EP2288967A1 - Mouvement horloger comprenant un variateur de couple et piece d'horlogerie munie d'un tel mouvement - Google Patents
Mouvement horloger comprenant un variateur de couple et piece d'horlogerie munie d'un tel mouvementInfo
- Publication number
- EP2288967A1 EP2288967A1 EP09765552A EP09765552A EP2288967A1 EP 2288967 A1 EP2288967 A1 EP 2288967A1 EP 09765552 A EP09765552 A EP 09765552A EP 09765552 A EP09765552 A EP 09765552A EP 2288967 A1 EP2288967 A1 EP 2288967A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- mobile
- ratchet
- clutch
- movement
- 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
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B1/00—Driving mechanisms
- G04B1/10—Driving mechanisms with mainspring
- G04B1/22—Compensation of changes in the motive power of the mainspring
-
- 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
Definitions
- the present invention relates to a type of mechanical watch movement and a timepiece provided such a movement. More specifically, the invention relates to a watch movement of the type comprising a barrel comprising a drum provided with a peripheral toothing and housing at least one barrel spring secured to the drum by a first end and a barrel shaft by a second end.
- the barrel shaft has a portion arranged outside the drum being integral with a ratchet, a locking member being provided to prevent the latter from rotating in a predefined direction.
- the movement comprises a finishing train of which a mobile is arranged in engagement with the toothing of the barrel.
- the elastic potential energy stored in a barrel is proportional to its power reserve, the torque it releases and its angular velocity.
- this energy is important and the larger the barrel is bulky for a given type of mainspring.
- patent CH 508 905 describes for example a watch movement comprising two barrels whose drums are in direct contact with the mobile of high average.
- the amount of energy required to maintain oscillations and therefore a good accuracy of the mechanical oscillator depends on the constraints it undergoes. Thus, this amount of energy is not the same depending on whether the corresponding timepiece is worn by a mobile user or at rest, stored in a box for example or placed on a piece of furniture. The movements of the state of the art not taking into account these differences, the running of the timepiece is faster when it is at rest than when it is worn. Disclosure of the invention
- An object of the invention is to provide a solution to the aforementioned problems by providing a watch movement comprising a mechanism for occasionally changing the value of the torque released by the barrel in the work train.
- the present invention relates to a watch movement of the type mentioned above, characterized in that it comprises a clutch rocker capable of being displaced alternately between a first and a second position, respectively engaged and disengaged, in response to a predefined action.
- the clutch rocker carries a clutch movable arranged to establish a kinematic connection between the ratchet and the mobile of the finishing train which is engaged with the barrel drum in the engaged position and to interrupt it in the disengaged position.
- the clutch rocker is also arranged to disable the locking member of the ratchet in the engaged position.
- the finishing gear can be attacked either only by the barrel drum, in a conventional manner, or simultaneously by the drum and from the barrel shaft.
- it shows a significant increase in the torque released in the gear train compared to the conventional situation.
- the effective angular speed of the cylinder is increased and its power reserve decreased. Thanks to these characteristics, it is possible temporarily to provide additional torque, or auxiliary torque, the finishing gear to compensate for the removal of a fraction of the main torque (that is to say, the one released by the barrel when its shaft is locked) by the operation of a complication, which ensures a good stability of the running accuracy of the mechanical oscillator.
- the predefined action causing the displacement of the rocker in one direction or the other may be associated with the activation and deactivation of a chronograph mechanism.
- the rocker is then arranged to be positioned in its engaged position at the start of the measurement of a time, to compensate for the torque drop in the finishing train necessary for the operation of the chronograph train and the drive of the components. corresponding display.
- the default operating position of the clutch rocker is engaged, while a predefined action of the user allows to disengage, for example following an action of the user on an external control member of the corresponding timepiece.
- the positions of the clutch rocker are then associated with respective active and watch modes of the timepiece.
- FIG. 1 represents a simplified top view of a general embodiment of a watch movement according to the invention. Mode (s) of realization of the invention
- FIG. 1 shows, in a simplified top view, a watch movement according to a general embodiment of the invention. Only the structural elements having a relationship with the invention have been shown in the figure, for the sake of clarity.
- the watch movement comprises a plate 1 on which is mounted a conventional barrel 2, including a drum 3, having a toothing at its periphery, and a barrel shaft 4 of substantially square section.
- the toothing of the drum 3 is arranged in engagement with a center mobile 6, by its center pinion 7.
- the center mobile also comprises a center wheel 8 arranged in engagement with additional mobiles
- the finishing gear of the watch movement to ensure a kinematic connection between the barrel and a mechanical oscillator movement such as, for example, a balance spring associated with a conventional exhaust (not shown).
- the barrel shaft 4 has a portion disposed outside the barrel drum to cooperate with a square hole in a barrel ratchet 10.
- the barrel ratchet has a conventional kinematic link with a pinion of winding 11, via a first reference 12, a second return 13 and a crown wheel 14.
- the winding pinion is carried by a winding stem 15 for driving it in rotation, in response to a suitable action of a user, to raise the spring (not visible) barrel.
- a locking member of the barrel ratchet is also provided, in the form of a pawl 17, to allow rotation of the ratchet, in the clockwise rotation direction in FIG. 1, during winding operations, that is, in response to a rotation of the winding stem clockwise.
- the pawl maintains a fixed angular position of the barrel ratchet 10, in a known manner.
- elastic means are provided to maintain the pawl engaged with the toothing of the ratchet 17.
- the watch movement further comprises a clutch lever 20 having, in FIG. 1, the shape of a helix comprising a central portion 21 from which three arms 22 extend, 23 and 24 curved.
- the clutch rocker is intended to be pivotally mounted on the movement, through a hole 25 formed in its central portion, between a disengaged position (Figure 1) and an engaged position (not shown).
- the clutch rocker carries a rotary clutch mobile 27, at the end of its first arm 22, comprising a pinion 28 and a wheel 29, the latter being arranged in engagement with the center pinion 7.
- the pawl has substantially the shape of a V between the arms of which is disposed the pin 30, so as to cooperate with an abutment surface 32 of the pawl.
- the clutch rocker has a contact surface 33 on its third arm 24 arranged to cooperate with a rotary control member 34.
- a rotary control member 34 presents here, by way of non-limiting illustration, the shape of a star. eight-branch rotary mount with reference to the movement stage.
- the star 34 carries four columns 35 intended to cooperate with the contact surface 33 of the clutch rocker, a jumper 36 being provided for positioning the star in each of its eight functional positions.
- the movement also comprises a control lever 37 pivotally mounted with reference to the plate and arranged here to be actuated by a user via an external controller (not shown).
- the control lever 37 comprises a finger 38, at one of its ends, positioned to cooperate with the branches of the star 34 and rotate the latter, typically in response to pressure of the user on the organ outside control.
- control lever 37 When the control lever 37 is actuated, it acts on the star 34 to rotate a half-step (in the clockwise direction in Figure 1) and lower the third arm 24 of the clutch rocker in a vacuum between two columns 35. The clutch rocker then rotates in the clockwise rotation direction.
- the clutch mobile 27 approaches the barrel and engages the ratchet 17 by its pinion 28. At the same time, the pin 30 acts on the abutment surface 32 of the pawl to lift the latter and release the ratchet. The clutch rocker is then in the engaged position.
- the barrel 2 releases energy in the work train by the mobile center 6 at a time from its drum 3 and from its shaft 4, through the ratchet 17, pinion 28 and of the wheel 29, in engagement with the center pinion 7. Thanks to these characteristics, an auxiliary torque is released by the barrel, the value of which is mainly a function of the gear ratios occurring between the ratchet 17 and the center pinion 7.
- the theoretical value of the auxiliary torque is of the order of half of the main torque provided by the barrel from its drum.
- the gears each giving rise to a loss of efficiency of the order of 8 to 10% the overall torque received by the center gear is of the order of 1.3 times the main torque, that is to say the torque it receives from the barrel drum when the ratchet is locked.
- the movement that has just been described may, for example, be advantageously implemented in relation to a chronograph function movement. Indeed, as mentioned above, the operation of a chronograph mechanism requires energy, taken from the gear train and, which can adversely affect the good running accuracy of the mechanical oscillator in a conventional watch movement.
- the clutch rocker 20 may be coupled to the chronograph mechanism such that it moves from its disengaged position to its engaged position when the measurement of a time is activated. Conversely, when the chronograph is stopped, the clutch lever returns to its disengaged position.
- control lever 37 is actuated from the start-stop pusher typical of a timepiece chronograph function, or that the finger 38 of actuating the rocker is integrated directly to a conventional chronograph control lever.
- the clutch rocker cooperates directly with a column wheel or with a conventional shuttle, without it being necessary in this case to provide a specific control lever to actuate its movements.
- the movement described above can be used to optimize the power reserve of a corresponding timepiece by providing that the auxiliary torque is released in normal operation, the clutch rocker being in its engaged position, while only the main torque is released in an energy saving mode of operation, in which the clutch rocker is in its disengaged position.
- the mainspring is calibrated in such a way that the energy that the barrel provides to the finishing gear, when only the main torque is released, corresponds to the needs necessary for guarantee a good accuracy of the mechanical oscillator of the movement when it does not undergo any particular mechanical stress, for example because the timepiece is stationary.
- the mainspring and the gear ratios between the ratchet and the center gear are arranged in such a way that the total torque released, when the auxiliary torque is supplied in addition to the main torque, makes it possible to maintain the same level of precision of operation of the mechanical oscillator while the timepiece is worn by a user.
- the total power reserve of the barrel is increased compared to a conventional timepiece, that is to say compared to what it would be without the energy saving operation mode.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Unknown Time Intervals (AREA)
- Electromechanical Clocks (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH9412008 | 2008-06-18 | ||
| PCT/EP2009/004118 WO2009152972A1 (fr) | 2008-06-18 | 2009-06-09 | Mouvement horloger comprenant un variateur de couple et piece d'horlogerie munie d'un tel mouvement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2288967A1 true EP2288967A1 (fr) | 2011-03-02 |
| EP2288967B1 EP2288967B1 (fr) | 2011-11-02 |
Family
ID=41323381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09765552A Active EP2288967B1 (fr) | 2008-06-18 | 2009-06-09 | Mouvement horloger comprenant un variateur de couple et piece d'horlogerie munie d'un tel mouvement |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2288967B1 (fr) |
| AT (1) | ATE532110T1 (fr) |
| WO (1) | WO2009152972A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH711931A2 (fr) * | 2015-12-18 | 2017-06-30 | Montres Breguet Sa | Mécanisme de réglage de rapport de couple entre des mobiles d'horlogerie. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH23477A (fr) * | 1901-03-06 | 1902-07-31 | Paul Reymond | Dispositif de prise de force sur le barillet moteur d'un mouvement de montre ou de pendule à sonnerie |
| CH30361A (de) * | 1904-02-18 | 1904-12-15 | Martin Wortmann | Uhr |
| DE192775C (de) * | 1907-03-05 | 1907-12-12 | Ver Freiburger Uhrenfabriken Ag | Federantrieb, besonders für Uhren |
| US942374A (en) * | 1907-10-03 | 1909-12-07 | Die Vereinigten Freiburger Uhrenfabriken Ag Incl Vormals Gustav Becker | Clock and the like. |
| CH106255A (de) * | 1923-04-20 | 1924-08-16 | Habrzycki Bialek Konstanty Bol | Einrichtung zum Ausgleich der Wirkung von Spiralfedern. |
| CH287289A (fr) * | 1950-09-19 | 1952-11-30 | Vuilleumier Marcel | Pièce d'horlogerie. |
| ATE412204T1 (de) * | 2000-03-20 | 2008-11-15 | Audemars Piguet Renaud Et Papi | Ratschenantriebsmechanismus für aufzugssperrad in einer uhr |
-
2009
- 2009-06-09 AT AT09765552T patent/ATE532110T1/de active
- 2009-06-09 EP EP09765552A patent/EP2288967B1/fr active Active
- 2009-06-09 WO PCT/EP2009/004118 patent/WO2009152972A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009152972A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE532110T1 (de) | 2011-11-15 |
| WO2009152972A1 (fr) | 2009-12-23 |
| EP2288967B1 (fr) | 2011-11-02 |
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