EP3373081B1 - Mouvement horloger muni d'un dispositif de positionnement d'un élément mobile dans une pluralité de positions discrètes - Google Patents

Mouvement horloger muni d'un dispositif de positionnement d'un élément mobile dans une pluralité de positions discrètes Download PDF

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Publication number
EP3373081B1
EP3373081B1 EP17159366.8A EP17159366A EP3373081B1 EP 3373081 B1 EP3373081 B1 EP 3373081B1 EP 17159366 A EP17159366 A EP 17159366A EP 3373081 B1 EP3373081 B1 EP 3373081B1
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EP
European Patent Office
Prior art keywords
magnetic
movable element
lever
magnet
torque
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
EP17159366.8A
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German (de)
English (en)
French (fr)
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EP3373081A1 (fr
Inventor
Davide Sarchi
Deirdré LENOIR
Benoît LÉGERET
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.)
Montres Breguet SA
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Montres Breguet SA
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Publication date
Application filed by Montres Breguet SA filed Critical Montres Breguet SA
Priority to EP17159366.8A priority Critical patent/EP3373081B1/fr
Priority to US15/905,856 priority patent/US10520891B2/en
Priority to JP2018032815A priority patent/JP6486520B2/ja
Priority to CN201810184035.3A priority patent/CN108535997B/zh
Publication of EP3373081A1 publication Critical patent/EP3373081A1/fr
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Publication of EP3373081B1 publication Critical patent/EP3373081B1/fr
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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
    • G04B33/00—Calibers
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a timepiece provided with a device for positioning a movable element in a plurality of discrete positions.
  • the invention relates to a device for positioning a date ring in a plurality of display positions.
  • the discs or rings used for displaying calendar data are held in any one of the plurality of display positions by a sautoir (also called spring-jumper).
  • This jumper presses continuously against a toothing of the disc or of the ring in question.
  • the toothing is configured so that the torque exerted on the jumper by its spring is minimal in the display positions and that, when driving the disc or the ring, the jumper passes through a torque peak. .
  • the document FR 2,221,764 describes a magnetic positioner whose position can be adjusted.
  • the magnetic positioning system is formed of a magnet arranged between two ferromagnetic plates on the side of the respective first ends of these plates.
  • the two plates define between their respective second ends an air gap through which a magnetic flux from the magnet passes and into which the teeth of a wheel successively penetrate.
  • the teeth are also made of a ferromagnetic material so that they are attracted to the two pads.
  • This magnetic system defines stable positions of the toothed wheel corresponding to the succession of teeth located in the middle of the two plates.
  • the document US 4,409,576 describes an electrical switch having two stable switching positions along a linear axis in the direction of which the magnetic axes of two magnets forming this electrical switch are aligned.
  • the first magnet is applied against a ferromagnetic part to which it adheres at least magnetically.
  • the ferromagnetic part is arranged between the two magnets.
  • the second magnet is integral in translation with a shuttle that can be actuated manually between the two switching positions.
  • the magnetic system formed by the two magnets and the ferromagnetic part makes it possible to maintain the shuttle stably in the two switching positions, thus defining a bistable system.
  • the present invention relates to a watch movement comprising a movable element, capable of being driven along a displacement axis and of being momentarily immobilized in any stable position among N discrete stable positions, and a device for positioning this movable element in each. of these N stable positions, N being a number greater than one (N> 1). It is intended to provide an efficient positioning device, namely which ensures positioning in the stable positions, and which consumes relatively little power to move from one stable position to a next stable position.
  • the positioning device comprises a latch, capable of coming into contact with the movable element, and a magnetic system formed of a first magnet integral with the latch and arranged at the periphery of the movable element, of N second magnets integral with this mobile element and arranged along a displacement axis so as to define magnetic periods corresponding respectively to the distances between the N discrete stable positions, and of an element with high magnetic permeability arranged in front of a polar end of the first magnet located on the side of the mobile element.
  • the magnetic system is arranged so that, when the movable element is driven along its axis of movement from any stable position to a next stable position, a first magnetic torque, exerted on the rocker carrying the first magnet by the magnetic system, presents a first direction on a first section and a second direction, opposite to the first direction, on a second section of the corresponding distance, the first direction corresponding to a torque which presses the lever against the movable element while the second direction tends to move apart the rocker of this mobile element.
  • the magnetic system is arranged so that, for each of the N discrete stable positions, the first magnetic torque is applied in the first direction.
  • the first magnet and the second magnets are arranged obliquely relative to the axis of movement of the mobile element.
  • the polarity of the first magnet is substantially opposite to those of the second magnets when they are presented successively facing the first magnet.
  • the respective magnetic axes of the first magnet and of the second magnets each have substantially the same angle with the axis of movement.
  • the magnetic system 2 comprises a first fixed magnet 4, an element with high magnetic permeability 6 and a second magnet 8 which is movable, along a displacement axis coinciding here with the alignment axis 10 of these three magnetic elements, relative to the assembly formed by the first magnet 4 and the element 6.
  • the element 6 is arranged between the first magnet and the second magnet, close to the first magnet and in a position determined in relation to it.
  • the distance between element 6 and magnet 4 is less than or substantially equal to one tenth of the length of this magnet along its magnetization axis.
  • Element 6 consists, for example, of a carbon steel, tungsten carbide, nickel, FeSi or FeNi, or other alloys with cobalt such as Vacozet® (CoFeNi) or Vacoflux® (CoFe).
  • this element with high magnetic permeability consists of a metallic glass based on iron or cobalt.
  • Element 6 is characterized by a saturation field Bs and a permeability ⁇ .
  • the magnets 4 and 8 are for example made of ferrite, FeCo or PtCo, rare earths such as NdFeB or SmCo. These magnets are characterized by their remanent field Br1 and Br2.
  • the high magnetic permeability element 6 has a central axis which is preferably substantially coincident with the magnetization axis of the first magnet 4 and also with the magnetization axis of the second magnet 8, this central axis being here coincident with the alignment axis 10.
  • the respective magnetization directions of the magnets 4 and 8 are opposite. These first and second magnets therefore have opposite polarities and they are capable of undergoing relative movement between them over a certain relative distance.
  • the distance D between the element 6 and the mobile magnet 8 indicates the distance of this mobile magnet relative to the assembly formed of the other two elements of the magnetic system.
  • the axis 10 is provided here linear, but this is a non-limiting variant.
  • the displacement axis can also be curved, as in the embodiments which will be described below.
  • the central axis of the element 6 is preferably approximately tangent to the curved axis of displacement of the mobile magnet and thus the behavior of such a magnetic system is, in a first approximation, similar to that of the magnetic system described here. This is all the more true as the radius of curvature is large relative to the maximum possible distance between the element 6 and the mobile magnet 8.
  • the element 6 has dimensions in a plane orthogonal to the central axis 10 which are greater than those of the first magnet 4 and those of the second magnet 8 in projection in this orthogonal plane. It will be noted that, in the case where the second mobile magnet abuts at the end of its travel against the element with high magnetic permeability, this second magnet advantageously comprises a hardened surface or a thin layer of hard material on its surface.
  • the two magnets 4 and 8 are arranged in magnetic repulsion so that, in the absence of the element with high magnetic permeability 6, a force of magnetic repulsion tends to move these two magnets away from each other.
  • the arrangement between these two magnets of the element 6 reverses the direction of the magnetic force exerted on the mobile magnet when the distance between this mobile magnet and the element 6 is sufficiently small, so that the moving magnet then undergoes a force of magnetic attraction.
  • Curve 12 of the Figure 2 represents the magnetic force exerted on the mobile magnet 8 by the magnetic system 2 as a function of the distance D between the mobile magnet and the element with high magnetic permeability.
  • the mobile magnet undergoes, over a first range D1 of the distance D, overall a magnetic force of attraction which tends to maintain the mobile magnet against the element 6 or to bring it back towards it in the event of 'distance, this overall force of attraction resulting from the presence of the element with high magnetic permeability (in particular ferromagnetic) between the two magnets, which allows a reversal of the magnetic force between two magnets arranged in magnetic repulsion, while this mobile magnet undergoes, on a second range D2 of the distance D, overall a magnetic repulsion force.
  • This second range corresponds to distances between element 6 and magnet 8 which are greater than the distances corresponding to the first range of distance D.
  • the second range is practically limited to a maximum distance D max which is generally defined by a stop limiting the distance of the moving magnet.
  • the magnetic force exerted on the mobile magnet is a continuous function of the distance D and it therefore has a zero value at the distance D inv for which there is an inversion of this magnetic force ( Figure 2 ).
  • the inversion distance D inv is determined by the geometry of the three magnetic parts forming the magnetic system and by their magnetic properties. This inversion distance can therefore be selected, to a certain extent, by the physical parameters of the three magnetic elements of the magnetic system 2 and by the distance separating the fixed magnet from the ferromagnetic element 6.
  • the element with high magnetic permeability 34 is carried by the rocker 26 and it is therefore integral with the first magnet 30 in front of which it is arranged.
  • This element 34 is aligned with the direction of the magnetic axis 31 of the first magnet 30. It can be glued against the end surface 36 of this first magnet.
  • This element is for example made of a ferromagnetic material.
  • the first magnet and the second magnets 32 are arranged obliquely relative to the axis of displacement 24.
  • the respective magnetic axes 31 and 33 of the first magnet and of the second magnets are parallel to an oblique axis 38. They thus each have substantially one. same angle with the axis of movement.
  • the first magnet has a polarity opposite to that of each of the second magnets which is presented opposite it in a different discrete stable position.
  • this latter characteristic generally means that, in projection on the oblique axis 38, the polarity of the first magnet is reversed relative to the polarities of the second magnets.
  • the horological movement comprises a first fixed stop 40.
  • it comprises a second fixed stop 42 which limits the rotation of the contact part of the rocker, more generally of the formed magnetic assembly of the first magnet and the high magnetic permeability element, in a direction away therefrom relative to the movable element.
  • the magnetic system 28 takes advantage of the physical phenomenon described previously in relation to the Figures 1 and 2 . Its operation is shown by the sequence of Figures 3A to 3D .
  • the movable element 22 is in a stable position P n-1 .
  • Each stable position is defined in particular by the magnets 32 fixedly carried by the mobile element, in particular by the periodic arrangement of these magnets 32 which define the magnetic period P M , which corresponds to the distance of displacement of the mobile element for move from any stable position to a next stable position.
  • the succession of stable positions can be defined by a graduation, along the axis of displacement, which moves with the mobile element, this graduation being formed by a series of references ..., P n-1 , P n , P n + 1 , ... which are successively aligned with a reference axis A REF , which is fixed relative to the watch movement, when the mobile element is driven by a mechanism provided for this purpose successively in the plurality of discrete stable positions.
  • This reference axis A REF is perpendicular to the displacement axis (here a linear axis 24) and it passes through the center of the first pin 40 (the latter defining the closed position of the rocker).
  • the second pin 42 is also aligned with the reference axis.
  • each stable position of the movable element is given by a configuration in which the rocker is in its closed position and a second different magnet resting against the magnetic element 34. It will be noted that an arm of the rocker passes between the two pins, so that the rotational movement around its axis of rotation 27 is limited in both directions respectively by these two pins.
  • the open position of the latch corresponds to a configuration where this latch bears against the second pin 42. It will be described in more detail below.
  • the Figures 3B to 3D show, for the first embodiment, the operation of the magnetic device for positioning the movable element 22 when the latter is driven by a drive mechanism (known to those skilled in the art) from any stable position (position P n-1 ) to a next stable position (position P n ).
  • the Figure 3B shows a state of the magnetic system 28 in which the magnetic force exerted on the rocker has decreased and its orientation has changed relative to the magnetic positioning force of the rocker.
  • Figure 3A On this Figure 3B , we see that the magnetic torque which is exerted on the rocker has just changed direction, going from a clockwise direction to a counterclockwise direction.
  • the rocker is no longer resting against the pin 40 and it begins to undergo an opening rotation (rotation around the axis 27 in the counterclockwise direction).
  • the opening is carried out quickly, that is to say over a short distance of movement of the movable element and the rocker then passes to its open position. represented at the Figure 3C .
  • the magnetic force exerted on the magnetic assembly carried by the rocker is a magnetic force of repulsion. It is therefore observed that the magnetic force which is exerted on this magnetic assembly is a vector which rotates as a function of the position of the mobile element between two stable positions.
  • the magnetic positioning device is remarkable in that not only does it ensure the positioning of the movable element in each of its stable positions, but in addition it opens the rocker during training and thus momentarily removes any pressure from this. Tilt against the movable element, the latter then being free and can be moved over a certain section without mechanical stress on the part of the rocker.
  • the automatic opening of the rocker allows the magnetic assembly to then come opposite a second adjacent magnet to move to a next stable position, as shown in 3d figure .
  • This 3d figure represents a state, during the training of the movable element, for which the overall magnetic force exerted on the rocker has decreased again and its orientation again generates a magnetic torque on the rocker which brings it back to its position closed.
  • the magnetic system quickly returns to a state corresponding to that of the Figure 3A and for which the movable element is again in a stable position with a second magnet in contact with the magnetic element and the rocker resting against the pin 40.
  • the positioning device is arranged so that, when the movable element is driven along its axis of movement from any stable position to a next stable position, a first magnetic torque exerted on the rocker carrying the first magnet has a first direction on a first section and a second direction, opposite to the first direction, on a second section of the corresponding distance, the first direction defining a return torque in the direction of the movable element for a part switch contact point.
  • the magnetic system is arranged so that, for each of the N discrete stable positions, the aforementioned first magnetic torque is applied in said first direction.
  • the watch movement of the second embodiment differs from the first embodiment firstly by the fact that the movable element comprises, instead of the first pin, a toothing 48 against which a contact portion 46 of the latch 26A at least when the magnetic torque is applied clockwise to this latch, and secondly by the fact that the latch 26A is associated with a spring 52 which exerts, at least on an intermediate section between two stable positions of the movable element 22A, an elastic force on the rocker so as to generate a mechanical return torque which pushes the contact part 46 of this rocker in the direction of the movable element.
  • the positioning device 44 is arranged so that the overall magnetic force 50 exerted on the magnetic assembly carried by the rocker has an orientation substantially perpendicular to the direction of movement of the movable member when the contact part (part end) of the lever is located at the bottom of the teeth, that is to say in a hollow between two adjacent teeth, as shown in Figure 4A .
  • the magnetic torque in this state defines a return torque in the direction of the mobile element, the overall magnetic force which applies to the rocker then being a force of magnetic attraction.
  • the teeth and the rocker are arranged so that the contact part 46 of the rocker is located at the bottom of the teeth for each of the N discrete stable positions of the mobile element.
  • the Figure 4B shows an intermediate state of the positioning device 44 when changing from a stable position to a next stable position.
  • the toothing 48 in addition to retaining the lever in its closed position shown in Figure 4A to position the movable element, moves its end portion 46 away from the movable element when this movable element is driven from a stable position. Indeed, the rocker must withdraw to pass over a tooth of the set of teeth, the contact portion 46 for this purpose climbing a flank of the adjacent tooth.
  • the distance between the magnetic assembly carried by the rocker and the magnet 32, ensuring the positioning in the stable position increases more rapidly than in the case of the first embodiment, which has the consequence that the magnetic force vector rotates rapidly and the distance over which a magnetic torque is applied to the rocker clockwise (first direction) decreases and becomes relatively short.
  • the elastic force exerted by the spring 52 increases during the passage of the contact part over the tooth.
  • the rigidity of the spring is chosen so that the rocker moves away only slightly from the toothing when the magnetic torque applied to the rocker changes direction (second direction) or so that the rocker remains continuously in contact with the toothing when moving from a stable position to a next stable position.
  • the magnetic system, the profile of the teeth and the stiffness of the spring can be optimized so as to minimize the mechanical stresses on the contact part of the rocker, making so that the magnetic torque exerted in the counterclockwise direction (second direction) or substantially compensated by the mechanical torque of the spring which is exerted in the opposite direction, namely in the clockwise direction.
  • the teeth also have the advantage of ensuring correct passage without risk of blocking from one stable position to another. Indeed, the contact part cannot be blocked by a magnet 32, because the magnets 32 are arranged so as not to protrude out of the profile of the teeth.
  • FIG. 5A to 5C relate to a first variant similar to the second mode of claim. It will be noted that a second variant without spring and without toothing is also provided, which is thus similar to the first embodiment.
  • This third embodiment is mainly distinguished of the two previous embodiments in that the movable element has an annular shape, this movable element being arranged to rotate on itself so that the axis of movement is a circular axis.
  • the mobile element here is a date ring. More generally, the mobile element forms a display medium for calendar data.
  • the references already described will not be described again here and the references corresponding to elements already described will not be described in detail here. Reference will be made to the preceding Figures.
  • the Figure 5A shows the date ring 22B and the positioning device in a state corresponding to a stable display position of this ring.
  • the magnetic system and the teeth 48B are arranged so that, in this display position, the contact part 46B is inserted into a notch 56 of the teeth 48B, and so that the overall magnetic force exerted on the assembly magnetic carried by the lever 26B is radial, that is to say perpendicular to the axis of circular displacement 24B of the ring.
  • the teeth here have a generally circular profile with a plurality of notches defining the display positions.
  • the first magnet has a polarity substantially opposite to that of each of the second magnets which is presented opposite it in a different discrete stable position.
  • the magnetic system exerts, in reaction to the magnetic force which is exerted on the rocker, a magnetic force on the ring by means of the magnets 32 which are fixed to this ring.
  • the magnetic force acting on the magnets 32 generates a second magnetic torque which is applied directly to the ring.
  • this second magnetic torque has a substantially zero value, corresponding to a stable magnetic equilibrium position for the mobile element, while the first magnetic torque applied to the latch is in the first direction, that is that is to say in a direction which pushes the contact part 46B in the direction of the ring and in particular of its teeth 48B.
  • the ring and the latch are arranged so that each of the N discrete stable positions of the ring substantially corresponds to a stable magnetic position, as is the case with the Figure 5A .
  • the positioning device When driving the ring from one display position to a next display position, the positioning device goes through a configuration shown in Figure 5B , which shows a state where the flip-flop 26B is in an open position.
  • the first magnetic torque applied to the rocker is here in the clockwise direction (which in the third embodiment is equivalent to the second direction) and it is expected to be greater than the mechanical torque generated by the spring 52. This mechanical torque defines a return torque in direction of toothing 48B.
  • this return torque is expected to be of low value, its role being to ensure that the rocker can return to a position where the magnetic assembly that it carries again undergoes a magnetic attraction force and can thus return to a closed position when the end portion 46B comes in front of a new notch 56 when changing to a new stable display position.
  • the force of the spring is dimensioned to ensure that the contact part of the rocker comes back to bear against a circular segment of the profile of the teeth.
  • no spring is associated with the lever.
  • the latter can advantageously be made of a ferromagnetic material.
  • the magnet 30 is then attracted by the pin as it approaches it.
  • the Figure 5C corresponds to a state close to the reversal of the magnetic force which applies to the magnetic assembly carried by the rocker.
  • the first magnetic couple then begins to exert again in the first direction and to recall the end part of the rocker in the direction of the ring.
  • the rocker comes back to rest against the toothing 48B and finally its end part penetrates the following notch to position the date ring in a next display position (we then find sacred in a situation corresponding to the Figure 5A ).
  • the Figures 6 and 7 relate to the magnetic torques applied respectively to the latch and to the date ring of the third embodiment, in a variant without toothing and without a spring for the curve of the functional magnetic torque acting on the latch. It will be noted that similar curves are observed for the rocker and the movable element of the first embodiment.
  • the remanent field of the magnets (Neodymium Iron Boron) has a value of 1.35 T and the saturation field of the element made of ferromagnetic material (Vacoflux®) is equal to 2.2 T.
  • a first curve 60 giving the magnetic torque exerted on the rocker when the latter is in its open position and the ring is driven over a distance slightly greater than an angular period
  • a second curve 62 giving the magnetic torque exerted on the rocker when the latter is in its closed position, for an angular path identical to that of the curve 60
  • a third curve 64 representing approximately the functional magnetic torque applied to the latch over each angular period, this functional magnetic torque defining the first magnetic torque.
  • the curve 64 of the couple functional is an approximation of the real behavior since the position of the lever does not depend only on the first magnetic couple but also on the profile of the toothing 48B, on the profile of the end part 46B of this lever and on the mechanical torque generated by the spring 52 (note that the couple functional represented corresponds in fact to an embodiment without spring and without toothing). It is noted that the notches 56 have a profile designed to mechanically position the ring with little play and to maintain it correctly in the display positions. Thus, in this case, the curve 64 only meets the curve 62 in the angular zones close to the stable display positions P n . Be that as it may, the functional magnetic torque corresponds substantially to that of the curve 62 for each of the display positions P n .
  • the first direction corresponds to a return torque in the direction of the movable ring for the contact part of the rocker, while the second direction tends to move this contact part away from the ring and in particular from its toothing 48B.
  • the magnetic system is arranged so that, for each position P n of the N discrete stable positions (display positions), the first magnetic torque is exerted in the aforementioned first direction.
  • the first magnetic couple (functional couple 64) has a maximum negative value (in absolute value) for an angular position close to each discrete stable position P n .
  • this maximum negative value is reached substantially at each discrete stable position P n .
  • a first curve 66 giving the magnetic torque applied directly to the movable ring when the rocker is in an open position and this ring is driven over the same angular distance as at the Figure 6 ; a second curve 68 giving the magnetic torque applied directly to the ring when the rocker is in a closed position; and a third curve 70 representing the functional magnetic torque applied directly to the ring over each angular period, this functional magnetic torque defining a second magnetic torque intervening in the positioning device of the invention.
  • the curve 68 is theoretical, since the rocker cannot be maintained in a closed position when driving the ring over an entire angular period.
  • the curve 70 of the functional torque is an approximation of the actual behavior in a variant with a toothing and / or a spring.
  • the second magnetic torque has a substantially zero value at the position P n defining the start of an angular period between two display positions.
  • the ring 22B is in a stable magnetic position because the positive slope of the curve 70 at this position P n indicates that the second magnetic couple tends to bring the ring back towards this position when it deviates from it.
  • the ring and the latch are arranged so that each of the N discrete stable positions corresponds to a stable magnetic position.
  • the first magnetic torque is applied to the flip-flop in the first direction when the ring is in any position of stable magnetic equilibrium.
  • the first magnetic torque applied to the rocker has, in absolute values, a value greater than two thirds of the maximum value of this first magnetic torque in the first section.
  • the second magnetic torque 70 has a positive value in each angular period on a first section and a negative value on a second section. Note that the magnetic force is conservative.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Electromechanical Clocks (AREA)
  • Transmission Devices (AREA)
  • Electromagnets (AREA)
EP17159366.8A 2017-03-06 2017-03-06 Mouvement horloger muni d'un dispositif de positionnement d'un élément mobile dans une pluralité de positions discrètes Active EP3373081B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17159366.8A EP3373081B1 (fr) 2017-03-06 2017-03-06 Mouvement horloger muni d'un dispositif de positionnement d'un élément mobile dans une pluralité de positions discrètes
US15/905,856 US10520891B2 (en) 2017-03-06 2018-02-27 Timepiece movement provided with a device for positioning a moveable element in a plurality of discrete positions
JP2018032815A JP6486520B2 (ja) 2017-03-06 2018-02-27 複数の離散的な位置に可動要素をポジショニングするデバイスを備える計時器用ムーブメント
CN201810184035.3A CN108535997B (zh) 2017-03-06 2018-03-06 设有定位装置的钟表机芯

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17159366.8A EP3373081B1 (fr) 2017-03-06 2017-03-06 Mouvement horloger muni d'un dispositif de positionnement d'un élément mobile dans une pluralité de positions discrètes

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EP3373081A1 EP3373081A1 (fr) 2018-09-12
EP3373081B1 true EP3373081B1 (fr) 2021-05-26

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US (1) US10520891B2 (ja)
EP (1) EP3373081B1 (ja)
JP (1) JP6486520B2 (ja)
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DE1673676B1 (de) * 1967-05-03 1972-05-31 Walter Dr Nissen Datumsanzeigevorrichtung
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CN108535997B (zh) 2020-04-10
JP6486520B2 (ja) 2019-03-20
CN108535997A (zh) 2018-09-14
JP2018146575A (ja) 2018-09-20
US10520891B2 (en) 2019-12-31
US20180253060A1 (en) 2018-09-06
EP3373081A1 (fr) 2018-09-12

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