EP1248164A1 - Clockwork - Google Patents

Clockwork Download PDF

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Publication number
EP1248164A1
EP1248164A1 EP01201246A EP01201246A EP1248164A1 EP 1248164 A1 EP1248164 A1 EP 1248164A1 EP 01201246 A EP01201246 A EP 01201246A EP 01201246 A EP01201246 A EP 01201246A EP 1248164 A1 EP1248164 A1 EP 1248164A1
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EP
European Patent Office
Prior art keywords
wheel
movement
roadway
barrel
barrel wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01201246A
Other languages
German (de)
French (fr)
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EP1248164B1 (en
Inventor
Marco Bettelini
Theodor Schoenenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ETA SA Manufacture Horlogere Suisse, Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical ETA SA Manufacture Horlogere Suisse
Priority to DE2001612036 priority Critical patent/DE60112036T2/en
Priority to EP20010201246 priority patent/EP1248164B1/en
Publication of EP1248164A1 publication Critical patent/EP1248164A1/en
Application granted granted Critical
Publication of EP1248164B1 publication Critical patent/EP1248164B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • 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
    • G04B19/02—Back-gearing arrangements between gear train and hands

Definitions

  • the present invention relates to a movement for a timepiece comprising a plate, a needle display device, a gear train connecting drive means to said needles, said train comprising a wheel drive engaged at least indirectly with said drive means and integral with a roadway pivoting on a tenon mounted in a gear train, a cannon wheel arranged on the roadway and pivoted on the plate, the wheel drive and the barrel wheel extending on either side of said plate.
  • Figure 1 schematically represents part of a movement with second in the center as described in the prior art.
  • This figure 1 lets appear the relative positions of the time display mobiles.
  • a second mobile 101 pivotally mounted in a stone 102, itself driven out in a gear train 103.
  • the axis 104 of the second mobile is arranged in a center tube 105, said center tube 105 being driven through a plate 106.
  • the second axis 104 has, in its middle part, an annular bulge 107 having a diameter substantially equal to the inside diameter of the center tube 105.
  • Said center tube 105 thus fulfills the function of radial guide for the axis of second 104.
  • the pavement 108 is rotatably mounted on said center tube 105, the base of the pavement 108 resting on the top of the plate 106. It may be noted that the center tube 105 also fulfills a radial guide function for the roadway 108.
  • the pinion of the roadway 109 meshes with a timer wheel 110, secured to a timer pinion 111 which meshes with a barrel wheel 112.
  • Said gun wheel 112 is rotatably mounted on pavement 108 which therefore serves it radial guide.
  • FIG. 1 A first drawback that presents such a type of movement appears FIG. 1 and relates to manufacturers of timepiece movements, in especially when they deliver these movements to customers who then follow them in watch cases of their choice.
  • the cannon wheel is disposed on said plate, therefore outside the movement.
  • said barrel wheel since said barrel wheel must be free to rotate around the roadway, it is typically simply "strung" on said roadway, and therefore free axially. As a result, the barrel wheel is likely to come off its taken with the timer pinion during transport from the manufacturer of movement at his client's. More specifically, during the assembly process of the timepiece, the dial is generally pressed on the movement.
  • the teeth of the barrel wheel can deform due to their pressure against the timer gear.
  • the wheel barrel is sometimes made of plastic and its teeth may then become break when fitting the dial, if the toothing of the barrel wheel is not engaged correct with that of the timer pinion.
  • the customer is obliged, before installing the dial, to carry out an automatic or manual control of the correct positioning of the barrel wheel if he does not want to risk malfunctions of the part watchmaking following damage to the movement. This control step essential leads to an increase in the duration and cost of manufacturing the final product.
  • the cannon wheel can disengage entirely from the roadway and lose during transport of movements to the nesting station, which also generates additional production costs.
  • a known solution of the prior art to remedy this problem consists in: add a washer to the pavement tube once the barrel wheel is set place, so as to block the latter axially.
  • this solution presents a disadvantage in that it requires the manufacture of an additional part, typically a washer, and the implementation of an additional step in the movement mounting method, to install said washer.
  • the main object of the present invention is therefore to overcome the drawbacks of the aforementioned prior art by providing a movement for a timepiece, making it possible in particular to ensure that the barrel wheel remains in engagement with the timer pinion during movement movements before operation casing.
  • the invention relates to a movement for a timepiece of the type mentioned above, characterized by the fact that the cannon wheel and the roadway respectively comprise complementary means for axially retaining the cannon wheel on the roadway.
  • the structure according to the invention makes it possible to prevent the barrel wheel from coming off the pavement during the transport stage and therefore it is lost or damaged during the installation of the dial, while removing the mentioned control step previously.
  • An additional advantage of the invention comes from the fact that the means of barrel wheel retainer on the pavement tube are integral parts of these two elements. The realization of the retaining means therefore does not require the setting implementation of an additional step, as such, in the manufacturing process movement.
  • said means for retainers are of the notch type. They may in particular include a bead and a complementary grooves, respectively formed on the barrel wheel tube and on the road tube, for example.
  • An additional advantage of the present invention is that said bead is produced by an excess thickness of material on the tube of the wheel barrel, said excess thickness being situated substantially at the level at which the needle of the hours is then chased. Indeed, chasing a needle generally gives creep of material on its support which can increase over time. This phenomenon can cause the needle to play with its support, or even the detachment of the needle from its support. Thanks to the tube structure of the wheel gun according to the invention, in particular by virtue of said excess thickness, the flow of material on the tube is limited and good maintenance of the hour hand is ensured in the time.
  • the present invention therefore also aims to overcome the drawbacks of the aforementioned prior art by providing a movement for a timepiece with an acceptable quality of manufacture at a low cost price.
  • the invention also relates to a movement for coin of the type mentioned above, characterized in that it does not include center tube and an annular shoulder is provided on the plate of the movement serving as a radial guide for the cannon wheel.
  • a movement for coin of the type mentioned above characterized in that it does not include center tube and an annular shoulder is provided on the plate of the movement serving as a radial guide for the cannon wheel.
  • the various uncertainties mentioned above have been partly dissociated insofar as the roadway no longer fulfills the function of a radial guide for the barrel wheel. Therefore, the radial clearance existing at the level of the barrel wheel does not absolutely not dependent on the radial uncertainties inherent in the manufacture of the mobile second and pavement. Thus, the radial clearance of the axis of rotation of the needle of the hours can be appropriately controlled, regardless of the existing uncertainties on the second mobile and the road.
  • the barrel wheel 1 has a structure conventional.
  • Three radial extensions 2 connect the toothed wheel 3 to the barrel 4.
  • three arms 5 substantially in the form of arcs of a circle, each extending from one of said radial extensions 2. These arms 5 have the function of regulating the axial positioning relative of the cannon wheel 1 and the roadway (not shown in this figure) thus eliminating the need for a tinsel spring, usually used for perform this function.
  • Figure 2 also shows the special characteristics of the barrel wheel 1, namely the fact that the inside of its barrel 4 has a bead ring finger 6.
  • Figure 3 provides a better understanding of the advantage of said bead 6 since it is shown in its service position, that is to say when the wheel 1 is located on pavement 7.
  • the movement for a timepiece partially visible in this figure is of type with central second.
  • the cog bridge 8 carries stones 10, in which are pivotally mounted mobile.
  • the second mobile 11 is driven by an exhaust pinion (not shown) via the second wheel 13.
  • the second pinion 14 meshes with a medium wheel (not shown) secured to a medium gear (not shown) being engaged with the drive wheel 15, mounted at friction on the roadway 7.
  • the roadway 7, arranged directly on the mobile of second 11, then transmits its rotational movement to timer 12 via the wheel timer 16.
  • the radial guidance of the roadway 7 is carried out directly by the second mobile 11, via two annular beads 17 formed on the axis of second 18.
  • the timer pinion 19, passing through an orifice 20 formed through the plate 9, is engaged with the barrel wheel 1, disposed on top of said cage, and communicates its rotational movement to it.
  • said barrel wheel 1 is mounted free to rotate on the roadway 7.
  • the barrel wheel 1 and the roadway 7 comprise respectively complementary means for axially retaining said wheel at cannon 1 on carriageway 7, in particular during the transport stages.
  • Said means complementary are of the notched type, more precisely, the roadway tube 21 comprises opposite the bead 6 of the barrel wheel 1 an annular groove 22 of complementary form.
  • the external face of the plate 9 further comprises an annular shoulder 23 serving as a radial positioning guide for said barrel wheel 1.
  • the barrel wheel 1 is placed on the roadway 7 by "clipping", that is to say by elastic deformation of material.
  • the cannon wheel 1 is first threaded onto the roadway 7 until the bead 6 of the wheel barrel abuts on a bead 23 located immediately above the groove 22 of the pavement tube 21.
  • a slight pressure on the barrel wheel 1 causes the elastic deformation of the barrel 4, allowing the bead 6 to cross said bead 23 and to be received in the groove 22, which ensures the establishment of said barrel wheel 1 on the plate 9.
  • said wheel Cannon 1 cannot disengage itself from its location during transport.
  • the step of setting up the cannon wheel 1 on the roadway 7 does not does not require modification of the conventional mounting method, due to the simplicity and ingenuity of the retaining means 6, 22.
  • the annular bead 6 formed in the tube 4 of the barrel wheel 1 is constituted by an excess thickness of material and not simply by deformation. This characteristic has the important consequence that the material creep which takes place, at the time of the fitting of the hour hand (not shown), is located at said extra thickness. The deformation undergone by the barrel wheel 1 during this mounting step is therefore limited to this region. Of more, once the needle in place, the material creep continues slowly during of time and the existence of said allowance, arranged at the same level as the needle, gives the needle positioning better resistance over time than in the case of a conventional barrel wheel tube.
  • the timer mobile 12 is preferably made of steel, brass or plastic, while the roadway 7 is made of steel or brass and that the barrel wheel 1 is made of material plastic, such as polyoxymethylene or a polyacetal.
  • material plastic such as polyoxymethylene or a polyacetal.
  • the barrel wheel 1 is guided radially by an annular shoulder 23 formed on the top of the plate 9 and no longer by pavement 7, as is typically the case in the prior art.
  • the having significant uncertainties on the radial dimensions of the axis of second 18 and of the roadway tube 21 no longer influences the free rotation of the barrel wheel 1 thanks to the structure according to the invention, visible in FIG. 3.
  • This particularity allows the manufacturer to settle for relatively high tolerances with regard to the radial dimensions of the second axis 18, of the tube pavement 21 and tube 4 of the cannon wheel 1.
  • This technical advantage contributes also to lower the cost price of the movement according to the invention and allows thus to realize cheap movements.
  • the movement described here is of the type with center seconds but we can obviously adapt the structure according to the invention to a movement without seconds in the center, where the second mobile is simply replaced by a central tenon.

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

Abstract

The movement for driving the time piece hands includes a barrel wheel (1) which fits over a shoe (7). The barrel wheel has a protruding rim (6) on the inside of the tube which is pressed over a complementary rim on the outside of the shoe during assembly to rest in a throat (22) and remain firmly locked in position

Description

La présente invention concerne un mouvement pour pièce d'horlogerie comportant une platine, un dispositif d'affichage à aiguilles, un train d'engrenages reliant des moyens d'entraínement auxdites aiguilles, ledit train comportant une roue d'entraínement en prise au moins indirectement avec lesdits moyens d'entraínement et solidaire d'une chaussée pivotant sur un tenon monté dans un pont de rouage, une roue à canon disposée sur la chaussée et pivotée sur la platine, la roue d'entraínement et la roue à canon s'étendant de part et d'autre de ladite platine.The present invention relates to a movement for a timepiece comprising a plate, a needle display device, a gear train connecting drive means to said needles, said train comprising a wheel drive engaged at least indirectly with said drive means and integral with a roadway pivoting on a tenon mounted in a gear train, a cannon wheel arranged on the roadway and pivoted on the plate, the wheel drive and the barrel wheel extending on either side of said plate.

Ce type de mouvement pour pièce d'horlogerie est courant et connu depuis longtemps. Cependant, on peut noter que les mouvements de l'art antérieur présentent certains inconvénients, auxquels la présente invention permet de remédier.This type of movement for a timepiece is common and known since long time. However, it can be noted that the movements of the prior art have certain drawbacks, which the present invention overcomes.

La figure 1 représente de façon schématique une partie d'un mouvement avec seconde au centre tel que décrit dans l'art antérieur. Cette figure 1 laisse apparaítre les positions relatives des mobiles d'affichage de l'heure. En particulier, on distingue un mobile de seconde 101 monté à pivot dans une pierre 102, elle-même chassée dans un pont de rouage 103. L'axe 104 du mobile de seconde est disposé dans un tube de centre 105, ledit tube de centre 105 étant chassé au travers d'une platine 106. L'axe de seconde 104 comporte, dans sa partie médiane, un renflement annulaire 107 présentant un diamètre sensiblement égal au diamètre intérieur du tube de centre 105. Ledit tube de centre 105 remplit ainsi la fonction de guide radial pour l'axe de seconde 104. La chaussée 108 est montée tournante sur ledit tube de centre 105, la base de la chaussée 108 reposant sur le dessus de la platine 106. On peut noter que le tube de centre 105 remplit également une fonction de guide radial pour la chaussée 108. Le pignon de la chaussée 109 engrène avec une roue de minuterie 110, solidaire d'un pignon de minuterie 111 lequel engrène avec une roue à canon 112. Ladite roue à canon 112 est montée tournante sur la chaussée 108 qui lui sert donc de guide radial.Figure 1 schematically represents part of a movement with second in the center as described in the prior art. This figure 1 lets appear the relative positions of the time display mobiles. In particular, we distinguish a second mobile 101 pivotally mounted in a stone 102, itself driven out in a gear train 103. The axis 104 of the second mobile is arranged in a center tube 105, said center tube 105 being driven through a plate 106. The second axis 104 has, in its middle part, an annular bulge 107 having a diameter substantially equal to the inside diameter of the center tube 105. Said center tube 105 thus fulfills the function of radial guide for the axis of second 104. The pavement 108 is rotatably mounted on said center tube 105, the base of the pavement 108 resting on the top of the plate 106. It may be noted that the center tube 105 also fulfills a radial guide function for the roadway 108. The pinion of the roadway 109 meshes with a timer wheel 110, secured to a timer pinion 111 which meshes with a barrel wheel 112. Said gun wheel 112 is rotatably mounted on pavement 108 which therefore serves it radial guide.

Un premier inconvénient que présente un tel type de mouvement apparaít de la figure 1 et concerne les fabricants de mouvements de pièces d'horlogerie, en particulier lorsqu'ils livrent ces mouvements à des clients qui les emboítent ensuite dans des boítes de montre de leur choix. En effet, de manière conventionnelle, tandis que l'ensemble des rouages du mouvement est enfermé entre une platine et des ponts, la roue à canon est disposé sur ladite platine, donc à l'extérieur du mouvement. De plus, étant donné que ladite roue à canon doit être libre de tourner autour de la chaussée, elle est typiquement simplement "enfilée" sur ladite chaussée, et donc libre axialement. Par conséquent, la roue à canon est susceptible de se dégager de sa prise avec le pignon de minuterie pendant le transport depuis le fabricant de mouvement chez son client. Plus précisément, au cours du procédé de montage de la pièce d'horlogerie, le cadran est généralement pressé sur le mouvement. Si, lors de cette étape, la roue à canon n'est pas correctement en prise avec le pignon de minuterie, les dents de la roue à canon peuvent se déformer du fait de leur pression contre le pignon de minuterie. Dans le cas de mouvements bon marché, la roue à canon est parfois réalisée en matière plastique et ses dents risquent alors de se casser lors de la pose du cadran, si la denture de la roue à canon n'est pas en prise correcte avec celle du pignon de minuterie. Le client est obligé, avant la pose du cadran, de procéder à un contrôle automatique ou manuel du bon positionnement de la roue à canon s'il ne veut pas risquer des dysfonctionnements de la pièce d'horlogerie, suite à des dommages causés au mouvement. Cette étape de contrôle incontournable entraíne une augmentation de la durée et du coût de la fabrication du produit fini.A first drawback that presents such a type of movement appears FIG. 1 and relates to manufacturers of timepiece movements, in especially when they deliver these movements to customers who then follow them in watch cases of their choice. Indeed, conventionally, while that all the cogs of the movement are enclosed between a plate and bridges, the cannon wheel is disposed on said plate, therefore outside the movement. In addition, since said barrel wheel must be free to rotate around the roadway, it is typically simply "strung" on said roadway, and therefore free axially. As a result, the barrel wheel is likely to come off its taken with the timer pinion during transport from the manufacturer of movement at his client's. More specifically, during the assembly process of the timepiece, the dial is generally pressed on the movement. If, during this step, the barrel wheel is not properly engaged with the pinion timer, the teeth of the barrel wheel can deform due to their pressure against the timer gear. In the case of inexpensive movements, the wheel barrel is sometimes made of plastic and its teeth may then become break when fitting the dial, if the toothing of the barrel wheel is not engaged correct with that of the timer pinion. The customer is obliged, before installing the dial, to carry out an automatic or manual control of the correct positioning of the barrel wheel if he does not want to risk malfunctions of the part watchmaking following damage to the movement. This control step essential leads to an increase in the duration and cost of manufacturing the final product.

De même, la roue à canon peut se dégager entièrement de la chaussée et se perdre au cours du transport des mouvements vers le poste d'emboítage, ce qui engendre également des coûts supplémentaires de production.Likewise, the cannon wheel can disengage entirely from the roadway and lose during transport of movements to the nesting station, which also generates additional production costs.

Une solution connue de l'art antérieur pour remédier à ce problème consiste à ajouter une rondelle sur le tube de chaussée une fois que la roue à canon est mise en place, de façon à bloquer cette dernière axialement. Cette solution présente toutefois un inconvénient en ce qu'elle nécessite la fabrication d'une pièce supplémentaire, typiquement une rondelle, et la mise en oeuvre d'une étape supplémentaire dans le procédé de montage du mouvement, pour poser ladite rondelle.A known solution of the prior art to remedy this problem consists in: add a washer to the pavement tube once the barrel wheel is set place, so as to block the latter axially. However, this solution presents a disadvantage in that it requires the manufacture of an additional part, typically a washer, and the implementation of an additional step in the movement mounting method, to install said washer.

La présente invention a donc pour but principal de pallier les inconvénients de l'art antérieur susmentionnés en fournissant un mouvement pour pièce d'horlogerie, permettant notamment d'assurer un maintien en prise de la roue à canon avec le pignon de minuterie au cours du transport des mouvements avant l'opération d'emboítage.The main object of the present invention is therefore to overcome the drawbacks of the aforementioned prior art by providing a movement for a timepiece, making it possible in particular to ensure that the barrel wheel remains in engagement with the timer pinion during movement movements before operation casing.

A cet effet, l'invention a pour objet un mouvement pour pièce d'horlogerie du type mentionné plus haut, caractérisé par le fait que la roue à canon et la chaussée comprennent respectivement des moyens complémentaires pour retenir axialement la roue à canon sur la chaussée.To this end, the invention relates to a movement for a timepiece of the type mentioned above, characterized by the fact that the cannon wheel and the roadway respectively comprise complementary means for axially retaining the cannon wheel on the roadway.

La structure selon l'invention permet d'éviter que la roue à canon se dégage de la chaussée pendant l'étape de transport et donc qu'elle soit perdue ou endommagée au cours de la pose du cadran, tout en supprimant l'étape de contrôle mentionnée précédemment. The structure according to the invention makes it possible to prevent the barrel wheel from coming off the pavement during the transport stage and therefore it is lost or damaged during the installation of the dial, while removing the mentioned control step previously.

Un avantage supplémentaire de l'invention provient du fait que les moyens de retenue de la roue à canon sur le tube de chaussée font parties intégrantes de ces deux éléments. La réalisation des moyens de retenue ne nécessite donc pas la mise en oeuvre d'une étape supplémentaire, en tant que tel, dans le procédé de fabrication du mouvement.An additional advantage of the invention comes from the fact that the means of barrel wheel retainer on the pavement tube are integral parts of these two elements. The realization of the retaining means therefore does not require the setting implementation of an additional step, as such, in the manufacturing process movement.

Selon un mode de réalisation particulier de l'invention, lesdits moyens de retenue sont du type à cran. Ils peuvent notamment comporter un bourrelet et une gorge complémentaires, respectivement ménagés sur le tube de la roue à canon et sur le tube de chaussée, par exemple.According to a particular embodiment of the invention, said means for retainers are of the notch type. They may in particular include a bead and a complementary grooves, respectively formed on the barrel wheel tube and on the road tube, for example.

Un avantage supplémentaire de la présente invention réside dans le fait que ledit bourrelet est réalisé par une surépaisseur de matière sur le tube de la roue à canon, ladite surépaisseur étant située sensiblement au niveau auquel l'aiguille des heures est ensuite chassée. En effet, le chassage d'une aiguille donne généralement lieu à un fluage de matière sur son support qui peut s'accentuer avec le temps. Ce phénomène peut engendrer un jeu de l'aiguille par rapport à son support, voire le détachement de l'aiguille de son support. Grâce à la structure du tube de la roue à canon selon l'invention, en particulier grâce à ladite surépaisseur, le fluage de matière sur le tube est limité et un bon maintien de l'aiguille des heures est assuré dans le temps.An additional advantage of the present invention is that said bead is produced by an excess thickness of material on the tube of the wheel barrel, said excess thickness being situated substantially at the level at which the needle of the hours is then chased. Indeed, chasing a needle generally gives creep of material on its support which can increase over time. This phenomenon can cause the needle to play with its support, or even the detachment of the needle from its support. Thanks to the tube structure of the wheel gun according to the invention, in particular by virtue of said excess thickness, the flow of material on the tube is limited and good maintenance of the hour hand is ensured in the time.

Un autre inconvénient que présentent les mouvements de l'art antérieur tels que celui représenté sur la figure 1 concerne les tolérances de fabrication à prendre en compte pour la réalisation des différentes pièces composant le mouvement. Plus particulièrement ici, les tolérances sur les dimensions radiales du mobile de seconde 101, du tube de centre 105, de la chaussée 108 et de la roue à canon 112 ont une grande importance. En effet, ces différentes pièces doivent à la fois être libres de tourner les unes par rapport aux autres et servir de guide radial les unes pour les autres. L'inconvénient d'une telle structure est que les incertitudes sur les dimensions radiales d'une pièce, directement liées aux tolérances admises par le fabricant, vont s'ajouter aux incertitudes radiales existant sur la pièce suivante, et ainsi de suite. Globalement, la somme de toutes ces incertitudes peut conduire à un produit fini présentant une qualité de fabrication médiocre, du fait d'un jeu radial important de l'axe de rotation de l'aiguille des heures par exemple.Another drawback presented by the movements of the prior art such as that that shown in Figure 1 concerns the manufacturing tolerances to be taken into account for the realization of the various parts composing the movement. More particularly here, the tolerances on the radial dimensions of the second mobile 101, center tube 105, pavement 108 and cannon wheel 112 have a great importance. Indeed, these different parts must both be free to rotate with respect to each other and serve as a radial guide for each other. The disadvantage of such a structure is that the uncertainties on the dimensions radial of a part, directly linked to the tolerances allowed by the manufacturer, go add to the radial uncertainties existing on the next part, and so on. Overall, the sum of all these uncertainties can lead to a finished product having a poor manufacturing quality, due to a large radial clearance of the axis of rotation of the hour hand for example.

Une solution évidente permettant de remédier à ce problème consiste à réduire les tolérances admises dans la fabrication des pièces du mouvement, ce qui a pour conséquence de limiter les incertitudes radiales et donc le jeu final de l'axe de l'aiguille des heures. Cependant une limitation des tolérances, même faible, engendre des surcoûts de production importants, ce qui ne convient pas pour la fabrication de mouvements bon marché. An obvious solution to remedy this problem is to reduce the tolerances allowed in the manufacture of movement parts, which has as a consequence of limiting the radial uncertainties and therefore the final clearance of the axis of the hour hand. However, even a small limitation of tolerances results in significant additional production costs, which is not suitable for the manufacture of cheap movements.

La présente invention a donc également pour but de pallier les inconvénients de l'art antérieur susmentionnés en fournissant un mouvement pour pièce d'horlogerie présentant une qualité de fabrication acceptable à un faible prix de revient.The present invention therefore also aims to overcome the drawbacks of the aforementioned prior art by providing a movement for a timepiece with an acceptable quality of manufacture at a low cost price.

A cet effet, l'invention a également pour objet un mouvement pour pièce d'horlogerie du type mentionné plus haut, caractérisé par le fait qu'il ne comporte pas de tube de centre et qu'il est prévu un épaulement annulaire sur la platine du mouvement servant de guide radial à la roue à canon. De cette façon l'incertitude radiale globale est fortement abaissée par rapport à celle des mouvements de l'art antérieur dans la mesure où une pièce, et donc l'incertitude qui l'accompagne, ont été supprimées. Il convient de rappeler ici l'importance économique que représente le simple fait de supprimer une pièce dans un mouvement, plus particulièrement lorsqu'il s'agit d'un mouvement bon marché fabriqué à au moins plusieurs centaines de milliers voire plusieurs millions d'exemplaires.To this end, the invention also relates to a movement for coin of the type mentioned above, characterized in that it does not include center tube and an annular shoulder is provided on the plate of the movement serving as a radial guide for the cannon wheel. In this way the uncertainty overall radial is greatly lowered compared to that of art movements previous to the extent that a piece, and therefore the uncertainty that accompanies it, have been deleted. It should be recalled here the economic importance of the simple deletion of a part in a movement, especially when is a cheap movement made at least several hundred thousand even several million copies.

En outre, les diverses incertitudes susmentionnées ont été en partie dissociées dans la mesure où la chaussée ne remplit plus la fonction de guide radial pour la roue à canon. De ce fait, le jeu radial existant au niveau de la roue à canon ne dépend absolument pas des incertitudes radiales inhérentes à la fabrication du mobile de seconde et de la chaussée. Ainsi, le jeu radial de l'axe de rotation de l'aiguille des heures peut être convenablement maítrisé, indépendamment des incertitudes existant au niveau du mobile de seconde et de la chaussée.In addition, the various uncertainties mentioned above have been partly dissociated insofar as the roadway no longer fulfills the function of a radial guide for the barrel wheel. Therefore, the radial clearance existing at the level of the barrel wheel does not absolutely not dependent on the radial uncertainties inherent in the manufacture of the mobile second and pavement. Thus, the radial clearance of the axis of rotation of the needle of the hours can be appropriately controlled, regardless of the existing uncertainties on the second mobile and the road.

L'invention sera mieux comprise à l'aide de la description suivante d'un exemple d'exécution en référence aux dessins annexés dans lesquels:

  • la figure 2 est une vue de dessus d'un mode de réalisation particulier de la roue à canon selon l'invention;
  • la figure 3 est une vue en coupe transversale d'une partie du mouvement pour pièce d'horlogerie selon la ligne III-III de la figure 2.
The invention will be better understood using the following description of an exemplary embodiment with reference to the accompanying drawings in which:
  • Figure 2 is a top view of a particular embodiment of the barrel wheel according to the invention;
  • FIG. 3 is a cross-sectional view of part of the movement for a timepiece along line III-III of FIG. 2.

Comme cela apparaít sur la figure 2, la roue à canon 1 présente une structure conventionnelle. Trois extensions radiales 2 relient la roue dentée 3 au canon 4. Dans le mode de réalisation particulier représenté sur la figure 2, on constate que trois bras 5, sensiblement en forme d'arcs de cercle, s'étendent chacun à partir d'une desdites extensions radiales 2. Ces bras 5 ont pour fonction de réguler le positionnement axial relatif de la roue à canon 1 et de la chaussée (non représentée sur cette figure) permettant ainsi de se passer d'un ressort clinquant, habituellement utilisé pour assurer cette fonction.As shown in Figure 2, the barrel wheel 1 has a structure conventional. Three radial extensions 2 connect the toothed wheel 3 to the barrel 4. In the particular embodiment shown in Figure 2, we see that three arms 5, substantially in the form of arcs of a circle, each extending from one of said radial extensions 2. These arms 5 have the function of regulating the axial positioning relative of the cannon wheel 1 and the roadway (not shown in this figure) thus eliminating the need for a tinsel spring, usually used for perform this function.

La figure 2 laisse également apparaítre les caractéristiques particulières de la roue à canon 1, à savoir le fait que l'intérieur de son canon 4 comporte un bourrelet annulaire 6. Figure 2 also shows the special characteristics of the barrel wheel 1, namely the fact that the inside of its barrel 4 has a bead ring finger 6.

La figure 3 permet de mieux comprendre l'intérêt dudit bourrelet 6 puisqu'il s'y trouve représenté dans sa position de service, c'est-à-dire lorsque la roue à canon 1 est disposée sur la chaussée 7.Figure 3 provides a better understanding of the advantage of said bead 6 since it is shown in its service position, that is to say when the wheel 1 is located on pavement 7.

Le mouvement pour pièce d'horlogerie visible en partie sur cette figure est du type avec seconde au centre. On y distingue notamment un pont de rouage 8 et une platine 9 définissant une cage dans laquelle se trouve l'essentiel du mouvement. Le pont de rouage 8 porte des pierres 10, dans lesquelles sont montés à pivot des mobiles. On distingue en particulier un mobile de seconde 11 au centre et un mobile de minuterie 12. Le mobile de seconde 11 est entraíné par un pignon d'échappement (non représenté) par le biais de la roue de seconde 13. Le pignon de seconde 14 engrène avec une roue moyenne (non représentée) solidaire d'un pignon de moyenne (non représenté) se trouvant en prise avec la roue d'entraínement 15, montée à friction sur la chaussée 7. La chaussée 7, disposée directement sur le mobile de seconde 11, transmet alors son mouvement de rotation à la minuterie 12 via la roue de minuterie 16. Le guidage radial de la chaussée 7 est réalisé directement par le mobile de seconde 11, via deux bourrelets annulaires 17 ménagés sur l'axe de seconde 18. Le pignon de minuterie 19, traversant un orifice 20 ménagé à travers la platine 9, est en prise avec la roue à canon 1, disposée sur le dessus de ladite cage, et lui communique son mouvement de rotation.The movement for a timepiece partially visible in this figure is of type with central second. There are notably a gear train bridge 8 and a plate 9 defining a cage in which most of the movement is located. The cog bridge 8 carries stones 10, in which are pivotally mounted mobile. There is in particular a second 11 mobile in the center and a mobile timer 12. The second mobile 11 is driven by an exhaust pinion (not shown) via the second wheel 13. The second pinion 14 meshes with a medium wheel (not shown) secured to a medium gear (not shown) being engaged with the drive wheel 15, mounted at friction on the roadway 7. The roadway 7, arranged directly on the mobile of second 11, then transmits its rotational movement to timer 12 via the wheel timer 16. The radial guidance of the roadway 7 is carried out directly by the second mobile 11, via two annular beads 17 formed on the axis of second 18. The timer pinion 19, passing through an orifice 20 formed through the plate 9, is engaged with the barrel wheel 1, disposed on top of said cage, and communicates its rotational movement to it.

On distingue nettement sur la figure 3 que ladite roue à canon 1 est montée libre à rotation sur la chaussée 7. La roue à canon 1 et la chaussée 7 comportent respectivement des moyens complémentaires pour retenir axialement ladite roue à canon 1 sur la chaussée 7, notamment lors des étapes de transport. Lesdits moyens complémentaires sont du type à cran, plus précisément, le tube de chaussée 21 comporte en regard du bourrelet 6 de la roue à canon 1 une gorge annulaire 22 de forme complémentaire.We can clearly see in Figure 3 that said barrel wheel 1 is mounted free to rotate on the roadway 7. The barrel wheel 1 and the roadway 7 comprise respectively complementary means for axially retaining said wheel at cannon 1 on carriageway 7, in particular during the transport stages. Said means complementary are of the notched type, more precisely, the roadway tube 21 comprises opposite the bead 6 of the barrel wheel 1 an annular groove 22 of complementary form.

La face externe de la platine 9 comporte en outre un épaulement annulaire 23 servant de guide de positionnement radial à ladite roue à canon 1.The external face of the plate 9 further comprises an annular shoulder 23 serving as a radial positioning guide for said barrel wheel 1.

On comprend que la roue à canon 1 est mise en place sur la chaussée 7 par "clipsage", c'est-à-dire par déformation élastique de matière. En effet, la roue à canon 1 est d'abord enfilée sur la chaussée 7 jusqu'à ce que le bourrelet 6 de la roue à canon bute sur un bourrelet 23 situé immédiatement au-dessus de la gorge 22 du tube de chaussée 21. A ce stade, une légère pression sur la roue à canon 1 entraíne la déformation élastique du canon 4, permettant au bourrelet 6 de franchir ledit bourrelet 23 et de venir se loger dans la gorge 22, ce qui assure la mise en place de ladite roue à canon 1 sur la platine 9. Ceci a pour conséquence que ladite roue à canon 1 ne peut se dégager toute seule de son emplacement lors de son transport. On peut noter que l'étape de mise en place de la roue à canon 1 sur la chaussée 7 ne nécessite pas de modification du procédé de montage classique, du fait de la simplicité et de l'ingéniosité des moyens de retenue 6, 22.It is understood that the barrel wheel 1 is placed on the roadway 7 by "clipping", that is to say by elastic deformation of material. The cannon wheel 1 is first threaded onto the roadway 7 until the bead 6 of the wheel barrel abuts on a bead 23 located immediately above the groove 22 of the pavement tube 21. At this stage, a slight pressure on the barrel wheel 1 causes the elastic deformation of the barrel 4, allowing the bead 6 to cross said bead 23 and to be received in the groove 22, which ensures the establishment of said barrel wheel 1 on the plate 9. This has the consequence that said wheel Cannon 1 cannot disengage itself from its location during transport. It can be noted that the step of setting up the cannon wheel 1 on the roadway 7 does not does not require modification of the conventional mounting method, due to the simplicity and ingenuity of the retaining means 6, 22.

On peut noter un détail supplémentaire de la structure de la roue à canon 1. Comme cela a été signalé précédemment, le bourrelet annulaire 6 ménagé dans le tube 4 de la roue à canon 1 est constitué par une surépaisseur de matière et non simplement par déformation. Cette caractéristique a pour conséquence importante que le fluage de matière qui a lieu, au moment de la pose de l'aiguille des heures (non représentée), est localisé au niveau de ladite surépaisseur. La déformation subie par la roue à canon 1 lors de cette étape de montage se limite donc à cette région. De plus, une fois l'aiguille en place, le fluage de matière se poursuit lentement au cours du temps et l'existence de ladite surépaisseur, disposée au même niveau que l'aiguille, confère au positionnement de l'aiguille une meilleure tenue dans le temps que dans le cas d'un tube de roue à canon classique.We can note an additional detail of the structure of the barrel wheel 1. As previously reported, the annular bead 6 formed in the tube 4 of the barrel wheel 1 is constituted by an excess thickness of material and not simply by deformation. This characteristic has the important consequence that the material creep which takes place, at the time of the fitting of the hour hand (not shown), is located at said extra thickness. The deformation undergone by the barrel wheel 1 during this mounting step is therefore limited to this region. Of more, once the needle in place, the material creep continues slowly during of time and the existence of said allowance, arranged at the same level as the needle, gives the needle positioning better resistance over time than in the case of a conventional barrel wheel tube.

On peut également prévoir, selon une variante de réalisation, d'inverser ladite structure de fixation à cran en ménageant le bourrelet 6 sur la chaussée 7 et la gorge 22 sur la roue à canon 1, bien que cette alternative soit moins avantageuse que celle décrite ci-dessus. En effet, dans ce cas de figure, l'avantage, décrit ci-dessus, provenant de l'existence d'une surépaisseur de matière sur le tube 4 de la roue à canon 1 est perdu, ce qui a pour conséquence une diminution du bon maintien de l'aiguille des heures au cours du temps.It is also possible, according to an alternative embodiment, to reverse said notch fixing structure by providing the bead 6 on the roadway 7 and the groove 22 on the barrel wheel 1, although this alternative is less advantageous than that described above. Indeed, in this case, the advantage, described above, from the existence of an excess thickness of material on the tube 4 of the wheel barrel 1 is lost, which results in a decrease in the good maintenance of the hour hand over time.

Selon un mode particulier de réalisation, le mobile de minuterie 12 est préférentiellement réalisé en acier, laiton ou matière plastique, tandis que la chaussée 7 est réalisée en acier ou laiton et que la roue à canon 1 est réalisée en matière plastique, tel que du polyoxyméthylène ou un polyacétal. Ces exemples de matériaux ne sont, bien entendu, pas limitatifs et l'homme de l'art pourra employer tout autre matériau susceptible d'assurer les mêmes fonctions.According to a particular embodiment, the timer mobile 12 is preferably made of steel, brass or plastic, while the roadway 7 is made of steel or brass and that the barrel wheel 1 is made of material plastic, such as polyoxymethylene or a polyacetal. These examples of materials are, of course, not limitative and those skilled in the art may employ any other material capable of performing the same functions.

Il convient de remarquer en outre les caractéristiques particulières du mouvement pour pièce d'horlogerie selon l'invention, également visibles sur la figure 3. On peut tout d'abord noter que du fait de l'absence de tube de centre, l'incertitude sur les dimensions radiales liée à cette pièce est supprimée par rapport aux mouvements de l'art antérieur comportant un tube de centre. Le fait d'avoir une pièce de moins par rapport aux mouvements de l'art antérieur constitue également un avantage d'ordre économique dans la mesure où cela contribue à abaisser le prix de revient du mouvement. Cette économie comporte deux aspects, puisque d'une part le fabricant doit fabriquer une pièce de moins qu'à son habitude et que d'autre part le procédé de montage comporte une étape de moins.In addition, the special characteristics of the movement for a timepiece according to the invention, also visible in the figure 3. We can first note that due to the absence of a center tube, the uncertainty on the radial dimensions linked to this part is deleted compared to movements of the prior art comprising a center tube. Having a room less compared to the movements of the prior art also constitutes a economic benefit to the extent that it helps lower the price of comes back from the movement. This economy has two aspects, since on the one hand the manufacturer has to produce one less piece than usual and on the other hand assembly process involves one less step.

En outre, comme cela a été décrit plus haut, la roue à canon 1 est guidée radialement par un épaulement annulaire 23 ménagé sur le dessus de la platine 9 et non plus par la chaussée 7, comme c'est typiquement le cas dans l'art antérieur. Le fait d'avoir des incertitudes importantes sur les dimensions radiales de l'axe de seconde 18 et du tube de chaussée 21 n'a plus d'influence sur la libre rotation de la roue à canon 1 grâce à la structure selon l'invention, visible sur la figure 3. Cette particularité permet au fabricant de se contenter de tolérances relativement élevées en ce qui concerne les dimensions radiales de l'axe de seconde 18, du tube de chaussée 21 et du tube 4 de la roue à canon 1. Cet avantage technique contribue également à abaisser le prix de revient du mouvement selon l'invention et permet ainsi de réaliser des mouvements bon marché.In addition, as described above, the barrel wheel 1 is guided radially by an annular shoulder 23 formed on the top of the plate 9 and no longer by pavement 7, as is typically the case in the prior art. The having significant uncertainties on the radial dimensions of the axis of second 18 and of the roadway tube 21 no longer influences the free rotation of the barrel wheel 1 thanks to the structure according to the invention, visible in FIG. 3. This particularity allows the manufacturer to settle for relatively high tolerances with regard to the radial dimensions of the second axis 18, of the tube pavement 21 and tube 4 of the cannon wheel 1. This technical advantage contributes also to lower the cost price of the movement according to the invention and allows thus to realize cheap movements.

La description qui précède correspond à des modes de réalisation préférés de l'invention et ne saurait en aucun cas être considérée comme limitative, en ce qui concerne plus particulièrement la nature des matériaux utilisés.The foregoing description corresponds to preferred embodiments of the invention and can in no way be considered as limiting, with regard to relates more particularly to the nature of the materials used.

En outre, le mouvement décrit ici est du type avec seconde au centre mais on peut évidemment adapter la structure selon l'invention à un mouvement sans seconde au centre, où le mobile de seconde est simplement remplacé par un tenon central.In addition, the movement described here is of the type with center seconds but we can obviously adapt the structure according to the invention to a movement without seconds in the center, where the second mobile is simply replaced by a central tenon.

On comprendra que l'invention n'est nullement limitée à cette seule réalisation et qu'elle peut avantageusement être appliquée à toute pièce d'horlogerie électronique ou électromécanique comportant au moins un affichage du type analogique.It will be understood that the invention is in no way limited to this alone realization and that it can advantageously be applied to any timepiece electronic or electromechanical with at least one display of the type analog.

Claims (8)

Mouvement pour pièce d'horlogerie comportant une platine (9), un dispositif d'affichage à aiguilles, un train d'engrenages reliant des moyens d'entraínement (1, 7, 11, 12) auxdites aiguilles, ledit train comportant une roue d'entraínement (15) en prise au moins indirectement avec lesdits moyens d'entraínement et solidaire d'une chaussée (7) pivotant sur un tenon (18) monté dans un pont de rouage (8), une roue à canon (1) disposée sur la chaussée (7) et pivotée sur la platine (9), la roue d'entraínement (15) et la roue à canon (1) s'étendant de part et d'autre de ladite platine (9), caractérisé en ce que la roue à canon (1) et la chaussée (7) comprennent respectivement des moyens complémentaires (6, 22) pour retenir axialement la roue à canon (1) sur la chaussée (7).Movement for a timepiece comprising a plate (9), a display device with needles, a train of gears connecting drive means (1, 7, 11, 12) to said hands, said train comprising a wheel of 'drive (15) engaged at least indirectly with said drive means and integral with a roadway (7) pivoting on a tenon (18) mounted in a gear train (8), a cannon wheel (1) disposed on the roadway (7) and pivoted on the plate (9), the drive wheel (15) and the barrel wheel (1) extending on either side of said plate (9), characterized in that that the gun wheel (1) and the roadway (7) respectively comprise complementary means (6, 22) for axially retaining the gun wheel (1) on the roadway (7). Mouvement pour pièce d'horlogerie selon la revendication 1, caractérisé en ce que lesdits moyens de retenue (6, 22) sont du type à cran.Movement for a timepiece according to claim 1, characterized in that said retaining means (6, 22) are of the notch type. Mouvement pour pièce d'horlogerie selon la revendication 2, caractérisé en ce que lesdits moyens de retenue comportent un bourrelet (6) et une gorge (22) annulaires complémentaires dont l'un est ménagé sur la chaussée (7) et l'autre sur la roue à canon (1).Movement for a timepiece according to claim 2, characterized in that said retaining means comprise a bead (6) and a complementary annular groove (22), one of which is provided on the roadway (7) and the other on the barrel wheel (1). Mouvement pour pièce d'horlogerie selon la revendication 3, caractérisé en ce que ledit bourrelet (6) et ladite gorge (22) sont respectivement ménagés sur la roue à canon (1) et sur la chaussée (7).Movement for a timepiece according to claim 3, characterized in that said bead (6) and said groove (22) are respectively provided on the barrel wheel (1) and on the roadway (7). Mouvement pour pièce d'horlogerie selon la revendication 3 ou 4, caractérisé en ce que ledit bourrelet annulaire (6) est constitué par une surépaisseur de matière de la roue à canon (1).Movement for a timepiece according to claim 3 or 4, characterized in that said annular bead (6) consists of an excess thickness of material of the barrel wheel (1). Mouvement pour pièce d'horlogerie selon l'une quelconque des revendications précédentes, caractérisé en ce que la platine (9) comporte un épaulement annulaire (23) servant de guide radial à la roue à canon (1).Movement for a timepiece according to any one of the preceding claims, characterized in that the plate (9) has an annular shoulder (23) serving as a radial guide for the barrel wheel (1). Mouvement pour pièce d'horlogerie selon l'une quelconque des revendications précédentes, caractérisé en ce que la roue à canon (1) est réalisée en matière plastique.Movement for a timepiece according to any one of the preceding claims, characterized in that the barrel wheel (1) is made of plastic. Mouvement pour pièce d'horlogerie selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en outre un mobile de seconde (11) et en ce que ledit tenon est l'axe (18) dudit mobile de seconde (11).Movement for a timepiece according to one of the preceding claims, characterized in that it further comprises a second mobile (11) and in that said pin is the axis (18) of said second mobile (11) .
EP20010201246 2001-04-03 2001-04-03 Clockwork Expired - Lifetime EP1248164B1 (en)

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DE2001612036 DE60112036T2 (en) 2001-04-03 2001-04-03 clockwork
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN110083045A (en) * 2018-11-10 2019-08-02 福州小神龙表业技术研发有限公司 A kind of clock and watch minute wheel structure and its minute wheel pipe manufacturing method
EP3896533A1 (en) * 2020-04-17 2021-10-20 Patek Philippe SA Genève Bush for a timepiece hand

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3185089B1 (en) * 2015-12-21 2019-03-06 ETA SA Manufacture Horlogère Suisse Motor module for a watch

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CH212585A (en) * 1940-03-28 1940-11-30 Longines Montres Comp D Chronograph watch mechanism.
FR2433194A1 (en) * 1978-08-11 1980-03-07 Inst Chasovoi Promyshlennost ELECTRONIC WATCH REDUCER WITH STEPPER MOTOR AND CENTRAL SECOND HAND
US4636087A (en) * 1985-01-29 1987-01-13 Casio Computer Co., Ltd. Gear train mechanism stop device of timepiece
US5155712A (en) * 1992-04-20 1992-10-13 Timex Corporation Wheel and pinion assembly with friction drive/slip coupling for a timepiece

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH212585A (en) * 1940-03-28 1940-11-30 Longines Montres Comp D Chronograph watch mechanism.
FR2433194A1 (en) * 1978-08-11 1980-03-07 Inst Chasovoi Promyshlennost ELECTRONIC WATCH REDUCER WITH STEPPER MOTOR AND CENTRAL SECOND HAND
US4636087A (en) * 1985-01-29 1987-01-13 Casio Computer Co., Ltd. Gear train mechanism stop device of timepiece
US5155712A (en) * 1992-04-20 1992-10-13 Timex Corporation Wheel and pinion assembly with friction drive/slip coupling for a timepiece

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110083045A (en) * 2018-11-10 2019-08-02 福州小神龙表业技术研发有限公司 A kind of clock and watch minute wheel structure and its minute wheel pipe manufacturing method
EP3896533A1 (en) * 2020-04-17 2021-10-20 Patek Philippe SA Genève Bush for a timepiece hand

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DE60112036D1 (en) 2005-08-25
EP1248164B1 (en) 2005-07-20
DE60112036T2 (en) 2006-06-01

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