EP3330807B1 - Alternative display device - Google Patents
Alternative display device Download PDFInfo
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- EP3330807B1 EP3330807B1 EP17204571.8A EP17204571A EP3330807B1 EP 3330807 B1 EP3330807 B1 EP 3330807B1 EP 17204571 A EP17204571 A EP 17204571A EP 3330807 B1 EP3330807 B1 EP 3330807B1
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- European Patent Office
- Prior art keywords
- display device
- index
- disc
- toothing
- drive
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- 244000027321 Lychnis chalcedonica Species 0.000 description 8
- 239000003086 colorant Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- G04B19/06—Dials
- G04B19/16—Shiftable dials, e.g. indicating alternately from 1 to 12 and from 13 to 24
- G04B19/163—Shiftable dials, e.g. indicating alternately from 1 to 12 and from 13 to 24 numbers which are visible alternately from 1 to 12 and from 13 to 24 on the same dial G04B19/085
Definitions
- the present invention relates to the field of watchmaking. More particularly, it relates to a horological display device comprising a first set of indexes to designate twelve successive hours of a day and a second set of indexes to designate the others, as well as a drive mechanism which performs switching between these two sets in order to bring the appropriate set into an active position.
- the document DE513661 describes an alternative 1-12h/13-24h display device comprising an index disc carrying two sets of intersecting indexes, one comprising the digits 0/24 to 11, the other comprising the digits 12 to 23.
- This disc is located behind a dial with twelve apertures, and is rotated by a step of 15° clockwise around 12 o'clock and by a step of 15° counterclockwise at around midnight, under the control of a drive mechanism.
- the latter comprises a wheel making one revolution in 12 hours which drives a Maltese cross at the rate of two steps, that is to say half a turn, with each rotation of the wheel.
- This Maltese cross in turn drives a lever which is integral in rotation with the index disk in order to make it pivot and in order to reveal the appropriate index clearance behind the windows.
- the two-step rotation of the Maltese cross takes several hours, which results in the indexes not being correctly aligned for a long period around 0:00 and 12:00. Also, the drive system takes up a lot of space near the center of the movement, which is bulky and doesn't leave much room for other components.
- the document CH106257 describes a display device which is free from this drawback.
- This device has a pair of "instantaneous date" type drive systems, one acting to drive the index disc in the clockwise direction, the other to perform its drive counterclockwise.
- This arrangement has several drawbacks.
- the presence of two drive systems is complex and even requires more space in the plane of the movement than in the realization of the document DE513661 .
- the free space for other components is thus limited.
- the use of drive systems of the "instantaneous date” type is energy-intensive, since it requires a relatively high torque and the movement must load the two drive springs for a relatively long period, except when one of the springs is released to drive the disc. As the load on the going train varies, the isochronism of the timepiece is disturbed.
- the object of the present invention is thus to overcome the aforementioned drawbacks, and to propose a display device which performs the change from one set of indexes to another in a rapid manner, without being too bulky, nor consuming too much energy, nor cause too great a torque variation.
- the invention relates to a display device for a timepiece according to claim 1.
- This device comprises an index disk carrying a first set of indexes comprising indications corresponding to at least a part of twelve successive hours of a day as well as a second set of indexes comprising indications corresponding to at least part of the twelve other successive hours of the day, said sets of indexes being mutually intersected, that is to say that the indexes of one set alternate with those of the other.
- These indexes serve as indications of the time, and can be numbers, abstract signs, different colors, or other markings used to distinguish the two sets of hours.
- the successive twelve hours will be 1 a.m. to 12 p.m. and 1 p.m.
- the display device further comprises a device for driving said index disc, which is arranged to cause the latter to pivot at the rate of one step forward and one step back per day in order to sequentially bring the one then the other of said index sets in an active position.
- This pivoting typically takes place with one step around 12:00 p.m., and with the other step around 12:00 a.m.
- the active position can be defined, for example, by means of a mask or a dial comprising notches or apertures, or by any marking which suffices to indicate which game is active.
- the drive device further comprises an annular-shaped drive disc arranged to be continuously driven such that it rotates with a variable angular speed, said drive disc being arranged to reach a maximum speed when driving said index disc.
- This variable angular speed can, for example, comprise a sinusoidal component.
- control disc has a radial slot in which there is an eccentric pin carried by an intermediate wheel which is mounted on a support arranged to perform one revolution in 12 hours, said intermediate wheel meshing directly or indirectly with a fixed toothing .
- said intermediate wheel meshes with another intermediate wheel which in turn meshes with said fixed toothing.
- the manufacturer can thus easily determine the gear ratios so as to optimize the variations in angular speed of the control disk.
- said fixed toothing is a ring gear with internal toothing, which can be placed around the mechanism in order to take up little space in the center of the latter.
- said index disk has a radial slot in which an eccentric pin is placed, which is carried by a drive wheel arranged to be driven by said control disk.
- a simple drive system which is able to drive the index disk one step in one direction and then one step in the other direction is thus proposed.
- said drive wheel comprises a pinion with interrupted teeth, said pinion and said control disc being arranged to form a self-locking gear, which is therefore free of jumper for positioning the index disc.
- a training mobile can be swiveled rapidly through 180° with each drive, which results in a faster swiveling than, for example, a Maltese cross.
- a Maltese cross is also possible, subject to this reduced training speed.
- the invention relates to a timepiece comprising a display device as defined above.
- the figures 1 to 4 illustrate a display device 1 according to the invention at three stages of operation, in particular around 11:30 p.m. ( figure 1a , 2a , 3a and 4a ), 00:00 ( figure 1b , 2b , 3b and 4b ), and 00:30 ( figure 1c , 2c , 3c , 4c ).
- the display device 1 comprises a frame 3, which can be part of the frame or the middle part of the timepiece (not shown) in which the device 1 is integrated.
- This chassis 3 serves as a support for the components of the device 1.
- the display device 1 can be built as a separate module, and in such a case the chassis 3 is dedicated to this module and is intended to be fixed to the frame of a timepiece.
- index disc 5 of annular shape, is pivotally mounted in the device.
- This index disc 5 carries a first set of indexes 5a comprising the numbers 1 to 11, as well as a second set of indexes 5b comprising the numbers 13 to 23, the indexes of each set 5a, 5b being alternated in such so that the sequence 13 - 1 - 14 - 2 - 15 - 3 - 16 - 4 - 17 - 5 - 18 - 6 - 19 - 7 - 20 - 8 - 21 - 9 - 22 - 10 - 23 - 11 is written in clockwise on the index disk 5.
- These indexes serve as indications of the time.
- a mask 7 (represented exclusively on the figures 1a-1c ), which is also annular in shape, and which comprises a plurality of notches 7a which define active positions for the numbers inscribed on the index disk 5.
- a set of indexes 5a, 5b is below these notches, it is visible to the user, and the corresponding index set 5a, 5b is considered to be in the active position.
- the mask may comprise apertures instead of notches, or the active positions may be indicated otherwise, for example by appropriate markings on a transparent element, on the glass of the watch, on the periphery of the chassis 3, or the like. . In the latter cases, the mask can be omitted.
- the hours are indicated by an indicator member 9, represented in the form of an arrow carried by a support 11a, 11b which comprises a base plate 11b and an upper ring 11a, this support 11a, 11b being mounted in rotation around the center of the display device 1 and concentrically to the index disk 5.
- the support 11a, 11b is driven in rotation by a driving source (not shown), which can be mechanical or electrical, at the rate of one revolution in twelve hours.
- a driving source not shown
- the base plate 11b is illustrated here as being a solid disc, it can also be annular in order to free up space in the center of the display device for other components, other organs of indication etc.
- the index disc 5 is driven from this support 11, via a drive device 13, which forms a kinematic connection between these two components.
- a first intermediate wheel 15 is rotatably mounted on the support 11.
- This wheel 15 meshes with a fixed toothing 17, integral with the frame 3 and hidden by the mask 7, as well as with a second intermediate wheel 19, also pivoted on the support 11.
- This second intermediate wheel 19 carries an eccentric pin 19a which takes place in a radial slot 21a of an annular control disc 21.
- the size and the number of teeth of the intermediate wheels 15, 17 can be chosen according to the needs of the manufacturer; it should be noted in particular that the intermediate wheel 15 can be of a smaller size than that illustrated here, in order to free the center of the device 1.
- the first intermediate wheel 15 could be replaced by at least one mobile, in order to further modify the speed of rotation of the second intermediate wheel 19.
- control disc 21 includes a notch 21c in its inner periphery in order to allow the axis of the intermediate wheel 15 to pass.
- the pin 19a rotates the control disk 21, and imposes a variable angular speed on it.
- This variable speed represents the sum of the angular speed of the support 11 and of a component resulting from the rotation of the second intermediate wheel 19 around its own axis. Indeed, when the pin 19a advances the control disc 21 relative to the support 11, the control disc pivots with an angular speed greater than that of the support 11. In the same way, when the pin 19a moves the control 21 relative to support 11, its angular speed is lower than that of support 11.
- this average value is equal to the angular speed of the support 11.
- this average value is superimposed a sinusoidal variation, which is determined to present a maximum during the index disc drive 5.
- an integer number of cycles of this sinusoidal variation are included in the cycle of one complete revolution of the control disc 21.
- This driving of the index disk 5 is effected by means of a short toothing 23, which interacts with a driving wheel set 25 pivotally mounted on the frame 3.
- the wheel set training is at 12 o'clock, but this is not compulsory. Indeed, the manufacturer can determine its position according to its needs, and/or according to the sequences of successive hours to be distinguished.
- this drive wheel set 25 comprises a pinion with interrupted teeth 25a, which performs a half-turn by passage of the short toothing 23.
- the short toothing does not interact with the pinion 25a, the latter cooperates with a surface devoid of teeth 21b that includes the control disc 21, self-locking manner.
- the tops of the teeth project beyond this surface 21b, and the bottoms of these teeth describe a radius less than that of the surface 21b.
- This kind of gear avoids the use of a jumper to position the index disc 5, which has the effect of minimizing energy consumption.
- This pin 25b takes place in a radial slot 5c that comprises the index disc 5.
- this slot 5c is hidden by the part of the mask 7 which corresponds to the 12 o'clock/00 o'clock position.
- the pin 25b is halfway in the slot 5c (see the figure 2a and 2c ), and holds the index disk 5 in position, as shown in the figure 1a , 2a and 3a .
- mobile 25 When mobile 25 is driven by control disc 21, mobile 25 performs a step of half a turn in the counterclockwise direction (considered on the dial side).
- the pin 25b passing through one of the ends of the slot 25b, therefore drives the slot 5c so as to cause the index disk 5 to pivot towards its other stable position.
- the figures 1 to 4 therefore illustrate the sequence of operations which rotates the index disc 5 by one step counterclockwise around 00:00, in order to bring the first set of indexes 5a into its active position.
- the mobile 25 performs another half-turn counterclockwise, and the pin 25b drives the index disk 5 by one step clockwise, in order to bring the second set of indexes 5b in said active position.
- the switching of the index disk 5 is done independently of the direction of rotation of the support 11, which is practical in the event of setting the time.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromechanical Clocks (AREA)
Description
La présente invention se rapporte au domaine de l'horlogerie. Plus particulièrement, elle porte sur un dispositif d'affichage horloger comprenant un premier jeu d'index pour désigner douze heures successives d'une journée et un second jeu d'index pour désigner les autres, ainsi qu'un mécanisme d'entraînement qui effectue une commutation entre ces deux jeux afin d'amener le jeu approprié dans une position active.The present invention relates to the field of watchmaking. More particularly, it relates to a horological display device comprising a first set of indexes to designate twelve successive hours of a day and a second set of indexes to designate the others, as well as a drive mechanism which performs switching between these two sets in order to bring the appropriate set into an active position.
Le document
Cependant, le pivotement de deux pas de la croix de Malte dure plusieurs heures, ce qui a pour résultat que les index ne sont pas correctement alignées pendant une période longue aux alentours de 0h00 et 12h00. Par ailleurs, le système d'entraînement occupe beaucoup de place près du centre du mouvement, ce qui est encombrant et ne laisse pas beaucoup de place pour d'autres composants.However, the two-step rotation of the Maltese cross takes several hours, which results in the indexes not being correctly aligned for a long period around 0:00 and 12:00. Also, the drive system takes up a lot of space near the center of the movement, which is bulky and doesn't leave much room for other components.
Le document
D'autres systèmes similaires ont été dévoilés dans les documents
Le but de la présente invention est ainsi de surmonter les inconvénients susmentionnés, et de proposer un dispositif d'affichage qui effectue le changement d'un jeu d'index à l'autre d'une façon rapide, sans être trop encombrant, ni consommer trop d'énergie, ni engendrer une variation de couple trop importante.The object of the present invention is thus to overcome the aforementioned drawbacks, and to propose a display device which performs the change from one set of indexes to another in a rapid manner, without being too bulky, nor consuming too much energy, nor cause too great a torque variation.
De façon plus précise, l'invention concerne un dispositif d'affichage pour pièce d'horlogerie selon la revendication 1. Ce dispositif comprend un disque d'index portant un premier jeu d'index comprenant des indications correspondant à au moins une partie de douze heures successives d'une journée ainsi qu'un deuxième jeu d'index comprenant des indications correspondant à au moins une partie des douze autres heures successives de la journée, lesdits jeux d'index étant mutuellement entrecroisés, c'est-à-dire que les index d'un jeu s'alternent avec ceux de l'autre. Ces index servent en tant qu'indications de l'heure, et peuvent être aussi bien des chiffres, des signes abstraits, des couleurs différentes, ou d'autres marquages servant à distinguer les deux jeux d'heures. Typiquement, les douze heures successives seront 1h à 12h et 13h à 24h, mais d'autres ensembles d'heures sont également possibles, tels que les heures de la nuit et de la journée (par exemple 18h à 5h respectivement 6h à 17h), ou tout autre division des 24 heures d'un jour.More specifically, the invention relates to a display device for a timepiece according to
Le dispositif d'affichage comprend en outre un dispositif d'entraînement dudit disque d'index, qui est agencé pour faire pivoter ce dernier à raison d'un pas en avant et d'un pas en arrière par jour afin d'amener séquentiellement l'un puis l'autre desdits jeux d'index dans une position active. Ce pivotement s'effectue typiquement d'un pas aux alentours de 12h00, et de l'autre pas aux alentours de 00h00. La position active peut être définie, par exemple, par l'intermédiaire d'un masque ou d'un cadran comportant des encoches ou des guichets, ou par un marquage quelconque qui suffit d'indiquer quel jeu est actif.The display device further comprises a device for driving said index disc, which is arranged to cause the latter to pivot at the rate of one step forward and one step back per day in order to sequentially bring the one then the other of said index sets in an active position. This pivoting typically takes place with one step around 12:00 p.m., and with the other step around 12:00 a.m. The active position can be defined, for example, by means of a mask or a dial comprising notches or apertures, or by any marking which suffices to indicate which game is active.
Selon l'invention, le dispositif d'entraînement comprend en outre un disque de commande de forme annulaire agencé pour être entraîné en permanence de telle sorte qu'il tourne avec une vitesse angulaire variable, ledit disque de commande étant agencé pour atteindre une vitesse maximum lors de l'entraînement dudit disque d'index. Cette vitesse angulaire variable peut, par exemple, comprendre une composante sinusoïdale.According to the invention, the drive device further comprises an annular-shaped drive disc arranged to be continuously driven such that it rotates with a variable angular speed, said drive disc being arranged to reach a maximum speed when driving said index disc. This variable angular speed can, for example, comprise a sinusoidal component.
Pour le surplus, ledit disque de commande comporte une fente radiale dans laquelle se trouve une goupille excentrique portée par une roue intermédiaire qui est montée sur un support agencé pour effectuer un tour en 12 heures, ladite roue intermédiaire engrenant directement ou indirectement avec une denture fixe.Furthermore, said control disc has a radial slot in which there is an eccentric pin carried by an intermediate wheel which is mounted on a support arranged to perform one revolution in 12 hours, said intermediate wheel meshing directly or indirectly with a fixed toothing .
Ce faisant, le pivotement du disque d'index peut s'effectuer rapidement, sans devoir charger un ressort. Par conséquent, aucune charge significative n'est imposée sur le rouage de finissage, et les variations de couple sont minimisées. Ce dernier avantage découle du fait que le disque de commande est entraîné en permanence par le mouvement de base au lieu d'être entraîné premièrement par le mouvement, puis par un ressort, et puis d'être effectivement découplé du mouvement jusqu'au moment où la roue menante le rattrape, comme c'est le cas dans le dispositif du document
Avantageusement, ladite roue intermédiaire engrène avec une autre roue intermédiaire qui engrène à son tour avec ladite denture fixe. Le constructeur peut ainsi aisément déterminer les rapports d'engrenage de façon à optimiser les variations de vitesse angulaire du disque de commande.Advantageously, said intermediate wheel meshes with another intermediate wheel which in turn meshes with said fixed toothing. The manufacturer can thus easily determine the gear ratios so as to optimize the variations in angular speed of the control disk.
Avantageusement, ladite denture fixe est une couronne à denture intérieure, qui peut être placée autour du mécanisme afin d'être peu encombrante au centre de ce dernier.Advantageously, said fixed toothing is a ring gear with internal toothing, which can be placed around the mechanism in order to take up little space in the center of the latter.
Avantageusement, ledit disque d'index comporte une fente radiale dans laquelle prend place une goupille excentrique, qui est portée par un mobile d'entraînement agencé pour être entraîné par ledit disque de commande. Un système d'entraînement simple, qui est apte à entraîner le disque d'index d'un pas dans un sens et puis d'un pas dans l'autre sens est ainsi proposé.Advantageously, said index disk has a radial slot in which an eccentric pin is placed, which is carried by a drive wheel arranged to be driven by said control disk. A simple drive system, which is able to drive the index disk one step in one direction and then one step in the other direction is thus proposed.
Avantageusement, ledit mobile d'entraînement comporte un pignon à denture interrompue, ledit pignon et ledit disque de commande étant agencés pour former un engrenage autobloquant, qui est donc exempt de sautoir pour positionner le disque d'index. Un tel mobile d'entraînement peut être pivoté rapidement de 180° à chaque entraînement, ce qui résulte dans un pivotement plus rapide que, par exemple, une croix de Malte. Cependant, l'utilisation d'une croix de Malte est également possible, sous réserve de cette vitesse d'entraînement réduite.Advantageously, said drive wheel comprises a pinion with interrupted teeth, said pinion and said control disc being arranged to form a self-locking gear, which is therefore free of jumper for positioning the index disc. Such a training mobile can be swiveled rapidly through 180° with each drive, which results in a faster swiveling than, for example, a Maltese cross. However, the use of a Maltese cross is also possible, subject to this reduced training speed.
Finalement, l'invention porte sur une pièce d'horlogerie comprenant un dispositif d'affichage comme défini précédemment.Finally, the invention relates to a timepiece comprising a display device as defined above.
D'autres détails de l'invention apparaîtront plus clairement à la lecture de la description qui suit, faite en référence aux dessins annexés dans lesquels :
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Fig. 1a - 1c sont des vues schématiques isométriques d'un dispositif d'affichage selon l'invention, vu du côté cadran, et selon trois phases d'opération (23h30, 00h00 et 00h30 respectivement) ; -
Fig. 2a - 2c sont des vues schématiques isométriques d'un dispositif d'affichage selon l'invention, sans masque, vu du côté cadran, et selon les trois mêmes phases d'opération ; -
Fig. 3a - 3c sont des vues schématiques isométriques d'un dispositif d'affichage selon l'invention, sans masque et sans la partie supérieure du support, vu du côté cadran, et selon les trois mêmes phases d'opération ; et -
Fig. 4a - 4c sont des vues schématiques isométriques d'un dispositif d'affichage selon l'invention, vu du côté fond, et selon les trois mêmes phases d'opération.
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Fig. 1a - 1c are schematic isometric views of a display device according to the invention, seen from the dial side, and according to three operating phases (11:30 p.m., 12:00 a.m. and 12:30 a.m. respectively); -
Fig. 2a - 2c are schematic isometric views of a display device according to the invention, without mask, seen from the dial side, and according to the same three phases of operation; -
Fig. 3a - 3c are schematic isometric views of a display device according to the invention, without mask and without the upper part of the support, seen from the dial side, and according to the same three phases of operation; and -
Fig. 4a - 4c are schematic isometric views of a display device according to the invention, seen from the bottom side, and according to the same three operating phases.
Les
Le dispositif d'affichage 1 comprend un châssis 3, qui peut faire partie du bâti ou de la carrure de la pièce d'horlogerie (non illustrée) dans laquelle le dispositif 1 est intégré. Ce châssis 3 sert de support pour les composants du dispositif 1. Alternativement, le dispositif d'affichage 1 peut être construit en tant que module séparé, et dans un tel cas le châssis 3 est dédié à ce module et est destiné à être fixé au bâti d'une pièce d'horlogerie.The
Un disque d'index 5, de forme annulaire, est monté en pivotement dans le dispositif. Ce disque d'index 5 porte un premier jeu d'index 5a comprenant les chiffres 1 à 11, ainsi qu'un second jeu d'index 5b comprenant les chiffres 13 à 23, les index de chaque jeu 5a, 5b étant alternés de telle sorte que la séquence 13 - 1 - 14 - 2 - 15 - 3 - 16 - 4 - 17 - 5 - 18 - 6 - 19 - 7 - 20 - 8 - 21 - 9 - 22 - 10 - 23 - 11 est inscrite dans le sens horaire sur le disque d'index 5. Ces index servent d'indications de l'heure. Il est également possible de prévoir des chiffres représentant 12h00 et 24h00/00h00, mais ces index ont été omis dans la variante illustrée, ou d'utiliser d'autres séquences de chiffres (par exemple une séquence d'heures représentant au moins une partie de la nuit, et une autre séquence représentant au moins une partie de la journée). Alternativement, des signes abstraits, des couleurs ou similaires peuvent être utilisés au lieu de chiffres.An
Superposé au disque d'index 5 se trouve un masque 7 (représenté exclusivement sur les
Alternativement, le masque peut comprendre des guichets au lieu d'encoches, ou les positions actives peuvent être indiquées autrement, par exemple par des marquages appropriés sur un élément transparent, sur le verre de la montre, sur le pourtour du châssis 3, ou similaire. Dans ces derniers cas, le masque peut être omis.Alternatively, the mask may comprise apertures instead of notches, or the active positions may be indicated otherwise, for example by appropriate markings on a transparent element, on the glass of the watch, on the periphery of the
Les heures sont indiquées par un organe d'indication 9, représenté sous forme de flèche portée par un support 11a, 11b qui comporte une planche de base 11b et un anneau supérieur 11a, ce support 11a, 11b étant monté en rotation autour du centre du dispositif d'affichage 1 et concentriquement au disque d'index 5. Le support 11a, 11b est entraîné en rotation par une source motrice (non-illustrée), qui peut être mécanique ou électrique, à raison d'un tour en douze heures. Il faut noter que, bien que la planche de base 11b est illustrée ici comme étant un disque plein, elle peut également être annulaire afin de libérer de la place au centre du dispositif d'affichage pour d'autres composants, d'autres organes d'indication etc.The hours are indicated by an
Le disque des index 5 est entraîné depuis ce support 11, par l'intermédiaire d'un dispositif d'entraînement 13, qui fait une liaison cinématique entre ces deux composants.The
À cet effet, une première roue intermédiaire 15 est montée en rotation sur le support 11. Cette roue 15 engrène avec une denture fixe 17, solidaire du châssis 3 et cachée par le masque 7, ainsi qu'avec une deuxième roue intermédiaire 19, également pivotée sur le support 11. Cette deuxième roue intermédiaire 19 porte une goupille excentrique 19a qui prend place dans une fente radiale 21a d'un disque de commande 21 annulaire. La taille et le nombre de dents des roues intermédiaires 15, 17 peuvent être choisis selon les besoins du constructeur ; il faut noter en particulier que la roue intermédiaire 15 peut être de taille inférieure à celle illustrée ici, afin de libérer le centre du dispositif 1. Alternativement, la première roue intermédiaire 15 pourrait être remplacée par au moins un mobile, afin de modifier davantage la vitesse de rotation de la deuxième roue intermédiaire 19.To this end, a first
Par ailleurs, dans la variante illustrée, le disque de commande 21 comporte une encoche 21c dans son pourtour intérieur afin de permettre à l'axe de la roue intermédiaire 15 de passer.Furthermore, in the variant illustrated, the
La goupille 19a entraîne en rotation le disque de commande 21, et lui impose une vitesse angulaire variable. Cette vitesse variable représente la somme de la vitesse angulaire du support 11 et d'une composante découlant de la rotation de la deuxième roue intermédiaire 19 autour de son propre axe. En effet, lorsque la goupille 19a fait avancer le disque de commande 21 par rapport au support 11, le disque de commande pivote avec une vitesse angulaire supérieure à celle du support 11. De la même façon, lorsque la goupille 19a fait reculer le disque de commande 21 par rapport au support 11, sa vitesse angulaire est inférieure à celle du support 11.The
En moyennant la vitesse angulaire du disque de commande 21 sur un tour, cette valeur moyenne est égale à la vitesse angulaire du support 11. Mais, sur cette valeur moyenne se superpose une variation sinusoïdale, qui est déterminée pour présenter un maximum lors de l'entraînement du disque des index 5. Afin d'atteindre la vitesse maximale au bon moment dans le cycle de fonctionnement, un nombre entier de cycles de cette variation sinusoïdal s'inscrivent dans le cycle d'un tour complet du disque de commande 21.By averaging the angular speed of the
Cet entraînement du disque des index 5 s'effectue par le biais d'une courte denture 23, qui interagit avec un mobile d'entraînement 25 monté pivotant sur le châssis 3. Dans la variante illustrée, le mobile d'entraînement se situe à 12h, mais ceci n'est pas obligatoire. En effet, le constructeur peut déterminer sa position selon ses besoins, et/ou selon les séquences d'heures successives à distinguer.This driving of the
Côté fond, ce mobile d'entraînement 25 comporte un pignon à denture interrompue 25a, qui effectue un demi-tour par passage de la courte denture 23. Lorsque la courte denture n'interagit pas avec le pignon 25a, ce dernier coopère avec une surface dépourvue de denture 21b que comporte le disque de commande 21, de manière autobloquante. À ce titre, les sommets des dents projettent au-delà de cette surface 21b, et les fonds de ces dents décrivent un rayon inférieur à celui de la surface 21b.On the bottom side, this drive wheel set 25 comprises a pinion with interrupted
Ce genre d'engrenage évite l'utilisation d'un sautoir pour positionner le disque d'index 5, ce qui a pour effet une minimisation de la consommation d'énergie.This kind of gear avoids the use of a jumper to position the
Côté cadran du mobile 25 se trouve une goupille excentrique 25b portée par un disque qui est solidaire en rotation du pignon 25a. Ce disque est à peine visible sur les figures, donc aucun signe de référence ne lui a été attribué.On the dial side of mobile 25 there is an
Cette goupille 25b prend place dans une fente radiale 5c que comporte le disque d'index 5. Dans la variante illustrée, cette fente 5c est cachée par la partie du masque 7 qui correspond à la position 12h/00h.This
Lorsque le disque d'index 5 se trouve dans l'une de ses deux positions stables, la goupille 25b se trouve à mi-chemin dans la fente 5c (voir les
Lors d'un entraînement du mobile 25 par le disque de commande 21, le mobile 25 effectue un pas d'un demi-tour dans le sens antihoraire (considéré côté cadran). La goupille 25b, passant par l'une des extrémités de la fente 25b, entraîne par conséquent la fente 5c de manière à faire pivoter le disque d'index 5 vers son autre position stable.When mobile 25 is driven by
En considérant cette géométrie, il est clair que le mobile 25 portant la goupille 25b effectue un demi-tour à chaque entraînement par la courte denture 23. L'utilisation d'une croix de Malte et d'un doigt au lieu du pignon 25a et de la denture 23, bien que possible, est en revanche désavantageux. Afin d'effectuer un demi-tour, une croix de Malte doit être entraînée de deux pas de 90°, tandis que le pignon 25a ne peut effectuer qu'un seul pas de 180°. L'entraînement du disque d'index 5 sera par conséquent significativement plus lent pour une croix de Malte que pour l'agencement illustré dans les figures.Considering this geometry, it is clear that the mobile 25 carrying the
Les
Bien que l'invention ait été décrite ci-dessus en lien avec un mode de réalisation spécifique, des variantes supplémentaires sont également envisageables sans sortir de la portée de l'invention comme définie par les revendications.Although the invention has been described above in connection with a specific embodiment, additional variants are also possible without departing from the scope of the invention as defined by the claims.
Claims (7)
- Display device (1) for a timepiece, comprising:- an index disc (5) bearing a first index set (5a) comprising indications corresponding to at least a part of twelve successive hours of a day and a second index set (5b) comprising indications corresponding to at least a part of the twelve other successive hours of the day, said index sets (5a, 5b) being mutually interlaced,- a drive device (13) of said index disc (5) arranged to make it pivot at a rate of one step forward and one step backward per day in order to sequentially bring one and then the other of said index sets (5a, 5b) into an active position;said drive device (13) comprising a control disc (21) of annular form arranged to be driven permanently such that it pivots with a variable angular speed, said control disc (21) being arranged to reach a maximum speed during the driving of said index disc (5),said control disc (21) comprising a radial slit (21a) in which is situated an eccentric pin (19a) borne by an intermediate wheel (19) which is mounted on a support (11a, 11b) arranged to perform one revolution in twelve hours, said intermediate wheel (19) meshing directly or indirectly with a fixed toothing (17).
- Display device (1) according to Claim 1, wherein said angular speed comprises a sinusoidal component.
- Display device (1) according to one of Claims 1 and 2, wherein said intermediate wheel (19) meshes with another intermediate wheel (15) which in turn meshes with said fixed toothing (17).
- Display device (1) according to one of Claims 1 to 3, wherein said fixed toothing (17) is a crown with internal toothing.
- Display device (1) according to one of Claims 1 to 4, wherein said index disc (5) comprises a radial slit (5c) in which is situated an eccentric pin (25b) borne by a drive wheel (25) arranged to be driven by said control disc (21).
- Display device (1) according to Claim 5, wherein said drive wheel (25) comprises a pinion with interrupted toothing (25a), said pinion (25a) and said control disc (21) being arranged to form a self-locking gear.
- Timepiece comprising a display device (1) according to one of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH001581/2016A CH713193B1 (en) | 2016-12-02 | 2016-12-02 | Alternative display device for timepiece. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3330807A1 EP3330807A1 (en) | 2018-06-06 |
EP3330807B1 true EP3330807B1 (en) | 2022-05-04 |
Family
ID=60515262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17204571.8A Active EP3330807B1 (en) | 2016-12-02 | 2017-11-30 | Alternative display device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3330807B1 (en) |
CH (1) | CH713193B1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH59451A (en) * | 1912-04-09 | 1913-05-16 | Gaspar Roth & Cie | Mechanism adaptable to a timepiece to automatically and alternately indicate the hours from midnight to noon, then from noon to midnight |
DE485116C (en) * | 1928-04-19 | 1929-10-26 | Max Ilga | Change mechanism for 24-hour clocks |
-
2016
- 2016-12-02 CH CH001581/2016A patent/CH713193B1/en unknown
-
2017
- 2017-11-30 EP EP17204571.8A patent/EP3330807B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
CH713193A2 (en) | 2018-06-15 |
EP3330807A1 (en) | 2018-06-06 |
CH713193B1 (en) | 2023-10-31 |
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