EP3327518A1 - Timepiece comprising a switching device of a clockwork mechanism - Google Patents
Timepiece comprising a switching device of a clockwork mechanism Download PDFInfo
- Publication number
- EP3327518A1 EP3327518A1 EP16201163.9A EP16201163A EP3327518A1 EP 3327518 A1 EP3327518 A1 EP 3327518A1 EP 16201163 A EP16201163 A EP 16201163A EP 3327518 A1 EP3327518 A1 EP 3327518A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching
- control
- rocker
- magnet
- magnetic permeability
- 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
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 30
- 230000005291 magnetic effect Effects 0.000 claims abstract description 126
- 230000035699 permeability Effects 0.000 claims abstract description 44
- 230000003993 interaction Effects 0.000 claims abstract description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910002546 FeCo Inorganic materials 0.000 description 1
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 229910005347 FeSi Inorganic materials 0.000 description 1
- 241001415961 Gaviidae Species 0.000 description 1
- 229910002837 PtCo Inorganic materials 0.000 description 1
- 229910001333 Vacoflux Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
- G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
- G04F7/08—Watches or clocks with stop devices, e.g. chronograph
- G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
- G04F7/0857—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with single push-button or actuation member for start-stop and reset
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
- H01H36/0073—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by relative movement between two magnets
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B1/00—Driving mechanisms
- G04B1/10—Driving mechanisms with mainspring
- G04B1/22—Compensation of changes in the motive power of the mainspring
- G04B1/225—Compensation of changes in the motive power of the mainspring with the aid of an interposed power-accumulator (secondary spring) which is always tensioned
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B11/00—Click devices; Stop clicks; Clutches
- G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
- G04B11/005—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with magnetic elements
-
- 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
- G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
- G04B3/04—Rigidly-mounted keys, knobs or crowns
- G04B3/048—Operation exclusively by axial movement of a push-button, e.g. for chronographs
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C5/00—Electric or magnetic means for converting oscillatory to rotary motion in time-pieces, i.e. electric or magnetic escapements
- G04C5/005—Magnetic or electromagnetic means
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
- G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
- G04F7/08—Watches or clocks with stop devices, e.g. chronograph
- G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
- G04F7/0852—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms with member having a rotational two-way movement, e.g. navette
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
- G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
- G04F7/08—Watches or clocks with stop devices, e.g. chronograph
- G04F7/0842—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms
- G04F7/0861—Watches or clocks with stop devices, e.g. chronograph with start-stop control mechanisms actuated by other than push-buttons, e.g. bezel or lever
Definitions
- the present invention relates to a switching device of a clock mechanism between two functional states.
- the present invention relates to a timepiece comprising a mechanism that can switch between a first state and a second state, a switching device of this mechanism and an actuating device of this switching device.
- the switching device comprises a control member actuated by the actuating device and a switching member that can be placed on command from a first stable position, for which the mechanism is in its first state, to a second stable position, for which mechanism is in its second state, and vice versa.
- the invention relates to a device for clutching a mechanism of a mechanical watch movement.
- the patent application EP 2 897 003 discloses a conventional clutch device for a chronograph mechanism.
- This clutch device comprises an intermediate wheel which, when the clutch is engaged (device in the engaged state), meshes simultaneously with a chronograph wheel and a driving wheel and which, when the clutch is tripped (device in disengaged state), is removed from at least one of these two wheels to break the kinematic chain between them.
- the clutch device comprises a clutch rocker which carries the intermediate wheel at the end of one of its two arms and which is associated with a first return spring so that the end of the second arm of this clutch rocker remains in support against a column wheel.
- the column wheel thus forms a kind of cam and the aforementioned end of the clutch rocker forms a cam follower.
- a large rocker which carries at one end a pivoted ratchet and associated with a second return spring.
- the conventional clutch mechanism described above is complex. It comprises several rotated members including a column wheel which is a complex piece and therefore relatively expensive.
- the two aforementioned springs generate frictional forces in the areas of mechanical contact provided, which generate wear.
- such springs are fragile and may have an elasticity that varies with age.
- the various members must be precisely mounted in the timepiece to be functional, including the operating ratchet of the column wheel and the large rocker that causes the reciprocating movement of the pawl.
- the object of the present invention is to propose a device for switching a watch mechanism of a type different from the aforementioned conventional device and which eliminates several disadvantages of such a conventional device.
- the control member is arranged such that, when actuated repeatedly by the actuating device, the first high-magnetic-permeable element is reciprocated (reciprocating) between a first position control and a second control position.
- the switching device is arranged in such a way that, when the first high magnetic permeability element is in its first control position, the first and second magnets generate between them a magnetic repulsion force over substantially the whole of the switching path and so that when the first element with high magnetic permeability is in its second control position, the first and second magnets generate between them a magnetic attraction force on at least a part of the switching path, this part being located on the side of the second bipolar magnet.
- a spring of relatively low return force is provided in addition to the magnetic switching device to participate in the displacement of the switching member in one direction and / or help maintaining this switching member in one of its stable positions.
- a spring can act on the switching member for, when the first element with high magnetic permeability is in its second control position, move this switching member on a first part the switching path located on the side opposite the second bipolar magnet, until the magnetic attraction force intervenes to attract the switching member towards the second bipolar magnet.
- the repulsive magnetic force has an intensity and a range that are sufficient for it to operate alone the switching member between its first stable position and its second stable position and then maintain it in this second position. stable position; while the magnetic attraction force has an intensity and a range that are sufficient for it to operate alone the switching member between its second stable position and its first stable position and then maintain it in this first stable position.
- the magnetic switching device defines a bistable system. Moreover, in the preferred embodiment, mentioned above, this device for switching does not require any return spring associated with the switching member.
- the control member is formed by a rocker pivoted so that the high magnetic permeability element undergoes a rotational movement between two determined angular positions when the control rocker is actuated.
- a rocker is a simpler piece to achieve a column wheel.
- the control rocker is pivoted so that the first high magnetic permeability element is rotated between a first angular position and a second angular position respectively defining the first control position and the second control position. Then, when the first element with high magnetic permeability is in its second angular position, this first element is substantially located on an alignment axis defined by the magnetic axis of the second bipolar magnet so that it is substantially between the first and second and second bipolar magnets.
- the first element with high magnetic permeability is spaced from the aforementioned alignment axis.
- control lever does not require a pawl pivoted and associated with a return spring. It will also be noted that the magnetic system makes it possible to avoid any contact between the control member and the switching member.
- the switching path of the first bipolar magnet is substantially coincident with the alignment axis defined by the magnetic axis of the second bipolar magnet and this first bipolar magnet is arranged with its magnetic axis substantially oriented along this axis. alignment, the first and second bipolar magnets being arranged with their polarities opposite.
- the magnetic system 2 comprises a first fixed magnet 4, a high magnetic permeability element 6 and a second magnet 8 which is movable along an axis of displacement here confused with the alignment axis 10 of these three magnetic elements, relative to the assembly formed by the first magnet 4 and the element 6.
- This element 6 is arranged between the first magnet and the second magnet, close to the first magnet and in a specific position relative thereto.
- the distance between the element 6 and the magnet 4 is less than or substantially equal to one-tenth of the length of this magnet along its axis of magnetization.
- the element 6 is constituted for example of a carbon steel, tungsten carbide, nickel, FeSi or FeNi, or other alloys with cobalt as the Vacozet ® (CoFeNi) or Vacoflux ® (CoFe).
- this element with high magnetic permeability consists of a metal 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 ferrite, FeCo or PtCo, rare earths such as NdFeB or SmCo. These magnets are characterized by their remanent field Br1 and Br2.
- the element with high magnetic permeability 6 has a central axis which is preferably substantially coincidental 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 confused 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 likely to undergo relative movement between them over a certain relative distance.
- the distance D between the element 6 and the movable magnet 8 is indicated in Figures 1 and 2 .
- the axis 10 is provided here linear, but this is a non-limiting variant.
- the axis of displacement can also be curved, as in the embodiment which will be described later.
- the central axis of the element 6 is preferably approximately tangent to the axis of curved displacement and thus the behavior of such a magnetic system is, in a first approximation, similar to that of the magnetic system described here. .
- the radius of curvature is large relative to the maximum possible distance between the element 6 and the movable 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.
- the second magnet advantageously comprises a cured 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 magnetic repulsion force tends to move these two magnets away from each other. Surprisingly, however, the arrangement between these two magnets of the element 6 reverses the direction of the magnetic force exerted on the moving magnet when the distance between this movable magnet and the element 6 is sufficiently small, so that the moving magnet then undergoes a magnetic attraction force.
- Curve 12 of the Figure 2 represents the magnetic force exerted on the movable magnet 8 by the magnetic system 2 as a function of the distance D between the movable magnet and the element with high magnetic permeability 6.
- the moving magnet undergoes, on a first range D1 of the distance D, globally a magnetic attraction force which tends to maintain the magnet 8 against the element 6 or to bring it back towards the latter in the event of removal, this overall force of attraction resulting from the presence of the element with high magnetic permeability (In particular ferromagnetic) which allows a reversal of the magnetic force between two magnets arranged in magnetic repulsion.
- the element 6 and the two magnets are arranged so that the second magnet 8 undergoes, on a second range D2 of the distance D, globally a magnetic repulsion force.
- This second range corresponds to distances between the element 6 and the magnet 8 which are greater than the distances corresponding to the first range of the distance D.
- the second range is limited by 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 moving magnet is a continuous function of the distance D and it therefore has a value of zero at the distance D inv for which this magnetic force is inverted.
- 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. It is the same for the evolution of the slope of the curve 12, the variation of this slope and in particular the intensity of the attractive force when the moving magnet approaches the ferromagnetic element can thus be adjusted .
- the watch movement 22 comprises a chronograph mechanism 24 partially represented by the chronograph wheel 26.
- this chronograph mechanism can switch between a first disengaged state, that is to say at rest, and a second state. engaged in which the chronograph wheel 26 is kinematically coupled to the wheel coach 28 of the watch movement.
- a switching device of the chronograph mechanism forming a clutch device 30 of this mechanism, and an actuating device 32 of this clutch device.
- the clutch device 30 comprises a control member, formed by a control rocker 34 actuated by the actuating device, and a switching member 36 which comprises a clutch rocker 38 mounted on a plate 23, a bridge of flip-flop 40 and a clutch wheel 42 rotated between this rocker and this bridge.
- the switching member 36 is able to place on command a first stable position ( Figure 3 ), in which an arm of the lever 38 bears against the stop 44 and the clutch wheel in a position not engaged with the chronograph wheel, at a second stable position ( Figure 4 ), wherein the aforementioned arm of the rocker 38 is in abutment against the stop 45 and the clutch wheel in a position meshing with the chronograph wheel; and vice versa.
- a first bipolar magnet 50 is attached to a first end of the latch 38 which is pivoted about an axis 46 at its second end.
- the magnet 50 is moved along a switching path defined by the arc of circle traversed by this magnet between its first switching position and its second switching position, respectively corresponding to the first and second stable positions of the switching member.
- Magnet 50 follows the same path in opposite direction as it moves from its second switching position to its first switching position.
- the timepiece 22 comprises a second bipolar magnet 52 which is fixed to the plate 23 so as to present continuously a magnetic interaction with the first bipolar magnet 50 between its first and second switching positions.
- the control rocker 34 comprises a first high magnetic permeability element 54 and is arranged so that, when it is actuated repeatedly by the actuating device, the first element with high magnetic permeability undergoes a back and forth movement between a first control position and a second control position.
- the control rocker is pivoted so that the first element 54 is rotated between a first angular position ( Figure 3 ) and a second angular position ( Figure 4 ) respectively defining the first control position and the second control position.
- the first element 54 is in its second angular position, it is situated substantially between the first and second bipolar magnets, so as to form with these two bipolar magnets a magnetic system of the type previously described in FIGS. Figures 1 and 2 .
- the first element 54 in its second angular position, is located on an alignment axis 56 defined by the magnetic axis of the magnet 52 so that it is substantially between the first and second bipolar magnets; while, in its first angular position, the first element 54 is spaced from the alignment axis 56.
- the switching path of the bipolar magnet 50 is substantially coincident with the alignment axis 56, so that the two bipolar magnets are substantially aligned along this alignment axis for any position of the magnet 50 along the switching path. Then, the magnet 50 is arranged with its magnetic axis substantially oriented along the alignment axis and so that the first and second bipolar magnets 50 and 52 have their polarities opposite.
- Control flip-flop 34 further comprises a second high magnetic permeability element 60 arranged to be substantially aligned with the first and second bipolar magnets 50 and 52 when the first high magnetic permeability element 54 is in its first control position ( Figure 3 ).
- this second element 60 is not essential to the invention.
- the control rocker comprises only one element with high magnetic permeability, namely the element 54.
- the second element 60 is advantageous because it serves in particular to partially channel the flow of the second magnet. 52 along the alignment axis 56 when the control rocker is in its first control position and thus to promote its interaction with the first magnet 50 without the element 54 deviates to a large extent magnetic flux magnets in its transverse direction relative to the alignment axis.
- this element 60 serves to adjust the magnetic repulsion force and in particular to limit this force.
- the second element with high magnetic permeability is arranged to be located closer to one or the other of the first and second bipolar magnets irrespective of the position of the first bipolar magnet along the switching path. , so as to have a magnetic repulsion force on the integer of this switching path.
- the control rocker comprises a positioning device 62 formed by a pin 66 associated with a positioning spring 64.
- This spring has two positioning recesses which respectively define the first and second angular positions of the rocker when the pin is housed successively in these two hollows.
- the control rocker further comprises an opening 68, between its pivot axis 58 and the first high magnetic permeability element 54, in which the second magnet 52 is arranged, this opening having a contour provided so that the control rocker can freely rotate between its first and second angular positions.
- the opening 68 has the shape of an annular sector and the elements 54 and 60 are located opposite this opening relative to the pivot axis, on either side of an axis of symmetry. of the annular opening.
- the actuating device 32 comprises a shuttle 72 guided in translation in a translation direction.
- the shuttle comprises two oblong holes 74 and 75 in which are respectively arranged two rollers 76 and 77 mounted rotating on two shafts fixed to the plate 23.
- this shuttle comprises, at one end facing a rear portion of the rocker, a leaf spring 78 terminated by an actuating head 80 and extending, in its undeformed position (rest position), along a thrust axis 70 parallel to the direction of translation and advantageously intercepting the pivot axis 58 of the control lever.
- the rear part of the rocker is located on a side opposite to the first element 54 relative to the pivot axis 58, this rear part having a symmetrical profile with two actuating recesses 85 and 86 respectively located on the left and right sides. other of an axis of symmetry 88, intercepting the pivot axis 58, and whose respective profiles are provided to receive the head 80.
- the rear portion of the rocker further has a projecting portion 82 which is arranged between the two actuating recesses and which has two symmetrical flanks 83 and 84 respectively leading into the two actuating recesses.
- the axis of symmetry 88 of the aforementioned rear part passes substantially through the top of the projecting portion 82.
- the shuttle 72 and the control rocker 34 are arranged in such a way that when the rocker 34 is in any of its two control positions and the shuttle is pushed towards the rocker by means of a pusher 90, the actuating head 80 comes first abut against one (at the Figure 5A , the flank 84) of the two flanks of the projecting portion facing it (see Figure 5A ) and then slides along this side, elastically deforming the leaf spring 78, until it is housed in the actuating recess at the bottom of the hollow in question (see Figure 5B ).
- the actuating head generates a thrust force F1 which produces a moment of force on the rocker to drive it in rotation at least beyond a median angular position between said first and second angular positions (see Figure 5C ), so as to allow the tilting of the control rocker in the other of its two control positions (see Figure 5D ).
- the actuating device of the control rocker allows the tilting of this control rocker alternately between its first and second stable angular positions corresponding to the two control positions of the control rocker.
- the switching device requires a low thrust force on the pusher so that one can essentially determine the force that a user must apply to change the state of the device. Chronograph mechanism by selecting the return force of the spring associated with the shuttle.
- the clutch device is arranged so that when the first element 54 is in its second control position ( Figure 4 and Figure 6A ), the first and second magnets 50 and 52 generate between them a magnetic attraction force (magnetic force in attraction) on the integer of the switching path of the first magnet, and so that when this first element 54 is in its first command position ( Figure 3 and Figure 6C ), the first and second magnets generate between them a magnetic repulsion force (repulsion magnetic force) over the integer of the switching path.
- a magnetic attraction force magnetic force in attraction
- the magnetic repulsion force is provided with an intensity and a range that are sufficient for it to operate only the switching member 36 between its first stable position and its second stable position, and then that it maintains it in this second stable position; while the magnetic attraction force has an intensity and a range which are sufficient for it to actuate only this switching member between its second stable position and its first stable position, and then it maintains it in this first stable position .
- no return spring associated with the switching member is necessary in this preferred embodiment.
- the Figure 7 still shows an advantage of the switching device according to the invention. It is observed that the torque that must be exerted on the control lever is much lower than the torque exerted on the switching member (clutch lever 38). Thus, a user must provide a lower force on the pusher to trigger the clutch function, respectively the disengagement function, in comparison with a conventional mechanical device.
- the disengaged state and the engaged state are reversed so that the chronograph mechanism is driven when the control member is in one of its two control positions generating a magnetic repulsion force. , while it is stopped when this control member is in the other of its two control positions generating a magnetic attraction force.
- the Figures 6A to 6D are given to show the variation of the magnetic force acting on the magnet 50 integral with the clutch lever 38 as a function of the angular position of the latch order 34.
- the Figure 6A partially shows the clutch device 30 in its engaged state with the control rocker in its stable clutch position.
- the magnetic force FM1 is a magnetic attraction force towards the fixed magnet 52, this force being oriented substantially along the alignment axis 56 and has a relatively high intensity because the moving magnet 50 is located face of the high magnetic permeability element 54 (the longer of the two elements 54 and 60) and at a short distance therefrom, this element 54 also being a short distance from the fixed magnet 52.
- Figure 6B shows the transition to a disengaged state of the clutch device by the tilting of the control rocker clockwise.
- the magnetic force FM2 changes orientation when the rocker 34 is pivoted during this passage and becomes a magnetic repulsion force for the movable magnet 50, respectively for the clutch rocker 38 carrying the magnet.
- the Figure 6C shows the control rocker in its stable disengaging position with the high magnetic permeability element 60 (the shortest of the two elements 54 and 60) substantially aligned with the alignment axis 56. The distance between the element 60 and the movable magnet 50 is relatively large and the magnetic repulsion force FM3 is substantially oriented along the alignment axis.
- the Figure 6D shows the passage of the clutch device from an engaged state to a disengaged state during a pivoting of the rocker 34 counterclockwise.
- the magnetic force FM4 changes orientation again during this passage to become a magnetic attraction force when the movable magnet 50 approaches the element 54.
- a complete cycle of the clutch device according to the invention is completed.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measurement Of Unknown Time Intervals (AREA)
- Electric Clocks (AREA)
Abstract
La pièce d'horlogerie comprend un mécanisme de chronographe avec un dispositif d'embrayage (30) comprenant un organe de commande (34) et un organe de commutation (36) qui peuvent être alternativement commutés entre deux positions stables (état embrayé et état débrayé). Cette pièce d'horlogerie comprend un système magnétique formé d'un premier aimant bipolaire (50) fixé à l'organe de commutation, un deuxième aimant bipolaire (52) fixé au support du dispositif de commutation de manière à présenter continument une interaction magnétique avec le premier aimant bipolaire, et au moins un élément à haute perméabilité magnétique (54) formant l'organe de commande et pouvant subir un mouvement de va-et-vient entre deux positions de commande. Le dispositif de commutation est agencé de manière que, lorsque l'élément à haute perméabilité magnétique est dans sa première position de commande, les deux aimants engendrent entre eux une force de répulsion magnétique et de manière que, lorsque l'élément à haute perméabilité magnétique est dans sa deuxième position de commande, les deux aimants engendrent entre eux une force d'attraction magnétique.The timepiece comprises a chronograph mechanism with a clutch device (30) comprising a control member (34) and a switching member (36) which can alternatively be switched between two stable positions (engaged state and disengaged state ). This timepiece comprises a magnetic system formed of a first bipolar magnet (50) fixed to the switching member, a second bipolar magnet (52) fixed to the support of the switching device so as to present continuously a magnetic interaction with the first bipolar magnet, and at least one high magnetic permeability element (54) forming the control member and being able to move back and forth between two control positions. The switching device is arranged so that, when the high magnetic permeability element is in its first control position, the two magnets generate between them a magnetic repulsion force and so that, when the element with high magnetic permeability is in its second control position, the two magnets generate between them a magnetic attraction force.
Description
La présente invention concerne un dispositif de commutation d'un mécanisme horloger entre deux états fonctionnels.The present invention relates to a switching device of a clock mechanism between two functional states.
De manière générale, la présente invention concerne une pièce d'horlogerie comprenant un mécanisme pouvant commuter entre un premier état et un deuxième état, un dispositif de commutation de ce mécanisme et un dispositif d'actionnement de ce dispositif de commutation. Le dispositif de commutation comprend un organe de commande actionné par le dispositif d'actionnement et un organe de commutation susceptible de passer sur commande d'une première position stable, pour laquelle le mécanisme est dans son premier état, à une deuxième position stable, pour laquelle le mécanisme est dans son deuxième état, et inversement.In general, the present invention relates to a timepiece comprising a mechanism that can switch between a first state and a second state, a switching device of this mechanism and an actuating device of this switching device. The switching device comprises a control member actuated by the actuating device and a switching member that can be placed on command from a first stable position, for which the mechanism is in its first state, to a second stable position, for which mechanism is in its second state, and vice versa.
Plus particulièrement, l'invention concerne un dispositif d'embrayage d'un mécanisme d'un mouvement horloger mécanique.More particularly, the invention relates to a device for clutching a mechanism of a mechanical watch movement.
Divers dispositifs d'embrayage d'un mécanisme de chronographe sont connus de l'homme du métier. La demande de brevet
Le mécanisme d'embrayage classique décrit ci-avant est complexe. Il comprend plusieurs organes pivotés dont une roue à colonnes qui est une pièce complexe et donc relativement onéreuse. Les deux ressorts susmentionnés engendrent des forces de frottement dans les zones de contact mécanique prévues, ce qui engendrent des usures. De plus, de tels ressorts sont fragiles et peuvent avoir une élasticité qui varie en vieillissant. Finalement, les divers organes doivent être précisément montés dans la pièce d'horlogerie pour être fonctionnels, notamment le cliquet d'actionnement de la roue à colonnes et la grande bascule qui engendre le mouvement de va-et-vient du cliquet.The conventional clutch mechanism described above is complex. It comprises several rotated members including a column wheel which is a complex piece and therefore relatively expensive. The two aforementioned springs generate frictional forces in the areas of mechanical contact provided, which generate wear. In addition, such springs are fragile and may have an elasticity that varies with age. Finally, the various members must be precisely mounted in the timepiece to be functional, including the operating ratchet of the column wheel and the large rocker that causes the reciprocating movement of the pawl.
La présente invention a pour but de proposer un dispositif de commutation d'un mécanisme horloger d'un type différent du dispositif classique susmentionné et qui élimine plusieurs inconvénients d'un tel dispositif classique.The object of the present invention is to propose a device for switching a watch mechanism of a type different from the aforementioned conventional device and which eliminates several disadvantages of such a conventional device.
A cet effet, la présente invention concerne une pièce d'horlogerie comprenant un mécanisme pouvant commuter entre un premier état et un deuxième état, un dispositif de commutation de ce mécanisme entre ses premier et deuxième états et un dispositif d'actionnement de ce dispositif de commutation. Le dispositif de commutation comprend un organe de commande actionné par le dispositif d'actionnement et un organe de commutation qui peut passer sur commande d'une première position stable, pour laquelle le mécanisme est dans son premier état, à une deuxième position stable, pour laquelle le mécanisme est dans son deuxième état, et inversement. Cette pièce d'horlogerie comprend :
- un premier aimant bipolaire qui est fixé à l'organe de commutation de manière à subir, lorsque cet organe de commutation passe de sa première position stable à sa deuxième position stable, un mouvement le long d'un chemin de commutation entre une première position de commutation et une deuxième position de commutation, et inversement,
- un deuxième aimant bipolaire qui est fixé au support du dispositif de commutation de manière à présenter continument une interaction magnétique avec le premier aimant bipolaire entre ses première et deuxième positions de commutation,
- au moins un premier élément à haute perméabilité magnétique formant au moins partiellement l'organe de commande.
- a first bipolar magnet which is fixed to the switching member so as to undergo, when the switching member passes from its first stable position to its second stable position, a movement along a switching path between a first position of switching and a second switching position, and vice versa,
- a second bipolar magnet which is fixed to the support of the switching device so as to continually exhibit a magnetic interaction with the first bipolar magnet between its first and second switching positions,
- at least one first element with high magnetic permeability forming at least partially the control member.
L'organe de commande est agencé de manière que, lorsqu'il est actionné de manière répétée par le dispositif d'actionnement, le premier élément à haute perméabilité magnétique subit un mouvement de va-et-vient (mouvement alternatif) entre une première position de commande et une deuxième position de commande. Le dispositif de commutation est agencé de manière que, lorsque le premier élément à haute perméabilité magnétique est dans sa première position de commande, les premier et deuxième aimants engendrent entre eux une force de répulsion magnétique sur sensiblement l'entier du chemin de commutation et de manière que, lorsque le premier élément à haute perméabilité magnétique est dans sa deuxième position de commande, les premier et deuxième aimants engendrent entre eux une force d'attraction magnétique sur au moins une partie du chemin de commutation, cette partie étant située du côté du deuxième aimant bipolaire.The control member is arranged such that, when actuated repeatedly by the actuating device, the first high-magnetic-permeable element is reciprocated (reciprocating) between a first position control and a second control position. The switching device is arranged in such a way that, when the first high magnetic permeability element is in its first control position, the first and second magnets generate between them a magnetic repulsion force over substantially the whole of the switching path and so that when the first element with high magnetic permeability is in its second control position, the first and second magnets generate between them a magnetic attraction force on at least a part of the switching path, this part being located on the side of the second bipolar magnet.
Dans un mode de réalisation spécifique, qui ne sera pas décrit par la suite, un ressort de relativement faible force de rappel est prévu en complément du dispositif de commutation magnétique pour participer au déplacement de l'organe de commutation dans un sens et/ou aider au maintien de cet organe de commutation dans une de ses positions stables. En particulier, lorsque le chemin de commutation est relativement long, un tel ressort peut agir sur l'organe de commutation pour, lorsque le premier élément à haute perméabilité magnétique est dans sa deuxième position de commande, déplacer cet organe de commutation sur une première partie du chemin de commutation située du côté opposé au deuxième aimant bipolaire, jusqu'à ce que la force d'attraction magnétique intervienne pour attirer l'organe de commutation en direction du deuxième aimant bipolaire.In a specific embodiment, which will not be described later, a spring of relatively low return force is provided in addition to the magnetic switching device to participate in the displacement of the switching member in one direction and / or help maintaining this switching member in one of its stable positions. In particular, when the switching path is relatively long, such a spring can act on the switching member for, when the first element with high magnetic permeability is in its second control position, move this switching member on a first part the switching path located on the side opposite the second bipolar magnet, until the magnetic attraction force intervenes to attract the switching member towards the second bipolar magnet.
Dans un mode de réalisation préféré, la force magnétique de répulsion a une intensité et une portée qui sont suffisantes pour qu'elle puisse actionner seule l'organe de commutation entre sa première position stable et sa deuxième position stable et ensuite le maintenir dans cette deuxième position stable ; alors que la force magnétique d'attraction a une intensité et une portée qui sont suffisantes pour qu'elle puisse actionner seule l'organe de commutation entre sa deuxième position stable et sa première position stable et ensuite le maintenir dans cette première position stable.In a preferred embodiment, the repulsive magnetic force has an intensity and a range that are sufficient for it to operate alone the switching member between its first stable position and its second stable position and then maintain it in this second position. stable position; while the magnetic attraction force has an intensity and a range that are sufficient for it to operate alone the switching member between its second stable position and its first stable position and then maintain it in this first stable position.
Grâce au système magnétique de l'invention et notamment à l'organe de commande qui comprend au moins un élément à haute perméabilité magnétique mobile entre deux positions de commande susmentionnées, le dispositif de commutation magnétique définit un système bistable. De plus, dans le mode de réalisation préféré, mentionné ci-avant, ce dispositif de commutation ne nécessite aucun ressort de rappel associé à l'organe de commutation.Thanks to the magnetic system of the invention and in particular to the control member which comprises at least one high magnetic permeability element movable between two aforementioned control positions, the magnetic switching device defines a bistable system. Moreover, in the preferred embodiment, mentioned above, this device for switching does not require any return spring associated with the switching member.
Dans une variante de réalisation préférée, l'organe de commande est formé par une bascule pivotée de manière que l'élément à haute perméabilité magnétique subit un mouvement de rotation entre deux positions angulaires déterminées lorsque cette bascule de commande est actionnée. Une telle bascule constitue une pièce plus simple à réaliser qu'une roue à colonnes. En particulier, la bascule de commande est pivotée de manière que le premier élément à haute perméabilité magnétique subit une rotation entre une première position angulaire et une deuxième position angulaire définissant respectivement la première position de commande et la deuxième position de commande. Ensuite, lorsque le premier élément à haute perméabilité magnétique est dans sa deuxième position angulaire, ce premier élément est sensiblement situé sur un axe d'alignement défini par l'axe magnétique du deuxième aimant bipolaire de manière qu'il se trouve sensiblement entre les premier et deuxième aimants bipolaires. Par contre, dans sa première position angulaire, le premier élément à haute perméabilité magnétique est écarté de l'axe d'alignement susmentionné.In a preferred embodiment, the control member is formed by a rocker pivoted so that the high magnetic permeability element undergoes a rotational movement between two determined angular positions when the control rocker is actuated. Such a rocker is a simpler piece to achieve a column wheel. In particular, the control rocker is pivoted so that the first high magnetic permeability element is rotated between a first angular position and a second angular position respectively defining the first control position and the second control position. Then, when the first element with high magnetic permeability is in its second angular position, this first element is substantially located on an alignment axis defined by the magnetic axis of the second bipolar magnet so that it is substantially between the first and second and second bipolar magnets. By cons, in its first angular position, the first element with high magnetic permeability is spaced from the aforementioned alignment axis.
On remarquera que l'actionnement de la bascule de commande ne nécessite pas de cliquet pivoté et associé à un ressort de rappel. On notera encore que le système magnétique permet d'éviter tout contact entre l'organe de commande et l'organe de commutation.Note that the actuation of the control lever does not require a pawl pivoted and associated with a return spring. It will also be noted that the magnetic system makes it possible to avoid any contact between the control member and the switching member.
Dans une variante avantageuse, le chemin de commutation du premier aimant bipolaire est sensiblement confondu avec l'axe d'alignement défini par l'axe magnétique du deuxième aimant bipolaire et ce premier aimant bipolaire est agencé avec son axe magnétique sensiblement orienté selon cet axe d'alignement, les premier et deuxième aimants bipolaires étant agencés avec leurs polarités opposées.In an advantageous variant, the switching path of the first bipolar magnet is substantially coincident with the alignment axis defined by the magnetic axis of the second bipolar magnet and this first bipolar magnet is arranged with its magnetic axis substantially oriented along this axis. alignment, the first and second bipolar magnets being arranged with their polarities opposite.
L'invention sera décrite ci-après de manière détaillée à l'aide de dessins annexés, donnés à titre d'exemples nullement limitatifs, dans lesquels :
- La
Figure 1 montre schématiquement un système magnétique dont le fonctionnement particulier est mis à profit dans la présente invention; - La
Figure 2 représente un graphe de la force magnétique subie par un aimant mobile du système magnétique de laFigure 1 en fonction de sa distance d'éloignement d'un élément à haute perméabilité magnétique formant une partie de ce système magnétique; - Les
Figures 3 et4 sont des vues en plan d'un mode de réalisation de l'invention dans lequel un mécanisme chronographe est commuté par un dispositif d'embrayage entre un état embrayé et un état débrayé; - Les
Figures 5A à 5D représentent diverses phases successives d'un actionnement d'une bascule de commande entre ses deux positions angulaires de commande; - Les
Figures 6A à 6D représentent schématiquement le système magnétique de l'invention dans quatre situations particulières avec les forces magnétiques respectives qui sont exercées sur un aimant porté par une bascule d'embrayage; et - La
Figure 7 donnent quatre courbes de couple en fonction de la position angulaire de la bascule de commande, ces courbes montrant les couples subis respectivement par cette bascule de commande et la bascule d'embrayage lorsque cette dernière est soit dans sa position embrayée, soit dans sa position débrayée.
- The
Figure 1 shows schematically a magnetic system whose particular operation is used in the present invention; - The
Figure 2 represents a graph of the magnetic force experienced by a moving magnet of the magnetic system of theFigure 1 according to its distance away from a high magnetic permeability element forming part of this magnetic system; - The
Figures 3 and4 are plan views of an embodiment of the invention in which a chronograph mechanism is switched by a clutch device between an engaged state and a disengaged state; - The
Figures 5A to 5D represent various successive phases of an actuation of a control rocker between its two angular control positions; - The
Figures 6A to 6D schematically represent the magnetic system of the invention in four particular situations with the respective magnetic forces which are exerted on a magnet carried by a clutch rocker; and - The
Figure 7 give four torque curves as a function of the angular position of the control rocker, these curves showing the torques experienced respectively by this control rocker and the clutch rocker when the latter is either in its engaged position or in its disengaged position .
On commencera par décrire à l'aide des
Le système magnétique 2 comprend un premier aimant fixe 4, un élément à haute perméabilité magnétique 6 et un deuxième aimant 8 qui est mobile, selon un axe de déplacement confondu ici à l'axe d'alignement 10 de ces trois éléments magnétiques, relativement à l'ensemble formé par le premier aimant 4 et l'élément 6. Cet élément 6 est agencé entre le premier aimant et le deuxième aimant, proche du premier aimant et dans une position déterminée relativement à celui-ci. Dans une variante particulière, la distance entre l'élément 6 et l'aimant 4 est inférieure ou sensiblement égale à un dixième de la longueur de cet aimant selon son axe d'aimantation. L'élément 6 est constitué par exemples d'un acier au carbone, de carbure tungstène, de nickel, de FeSi ou FeNi, ou d'autres alliages avec du cobalt comme le Vacozet ® (CoFeNi) ou le Vacoflux ® (CoFe). Dans une variante avantageuse, cet élément à haute perméabilité magnétique est constitué d'un verre métallique à base de fer ou cobalt. L'élément 6 est caractérisé par un champ de saturation Bs et une perméabilité µ. Les aimants 4 et 8 sont par exemples en ferrite, en FeCo ou PtCo, en terres rares comme NdFeB ou SmCo. Ces aimants sont caractérisés par leur champ rémanent Br1 et Br2.The
L'élément à haute perméabilité magnétique 6 présente un axe central qui est de préférence sensiblement confondu avec l'axe d'aimantation du premier aimant 4 et également avec l'axe d'aimantation du deuxième aimant 8, cet axe central étant ici confondu avec l'axe d'alignement 10. Les sens d'aimantation respectifs des aimants 4 et 8 sont opposés. Ces premier et deuxième aimants ont donc des polarités opposées et ils sont susceptibles de subir entre eux un mouvement relatif sur une certaine distance relative. La distance D entre l'élément 6 et l'aimant mobile 8 est indiquée aux
Les deux aimants 4 et 8 sont agencés en répulsion magnétique de sorte que, en l'absence de l'élément à haute perméabilité magnétique 6, une force de répulsion magnétique tend à éloigner ces deux aimants l'un de l'autre. Cependant, de manière surprenante, l'agencement entre ces deux aimants de l'élément 6 inverse le sens de la force magnétique exercée sur l'aimant mobile lorsque la distance entre cet aimant mobile et l'élément 6 est suffisamment petite, de sorte que l'aimant mobile subit alors une force d'attraction magnétique. La courbe 12 de la
La force magnétique exercée sur l'aimant mobile est une fonction continue de la distance D et elle a donc une valeur nulle à la distance Dinv pour laquelle il y a inversion de cette force magnétique. Ceci est un fonctionnement remarquable du système magnétique 2 qui est implémenté dans le dispositif de commutation selon l'invention. La distance d'inversion Dinv est déterminée par la géométrie des trois pièces magnétiques formant le système magnétique et par leurs propriétés magnétiques. Cette distance d'inversion peut donc être sélectionnée, dans une certaine mesure, par les paramètres physiques des trois éléments magnétiques du système magnétique 2 et par la distance séparant l'aimant fixe de l'élément ferromagnétique. Il en va de même pour l'évolution de la pente de la courbe 12, la variation de cette pente et en particulier l'intensité de la force d'attraction lorsque l'aimant mobile se rapproche de l'élément ferromagnétique pouvant ainsi être ajustées.The magnetic force exerted on the moving magnet is a continuous function of the distance D and it therefore has a value of zero at the distance D inv for which this magnetic force is inverted. This is a remarkable operation of the
En référence aux
Le mouvement horloger 22 comprend un mécanisme chronographe 24 représenté partiellement par la roue de chronographe 26. De manière classique, ce mécanisme de chronographe peut commuter entre un premier état débrayé, c'est-à-dire à l'arrêt, et un deuxième état embrayé dans lequel la roue de chronographe 26 est couplée cinématiquement à la roue entraîneuse 28 du mouvement horloger. A cet effet, il est prévu un dispositif de commutation du mécanisme de chronographe, formant un dispositif d'embrayage 30 de ce mécanisme, et un dispositif d'actionnement 32 de ce dispositif d'embrayage. Le dispositif d'embrayage 30 comprend un organe de commande, formé par une bascule de commande 34 actionnée par le dispositif d'actionnement, et un organe de commutation 36 qui comprend une bascule d'embrayage 38 montée sur une platine 23, un pont de bascule 40 et une roue d'embrayage 42 pivotée entre cette bascule et ce pont. L'organe de commutation 36 est susceptible de passer sur commande d'une première position stable (
A cet effet, un premier aimant bipolaire 50 est fixé à une première extrémité de la bascule 38 qui est pivotée autour d'un axe 46 à sa deuxième extrémité. Lorsque cet organe de commutation passe de sa première position stable à sa deuxième position stable, l'aimant 50 subit un mouvement le long d'un chemin de commutation défini par l'arc de cercle parcouru par cet aimant entre sa première position de commutation et sa deuxième position de commutation, correspondant respectivement aux première et deuxième positions stables de l'organe de commutation. L'aimant 50 suit le même chemin en sens inverse lorsqu'il passe de sa deuxième position de commutation et sa première position de commutation.For this purpose, a first
Ensuite, la pièce d'horlogerie 22 comprend un deuxième aimant bipolaire 52 qui est fixé à la platine 23 de manière à présenter continument une interaction magnétique avec le premier aimant bipolaire 50 entre ses première et deuxième positions de commutation.Next, the
Selon l'invention, la bascule de commande 34 comprend un premier élément à haute perméabilité magnétique 54 et elle est agencée de manière que, lorsqu'elle est actionnée de manière répétée par le dispositif d'actionnement, le premier élément à haute perméabilité magnétique subit un mouvement de va-et-vient entre une première position de commande et une deuxième position de commande. La bascule de commande est pivotée de manière que le premier élément 54 subit une rotation entre une première position angulaire (
De préférence, dans sa deuxième position angulaire, le premier élément 54 est situé sur un axe d'alignement 56 défini par l'axe magnétique de l'aimant 52 de manière qu'il se trouve sensiblement entre les premier et deuxième aimants bipolaires ; alors que, dans sa première position angulaire, le premier élément 54 est écarté de l'axe d'alignement 56. De préférence, comme c'est le cas dans le mode de réalisation décrit, le chemin de commutation de l'aimant bipolaire 50 est sensiblement confondu avec l'axe d'alignement 56, de sorte que les deux aimants bipolaires sont sensiblement alignés selon cet axe d'alignement pour toute position de l'aimant 50 le long du chemin de commutation. Ensuite, l'aimant 50 est agencé avec son axe magnétique sensiblement orienté selon l'axe d'alignement et de manière que les premier et deuxième aimants bipolaires 50 et 52 aient leurs polarités opposées.Preferably, in its second angular position, the
Dans la variante avantageuse décrite à l'aide des Figures, voir en particulier les
La bascule de commande 34 comprend en outre un deuxième élément à haute perméabilité magnétique 60 agencé de manière à être sensiblement aligné avec les premier et deuxième aimants bipolaires 50 et 52 lorsque le premier élément à haute perméabilité magnétique 54 est dans sa première position de commande (
La bascule de commande comprend un dispositif de positionnement 62 formé par une goupille 66 associée à un ressort de positionnement 64. Ce ressort présente deux creux de positionnement qui définissent respectivement les première et deuxième positions angulaires de la bascule lorsque la goupille est logée successivement dans ces deux creux. La bascule de commande comprend en outre une ouverture 68, entre son axe de pivotement 58 et le premier élément à haute perméabilité magnétique 54, dans laquelle est agencé le deuxième aimant 52, cette ouverture ayant un contour prévu de manière que la bascule de commande peut subir librement une rotation entre ses première et deuxième positions angulaires. Dans la variante représentée, l'ouverture 68 présente la forme d'un secteur annulaire et les éléments 54 et 60 sont situés en regard de cette ouverture relativement à l'axe de pivotement, de part et d'autre d'un axe de symétrie de l'ouverture annulaire.The control rocker comprises a
Le dispositif d'actionnement 32 comprend une navette 72 guidée en translation selon une direction de translation. A cet effet, la navette comprend deux trous oblongs 74 et 75 dans lesquels sont agencés respectivement deux galets 76 et 77 montés tournant sur deux arbres fixés à la platine 23. Pour actionner alternativement la bascule 34 dans les deux sens de rotation entre ses deux positions angulaires stables, cette navette comprend, à une extrémité orientée vers une partie arrière de la bascule, un ressort-lame 78 terminé par une tête d'actionnement 80 et s'étendant, dans sa position non déformée (position de repos), le long d'un axe de poussée 70 parallèle à la direction de translation et interceptant avantageusement l'axe de pivotement 58 de la bascule de commande. Ensuite, la partie arrière de la bascule est située d'un côté opposé au premier élément 54 relativement à l'axe de pivotement 58, cette partie arrière présentant un profil symétrique avec deux creux d'actionnement 85 et 86 respectivement situés de part et d'autre d'un axe de symétrie 88, interceptant l'axe de pivotement 58, et dont les profils respectifs sont prévus pour recevoir la tête d'actionnement 80. La partie arrière de la bascule présente en outre une partie saillante 82 qui est agencée entre les deux creux d'actionnement et qui présente deux flancs symétriques 83 et 84 aboutissant respectivement dans les deux creux d'actionnement. L'axe de symétrie 88 de la partie arrière susmentionnée passe sensiblement par le sommet de la partie saillante 82.The
De manière remarquable, comme représenté aux
On remarquera qu'il est prévu un ressort 92 qui exerce une force de rappel sur la navette 72. Ce ressort peut être remplacé par un ressort incorporé dans un bouton-poussoir associé au poussoir 90 si ce dernier est solidaire en translation du bouton-poussoir. Comme on le verra par la suite, le dispositif de commutation selon l'invention requière qu'une faible force de poussée sur le poussoir de sorte que l'on peut essentiellement déterminer la force qu'un utilisateur doit appliquer pour changer l'état du mécanisme de chronographe en sélectionnant la force de rappel du ressort associé à la navette.Note that there is a
Voici quelques observations en relation avec le mode de réalisation préféré représenté aux figures : - Le fait que la goupille 66 est située sur l'axe de symétrie 88 constitue seulement une variante symétrique avantageuse pour le dispositif de positionnement 62 ; - Le fait que la lame-ressort 78 soit agencée au repos (dans son état non déformé) sur l'axe de poussée 70 de la navette représente une variante avantageuse mais non obligatoire (en effet, un certain angle entre eux est envisageable) ; - Le fait que l'axe de poussée, sur lequel est situé la lame-ressort au repos, intercepte l'axe de pivotement 58 et que l'axe de symétrie 88 présente un décalage angulaire identique (en valeur absolue) avec cet axe de poussée dans les deux positions de commande de la bascule constitue une variante préférée ; - le fait que l'axe d'alignement 56 soit parallèle à la direction de translation de la navette est un cas particulier non obligatoire ; - et le fait que l'axe de poussée 70 soit confondu avec l'axe d'alignement 56 définit un cas avantageux mais non obligatoire.Here are some observations in connection with the preferred embodiment shown in the figures: - The fact that the
En se référant plus particulièrement aux
Quelle que soit la position de l'organe de commutation, on voit que le couple produit par la force magnétique engendrée par le système magnétique, composé des deux aimants 50 et 52 et des deux éléments à haute perméabilité magnétiques 54 et 60, passe d'un couple négatif correspondant à une force d'attraction magnétique lorsque la bascule de commande occupe la position angulaire 0° à un couple positif correspondant à une force de répulsion magnétique lorsque cette bascule occupe la position angulaire 20°. Ainsi, pour la position angulaire 0° de la bascule de commande, la plage de couple TR1 s'exerçant sur l'organe d'embrayage est entièrement négative, alors que pour la position angulaire 20° de cette bascule, la plage de couple TR2 s'exerçant sur l'organe d'embrayage est entièrement positive. En conclusion, comme le révèle les courbes de couple de la
De plus, la force de répulsion magnétique est prévue avec une intensité et une portée qui sont suffisantes pour qu'elle actionne seule l'organe de commutation 36 entre sa première position stable et sa deuxième position stable, et ensuite qu'elle le maintienne dans cette deuxième position stable ; alors que la force d'attraction magnétique a une intensité et une portée qui sont suffisantes pour qu'elle actionne seule cet organe de commutation entre sa deuxième position stable et sa première position stable, et ensuite qu'elle le maintienne dans cette première position stable. Ainsi, aucun ressort de rappel associé à l'organe de commutation n'est nécessaire dans ce mode de réalisation préféré.In addition, the magnetic repulsion force is provided with an intensity and a range that are sufficient for it to operate only the switching
La
On remarquera que, dans une autre variante, l'état débrayé et l'état embrayé sont inversés de sorte que le mécanisme de chronographe est entrainé lorsque l'organe de commande est dans une de ses deux positions de commande engendrant une force de répulsion magnétique, alors qu'il est à l'arrêt lorsque cet organe de commande est dans l'autre de ses deux positions de commande engendrant une force d'attraction magnétique.It will be noted that, in another variant, the disengaged state and the engaged state are reversed so that the chronograph mechanism is driven when the control member is in one of its two control positions generating a magnetic repulsion force. , while it is stopped when this control member is in the other of its two control positions generating a magnetic attraction force.
Les
Claims (11)
cette pièce d'horlogerie étant caractérisée en ce qu'elle comprend :
this timepiece being characterized in that it comprises:
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP16201163.9A EP3327518B1 (en) | 2016-11-29 | 2016-11-29 | Timepiece comprising a switching device of a clockwork mechanism |
US15/812,264 US10468215B2 (en) | 2016-11-29 | 2017-11-14 | Timepiece comprising a device for switching a timepiece mechanism |
JP2017224481A JP6442589B2 (en) | 2016-11-29 | 2017-11-22 | Timer having device for switching mechanism for timer |
CN201711214619.2A CN108121189B (en) | 2016-11-29 | 2017-11-28 | Timepiece comprising a device for switching a clockwork mechanism |
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EP16201163.9A EP3327518B1 (en) | 2016-11-29 | 2016-11-29 | Timepiece comprising a switching device of a clockwork mechanism |
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EP3327518A1 true EP3327518A1 (en) | 2018-05-30 |
EP3327518B1 EP3327518B1 (en) | 2020-03-18 |
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Application Number | Title | Priority Date | Filing Date |
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EP16201163.9A Active EP3327518B1 (en) | 2016-11-29 | 2016-11-29 | Timepiece comprising a switching device of a clockwork mechanism |
Country Status (4)
Country | Link |
---|---|
US (1) | US10468215B2 (en) |
EP (1) | EP3327518B1 (en) |
JP (1) | JP6442589B2 (en) |
CN (1) | CN108121189B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2023823B1 (en) * | 2019-09-12 | 2021-05-17 | Flexous Mech Ip B V | Watch |
NL2023822B1 (en) * | 2019-09-12 | 2021-05-17 | Flexous Mech Ip B V | Chronograph watch |
WO2023248177A1 (en) | 2022-06-23 | 2023-12-28 | Lvmh Swiss Manufactures Sa | Bistable timepiece control mechanism |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3101007B1 (en) * | 2019-09-19 | 2021-09-03 | Sidel Participations | Magnetic bistable molding unit |
WO2023248178A1 (en) * | 2022-06-23 | 2023-12-28 | Lvmh Swiss Manufactures Sa | Bistable timepiece control mechanism |
EP4379477A1 (en) | 2022-11-30 | 2024-06-05 | Flexous Mechanisms IP B.V. | Movement, such as a chronograph movement, for a watch |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4409576A (en) * | 1982-02-03 | 1983-10-11 | Polaroid Corporation | Method and apparatus which change magnetic forces of a linear motor |
EP2897003A2 (en) | 2014-01-16 | 2015-07-22 | Richemont International S.A. | Movement and mechanical timepiece including a chronograph mechanism |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4815094Y1 (en) * | 1969-02-03 | 1973-04-25 | ||
JPS4910859Y1 (en) * | 1969-11-28 | 1974-03-15 | ||
GB1271626A (en) * | 1969-12-08 | 1972-04-19 | Seiko Instr & Electronics | Electric timepiece |
JPS5761590U (en) * | 1980-09-17 | 1982-04-12 | ||
US7015782B2 (en) * | 2003-02-19 | 2006-03-21 | Sensys Medical, Inc. | Magneto-mechanical apparatus |
US9715217B2 (en) * | 2013-12-23 | 2017-07-25 | The Swatch Group Research And Development Ltd | Device intended to control the angular speed of a train in a timepiece movement and including a magnetic escapement |
EP3070543A1 (en) * | 2015-03-18 | 2016-09-21 | Glashütter Uhrenbetrieb GmbH | Repetition striking mechanism with integrated trigger lock |
EP3185080B1 (en) * | 2015-12-22 | 2019-12-18 | Montres Breguet S.A. | Timepiece mechanism comprising a pivoting member provided with magnetic return means |
EP3264199A1 (en) * | 2016-07-01 | 2018-01-03 | Montres Breguet S.A. | Timepiece comprising a switching device of a clockwork mechanism |
-
2016
- 2016-11-29 EP EP16201163.9A patent/EP3327518B1/en active Active
-
2017
- 2017-11-14 US US15/812,264 patent/US10468215B2/en active Active
- 2017-11-22 JP JP2017224481A patent/JP6442589B2/en active Active
- 2017-11-28 CN CN201711214619.2A patent/CN108121189B/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4409576A (en) * | 1982-02-03 | 1983-10-11 | Polaroid Corporation | Method and apparatus which change magnetic forces of a linear motor |
EP2897003A2 (en) | 2014-01-16 | 2015-07-22 | Richemont International S.A. | Movement and mechanical timepiece including a chronograph mechanism |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2023823B1 (en) * | 2019-09-12 | 2021-05-17 | Flexous Mech Ip B V | Watch |
NL2023822B1 (en) * | 2019-09-12 | 2021-05-17 | Flexous Mech Ip B V | Chronograph watch |
WO2023248177A1 (en) | 2022-06-23 | 2023-12-28 | Lvmh Swiss Manufactures Sa | Bistable timepiece control mechanism |
Also Published As
Publication number | Publication date |
---|---|
US10468215B2 (en) | 2019-11-05 |
CN108121189B (en) | 2020-03-27 |
EP3327518B1 (en) | 2020-03-18 |
JP2018087813A (en) | 2018-06-07 |
CN108121189A (en) | 2018-06-05 |
JP6442589B2 (en) | 2018-12-19 |
US20180151317A1 (en) | 2018-05-31 |
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