EP4405756B1 - Uhrwerk - Google Patents

Uhrwerk

Info

Publication number
EP4405756B1
EP4405756B1 EP22782883.7A EP22782883A EP4405756B1 EP 4405756 B1 EP4405756 B1 EP 4405756B1 EP 22782883 A EP22782883 A EP 22782883A EP 4405756 B1 EP4405756 B1 EP 4405756B1
Authority
EP
European Patent Office
Prior art keywords
mobile
input
output
elastic element
driven
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.)
Active
Application number
EP22782883.7A
Other languages
English (en)
French (fr)
Other versions
EP4405756A1 (de
Inventor
Stephen Forsey
Florian Corneille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Greubel Forsey SA
Original Assignee
Greubel Forsey SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Greubel Forsey SA filed Critical Greubel Forsey SA
Publication of EP4405756A1 publication Critical patent/EP4405756A1/de
Application granted granted Critical
Publication of EP4405756B1 publication Critical patent/EP4405756B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/22—Compensation of changes in the motive power of the mainspring
    • G04B1/225—Compensation of changes in the motive power of the mainspring with the aid of an interposed power-accumulator (secondary spring) which is always tensioned
    • 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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring
    • G04B1/22—Compensation of changes in the motive power of the mainspring
    • 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
    • G04B15/00—Escapements
    • G04B15/10—Escapements with constant impulses for the regulating mechanism

Definitions

  • the present invention relates to the field of watchmaking. It relates, more particularly, to a watch movement comprising a constant force mechanism as well as an additional disengageable mechanism, such as a chronograph mechanism, an animation, a chime, a countdown or the like.
  • a constant force mechanism also called an "equality remontoir”
  • These constant force mechanisms comprise a force input driven by the energy source and a force output that is kinematically linked to the input via an elastic element.
  • the latter is subjected to a prestress and is intermittently tensioned during rotation of the output.
  • a locking system is arranged to block the rotation of the input until the rotation of the output triggers a rotation of the input by a step of a predetermined angle.
  • a first classical version of such a constant force mechanism is revealed by the document CH296060 .
  • the entrance and the output are coaxial and connected to each other by the elastic element.
  • the input carries a satellite pinion which rests on a fixed toothing and which is integral in rotation with a star which cooperates with a pin carried by the output so that the star is blocked and released periodically by the rotation of the output.
  • the movement includes an additional disengageable mechanism, such as a chronograph mechanism, an animation, a chime or the like
  • an additional disengageable mechanism such as a chronograph mechanism, an animation, a chime or the like
  • a solution, proposed by the document CH716126 is to arrange the power take-off for the additional mechanism kinematically upstream of the constant force mechanism. In doing so, the state of the additional mechanism does not influence the torque supplied to the regulating system.
  • this solution is only compatible with constant force mechanisms whose input release frequency is relatively high, otherwise the frequency of the rotational steps of the power take-off may be insufficient to operate the additional mechanism.
  • An example would be the case of a constant force device input release frequency of one step per two seconds.
  • Such an arrangement would not be suitable for a chronograph mechanism driven by a power take-off located upstream of the constant force mechanism, since a chronograph must have a time resolution of at least one second, ideally a fraction of a second.
  • the document EP 1 445 669 A1 discloses a constant force mechanism for wristwatches.
  • the aim of the invention is therefore to provide a clockwork movement in which the aforementioned defects are at least partially overcome.
  • the preload of the elastic element can be modified depending on the state of the activation mechanism, i.e. depending on whether the additional mechanism is in operation or at rest. This makes it possible to minimize the influence of the additional mechanism on the torque received by the regulating system, while allowing the additional mechanism to be located kinematically downstream of the constant force device, in particular by means of an increase in said preload when the additional mechanism is in operation. Isochronism is thus ensured.
  • said prestressing control system is arranged such that the angular ratio between one of the ends of said element elastic and either said input mobile or said output mobile can be modified depending on the state of said activation mechanism, which has the effect of modifying the prestress, by partially arming or disarming the elastic element.
  • the kinematic connection between said input mobile and said elastic element is provided by said prestressing control system.
  • one end of said elastic element can be fixed to said output mobile, the other end of said elastic element being fixed to a control wheel arranged to be driven by said prestressing device.
  • said first input comprises a planet carrier mobile bearing a satellite pinion meshing both with a first sun wheel acting as said output and with a second sun wheel acting as said second input.
  • said output mobile is coaxial with said input mobile.
  • said input wheel is integral in rotation with a planet carrier wheel carrying a satellite pinion engaged with fixed teeth and integral in rotation with a star which cooperates with a pin carried by said output mobile so as to periodically release the rotation of said input.
  • the clockwork movement according to the invention can, of course, be incorporated into a timepiece
  • FIG. 1 schematically illustrates a watch movement 1 according to the invention, kinematic connections being mainly illustrated by arrows.
  • kinematic connections being mainly illustrated by arrows.
  • gears cogs, belts, chains or by any appropriate means.
  • a kinematic connection or meshing may be direct or indirect, and the arrangement illustrated is not to be interpreted as being limiting.
  • the movement 1 comprises a mechanical energy source 3, such as one or more barrels, which drives a regulating system 5, such as an escapement-balance-hairspring assembly of any type, via a suitable kinematic link.
  • This kinematic link comprises a constant force device 7, kinematically interposed between the energy source 3 and the regulating system 5.
  • a display device 8 takes force from the kinematic link in a known manner, this force taking being located typically kinematically upstream of the constant force device 7. However, it cannot be excluded that the power take-off for the whole, or for a part, of the display device 8 is located downstream of the constant force device 8. For example, the power take-off for the display of the seconds could be arranged downstream, while that for the hours and minutes is located upstream of the constant force device.
  • the constant force device 7 is based on that of the document CH296060 , but the same principle can also be applied to a constant force device 7 of the “escapement” type, such as that in the document EP2166419 or some other such mechanism.
  • the constant force device 7 comprises an elastic element 9 which is part of a kinematic connection between, on the one hand, an input wheel 11, which is driven directly or indirectly by the energy source, and, on the other hand, an output wheel 13, which is coaxial with said input wheel 11 and which directly or indirectly drives the regulating system 5.
  • the elastic element 9 is subjected to a prestress and is arranged to be recharged periodically as a function of the rotation of said output wheel 13, as mentioned in the introduction.
  • the elastic element 9 is typically a flat spiral-shaped spring, but may also be a leaf spring, a coil spring or the like.
  • the constant force device 7 comprises a planet carrier wheel set 15 which is rotationally fixed to the input wheel set 11 (or alternatively acts as the input wheel set 11 itself) and which carries a planet carrier wheel set 17 composed of a pinion 17a which meshes with a fixed toothing 19, as well as a star 17b which is rotationally fixed to the pinion 17a.
  • This star cooperates with a pinion 21 which is rotationally fixed to said output wheel set 13, such that a rotation of said output wheel set 13 by a predetermined angle, under the effect of the elastic element 9, releases the star 17b, which causes a rotation of the planet carrier wheel set 15 and thus of the input wheel set 11 by said predetermined angle, the next tip of the star 17b being blocked again by the pin 21 when the star 17b rolls on the fixed toothing 19.
  • the document CH29606060 contains a detailed explanation of this operation, in the context of a construction in which the elastic element 9 connects the input mobile 11 directly to said output mobile 13.
  • the prestress of the elastic element 9 is fixed, and is predetermined by the watchmaker.
  • this prestress can be modified by means of a prestress control system 23.
  • one of the ends of the elastic element 9 is mounted on a pilot wheel 25 which is mounted loose in the constant force device 7, the other end of the elastic element 9 being integral with the output wheel 13.
  • the outer end of the elastic element 9 is fixed to the pilot wheel 25, while the inner end is fixed to the output wheel 13, but the reverse configuration is also possible.
  • This pre-stress control system 23 is to be able to compensate for the needs (such as torque and force) necessary for the additional disengageable mechanism 27, which is located kinematically downstream of the constant force device 7.
  • This additional mechanism 27 may be, for example, a chronograph mechanism, an animation mechanism, a chime, a countdown or the like, driven by the output wheel set 13 by means of an activation mechanism 29 of any known type, such as for example a clutch of any type (radial, vertical, sliding pinion, etc.), a cam, a column wheel, a spring armed for a certain time which releases at a given moment, or the like. Since the specific form of the activation mechanism 29 is a clutch 29 in the embodiment figure 1 , the specific term “clutch 29” is subsequently used to indicate the generic characteristic “activation mechanism 29”, in order to simplify reading.
  • the additional mechanism By positioning the additional mechanism in this way, the latter can benefit from a relatively high angular velocity whose angular step is independent of the constant force device 7, and therefore does not depend on the frequency of the rotation steps of the star 17b.
  • the torque requirement downstream of the constant force device 7 varies depending on the state of the additional mechanism 27.
  • the clutch 29 is disengaged (more generically when the activation mechanism 29 is in the deactivated state)
  • the torque requirement is lower, and the torque supplied to the regulating system 5 is thus higher, the latter receiving essentially all of the torque supplied by the constant force device 7.
  • the beat frequency and amplitude of its oscillator are consequently higher.
  • the preload control system 23 makes it possible to compensate for this variation in torque requirement, by varying the preload of the elastic element 9 as a function of the latter, in particular as a function of the state of the clutch 29.
  • the pilot wheel 25 occupies a second relative angular position with respect to the input wheel 11, and the elastic element 9 is subjected to a second predetermined prestress, greater than said first prestress.
  • control of the clutch 29 and that of the preload control system 23 are carried out in parallel, by means of a common control device 31. It is also possible to arrange the control of these two elements in series. In any case, the control device 31 ensures that the angular position relative to the control wheel 25 with respect to the input wheel (and therefore the preload of the elastic element 9) changes according to the state of the clutch. Furthermore, the control device 31 can be of the manual type (actuated by a pusher, a bolt or similar), or of the automatic type (actuated by a mechanism internal to the movement 1).
  • FIG. 2 illustrates a non-limiting way of carrying out the modification of the prestress of the elastic element 9, which is based on a differential gear.
  • the elements located kinematically downstream of the output mobile 13 have not been shown.
  • the prestressing control system 23 comprises a planet carrier wheel set 33 (which is specific to it and which is distinct from the planet carrier wheel set 15 of the constant force device 7) acting as a first input which meshes with the planet carrier wheel set 15 of the constant force device 7, as well as a first solar wheel set 35 which is coaxial with the planet carrier wheel set 33 and cooperates with the control wheel 25 via a reversing gear 37.
  • the first solar wheel set 35 therefore acts as an output.
  • a second solar mobile 39 acting as a second input and being coaxial with the first 35, cooperates with, on the one hand, the control device 31, and on the other hand with at least one satellite mobile 41, which meshes with each of the solar mobiles 35, 39.
  • the illustrated construction is not limiting, and the presence or absence of references between the elements of the constant force device 7 and those of the prestressing control system 23 can be determined according to the manufacturer's needs, provided that the gear ratios are appropriate.
  • control device 31 maintains the second solar mobile 39 in a first predetermined angular position.
  • the rotation of the planet carrier mobile 15, and therefore of the input mobile 11 which is integral with it in rotation, is thus transmitted to the pilot wheel 25, the gear ratios being chosen so that the angular speeds of these two elements are identical.
  • the control device 31 When the control device 31 is actuated, which, as a reminder, causes the clutch 29 to be engaged and disengaged and therefore the additional mechanism 27 to be started, the control device 31 causes the second solar mobile 39 to pivot in one direction or the other (as the case may be) to occupy a second predetermined angular position distinct from the first, and this by means of a cam, a lever, a rake or any other ad hoc means.
  • This pivoting causes the satellite mobile 41 to pivot around its own axis of rotation and thus causes an additional rotation of the first solar mobile 35 at a predetermined angle in one direction or the other, and which is thus added to or subtracted from the normal rotation.
  • This additional rotation is transmitted to the steering wheel 25, and is added to or subtracted from the rotation received from the planet carrier 15, thus modifying the angular ratio between these two elements and partially arming/disarming (if applicable) the elastic element 9, the prestress of which is thus modified.

Landscapes

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

Claims (11)

  1. Uhrwerk (1) umfassend:
    - eine mechanische Energiequelle (3);
    - eine Konstantkraftvorrichtung (7), die einen Eingangsdrehteil (11) umfasst, der so angeordnet ist, um von der mechanischen Energiequelle (3) angetrieben zu werden, und die einen in kinematischer Verbindung mit dem Eingangsdrehteil (11) stehenden Ausgangsdrehteil (13) umfasst, der durch ein elastisches Element (9), das einer Vorspannung unterliegt und so angeordnet ist, um periodisch in Abhängigkeit von der Drehung des Ausgangsdrehteils (13) nachgeladen zu werden;
    - ein Einstellsystem (5), das so angeordnet ist, vom Ausgangsdrehteil (13) angetrieben zu werden ;
    - einen Aktivierungsmechanismus (29), der so angeordnet ist, um durch den Ausgangsdrehteil (13) angetrieben zu werden sowie einen zusätzlichen Mechanismus (27) anzutreiben; dadurch gekennzeichnet, dass das Uhrwerk (1) umfasst:
    - ein Vorspannungs-Steuerungssystem (23), das so angeordnet ist, um die Vorspannung des elastischen Elements (9) in Abhängigkeit vom Zustand des Aktivierungsmechanismus (29) abzuändern.
  2. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei das Vorspannungs-Steuerungssystem (23) so angeordnet ist, dass das Winkelverhältnis zwischen einerseits einem der Enden des elastischen Elements (9) und andererseits entweder dem Eingangsdrehteil (11) oder dem Ausgangsdrehteil (13) in Abhängigkeit vom Zustand des Aktivierungsmechanismus (29) abgeändert werden kann.
  3. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei die kinematische Verbindung zwischen dem Eingangsdrehteil (11) und dem elastischen Element (9) durch das Vorspannungs-Steuerungssystem (23) beschaffen wird.
  4. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei ein Ende des elastischen Elements (9) am Ausgangsdrehteil (13) befestigt ist, wobei das andere Ende des elastischen Elements (9) an einem Steuerrad (25) befestigt ist, das so angeordnet ist, um von dem Vorspannungs-Steuerungssystem (23) gedreht zu werden.
  5. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei das Vorspannungs-Steuerungssystem (23) so angeordnet ist, dass es eine kinematische Verbindung zwischen dem Eingangsdrehteil (11) und dem Steuerrad (25) beschafft, so dass :
    - das Steuerrad (25) während des normalen Betriebs des Uhrwerks (1) synchron mit dem Eingangsdrehteil (11) angetrieben werden kann, und
    - das Winkelverhältnis zwischen dem Steuerrad (25) und dem Eingangsdrehteil (11) verändert werden kann, um die Vorspannung des elastischen Elements (9) zu variieren.
  6. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei das Vorspannungs-Steuerungssystem (23) ein Differentialgetriebe umfasst, umfassend :
    - einen ersten Eingang (33), der so angeordnet ist, dass er vom Eingangsdrehteil (11) angetrieben wird ;
    - einen zweiten Eingang (39), der so angeordnet ist, dass er in Abhängigkeit vom Zustand des Aktivierungsmechanismus (29) angetrieben wird; und
    - einen Ausgang (35), der so angeordnet ist, dass er das Antriebsrad (25) antreibt.
  7. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei der erste Eingang (33) einen Planetenradträger (33) umfasst, das ein Planetenrad (41) trägt, das sowohl mit einem ersten Sonnenrad (35), das als der Ausgang dient, als auch mit einem zweiten Sonnenrad (39), das als der zweite Eingang (39) dient, kämmt.
  8. Uhrwerk (1) nach einem der vorhergehenden Ansprüche, wobei der Ausgangsdrehteil (13) koaxial zum Eingangsdrehteil (11) ist.
  9. Uhrwerk (1) nach dem vorhergehenden Anspruch, wobei der Eingangsdrehteil (11) drehfest mit einem Satellitenträger-Drehteil (15) verbunden ist, der ein Satelliten-Ritzel (17a) trägt, das mit einer festen Verzahnung (19) in Eingriff steht und drehfest mit einem Stern (17b) verbunden ist, der mit einem Stift (21) zusammenwirkt, der von dem Ausgangsdrehteil (13) getragen wird, so dass die Drehung des Eingangs (11) periodisch freigegeben wird.
  10. Uhrwerk (1) nach einem der vorhergehenden Ansprüche, wobei der Aktivierungsmechanismus (29) eine Kupplung ist.
  11. Uhr, die ein Uhrwerk (1) nach einem der vorhergehenden Ansprüche umfasst.
EP22782883.7A 2021-09-23 2022-09-22 Uhrwerk Active EP4405756B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21198580 2021-09-23
PCT/EP2022/076392 WO2023046841A1 (fr) 2021-09-23 2022-09-22 Mouvement d'horlogerie

Publications (2)

Publication Number Publication Date
EP4405756A1 EP4405756A1 (de) 2024-07-31
EP4405756B1 true EP4405756B1 (de) 2025-09-03

Family

ID=77910725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22782883.7A Active EP4405756B1 (de) 2021-09-23 2022-09-22 Uhrwerk

Country Status (5)

Country Link
US (1) US20240427288A1 (de)
EP (1) EP4405756B1 (de)
JP (1) JP2024534481A (de)
CN (1) CN118103777A (de)
WO (1) WO2023046841A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4296798B1 (de) * 2022-06-23 2025-03-12 Blancpain SA Uhrwerk mit einem chronographenmechanismus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH296060A (fr) 1952-01-31 1954-01-31 Marti Fritz Mécanisme de transmission de force dit à force constante.
EP1445669A1 (de) * 2003-02-10 2004-08-11 Richemont International S.A. Konstantkraftvorrichtung für Uhren mit indirekter Sekunde
EP2166419B1 (de) 2008-09-18 2013-06-26 Agenhor SA Uhrwerk, das eine Konstantkraftvorrichtung aufweist
US8882339B2 (en) * 2010-04-01 2014-11-11 Rolex S.A. Immobilizing device for a toothed wheel
EP3153935B1 (de) * 2015-10-06 2019-02-20 Montres Breguet S.A. Chronometerhemmungsmechanismus eines uhrwerks mit konstanter kraft

Also Published As

Publication number Publication date
WO2023046841A1 (fr) 2023-03-30
CN118103777A (zh) 2024-05-28
EP4405756A1 (de) 2024-07-31
US20240427288A1 (en) 2024-12-26
JP2024534481A (ja) 2024-09-20

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