EP3811157B1 - Digital display for a timepiece - Google Patents

Digital display for a timepiece Download PDF

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Publication number
EP3811157B1
EP3811157B1 EP19744848.3A EP19744848A EP3811157B1 EP 3811157 B1 EP3811157 B1 EP 3811157B1 EP 19744848 A EP19744848 A EP 19744848A EP 3811157 B1 EP3811157 B1 EP 3811157B1
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EP
European Patent Office
Prior art keywords
disc
figures
indicator
digital display
borne
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EP19744848.3A
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German (de)
French (fr)
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EP3811157A1 (en
Inventor
Pascal HUMAIR
Julien Giacobino
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Patek Philippe SA Geneve
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Patek Philippe SA Geneve
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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
    • G04B19/00—Indicating the time by visual means
    • G04B19/20—Indicating by numbered bands, drums, discs, or sheets
    • G04B19/202—Indicating by numbered bands, drums, discs, or sheets by means of turning discs

Definitions

  • the present invention relates to a digital display for a timepiece comprising a first indicator disk and a second indicator disk each carrying a series of numbers or pairs of numbers regularly distributed over a peripheral ring so as to form at least one ordered sequence, the two indicator discs being arranged so as to selectively present one of the digits or pairs of digits carried by the first indicator disc in association with one of the digits or pairs of digits carried by the second indicator disc, the digital display further comprising a mechanism for driving the second indicator disc by the first indicator disc, the drive mechanism comprising teeth integral with the second indicator disc, the teeth comprising one tooth for each digit or pair of digits carried by the second indicator disc, and at least one finger secured to the first indicator disc, the finger being arranged to engage with a tooth of the second indicator disc so as to increment the latter by one step once per revolution.
  • the invention also relates to a timepiece comprising a digital display conforming to the definition above.
  • the document EP 2 113 817 A1 describes a digital display for a chronograph hour counter.
  • the digital display comprises a first display mobile and a second display mobile.
  • the digital display also includes a mechanism for driving the second mobile by the first mobile.
  • the first mobile is formed of a stack comprising in particular a disk for displaying the hour units, a star with 10 teeth, and a stopping finger comprising a blocking surface forming a portion of a circle and a lug.
  • the second display mobile for its part, is formed of a stack including in particular a tens of hours display disc, a Maltese cross with ten branches and ten notches.
  • An aim of the present invention is to remedy the disadvantages of the prior art which have just been explained.
  • the present invention achieves this and other goals by providing a digital display according to appended claim 1.
  • the mechanism for driving the second disk by the first disk is of the Maltese cross type.
  • a Maltese cross type drive mechanism is a mechanical device making it possible to transform a continuous rotational movement into a jerky rotation.
  • the appendix shows a Maltese cross drive mechanism of classical design. The operation of the driving mechanism shown is as follows: a driving mobile 21, which comprises a profiled cam 23 in the shape of an incomplete cylindrical and a lug 25, rotates continuously.
  • the driven mobile (in other words the Maltese cross) 27 has four branches (or teeth).
  • the lug 25 enters the space (or groove) between two branches and rotates the Maltese cross 27 by a 1 ⁇ 4 turn.
  • the leading mobile 21 does not stop rotating so that the lug 25 comes out of the groove.
  • the Maltese cross 27 is then immobilized by the cooperation of the concave top of one of its branches with the cylindrical part of the profiled cam 23.
  • the shape of the cylindrical part of the profiled cam 23 is complementary to the concave shape from the top of the branches of the Maltese cross 27, so that the profiled cam 23 maintains the Maltese cross 27 in an indexed position during periods when the lug 25 is not engaged in one of the grooves.
  • the teeth of the teeth which are secured to the second indicator disc have a truncated shape with a concave top.
  • the digital display includes a cam which is secured to the first indicator disc in a coaxial position.
  • the cam is circular in shape except in the vicinity of each of said at least one finger, where the generally round shape gives way to a recessed cutout.
  • the circular profile of the cam is complementary to the concave profile of the top of the teeth of the second indicator disc.
  • the mechanism for driving the second indicator disk by the first indicator disk maintains the second indicator disk in an indexed position during periods when none of said at least one finger is engaged in the teeth of the second disk indicator.
  • the second indicator disc and the teeth are arranged on one and the same level, said truncated teeth projecting from the circumference of the second indicator disk, the profile of the cam and said at least one finger constituting the outer edge of the first indicator disk.
  • the digital display for a timepiece of the invention lends itself to many applications: digital indication of the current time (hour and minutes); calendar ; decimal counter linked to a non-timely function (golf counter for example); etc.
  • FIG. 1 is a plan view on the dial side of a wristwatch which comprises an alarm mechanism with means for indicating the alarm time, the latter comprising a digital display conforming to a particular embodiment of the invention .
  • the watch of the figure 1 includes a winding and time-setting crown (referenced 11) which protrudes from the middle of the watch at 4 o'clock. When crown 11 is in the first pulled out position, it allows you to shift the alarm time in one direction or the other by rotating the crown.
  • the wristwatch also has a digital display designed to indicate the alarm time. This display conforms to a particular embodiment of the invention.
  • the digital display is arranged to indicate the alarm time through two windows (referenced 3 and 5) which are arranged side by side in dial 7 at twelve o'clock.
  • a first of the two windows (referenced 3) indicates the hour in the form of an integer between 1 and 12, and the second window (referenced 5) indicates the minute in the form of a two-digit number.
  • a third small window (referenced 9) is placed between the first two windows 3 and 5 and the center of the dial.
  • the indicator which appears in the small window 9 is a day/night indicator associated with the alarm time.
  • the display shown comprises two discs arranged side by side, a minutes disc 31 which carries twelve two-digit numbers between 00 and 55 and an hours disc 33 which carries the whole numbers from 01 to 12. It will be noted that, so equivalent, a blank space could replace the zero when the latter is on the left in a pair of digits.
  • the two disks 31, 33 have the same diameter in the example illustrated, it will be understood that they could have different diameters. Conventionally, the two disks 31, 33 are arranged under the dial 7 ( figure 1 ) so that only the two numbers which occupy the positions directly opposite each other are visible through the two apertures 3, 5, as shown in figures 1 And 3 .
  • the wearer of the wristwatch of the present example can activate the minute disc 31 in rotation, in one direction or the other, using the winding crown and time setting 11 ( figure 1 ).
  • the display shown comprises a mechanism for driving the hour disk by the minute disk.
  • the minute disc 31 carries a lug (or finger) 35 which projects radially from its periphery, and the hour disc 33 carries twelve truncated teeth 37 which are regularly spaced along its circumference.
  • the display in this example is designed to take up as little space as possible in height.
  • the teeth 37 and the disc 33 to which they are integral are arranged on one and the same level, the truncated teeth 37 thus projecting from the circumference of the disc 33.
  • the teeth 37 could alternatively constitute the teeth of a star arranged coaxially under the hour disc.
  • the minute disc 31 would preferably be thicker, so that the numbers it carries can be at the same level as the numbers carried by the hour disc, while allowing the lug 35 to be at the same level as teeth 37.
  • the outer edge of the minute disc 31 is formed by an annular zone 39 with a cylindrical outer edge which extends along most of the circumference of the disc 31.
  • the figure 2 also shows that the twelve truncated teeth 37 each have a concave rounded top, the curvature of the rounding being complementary to the curvature of the cylindrical outer edge of the annular zone 39.
  • the distance between the minute disc and that of the hours is chosen so that the convex cylindrical edge of the minute disc 31 can fit into the concave rounding presented by the top of a tooth 37.
  • the minute disc 31 functions in the manner of a profiled cam in the shape of an incomplete cylinder, the hour disc 33 being held immobilized while the cam with a cylindrical profile rotates around its axis.
  • the annular zone 39 extends along the entire circumference of the disc 31 with the exception of an interruption at the level of the lug 35.
  • the two ends of the annular zone 39, on either side of the lug 35 each have a gently sloping chamfer shape, and that the two chamfers which face each other together define a cut in hollow from the bottom of which the lug 35 projects.
  • the recessed cutout has a symmetrical shape centered on the lug.
  • the mechanism for driving the hour disc 33 by the minute disc 31 maintains the hour disc 33 in an indexed position during periods when the lug 35 is not engaged in the space between two teeth 37. It is therefore not necessary to provide a jumper spring to ensure the indexing of the hour disc 33.
  • the digital display comprises two jumper springs 41a and 41b respectively arranged so as to index the minutes disk 31 and the hours disk 33. Thanks to these two springs, it is in fact possible to angularly position the minute disc 31 and the hour disc 33 with better precision than that offered by the nesting of the cylindrical edge of the minute disc in the concave rounding of a tooth 37 of the hour disc . It will be understood that, in the example illustrated, it is indeed the mechanism for driving the hours disk by the minutes disk which ensures that the two disks do not become desynchronized in the event of shocks.
  • the jumper springs only ensure fine positioning. These do not need to be able to withstand shocks. We can therefore use jump springs that are weaker than those used in the prior art.
  • FIG. 6 is a top plan view of a digital hour and minute display, which conforms to a second particular embodiment of the invention.
  • the first and the second embodiment have a large number of characteristics in common. This is why the elements of the display of the Figure 6 which are identical or equivalent to elements represented in the figure 2 are designated in the Figure 6 by the same reference numbers increased by 100.
  • the display of the Figure 6 features a 131 minute disc and a 133 hour disc arranged side by side.
  • the hours disc carries the sequence of integers from 01 to 12 which are regularly distributed along its circumference.
  • the main difference between the display of the Figure 6 and that of the figure 2 concerns the minutes disc.
  • disk 131 is designed to display the minutes from 10 to 10.
  • the twelve numbers it carries, regularly distributed over a peripheral ring are made up of two series of six multiples of 10 ordered from 00 to 50 .
  • the display of the Figure 6 also includes a mechanism for driving the hours disk 133 by the minutes disk 131 which is similar to that of the first embodiment.
  • the minute disc 131 carries two lugs (or fingers) 135a, 135b which are arranged in diametrically opposite positions. As can be seen, the two lugs are arranged to project from the periphery of the disc 131 between the last number of one of the series of multiples of 10 (the number 50 in this case) and the first number of the another series of multiples of 10 (the number 00).
  • the outer edge of the minute disc 131 is formed by an annular zone 139 with a cylindrical outer profile which extends along the entire circumference of the disc 131 with the exception of two interruptions at the level of the lugs 135a and 135b. These two interruptions are made up of two hollow cuts from the bottom of which the two lugs protrude.
  • a portion of the annular zone 139 with a cylindrical profile gradually gives way to one of the two hollow cuts. This change causes a space to appear between tooth 137a and disc 131, so that hour disc 133 is no longer immobilized.
  • the lug 135a or 135b meets the side of the tooth 137a, it drives it and thus rotates the tooth by one step.
  • hour disc 133 so that the next tooth 137 comes to rest by bracing against another portion with a cylindrical profile of the annular zone 139.
  • the hour disc 133 is therefore immobilized again after having pivoted by exactly the angular value of a tooth pitch.
  • the mechanism for driving the hour disc 133 by the minute disc 131 maintains the hour disc 133 in an indexed position during periods when none of the lugs 135a, 135b are not is engaged in the space between two teeth 137.
  • FIG. 7 is a top plan view of a digital hour and minute display, which conforms to a third particular embodiment of the invention.
  • the second and the third embodiment have a large number of characteristics in common. This is why the elements of the display shown in the Figure 7 which are identical or equivalent to elements represented in the Figure 6 are designated in the Figure 7 by the same reference numbers increased by 100.
  • disk 231 is designed to display the minutes from 15 to 15.
  • the twelve numbers it carries, regularly distributed on a peripheral ring, are made up of three series of four multiples of 15 ordered from 00 to 45
  • the minute disc 231 carries three lugs 235a, 235b and 235c which are regularly spaced around the disc.
  • the three lugs are arranged to project from the periphery of the disc 231 between the last number of one of the series of multiples of 15 (the number 45 in this case) and the first number of the another series of multiples of 15 (the number 00).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)

Description

La présente invention concerne un affichage numérique pour pièce d'horlogerie comprenant un premier disque indicateur et un second disque indicateur portant chacun une série de chiffres ou de paires de chiffres régulièrement répartis sur un anneau périphérique de manière à former au moins une suite ordonnée, les deux disques indicateurs étant agencés de manière à présenter sélectivement un des chiffres ou paires de chiffres portés par le premier disque indicateur en association avec un des chiffres ou paires de chiffres portés par le second disque indicateur, l'affichage numérique comprenant en outre un mécanisme d'entraînement du second disque indicateur par le premier disque indicateur, le mécanisme d'entraînement comportant une denture solidaire du second disque indicateur, la denture comprenant une dent pour chaque chiffre ou paire de chiffres porté par le second disque indicateur, et au moins un doigt solidaire du premier disque indicateur, le doigt étant agencé pour venir en prise avec une dent du second disque indicateur de façon à incrémenter ce dernier d'un pas une fois par tour.The present invention relates to a digital display for a timepiece comprising a first indicator disk and a second indicator disk each carrying a series of numbers or pairs of numbers regularly distributed over a peripheral ring so as to form at least one ordered sequence, the two indicator discs being arranged so as to selectively present one of the digits or pairs of digits carried by the first indicator disc in association with one of the digits or pairs of digits carried by the second indicator disc, the digital display further comprising a mechanism for driving the second indicator disc by the first indicator disc, the drive mechanism comprising teeth integral with the second indicator disc, the teeth comprising one tooth for each digit or pair of digits carried by the second indicator disc, and at least one finger secured to the first indicator disc, the finger being arranged to engage with a tooth of the second indicator disc so as to increment the latter by one step once per revolution.

L'invention concerne également une pièce d'horlogerie comportant un affichage numérique conforme à la définition ci-dessus.The invention also relates to a timepiece comprising a digital display conforming to the definition above.

ART ANTERIEURPRIOR ART

On connait déjà des affichages numériques pour pièce d'horlogerie qui sont conformes à la définition donnée ci-dessus. Ces affichages connus présentent certains défauts. En particulier, les deux disques peuvent se désynchroniser, par exemple sous l'effet d'un choc. En effet, en dehors des moments où le doigt du premier disque est engagé dans la denture du second, aucun lien cinématique ne relie les deux disques l'un à l'autre. C'est la raison pour laquelle on utilise deux ressorts-sautoirs pour maintenir le premier et le second disque en position, et pour éviter que l'un d'entre eux ne tourne accidentellement. En général, dans le but de limiter la quantité d'énergie mécanique qui doit être dépensée pour faire volontairement tourner les disques, on utilise des ressorts-sautoirs aussi faibles que possible. Toutefois, lorsqu'on réduit ainsi la force de retenue exercée par les sautoirs sur les disques, on court un risque non négligeable que l'affichage se dérègle en cas de choc.We already know digital displays for timepieces which comply with the definition given above. These known displays have certain defects. In particular, the two disks can become desynchronized, for example under the effect of a shock. Indeed, apart from the moments when the finger of the first disc is engaged in the teeth of the second, no kinematic link connects the two discs to each other. This is why two jumper springs are used to hold the first and second discs in position, and to prevent one of them from accidentally rotating. In general, in order to limit the amount of mechanical energy that must be expended to voluntarily rotate the discs, jump springs that are as weak as possible are used. However, when the retaining force exerted by the jumpers on the discs is thus reduced, there is a significant risk that the display will be disrupted in the event of an impact.

Le document EP 2 113 817 A1 décrit un affichage numérique pour compteur d'heures de chronographe. L'affichage numérique comprend un premier mobile d'affichage et un deuxième mobile d'affichage. L'affichage numérique comprend également un mécanisme d'entraînement du deuxième mobile par le premier mobile. Le premier mobile est formé d'un empilement comprenant notamment un disque d'affichage des unités d'heures, une étoile à 10 dents, et un doigt d'arrêtage comportant une surface de blocage formant une portion de cercle et un ergot. Le deuxième mobile d'affichage, quant à lui, est formé d'un empilement comprenant notamment un disque d'affichage des dizaines d'heures, une croix de Malte à dix branches et dix encoches. L'homme du métier comprendra que l'encombrement d'un affichage numérique comme celui qui vient d'être décrit est assez important. En particulier dans le sens de la hauteur.The document EP 2 113 817 A1 describes a digital display for a chronograph hour counter. The digital display comprises a first display mobile and a second display mobile. The digital display also includes a mechanism for driving the second mobile by the first mobile. The first mobile is formed of a stack comprising in particular a disk for displaying the hour units, a star with 10 teeth, and a stopping finger comprising a blocking surface forming a portion of a circle and a lug. The second display mobile, for its part, is formed of a stack including in particular a tens of hours display disc, a Maltese cross with ten branches and ten notches. Those skilled in the art will understand that the bulk of a digital display like the one just described is quite significant. Particularly in the direction of height.

BREF EXPOSE DE L'INVENTIONBRIEF STATEMENT OF THE INVENTION

Un but de la présente invention est de remédier aux inconvénients de l'art antérieur qui viennent d'être expliqués. La présente invention atteint ce but ainsi que d'autres en fournissant un affichage numérique conforme à la revendication 1 annexée.An aim of the present invention is to remedy the disadvantages of the prior art which have just been explained. The present invention achieves this and other goals by providing a digital display according to appended claim 1.

Conformément à l'invention, le mécanisme d'entraînement du second disque par le premier disque est du type à croix de Malte. Comme le sait l'homme du métier, un mécanisme d'entraînement du type croix de Malte est un dispositif mécanique permettant de transformer un mouvement de rotation continue en une rotation saccadée. La figure 4 annexée représente un mécanisme d'entraînement à croix de Malte de conception classique. Le fonctionnement du mécanisme d'entraînement représenté est le suivant : un mobile menant 21, qui comporte une came profilée 23 en forme de cylindrique incomplet et un ergot 25, tourne de manière continue. Le mobile mené (autrement dit la croix de Malte) 27 comporte quatre branches (ou dents). L'ergot 25 pénètre dans l'espace (ou rainure) entre deux branches et fait tourner la croix de Malte 27 d'un ¼ de tour. Le mobile menant 21 ne cesse pas de tourner de sorte que l'ergot 25 ressort de la rainure. La croix de Malte 27 est alors immobilisée par la coopération du sommet concave d'une de ses branches avec la partie cylindrique de la came profilée 23. En effet, la forme de la partie cylindrique de la came profilée 23 est complémentaire de la forme concave du sommet des branches de la croix de Malte 27, de sorte que la came profilée 23 maintient la croix de Malte 27 dans une position indexée durant les périodes où l'ergot 25 n'est pas engagé dans une des rainures.In accordance with the invention, the mechanism for driving the second disk by the first disk is of the Maltese cross type. As those skilled in the art know, a Maltese cross type drive mechanism is a mechanical device making it possible to transform a continuous rotational movement into a jerky rotation. There Figure 4 The appendix shows a Maltese cross drive mechanism of classical design. The operation of the driving mechanism shown is as follows: a driving mobile 21, which comprises a profiled cam 23 in the shape of an incomplete cylindrical and a lug 25, rotates continuously. The driven mobile (in other words the Maltese cross) 27 has four branches (or teeth). The lug 25 enters the space (or groove) between two branches and rotates the Maltese cross 27 by a ¼ turn. The leading mobile 21 does not stop rotating so that the lug 25 comes out of the groove. The Maltese cross 27 is then immobilized by the cooperation of the concave top of one of its branches with the cylindrical part of the profiled cam 23. In fact, the shape of the cylindrical part of the profiled cam 23 is complementary to the concave shape from the top of the branches of the Maltese cross 27, so that the profiled cam 23 maintains the Maltese cross 27 in an indexed position during periods when the lug 25 is not engaged in one of the grooves.

Conformément à l'invention, les dents de la denture qui est solidaire du second disque indicateur ont une forme tronquée avec un sommet concave. De plus, l'affichage numérique comprend une came qui est solidaire du premier disque indicateur en position coaxiale. La came est de forme circulaire sauf au voisinage de chacun des dits au moins un doigt, où la forme généralement ronde fait place à une découpe en creux. Le profil circulaire de la came est complémentaire du profil concave du sommet des dents du second disque indicateur.In accordance with the invention, the teeth of the teeth which are secured to the second indicator disc have a truncated shape with a concave top. In addition, the digital display includes a cam which is secured to the first indicator disc in a coaxial position. The cam is circular in shape except in the vicinity of each of said at least one finger, where the generally round shape gives way to a recessed cutout. The circular profile of the cam is complementary to the concave profile of the top of the teeth of the second indicator disc.

Conformément à l'invention, le mécanisme d'entraînement du second disque indicateur par le premier disque indicateur maintient le second disque indicateur dans une position indexée durant les périodes où aucun des dits au moins un doigt n'est engagé dans la denture du second disque indicateur. Un avantage lié à cette caractéristique est qu'il n'est pas nécessaire d'avoir recours à un sautoir pour indexer le second disque indicateur.According to the invention, the mechanism for driving the second indicator disk by the first indicator disk maintains the second indicator disk in an indexed position during periods when none of said at least one finger is engaged in the teeth of the second disk indicator. An advantage linked to this characteristic is that it is not necessary to use a jumper to index the second indicator disk.

Conformément à l'invention, le second disque indicateur et la denture sont agencés sur un seul et même niveau, lesdites dents tronquées faisant saillie à partir de la circonférence du second disque indicateur, le profil de la came et ledit au moins un doigt constituant le bord extérieur du premier disque indicateur.According to the invention, the second indicator disc and the teeth are arranged on one and the same level, said truncated teeth projecting from the circumference of the second indicator disk, the profile of the cam and said at least one finger constituting the outer edge of the first indicator disk.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en plan côté cadran d'une montre-bracelet qui comporte un mécanisme de réveil avec des moyens d'indication de l'heure de réveil, ces derniers comportant un affichage numérique conforme à un mode de réalisation particulier de l'invention ;
  • la figure 2 est une vue en plan de dessus d'un affichage numérique des heures et des minutes, qui est conforme à un premier mode de réalisation particulier de l'invention ;
  • la figure 3 est une vue schématique montrant l'association d'une paire de chiffres portée par le premier disque indicateur et d'une paire de chiffres portée par le deuxième disque indicateur ;
  • la figure 4 est une représentation schématique en plan d'un mécanisme d'entraînement à croix de Malte de l'art antérieur ;
  • la figure 5 est une vue partielle agrandie de l'affichage numérique de la figure 2 et montrant plus particulièrement le doigt solidaire du premier disque indicateur et une des dents solidaires du second disque indicateur ;
  • la figure 6 est une vue en plan de dessus d'un affichage numérique des heures et des minutes, qui est conforme à un deuxième mode de réalisation particulier de l'invention ;
  • la figure 7 est une vue en plan de dessus d'un affichage numérique des heures et des minutes, qui est conforme à un troisième mode de réalisation particulier de l'invention.
Other characteristics and advantages of the present invention will appear on reading the description which follows, given solely by way of non-limiting example, and made with reference to the appended drawings in which:
  • there figure 1 is a plan view on the dial side of a wristwatch which comprises an alarm mechanism with means for indicating the alarm time, the latter comprising a digital display according to a particular embodiment of the invention;
  • there figure 2 is a top plan view of a digital display of hours and minutes, which conforms to a first particular embodiment of the invention;
  • there Figure 3 is a schematic view showing the association of a pair of digits carried by the first indicator disc and a pair of digits carried by the second indicator disc;
  • there Figure 4 is a schematic plan representation of a prior art Maltese cross drive mechanism;
  • there Figure 5 is an enlarged partial view of the digital display of the figure 2 and showing more particularly the finger secured to the first indicator disc and one of the teeth secured to the second indicator disc;
  • there Figure 6 is a top plan view of a digital display of hours and minutes, which conforms to a second particular embodiment of the invention;
  • there Figure 7 is a top plan view of a digital hour and minute display, which conforms to a third particular embodiment of the invention.

DESCRIPTION DETAILLEE DE MODES DE REALISATIONDETAILED DESCRIPTION OF EMBODIMENTS

L'affichage numérique pour pièce d'horlogerie de l'invention se prête à de très nombreuses applications : indication numérique de l'heure courante (heure et minutes) ; calendrier ; compteur décimal lié à une fonction non-horaire (compteur de golf par exemple) ; etc.The digital display for a timepiece of the invention lends itself to many applications: digital indication of the current time (hour and minutes); calendar ; decimal counter linked to a non-timely function (golf counter for example); etc.

La figure 1 annexée est une vue en plan côté cadran d'une montre-bracelet qui comporte un mécanisme de réveil avec des moyens d'indication de l'heure de réveil, ces derniers comportant un affichage numérique conforme à un mode de réalisation particulier de l'invention. Certaines caractéristiques de la montre-bracelet représentée, qui sont en lien avec l'invention, vont maintenant être décrites. La montre de la figure 1 comporte une couronne de remontage et de mise à l'heure (référencée 11) qui dépasse de la carrure de la montre à 4 heures. Lorsque la couronne 11 est en première position tirée, elle permet de décaler l'heure d'alarme dans un sens ou dans l'autre en faisant tourner la couronne. La montre-bracelet comporte encore un affichage numérique prévu pour indiquer l'heure d'alarme. Cet affichage est conforme à un mode de réalisation particulier de l'invention. L'affichage numérique est agencé pour indiquer l'heure d'alarme à travers deux guichets (référencés 3 et 5) qui sont aménagés côte à côte dans le cadran 7 à douze heures. Un premier des deux guichets (référencé 3) indique l'heure sous la forme d'un nombre entier entre 1 et 12, et le deuxième guichet (référencé 5) indique la minute sous la forme d'un nombre à deux chiffres. Enfin, un troisième petit guichet (référencé 9) est disposé entre les deux premiers guichets 3 et 5 et le centre du cadran. L'indicateur qui apparaît dans le petit guichet 9 est un indicateur jour/nuit associé à l'heure d'alarme.There figure 1 attached is a plan view on the dial side of a wristwatch which comprises an alarm mechanism with means for indicating the alarm time, the latter comprising a digital display conforming to a particular embodiment of the invention . Certain characteristics of the wristwatch shown, which are linked to the invention, will now be described. The watch of the figure 1 includes a winding and time-setting crown (referenced 11) which protrudes from the middle of the watch at 4 o'clock. When crown 11 is in the first pulled out position, it allows you to shift the alarm time in one direction or the other by rotating the crown. The wristwatch also has a digital display designed to indicate the alarm time. This display conforms to a particular embodiment of the invention. The digital display is arranged to indicate the alarm time through two windows (referenced 3 and 5) which are arranged side by side in dial 7 at twelve o'clock. A first of the two windows (referenced 3) indicates the hour in the form of an integer between 1 and 12, and the second window (referenced 5) indicates the minute in the form of a two-digit number. Finally, a third small window (referenced 9) is placed between the first two windows 3 and 5 and the center of the dial. The indicator which appears in the small window 9 is a day/night indicator associated with the alarm time.

Un affichage numérique des heures et des minutes, qui est conforme à un premier mode de réalisation particulier de l'invention va maintenant être décrit en faisant référence aux figures 1, 2, 3 et 5.A digital display of hours and minutes, which conforms to a first particular embodiment of the invention will now be described with reference to the figures 1 , 2 , 3 And 5 .

L'affichage représenté comporte deux disques agencés côte à côte, un disque des minutes 31 qui porte douze nombres à deux chiffres entre 00 et 55 et un disque des heures 33 qui porte les nombres entiers de 01 à 12. On notera que, de façon équivalente, un espace vide pourrait remplacer le zéro lorsque ce dernier se trouve à gauche dans une paire de chiffres. D'autre part, bien que les deux disques 31, 33 ont le même diamètre dans l'exemple illustré, on comprendra qu'ils pourraient avoir des diamètres différents. De manière classique, les deux disques 31, 33 sont agencés sous le cadran 7 (figure 1) de sorte que seuls les deux nombres qui occupent les positions directement en regard l'une de l'autre sont visibles à travers les deux guichets 3, 5, comme le montre les figures 1 et 3.The display shown comprises two discs arranged side by side, a minutes disc 31 which carries twelve two-digit numbers between 00 and 55 and an hours disc 33 which carries the whole numbers from 01 to 12. It will be noted that, so equivalent, a blank space could replace the zero when the latter is on the left in a pair of digits. On the other hand, although the two disks 31, 33 have the same diameter in the example illustrated, it will be understood that they could have different diameters. Conventionally, the two disks 31, 33 are arranged under the dial 7 ( figure 1 ) so that only the two numbers which occupy the positions directly opposite each other are visible through the two apertures 3, 5, as shown in figures 1 And 3 .

Conformément à ce qui a été expliqué plus haut, le porteur de la montre-bracelet du présent exemple peut actionner le disque des minutes 31 en rotation, dans un sens ou dans l'autre, à l'aide de la couronne de remontage et de mise à l'heure 11 (figure 1). De plus, conformément à l'invention, l'affichage représenté comporte un mécanisme d'entraînement du disque des heures par le disque des minutes. Le disque des minutes 31 porte un ergot (ou doigt) 35 qui fait saillie radialement de sa périphérie, et le disque des heures 33 porte douze dents tronquées 37 qui sont régulièrement espacées le long de sa circonférence. L'affichage du présent exemple est conçu pour prendre le moins de place possible en hauteur. A cette fin, les dents 37 et le disque 33 dont elles sont solidaires sont agencés sur un seul et même niveau, les dents tronquées 37 faisant ainsi saillies à partir de la circonférence du disque 33. On comprendra toutefois que, les dents 37 pourraient alternativement constituer la denture d'une étoile arrangée coaxialement sous le disque des heures. Selon ce deuxième cas de figure, le disque des minutes 31 serait de préférence plus épais, de manière à ce que les chiffres qu'il porte puissent être au même niveau que les chiffres portés par le disque des heures, tout en permettant à l'ergot 35 d'être au même niveau que les dents 37.In accordance with what has been explained above, the wearer of the wristwatch of the present example can activate the minute disc 31 in rotation, in one direction or the other, using the winding crown and time setting 11 ( figure 1 ). Furthermore, in accordance with the invention, the display shown comprises a mechanism for driving the hour disk by the minute disk. The minute disc 31 carries a lug (or finger) 35 which projects radially from its periphery, and the hour disc 33 carries twelve truncated teeth 37 which are regularly spaced along its circumference. The display in this example is designed to take up as little space as possible in height. To this end, the teeth 37 and the disc 33 to which they are integral are arranged on one and the same level, the truncated teeth 37 thus projecting from the circumference of the disc 33. It will be understood, however, that the teeth 37 could alternatively constitute the teeth of a star arranged coaxially under the hour disc. According to this second scenario, the minute disc 31 would preferably be thicker, so that the numbers it carries can be at the same level as the numbers carried by the hour disc, while allowing the lug 35 to be at the same level as teeth 37.

En se référant plus particulièrement à la figure 2, on peut voir que le bord extérieur du disque des minutes 31 est formé par une zone annulaire 39 à bord extérieur cylindrique qui s'étend le long de la majeure partie de la circonférence du disque 31. La figure 2 montre également que les douze dents tronquées 37 ont chacune un sommet arrondi concave, la courbure de l'arrondi étant complémentaire de la courbure du bord extérieur cylindrique de la zone annulaires 39. De plus, l'entraxe entre le disque des minutes et celui des heures est choisi de manière à ce que le bord cylindrique convexe du disque des minutes 31 puisse s'emboîter dans l'arrondi concave que présente le sommet d'une dent 37. On comprendra que le disque des minutes 31 fonctionne à la manière d'une came profilée en forme de cylindre incomplet, le disque des heures 33 étant maintenu immobilisé alors que la came à profil cylindrique tourne autour de son axe.With particular reference to the figure 2 , it can be seen that the outer edge of the minute disc 31 is formed by an annular zone 39 with a cylindrical outer edge which extends along most of the circumference of the disc 31. The figure 2 also shows that the twelve truncated teeth 37 each have a concave rounded top, the curvature of the rounding being complementary to the curvature of the cylindrical outer edge of the annular zone 39. In addition, the distance between the minute disc and that of the hours is chosen so that the convex cylindrical edge of the minute disc 31 can fit into the concave rounding presented by the top of a tooth 37. It will be understood that the minute disc 31 functions in the manner of a profiled cam in the shape of an incomplete cylinder, the hour disc 33 being held immobilized while the cam with a cylindrical profile rotates around its axis.

La zone annulaire 39 s'étend le long de l'intégralité de la circonférence du disque 31 à l'exception d'une interruption au niveau de l'ergot 35. En se référant toujours à la figure 2, on peut voir que les deux extrémités de la zone annulaire 39, de part et d'autre de l'ergot 35, présentent chacune une forme de chanfrein en pente douce, et que les deux chanfreins qui se font face définissent ensemble une découpe en creux du fond de laquelle l'ergot 35 fait saillie. Dans le présent exemple, la découpe en creux possède une forme symétrique centrée sur l'ergot. Lorsqu'au cours de la rotation du disque des minutes, l'ergot 35 s'approche de la dent 37a, la première extrémité de la zone annulaire 39 passe en regard de l'arrondi concave du sommet de la dent, le bord extérieur cylindrique faisant progressivement place à la découpe en creux. Ce changement fait apparaître un espace entre la dent 37a et le disque 31, de sorte que le disque des heures 33 n'est plus immobilisé (figure 5).The annular zone 39 extends along the entire circumference of the disc 31 with the exception of an interruption at the level of the lug 35. Always referring to the figure 2 , we can see that the two ends of the annular zone 39, on either side of the lug 35, each have a gently sloping chamfer shape, and that the two chamfers which face each other together define a cut in hollow from the bottom of which the lug 35 projects. In the present example, the recessed cutout has a symmetrical shape centered on the lug. When during the rotation of the minute disc, the lug 35 approaches the tooth 37a, the first end of the annular zone 39 passes opposite the concave rounding of the top of the tooth, the cylindrical outer edge gradually making way for hollow cutting. This change causes a space to appear between the tooth 37a and the disc 31, so that the hour disc 33 is no longer immobilized ( Figure 5 ).

Ensuite, lorsqu'on poursuivant sur sa trajectoire, l'ergot 35 rencontre le flanc de la dent 37a, il l'entraîne et fait ainsi pivoter d'un pas le disque des heures 33, de sorte que la dent 37 suivante vient s'immobiliser par arc-boutement contre la deuxième extrémité du bord extérieur cylindrique de la zone annulaire 39. Le disque des heures 33 est donc à nouveau immobilisé après avoir pivoté d'exactement la valeur angulaire d'un pas de la denture. On comprendra en outre que, conformément à l'invention, le mécanisme d'entraînement du disque des heures 33 par le disque des minutes 31 maintient le disque des heures 33 dans une position indexée durant les périodes où l'ergot 35 n'est pas engagé dans l'espace entre deux dents 37. Il n'est donc pas nécessaire de prévoir un ressort-sautoir pour assurer l'indexage du disque des heures 33.Then, when continuing on its trajectory, the lug 35 meets the side of the tooth 37a, it drives it and thus rotates the hour disc 33 one step, so that the next tooth 37 comes to immobilize by bracing against the second end of the cylindrical outer edge of the annular zone 39. The hour disc 33 is therefore immobilized again after having pivoted by exactly the angular value of one pitch of the teeth. It will also be understood that, in accordance with the invention, the mechanism for driving the hour disc 33 by the minute disc 31 maintains the hour disc 33 in an indexed position during periods when the lug 35 is not engaged in the space between two teeth 37. It is therefore not necessary to provide a jumper spring to ensure the indexing of the hour disc 33.

En se référant encore à la figure 2, on peut voir toutefois que, dans l'exemple représenté, l'affichage numérique comporte deux ressorts-sautoirs 41a et 41b respectivement agencés de manière à indexer le disque des minutes 31 et le disque des heures 33. Grâce à ces deux ressorts, il est en effet possible de positionner angulairement le disque des minutes 31 et le disque des heures 33 avec une précision meilleure que celle offerte par l'emboîtement du bord cylindrique du disque des minutes dans l'arrondi concave d'une dent 37 du disque des heures. On comprendra que, dans l'exemple illustré, c'est bien le mécanisme d'entraînement du disque des heures par le disque des minutes qui assure que les deux disques ne se désynchronisent pas en cas de chocs. Les ressorts-sautoirs assurent uniquement le positionnement fin. Ces derniers n'ont pas besoin d'être capables de résister aux chocs. On peut donc utiliser des ressorts-sautoirs plus faibles que ceux utilisés dans l'art antérieur.Referring again to the figure 2 , however, we can see that, in the example shown, the digital display comprises two jumper springs 41a and 41b respectively arranged so as to index the minutes disk 31 and the hours disk 33. Thanks to these two springs, it is in fact possible to angularly position the minute disc 31 and the hour disc 33 with better precision than that offered by the nesting of the cylindrical edge of the minute disc in the concave rounding of a tooth 37 of the hour disc . It will be understood that, in the example illustrated, it is indeed the mechanism for driving the hours disk by the minutes disk which ensures that the two disks do not become desynchronized in the event of shocks. The jumper springs only ensure fine positioning. These do not need to be able to withstand shocks. We can therefore use jump springs that are weaker than those used in the prior art.

La figure 6 est une vue en plan de dessus d'un affichage numérique des heures et des minutes, qui est conforme à un deuxième mode de réalisation particulier de l'invention. En comparant la figure 6 et la figure 2, on peut observer que le premier et le deuxième mode de réalisation ont un grand nombre de caractéristiques en commun. C'est la raison pour laquelle les éléments de l'affichage de la figure 6 qui sont identiques ou équivalents à des éléments représentés dans la figure 2 sont désignés dans la figure 6 par les mêmes numéros de référence augmentés de 100.There Figure 6 is a top plan view of a digital hour and minute display, which conforms to a second particular embodiment of the invention. By comparing the Figure 6 and the figure 2 , it can be observed that the first and the second embodiment have a large number of characteristics in common. This is why the elements of the display of the Figure 6 which are identical or equivalent to elements represented in the figure 2 are designated in the Figure 6 by the same reference numbers increased by 100.

L'affichage de la figure 6 comporte un disque des minutes 131 et un disque des heures 133 agencés côte à côte. Comme c'était déjà le cas avec le premier mode de réalisation, le disque des heures porte la suite des nombres entiers de 01 à 12 qui sont régulièrement répartis le long de sa circonférence. La principale différence entre l'affichage de la figure 6 et celui de la figure 2 concerne le disque des minutes. En effet le disque 131 est prévu pour afficher les minutes de 10 en 10. A cette fin, les douze nombres qu'il porte, régulièrement répartis sur un anneau périphérique, sont constitués par deux séries de six multiples de 10 ordonnés de 00 à 50.The display of the Figure 6 features a 131 minute disc and a 133 hour disc arranged side by side. As was already the case with the first embodiment, the hours disc carries the sequence of integers from 01 to 12 which are regularly distributed along its circumference. The main difference between the display of the Figure 6 and that of the figure 2 concerns the minutes disc. In fact, disk 131 is designed to display the minutes from 10 to 10. To this end, the twelve numbers it carries, regularly distributed over a peripheral ring, are made up of two series of six multiples of 10 ordered from 00 to 50 .

L'affichage de la figure 6 comporte également un mécanisme d'entraînement du disque des heures 133 par le disque des minutes 131 qui est similaire à celui du premier mode de réalisation. Toutefois, le disque des minutes 131 porte deux ergots (ou doigts) 135a, 135b qui sont agencés en positions diamétralement opposées. Comme on peut le voir, les deux ergots sont agencés pour faire saillie à partir de la périphérie du disque 131 entre le dernier nombre d'une des séries de multiple de 10 (le nombre 50 en l'occurrence) et le premier nombre de l'autre série de multiples de 10 (le nombre 00).The display of the Figure 6 also includes a mechanism for driving the hours disk 133 by the minutes disk 131 which is similar to that of the first embodiment. However, the minute disc 131 carries two lugs (or fingers) 135a, 135b which are arranged in diametrically opposite positions. As can be seen, the two lugs are arranged to project from the periphery of the disc 131 between the last number of one of the series of multiples of 10 (the number 50 in this case) and the first number of the another series of multiples of 10 (the number 00).

En se référant toujours à la figure 6, on peut voir que le bord extérieur du disque des minutes 131 est formé par une zone annulaire 139 à profil extérieur cylindrique qui s'étend le long de l'intégralité de la circonférence du disque 131 à l'exception de deux interruptions au niveau des ergots 135a et 135b. Ces deux interruptions sont constituées par deux découpes en creux du fond desquelles les deux ergots font saillies. Lorsqu'au cours de la rotation du disque des minutes, l'un des deux ergots 135a, 135b s'approche de la dent 137a, une portion de la zone annulaire 139 à profil cylindrique fait progressivement place à une des deux découpes en creux. Ce changement fait apparaître un espace entre la dent 137a et le disque 131, de sorte que le disque des heures 133 n'est plus immobilisé. Ensuite, lorsqu'on poursuivant sur sa trajectoire, l'ergot 135a ou 135b rencontre le flanc de la dent 137a, il l'entraîne et fait ainsi pivoter d'un pas le disque des heures 133, de sorte que la dent 137 suivante vient s'immobiliser par arc-boutement contre une autre portion à profil cylindrique de la zone annulaire 139. Le disque des heures 133 est donc à nouveau immobilisé après avoir pivoté d'exactement la valeur angulaire d'un pas de la denture. On comprendra en outre que, conformément à l'invention, le mécanisme d'entraînement du disque des heures 133 par le disque des minutes 131 maintient le disque des heures 133 dans une position indexée durant les périodes où aucun des ergots 135a, 135b n'est engagé dans l'espace entre deux dents 137.Always referring to the Figure 6 , it can be seen that the outer edge of the minute disc 131 is formed by an annular zone 139 with a cylindrical outer profile which extends along the entire circumference of the disc 131 with the exception of two interruptions at the level of the lugs 135a and 135b. These two interruptions are made up of two hollow cuts from the bottom of which the two lugs protrude. When during the rotation of the minute disc, one of the two lugs 135a, 135b approaches the tooth 137a, a portion of the annular zone 139 with a cylindrical profile gradually gives way to one of the two hollow cuts. This change causes a space to appear between tooth 137a and disc 131, so that hour disc 133 is no longer immobilized. Then, when continuing on its trajectory, the lug 135a or 135b meets the side of the tooth 137a, it drives it and thus rotates the tooth by one step. hour disc 133, so that the next tooth 137 comes to rest by bracing against another portion with a cylindrical profile of the annular zone 139. The hour disc 133 is therefore immobilized again after having pivoted by exactly the angular value of a tooth pitch. It will also be understood that, in accordance with the invention, the mechanism for driving the hour disc 133 by the minute disc 131 maintains the hour disc 133 in an indexed position during periods when none of the lugs 135a, 135b are not is engaged in the space between two teeth 137.

La figure 7 est une vue en plan de dessus d'un affichage numérique des heures et des minutes, qui est conforme à un troisième mode de réalisation particulier de l'invention. En comparant la figure 7 à la figure 6, on peut observer que le deuxième et le troisième mode de réalisation ont un grand nombre de caractéristiques en commun. C'est la raison pour laquelle les éléments de l'affichage représenté dans la figure 7 qui sont identiques ou équivalents à des éléments représentés dans la figure 6 sont désignés dans la figure 7 par les mêmes numéros de référence augmentés de 100.There Figure 7 is a top plan view of a digital hour and minute display, which conforms to a third particular embodiment of the invention. By comparing the Figure 7 to the Figure 6 , it can be observed that the second and the third embodiment have a large number of characteristics in common. This is why the elements of the display shown in the Figure 7 which are identical or equivalent to elements represented in the Figure 6 are designated in the Figure 7 by the same reference numbers increased by 100.

Un examen attentif de la figure 7 montre que la principale différence entre l'affichage représenté dans cette figure et celui représenté dans la figure 6 concerne le disque des minutes. En effet le disque 231 est prévu pour afficher les minutes de 15 en 15. A cette fin, les douze nombres qu'il porte, régulièrement répartis sur un anneau périphérique, sont constitués de trois séries de quatre multiples de 15 ordonnés de 00 à 45. D'autre part, le disque des minutes 231 porte trois ergots 235a, 235b et 235c qui sont régulièrement espacés autour du disque. Comme on peut le voir, les trois ergots sont agencés pour faire saillie à partir de la périphérie du disque 231 entre le dernier nombre d'une des séries de multiple de 15 (le nombre 45 en l'occurrence) et le premier nombre de l'autre série de multiples de 15 (le nombre 00).A careful examination of the Figure 7 shows that the main difference between the display shown in this figure and that shown in the Figure 6 concerns the minutes disc. In fact, disk 231 is designed to display the minutes from 15 to 15. To this end, the twelve numbers it carries, regularly distributed on a peripheral ring, are made up of three series of four multiples of 15 ordered from 00 to 45 On the other hand, the minute disc 231 carries three lugs 235a, 235b and 235c which are regularly spaced around the disc. As can be seen, the three lugs are arranged to project from the periphery of the disc 231 between the last number of one of the series of multiples of 15 (the number 45 in this case) and the first number of the another series of multiples of 15 (the number 00).

On comprendra en outre que diverses modifications et/ou améliorations évidentes pour un homme du métier peuvent être apportées au mode de réalisation qui fait l'objet de la présente description sans sortir du cadre de la présente invention définie par les revendications annexées.It will also be understood that various modifications and/or improvements obvious to a person skilled in the art can be made to the embodiment which is the subject of the present description without departing from the scope of the present invention defined by the appended claims.

Claims (6)

  1. Digital display for a timepiece comprising a first indicator disc (31; 131; 231) and a second indicator disc (33; 133; 233), each bearing a series of figures or of pairs of figures uniformly distributed on a peripheral ring so as to form at least one ordered sequence, the two indicator discs being arranged so as to selectively present one of the figures or pairs of figures borne by the first indicator disc (31; 131; 231) in association with one of the figures or pairs of figures borne by the second indicator disc (33; 133; 233), the digital display further comprising a mechanism for driving the second disc by the first disc, the driving mechanism being of the Maltese cross type and comprising toothing which is fixed relative to the second disc and which comprises a tooth (37, 37A; 137, 137A; 237, 237A) for each figure or pair of figures borne by the second disc (33; 133; 233), the teeth (37, 37A; 137, 137A; 237, 237A) being of a truncated shape with a concave peak, and comprising at least one finger (35; 135a, 135b; 235a, 235b, 235c) fixed relative to the first disc (31; 131; 231) and arranged to come, once per turn of this first disc, into engagement with a tooth (37a, 137a, 237) of the second disc (33; 133; 233) so as to increment the second disc by one step, the digital display comprising a cam fixed relative to the first disc (31; 131; 231) in a coaxial position, the cam having a circular profile in which is formed, at the location of each of said at least one finger (35; 135a, 135b; 235a, 235b, 235c), a hollow cut-out, the circular profile of the cam being complementary to the concave profile of the peak of the teeth of the second disc (33; 133; 233); characterised in that the second indicator disc (33; 133; 233) and the toothing are arranged at one and the same level, said truncated teeth (37, 37A; 137, 137A; 237, 237A) protruding from the circumference of the second indicator disc, the profile of the cam and said at least one finger (35; 135a, 135b; 235a, 235b, 235c) constituting the outer edge of the first indicator disc (31; 131; 231).
  2. Digital display for a timepiece as claimed in claim 1, characterised in that the first indicator disc (31; 131; 231) has a cylindrical outer profile interrupted by a hollow cut-out arranged at each of said at least one finger (35; 135a, 135b; 235a, 235b, 235c).
  3. Digital display for a timepiece as claimed in claim 1 or 2, characterised in that the series of figures or pairs of figures borne by the first indicator disc (31) is formed by a single ordered sequence, and in that the driving mechanism comprises a single finger (35) borne by the first indicator disc (31).
  4. Digital display for a timepiece as claimed in claim 1 or 2, characterised in that the series of figures or pairs of figures borne by the first indicator disc (131) is formed by two identical ordered sequences, each arranged on a peripheral half-ring, and in that the driving mechanism comprises two fingers (135a, 135b) borne by the first indicator disc (131).
  5. Digital display for a timepiece as claimed in claim 1 or 2, characterised in that the series of figures or pairs of figures borne by the first indicator disc (231) is formed by at least three identical ordered sequences, each arranged on a peripheral ring sector and in that the driving mechanism comprises fingers (235a, 235b, 235c) borne by the first indicator disc (231), the number of fingers being equal to the number of identical ordered sequences.
  6. Digital display for a timepiece as claimed in any one of the preceding claims, characterised in that it comprises two jumper springs (41a, 41b; 141a, 141b; 241a, 241b) respectively arranged so as to index the first indicator disc (31; 131; 231) and the second indicator disc (33; 133; 233).
EP19744848.3A 2018-06-20 2019-06-07 Digital display for a timepiece Active EP3811157B1 (en)

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EP18178911 2018-06-20
PCT/IB2019/054757 WO2019243943A1 (en) 2018-06-20 2019-06-07 Digital display for a timepiece

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854280A (en) * 1974-06-10 1974-12-17 Timex Corp Mechanical digital watch
JPS56129879A (en) * 1980-03-17 1981-10-12 Citizen Watch Co Ltd Digital time indicating mechanism
EP2113817B1 (en) * 2007-02-22 2018-12-26 ETA SA Manufacture Horlogère Suisse Chronograph

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