EP3112949B1 - Mechanische energiequelle für uhrwerk - Google Patents

Mechanische energiequelle für uhrwerk Download PDF

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Publication number
EP3112949B1
EP3112949B1 EP15174850.6A EP15174850A EP3112949B1 EP 3112949 B1 EP3112949 B1 EP 3112949B1 EP 15174850 A EP15174850 A EP 15174850A EP 3112949 B1 EP3112949 B1 EP 3112949B1
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EP
European Patent Office
Prior art keywords
spring
drum
energy source
support
arbor
Prior art date
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Application number
EP15174850.6A
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English (en)
French (fr)
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EP3112949A1 (de
Inventor
Gaël GUERLESQUIN
Romain MOYSE
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.)
Cartier International AG
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Cartier International AG
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Priority to EP15174850.6A priority Critical patent/EP3112949B1/de
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    • 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
    • G04B1/00—Driving mechanisms
    • G04B1/10—Driving mechanisms with mainspring

Definitions

  • Sources of mechanical energy of this type are well known in the field of watchmaking.
  • a recognized problem which is associated with the use of a mainspring is that the output torque that it delivers to the watch movement generally depends on its state of charge.
  • the chronometric performance of a watch movement depends largely on the torque delivered by the barrel.
  • the first approach has allowed the development of watchmaking movements of the constant force type or winding equal.
  • these watch movements are difficult to develop and therefore expensive, which limits the use in parts of very high quality. range.
  • the corresponding mechanisms are often delicate and their reliability can quickly be undermined especially in case of shock.
  • the mechanical power source according to the invention advantageously comprises an output torque control mechanism arranged to limit the variations in a predefined range of use in terms of state of charge of the mainspring.
  • each of the patent applications WO2012 / 168443A2 and EP1914604A1 discloses a compensation mechanism arranged at the barrel outlet and making it possible to compensate for variations in the torque exiting the barrel in order to deliver a substantially constant torque to the watch movement.
  • Licences CH287276 and US167,372 disclose other barrel constructions intended to limit the variations of the delivered torque, by direct action on the mainspring.
  • EP2515185A1 which assumes that the traditional barrel can not achieve the desired constant torque.
  • this document discloses the construction of a source of mechanical energy comprising a shaft and a coaxial ring and free to rotate relative to each other, a spring made in the form of an elastically deformable beam being housed inside the crown.
  • This construction comprises an input member arranged in engagement with a winding mechanism of the spring and an output member arranged in engagement with a mobile of a watch movement to allow the spring to release its energy in the watch movement in the form of a substantially constant output torque.
  • One of these bodies cooperates with the tree and the other with the crown.
  • the construction also comprises an output torque control mechanism arranged to act on the spring and to vary the active length as a function of its state of charge.
  • a main object of the present invention is to propose an alternative construction of a mechanical energy source of the type which has just been described, comprising a regulation mechanism making it possible to reduce as much as possible the variations in the torque coming directly out of the barrel when the state of charge of the mainspring varies between its minimum and maximum values.
  • a regulation mechanism making it possible to reduce as much as possible the variations in the torque coming directly out of the barrel when the state of charge of the mainspring varies between its minimum and maximum values.
  • the present invention relates more particularly to a mechanical energy source, for a watch movement, of the type mentioned above, characterized in that the mechanical energy source comprises a regulation mechanism including a control member arranged to cooperate with the spring and define a variable active length in a function of the state of charge of the mainspring in order to limit the variation of the output torque with reference to the variation of torque observed with an equivalent barrel of conventional construction.
  • the mechanical energy source comprises a regulation mechanism including a control member arranged to cooperate with the spring and define a variable active length in a function of the state of charge of the mainspring in order to limit the variation of the output torque with reference to the variation of torque observed with an equivalent barrel of conventional construction.
  • the value of the active length of the mainspring is permanently defined as a function of the state of charge of the spring, to regulate the value of the torque delivered to the watch movement, so that in the best in some cases, this value remains substantially constant regardless of the state of charge of the mainspring.
  • control mechanism comprises a support carrying the control member and having a first kinematic connection with the drum and a second kinematic connection with the shaft, so that its position with reference to the portions of Spring connection varies depending on the state of charge of the spring.
  • the support is preferably arranged to be mobile in rotation, with reference to the barrel, being coaxial with the shaft and the drum.
  • the support can advantageously be pivoted at least indirectly on the shaft.
  • control member is arranged on the support such that it is likely to move in a substantially radial direction with reference to the support.
  • the control member advantageously comprises a finger arranged between two turns of the spring to exert a substantially radial pressure on one of the two turns, under the effect of the action of an elastic member and so as to define a contact region, to lock the coil against the drum by compression, and neutralize a portion of the spring substantially between the second connecting portion and the contact region.
  • the regulation mechanism comprises at least one satellite mounted pivoting on the drum and comprising a first wheel, arranged in engagement with a sun gear integral with the shaft, and a second wheel, arranged in engagement with a toothed wheel secured to the support, the first and second wheels being secured in rotation.
  • the support can then advantageously have the shape of a disc arranged free to pivot on the shaft and so as to be guided by a guide surface of the drum.
  • the present invention also relates to a watch movement comprising a source of mechanical energy having the characteristics which have just been exhibited, as well as a timepiece equipped with such a watch movement.
  • the figures 1 and 2 represent the same simplified perspective top view of a portion of a mechanical energy source according to a preferred embodiment of the present invention.
  • the mechanical power source comprises a barrel 1 having frame elements of conventional type, that is to say a drum 2 pivoted on a shaft 4, these two members being coaxial.
  • the shaft 4 is here intended to be pivoted between two frame members of the watch movement (not shown) in the usual manner, without limitation.
  • the barrel 1 contains a barrel spring 6, arranged generally around the shaft by forming a spiral curve, and is closed by a cover 8 ( Figures 3 and 4 ).
  • a bung 10 is also engaged on the shaft 4 to allow the assembly of a first connecting portion of the spring 6 to the shaft, typically its inner end. Conventionally, it is also planned to assemble a second connecting portion of the spring 6 to the drum 2, generally its outer end.
  • the shaft 4 here fulfills the function of input member of the barrel, being intended to be rotated by a winding train, in a conventional manner, to recharge the mainspring spring 6.
  • the drum 2 serves as an output member, to allow the barrel spring to release its mechanical energy in the watch movement through it, and is intended to mesh with a mobile movement.
  • the skilled person can adapt the present teaching according to his own needs without departing from the scope of the invention, in particular by inverting the input and output functions as they are assigned here to the tree and the drum.
  • the mechanical energy source according to the present invention further comprises a mechanism for regulating the torque delivered by the barrel to the watch movement.
  • the torque of a spiral spring in bending depends on its modulus of elasticity (E), its quadratic moment (e 3 , h), its length (L) and its arming angle ( ⁇ ), that is to say the angle separating its two ends from one another (the two connecting portions of the spring here), and responds to the following relationship:
  • E modulus of elasticity
  • e 3 , h quadratic moment
  • L length
  • ⁇ arming angle
  • the Applicant has sought a solution to take into account the variation of the arming angle over time and regulate the value of the torque delivered accordingly, so that the latter remains as constant as possible, in any case such in a way that it presents a limited variation with reference to the variation observed with an equivalent barrel of conventional construction.
  • the Applicant has developed a construction comprising a regulation mechanism varying the active length of the mainspring 6 as a function of its state of charge, in other words, such that L becomes dependent on ⁇ to maintain generally constant value of C presented above.
  • This gives the following new relation, valid for the energy source according to the present invention: VS ⁇ E ⁇ e 3 ⁇ h 12 ⁇ ⁇ The ⁇ in which the report ⁇ The ⁇ is substantially constant.
  • the regulation mechanism comprises components for measuring the state of charge of the mainspring spring 6, visible on the figure 1 .
  • the regulation mechanism comprises a sun gear 12 which is rotatably connected to the shaft 4. It is advantageous to provide the sun gear 12 with frictional engagement on the shaft 4 so that it is not driven. by the shaft when the winding is actuated while the spring is already in its state of maximum load.
  • a clutch can also be considered elsewhere in the winding train.
  • barrels commonly referred to as "a tower” are known, the typical barrels currently used are made with an amplitude of armor extending over several turns (usually eight turns). In any case, the implementation of the present invention is not limited by this amplitude of arming. The skilled person can adapt the present teaching without particular difficulty according to his own needs without departing from the scope of the invention.
  • the regulation mechanism comprises two satellites 14 mounted free to rotate on the drum 2 and each of which comprises first and second wheels 16, 18 integral in rotation (the first wheels 16 being visible on the sections of the wheels).
  • the first wheel 16 of each satellite 14 is arranged in engagement with the sun gear 12, while the second wheel 18 of each satellite 14 is arranged in engagement with the internal toothing of a ring-shaped peripheral wheel 20.
  • peripheral wheel 20 is rotated in a first direction when the barrel spring is loaded and in the opposite direction when the barrel spring is discharged, which makes it able to constitute an indicator of the state of charge of the barrel. spring.
  • the reduction gear ratio of this gear train makes it possible to control the speed of rotation of the peripheral wheel with respect to the sun gear (and therefore the speed of rotation of the wheel relative to the speed of the load / discharge of the spring).
  • the peripheral wheel 20 has a plurality of notches 22 at its outer periphery for angular indexing of a support 24, illustrated in FIGS. figures 2 , 3 and 4 , of which positioning members 26 of shape complementary to the notches ensure that the wheel 20 and the support 24 are integral in rotation.
  • the support 24 has the general shape of a disk in which a recess 30 is formed, in the direction of its thickness, on an area here representing a little less than a quarter of its total area, by way of nonlimiting illustration.
  • the support 24 carries a control member 32 of the active length of the mainspring spring 6, arranged in the recess 30.
  • the member 32 comprises an elongate base 34 carrying a guide lug 36 at a first end and a finger 38, substantially parallel to the barrel shaft 4 and whose function will be explained later, near its second end.
  • an elastic return member 40 is also arranged in the recess 30 to exert a pressure force on the control member 32, tending to push it here in the direction of the wall of the drum 2.
  • a generally disk-shaped plate 42 covers the support 24 to define a guide path for the control member 32.
  • the support 24 also has an elongate opening 44 extending in a substantially radial direction, the width is less than that of the guide lug 36. It is then understood that the control member 32 is enclosed between the support 24 and the plate 42 so that it can have a substantially radial translation movement.
  • the plate 42 is made integral with the support 24 in any suitable manner, here preferably by placing screws in holes 46.
  • the figure 3 illustrates the source of mechanical energy while the mainspring spring 6 is in or near its maximum state of charge, while the figure 4 illustrates it while the mainspring spring 6 is close to its minimum state of charge.
  • the finger 38 is made of a material such that it can slide along the barrel spring 6 with little friction. It may be of any suitable material, for example of steel coated with ADLC, without departing from the scope of the present invention. In another embodiment, this function can be performed by a roller pivoting on an axis.
  • the finger 38 is inserted between two adjacent turns of the mainspring spring 6 to exert a substantially radial pressure on the turn located outside, under the effect of the action of the elastic return member 40.
  • the finger 38 defines and a contact region on the spring 6, by pressure on which it locks the outer turn against the drum 2, by compression, and neutralizes the portion of the spring substantially between the outer end of the spring and the contact region concerned.
  • the locking of the turn is made directly against the wall of the drum 2 when it is the last turn on which the finger 38 rests. This is in particular the case illustrated in FIG. figure 3 when the load of the mainspring is in or near its maximum value.
  • the support 24 is rotated in a manner defined by the two kinematic chains which connect it, via the satellites 14, on the one hand, to the barrel shaft and, on the other hand, to the drum.
  • the regulation mechanism comprises a differential gear having an output controlled from the movements of the shaft and the drum and arranged to drive the support 24. Also, the latter is rotated by a such that its angular position is representative of the state of charge of the mainspring spring 6.
  • the finger 38 When the spring is discharged, the finger 38 follows a spiral curve and passes progressively from one turn to the next in the direction of the barrel shaft 4.
  • the active length of the spring is minimal or almost, which makes it possible to deliver a torque at the barrel output of a value substantially equal to the value of the torque when the spring is fully loaded, in which situation the active length is maximum.
  • the support 24 rests at least indirectly on a guide surface 50 of the drum 2 to improve its stability, as is apparent from the Figures 3 and 4 .
  • the regulation mechanism which has just been described may comprise several bearing fingers 38 for distributing the load on the spring 6.
  • the elastic return member 40 may have for example the shape of a hairspring to act on all fingers 38.
  • the support 24 carrying the finger 38 is fixed with reference to the drum but that the finger itself is rotated, in a manner that depends on the state load of the spring, to act on a turn and, for example, extract a longer or shorter portion of the spring out of the drum, to neutralize it, and thus change the active length.
  • the finger would advantageously be made of a material chosen in such a way that significant friction would occur between the finger and the spring, for example rubber. It is then understood that the second connecting portion of the (external) drum spring would not be unique but rather that it would move along the spring as a function of the state of charge of the latter.
  • the finger 38 it is also possible, as an alternative to the embodiment described, for the finger 38 to undergo a pressure force exerted by the elastic member oriented towards the barrel shaft 4, to neutralize the portion of the spring situated between its internal end. and the corresponding contact region.
  • a mechanical power source for a watch movement comprising a control mechanism arranged to control the active length of the mainspring depending on its state of charge, without departing from the scope of the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)

Claims (11)

  1. Mechanische Energiequelle für Uhrwerk, aufweisend ein Federhaus (1), umfassend eine Welle (4) und eine Trommel (2), die koaxial und frei zueinander drehbar sind, wobei die Trommel (2) eine Feder (6) aufnimmt, die spiralförmig um die Welle (4) angeordnet ist und einen ersten Verbindungsabschnitt, der mit der Welle (4) verbunden ist, und einen zweiten Verbindungsabschnitt, der mit der Trommel (2) verbunden ist, aufweist, wobei das Federhaus (1) umfasst
    - ein Eingangsorgan, das bestimmt ist, im Eingriff mit einem Aufzugmechanismus des Uhrwerks ausgebildet zu sein, um das Spannen der Feder (6) zu erlauben,
    - ein Ausgangsorgan, das bestimmt ist, im Eingriff mit einem Drehteil des Uhrwerks ausgebildet zu sein, um der Feder (6) zu erlauben, ihre Energie im Uhrwerk in Form eines Ausgangsmoments freizugeben,
    wobei die Energiequelle einen Reguliermechanismus weiter umfasst, der ein Steuerorgan (32) einschließt, das ausgebildet ist, um mit der Feder (6) zusammenzuwirken und davon eine variable aktive Länge in Abhängigkeit vom Spannzustand der Feder des Federhauses zu definieren, um die Schwankung des Ausgangsmoments zu begrenzen.
  2. Mechanische Energiequelle nach Anspruch 1, aufweisend einen Halter (24), der das Steuerorgan (32) trägt und eine erste kinematische Verbindung mit der Trommel (2) und eine zweite kinematische Verbindung mit der Welle (4) derart aufweist, dass seine Referenzposition zum ersten und zweiten Verbindungsabschnitt der Feder (6) in Abhängigkeit vom Spannzustand der Feder (6) schwankt.
  3. Energiequelle nach Anspruch 2, dadurch gekennzeichnet, dass der Halter (24) ausgebildet ist, um in Bezug auf das Federhaus (1) rotierend beweglich zu sein, wobei er zur Welle (4) und zur Trommel (2) koaxial ist.
  4. Energiequelle nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Halter (24) mindestens indirekt auf der Welle (4) geschwenkt wird.
  5. Energiequelle nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass
    das Steuerorgan (32) auf dem Halter (24) derart ausgebildet ist, dass es imstande ist, sich gemäß einer etwa radialen Richtung in Bezug zum Halter (24) zu verlagern, und
    dass das Steuerorgan (32) mindestens einen Finger (38) aufweist, der zwischen zwei Windungen der Feder (6) ausgebildet ist, um aufgrund der Wirkung eines elastischen Organs (40) einen etwa radialen Druck auf eine der zwei Windungen auszuüben und derart, dass mindestens eine Kontaktregion definiert wird, um die Windung durch Kompression gegen die Trommel (2) zu verriegeln und einen Abschnitt der Feder (6) zu neutralisieren, der sich etwa zwischen dem zweiten Verbindungsabschnitt und der Kontaktregion befindet.
  6. Energiequelle nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass der Reguliermechanismus ein Differentialgetriebe (12, 14, 16, 18, 20) aufweist, das einen Ausgang (20) aufweist, der durch Verlagerungen der Welle (4) und der Trommel (2) gesteuert wird und ausgebildet ist, um das Antreiben des Halter (24) zu sichern.
  7. Energiequelle nach Anspruch 6, dadurch gekennzeichnet, dass der Reguliermechanismus mindestens ein Planetenrad (14) aufweist, das schwenkend auf der Trommel (2) angebracht ist und ein erstes Rad (16), das im Eingriff mit einem Sonnenrad (12), das mit der Welle (4) fest verbunden ist, sowie ein zweites Rad (18), das im Eingriff mit einem Zahnrad (20), das mit dem Halter (24) rotierend fest verbunden ist, umfasst, wobei das erste und zweite Rad (16, 18) rotierend fest miteinander verbunden sind.
  8. Mechanische Energiequelle nach Anspruch 7, dadurch gekennzeichnet, dass der Halter (24) die Form einer Scheibe aufweist, die frei schwenkbar auf der Welle (4) und derart ausgebildet ist, dass er von einer Führungsfläche (50) der Trommel (2) führbar ist.
  9. Mechanische Energiequelle nach den Ansprüchen 7 und 8, dadurch gekennzeichnet, dass das mit dem Halter (24) fest verbundene Zahnrad (20) eine Innenzahnung aufweist, die im Eingriff mit dem zweite Rad (18) ausgebildet ist.
  10. Uhrwerk (1), aufweisend eine mechanische Energiequelle nach einem der Ansprüche 1 bis 9.
  11. Uhr, aufweisend ein Uhrwerk nach Anspruch 10.
EP15174850.6A 2015-07-01 2015-07-01 Mechanische energiequelle für uhrwerk Active EP3112949B1 (de)

Priority Applications (1)

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EP15174850.6A EP3112949B1 (de) 2015-07-01 2015-07-01 Mechanische energiequelle für uhrwerk

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Application Number Priority Date Filing Date Title
EP15174850.6A EP3112949B1 (de) 2015-07-01 2015-07-01 Mechanische energiequelle für uhrwerk

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EP3112949A1 EP3112949A1 (de) 2017-01-04
EP3112949B1 true EP3112949B1 (de) 2018-04-25

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US167372A (en) * 1875-08-31 Improvement in mainspring attachments for watches
CH287276A (fr) * 1950-11-29 1952-11-30 Ebauches Sa Ensemble d'un barillet et de son ressort.
EP1914604A1 (de) 2006-10-19 2008-04-23 Girard-Perregaux S.A. Uhr mit Kraftübertragung mit konstantem Drehmoment zwischen der Kraftquelle und dem mechanischen Oszillator
JP2012181156A (ja) 2011-03-02 2012-09-20 Seiko Instruments Inc 時計用ぜんまい及びこれを備えた機械式時計
EP2515185B1 (de) * 2011-04-21 2019-06-12 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Motor mit konstantem Drehmoment
CH705079A1 (fr) 2011-06-10 2012-12-14 Haute Ecole Arc Source d'énergie mécanique pour mouvement horloger à couple de sortie prédéfini.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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