EP3740821A1 - Mecanisme horloger pour l'affichage d'information - Google Patents
Mecanisme horloger pour l'affichage d'informationInfo
- Publication number
- EP3740821A1 EP3740821A1 EP19704047.0A EP19704047A EP3740821A1 EP 3740821 A1 EP3740821 A1 EP 3740821A1 EP 19704047 A EP19704047 A EP 19704047A EP 3740821 A1 EP3740821 A1 EP 3740821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- follower member
- cam
- drive wheel
- flexible blades
- indicator drive
- 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
- G04B19/00—Indicating the time by visual means
- G04B19/26—Clocks or watches with indicators for tides, for the phases of the moon, or the like
- G04B19/262—Clocks or watches with indicators for tides, for the phases of the moon, or the like with indicators for astrological informations
-
- 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
- G04B13/00—Gearwork
Definitions
- the present invention relates to a clock mechanism, and more particularly to a clock mechanism for displaying information relating to astronomy such as the hours of sunrise and sunset at the level of the dial of a watch.
- a rake comprises a feeler which, by the action of a return spring on the rake, is supported on the periphery of a fixed cam in rotation with a wheel which drives it .
- the rotation of the cam angularly moves the rake allowing the toothed sector of the rake to rotate a drive wheel which carries an indicator member.
- the indicating member usually a needle, indicates on the dial of the watch the value read on the cam.
- the information to be displayed corresponds to the variable radius of the cam.
- the arcuate stroke of the rake introduces a read error that must be compensated by correcting the shape of the cam.
- This reading error is all the greater as the radius variations of the cam are large.
- the shape of the cam is specific to a given point (latitude, longitude) of the globe. The closer this point is to the poles, the more the shape of the cam is marked and the larger the reading error will be.
- the calculation of the shape of the cam must therefore take into account a corrective factor which furthermore varies as a function of the angular position of the cam.
- the gear ratio between the toothed sector of the rake and the drive wheel for the exact display of the information depends on the shape of the cam. In the context of displaying the time of sunrise or sunset, or in any other application where the shape of the cam is peculiar to a given point of the globe, changing the cam in order to display information relating to another latitude / longitude requires adapting the report of gear.
- this clock mechanism produces relatively high friction and pivoting clearance and requires the assembly of a large number of parts.
- two respective rakes and two respective return springs must be provided, as well as the rotation axes for the rakes.
- a first object of the present invention is to provide a clock mechanism for displaying information whose cam shape is easier to calculate and whose cams can be easily replaced by cams of different shape.
- a second object of the present invention is to provide such a clock mechanism that reduces friction and games and is easier to assemble.
- the present invention provides a clock mechanism for the information display comprising a first cam set in motion by a pivoting means, first elastic means maintaining a first follower member against the first cam, a first indicator drive wheel set in motion by the first follower member, a second cam set in motion by the pivoting means, second resilient means holding a second follower member against the second cam and a second indicator drive wheel set in motion by the second follower member, the first and second follower members being translationally guided, the first indicator driving wheel cooperating with a side face of the first follower member substantially parallel to its direction of travel, so as to allow the first cam to pivot the first indicator drive wheel through the first follower, the second indicator drive wheel cooperating with a face side of the second follower member substantially parallel to its direction of movement, so as to allow the second cam to rotate the second indicator drive wheel through the second follower member.
- the first and second follower members are guided in translation respectively by the first elastic means and by the second elastic means.
- the invention also relates to a watch having a watch mechanism as defined above.
- the attached figure is a plan view of a watch mechanism according to the invention, to indicate the sunrise and sunset times.
- the invention aims to provide a clock mechanism for the display of information at a dial of a watch, simple to design and assemble.
- FIG. 14 The figure illustrates a particular and non-limiting embodiment of a watch mechanism 20 according to the invention, allowing the display of the sunrise time at the dial of a watch.
- the power take off of the watch mechanism 20 is constituted by a pinion 22 meshing with a first wheel 24A.
- the first wheel 24A is rotatably mounted about a first pivot axis 26A, so as to allow the pinion 22 to cause the wheel 24A to pivot about the first pivot axis 26A.
- the first wheel 24A rotates at a rate of one revolution per year. It could nevertheless turn at another speed, for example a turn in two years.
- a first cam 28A is integral in rotation with the first wheel 24A.
- the position as well as the shape of the periphery of said cam 28A are chosen so as to describe a variation in the time of sunrise during the year. More specifically, the radius passing through the center and a side face 32A of the first cam 28A varies along its periphery. The periphery of the cam 28A is delimited by its lateral face 32A.
- 34A marking on the first cam 28A indicates the watchmaker angular position that should have the first cam 28A on January 1 of the year.
- the invention comprises a first longitudinal-shaped follower member 36A, one end 38A of which is in contact with the periphery of the first cam 28A.
- the first follower member 36A is connected to a first movable rigid portion 40A through two flexible blades 42A.
- the flexible blades 42A are substantially parallel to each other.
- the ends of the flexible blades 42A are joined to a first side face 44A of the first follower member 36A and a side face 46A of the first movable rigid portion 40A.
- the flexible blades 42A are configured to work in bending when the first cam 28A moves the first follower member 36A.
- the flexible blades 42A are arranged to maintain the end 38A of the first follower member 36A bears against the periphery of the first cam 28A, and limit the movement of the first follower member 36A by the first cam 28A to a movement translation substantially parallel to its longitudinal direction 52A.
- the first movable rigid portion 40A is also bonded to a base 48 through two flexible blades 42A, so as to form a flexible dual guide system of the first follower member 36A.
- the base 48 is intended to be fixed to a frame 49, typically the frame of the watch movement, and thus to be held fixed relative to the dial of the watch.
- a flexible double-guide system limits parasitic movement phenomena and allows the first follower member 36A to move in a pure translation.
- the flexible blades holding the first movable rigid portion 40A to the base 48 are similar to the flexible blades holding the first movable rigid portion 40A to the first follower member 36A. At rest, that is to say before the first follower member 36A is placed in cooperation with the first cam 28A, all the flexible blades 42A are straight and parallel to each other. The present invention does not exclude that the flexible blades 42A are, at rest, straight and non-parallel, or curved and parallel, or curved and non-parallel.
- the first follower member 36A comprises at a second side face 50A, opposite its first side face 44A and substantially parallel to its longitudinal direction 52A, a series of teeth 54A forming a rack. These teeth 54A cooperate with the toothing of a first indicator drive wheel 56A.
- the first indicator drive wheel 56A is rotatably mounted about a second pivot axis 58 parallel or substantially parallel to the first pivot axis 26A of the first wheel 24A.
- the first indicator drive wheel 56A carries a first indicator member 57A such as a first hand, so as to be able to indicate the time of the sunrise in cooperation with a graduation present on the dial of the watch.
- the pivoting of the first cam 28A by the first wheel 24A causes a rectilinear displacement of the first follower member 36A along its longitudinal direction 52A against an elastic return action exerted by the flexible blades 42A.
- the displacement of the first follower member 36A corresponds to the variation of the radius of the first cam 28A along its around, without reading error and without the shape of the first cam 28A needs to be corrected.
- a replacement of the first cam 28A by a cam of different shape is possible, to display the time of the sunrise at another point on the Earth, without having to change the gear ratio between the first follower member 36A and the first indicator drive wheel 56A.
- the flexible blades 42A more precisely the flexible guide system 40A, 42A, 48, fulfill the double function of guiding in translation the first follower member 36A and resiliently returning the first member follower 36A against the first cam 28A.
- No other translation guiding means than the system 40A, 42A, 48 is necessary and the friction between the first follower member 36A and the frame 49 can be eliminated or at least reduced. It also avoids any phenomenon of seizure or blocking of the first follower member 36A due to its guidance.
- the clock mechanism 20 is also configured to display the time of sunset.
- the power take-off of this mechanism is constituted by the pinion 22 mentioned above, which meshes with a second wheel 24B.
- the second wheel 24B is rotatably mounted about a pivot axis 26B parallel to the first pivot axis 26A, so as to allow the pinion 22 to cause the pivoting of said wheel 24B about said axis 26B.
- the second wheel 24B rotates at a rate of one turn per year. It could nevertheless turn at another speed, for example a turn in two years.
- a second cam 28B is integral in rotation with the second wheel 24B.
- the position as well as the shape of the periphery of said cam 28B are chosen so as to describe a variation in the time of sunset during the year. More specifically, the radius passing through the center and a side face 32B of the second cam 28B varies along its periphery. The periphery of the cam 28B is delimited by its lateral face 32B. 34B marking on the second cam 28B indicates the watchmaker angular position that should have second cam 28B on January 1 of the year.
- the invention comprises a second follower member 36B of longitudinal shape, one end 38B is in contact with the periphery of the second cam 28B.
- the second follower member 36B is connected to a second movable rigid portion 40B via two flexible blades 42B.
- the flexible blades 42B are substantially parallel to each other.
- the ends of the flexible blades 42B are joined to a first side face 44B of the second follower member 36B and a side face 46B of the second movable rigid portion 40B.
- the flexible blades 42B are configured to work in bending when the second cam 28B moves the second follower 36B. More specifically, the flexible blades 42B are arranged so as to maintain the end 38B of the second follower member 36B bears against the periphery of the second cam 28B, and limit the displacement of the second follower member 36B by the second cam 28B to a movement translation substantially parallel to its longitudinal direction 52B.
- the flexible blades 42B are substantially identical to the flexible blades 42A described above.
- the second movable rigid portion 40B is also bonded to the base 48 through two flexible blades 42B, so as to form a flexible dual guide system of the second follower member 36B.
- the second follower member 36B comprises at a second side face 50B, opposite its first side face 44B and substantially parallel to its longitudinal direction 52B, a series of teeth 54B forming a rack. These teeth 54B cooperate with a return wheel 60 driving a second indicator drive wheel 56B rotatably mounted about the second pivot axis 58 but free to rotate relative to the first indicator drive wheel 56A. It should be noted that only part of the second indicator drive wheel 56B is shown in the figure, to allow the reader to more easily view the cooperation between the first follower member 36A and the first drive wheel. 56A.
- the second indicator drive wheel 56B carries a second indicator member 57B, such as a second hand, so as to be able to indicate the time of sunset in cooperation with a graduation present on the dial of the watch.
- the idler wheel 60 because it drives the second indicator drive wheel 56B, is also an indicator drive wheel.
- the watch mechanism of the sunset time is simpler to design and more easily adaptable to other cam shapes, generates less friction and less play and is easier to assemble.
- the clock mechanism 20 with its two cams 28A, 28B and its two follower members 36A, 36B allows an accurate measurement of sunrise and sunset times, by making the measurement of the hours of sunrise independent of that of the hours of sunrise. sleep. This independence of the two measurements makes it possible to take into account the fact that the phenomena of sunrise and sunset are not perfectly symmetrical.
- the assembly comprising the follower members 36A, 36B, the flexible blades 42A, 42B, the rigid moving parts 40A, 40B and the base 48 is made integrally, for example by deep reactive ion etching (DRIE ) of silicon or any other suitable material, by LIGA (lithography, electro-plating, molding) of nickel, nickel-phosphorus or any other suitable material, or by electroerosion of steel (Durnico® or other) or any other suitable material, thereby reducing the number of parts and facilitating assembly.
- DRIE deep reactive ion etching
- the watch mechanism 20 advantageously comprises a cam 28A set in motion about a first pivot axis 26A by a pivoting means 22, elastic means 42A now an organ follower 36A against the cam 28A and an indicator drive wheel 56A mounted around a second pivot axis 58 and set in motion by the follower member 36A, the follower member 36A being guided in translation, the wheel 56A indicator drive cooperating with a side face 50A of the follower member 36A substantially parallel to its direction of movement 52A, so as to allow the cam 28A to rotate the indicator drive wheel 56A by the intermediate of the follower 36A to indicate information.
- the watch mechanism 20 also comprises another cam 28B set in motion by the pivoting means 22, other elastic means 42B holding another follower 36B against said other cam 28B, said other follower member 36B being guided in translation, and another indicator drive wheel 56B / 60 moved by said further follower 36B.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Electromechanical Clocks (AREA)
- Electric Clocks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18152022.2A EP3514633A1 (fr) | 2018-01-17 | 2018-01-17 | Mecanisme horloger pour l'affichage d'information |
| PCT/IB2019/050286 WO2019142090A1 (fr) | 2018-01-17 | 2019-01-15 | Mecanisme horloger pour l'affichage d'information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3740821A1 true EP3740821A1 (fr) | 2020-11-25 |
| EP3740821B1 EP3740821B1 (fr) | 2022-01-26 |
Family
ID=61002877
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18152022.2A Withdrawn EP3514633A1 (fr) | 2018-01-17 | 2018-01-17 | Mecanisme horloger pour l'affichage d'information |
| EP19704047.0A Active EP3740821B1 (fr) | 2018-01-17 | 2019-01-15 | Mécanisme horloger pour l'affichage d'information |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18152022.2A Withdrawn EP3514633A1 (fr) | 2018-01-17 | 2018-01-17 | Mecanisme horloger pour l'affichage d'information |
Country Status (2)
| Country | Link |
|---|---|
| EP (2) | EP3514633A1 (fr) |
| WO (1) | WO2019142090A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4202567A1 (fr) | 2021-12-22 | 2023-06-28 | Montres Breguet S.A. | Ensemble de guidages flexibles tête-bêche pour mouvement d'horlogerie, notamment pour un dispositif d'affichage |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH706767B1 (fr) * | 2012-07-27 | 2016-10-14 | Richemont Int Sa | Dispositif de commande pour mécanisme d'affichage rétrograde. |
| CH712096A2 (fr) * | 2016-02-04 | 2017-08-15 | Krayon Sàrl | Mouvement d'horlogerie à affichage d'informations astronomiques. |
| CH712374A1 (fr) * | 2016-04-19 | 2017-10-31 | Mft Et Fabrique De Montres Et Chronomètres Ulysse Nardin Le Locle S A | Dispositif d'affichage des heures de lever et de coucher du soleil. |
-
2018
- 2018-01-17 EP EP18152022.2A patent/EP3514633A1/fr not_active Withdrawn
-
2019
- 2019-01-15 WO PCT/IB2019/050286 patent/WO2019142090A1/fr not_active Ceased
- 2019-01-15 EP EP19704047.0A patent/EP3740821B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3514633A1 (fr) | 2019-07-24 |
| EP3740821B1 (fr) | 2022-01-26 |
| WO2019142090A1 (fr) | 2019-07-25 |
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