EP3475765B1 - Uhrwerkshemmung - Google Patents

Uhrwerkshemmung Download PDF

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Publication number
EP3475765B1
EP3475765B1 EP17733910.8A EP17733910A EP3475765B1 EP 3475765 B1 EP3475765 B1 EP 3475765B1 EP 17733910 A EP17733910 A EP 17733910A EP 3475765 B1 EP3475765 B1 EP 3475765B1
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EP
European Patent Office
Prior art keywords
winding
lever
leaf spring
escapement
elastic member
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.)
Active
Application number
EP17733910.8A
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English (en)
French (fr)
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EP3475765A1 (de
Inventor
Stéphane OES
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
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Publication of EP3475765A1 publication Critical patent/EP3475765A1/de
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/045—Oscillators acting by spring tension with oscillating blade springs
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/10—Escapements with constant impulses for the regulating mechanism
    • 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
    • G04B15/00—Escapements
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel

Definitions

  • the present invention relates to a horological escapement, that is to say a mechanism used to maintain and count the oscillations of a horological regulator.
  • the present invention relates more particularly to an escapement comprising a bistable elastic member receiving energy from a driving member, for example a barrel, and communicating it to the regulator.
  • a driving member for example a barrel
  • An exhaust of this type is described in patent applications WO 99/64936 , WO 2009/118310 and CH 705674 .
  • the bistable elastic member is a leaf spring working in buckling.
  • the leaf spring is fixed by its two ends to recesses or to pivot members, and its midpoint is kept aligned with said two ends. The distance separating the two recesses is such that the leaf spring is subjected to compression which forces it to deform according to a second mode buckling.
  • the leaf spring thus has two convexities in opposite directions on either side of its midpoint.
  • the leaf spring can occupy two stable states, the passage from one of these stable states to the other being effected by reversing the direction of the two convexities.
  • a winding latch acting symmetrically in the area of the two convexities deforms the leaf spring from a first of its stable states to a metastable state close to an unstable state corresponding to a buckling of the fourth mode, in order to arm the leaf spring.
  • a detent lever located in the mid-point zone acts on the leaf spring to make it go beyond its unstable state and thus make it switch to its second stable state by releasing its energy.
  • the winding lever is actuated alternately by two escape wheels secured to escape gears which mesh with the last mobile of the finishing gear train of the timepiece.
  • the trigger lever cooperates with a sprung balance regulator and for this purpose comprises a fork of the same type as the conventional anchor forks.
  • the escape wheels comprise winding cams at their periphery for actuating the winding lever. These winding cams end with locking stops.
  • the winding phase of the leaf spring by the winding lever ends when the latter is blocked by one of the locking stops of the escape wheel with which it cooperates, which keeps the leaf spring in its position. metastable condition and immobilizes the two escape wheels, the finishing gear train and the winding lever.
  • the deformation of the leaf spring from its metastable state to its second stable state under the action of the chainring pin and then of its relaxation causes a rotation of the winding lever which unlocks the escape wheels and brings the lever to winding in contact with the other escape wheel to start a cycle symmetrical to the previous one, after the impulse given to the plate pin.
  • the present invention aims to remedy these drawbacks, or at least to mitigate them, and to this end proposes a horological escapement comprising a bistable elastic member, a winding lever arranged to arm the bistable elastic member during phases of 'winding, and a trigger lever arranged to be driven by a trigger of the bistable elastic member after each winding phase in order to communicate a pulse to a regulator, characterized in that it comprises a single exhaust mobile for drive the winding latch during the winding phases, the escape mobile comprising a winding member arranged to cooperate with the winding elements of the winding lever, in the manner of a gear, to make rotate the winding lever alternately in opposite directions.
  • the winding elements are defined by an inner wall of a portion of the winding lever which surrounds the winding member.
  • said inner wall follows over substantially 360 ° the trajectory of the apex of a tooth of the winding member in a reference linked to the winding lever during rotation of the winding member, in order to abut against the winding member in the event of an impact and thus secure the position of the winding lever.
  • the winding elements are for example lugs.
  • the winding member is for example a star.
  • the detent lever is arranged to cooperate with the bistable elastic member in the area of a midpoint of the bistable elastic member and the winding lever is arranged to cooperate with the bistable elastic member on both sides. other of said area.
  • an escapement for a clockwork movement comprises an escapement mobile 1, a bistable leaf spring 2, a winding lever 3 and an expansion lever 4.
  • the escape wheel 1 rotates around an axis A, in the direction indicated by the arrow F1, under the action of the movement motor member, typically formed by one or more barrels.
  • the escapement mobile 1 comprises an escape pinion 5 which meshes with the movement finishing gear, a winding member 6 which, in the example shown, is in the form of a star, and a control wheel. locking 7 having inclined teeth 8 at its periphery.
  • the escape pinion 5, the winding star 6 and the locking wheel 7 are coaxial and integral.
  • the winding star 6 and the locking wheel 7 can be in one piece.
  • the winding lever 3 and the detent lever 4 pivot around the same imaginary axis B which corresponds to the midpoint of the leaf spring 2, but are free to pivot with respect to one another.
  • the imaginary axis B is for example the axis of a rod (physical axis) driven into the winding lever 3, pivoting in bearings of the frame of the movement and around which the trigger lever 4 pivots.
  • the latches 3, 4 could be mounted on respective axes offset from one another, like the winding and detent levers described in the patent application. WO 99/64936 .
  • the rockers 3, 4 could not be mounted on physical axes but be guided around the same imaginary axis or two respective imaginary axes by flexible guidance systems.
  • the leaf spring 2 is integral with the detent lever 4 and consists of two elastic leaves 2a, 2b each having one end joined to the detent lever 4 and another end joined to the frame of the movement. Said other end of each elastic blade 2a, 2b can be joined to the frame of the movement by means of an outer frame (not shown) surrounding the leaf spring 2 and fixed to said frame, which outer frame can be integral with the spring -blade 2, as described in the patent applications WO 2009/118310 and CH 705674 .
  • the leaf spring 2 can also be a piece attached to the detent lever 4 and to the outer frame.
  • the leaf spring 2 has two convexities of opposite directions on either side of its midpoint and can pass from a first stable state to a second stable state by reversing the direction of each of the two convexities.
  • the leaf spring 2 is either pre-stressed so as to work in buckling or preformed to, in the rest state, already have two convexities as described in the international patent application. WO 2017/032528 of the present plaintiff.
  • the outer frame is deformable to allow buckling of the leaf spring 2.
  • the outer frame is rigid.
  • the winding lever 3 comprises two arms carrying at their ends two pins 3a, 3b engaged in eyelets (not shown) of the two elastic blades 2a, 2b respectively.
  • a reverse configuration is of course possible where the pins 3a, 3b would be carried by the elastic blades 2a, 2b, respectively, to engage in the eyelets of the winding lever 3.
  • other connection modes between the winding lever 3 and the elastic blades 2a, 2b are possible, for example two pins at each end of the winding lever 3 clamping the corresponding elastic blade 2a, 2b.
  • the winding lever 3 further comprises a part 9 in the form of a ring which surrounds the winding star 6.
  • the inner wall 10 of this part 9 has winding elements 11, 12 (cf. figure 2 ) formed by lugs, and is furthermore shaped irregularly to fulfill a safety function against shocks, that is to say to prevent rotation of the winding lever 3 beyond a certain play during a rotary or linear shock received by the clockwork movement.
  • the inner wall 10 of part 9 follows over substantially 360 ° the trajectory of the apex of any one of the teeth of the winding star 6 in a reference linked to the winding lever 3 during the rotation of the winding star 6 and of the oscillations of the winding lever 3 which result therefrom, in order to abut against the winding star 6 in the event of an impact.
  • the positioning of the winding lever 3 is guaranteed according to a small, predefined play, and thus prevents the winding lever 3 from triggering the tilting of the leaf spring 2 in an untimely manner.
  • the detent lever 4 comprises an inlet arm 13 terminated by an inlet spout 14 and an outlet arm 15 terminated by an outlet spout 16. These inlet and outlet spouts 14, 16 are arranged to cooperate with the teeth 8 of the locking wheel 7, as will be explained below.
  • the trigger lever 4 also includes a rod 17 ending in a fork 18 similar to that of a traditional anchor, comprising a first horn 19 and a second horn 20.
  • the fork 18 is arranged to cooperate with a plate pin 21 carried by a large plate 22 coaxial and integral with the movement regulator.
  • the regulator (not shown) oscillates around an axis C, is for example of the sprung balance type but can also be an oscillator without a physical axis, with flexible blades.
  • the escapement according to the invention operates according to cycles each corresponding to an oscillation (two vibrations) of the regulator.
  • Each cycle consists of two half cycles.
  • Each half-cycle corresponds to an alternation of the regulator and includes the following phases: arming, locking, relaxation.
  • the winding phase of the first half-cycle begins when a tooth 6a of the winding star 6 meets a first, 11, of the winding elements 11, 12 of the winding lever 3 (cf. figure 1 ). By continuing to move, tooth 6a pushes this first winding element 11, which causes the winding lever 3 to pivot about its axis B in the direction indicated by arrow F2.
  • This movement of the winding lever 3 arms the leaf spring 2 by making it pass from a first stable state to a metastable state close to an unstable state. This deformation of the leaf spring 2 is imperceptible in the region of the midpoint, so that the detent lever 4 remains stationary.
  • the principle of the state of the art has the defect that under the action of the winding of the leaf spring, the trigger lever can move slightly and lose contact with the limitation stop.
  • the trigger lever can thus vibrate during shocks or because of the natural frequency of the assembly comprising the trigger lever and the leaf spring.
  • Such a vibration can be harmful because in certain cases the dart associated with the trigger lever can rub against the small plate and slow down the regulator.
  • the present invention by the pull exerted on the trigger lever 4 by the locking wheel 7, solves or at least mitigates this problem.
  • the locking zone being relatively close to the axis of rotation B of the detent lever 4, the locking torque is potentially lower than in the state of the art.
  • the leaf spring 2 then releases the energy accumulated during winding by switching to its second stable state, the reverse of the first stable state.
  • This sudden deformation of the leaf spring 2 causes the detent lever 4 to pivot in the direction F2.
  • the inlet nose 14 of the detent lever 4 leaves the tooth 8a of the locking wheel 7, defeating the force support exerted on said inlet nozzle 14 under the action of the movement motor member, and unlocks the exhaust mobile 1, then the internal face of the second horn 20 communicates an impulse to the plate pin 21 and therefore to the regulator (cf. figure 4 ).
  • the relaxation phase ends when the relaxation lever 4 comes into abutment against the second limit stop 26 (cf. figure 5 ) in the second steady state of leaf spring 2.
  • the locking / unlocking of the exhaust mobile 1 in the present invention is effected directly by the detent lever 4 by means of the inlet and outlet nozzles 14, 16, therefore so static, rather than by the winding lever controlled by the leaf spring itself controlled by the trigger lever as in the state of the art.
  • the leaf spring 2 is only used for the impulse to the regulator. This allows the escape mobile 1 to be unlocked early enough, i.e. before the governor reaches its equilibrium position, to leave leaf spring 2 free to provide its impetus at the appropriate time, when the governor is close to its equilibrium position . The instant of the start of the pulse can therefore be precise, which favors isochronism of the regulator.
  • the use of a single exhaust mobile 1 comprising the winding elements 11, 12 eliminates the need to index two exhaust mobile relative to each other, therefore facilitates assembly, and reduces bulk and inertia.
  • the cooperation between the teeth of the winding star 6 and the winding elements 11, 12 generates little or no friction, unlike the mechanism winding cams according to documents.
  • WO 99/64936 , WO 2009/118310 and CH 705674 which slide on pins carried by the winding lever.
  • the cooperation between the winding star 6 and the winding elements 11, 12 is similar to that of a gear, the winding star 6 exerting a tangential force on the inner wall 10.
  • the winding star 6 and the locking wheel 7 could form a single piece on one level.
  • the teeth of the star 6 would ensure in certain positions the winding and in other positions the locking.
  • the bistable elastic member constituted by the leaf spring 2 could be formed from a single elastic leaf 2a or 2b and the winding lever 3 could comprise a single arm cooperating at its end with the elastic leaf.
  • the bistable elastic member could comprise several leaf springs each comprising one or more elastic leaves.
  • the exhaust mobile 1 could be located on the other side of the regulator or even be coaxial with said regulator (that is to say with the axis C).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Springs (AREA)

Claims (6)

  1. Uhrwerkshemmung, die ein bistabiles elastisches Organ (2), eine Spannungswippe (3), die gestaltet ist, um das bistabile elastische Organ (2) während Spannungsphasen zu spannen, und eine Gesperrwippe (4) umfasst, die gestaltet ist, um durch ein Gesperr des bistabilen elastischen Organs (2) nach jeder Spannungsphase angetrieben zu werden, um einen Impuls auf einen Regulator zu übertragen, dadurch gekennzeichnet, dass sie ein einziges Hemmungsdrehteil (1) zum Antreiben der Spannungswippe (3) während der Spannungsphasen umfasst, wobei das Hemmungsdrehteil (1) ein Spannungsorgan (6) umfasst, das gestaltet ist, um mit Spannungselementen (11, 12) der Spannungswippe (3) auf die Weise eines Getriebes zusammenzuwirken, um zu bewirken, dass die Spannungswippe (3) abwechselnd in entgegengesetzte Richtungen schwenkt.
  2. Uhrwerkshemmung nach Anspruch 1, dadurch gekennzeichnet, dass die Spannungselemente (11, 12) durch eine Innenwand (10) eines Teils (9) der Spannungswippe (3) definiert sind, die das Spannungsorgan (6) umgibt.
  3. Uhrwerkshemmung nach Anspruch 2, dadurch gekennzeichnet, dass die Innenwand (10) bei der Drehung des Spannungsorgans (6) der Bewegungsbahn der Spitze eines Zahns des Spannungsorgans (6) in einer Markierung, die mit der Spannungswippe (3) verbunden ist, auf im Wesentlichen 360° folgt, um im Fall eines Stoßes gegen das Spannungsorgan (6) anzustoßen und so die Position der Spannungswippe (3) zu sichern.
  4. Uhrwerkshemmung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Spannungselemente (11, 12) Dorne sind.
  5. Uhrwerkshemmung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Spannungsorgan (6) ein Stern ist.
  6. Uhrwerkshemmung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Gesperrwippe (4) gestaltet ist, um mit dem bistabilen elastischen Organ (2) in der Zone eines Mittelpunkts (B) des bistabilen elastischen Organs (2) zusammenzuwirken, und die Spannungswippe (3) gestaltet ist, um mit dem bistabilen elastischen Organ (2) auf beiden Seiten (3a, 3b) der Zone zusammenzuwirken.
EP17733910.8A 2016-06-27 2017-06-20 Uhrwerkshemmung Active EP3475765B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16176386 2016-06-27
PCT/IB2017/053668 WO2018002773A1 (fr) 2016-06-27 2017-06-20 Echappement d'horlogerie

Publications (2)

Publication Number Publication Date
EP3475765A1 EP3475765A1 (de) 2019-05-01
EP3475765B1 true EP3475765B1 (de) 2020-07-29

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EP17733910.8A Active EP3475765B1 (de) 2016-06-27 2017-06-20 Uhrwerkshemmung

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EP (1) EP3475765B1 (de)
WO (1) WO2018002773A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3599514B1 (de) 2018-07-25 2023-06-07 Sowind S.A. Hemmungsmechanismus mit bistabilen und monostabilen federn

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999064936A1 (fr) 1998-06-08 1999-12-16 Manufacture Des Montres Rolex S.A. Procede pour transmettre des impulsions d'energie mecanique d'unesource motrice a un regulateur oscillant
DE602007001230D1 (de) * 2007-03-09 2009-07-16 Eta Sa Mft Horlogere Suisse Hemmung mit Tangentialimpulsen
EP2105806B1 (de) 2008-03-27 2013-11-13 Sowind S.A. Hemmungsmechanismus
CH703333B1 (fr) * 2010-06-22 2015-07-15 Bruno Fragnière Ancre d'échappement.
CH705674B1 (fr) 2011-10-27 2016-11-30 Sowind S A Mécanisme d'échappement.
EP3338144B1 (de) 2015-08-21 2019-09-25 Patek Philippe SA Genève Bistabile mechanische vorrichtung für uhrwerke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
WO2018002773A1 (fr) 2018-01-04
EP3475765A1 (de) 2019-05-01

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