EP3671370A1 - Kupplungsvorrichtung und chronographenmechanismus, der eine solche kupplungsvorrichtung umfasst - Google Patents

Kupplungsvorrichtung und chronographenmechanismus, der eine solche kupplungsvorrichtung umfasst Download PDF

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Publication number
EP3671370A1
EP3671370A1 EP18214687.8A EP18214687A EP3671370A1 EP 3671370 A1 EP3671370 A1 EP 3671370A1 EP 18214687 A EP18214687 A EP 18214687A EP 3671370 A1 EP3671370 A1 EP 3671370A1
Authority
EP
European Patent Office
Prior art keywords
wheel
clutch
chronograph
moving parts
clutch device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18214687.8A
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English (en)
French (fr)
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EP3671370B1 (de
Inventor
Anthony Krüttli
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.)
Patek Philippe SA Geneve
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Patek Philippe SA Geneve
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP18214687.8A priority Critical patent/EP3671370B1/de
Publication of EP3671370A1 publication Critical patent/EP3671370A1/de
Application granted granted Critical
Publication of EP3671370B1 publication Critical patent/EP3671370B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G04F7/0823—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement
    • G04F7/0828—Watches or clocks with stop devices, e.g. chronograph with couplings between the chronograph mechanism and the base movement acting in the plane of the 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
    • 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
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with spring action

Definitions

  • the present invention relates to a friction clutch device comprising a clutch control member and a clutch spring capable of frictionally coupling a first wheel to a second wheel so that they can pivot together along an axis A, l one of the first and second wheels being a driving wheel and the other being a driven wheel, said wheels being intended for a timepiece.
  • the present invention also relates to a chronograph mechanism comprising such a clutch device.
  • the movement of the seconds wheel in the basic movement is transmitted to the chronograph wheel carrying the second hand of the chronograph via a clutch device arranged to couple the seconds wheel to the chronograph wheel and allow the latter to be driven as well as to separate the two wheels and stop the chronograph mechanism.
  • the main drawback encountered with the horizontal clutch and the oscillating clutch consists in that, during the clutch, that is to say when the intermediate wheel or the oscillating pinion meshes with the chronograph wheel, the penetration the teeth of the intermediate wheel or of the oscillating pinion in that of the chronograph wheel can cause an untimely jump of the chronograph wheel and therefore of the chronograph hand, causing a shift in the information.
  • the clutch device further comprises a friction spring connecting the clutch disc and the clutch spring to the chronograph shaft, in particular to allow the reset of the chronograph hand.
  • This friction spring is sensitive and delicate to size correctly to guarantee its effectiveness in this complex construction.
  • this clutch device occupies a large space both in height and in width, due to the isolation wheel and its insulator.
  • the present invention seeks to remedy these drawbacks by proposing a clutch device making it possible to engage the chronograph without shifting the information during clutching, and in particular without inadvertent jumping of the chronograph hand.
  • the present invention also aims to propose a clutch device that takes up little space and allows easy triggering of the chronograph.
  • the present invention relates to a friction clutch device comprising a clutch control member and a clutch spring capable of frictionally coupling a first wheel to a second wheel so that they can pivot together according to a axis A, one of the first and second wheels being a driving wheel and the other being a driven wheel intended for a timepiece.
  • the clutch spring comprises a hub mounted to rotate freely along the axis A and a set of moving parts connected respectively to the hub by elastic elements, each of said moving parts comprising a clutch element intended for s '' press the second wheel and being pivotally mounted in a radial plane perpendicular to the axis A on the first wheel to be able to switch between a engaged position in which its clutch element is kept pressed on the second wheel under the effect of its elastic element, and a disengaged position in which its clutch element is not in contact with the second wheel, each of said moving parts being arranged so that all of said moving parts define substantially the periphery of said clutch spring.
  • the clutch control member comprises a radial support element arranged to come to bear radially on at least one of the moving parts of the clutch spring to tilt said moving part from its engaged position to its disengaged position. , causing the rotation of the hub in turn causing the tilting of the other moving parts in their disengaged position, in order to decouple the second wheel from the first wheel.
  • the clutch device makes it possible to produce a horizontal friction clutch, and therefore without shifting the information during clutching, and of small size and easy to trigger.
  • the present invention also relates to a chronograph mechanism comprising such a clutch device, in which one of the first and second wheels is the driving wheel which is integral with a driving shaft of a cog in a watch movement and the another of the first and second wheels is the driven wheel which is integral with a chronograph shaft carrying a chronograph display member, the motor shaft and the chronograph shaft being pivotally mounted about the axis A.
  • the present invention also relates to a chronograph comprising such a chronograph mechanism.
  • the present invention also relates to a timepiece comprising a clutch device as defined above.
  • a clutch device 1 comprises a clutch control member 2 and a clutch spring 3 capable of frictionally coupling a first wheel 4 to a second wheel 5 so that they can pivot together along an axis A.
  • the clutch device 1 is implemented in an autonomous chronograph mechanism having its own timepiece movement with its own oscillating regulator or in a chronograph mechanism linked to a basic movement but including a mechanism to stop the motor shaft linked to the chronograph when it is not in operation.
  • the first wheel 4 is a driving wheel, integral with a motor shaft 6 of the autonomous chronograph movement or kinematically linked to the basic movement, mounted pivoting about the axis A in bearings 7.
  • the motor shaft 6 is for example the shaft of the second mobile or a shaft kinematically linked to the second mobile but which can be locked in rotation independently when the chronograph is not used.
  • the first wheel 4 thus constitutes the chronograph driving wheel.
  • the second wheel 5 is a driven wheel, here integral with a chronograph shaft 8 carrying a chronograph display member, such as a chronograph hand (not shown).
  • the second wheel 5 thus constitutes the chronograph wheel.
  • the chronograph shaft 8 is pivotally mounted around the axis A.
  • it comprises a base 8a fixed integrally to the second wheel 5, which is mounted pivoting around the upper bearing 7 of the motor shaft 6.
  • the second wheel 5 could be fixedly attached to the base of the chronograph shaft, said base being pivotally mounted around the upper bearing 7 of the motor shaft 6.
  • the chronograph shaft 8 carries a heart 9 on which a hammer (not shown) is pressed for resetting the chronograph hand to zero.
  • the clutch spring 3 comprises a hub 10 mounted to rotate freely along the axis A around the drive shaft 6 and a set of movable parts 12 connected respectively to the hub 10 by elastic elements 14, each of said moving parts 12 comprising a clutch element 16 intended to bear on the second wheel 5, and being pivotally mounted in a radial plane perpendicular to the axis A on the first wheel 4 in order to be able to switch between a engaged position in which its clutch element 16 is kept pressed on the second wheel 5 under the effect of its elastic element 14, and a disengaged position in which its clutch element 16 is not in contact with the second wheel 5, each of said moving parts 12 being arranged so that all of said moving parts 12 generally define the periphery of the clutch spring 3 substantially.
  • each moving part 12 comprises a middle part 12a, a first arm 12b in the form of an arc of a circle defining a portion of the periphery of the clutch spring 8, said first arm 12b being integral with one end of the middle part 12a, and a second arm 12c pivotally mounted on the first wheel 4, integral with the other end of the middle part 12a, said second arm 12c carrying the clutch element 16 (cf. Figures 1 and 2 ) and being connected to the hub 10 by the elastic element 14.
  • the first arm 12b is tapered on the side of its free end and its length corresponds substantially to the perimeter of the clutch spring 3 divided by the number of moving parts 12 minus the necessary clearances provided on each side of the first arms 12b to allow tilting of the moving parts 12 in the disengaged position.
  • the moving parts 12 are arranged concentrically around the hub 10, nested one inside the other so that the set of first arms 12b in the form of an arc of a circle makes it possible to reconstitute a circle generally defining the periphery of the clutch spring 3 , each of the first arms 12b constituting a lever on which the control member 2 will be able to press to control the clutch device as will be described below.
  • the curvature of the arc of a circle of each first arm 12b is chosen so that the first arms 12b have as axis of construction the axis A when the moving parts 12 tilt so as to preserve the circular shape of the periphery of the clutch spring regardless of the position of the moving parts 12.
  • the number of moving parts 12 is here six, but a different number of moving parts 12 can be provided.
  • the middle part 12a as well as the first arm 12b and the second arm 12c are configured so that, when the moving parts 12 are in the engaged position, not stressed by the control member 2, the middle part 12a of said moving part 12 is substantially concentric with the first arm 12b of the preceding moving part 12 (by ordering the moving parts 12 clockwise) and on the second arm 12c of the following moving part 12, the games necessary to allow tilting moving parts 12 in the disengaged position and their mutual positioning being provided between each moving part 12. Games are also provided for the manufacture of moving parts produced in a single piece, these games also depending on the tools used to machine the moving parts.
  • the second arm 12c of a moving part 12 integrates substantially into the space formed under the middle part 12a of the preceding moving part 12
  • the middle part 12a of said moving part 12 integrates substantially into the space formed under the first arm 12b of the preceding moving part 12
  • the second arm 12c of said moving part 12 covers the middle part 12a of the following moving part 12.
  • Each moving part 12 is mounted on the first wheel 4 by means of a pivoting system.
  • the pivoting system comprises a pivoting pin 20 (cf. Figure 1 ) mounted on the first wheel 4 and arranged to constitute the pivot axis of the moving part 12 on said first wheel 4, as will be described below.
  • the second arm 12c of the moving part 12 comprises, on the side of its end linked to the central part 12a, a first orifice 18, passing through, and intended to receive said pivot pin 20.
  • the system of pivoting can comprise a flexible pivot on the one hand connected to the moving part 12 and on the other hand fixed to the first wheel 4 by a fixing element driven into said first wheel 4.
  • the second arm 12c of the moving part 12 also comprises, on the side of its end linked to the middle part 12a, the elastic element 14 connecting said moving part 12 to the hub 10.
  • the elastic element 14 is for example a blade elastic positioned on the edge, advantageously having at least one bend at the connection with the second arm 12c and at the connection with the hub 10.
  • the elastic blade could be straight, without elbow, substantially collinear to the right passing through the center of rotation of the hub 10 and the center of rotation of the moving part 12.
  • the hub 10 preferably has a generally polygonal shape, the number of sides of the hub 10 corresponding to the number of moving parts 12.
  • Each elastic element 14 is linked to a vertex of the polygonal hub 10.
  • the second arm 12c of the moving part 12 has a second orifice 22 intended to receive the clutch element 16 of the moving part 12.
  • the clutch element 16 is therefore positioned on the second arm 12c of the moving part 12 on the side opposite to the first arm 12b relative to the pivot axis of said moving part 12 defined by the pivoting pin 20.
  • This clutch element 16 is a stud secured to its movable part 12 extending coaxially to the axis A, and projecting in the direction of the second wheel 5 and the chronograph shaft 8, the sides of the stud being arranged in order to be able to bear on said second wheel 5.
  • the stud can be attached or formed in one piece with the moving part 12.
  • the stud preferably has a cylindrical shape but can also be of planar, concave or convex shape.
  • the clutch elements 16 are positioned on the second arm 12c so that, when the clutch spring 3 is not mounted, the circle tangentially inscribed in the clutch elements 16 has a diameter less than the diameter of the second wheel 5.
  • each moving part 12 will tilt when the clutch elements 16 are in contact with the outer peripheral wall 5a of the second wheel 5 in order to be able to insert said second wheel 5 between said clutch elements 16, which will have the effect of deforming the elastic elements 14 and therefore of constraining the system.
  • Each elastic element 14 is then pre-armed in order to be able to maintain the clutch element 16 on the second wheel 5 in the engaged position.
  • the second arm 12c is configured so that, in the engaged position, the clutch element 16 can bear on the outer peripheral wall 5a (cf. Figure 1 ) of the second wheel 5. It is obvious that the second arm 12c can be configured so that, in the engaged position, the clutch element 16 can bear on an inner peripheral wall provided on the second wheel 5.
  • the clutch spring 3 can be made of metallic material such as steel, or any other suitable material, such as silicon, ceramic, metallic glass, according to the appropriate techniques known to those skilled in the art. It can advantageously be made in one piece.
  • the first wheel 4 comprises a board 24 having holes 26 arranged to be arranged opposite the orifices 18 provided on the second arms 12c of the moving parts 12 when the clutch spring 3 is mounted on the first wheel 4.
  • the tenons of pivoting 20 of the moving parts 12 are mounted in said holes 26 to allow the free rotation of the moving parts 12 in a radial plane perpendicular to the axis A on the first wheel 4 so that they can switch between their engaged position and their disengaged position .
  • the pivot pins 12 are also arranged to prevent any displacement along the axis A of the clutch spring 3.
  • the hole 26 is arranged to receive the fixing element of said flexible pivot on the first wheel 4.
  • the board 24 of the first wheel 4 is hollowed out so that the first wheel comprises a hub 28, a serge 30 and arms 32 connecting the hub 28 to the serge 30, this making it possible to reduce the friction between the first wheel 4 and the clutch spring 3.
  • the serge 30 has the holes 26 receiving the pivot pins 20.
  • the hub 28 and the arms 32 are particularly configured to reduce the surfaces that may be in contact with the clutch spring 3.
  • the arms 32 of the first wheel 4 may include ribs 34.
  • the first wheel 4 may have a peripheral annular plate 36 to facilitate its handling.
  • the plate 36 is arranged in a plane different from that of the board 24 so as not to generate friction with the clutch spring 3.
  • the first wheel 4 can be made of brass, copper, nickel silver, CuBe, or any other suitable material.
  • the clutch control member 2 is in the form of a rocker pivotally mounted on the frame of the movement by means of a pivot 38 and controlled for example by a column wheel (not shown) actuated by manual control means, or actuated by a spring, in a manner known per se.
  • the clutch control member 2 comprises, at its free end, a radial support element 40 arranged to come to press radially on at least one of the moving parts 12 of the clutch spring 3 to tilt said moving part 12 from its engaged position to its disengaged position, causing the rotation of the hub 10 in turn causing the tilting of the other moving parts 12 in their disengaged position, in order to decouple the second wheel 5 from the first wheel 4.
  • the clutch control member 2 is disposed at the periphery of the clutch spring 3 in a radial plane perpendicular to the axis A, and is arranged to tilt in said radial plane in a direction so that its support element 40 comes to bear on the first arm 12b of one of the moving parts 1 on which it exerts a force sufficient to overcome the force of the elastic element 14 so as to tilt said moving part 12 in the disengaged position, and to tilt in the other direction so that its support element 40 moves away from the clutch spring 3, so as to allow said movable part 12 to return to the engaged position under the effect of its elastic element 14.
  • the support element 40 is disposed substantially in the same plane as the first arms 12b so that, in the engaged position, the flank of the support element 40 is in contact with the outer peripheral side wall 42 of said first arm 12b.
  • the operation of the clutch device according to the invention is as follows:
  • the clutch device 1 being placed in an autonomous chronograph mechanism, the train of the chronograph movement is stopped when the chronograph is not used so that the motor shaft 6 does not rotate.
  • the user starts the timer by pressing the START button.
  • the clutch control member 2 is arranged to be in raised position, without contact with the clutch spring 3, as shown in the figure 5 .
  • the hammer (not shown) for resetting to zero is also in the raised position.
  • the moving parts 12 of the clutch spring 3 mounted articulated on the chronograph drive wheel constituted by the first wheel 4 are in the engaged position, their clutch elements 16 being kept pressed on the outer peripheral wall 5a of the chronograph wheel constituted by the second wheel 5 under the effect of their respective elastic elements 14.
  • the chronograph shaft carrying the chronograph hand is then linked to the movement of the chronograph.
  • the clutch spring 3 driven by the first wheel 4 rotated by its drive shaft 6 causes the rotation of the second wheel 5 and therefore of the chronograph shaft carrying the chronograph hand for measuring the requested time.
  • the user presses the STOP command to stop the train of the chronograph movement, and in particular the chronograph driving wheel or first wheel 4 so that the chronograph wheel or second wheel 5 secured to the chronograph shaft 8 with the chronograph hand also stops.
  • the user can read the timed time indicated by the chronograph hand.
  • the user presses the reset control arranged to control the clutch control member 2 and drop it onto one of the moving parts 12 of the clutch spring 3 as shown in the figure 6 .
  • the moving parts 12 which constitute the periphery of the clutch spring 3 while being movable independently of one another due to their articulation on the first wheel 4, an external radial support of the element d support 40 on any moving part 12 will cause said moving part 12 to tilt in its disengaged position causing the other moving parts 12 to tip over in their disengaged position to release the second wheel 5, whatever the angular position of the clutch spring 3 when the chronograph stops.
  • the support element 40 presses on the outer peripheral side wall 42 of the first arm 12b which is located in front of it, independently of the angular position of the clutch spring 3, so that the movable part 12 carrying said first arm 12b rocks on the first wheel 4 around its pivot pin 20 clockwise so as to release its clutch element 16 from the wall 5a of the second wheel 5.
  • the tilting of the moving part 12 urged by the support element 40 causes the displacement of its second arm 12c and therefore of its elastic element 14, causing the pivoting of the hub 10 counterclockwise around the axis A.
  • this rotation of the hub 10 causes the elastic elements 14 of all the other moving parts 12 to move, which in turn rock around their pivot pin 20 clockwise in the disengaged position.
  • the clutch control member 2 can return to its raised position. It is also possible to leave the clutch control member 2 resting on the clutch spring 3 as well as the hammer on the reset core 9 awaiting the next time measurement by pressing again on the START button. In this case, the clutch control member 2 and the hammer are arranged to rise simultaneously when the START button is pressed again.
  • the clutch control member 2 returns to its raised position, either after resetting to zero or when the START button is pressed again, the moving part 12 which had been urged by the support element 40 tilts counterclockwise and is returned to its engaged position by its elastic element 14 which had been more constrained when tilting in the disengaged position.
  • this movable part 12 causes its second arm 12c and therefore its elastic element 14 to move, causing the hub 10 to pivot clockwise around the axis A.
  • this rotation of the hub 10 causes the displacement of the elastic elements 14 of all the other moving parts 12 which in turn rock around their pivot pin 20 counterclockwise in the engaged position.
  • all of the clutch elements 16 are supported on the chronograph wheel or second wheel 5 so that the second wheel 5 secured to the chronograph shaft 8 carrying the chronograph hand is again linked to the gear train the movement of the autonomous chronograph allowing a new measurement.
  • FIGS 7 and 8 represent a second embodiment of the invention in which the configuration of the first embodiment has been reversed, the first wheel 4 this time being the driven wheel and the second wheel 5 being the driving wheel.
  • the same references are used to designate the same elements.
  • the second wheel 5 is integral with the drive shaft 6 of the movement of the chronograph mounted pivoting about the axis A, which constitutes the shaft of the second wheel, so that the second wheel 5 constitutes the drive wheel of chronograph.
  • the first wheel 4 is integral with the chronograph shaft 8 which carries the chronograph hand, the first wheel 4 constituting in this second embodiment the chronograph wheel.
  • the base 8a of the chronograph shaft is fixedly attached to the first wheel 4, which is pivotally mounted around the upper bearing 7 of the motor shaft 6 comprising a stone fixed in a kitten 43.
  • the first wheel 4 and the clutch spring 3 are positioned around the axis A so that the bottom of the board 24 of the first wheel 4 is turned towards the side of the chronograph shaft 8 and that the elements d clutch 16 moving parts 12 extend coaxially to the axis A, projecting in the direction of the second wheel 5 and the drive shaft 6.
  • This clutch device can be implemented in an autonomous chronograph movement or linked to a basic movement but comprising a mechanism for stopping the motor shaft when the chronograph is not in operation, as in the first embodiment described above. Its operation is then identical to that described above.
  • This clutch device can also be implemented in a chronograph movement associated with a basic watch movement in which the finishing train rotates continuously so that the motor shaft 6 also rotates continuously, including when the mechanism chronograph is in STOP position.
  • a locking member 44 is provided, as shown in the Figures 7 and 8 , arranged to be able to keep the driven wheel in place, here the first wheel 4, when it is disengaged and the chronograph is stopped, in order to prevent its rotation in particular when no time measurement or no reset of the chronograph hand is not performed.
  • the locking member is for example a rocker pivotally mounted on the frame and arranged to have a side wall 44a intended to come to bear on the outer peripheral wall of the driven wheel, here the first wheel 4.
  • the locking member 44 is arranged to be controlled for example by the column wheel or by the clutch control member 2 or any other part of the chronograph mechanism itself controlled by the column wheel.
  • the clutch control member 2 comprises a roller constituting the support element 40, arranged to roll on the periphery of the clutch spring 3 when the moving parts 12 are in the disengaged position, in particular during reset the chronograph hand.
  • roller The dimensions of the roller are chosen so that it can roll constantly on the periphery of the clutch spring 3 without being disturbed by the spaces provided between the outer peripheral side walls 42 of the first arms 12b of the moving parts 12.
  • this clutch device used in a chronograph movement associated with a basic movement where the motor shaft continuously rotates is as follows: when the chronograph is engaged by pressing the START position, the control member clutch 2, the locking member 44, and the hammer are in the raised position.
  • the moving parts 12 of the clutch spring 3 mounted articulated on the chronograph wheel formed by the first wheel 4 are in the engaged position, their clutch elements 16 being kept pressed on the outer peripheral wall 5a of the chronograph driving wheel constituted by the second wheel 5 under the effect of their respective elastic elements 14.
  • the chronograph shaft carrying the chronograph hand is then linked to the basic movement.
  • the clutch spring 3 then rotated by the second wheel 5 driven by its motor shaft 6 takes the first wheel 4 and therefore the chronograph shaft carrying the chronograph hand for the requested time measurement.
  • the clutch control member 2 is arranged so that pressing the STOP control causes it to fall onto one of the moving parts 12 of the clutch spring 3 in order to tilt all the moving parts 12 into their disengaged position. as described above for disengaging the first wheel 4 from the second wheel 5.
  • the latter continues to rotate, its drive shaft being linked to the basic watch movement.
  • the chronograph shaft carrying the chronograph hand is no longer linked to the basic watch movement.
  • the locking member 44 is arranged so that pressing the STOP command causes it to fall onto the driven wheel, here the first wheel 4, so that the chronograph shaft 8 carrying the chronograph hand is held in place on the timed time to read. The hammer remained lifted.
  • the clutch control member 2 is arranged to remain pressed on the clutch spring 3 so as to hold the first wheel 4 and the chronograph shaft 8 carrying the chronograph hand disengaged from the basic movement.
  • the locking member 44 is arranged to disengage from the driven wheel, here the first wheel 4 when pressing the RESET command in order to release said first wheel 4 constituting the chronograph wheel.
  • the hammer can then fall on the heart 9 in order to reset the chronograph hand to zero.
  • the roller constituting the support element 40 of the clutch control member 2 rolls on the periphery of the clutch spring 3 which, integral with the chronograph shaft 8, rotates with him.
  • the clutch control member 2 remains in place so as to keep the first wheel 4 and the chronograph shaft 8 disengaged from the second wheel 5 which continues to rotate.
  • the chronograph hand is held on the chronograph zero by the hammer.
  • the clutch device according to the first embodiment of the figures 1 to 6 could be implemented in a chronograph movement associated with a basic watch movement in which the finishing train rotates continuously so that the motor shaft 6 also rotates continuously, including when the chronograph mechanism is in the STOP position.
  • a locking member 44 as shown in the Figures 7 and 8 , arranged to be able to hold the driven wheel in place, here the second wheel 5, when it is disengaged and the chronograph is stopped, in order to prevent its rotation in particular outside any measurement of time or of resetting to zero chronograph hand.
  • the clutch control member 2 comprises a roller constituting the support element 40, arranged to roll on the periphery of the clutch spring 3 when the moving parts 12 are in position. disengaged, and that the clutch spring 3 rotates continuously driven by the motor shaft 6.
  • this clutch device used in a chronograph movement associated with a basic movement where the motor shaft continuously rotates is as follows: when the chronograph is engaged by pressing the START position, the control member clutch 2, the locking member 44, and the hammer are in the raised position.
  • the movable parts 12 of the clutch spring 3 mounted articulated on the chronograph drive wheel constituted by the first wheel 4 are in the engaged position, their clutch elements 16 being kept supported on the outer peripheral wall 5a of the chronograph wheel constituted by the second wheel 5 under the effect of their respective elastic elements 14.
  • the chronograph shaft carrying the chronograph hand is then linked to the basic movement.
  • the clutch spring 3 then driven by the first wheel 4 driven by its motor shaft 6 rotates the second wheel 5 and therefore the chronograph shaft carrying the chronograph hand for measuring the requested time.
  • the clutch control member 2 is arranged so that pressing the STOP control causes it to fall onto one of the moving parts 12 of the clutch spring 3 in order to tilt all the moving parts 12 into their disengaged position. as described above for disengaging the second wheel 5 from the first wheel 4.
  • the latter continues to rotate, its drive shaft 6 being linked to the basic clockwork movement, so that the clutch spring 3 also continues to rotate.
  • the roller constituting the support element 40 of the clutch control member 2 rolls on the periphery of the clutch spring 3 to maintain the disengaged position.
  • the chronograph shaft 8 carrying the chronograph hand is no longer linked to the basic watch movement.
  • the locking member 44 is arranged so that pressing the STOP command causes it to fall on the driven wheel, here the second wheel 5, so that the chronograph shaft 8 carrying the chronograph hand is held in place on the timed time to read. The hammer remained lifted.
  • the clutch control member 2 is arranged to remain pressed on the clutch spring 3 so as to maintain the second wheel 5 and the chronograph shaft 8 carrying the chronograph hand disengaged from the basic movement.
  • the locking member 44 is arranged to disengage from the driven wheel, here the second wheel 5 when pressing the RESET command in order to release said second wheel 5 constituting the chronograph wheel.
  • the hammer can then fall on the heart 9 in order to reset the chronograph hand to zero.
  • the roller constituting the support element 40 of the clutch control member 2 continues to roll on the periphery of the clutch spring 3 which, carried by the first wheel 4 and the motor shaft 6, rotates with them.
  • the clutch control member 2 remains in place so as to keep the second wheel 5 and the chronograph shaft 8 disengaged from the first wheel 4 which continues to rotate.
  • the chronograph hand is held on the chronograph zero by the hammer.
  • the clutch device makes it possible to disengage the driving wheel from the driven wheel whatever the angular position of the clutch spring.
  • the external radial support element as well as the distribution of the first arms 12b of the moving parts 12 on the periphery of the clutch spring 3 make it possible to be able to actuate the clutch spring 3 efficiently at any point, independently from its angular position.
  • the friction clutch device of the invention makes it possible to avoid any shift in information during the clutch.
  • the radial actuation of the clutch spring makes it possible to produce a compact clutch mechanism with easy release. A low tripping force provides a high friction torque.
  • the clutch device is preferably used in a chronograph mechanism, but it is obvious that it can be used in any other clock mechanism requiring a clutch mechanism, for example an alarm triggering mechanism.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
EP18214687.8A 2018-12-20 2018-12-20 Kupplungsvorrichtung und chronographenmechanismus, der eine solche kupplungsvorrichtung umfasst Active EP3671370B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18214687.8A EP3671370B1 (de) 2018-12-20 2018-12-20 Kupplungsvorrichtung und chronographenmechanismus, der eine solche kupplungsvorrichtung umfasst

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18214687.8A EP3671370B1 (de) 2018-12-20 2018-12-20 Kupplungsvorrichtung und chronographenmechanismus, der eine solche kupplungsvorrichtung umfasst

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EP3671370A1 true EP3671370A1 (de) 2020-06-24
EP3671370B1 EP3671370B1 (de) 2021-08-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4092491A1 (de) * 2021-05-19 2022-11-23 Patek Philippe SA Genève Uhrwerk mit kupplung
EP4137893A1 (de) 2021-08-20 2023-02-22 Montres Breguet S.A. Blendenartige auslösevorrichtung, insbesondere für uhrwerke
EP4137892A1 (de) 2021-08-20 2023-02-22 Montres Breguet S.A. Blendenartige auslösevorrichtung, insbesondere für uhrwerke
EP4163732A1 (de) 2021-10-11 2023-04-12 LVMH Swiss Manufactures SA Kupplungsuhrmechanismus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085832A1 (de) 2008-02-04 2009-08-05 Frédéric Piguet S.A. Chronographenvorrichtung mit Reibungskupplung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085832A1 (de) 2008-02-04 2009-08-05 Frédéric Piguet S.A. Chronographenvorrichtung mit Reibungskupplung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4092491A1 (de) * 2021-05-19 2022-11-23 Patek Philippe SA Genève Uhrwerk mit kupplung
EP4137893A1 (de) 2021-08-20 2023-02-22 Montres Breguet S.A. Blendenartige auslösevorrichtung, insbesondere für uhrwerke
EP4137892A1 (de) 2021-08-20 2023-02-22 Montres Breguet S.A. Blendenartige auslösevorrichtung, insbesondere für uhrwerke
CN115903431A (zh) * 2021-08-20 2023-04-04 宝玑表有限公司 尤其用于制表的膜片型展开装置
CN115903430A (zh) * 2021-08-20 2023-04-04 宝玑表有限公司 特别是用于钟表的膜片式展开装置
EP4163732A1 (de) 2021-10-11 2023-04-12 LVMH Swiss Manufactures SA Kupplungsuhrmechanismus

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