EP3112949A1 - Mechanische energiequelle für uhrwerk - Google Patents

Mechanische energiequelle für uhrwerk Download PDF

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Publication number
EP3112949A1
EP3112949A1 EP15174850.6A EP15174850A EP3112949A1 EP 3112949 A1 EP3112949 A1 EP 3112949A1 EP 15174850 A EP15174850 A EP 15174850A EP 3112949 A1 EP3112949 A1 EP 3112949A1
Authority
EP
European Patent Office
Prior art keywords
spring
drum
shaft
support
barrel
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
EP15174850.6A
Other languages
English (en)
French (fr)
Other versions
EP3112949B1 (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
Original Assignee
Cartier International AG
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 Cartier International AG filed Critical Cartier International AG
Priority to EP15174850.6A priority Critical patent/EP3112949B1/de
Publication of EP3112949A1 publication Critical patent/EP3112949A1/de
Application granted granted Critical
Publication of EP3112949B1 publication Critical patent/EP3112949B1/de
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Anticipated expiration legal-status Critical

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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-end.
  • 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.
  • 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 cooperating with the spring and defining a variable active length depending on the state of charge of the mainspring to limit the variation of the output torque with reference to the torque variation observed with a barrel equivalent 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 reload the mainspring 6.
  • the drum 2 performs the role of output member, to allow the mainspring to release its mechanical energy in the watch movement through it, and is intended to mesh with a movement of the 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 state of maximum load, 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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)
EP15174850.6A 2015-07-01 2015-07-01 Mechanische energiequelle für uhrwerk Active EP3112949B1 (de)

Priority Applications (1)

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

Applications Claiming Priority (1)

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

Publications (2)

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

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Citations (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
CH704576A2 (fr) 2011-03-02 2012-09-14 Seiko Instr Inc Ressort moteur et pièce d'horlogerie mécanique comprenant un tel ressort moteur.
EP2515185A1 (de) * 2011-04-21 2012-10-24 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Motor mit konstantem Drehmoment
WO2012168443A2 (fr) 2011-06-10 2012-12-13 Haute Ecole Arc Source d'energie mecanique pour mouvement horloger a couple de sortie predefini

Patent Citations (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
CH704576A2 (fr) 2011-03-02 2012-09-14 Seiko Instr Inc Ressort moteur et pièce d'horlogerie mécanique comprenant un tel ressort moteur.
EP2515185A1 (de) * 2011-04-21 2012-10-24 Manufacture et fabrique de montres et chronomètres Ulysse Nardin Le Locle SA Motor mit konstantem Drehmoment
WO2012168443A2 (fr) 2011-06-10 2012-12-13 Haute Ecole Arc Source d'energie mecanique pour mouvement horloger a couple de sortie predefini

Also Published As

Publication number Publication date
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