EP3734372B1 - Betätigungsvorrichtung eines zahnrads in einem uhrwerksmechanismus - Google Patents

Betätigungsvorrichtung eines zahnrads in einem uhrwerksmechanismus Download PDF

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Publication number
EP3734372B1
EP3734372B1 EP19172297.4A EP19172297A EP3734372B1 EP 3734372 B1 EP3734372 B1 EP 3734372B1 EP 19172297 A EP19172297 A EP 19172297A EP 3734372 B1 EP3734372 B1 EP 3734372B1
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EP
European Patent Office
Prior art keywords
pawl
tooth
pivot point
driven
beak
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.)
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Application number
EP19172297.4A
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English (en)
French (fr)
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EP3734372A1 (de
Inventor
Lukas Gisler
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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Application filed by Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP19172297.4A priority Critical patent/EP3734372B1/de
Publication of EP3734372A1 publication Critical patent/EP3734372A1/de
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Publication of EP3734372B1 publication Critical patent/EP3734372B1/de
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
    • G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
    • G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped
    • G04B19/253—Driving or releasing mechanisms
    • G04B19/25333—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement
    • G04B19/25353—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork 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

Definitions

  • the present invention relates to a device for actuating a toothed wheel of a timepiece mechanism by driving a tooth to be driven from said toothed wheel, as defined in the appended claims.
  • Such an actuation device is generally used to drive a toothed wheel such as a star wheel.
  • these wheels or stars may have a large number of teeth, that is to say greater than or equal to 20, for example 24, 31 teeth or even more.
  • a chronograph mechanism for a wheel of an hour counter actuated once per hour by a rocker and which can comprise 24 teeth.
  • a star with 31 teeth is used to indicate the dates, this star being actuated once a day by a rocker.
  • a moon phase mechanism one can use, as an indicator of the phases of the moon over two lunations, a star of 59 teeth driven by one step per day.
  • a week-day mechanism indicating the number of the week of the year, a 53-tooth star is used.
  • the present invention aims to remedy the drawbacks of the known actuating mechanisms of a toothed wheel by proposing an actuating device making it possible to guarantee optimum torque transmission by working with a tooth close to the center line even if the toothed wheel includes a large number of teeth.
  • Another object of the present invention is to propose a device for actuating a toothed wheel making it possible to eliminate any slipping in or out between the actuating rocker and the toothed wheel.
  • the present invention relates to a device for actuating a toothed wheel of a watch mechanism by driving a tooth to be driven from said toothed wheel, said actuating device comprising an actuating rocker arranged to pivot at a first pivot point between an initial position and a maximum driving position of said tooth to be driven.
  • said actuating device comprises a pawl mounted free in rotation on said actuating rocker at a second pivot point, said pawl comprising a beak arranged to drive said tooth to be driven and a guide, as well as means guide arranged to cooperate with said guide when the actuating rocker moves between its initial position and its maximum drive position, said guide means being configured to positioning the pawl in a position of avoidance of a front tooth which precedes the tooth to be driven, according to which the distance from the nose of the pawl to the first pivot point is strictly less than the distance from the top of the said front tooth to the first point of pivoting, at least when the pawl nose passes the apex of the front tooth, and then to pivot the pawl relative to the second pivot point towards the sprocket into a position of engagement between the front tooth and the tooth to be driven, in which the distance from the beak to the first pivot point has increased with respect to the avoidance position, with a view to the gripping of the tooth to be driven by
  • the actuation device makes it possible to work with the tooth located closest to the center line in order to guarantee optimum torque transmission while ensuring good grip with the tooth to be driven as well as good avoidance safety of the front tooth, even with a wheel having a large number of teeth.
  • the actuation device according to the invention makes it possible to guarantee engagement of the pawl in the toothing as well as its disengagement without slipping.
  • the present invention also relates to a timepiece comprising an actuation device as defined above.
  • the present invention relates to a device 1 for actuating a toothed wheel 2 of a timepiece mechanism (not shown).
  • the toothed wheel 2 comprises 31 teeth and constitutes a date star of a date mechanism, actuated once a day by the actuating device 1, by driving a tooth to drive 3.
  • the actuating device 1 comprises an actuating rocker 4 formed of an arm, at the free end of which is mounted a pawl 6.
  • the rocker 4 is pivotally mounted on a frame element of the mechanism in one first pivot point A.
  • the rocker 4 is arranged to pivot between an initial position, when it is at rest and does not actuate the wheel 2, and a maximum drive position in which the driven by the pawl 6 is maximum .
  • the pawl 6 is mounted loose, or free in rotation, without friction, on said actuating rocker 4 at a second pivot point B.
  • the pawl 6 comprises a beak 8 arranged to cause the tooth to be driven 3 as well as a guide 10 whose role will be detailed below.
  • the guide 10 may for example be a pin fixed to the pawl 6.
  • the pawl 6 very roughly has a triangular shape, the first vertex of which is constituted by the beak 8, the second vertex being occupied by the pivot point B, and the guide 10 being fixed on the third vertex.
  • the actuating device 1 also comprises guide means arranged to cooperate with the guide 10 of the pawl 6 when the rocker actuation 4 moves between its initial position and its maximum drive position.
  • said guide means are configured to position the pawl 6 in a position of avoidance of a front tooth 12 which precedes by one step the tooth to be driven 3, avoidance position in which the beak 8 is remote from said front tooth 12 so that the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A of the rocker 4 is strictly less, is preferably much less, than the distance d2 from the top of the said tooth front 12 to the first pivot point A, at least when the beak 8 of the pawl 6 passes the top of the front tooth 12.
  • the difference between the distance d2 from the top of the said front tooth 12 to the first pivot point A and the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A is called the avoidance safety SE.
  • said guide means are configured so that, when the beak 8 of the pawl 6 passes the top of the front tooth 12, the pawl 6 being in the avoidance position, the avoidance safety SE of the front tooth 12 is greater than the difference between the distance d2 from the top of the front tooth 12 to the first pivot point A and the distance d3 from the top of the leading tooth 3 to the first pivot point A.
  • the guide means are configured so that, when the beak 8 passes the top of the front tooth 12, the pawl 6 being in the avoidance position, the avoidance security SE of the front tooth 12 is greater than 0.2 mm, preferably 0.3 mm.
  • the value of the SE avoidance safety device will be revised upwards.
  • the guide means are also configured to then cause the pawl 6 to pivot with respect to the second pivot point B in the direction of the toothed wheel 2 in a position of engagement between the front tooth 12 and the tooth to be driven 3, according to which the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A of the rocker 4 has increased with respect to the distance d1 from the avoidance position, in order to position the beak 8 of the pawl 6 between the front tooth 12 and the tooth to be driven 3, with a view to the taking of the tooth to be driven 3 by the beak 8 of the pawl 6 for its training, as shown in figure 2 .
  • the distance d1 increases so that the beak 8 of the pawl is sufficiently engaged between the front tooth 12 and the tooth to be driven 3 early enough in order to have a security grip of the tooth to be driven 3 sufficient to allow a good grip with the tooth to be driven 3.
  • the safety of grip SP of the tooth to be driven 3 is defined as being the difference between the distance d1 from the top of the beak 8 of the pawl 6 to the first pivot point A and the distance d3 from the apex of leading tooth 3 at first pivot point A.
  • the guide means are configured so that, when the pawl 6 is in the engagement position, the safety grip SP with the tooth to be driven 3 is greater than or equal to the difference between the distance d2 from the top of the front tooth 12 at the first pivot point A and the distance d3 from the top of the tooth to lead 3 to the first pivot point A.
  • the value of the grip security SP will be higher than that chosen for a wristwatch for example.
  • the guide means are positioned with respect to the toothed wheel 2 so that the tooth to be driven 3 is the tooth closest to the line of centers 14, which connects the center C of the toothed wheel 2 and the first pivot point A of rocker 4.
  • the guide means comprise first guide means constituted by an opening 16 provided on a frame element of the timepiece mechanism and second guide constituted by an orienting element 18 movably mounted on a frame element of the watch mechanism.
  • the opening 16 can be made in the plate or any other plate of the frame.
  • the opening 16 comprises a first portion 16a of substantially oblong shape, and having a lower edge 20 arranged to cooperate with the guide 10 of the pawl 6 from the initial position of the rocker 4.
  • the edge 20 has a length and a shape allowing the pawl 6 to be in the avoidance position at least when its beak 8 exceeds the top of the front tooth 12.
  • the slope of the edge 20 can be downward in the direction of the toothed wheel 2 (as shown) or rising, the main thing being that the point S1 of the edge 20 of the first portion 16a on which the guide 10 rests when the beak 8 passes above the top of the front tooth 12 is positioned at a distance d4 from the first pivot point A chosen so that the beak 8 of the pawl 6 is sufficiently raised and far enough from the top of the front tooth 12 in order to respect the avoidance safety SE as defined above and to comfortably avoid the front tooth 12 .
  • the opening 16 also comprises a second portion 16b communicating with the first portion 16a and in which the guide 10 of the pawl 6 can circulate when said pawl 6 is brought into its engagement position, but also when it is moved to cause the tooth to drive 3 as well as to move into its release position and return to the initial position, as will be described below.
  • the second portion 16b is sufficiently flared in the direction of the toothed wheel 2 to allow the guide 10 to move in said second portion when the pawl 6 pivots with respect to its pivot point B in the direction of the wheel to be driven 2 to position itself in its engagement position. Then the second portion 16b forms a clearance zone in which the guide 10 can move until the rocker 4 reaches its maximum driving position as shown in picture 3 .
  • the second portion 16b is also dimensioned to allow the guide 10 to move there when the pawl 6 is brought into its disengaged position and the latch returns to its initial position, as will be described below.
  • the orienting element 18 comprises a spring.
  • the orienting element can be a spring, of the jumper type, or a pivoting part having the appropriate shape described below, and returned by a spring.
  • the orienting element 18 or the spring comprises a first inclined plane 22a and a second inclined plane 22b joined by their apex S2.
  • the first inclined plane 22a is arranged to cooperate with the guide 10 of the pawl 6 after the beak 8 has passed the top of the front tooth 12 in order to cause the pawl 6 to pivot with respect to the second pivot point B and bring it into its engagement position as shown in the figure 2 .
  • the slope of the first inclined plane 22a is downward in the direction of the toothed wheel 2, its angle of inclination and its length being chosen so that the top S2 of the orienting element or spring 18 against which the guide 10 s presses when the pawl 6 reaches its engagement position is positioned at a distance d5 from the first pivot point A such that the pawl 6 has pivoted sufficiently in the direction of the toothed wheel 2 so that its beak 8 is sufficiently engaged between the tooth before 12 and the tine to drive 3 and early enough and that it is at the distance d1 allowing to respect the safety grip of the tine to drive 3 as defined above so as to guarantee a good grip with the tine to lead 3 well before said tooth to lead 3.
  • the second inclined plane 22b of the orienting element or spring 18 is arranged to cooperate with the guide 10 of the pawl 6 when the actuating rocker 4 returns to its initial position in order to move the said orienting element or spring 18 movable to allow bring the pawl 6 into an unlatching position as shown in the figure 4 .
  • the second inclined plane 22b is configured so that the guide 10 comes into contact with it when the pawl 6, pushed back by the front tooth 12 when rocker 4 returns to its initial position, pivots with respect to its pivot point B away from wheel 2.
  • Guide 10 raises orienting element 18 to separate it and allow rocker 4 and pawl 6 in initial position.
  • the directing element or spring 18 then returns to its normal position.
  • the orientation of the inclined planes 22a and 22b of the orienting element or spring 18 is defined so that the engagement or disengagement of the pawl 6 under the effect of the guide 10 can be done without unnecessary effort. .
  • the operation of the actuating device of the invention is as follows: when the wheel 2 must be actuated by one step, the rocker 4 is controlled to leave its initial position and pivot counterclockwise around its pivot point A to move the pawl 6 in the direction of the wheel 2.
  • the pawl 6 moves, its guide 10 rests on the edge 20 of the first portion 16a of the opening 16 so that the beak 8 of the pawl 6, free to pivot around its pivot point B, follows the movement imposed by the edge 20 of the opening 16.
  • the guide 10 arrives at the point S1 of the edge 20, the pawl 6 is positioned in its avoidance position with respect to the front tooth 12 chosen to comfortably avoid the front tooth 12 and respect the safety avoidance SE of the front tooth 12 as defined above, as represented on the figure 1 .
  • guide 10 also moves in opening 16 and comes into abutment against first inclined plane 22a of orienting element 18 so that pawl 6 pivots around its point of pivoting B in the clockwise direction to be brought into its engagement position sufficiently before the tine to be driven 3 while respecting the grip safety SP with the tine to be driven 3 as defined above, as represented on the figure 2 .
  • rocker 4 returns to its initial position by pivoting around its pivot point A clockwise.
  • the pawl 6, abutting against the front tooth 12 pivots around its pivot point B in the counterclockwise direction so that its guide 10 abuts against the second inclined plane 22b of the orienting element 18 to lift it and move it aside in order to allow the pawl 6 to move into its unlatched position as shown in the figure 4 .
  • rocker 4 and pawl 6 return to their respective initial positions, guide 10 circulating in opening 16 to return to first portion 16a of said opening 16.
  • the actuation device makes it possible to position the beak 8 of the pawl 6 very precisely between the front tooth 12 and the tooth to be driven 3 to ensure good penetration with the tooth to be driven 3, while having avoided the front tooth 12 with a high avoidance safety, and this even if the toothed wheel to be actuated has a large number of teeth, the division between the safety of engagement with the tooth to be driven and the avoidance safety of the front tooth being then tight.
  • the toothed wheel 2 can comprise at least 20 teeth, preferably at least 24 teeth.
  • the toothed wheel 2 may for example be a 31-tooth date star of a date mechanism, and more particularly a perpetual calendar mechanism, actuated by the large rocker.
  • the toothed wheel can also be any other toothed wheel or star having a large number of teeth and actuated by a rocker or a lever in a watch mechanism.
  • the actuation device according to the invention is particularly suitable when the watch mechanism requires the use of a rocker or a very long lever which, without the device of the invention, would have the effect of impairing the avoidance and grip securities.
  • the pawl 6 being loosely mounted on the rocker 4, is easy to pivot to engage in the teeth or disengage from them with precision, so that any slipping in or out between the pawl 6 and the wheel 2 is deleted.
  • the orienting element 18 in the form of a spring advantageously makes it possible to eliminate the on-board large rocker pawl spring usually used in a standard perpetual calendar mechanism. Indeed, such a spring of very low force is complicated to produce in a standard perpetual calendar mechanism in which the large pawl acting on the star of 31 is integral with the large rocker.

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

Claims (10)

  1. Vorrichtung (1) zur Betätigung eines Zahnrads (2) eines Uhrwerksmechanismus durch Mitnahme eines zu führenden Zahns (3) des Zahnrads (2), wobei die Betätigungsvorrichtung eine Betätigungswippe (4), die dazu gestaltet ist, an einem ersten Schwenkpunkt (A) zwischen einer Ausgangsposition und einer maximalen Mitnahmeposition des zu führenden Zahnes (3) zu schwenken, einen Sperrkegel (6), der frei drehbar an einem zweiten Schwenkpunkt (B) auf der Betätigungswippe (4) gelagert ist, wobei der Sperrkegel (6) einen Schnabel (8), der dazu gestaltet ist, den zu führenden Zahn (3) mitzunehmen, und eine Führung (10) umfasst, sowie Führungsmittel umfasst, die dazu gestaltet sind, mit der Führung (10) zusammenzuwirken, wenn die Betätigungswippe (4) sich zwischen ihrer Ausgangsposition und ihrer maximalen Mitnahmeposition bewegt, wobei die Führungsmittel dazu ausgestaltet sind, den Sperrkegel (6) in einer Position zum Ausweichen vor einem vorderen Zahn (12), der dem zu führenden Zahn (3) vorangeht, zu positionieren, in welcher der Abstand des Schnabels (8) des Sperrkegels (6) zum ersten Schwerpunkt (A), zumindest wenn der Schnabel (8) des Sperrkegels (6) über die Spitze des vorderen Zahns (12) hinausragt, streng kleiner ist als der Abstand der Spitze des vorderen Zahns (12) zum ersten Schwenkpunkt (A), und dann das Schwenken des Sperrkegels (6) in Bezug auf den zweiten Schwenkpunkt (B) in Richtung des Zahnrads (2) in einer Eingriffsposition zwischen dem vorderen Zahn (12) und dem zu führenden Zahn (3) zu bewirken, gemäß welcher der Abstand des Schnabels (8) des Sperrkegels (6) zum ersten Schwenkpunkt (A) in Bezug auf die Ausweichposition im Hinblick auf das Eindringen in den zu führenden Zahn (3) durch den Schnabel (8) des Sperrkegels (6) für seine Mitnahme zugenommen hat, wobei die Betätigungsvorrichtung dadurch gekennzeichnet ist, dass die Führungsmittel derart in Bezug auf das Zahnrad (2) positioniert sind, dass der zu führende Zahn (3) der Zahn ist, der am nächsten an der Mittellinie (14) liegt, welche die Mitte (C) des Zahnrads (2) mit dem ersten Schwenkpunkt (A) der Wippe (4) verbindet.
  2. Betätigungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Führungsmittel erste Führungsmittel, die aus einer Öffnung (16) bestehen, die auf einem Gestellelement des Uhrwerksmechanismus vorgesehen ist, und zweite Führungsmittel umfassen, die aus einem Orientierungselement (18) bestehen, das beweglich auf einem Gestellelement des Uhrwerksmechanismus gelagert ist.
  3. Betätigungsvorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Öffnung (16) einen ersten Abschnitt (16a), der dazu gestaltet ist, mit der Führung (10) des Sperrkegels (6) zusammenzuwirken und eine Länge aufweist, die es dem Sperrkegel (6) erlaubt, sich, zumindest wenn sein Schnabel (8) über die Spitze des vorderen Zahns (12) übersteht, in der Ausweichposition zu befinden, und einen zweiten Abschnitt (16b) umfasst, der mit dem ersten Abschnitt (16a) zusammenwirkt und in dem die Führung (10) umläuft, wenn der Sperrkegel (6) in seine Eingriffsposition geführt wird.
  4. Betätigungsvorrichtung nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, dass das Orientierungselement (18) eine erste geneigte Ebene (22a) umfasst, die dazu gestaltet ist, mit der Führung (10) des Sperrkegels (6) zusammenzuwirken, nachdem sein Schnabel (8) über die Spitze des vorderen Zahns (12) übersteht, um zu bewirken, dass der Sperrkegel (6) in Bezug auf den zweiten Schwenkpunkt (B) schwenkt, und ihn in seine Eingriffsposition zu führen.
  5. Betätigungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Orientierungselement (18) eine zweite geneigte Ebene (22b) umfasst, die dazu gestaltet ist, mit der Führung (10) des Sperrkegels (6) zusammenzuwirken, wenn die Betätigungswippe (4) in ihre Ausgangsposition zurückkehrt, um das Orientierungselement (18) zu verlagern, um das Führen des Sperrkegels (6) in eine Ausklinkungsposition zu ermöglichen.
  6. Betätigungsvorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass das Orientierungselement (18) eine Feder umfasst.
  7. Betätigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Führungsmittel derart ausgestaltet sind, dass, wenn der Schnabel (8) des Sperrkegels (6) über die Spitze des vorderen Zahns (12) übersteht, wobei der Sperrkegel (6) sich in der Ausweichposition befindet, die Ausweichsicherheit (SE) des vorderen Zahns (12) höher ist als die Differenz zwischen dem Abstand der Spitze des vorderen Zahns (12) zum ersten Schwenkpunkt (A) und dem Abstand der Spitze des zu führenden Zahns (3) zum ersten Schwenkpunkt (A).
  8. Betätigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Führungsmittel derart ausgestaltet sind, dass, wenn der Sperrkegel (6) sich in der Eingriffsposition befindet, die Eindringsicherheit (SP) mit dem zu führenden Zahn (3) höher oder gleich der Differenz zwischen dem Abstand der Spitze des vorderen Zahns (12) zum ersten Schwenkpunkt (A) und dem Abstand der Spitze des zu führenden Zahns (3) zum ersten Schwenkpunkt (A) ist.
  9. Betätigungsvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Zahnrad (2) mindestens 20 Zähne, vorzugsweise mindestens 24 Zähne, umfasst.
  10. Uhr, die eine Betätigungsvorrichtung nach einem der Ansprüche 1 bis 9 umfasst.
EP19172297.4A 2019-05-02 2019-05-02 Betätigungsvorrichtung eines zahnrads in einem uhrwerksmechanismus Active EP3734372B1 (de)

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EP19172297.4A EP3734372B1 (de) 2019-05-02 2019-05-02 Betätigungsvorrichtung eines zahnrads in einem uhrwerksmechanismus

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EP19172297.4A EP3734372B1 (de) 2019-05-02 2019-05-02 Betätigungsvorrichtung eines zahnrads in einem uhrwerksmechanismus

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EP3734372A1 EP3734372A1 (de) 2020-11-04
EP3734372B1 true EP3734372B1 (de) 2022-10-12

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4246247A1 (de) * 2022-03-14 2023-09-20 Patek Philippe SA Genève Betätigungsmechanismus für uhr

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH54709A (fr) * 1911-02-13 1912-06-17 Robert Cart Dispositif pour l'actionnement d'une roue dentée par un levier pivotant
CH703823B1 (fr) * 2010-09-23 2014-12-15 Patek Philippe Sa Geneve Bascule à cliquet, mécanisme d'entraînement pas à pas comportant une telle bascule et pièce d'horlogerie comportant un tel mécanisme.
EP2503411B1 (de) * 2011-03-22 2014-12-03 Montres Breguet SA Single-ratchet instant perpetual calendar

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