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
  • G04B17/00—Mechanisms for stabilising frequency
  • G04B17/04—Oscillators acting by spring tension
  • G04B17/045—Oscillators acting by spring tension with oscillating blade springs
• • 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
  • G04B17/00—Mechanisms for stabilising frequency
  • G04B17/04—Oscillators acting by spring tension
• • 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
  • G04B17/00—Mechanisms for stabilising frequency
  • G04B17/20—Compensation of mechanisms for stabilising frequency
  • G04B17/26—Compensation of mechanisms for stabilising frequency for the effect of variations of the impulses

Definitions

• Timepiece control device with harmonic oscillator having rotating masses and a common return force
• the present invention relates to a control device based on a harmonic oscillator with a plurality of rotating masses and a common return force, intended to be integrated into a timepiece, particularly in a watch. bracelet.
• Embodiments of the invention include oscillators with two or more degrees of freedom, in which an element follows a substantially circular or elliptical periodic path under the action of a central restoring force. These oscillators are also known under the name of "isotropic harmonic oscillators".
• This device carries out a specific embodiment of an isotropic harmonic oscillator in which said primary resonators are rotary resonators each equipped with a own return means and are arranged in such a way that the axes of the joints of any two of said primary resonators and the hinge axis of said control means are never coplanar. If this proposal is more detailed, the construction
• the proposed specificity imposes a number of limitations, in particular concerning the position of the axes of the joints of the primary resonators and the control means, and the plurality of return means each requiring adjustment.
• the document FR6308310009 discloses a means for producing an isotropic harmonic oscillator which is however not usable in a wristwatch.
• the Swiss patent application CH00679 / 17 which emanates from the applicant of the present patent application and whose contents are integrally incorporated by reference in the present patent application, discloses a device for regulating a clock mechanism on the base of an isotropic harmonic oscillator, intended to be integrated into a timepiece.
• the oscillator shown in the document EP3054358 which comprises several independent primary rotary resonators is difficult to adjust because of the difficulty of identifying on which parameter to act between the stiffnesses of the elastic elements of return, and the moments of inertia of pivoting masses, with a risk of increasing instability in trying to adjust the natural frequency.
• the four oscillator variants that make it possible to improve the stability of the system are cumbersome and difficult to integrate into a watchmaking movement.
• the trajectory in an arc of the articulation points of the rods on the rockers is a cause of instability:
• the points of zero speed and maximum speed of said articulation points are not at an equal distance from each other, the braking distance is different from that of acceleration, so that the inertia perceived by said motor means in the acceleration phases are not identical to those of the deceleration phases.
• the transverse displacement of the central control means with reference to the direction of the connecting rods and the variation of the orbital radius of the connecting element further accentuate this dissymmetry.
• This imbalance disrupts the path of the connecting element and imposes, to limit the effects, dimensional constraints for example at the length of the connecting rods, the radius of the pivot point of the connecting rods and the angular amplitudes of the rockers .
• This dissymmetry can also be compensated by placing two balances symmetrically with reference to the axis of the oscillator. It would be preferable to be able to release at least some of these constraints, in particular in order to limit the number of rotating balances, to make the operation of the visible system by reducing the frequency and by increasing the amplitude of the oscillations and / or the inertia of the pendulums, to improve the stability of the oscillator, and to limit the overall size of the regulating organ by facilitating its integration.
• the circular path of the articulation points of the connecting rods and the variations of the orbital radius of the central control element due to engine torque variations is a source of deterioration of the isochronism of such an oscillator.
• the circular theoretical displacement of the central control element is decomposed into several displacements theoretical linear axes of articulation of the transmission means on the balances that correspond to the displacement of the projection of the central control element on the axes parallel to the connecting rods.
• the orbital radius of the central control element increases as well as the angular amplitude of the rockers so that the transverse component, with reference to the connecting rods, displacements of the axes of articulation becomes not negligible.
• the tangential velocity of the articulation point becomes substantially greater than that of its projection on the axis defined by the corresponding connecting rod and the perceived inertia which would be that of a mass with a purely linear movement increases. This results in a variation of the frequency of the oscillator as a function of the engine torque, which makes it necessary to limit the oscillation amplitude of the masses so as not to damage the isochronism.
• the object of the present invention is to remedy, at least partially, the disadvantages of the devices of the prior art by providing an isotropic harmonic oscillator whose integration in a watch movement and adjustment are simplified and whose performance and stability are improved.
• the present invention provides control devices of a watch mechanism on the basis of an oscillator
• the regulating device according to claim 1 comprises at least one elastic return element arranged so as to achieve a return force common to at least one subset of said masses.
• the masses are not each equipped with a specific return means reminding them to the structure and do not each form a separate resonator, so that it is possible to overcome some of the aforementioned disadvantages of the devices of the prior art, while benefiting from a simple construction using masses mounted rotatably on the rigid frame of the regulating device.
• said elastic return member is formed by the drive means which produces said common return force exerting a substantially radial force on the element. link tending to bring it back to the axis of the oscillator.
• said elastic return element is formed by the transmission means.
• This embodiment can be achieved by flexible arms having a rigidity chosen so as to be able to serve simultaneously means of transmission and means of elastic return of the masses.
• the control device comprises coupled masses two by two elastically.
• An elastic return member is located between the two masses of each pair of masses.
• This embodiment makes it possible to produce a floating oscillator whose neutral position is not defined with reference to the frame but with reference to the position of the connecting element, thus correcting the asymmetry due to the lateral displacement of this connecting element with reference to each transmission means.
• This configuration has the other advantage, for identical rotating masses, of doubling the energy of the system by doubling the deformation of the elastic element and the relative speed of the masses.
• This makes it possible to reduce the frequency of the oscillator to make its oscillations more visible or, alternatively, to reduce the size of the rotating masses to facilitate the integration of the oscillator.
• a features identical, the angular amplitude of the oscillations of the masses with reference to the frame is divided by two which improves the isochronism in case of variation of the engine torque.
• the regulating device comprises two preferably coaxial masses, elastically coupled by an elastic return element located between its two masses and connected to the connecting element by substantially perpendicular transmission elements. .
• the two masses are phase shifted by a quarter of a period in the chassis frame of reference while being in phase opposition in the fictitious oscillating frame they form between them.
• This configuration has the same advantages as the third embodiment with the additional advantage of being able to produce an oscillator comprising only two superimposed rotating masses which makes it possible to design a spectacular oscillator with large masses oscillating at low frequency or a very compact oscillator easily integrable.
• the invention also relates to a mechanical watch movement and a timepiece comprising at least one control device according to the present invention.
• FIG. 1a 1b and 1c shows different configurations of a first embodiment of a control device of a watch mechanism according to the present invention.
• Figure 2 shows a schematic view of a second embodiment of a control device according to the present invention.
• Figures 3a to 3I show two configurations in different positions, a third embodiment of a control device according to the present invention.
• Figures 4a to 4f show, in different positions, a fourth embodiment of a control device according to the present invention.
• Figures 5a to 5c show two variants of a drive means comprising an elastic member for exerting a restoring force on the connecting element.
• Figure 5c is a section along the plane A-A of Figure 5b.
• the present invention relates to a control device of a clock mechanism comprising an isotropic harmonic oscillator, the device being intended to be integrated into a timepiece.
• FIG. 1a illustrates schematically and by way of example a first embodiment of such a device.
• This regulating device 1 comprises a non-illustrated rigid frame, two masses 2.1, 2.2 formed by horological balances rotatably mounted on said rigid frame about axes of rotation 2.1a, 2.2a.
• the regulating device 1 further comprises a drive means 3 adapted to be rotated by the movement of said timepiece around an axis of the oscillator 3a.
• the drive means 3 comprises a groove 3b extending in a substantially radial direction with reference to the axis of the oscillator 3a and in which is housed a connecting element 4 adapted to move along the groove and taking here the shape of a pin.
• the groove is arranged to ensure a minimum eccentricity to the connecting element to allow the start of the control device.
• the connecting element 4 is thus free in translation in a substantially radial direction with reference to the axis of the oscillator and passing through the connecting element 4 while it is kinematically connected to the driving means 3 according to a substantially orthoradial direction with reference to the axis of the oscillator 3a and the position of the connecting element 4.
• the regulating device 1 further comprises 5.1, 5.2 transmission means coupled, on the one hand, to said connecting element 4 and, on the other hand, to said masses 2.1, 2.2.
• the connecting means 5.1, 5.2 here take the form of rods connected to one another by a pivotally end via the connecting element 4 and pivotally mounted at their other end to the masses 2.1, 2, 2 via hinge pins 2.1b, 2.2b.
• orthoradial direction is meant, in the context of the invention, a direction perpendicular to the radial direction in
• the masses 2.1, 2.2, are placed on said rigid frame so that the two rigid rods 5.1, 5.2 are oriented substantially perpendicular to one another and so as to be
• the regulating device further comprises an elastic return element 6 tending to bring the connecting element towards the axis of the oscillator 3a.
• the elastic return member 6 is located at the drive means 3 as schematically shown in Figure 1a. This particular arrangement makes it possible to produce a return force common to all the masses 2.1, 2.2 via the connecting element 4 and transmission means 5.1, 5.2.
• the elastic return member 6 has an elastic constant K adapted to the target stabilized rotational frequency and adapted to provide a linear restoring force.
• FIGS 5a to 5c show two embodiments of a drive means 3 comprising an elastic return member 6 which can be integrated in a control device according to the first embodiment.
• the drive means 3 comprises a plate 7 driven in rotation by the gear of the timepiece around the axis of the oscillator 3a.
• the drive means 3 also comprises an elastic return element 6 in the form of an elastic blade fixed at one end to the plate 7 and exerting a substantially radial return force tending to bring the connecting element 4 towards the axis of
• the connecting element 4 cooperates, for example by
• the rocker 7b can guide the connecting element 4 on a substantially radial trajectory with reference to the drive means 3 and to the axis of
• An eccentric 35 makes it possible to adjust the rest position of the connecting element when the oscillator is at a standstill.
• the elastic return element 6 integrated in the drive means 3 in this case produces a return force common to all the masses.
• the drive of the gear causes a rotation of the drive means 3 which in turn causes a movement of the element of link 4.
• the two-dimensional planar displacement of the connecting element 4 is decomposed into two orthogonal linear displacements transmitted by the transmission means 5.1, 5.2 to masses 2.1, 2.2 which oscillate.
• the elastic return member 6 exerts a linear restoring force oriented substantially radially towards the axis of the oscillator 3a.
• the connecting element 4 describes a substantially circular or elliptical trajectory at a defined frequency which stabilizes the speed of rotation of the gear train.
• control device simplifies the manufacture and facilitate the calibration and adjustment of an isotropic oscillator, since it has only one elastic element of recall.
• FIG. 1b shows an oscillator comprising three masses 2.1, 2.2, 2.3 connected to the connecting element 4 by transmission means 5.1, 5.2, 5.3 in the form of connecting rods arranged angularly at about 120 ° each other.
• FIG. 1c shows an oscillator comprising four masses 2.1, 2.2, 2.3, 2.4 connected to the connecting element 4 by transmission means 5.1, 5.2, 5.3, 5.4 in the form of rods arranged angularly at about 90 ° from each other.
• the proposed four-axle configuration in which two opposite rockers have opposite rotational speeds, makes it possible to compensate for angular accelerations.
• FIG. 2 shows a schematic view of a second embodiment of a control device of a watch mechanism according to the present invention.
• the oscillator comprises four masses 2.1, 2.2, 2.3, 2.4, rotatably mounted on the rigid frame and arranged in a manner similar to those of Figure 1c.
• the elastic return element 6 of this regulating device is formed by the transmission means which realize a common force of return of the masses.
• the transmission means 5.1, 5.2, 5.3, 5.4 are made by a monolithic cross-shaped flexible structure whose arms have a rigidity chosen so as to serve simultaneously as transmission means and elastic return means masses 2.1, 2.2, 2.3, 2.4.
• the transmission is mainly in the longitudinal direction of the flexible arms and the restoring force is created mainly by the bending in the transverse direction of the flexible arms. Therefore, the common return force is achieved in this case by the flexible arms which serve both as means of transmission between the masses and the connecting element 4, coupling of the opposite masses, elastic return of the transverse masses and in the case where they are monolithic with the masses, hinge at their ends fixed on the masses.
• the ends of the flexible arms of the cross may advantageously be connected to the corresponding masses by a neck having a reduced section relative to the section of the transmission means in order to achieve a pivot connection.
• the common restoring force exerted by the flexible arms can be adjusted for example by the thickness, the height, and / or the length of the arms as well as by their manufacturing material.
• control device can be manufactured so that the masses 2.1, 2.2, 2.3, 2.4 and the flexible arms forming the transmission means are made by a monolithic piece, such as schematically illustrated in Figure 2.
• This has the advantage of offering the possibility of achieving a very flat regulating organ. It is of course possible to realize the control device using conventional techniques, that is to say to use separate parts for the masses and the flexible cross as well as to realize the joints of the arms on the masses in a traditional way using pivots.
• the embodiment presented with four oscillating masses is only an advantageous configuration of such an oscillator.
• the present invention also covers configurations having a flexible cross connected to three or more masses. Crosses having a number of even arms can be made with identical bending segments coupling two opposite masses together.
• FIGS 3a to 31 show two variants of a third embodiment of a control device according to the present invention, in different positions.
• the driving means 3 of this regulating device is illustrated only symbolically by the turntable.
• This control device comprises two pairs of masses 2.1, 2.3, 2.2, 2.4 in the form of rockers, each pair of masses comprising an elastic return element 6.1, 6.2 located between its two masses.
• each mass 2.1, 2.3, 2.2, 2.4 of the pairs of masses is connected by means of a transmission means 5.1, 5.3, 5.2, 5.4 in the form of connecting rods, 4.
• the masses are balanced and arranged so that the transmission means of a pair are arranged
• the connecting rods of a pair of masses are articulated on substantially diametrically opposite points of the rockers which causes oscillation in the opposite direction of the two rockers of a given pair of masses.
• the pivoting in opposite directions of the two rockers of a pair makes it possible to improve the insensitivity of the regulation device to the angular accelerations.
• Figures 3a to 3f show a first embodiment in which the rockers of each pair are coaxial and resiliently coupled to each other by elastic return elements 6.1, 6.2 in the form of spiral springs.
• Figures 3g to 31 show a second embodiment in which the rockers of a pair are coupled by a resilient biasing member 6.1, 6.2 in the form of a leaf spring and juxtaposed so that their respective transmission means are substantially parallel.
• the pairs of masses are arranged in such a way that the transmission means of one pair are substantially orthogonal to those of the other pair, thus making it possible to break down the plane displacement of the connecting element 4 in two.
• the elastic return elements 6.1, 6.2 are calibrated or adjusted so that the connecting element 4 is on the axis of the oscillator 3a when the two elastic return members are not deformed.
• the elastic return elements 6.1, 6.2 exert a torque tending to bring the rockers back to a neutral relative angular position by transmitting forces to the connecting element 4 whose resultant is a centripetal force tending to bring the connecting element 4 towards the axis of the oscillator 3a.
• a first advantage of this third embodiment is to correct the isochronism defects resulting from asymmetries due to the relative lateral displacement of the connecting element 4 relative to the articulation points of the transmission means on the masses, caused by the circular trajectory of the points of articulation and the variations of the orbital radius as a function of the engine torque.
• This configuration has another property of doubling the energy of the system without modifying the angular amplitude of the oscillation of the masses with reference to the frame or alternatively allows for the same energy, reduce this amplitude by half or reduce the size of the rockers. Indeed, the angular deformation of the elastic element is doubled for the same amplitude of oscillation of the masses with reference to the frame. This results in advantages in terms of isochronism due to the best respect of the desired theoretical linear trajectory for the points of articulation of the connecting rods as well as in terms of ease of integration due to the greater speed of relative rotation of the masses which allows to reduce the size without changing the inertia of the system.
• FIGS. 4a to 4f show a fourth embodiment of a device for regulating a clock mechanism comprising two masses 2.1, 2.2 which are preferably coaxial and which are elastically coupled by an elastic return element 6 situated between the two masses. 2.1, 2.2.
• the two masses are connected to the connecting element by transmitting elements 5.1, 5.2 substantially perpendicular when the elastic element 6 is at rest, for example in the configurations shown in Figures 4c and 4e. In this configuration the points of articulation of the connecting elements on the masses are shifted by 90 ° with reference to the pivot axis of the masses.
• This configuration has the same advantages as the third embodiment with the additional advantage of being able to achieve an oscillator having only two rotating masses that allows both to design a spectacular oscillator with masses of large dimensions oscillating at low frequency or a very compact oscillator easily integrable.
• control devices of a clock mechanism all comprise an elastic return element located between at least two of the masses 2.1, 2 , 2, 2,3, 2,4 and arranged so as to achieve a common restoring force for at least a subset of the masses 2.1, 2,2, 2,3, 2,4.
• this arrangement simplifies the construction, calibration or adjustment of such a device compared to those of the prior art. It is of course possible to combine the different embodiments with each other in particular by using a drive means similar to that shown in Figures 5a to 5c with embodiments two to four.
• the pivot connections of the oscillating masses on the frame and the connecting elements on the masses can be made in a traditional manner or in a monolithic manner with deformable flexible elements due to the limited angular amplitude of the oscillations.
• the stiffness of the flexible elements carrying the pivot connections remains low compared to that of the elastic return element.
• the device comprises at least one elastic return element 6, 6.1, 6.2 arranged so as to achieve a common return force is at least one subset is to all of said masses 2.1, 2.2, 2.3, 2.4.
• the elastic return elements are not located between the masses and the rigid frame and no mass has a particular elastic return element, so as to form a separate resonator with this mass.
• the present invention also relates to a watch movement incorporating such a control device and a timepiece comprising such a movement.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Electric Clocks (AREA)
• Micromachines (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=66664745

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (13)

• 2018
  • 2018-10-02 JP JP2020539154A patent/JP7000585B2/ja active Active
  • 2018-10-02 CN CN201880064220.7A patent/CN111344640A/zh active Pending
  • 2018-10-02 WO PCT/IB2018/057658 patent/WO2019106448A1/fr unknown
  • 2018-10-02 US US16/650,423 patent/US20210208537A1/en not_active Abandoned
  • 2018-10-02 EP EP18780251.7A patent/EP3692418A1/de not_active Withdrawn

Also Published As

Similar Documents

Legal Events