout 27 cooperates with the columns 18 of the column wheel 15.
  • a one-piece drive piece 28 (cf. figures 1 and 5 ) is integral in rotation with the insulation wheel 24.
  • This one-piece drive part 28 comprises a body 29 of flat shape extending in a plane perpendicular to the axes of split 2 and chronograph 3 and therefore parallel to the wheels of split-seconds 1 and insulation 24, and a projecting portion 30 extending perpendicular to the plane of the body 29.
  • the projecting portion 30 is a drive member arranged to act on the split lever 8, more precisely on its arm 12.
  • the body 29 comprises a central portion 31 crossed by the axis of split second 2, two ears 32 receiving pins 33 for positioning the one-piece driving part 28 relative to the insulation wheel 24 perpendicularly to the split-seconds 2 and chronograph 3-axes, and a portion 34 of folded blade. A free end portion of the folded blade separated from the portion 34 by a fold 35 constitutes the drive member 30.
  • the split-second shaft 2 can have a function of guiding the one-piece drive part 28.
  • a single lug 32 and a single pin 33 can be provided for positioning the one-piece driving part 28 with respect to the insulating wheel 24.
  • the one-piece driving part 28 is held axially with a slight clearance between the split wheel 1 and the insulation wheel 24.
  • the one-piece driving part 28 could be rigidly fixed to the insulation wheel 24.
  • the pins 33 extend in height into recesses 36 that the split wheel 1 presents. During the simultaneous rotation of the chronograph and split-seconds hands, one of these pins 33 is pushed by an arm 37 of the split-seconds wheel. 1 which separates two recesses 36 (cf. figure 3 ), which makes the insulation wheel 24 integral with the split wheel 1. In this configuration, the drive member 30 does not act on the split lever 8.
  • the split-second gripper 22 When a pressure is applied on the splitter control member 20 rotating the column wheel 15, the split-second gripper 22 closes to stop the split-second wheel 1 and the isolation-control rocker 26, through its spout 25, turns the insulation wheel 24 a predetermined angle in the direction of rotation of the chronograph axis 3 and then maintains in position the insulation wheel 24 (cf. figure 4 ).
  • the one-piece drive piece 28 rotatably connected to the insulation wheel 24 moves from its rest position illustrated in FIG. figure 3 at an insulation position illustrated in the figure 4 , allowing the drive member 30 to move the catch-up lever 8 away from the take-off core 14 against the action of the return spring 9.
  • the chronograph hand and the chronograph shaft 3 can continue to turn without the tweeter lever 8 can disrupt their rotation.
  • the split-second gripper 22 reopens to release the split wheel 1 and, at the same time, the control rocker insulation 26 returns to its position illustrated in FIG. figure 3 by rotating the insulation wheel 24 in the opposite direction to the direction of rotation of the chronograph axis 3 to return to its initial position relative to the split wheel 1.
  • the split lever 8 released by the drive member 30 returns to contact with the catcher core 14 under the action of its return spring 9 to synchronize the split-second needle with the chronograph hand.
  • chronograph mechanism The other components of the chronograph mechanism according to the invention (chronograph column wheel, clutch device, reset device, etc.) are not described because conventional.
  • the drive member 30 occupies little space between the catch-up lever 8 and the split core 14, the occupied space corresponding only to the thickness of the blade 30, 34, 35. Consequently, the size of the split core 14, in particular its length (distance between its shoulders 14b and its top 14c), can be large - and notably greater than if the one-piece drive piece 28 had the conventional shape of a pin driven into the isolation wheel or assembled to the insulation wheel by another conventional method - while allowing the drive member 30 to be located radially beyond the path traveled by the top 14c of the catching heart 14 not to be struck by said top 14c when the split wheel 1 is stopped and the chronograph axis 3 continues to rotate.
  • the increase in the size of the split core 14 allowed by the shape of the driving member 30 makes it possible to increase the moment exerted by the split-second lever 8 on the split-second core 14 at constant moment exerted by the spring. 9 on the retractor lever 8. It follows that the needle of catch-up will catch the chronograph hand faster after playing an intermediate time.
  • the increase in the size of the jumper core 14 may be used to reduce the moment exerted by the return spring 9 on the split-second lever 8 at constant moment exerted by the split-second lever 8 on the split-seconds core 14.
  • the moment (s) to be applied by the split-seconds pliers 22 on the split-second wheel 1 and / or by the isolation-control lever 26 on the insulating wheel 24 can be reduced, which is beneficial for the equilibrium of the forces at the split-second column wheel 15 and its jumper 19.
  • the force exerted by the catch-up lever 8 on the catch-up core 14 is lower, the forces of reaction to the pivots of the split-second shaft 2 during the synchronization of the split-second needle on the chronograph hand are reduced.
  • the maximum radial dimension D in any plane P perpendicular to the split-seconds 2 and chronograph 3 axes and passing through the split-core 14 and the driving member 30 is less than or equal to 0.25 mm, preferably less than or equal to 0.20 mm and more preferably equal to about 0.15 mm.
  • radial dimension is meant the dimension of the driving member 30 along a straight line perpendicularly intersecting the imaginary axis of common rotation A of the split-seconds 2 and chronograph 3 axes, of the split-second core 14 and wheels of
  • maximum radial dimension means, in a given plane P, the maximum of the radial dimension of the drive member 30 when the angular position of said straight line is varied. perpendicular to the imaginary axis of rotation A.
  • the example shown in figure 6 is that of a stud assembly 30 - insulation wheel 24 obtained by the LIGA process, the other two studs 30 'not being functional but used only to facilitate manufacture.
  • the one-piece character of the assembly 30, 24 makes it possible to obtain a drive member 30 having the radial dimension as mentioned above without causing any problem in keeping the drive member 30 on the wheel of insulation 24.
  • the drive member 30 is in the shape of a rectangular parallelepiped. It could nevertheless have another form, for example a cylindrical shape. In the latter case, the maximum radial dimension mentioned above would be the diameter of the cylinder.
  • the driving member 30 and the catch-up lever 8 are closer to the center of the catching core 14, that is to say of the imaginary axis of rotation A, that is the catch-up lever 8 (including its spout 13 or, alternatively, its roller), when the wheel 1 is stopped by the split-second gripper 22.
  • the drive member 30 is closer to the center of the catching core 14, that is to say the imaginary axis of rotation A, that is the return spring 9, when the 1 is stopped by the split-second gripper 22.
  • the driving member 30 keeps the split-second lever 8 away from the split-seconds core 14, if a center circle is drawn on the center or the imaginary axis of rotation A of the catching core 14 and that one gradually increases its radius, it is the drive member 30 that this circle will meet first. In this way, the space available for the split core 14 can be optimized. However, this feature is not mandatory.
  • a part of the catch-up lever 8 and / or of its return spring 9 may indeed be slightly closer to the center of the catchestrap core 14 than is the drive member 30.

Abstract

Le mécanisme de chronographe à rattrapante comprend une roue de rattrapante (1) solidaire d'un axe de rattrapante (2), un coeur de rattrapante (14) solidaire d'un axe de chronographe (3), un levier de rattrapante (8) porté par la roue de rattrapante (1), agencé pour coopérer avec le coeur de rattrapante (14) et soumis à l'action d'un ressort de rappel (9), un organe d'arrêt (22) pour arrêter ou libérer la roue de rattrapante (1), et un mécanisme isolateur (24-35) pour supprimer le contact entre le levier de rattrapante (8) et le coeur de rattrapante (14) lorsque la roue de rattrapante (1) est arrêtée par l'organe d'arrêt (22). Le mécanisme isolateur (24-35) comprend une roue d'isolation (24) coaxiale à la roue de rattrapante (1) et au coeur de rattrapante (14) et portant un organe d'entraînement (30) agencé pour agir sur le levier de rattrapante (8) contre l'action du ressort de rappel (9). L'organe d'entraînement (30) fait partie d'une pièce monobloc (28) comprenant, outre l'organe d'entraînement (30), un corps (29) s'étendant dans un plan perpendiculaire aux axes de rattrapante (2) et de chronographe (3), ce corps (29) formant la roue d'isolation (24) ou étant solidaire en rotation de la roue d'isolation (24). De plus, dans tout plan (P) perpendiculaire aux axes de rattrapante (2) et de chronographe (3) et traversant le coeur de rattrapante (14) et l'organe d'entraînement (30), la dimension radiale (D) maximale de l'organe d'entraînement (30) est inférieure ou égale à 0,25 mm.The split-second chronograph mechanism comprises a split-second wheel (1) integral with a split-seconds shaft (2), a split-seconds core (14) integral with a chronograph-axis (3), a split-seconds lever (8) carried by the catching wheel (1), arranged to cooperate with the catching core (14) and subjected to the action of a return spring (9), a stop member (22) to stop or release the a split-second wheel (1), and an isolating mechanism (24-35) for suppressing the contact between the split-second lever (8) and the split-second core (14) when the split-second wheel (1) is stopped by the member stop (22). The isolator mechanism (24-35) comprises an isolation wheel (24) coaxial with the split-second wheel (1) and the split-second core (14) and carrying a driving member (30) arranged to act on the lever catches (8) against the action of the return spring (9). The driving member (30) is part of a one-piece piece (28) comprising, in addition to the driving member (30), a body (29) extending in a plane perpendicular to the split-second axes (2). ) and chronograph (3), this body (29) forming the insulation wheel (24) or being rotationally integral with the insulation wheel (24). In addition, in any plane (P) perpendicular to the split-seconds (2) and chronograph (3) axes and passing through the catch-up core (14) and the drive member (30), the maximum radial dimension (D) of the driving member (30) is less than or equal to 0.25 mm.

Description

La présente invention concerne un mécanisme de chronographe à rattrapante.The present invention relates to a split-second chronograph mechanism.

Dans un chronographe, une aiguille indicatrice dite aiguille de chronographe peut être successivement mise en mouvement, arrêtée et remise à zéro à la demande de l'utilisateur pour mesurer des durées. A cet effet, l'utilisateur dispose de boutons-poussoirs faisant saillie sur le pourtour de la boîte du chronographe.In a chronograph, a pointer needle called chronograph hand can be successively set in motion, stopped and reset at the request of the user to measure durations. For this purpose, the user has pushbuttons projecting around the periphery of the chronograph box.

Certains chronographes comprennent un mécanisme additionnel permettant de commander une deuxième aiguille, dite aiguille de rattrapante. Au démarrage du chronographe les deux aiguilles sont superposées et tournent ensemble. Une pression de l'utilisateur sur un bouton-poussoir de rattrapante arrête l'aiguille de rattrapante tandis que l'aiguille de chronographe continue à tourner. L'utilisateur peut ainsi lire le temps intermédiaire indiqué par l'aiguille de rattrapante. Une deuxième pression sur le bouton-poussoir de rattrapante permet à l'aiguille de rattrapante de se réaligner sur l'aiguille de chronographe puis de tourner avec cette dernière, les deux aiguilles restant alors superposées. Les deux aiguilles peuvent aussi être ensemble arrêtées et remises à zéro.Some chronographs include an additional mechanism for controlling a second needle, called a split-second needle. At the start of the chronograph the two hands are superimposed and rotate together. User pressure on a split-second push-button stops the split-second hand while the chronograph hand continues to rotate. The user can thus read the intermediate time indicated by the split-seconds hand. A second press on the split-second push-button allows the split-seconds hand to realign on the chronograph hand and then to turn with the latter, the two hands then remaining superimposed. The two needles can also be set together and reset.

Un tel mécanisme de rattrapante comprend une roue de rattrapante solidaire d'un axe qui porte l'aiguille de rattrapante. Un levier de rattrapante monté sur la roue de rattrapante et soumis à l'action d'un ressort de rappel coopère avec un coeur de rattrapante solidaire de l'axe qui porte l'aiguille de chronographe, pour solidariser les aiguilles de chronographe et de rattrapante pendant la mesure d'un temps intermédiaire et permettre à l'aiguille de rattrapante de se réaligner sur l'aiguille de chronographe après la mesure et la lecture du temps intermédiaire. Une pince de rattrapante commandée par le bouton-poussoir de rattrapante arrête ou libère la roue de rattrapante en pinçant ou relâchant le pourtour de la roue de rattrapante.Such a catch-up mechanism comprises a catch-up wheel integral with an axis which carries the catch-up needle. A catch-up lever mounted on the catch-up wheel and subjected to the action of a return spring cooperates with a catch-up core integral with the axis which carries the chronograph hand, to secure the chronograph and split-seconds hands. during the measurement of an intermediate time and allow the split-seconds hand to realign on the chronograph hand after the measurement and playback of the split time. A split-second gripper controlled by the split-second push-button stops or releases the split-second wheel by pinching or loosening the periphery of the split-second wheel.

Certains mécanismes de rattrapante comprennent en outre un isolateur, c'est-à-dire un dispositif conçu pour supprimer le contact entre le levier et le coeur de rattrapante lorsque la roue de rattrapante est arrêtée par la pince de rattrapante. Un tel isolateur permet d'éviter toute perturbation de la marche du chronographe due à la coopération entre le levier et le coeur de rattrapante. Il comprend généralement une roue d'isolation coaxiale à la roue de rattrapante et au coeur de rattrapante. Une goupille chassée dans la roue d'isolation n'agit pas sur le levier de rattrapante lorsque la pince de rattrapante laisse la roue de rattrapante libre mais écarte le levier de rattrapante du coeur de rattrapante lorsque la pince de rattrapante arrête la roue de rattrapante. Des exemples d'isolateur sont décrits dans les documents CH 686545 et CH 705614 .Some catch-up mechanisms further comprise an insulator, that is to say a device designed to eliminate the contact between the lever and the split-core when the split-second wheel is stopped by the split-seconds pliers. Such an isolator makes it possible to avoid any disturbance of the chronograph operation due to the cooperation between the lever and the split-second heart. It generally includes an insulation wheel coaxial with the split-second wheel and the split-seconds heart. A pin driven into the isolation wheel does not act on the split lever when the split-seconds plier leaves the split-second wheel free but moves the split-second lever away from the split-second-half when the split-seconds-clip stops the split-second wheel. Examples of isolator are described in the documents CH 686545 and CH 705614 .

Dans un mécanisme de chronographe à rattrapante à isolateur, le levier de rattrapante, son ressort de rappel et la goupille chassée dans la roue d'isolation délimitent l'espace laissé à disposition du coeur de rattrapante pour sa rotation lorsque le levier de rattrapante est écarté du coeur de rattrapante. Le chemin que parcourt le sommet du coeur de rattrapante ne doit en effet être interrompu ni par le levier de rattrapante ni par son ressort de rappel ni encore par la goupille. Il en découle que le choix de la taille du coeur de rattrapante dépend de la configuration et de la position desdits levier, ressort et goupille. Or, un coeur de grande taille est avantageux car à moment constant exercé par le ressort de rappel sur le levier de rattrapante le moment exercé par le levier de rattrapante sur le coeur de rattrapante est plus élevé ou, inversement, à moment constant exercé par le levier de rattrapante sur le coeur de rattrapante le moment exercé par le ressort de rappel sur le levier de rattrapante est moins élevé.In a split-second chronograph mechanism isolator, the split lever, its return spring and the pin driven into the insulation wheel delimit the space left available to the split core for its rotation when the split-second lever is removed from the heart of the rattrapante. The path that travels through the top of the heart of the jumper must indeed be interrupted by the split lever or by its return spring or by the pin. It follows that the choice of the size of the jumper core depends on the configuration and the position of said lever, spring and pin. However, a large core is advantageous because at constant moment exerted by the return spring on the catch-up lever the moment exerted by the catch-up lever on the catch-up core is higher or, conversely, at a constant moment exerted by the catch-up lever on the catch-up heart the moment exerted by the return spring on the split-lever is lower.

La présente invention vise à proposer un mécanisme de chronographe à rattrapante à isolateur dont le coeur de rattrapante peut avoir une plus grande taille que les coeurs des mécanismes connus.The present invention aims to propose an insulator split-second chronograph mechanism, the catch-up core of which may have a larger size than the cores of the known mechanisms.

A cette fin, il est prévu un mécanisme de chronographe à rattrapante, comprenant une roue de rattrapante solidaire d'un axe de rattrapante, un coeur de rattrapante solidaire d'un axe de chronographe, un levier de rattrapante porté par la roue de rattrapante, agencé pour coopérer avec le coeur de rattrapante et soumis à l'action d'un ressort de rappel, un organe d'arrêt pour arrêter ou libérer la roue de rattrapante, et un mécanisme isolateur pour supprimer le contact entre le levier de rattrapante et le coeur de rattrapante lorsque la roue de rattrapante est arrêtée par l'organe d'arrêt, le mécanisme isolateur comprenant une roue d'isolation coaxiale à la roue de rattrapante et au coeur de rattrapante et portant un organe d'entraînement agencé pour agir sur le levier de rattrapante contre l'action du ressort de rappel, caractérisé en ce que l'organe d'entraînement fait partie d'une pièce monobloc comprenant, outre l'organe d'entraînement, un corps s'étendant dans un plan perpendiculaire aux axes de rattrapante et de chronographe, ce corps formant la roue d'isolation ou étant solidaire en rotation de la roue d'isolation, et en ce que dans tout plan perpendiculaire aux axes de rattrapante et de chronographe et traversant le coeur de rattrapante et l'organe d'entraînement, la dimension radiale maximale de l'organe d'entraînement est inférieure ou égale à 0,25 mm.To this end, there is provided a split-second chronograph mechanism, comprising a split-second wheel integral with a split-second axis, a heart of catches integral with a chronograph axis, a catch-up lever carried by the catch-up wheel, arranged to cooperate with the catch-up heart and subjected to the action of a return spring, a stop member to stop or release the split wheel, and an isolator mechanism for suppressing contact between the split-second lever and the split-second core when the split-second wheel is stopped by the shut-off member, the isolating mechanism comprising an insulation wheel coaxial with the catching-up wheel and in the middle of a jumper and carrying a drive member arranged to act on the catch-up lever against the action of the return spring, characterized in that the driving member is part of a one-piece part comprising , in addition to the drive member, a body extending in a plane perpendicular to the split-seconds and chronograph axes, this body forming the insulation wheel or being rotationally secured to the iso wheel lation, and in that in any plane perpendicular to the axes of catching and chronograph and passing through the catching core and the drive member, the maximum radial dimension of the drive member is less than or equal to 0.25 mm.

Dans l'état de la technique, les goupilles chassées dans les roues d'isolation ont un diamètre supérieur à 0,30 mm, généralement égal à 0,40 mm. Ce grand diamètre est nécessaire pour la tenue de la goupille dans la roue d'isolation. Dans la présente invention, la réalisation de l'organe d'entraînement en tant que partie d'une pièce monobloc comprenant en outre un corps s'étendant dans un plan perpendiculaire aux axes de rattrapante et de chronographe permet de conférer à l'organe d'entraînement une dimension radiale inférieure, voire très inférieure, à celle d'une goupille d'entraînement conventionnelle. Dès lors, le coeur de rattrapante peut être agrandi tout en restant libre de tourner sans heurter l'organe d'entraînement lorsque ce dernier maintient le levier de rattrapante hors de contact avec le coeur de rattrapante. Le levier de rattrapante et son ressort de rappel peuvent être facilement adaptés, si nécessaire, pour se situer eux aussi au-delà du chemin parcouru par le sommet du coeur de rattrapante.In the state of the art, the pins driven in the insulating wheels have a diameter greater than 0.30 mm, generally equal to 0.40 mm. This large diameter is necessary for holding the pin in the insulation wheel. In the present invention, the embodiment of the drive member as part of a one-piece piece further comprising a body extending in a plane perpendicular to the split and chronograph axes allows to confer the body of The drive has a smaller radial dimension, or even much smaller, than that of a conventional drive pin. Therefore, the split core can be enlarged while remaining free to rotate without hitting the drive member when the latter maintains the catch-up lever out of contact with the split core. The catch-up lever and its return spring can be easily adapted, if necessary, to be located also beyond the path traveled by the top of the split-seconds heart.

De préférence, dans tout plan perpendiculaire aux axes de rattrapante et de chronographe et traversant le coeur de rattrapante et l'organe d'entraînement, la dimension radiale maximale de l'organe d'entraînement est inférieure ou égale à 0,20 mm.Preferably, in any plane perpendicular to the catches and chronograph axes and passing through the catching core and the drive member, the maximum radial dimension of the drive member is less than or equal to 0.20 mm.

De préférence également, le mécanisme de chronographe à rattrapante selon l'invention comprend au moins l'une des caractéristiques suivantes :

  1. (i) dans tout plan perpendiculaire aux axes de rattrapante et de chronographe et traversant le coeur de rattrapante, l'organe d'entraînement et le levier de rattrapante, l'organe d'entraînement est plus proche du centre du coeur de rattrapante que ne l'est le levier de rattrapante, lorsque la roue de rattrapante est arrêtée par l'organe d'arrêt,
  2. (ii) dans tout plan perpendiculaire aux axes de rattrapante et de chronographe et traversant le coeur de rattrapante, l'organe d'entraînement et le ressort de rappel, l'organe d'entraînement est plus proche du centre du coeur de rattrapante que ne l'est le ressort de rappel, lorsque la roue de rattrapante est arrêtée par l'organe d'arrêt.
Also preferably, the split-second chronograph mechanism according to the invention comprises at least one of the following characteristics:
  1. (i) in any plane perpendicular to the catches and chronograph axes and passing through the catching core, the driving member and the catch-up lever, the driving member is closer to the center of the jumper heart than is the catch-up lever, when the split wheel is stopped by the stop member,
  2. (ii) in any plane perpendicular to the catches and chronograph axes and passing through the catch-up core, the driving member and the return spring, the driving member is closer to the center of the split-second core than is the return spring, when the split wheel is stopped by the stop member.

L'organe d'entraînement est par exemple sensiblement en forme de parallélépipède rectangle.The drive member is for example substantially in the shape of a rectangular parallelepiped.

Dans des exemples de réalisation, l'organe d'entraînement est une portion d'une lame pliée formant ou faisant partie de la pièce monobloc.In exemplary embodiments, the driving member is a portion of a folded blade forming or forming part of the one-piece piece.

Dans d'autres exemples de réalisation, l'organe d'entraînement est monobloc avec la roue d'isolation.In other exemplary embodiments, the drive member is integral with the insulation wheel.

La présente invention propose en outre un chronographe comprenant un mécanisme de chronographe à rattrapante tel que défini ci-dessus.The present invention further provides a chronograph comprising a split-second chronograph mechanism as defined above.

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

  • les figures 1 et 2 sont des vues en coupe d'une partie d'un mécanisme de chronographe à rattrapante selon l'invention respectivement en position « pince ouverte » et en position « pince fermée » ;
  • les figures 3 et 4 sont des vues de dessus d'une partie du mécanisme de chronographe à rattrapante selon l'invention respectivement en position « pince ouverte » et en position « pince fermée » ;
  • la figure 5 est une vue de dessus d'une roue d'isolation faisant partie du mécanisme de chronographe à rattrapante selon l'invention et portant un organe d'entraînement de levier de rattrapante ;
  • la figure 6 est une vue en perspective d'une variante de la roue d'isolation portant un organe d'entraînement de levier de rattrapante.
Other features and advantages of the present invention will appear on reading the following detailed description given with reference to the accompanying drawings in which:
  • the figures 1 and 2 are cross-sectional views of a part of a split-second chronograph mechanism according to the invention respectively in the "open clamp" position and in the "closed clamp"position;
  • the figures 3 and 4 are views from above of a part of the split-second chronograph mechanism according to the invention respectively in the "open clamp" position and in the "closed clamp"position;
  • the figure 5 is a top view of an insulation wheel forming part of the split-second chronograph mechanism according to the invention and carrying a split-lever lever driving member;
  • the figure 6 is a perspective view of a variant of the isolation wheel carrying a split lever drive member.

En référence aux figures 1 à 4, un mécanisme de chronographe à rattrapante selon l'invention, destiné à faire partie d'un chronographe par exemple de type montre-bracelet, comprend une roue de rattrapante 1 solidaire d'un axe de rattrapante 2 destiné à porter une aiguille de rattrapante. L'axe de rattrapante 2 est un tube traversé longitudinalement par un axe de chronographe 3 destiné à porter une aiguille de chronographe (trotteuse). L'axe de chronographe 3 est solidaire d'une roue de chronographe (non représentée) ou relié à la roue de chronographe par un embrayage. L'axe de chronographe 3 est guidé dans des pierres 4, 5 montées respectivement dans la platine 6 du mouvement du chronographe et dans un pont de chronographe 7a. Sur la roue de rattrapante 1 sont montés un levier de rattrapante 8 et un ressort de rappel 9 agissant sur le levier de rattrapante 8. Le levier de rattrapante 8 pivote autour d'un pivot 10 et comprend un premier bras 11 sur lequel agit le ressort de rappel 9 et un deuxième bras 12 définissant un bec 13. Le ressort de rappel 9 tend à maintenir le bec 13 du levier de rattrapante 8 en contact avec le pourtour d'un coeur de rattrapante 14 solidaire de l'axe de chronographe 3. Dans des variantes, le bec 13 pourrait être remplacé par un galet monté sur le levier de rattrapante 8 pour pouvoir rouler sur le pourtour du coeur de rattrapante 14. La roue de rattrapante 1 est située axialement entre le coeur de rattrapante 14 et un pont de rattrapante 7b, ce dernier étant traversé par les axes de rattrapante et de chronographe 2, 3 et portant un tube 7c qui entoure lesdits axes 2, 3.With reference to Figures 1 to 4 , a split-second chronograph mechanism according to the invention, intended to be part of a chronograph, for example of the wristwatch type, comprises a split-second wheel 1 integral with a split-second shaft 2 intended to carry a split-second needle. The split axis 2 is a tube traversed longitudinally by a chronograph axis 3 intended to carry a chronograph hand (second hand). The chronograph axis 3 is integral with a chronograph wheel (not shown) or connected to the chronograph wheel by a clutch. The chronograph axis 3 is guided in stones 4, 5 respectively mounted in the plate 6 of the chronograph movement and in a chronograph bridge 7a. On the split wheel 1 are mounted a split lever 8 and a return spring 9 acting on the split lever 8. The split lever 8 pivots about a pivot 10 and comprises a first arm 11 on which the spring acts 9 and a second arm 12 defining a spout 13. The return spring 9 tends to maintain the spout 13 of the catch-up lever 8 in contact with the periphery of a catcher core 14 integral with the chronograph axis 3. In variants, the spout 13 could be replaced by a roller mounted on the split lever 8 to be able to roll around the periphery of the split core 14. The split wheel 1 is located axially between the catch-up core 14 and a jumper bridge 7b, the latter being crossed by the catches and chronograph axes 2, 3 and carrying a tube 7c which surrounds said pins 2, 3.

Le mécanisme de chronographe à rattrapante comprend en outre une roue à colonnes de rattrapante 15 comprenant sur un premier niveau un rochet 16 et sur un deuxième niveau une roue 17 définissant des colonnes 18 et solidaire du rochet 16. Le rochet 16 est maintenu en position entre deux rotations par un sautoir 19. Un organe de commande de rattrapante 20, actionnable par un bouton-poussoir de rattrapante (non représenté) accessible depuis l'extérieur du chronographe, coopère avec le rochet 16 pour déplacer la roue à colonnes 15 d'un angle prédéterminé à chaque pression sur le bouton-poussoir de rattrapante. Les colonnes 18 coopèrent avec un bec 21 de chaque bras d'une pince de rattrapante 22, de telle sorte que des rotations successives de la roue à colonnes 15 commandées par des pressions successives sur le bouton-poussoir de rattrapante ferment et ouvrent alternativement la pince de rattrapante 22 pour respectivement bloquer et libérer la roue de rattrapante 1. Lorsque la pince de rattrapante 22 est fermée, la roue de rattrapante 1 est immobilisée par friction entre des surfaces de friction 23 respectives des bras de la pince de rattrapante 22 et le pourtour de la roue de rattrapante 1. Lorsque la pince de rattrapante 22 est ouverte, les surfaces de friction 23 sont hors de contact avec la roue de rattrapante 1 et cette dernière est donc libre de tourner. Le pourtour de la roue de rattrapante 1 peut être muni d'un organe de friction 1a en caoutchouc naturel ou synthétique, comme représenté, pour augmenter la friction entre la pince de rattrapante 22 et la roue de rattrapante 1.The split-second chronograph mechanism further comprises a split-second column wheel 15 comprising on a first level a ratchet 16 and on a second level a wheel 17 defining columns 18 and integral with the ratchet 16. The ratchet 16 is held in position between two rotations by a jumper 19. A catch-up control member 20, operable by a catch-up push button (not shown) accessible from outside the chronograph, cooperates with the ratchet 16 to move the column wheel 15 of a predetermined angle with each press of the split-second push-button. The columns 18 cooperate with a spout 21 of each arm of a catch-up clamp 22, so that successive rotations of the column wheel 15 controlled by successive presses on the split-second push-button close and open the clamp alternately. 22, the clutch wheel 22 is closed, the clutch wheel 1 is immobilized by friction between the respective friction surfaces 23 of the arms of the split-seconds pliers 22 and the periphery. of the split wheel 1. When the splitter clamp 22 is open, the friction surfaces 23 are out of contact with the split wheel 1 and the latter is free to rotate. The periphery of the split wheel 1 may be provided with a friction member 1a of natural or synthetic rubber, as shown, to increase the friction between the split-plier 22 and the split-second wheel 1.

Au démarrage du chronographe, la pince de rattrapante 22 est en position ouverte et le bec 13 du levier de rattrapante 8 est dans l'échancrure 14a du coeur de rattrapante 14, entre les deux épaules 14b de ce dernier, ce qui solidarise la roue de rattrapante 1 et l'axe de chronographe 3 (cf. figure 3). Les aiguilles de chronographe et de rattrapante sont superposées et tournent ensemble. Lorsque la pince de rattrapante 22 est fermée par une action du bouton-poussoir de rattrapante via l'organe de commande de rattrapante 20 et la roue à colonnes 15 (cf. figure 4), la roue de rattrapante 1 et avec elle l'aiguille de rattrapante s'immobilisent tandis que l'axe de chronographe 3 et avec lui l'aiguille de chronographe continuent à tourner. Dès que la pince de rattrapante 22 est rouverte par une action du bouton-poussoir de rattrapante via l'organe de commande de rattrapante 20 et la roue à colonnes 15, la roue de rattrapante 1 est libérée et, par le contact entre le bec 13 du levier de rattrapante 8 et le pourtour du coeur de rattrapante 14 et la force exercée par le ressort de rappel 9 sur le levier de rattrapante 8, la roue de rattrapante 1 est tournée jusqu'à ce que le bec 13 retrouve l'échancrure 14a du coeur de rattrapante 14, position dans laquelle l'aiguille de rattrapante et l'aiguille de chronographe sont superposées.At the start of the chronograph, the split-seconds pliers 22 are in the open position and the spout 13 of the retracting lever 8 is in the recess 14a of the second-stage core 14, between the two shoulders 14b of the latter, which solidarises the wheel of catching 1 and the chronograph axis 3 (cf. figure 3 ). The chronograph and split-seconds hands are superimposed and rotate together. When the split-second gripper 22 is closed by an action of the push-button push-button via the split-second control member 20 and the column wheel 15 (cf. figure 4 ), the split wheel 1 and with it the catch-up needle stops while the chronograph axis 3 and with it the chronograph hand continue to rotate. As soon as the split-second gripper 22 is reopened by an action of the split-second push-button via the split-seconds control member 20 and the column wheel 15, the split-second wheel 1 is released and, by the contact between the spout 13 of the split-seconds lever 8 and the periphery of the split-second core 14 and the force exerted by the return spring 9 on the split-seconds lever 8, the split-second wheel 1 is turned until the spout 13 finds the cut-out 14 a of the split-second heart 14, a position in which the split-second hand and the chronograph hand are superimposed.

Le mécanisme de chronographe à rattrapante selon l'invention comprend en outre un mécanisme isolateur pour supprimer le contact entre le bec 13 du levier de rattrapante 8 et le coeur de rattrapante 14 lorsque la roue de rattrapante 1 est arrêtée par la pince de rattrapante 22. Ce mécanisme isolateur comprend une roue d'isolation 24 coaxiale à la roue de rattrapante 1 et au coeur de rattrapante 14 et montée folle autour de l'axe de rattrapante 2. La roue d'isolation 24 présente une denture à dents de loup que peut entraîner un bec 25 d'une bascule de commande d'isolation 26, dont un deuxième bec 27 coopère avec les colonnes 18 de la roue à colonnes 15. Une pièce d'entraînement monobloc 28 (cf. figures 1 et 5) est solidaire en rotation de la roue d'isolation 24. Cette pièce d'entraînement monobloc 28 comprend un corps 29 de forme plate s'étendant dans un plan perpendiculaire aux axes de rattrapante 2 et de chronographe 3 et donc parallèle aux roues de rattrapante 1 et d'isolation 24, et une partie saillante 30 s'étendant perpendiculairement au plan du corps 29. La partie saillante 30 constitue un organe d'entraînement agencé pour agir sur le levier de rattrapante 8, plus précisément sur son bras 12. Le corps 29 comprend une partie centrale 31 traversée par l'axe de rattrapante 2, deux oreilles 32 recevant des goupilles 33 servant à positionner la pièce d'entraînement monobloc 28 par rapport à la roue d'isolation 24 perpendiculairement aux axes de rattrapante 2 et de chronographe 3, et une portion 34 de lame pliée. Une partie d'extrémité libre de la lame pliée séparée de la portion 34 par une pliure 35 constitue l'organe d'entraînement 30. L'axe de rattrapante 2 peut avoir une fonction de guidage de la pièce d'entraînement monobloc 28. Dans ce cas, une seule oreille 32 et une seule goupille 33 peuvent être prévues pour le positionnement de la pièce d'entraînement monobloc 28 par rapport à la roue d'isolation 24. La pièce d'entraînement monobloc 28 est maintenue axialement avec un léger jeu entre la roue de rattrapante 1 et la roue d'isolation 24. En variante, toutefois, la pièce d'entraînement monobloc 28 pourrait être rigidement fixée à la roue d'isolation 24.The split-second chronograph mechanism according to the invention further comprises an isolator mechanism for eliminating the contact between the spout 13 of the split-seconds lever 8 and the split-seconds core 14 when the split-second wheel 1 is stopped by the split-seconds pliers 22. This isolator mechanism comprises an insulation wheel 24 coaxial with the split wheel 1 and the split core 14 and mounted idle about the split-second axis 2. The insulation wheel 24 has teeth with wolf teeth that can driving a spout 25 of an isolation control lever 26, a second spout 27 cooperates with the columns 18 of the column wheel 15. A one-piece drive piece 28 (cf. figures 1 and 5 ) is integral in rotation with the insulation wheel 24. This one-piece drive part 28 comprises a body 29 of flat shape extending in a plane perpendicular to the axes of split 2 and chronograph 3 and therefore parallel to the wheels of split-seconds 1 and insulation 24, and a projecting portion 30 extending perpendicular to the plane of the body 29. The projecting portion 30 is a drive member arranged to act on the split lever 8, more precisely on its arm 12. The body 29 comprises a central portion 31 crossed by the axis of split second 2, two ears 32 receiving pins 33 for positioning the one-piece driving part 28 relative to the insulation wheel 24 perpendicularly to the split-seconds 2 and chronograph 3-axes, and a portion 34 of folded blade. A free end portion of the folded blade separated from the portion 34 by a fold 35 constitutes the drive member 30. The split-second shaft 2 can have a function of guiding the one-piece drive part 28. In in this case, a single lug 32 and a single pin 33 can be provided for positioning the one-piece driving part 28 with respect to the insulating wheel 24. The one-piece driving part 28 is held axially with a slight clearance between the split wheel 1 and the insulation wheel 24. Alternatively, however, the one-piece driving part 28 could be rigidly fixed to the insulation wheel 24.

Comme visible sur les figures 1 et 2, les goupilles 33 s'étendent en hauteur jusque dans des évidements 36 que présente la roue de rattrapante 1. Pendant la rotation simultanée des aiguilles de chronographe et de rattrapante, une de ces goupilles 33 est poussée par un bras 37 de la roue de rattrapante 1 qui sépare deux évidements 36 (cf. figure 3), ce qui rend la roue d'isolation 24 solidaire de la roue de rattrapante 1. Dans cette configuration, l'organe d'entraînement 30 n'agit pas sur le levier de rattrapante 8. Lorsqu'une pression est appliquée sur l'organe de commande de rattrapante 20 faisant tourner la roue à colonnes 15, la pince de rattrapante 22 se ferme pour arrêter la roue de rattrapante 1 et la bascule de commande d'isolation 26, par son bec 25, fait tourner la roue d'isolation 24 d'un angle prédéterminé dans le sens de rotation de l'axe de chronographe 3 puis maintient en position la roue d'isolation 24 (cf. figure 4). Pendant ce mouvement, la pièce d'entraînement monobloc 28 solidaire en rotation de la roue d'isolation 24 se déplace de sa position de repos illustrée à la figure 3 à une position d'isolation illustrée à la figure 4, permettant à l'organe d'entraînement 30 d'écarter le levier de rattrapante 8 du coeur de rattrapante 14 contre l'action du ressort de rappel 9. De la sorte, l'aiguille de chronographe et l'axe de chronographe 3 peuvent continuer à tourner sans que le levier de rattrapante 8 puisse perturber leur rotation. Lorsqu'ensuite une pression est de nouveau appliquée sur l'organe de commande de rattrapante 20 faisant tourner la roue à colonnes 15, la pince de rattrapante 22 se rouvre pour libérer la roue de rattrapante 1 et, en même temps, la bascule de commande d'isolation 26 revient à sa position illustrée à la figure 3 en faisant tourner la roue d'isolation 24 dans le sens inverse du sens de rotation de l'axe de chronographe 3 pour qu'elle retrouve sa position initiale par rapport à la roue de rattrapante 1. Le levier de rattrapante 8 libéré par l'organe d'entraînement 30 retrouve le contact avec le coeur de rattrapante 14 sous l'action de son ressort de rappel 9 pour synchroniser l'aiguille de rattrapante avec l'aiguille de chronographe.As visible on figures 1 and 2 , the pins 33 extend in height into recesses 36 that the split wheel 1 presents. During the simultaneous rotation of the chronograph and split-seconds hands, one of these pins 33 is pushed by an arm 37 of the split-seconds wheel. 1 which separates two recesses 36 (cf. figure 3 ), which makes the insulation wheel 24 integral with the split wheel 1. In this configuration, the drive member 30 does not act on the split lever 8. When a pressure is applied on the splitter control member 20 rotating the column wheel 15, the split-second gripper 22 closes to stop the split-second wheel 1 and the isolation-control rocker 26, through its spout 25, turns the insulation wheel 24 a predetermined angle in the direction of rotation of the chronograph axis 3 and then maintains in position the insulation wheel 24 (cf. figure 4 ). During this movement, the one-piece drive piece 28 rotatably connected to the insulation wheel 24 moves from its rest position illustrated in FIG. figure 3 at an insulation position illustrated in the figure 4 , allowing the drive member 30 to move the catch-up lever 8 away from the take-off core 14 against the action of the return spring 9. In this way, the chronograph hand and the chronograph shaft 3 can continue to turn without the tweeter lever 8 can disrupt their rotation. When a pressure is then again applied on the split-second control member 20 rotating the column wheel 15, the split-second gripper 22 reopens to release the split wheel 1 and, at the same time, the control rocker insulation 26 returns to its position illustrated in FIG. figure 3 by rotating the insulation wheel 24 in the opposite direction to the direction of rotation of the chronograph axis 3 to return to its initial position relative to the split wheel 1. The split lever 8 released by the drive member 30 returns to contact with the catcher core 14 under the action of its return spring 9 to synchronize the split-second needle with the chronograph hand.

Les autres composants du mécanisme de chronographe selon l'invention (roue à colonnes de chronographe, dispositif d'embrayage, dispositif de remise à zéro, etc.) ne sont pas décrits car classiques.The other components of the chronograph mechanism according to the invention (chronograph column wheel, clutch device, reset device, etc.) are not described because conventional.

Grâce à la forme de l'organe d'entraînement 30, ce dernier occupe peu de place entre le levier de rattrapante 8 et le coeur de rattrapante 14, la place occupée correspondant uniquement à l'épaisseur de la lame 30, 34, 35. En conséquence, la taille du coeur de rattrapante 14, en particulier sa longueur (distance entre ses épaules 14b et son sommet 14c), peut être grande - et notamment plus grande que si la pièce d'entraînement monobloc 28 avait la forme conventionnelle d'une goupille chassée dans la roue d'isolation ou assemblée à la roue d'isolation par un autre procédé conventionnel - tout en permettant à l'organe d'entraînement 30 d'être situé radialement au-delà du chemin parcouru par le sommet 14c du coeur de rattrapante 14 pour ne pas être heurté par ledit sommet 14c lorsque la roue de rattrapante 1 est arrêtée et que l'axe de chronographe 3 continue à tourner.Due to the shape of the drive member 30, the latter occupies little space between the catch-up lever 8 and the split core 14, the occupied space corresponding only to the thickness of the blade 30, 34, 35. Consequently, the size of the split core 14, in particular its length (distance between its shoulders 14b and its top 14c), can be large - and notably greater than if the one-piece drive piece 28 had the conventional shape of a pin driven into the isolation wheel or assembled to the insulation wheel by another conventional method - while allowing the drive member 30 to be located radially beyond the path traveled by the top 14c of the catching heart 14 not to be struck by said top 14c when the split wheel 1 is stopped and the chronograph axis 3 continues to rotate.

L'augmentation de la taille du coeur de rattrapante 14 qu'autorise la forme de l'organe d'entraînement 30 permet d'augmenter le moment exercé par le levier de rattrapante 8 sur le coeur de rattrapante 14 à moment constant exercé par le ressort de rappel 9 sur le levier de rattrapante 8. Il s'ensuit que l'aiguille de rattrapante rattrapera plus vite l'aiguille de chronographe après la lecture d'un temps intermédiaire.The increase in the size of the split core 14 allowed by the shape of the driving member 30 makes it possible to increase the moment exerted by the split-second lever 8 on the split-second core 14 at constant moment exerted by the spring. 9 on the retractor lever 8. It follows that the needle of catch-up will catch the chronograph hand faster after playing an intermediate time.

Inversement, l'augmentation de la taille du coeur de rattrapante 14 peut être utilisée pour diminuer le moment exercé par le ressort de rappel 9 sur le levier de rattrapante 8 à moment constant exercé par le levier de rattrapante 8 sur le coeur de rattrapante 14. Dans ce cas, le(s) moment(s) à appliquer par la pince de rattrapante 22 sur la roue de rattrapante 1 et/ou par la bascule de commande d'isolation 26 sur la roue d'isolation 24 peuvent être diminués, ce qui est bénéfique pour l'équilibre des forces au niveau de la roue à colonnes de rattrapante 15 et de son sautoir 19. De plus, comme la force exercée par le levier de rattrapante 8 sur le coeur de rattrapante 14 est plus faible, les forces de réaction aux pivots de l'axe de rattrapante 2 lors de la synchronisation de l'aiguille de rattrapante sur l'aiguille de chronographe sont réduites. Les moments de frottement induits par ces forces de réaction sont donc eux aussi réduits. A moment constant exercé par le levier de rattrapante 8 sur le coeur de rattrapante 14 pour synchroniser l'aiguille de rattrapante sur l'aguille de chronographe (moment dit « restitué »), le moment dit « résistant » induit lorsque le levier de rattrapante 8 tombe sur le pourtour du coeur de rattrapante 14 ou lorsque le levier de rattrapante 8 heurte une des épaules 14b du coeur de rattrapante 14 est plus faible et permet ainsi une plus grande sécurité de fonctionnement dans le cas notamment où le dispositif d'embrayage du chronographe est de type vertical.Conversely, the increase in the size of the jumper core 14 may be used to reduce the moment exerted by the return spring 9 on the split-second lever 8 at constant moment exerted by the split-second lever 8 on the split-seconds core 14. In this case, the moment (s) to be applied by the split-seconds pliers 22 on the split-second wheel 1 and / or by the isolation-control lever 26 on the insulating wheel 24 can be reduced, which is beneficial for the equilibrium of the forces at the split-second column wheel 15 and its jumper 19. Moreover, since the force exerted by the catch-up lever 8 on the catch-up core 14 is lower, the forces of reaction to the pivots of the split-second shaft 2 during the synchronization of the split-second needle on the chronograph hand are reduced. The friction moments induced by these reaction forces are therefore also reduced. At a constant moment exerted by the catch-up lever 8 on the split-second core 14 to synchronize the split-second needle on the chronograph needle ("restituted" moment), the so-called "resistant" moment induced when the split-second lever 8 falls on the periphery of the split-seconds heart 14 or when the catch-up lever 8 strikes one of the shoulders 14b of the catch-up core 14 is weaker and thus allows greater operational safety especially in the case where the chronograph clutch device is vertical type.

Dans la présente invention, la dimension radiale D maximale dans tout plan P perpendiculaire aux axes de rattrapante 2 et de chronographe 3 et traversant le coeur de rattrapante 14 et l'organe d'entraînement 30 est inférieure ou égale à 0,25 mm, de préférence inférieure ou égale à 0,20 mm et de préférence encore égale à environ 0,15 mm. Par « dimension radiale » on entend la dimension de l'organe d'entraînement 30 le long d'une droite coupant de manière perpendiculaire l'axe imaginaire de rotation commun A des axes de rattrapante 2 et de chronographe 3, du coeur de rattrapante 14 et des roues de rattrapante 1 et d'isolation 24. Par « dimension radiale maximale » on entend, dans un plan P donné, le maximum de la dimension radiale de l'organe d'entraînement 30 lorsque l'on fait varier la position angulaire de ladite droite coupant de manière perpendiculaire l'axe imaginaire de rotation A.In the present invention, the maximum radial dimension D in any plane P perpendicular to the split-seconds 2 and chronograph 3 axes and passing through the split-core 14 and the driving member 30 is less than or equal to 0.25 mm, preferably less than or equal to 0.20 mm and more preferably equal to about 0.15 mm. By "radial dimension" is meant the dimension of the driving member 30 along a straight line perpendicularly intersecting the imaginary axis of common rotation A of the split-seconds 2 and chronograph 3 axes, of the split-second core 14 and wheels of The term "maximum radial dimension" means, in a given plane P, the maximum of the radial dimension of the drive member 30 when the angular position of said straight line is varied. perpendicular to the imaginary axis of rotation A.

La figure 6 montre un autre exemple de réalisation de l'organe d'entraînement 30. Dans cet exemple, l'organe d'entraînement 30 est sous la forme d'un plot faisant saillie sur la face de la roue d'isolation 24 située en regard de la roue de rattrapante 1. Ce plot 30 est monobloc avec la roue d'isolation 24, c'est-à-dire que les éléments 30, 24 ne peuvent être séparés sans causer de destruction. L'ensemble plot 30 - roue d'isolation 24 peut être obtenu par exemple par:

  • usinage, par exemple fraisage ou emboutissage, d'un bloc de matière,
  • gravure d'un substrat selon par exemple la technique de gravure ionique réactive profonde DRIE,
  • mise en oeuvre du procédé LIGA (lithographie, électroformage, moulage), ou
  • formation de la roue d'isolation 24, par exemple par DRIE, puis dépôt de matière, par exemple électrolytique, pour former le plot 30 ; dans ce cas, les matériaux de la roue d'isolation 24 et du plot 30 peuvent être différents ; la roue d'isolation 24 peut par exemple être en silicium et le plot 30 en un métal tel que le nickel.
The figure 6 shows another embodiment of the drive member 30. In this example, the drive member 30 is in the form of a stud projecting from the face of the insulation wheel 24 located opposite the split wheel 1. This stud 30 is in one piece with the insulation wheel 24, that is to say that the elements 30, 24 can not be separated without causing destruction. The set 30 - insulating wheel 24 can be obtained for example by:
  • machining, for example milling or stamping, of a block of material,
  • etching of a substrate according to for example the DRIE deep reactive ion etching technique,
  • implementation of the LIGA process (lithography, electroforming, molding), or
  • forming the insulation wheel 24, for example by DRIE, then deposition of material, for example electrolytic, to form the stud 30; in this case, the materials of the insulation wheel 24 and the pad 30 may be different; the insulation wheel 24 may for example be silicon and the pad 30 of a metal such as nickel.

L'exemple illustré à la figure 6 est celui d'un ensemble plot 30 - roue d'isolation 24 obtenu par le procédé LIGA, les deux autres plots 30' n'étant pas fonctionnels mais servant uniquement à faciliter la fabrication.The example shown in figure 6 is that of a stud assembly 30 - insulation wheel 24 obtained by the LIGA process, the other two studs 30 'not being functional but used only to facilitate manufacture.

Le caractère monobloc de l'ensemble 30, 24 permet l'obtention d'un organe d'entraînement 30 ayant la dimension radiale telle que mentionnée plus haut sans causer de problème de tenue de l'organe d'entraînement 30 sur la roue d'isolation 24.The one-piece character of the assembly 30, 24 makes it possible to obtain a drive member 30 having the radial dimension as mentioned above without causing any problem in keeping the drive member 30 on the wheel of insulation 24.

Dans les exemples illustrés aux figures 1 à 6, l'organe d'entraînement 30 est en forme de parallélépipède rectangle. Il pourrait néanmoins avoir une autre forme, par exemple une forme cylindrique. Dans ce dernier cas, la dimension radiale maximale précitée serait le diamètre du cylindre.In the examples illustrated in Figures 1 to 6 , the drive member 30 is in the shape of a rectangular parallelepiped. It could nevertheless have another form, for example a cylindrical shape. In the latter case, the maximum radial dimension mentioned above would be the diameter of the cylinder.

De préférence, dans tout plan perpendiculaire aux axes de rattrapante 2 et de chronographe 3 et traversant le coeur de rattrapante 14, l'organe d'entraînement 30 et le levier de rattrapante 8, l'organe d'entraînement 30 est plus proche du centre du coeur de rattrapante 14, c'est-à-dire de l'axe imaginaire de rotation A, que ne l'est le levier de rattrapante 8 (y compris son bec 13 ou, en variante, son galet), lorsque la roue de rattrapante 1 est arrêtée par la pince de rattrapante 22. De même, de préférence, dans tout plan perpendiculaire aux axes de rattrapante 2 et de chronographe 3 et traversant le coeur de rattrapante 14, l'organe d'entraînement 30 et le ressort de rappel 9, l'organe d'entraînement 30 est plus proche du centre du coeur de rattrapante 14, c'est-à-dire de l'axe imaginaire de rotation A, que ne l'est le ressort de rappel 9, lorsque la roue de rattrapante 1 est arrêtée par la pince de rattrapante 22. En d'autres termes, dans chaque plan précité et dans la configuration illustrée à la figure 4 où la roue de rattrapante 1 est arrêtée par la pince de rattrapante 22 et où l'organe d'entraînement 30 maintient le levier de rattrapante 8 éloigné du coeur de rattrapante 14, si l'on dessine un cercle de centre situé sur le centre ou axe imaginaire de rotation A du coeur de rattrapante 14 et que l'on augmente progressivement son rayon, c'est l'organe d'entraînement 30 que ce cercle rencontrera en premier. De cette manière, l'espace disponible pour le coeur de rattrapante 14 peut être optimisé. Toutefois cette caractéristique n'est pas obligatoire. Une partie du levier de rattrapante 8 et/ou de son ressort de rappel 9 peut en effet être légèrement plus proche du centre du coeur de rattrapante 14 que ne l'est l'organe d'entraînement 30.Preferably, in any plane perpendicular to the catches 2 and chronograph 3 axes and passing through the catching core 14, the driving member 30 and the catch-up lever 8, the driving member 30 is closer to the center of the catching core 14, that is to say of the imaginary axis of rotation A, that is the catch-up lever 8 (including its spout 13 or, alternatively, its roller), when the wheel 1 is stopped by the split-second gripper 22. Likewise, preferably, in any plane perpendicular to the split-seconds 2 and chronograph 3-axes and passing through the split-seconds core 14, the driving member 30 and the spring of FIG. 9, the drive member 30 is closer to the center of the catching core 14, that is to say the imaginary axis of rotation A, that is the return spring 9, when the 1 is stopped by the split-second gripper 22. In other words, in each plane mentioned above and in the configuration illustrated in the figure 4 where the split wheel 1 is stopped by the split-seconds pliers 22 and the driving member 30 keeps the split-second lever 8 away from the split-seconds core 14, if a center circle is drawn on the center or the imaginary axis of rotation A of the catching core 14 and that one gradually increases its radius, it is the drive member 30 that this circle will meet first. In this way, the space available for the split core 14 can be optimized. However, this feature is not mandatory. A part of the catch-up lever 8 and / or of its return spring 9 may indeed be slightly closer to the center of the catchestrap core 14 than is the drive member 30.

Claims (8)

Mécanisme de chronographe à rattrapante, comprenant une roue de rattrapante (1) solidaire d'un axe de rattrapante (2), un coeur de rattrapante (14) solidaire d'un axe de chronographe (3), un levier de rattrapante (8) porté par la roue de rattrapante (1), agencé pour coopérer avec le coeur de rattrapante (14) et soumis à l'action d'un ressort de rappel (9), un organe d'arrêt (22) pour arrêter ou libérer la roue de rattrapante (1), et un mécanisme isolateur (24-35) pour supprimer le contact entre le levier de rattrapante (8) et le coeur de rattrapante (14) lorsque la roue de rattrapante (1) est arrêtée par l'organe d'arrêt (22), le mécanisme isolateur (24-35) comprenant une roue d'isolation (24) coaxiale à la roue de rattrapante (1) et au coeur de rattrapante (14) et portant un organe d'entraînement (30) agencé pour agir sur le levier de rattrapante (8) contre l'action du ressort de rappel (9), caractérisé en ce que l'organe d'entraînement (30) fait partie d'une pièce monobloc (28) comprenant, outre l'organe d'entraînement (30), un corps (29) s'étendant dans un plan perpendiculaire aux axes de rattrapante (2) et de chronographe (3), ce corps (29) formant la roue d'isolation (24) ou étant solidaire en rotation de la roue d'isolation (24), et en ce que dans tout plan (P) perpendiculaire aux axes de rattrapante (2) et de chronographe (3) et traversant le coeur de rattrapante (14) et l'organe d'entraînement (30), la dimension radiale (D) maximale de l'organe d'entraînement (30) est inférieure ou égale à 0,25 mm.Split-second chronograph mechanism, comprising a split-second wheel (1) integral with a split-second shaft (2), a split-seconds core (14) integral with a chronograph-axis (3), a split-seconds lever (8) carried by the catching wheel (1), arranged to cooperate with the catching core (14) and subjected to the action of a return spring (9), a stop member (22) to stop or release the a split-second wheel (1), and an isolating mechanism (24-35) for suppressing the contact between the split-second lever (8) and the split-second core (14) when the split-second wheel (1) is stopped by the member stopper (22), the isolator mechanism (24-35) comprising an isolation wheel (24) coaxial with the catwalk wheel (1) and the catcher core (14) and carrying a drive member (30). ) arranged to act on the split lever (8) against the action of the return spring (9), characterized in that the drive member (30) is part of a e monobloc (28) comprising, in addition to the driving member (30), a body (29) extending in a plane perpendicular to the axes of split-seconds (2) and chronograph (3), this body (29) forming the insulation wheel (24) or being integral in rotation with the insulation wheel (24), and in that in any plane (P) perpendicular to the catching (2) and chronograph (3) axes and passing through the the split core (14) and the drive member (30), the maximum radial dimension (D) of the drive member (30) is less than or equal to 0.25 mm. Mécanisme de chronographe à rattrapante selon la revendication 1, caractérisé en ce que dans tout plan (P) perpendiculaire aux axes de rattrapante (2) et de chronographe (3) et traversant le coeur de rattrapante (14) et l'organe d'entraînement (30), la dimension radiale (D) maximale de l'organe d'entraînement (30) est inférieure ou égale à 0,20 mm.Split-second chronograph mechanism according to claim 1, characterized in that in any plane (P) perpendicular to the catches (2) and chronograph (3) axes and passing through the split-seconds heart (14) and the drive member (30), the maximum radial dimension (D) of the drive member (30) is less than or equal to 0.20 mm. Mécanisme de chronographe à rattrapante selon la revendication 1 ou 2, caractérisé en ce que dans tout plan perpendiculaire aux axes de rattrapante (2) et de chronographe (3) et traversant le coeur de rattrapante (14), l'organe d'entraînement (30) et le levier de rattrapante (8), l'organe d'entraînement (30) est plus proche du centre du coeur de rattrapante (14) que ne l'est le levier de rattrapante (8), lorsque la roue de rattrapante (1) est arrêtée par l'organe d'arrêt (22).Split-second chronograph mechanism according to claim 1 or 2, characterized in that in any plane perpendicular to the split-seconds (2) and chronograph (3) axes and passing through the split-second core (14), the drive member ( 30) and the split lever (8), the drive member (30) is closer to the center of the split core (14) than is the shift lever (8) when the split-second wheel (1) is stopped by the stop member (22). Mécanisme de chronographe à rattrapante selon l'une quelconque des revendications 1 à 3, caractérisé en ce que dans tout plan perpendiculaire aux axes de rattrapante (2) et de chronographe (3) et traversant le coeur de rattrapante (14), l'organe d'entraînement (30) et le ressort de rappel (9), l'organe d'entraînement (30) est plus proche du centre du coeur de rattrapante (14) que ne l'est le ressort de rappel (9), lorsque la roue de rattrapante (1) est arrêtée par l'organe d'arrêt (22).Split-second chronograph mechanism according to any one of claims 1 to 3, characterized in that in any plane perpendicular to the catching (2) and chronograph (3) axes and passing through the catching core (14), the body drive (30) and the return spring (9), the drive member (30) is closer to the center of the jumper core (14) than is the return spring (9) when the catching wheel (1) is stopped by the stop member (22). Mécanisme de chronographe à rattrapante selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'organe d'entraînement (30) est sensiblement en forme de parallélépipède rectangle.Split-second chronograph mechanism according to any one of claims 1 to 4, characterized in that the drive member (30) is substantially in the shape of a rectangular parallelepiped. Mécanisme de chronographe à rattrapante selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'organe d'entraînement (30) est une portion d'une lame pliée (30, 34, 35) formant ou faisant partie de la pièce monobloc (28).A split-second chronograph mechanism according to any one of claims 1 to 5, characterized in that the driving member (30) is a portion of a folded blade (30, 34, 35) forming or forming part of the monobloc piece (28). Mécanisme de chronographe à rattrapante selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'organe d'entraînement (30) est monobloc avec la roue d'isolation (24).Split-second chronograph mechanism according to any one of claims 1 to 5, characterized in that the drive member (30) is integral with the insulating wheel (24). Chronographe comprenant un mécanisme de chronographe à rattrapante selon l'une quelconque des revendications 1 à 7.Chronograph comprising a split-second chronograph mechanism according to any one of claims 1 to 7.
EP15200812.4A 2015-12-17 2015-12-17 Chronograph mechanism with fly-back hand with insulator Active EP3182229B1 (en)

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Application Number Priority Date Filing Date Title
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EP4202577A1 (en) * 2021-12-21 2023-06-28 Manufacture d'Horlogerie Audemars Piguet SA Lever device for a timepiece movement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH686545B5 (en) 1994-04-07 1996-10-31 Patek Philippe Sa Chronograph insulator.
CH705614A2 (en) 2011-10-06 2013-04-15 Patek Philippe Sa Geneve Fly-back lever and fly-back heart assembly for use in fly-back mechanism in stop watch, has fly-back heart whose peripheral surface is located opposite to point that comprises recess in which pin is fixed without touching fly-back heart
EP2897002A2 (en) * 2014-01-16 2015-07-22 Richemont International S.A. Insulating adjustment mechanism and mechanical timepiece comprising a chronograph mechanism provided with said insulating adjustment mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH686545B5 (en) 1994-04-07 1996-10-31 Patek Philippe Sa Chronograph insulator.
CH705614A2 (en) 2011-10-06 2013-04-15 Patek Philippe Sa Geneve Fly-back lever and fly-back heart assembly for use in fly-back mechanism in stop watch, has fly-back heart whose peripheral surface is located opposite to point that comprises recess in which pin is fixed without touching fly-back heart
EP2897002A2 (en) * 2014-01-16 2015-07-22 Richemont International S.A. Insulating adjustment mechanism and mechanical timepiece comprising a chronograph mechanism provided with said insulating adjustment mechanism

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