EP1211578B1 - Assembling by piling a plurality of modules forming an electromagnetic device, in particular for an ultra thin time piece - Google Patents

Assembling by piling a plurality of modules forming an electromagnetic device, in particular for an ultra thin time piece Download PDF

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Publication number
EP1211578B1
EP1211578B1 EP00204244A EP00204244A EP1211578B1 EP 1211578 B1 EP1211578 B1 EP 1211578B1 EP 00204244 A EP00204244 A EP 00204244A EP 00204244 A EP00204244 A EP 00204244A EP 1211578 B1 EP1211578 B1 EP 1211578B1
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EP
European Patent Office
Prior art keywords
assembly
timepiece
modules
thickness
mounting pins
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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.)
Expired - Lifetime
Application number
EP00204244A
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German (de)
French (fr)
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EP1211578A1 (en
Inventor
Baptist Wyssbrod
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ETA SA Manufacture Horlogere Suisse
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ETA SA Manufacture Horlogere Suisse
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Priority to EP00204244A priority Critical patent/EP1211578B1/en
Priority to AT00204244T priority patent/ATE478364T1/en
Priority to DE60044850T priority patent/DE60044850D1/en
Publication of EP1211578A1 publication Critical patent/EP1211578A1/en
Application granted granted Critical
Publication of EP1211578B1 publication Critical patent/EP1211578B1/en
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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
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/008—Mounting, assembling of components

Definitions

  • the present invention relates generally to a stack assembly of a plurality of modules comprising an electronic or electromechanical device. More particularly, the present invention relates to an ultra-thin timepiece comprising such an assembly.
  • Stack assemblies of a plurality of mechanical, electronic and / or electromechanical modules are known to those skilled in the art. Such assemblies are particularly used in the field of watchmaking to bind in the form of a stack the different modules composing the movement of a timepiece, such as a plate, an electronic module including a printed circuit bearing various electronic and electrical components of the timepiece, and, where appropriate, a support carrying one or more drive means of a timer mechanism.
  • a solution for performing such an assembly consists for example of stacking the various modules on the tenons of fixation, then to make integral all, for example by riveting, that is to say by plastic deformation of the end of the fixing lugs.
  • Such a solution is particularly advantageous because the assembly of the various components of the modules can be done very easily and can in particular be performed automatically or semi-automatically.
  • Such assembly by stacking modules nevertheless has a disadvantage in that the vertical accuracy of the assembly is dependent on the accuracy and manufacturing tolerances of the various modules assembled, including the thickness of the elements constituting them. Although it is relatively easy to manufacture certain components with a determined thickness having low tolerances, such precision and low tolerances can not be guaranteed for each assembled module. In particular, those skilled in the art encounter great difficulties in manufacturing printed circuits whose thickness is guaranteed in a reduced range of tolerances. If the person skilled in the art wishes to manufacture a timepiece by incorporating a stack assembly of modules as described above, assembly of which at least one module comprises an element of highly variable thickness, such as an electronic module comprising a circuit When printed, it will not be able to guarantee sufficient precision and assembly tolerances for certain applications where such precision is a necessity.
  • the document EP0907116 Applicant discloses a fixing device on the bottom of a housing comprising a stud with a deformable distal portion. This device allows a more secure fixation without requiring welding, but can not meet strict criteria of precision and assembly tolerances for a stack of modules.
  • the object of the present invention is therefore to propose a stack assembly of various modules comprising an electronic or electromechanical device, such as a movement of a timepiece, which makes it possible to take into account thickness variations of at least one constituent element of the assembled modules to ensure that the assembly has a determined thickness in a reduced range of tolerances.
  • the present invention also aims to provide such an assembly which does not imply a substantial complication of the assembly process and does not increase the manufacturing costs of the assembled device.
  • the present invention thus relates to a stack assembly of a plurality of modules comprising an electronic or electromechanical device, the characteristics of which are set forth in claim 1.
  • the present invention also relates to an electronic or electromechanical timepiece comprising such an assembly and whose characteristics are set out in the dependent claim 5.
  • various modules making up an electromechanical timepiece are assembled in this way in order to ensure that the thickness of the whole has a high accuracy, in particular to ensure a determined game at the various mobile, such as the medium and intermediate wheels and / or the timer wheels of the movement of the timepiece, which game is necessary to allow proper operation of the movement.
  • the assembly according to the present invention is notably used for the purpose of making an ultra-thin timepiece.
  • an advantage of the present invention lies in particular in its simplicity of implementation.
  • an intermediate element of tubular shape hereinafter referred to as a stage tube, is mounted on the fastening lugs of the assembly, this stage tube being inserted into the assembly opening assembled element whose thickness is not guaranteed so as to maintain this element in support in the assembly.
  • This stage tube has first and second reference surfaces separated by a predetermined distance and against which the assembly is supported.
  • the intermediate element has, between its two reference surfaces, a zone penetrating preferably plastically in the element concerned, the length of this zone (in the assembly direction) being such that it makes it possible to absorb the variations of thickness of this element.
  • the two faces of the element whose thickness is not guaranteed do not both come to bear on the neighboring modules so that the thickness of the assembly is not dependent on the thickness of this element but is determined by the two reference surfaces of the stage tube.
  • motor coils of the electromechanical timepiece are furthermore advantageously fixed by means of the stage tubes.
  • the solution according to the present invention thus makes it possible to obtain a vertical assembly of high precision without this having the consequence of increasing the complexity and manufacturing costs of the assembled device.
  • the figure 1 shows a partial and schematic plan view of an electromechanical timepiece, generally indicated by numeral 1, characterized by a very small thickness and incorporating a stack assembly according to the present invention. For the purposes of illustration, part of the bottom of the timepiece 1 illustrated in the figure 1 has been removed to reveal part of the movement of this piece.
  • the figure 2 shows a sectional view of the timepiece illustrated in the figure 1 taken along the cutting line AA 'of this same figure.
  • the timepiece 1 illustrated comprises in particular a box or bottom-middle 2, preferably made of plastic, formed of a middle part 21 and a bottom 22 made in one piece, a movement 3 formed of a stacking assembly various modules (assembly which will be described in more detail below), a dial 4 disposed above the movement 3, and an ice cream 5.
  • the figure 3 shows an enlarged view, designated B, of the sectional view of the figure 2 .
  • the timepiece illustrated in the figures is the result of developments carried out by the Applicant in order to design an ultra-thin electromechanical timepiece comprising a plastic box, a timepiece which, in addition to conventional members of Analog time display, presents analog display devices of a timed time.
  • This timepiece derives, in its philosophy, a product developed by the Applicant and which was first marketed in 1997 under the name "Swatch SKIN” (registered trademark).
  • Swatch SKIN registered trademark
  • MO Koch published in the Proceedings of the 64th Congress of Chronometry, Swiss Society of Chronometry, The Trail, September 30 - October 1, 1999, Session 1 - Products I, Communication 1, pp 11 to 14 .
  • the "Swatch SKIN” includes only conventional analog time display devices comprising hour and minute hands and is characterized by a thickness of the order of 4 mm.
  • the electromechanical timepiece ultra-thin newly developed by the Applicant comprises, in addition to conventional analog time display devices, three other analog display members of a timed time, namely a first tenth of a second counter, a second counter of seconds, and a third counter of minutes and is characterized by a thickness slightly greater than the "Swatch SKIN" of 5.9 mm for a comparable diameter of 37.6 mm. This timepiece is only partially illustrated in the figures.
  • each of the display members of this timepiece is commonly driven by drive means (here four in number) each comprising a bipolar Lavet type motor consisting of a rotor, a stator and a coil mounted on the stator. All the display members and drive means are not illustrated in detail in the figures, which are not the subject of the present invention. Nevertheless, some of these elements are apparent from the figures.
  • the present invention is specifically directed to a stack assembly of a plurality of modules forming in particular the movement of an electronic or electromechanical timepiece.
  • the timepiece illustrated is only one example of a particularly advantageous application of the present invention. Indeed, given its complexity and strict constraints in thickness, it was necessary to develop a vertical assembly of high precision assembly which is the subject of the present invention. It will be understood that the invention is in no way limited to this single embodiment and that it can advantageously be applied to any electronic or electromechanical timepiece requiring precise vertical assembly of the various stacked modules.
  • the present invention can be applied to any electronic or electromechanical device other than a timepiece comprising a stack assembly of a plurality of modules having to meet strict thickness tolerance criteria.
  • first bipolar motor 6 of the Lavet type consisting of a rotor 61 (partially shown), a stator 62, and a coil 63 wound on a core 64 which is in contact with the stator 62.
  • This first motor conventionally drives the analog display members via a gear train (not shown).
  • a second bipolar motor 7 of the Lavet type consisting of a rotor 71 ( figure 1 only), a stator 72, and a coil 73 wound on a core 74 which is in contact with the stator 72.
  • the rotor 71 of this second motor 7 rotates a counter wheel 75 carrying a counter wheel axis 76 ( figure 2 ) and a counter hand 77 ( figure 2 ) indicating, in this case, a chronometric information relating to the timed time (for example the minutes).
  • Two other drive means (not shown), similar to the drive means described above, are arranged analogously in the timepiece 1 in order to drive the analog display members of the two other chronometric counters (no shown).
  • the movement 3 comprises an assembly of various stacked modules, namely, starting from the bottom 22, a lower plate 32, an electronic module 33 comprising in particular a printed circuit 34 and a motor module, indicated generally by the reference 36.
  • the lower plate is for example made of a metallic material and serves in particular as a reinforcement for the box 2 of the timepiece, box 2 which is preferably made of a plastic material.
  • the electronic module 33 supports, on the printed circuit board 34, various electrical and electronic components of the timepiece, in particular a quartz (not shown), an integrated circuit (not shown) intended in particular to control the hourly functions of the workpiece.
  • watchmaking and controlling the motors battery connection flanges (not shown) as well as the coils (coils 63, 73 and other coils not shown) means for driving the display members of the timepiece .
  • the motor module 36 supports the rotors and stators of the motors (for example the rotors 61, 71 and the stators 62, 72 of the motors 6, 7), as well as the various mobile timers and time counter (by example the counter wheel 75 and the counter wheel axis 76). More specifically, the motor module 36 comprises an upper plate 37 on which the stators of the drive means of the analog display members are riveted, as illustrated in FIG. figure 2 .
  • the lower plate 32, the electronic module 33 comprising its printed circuit 34, and the motor module 36 are stacked in this order on a plurality of feet or fastening lugs 24 preferably made of material with the bottom 22 of the box 2 and passing through mounting holes in the various modules.
  • These assembly orifices are respectively identified by the numerical references of the corresponding elements followed by the index a.
  • the reference 34a indicates, for example, an assembly orifice of the printed circuit 34.
  • the fixing lugs 24 are preferably arranged to pass, in addition to the various modules 32, 33 and 36, orifices provided at the ends of the cores on which the coils are wound (for example the cores 64 and 74 of the coils 63 and 73 illustrated in the Figures 1 and 2 ).
  • the assembly orifices of the cores of the coils are also indicated by the references of the corresponding elements followed by the index a.
  • at least eight fixing lugs are provided to maintain the four coils of the motors respectively driving the four analog display members of the timepiece.
  • the various elements succeed each other as follows from the bottom 22: the bottom plate 32, the printed circuit 34 of the electronic module 33, the core of a coil (64, 74 or other non-illustrated), the corresponding stator (62, 72 or other non-illustrated), and the upper plate 37 of the motor module 36. It will be understood in particular that the elements are assembled in this way, so that the cores of the coils are in contact with the corresponding stators of the drive means.
  • the ends 26 of the fixing studs 24 are preferably plastically deformed by a conventional riveting technique.
  • the movement 3 formed of the assembly of the modules 32, 33 and 36 is assembled by compression between first and second planes, respectively formed by a face 23 of the bottom 22 and by a shoulder 25 of the fixing studs 24 formed after plastic deformation. ends 26 of these tenons.
  • the vertical precision of the assembly forming the movement 3 of the timepiece 1 is dependent on the manufacturing accuracies and tolerances of the various stacked elements.
  • the vertical accuracy of the assembly is particularly dependent on the accuracy and manufacturing tolerances of the printed circuit 34, the thickness of the other elements can be more easily guaranteed in a reduced tolerance range.
  • intermediate elements 8 of tubular shape said so-called stage tubes, are placed on the tenons of fixation 24 in the immediate vicinity of the element whose thickness is not guarantee, namely the printed circuit board 34.
  • the figure 3 allows to highlight the structure of a floor tube 8.
  • This stage tube 8 comprises in particular first and second reference surfaces respectively indicated by the reference numerals 81 and 82.
  • These reference surfaces 81 and 82 are substantially perpendicular to the direction of the fixing studs 24 and are separated by a distance determined d1 which is greater than the thickness e of the printed circuit 34.
  • These first and second reference surfaces 81, 82 support the assembly, on the one hand, by a support on the lower plate 32, and on the other hand by pressing on the core of the coils (for example the cores 64, 74 of the coils 63, 73).
  • the stage tube 8 further comprises a zone 85, disposed between said reference surfaces 81, 82, arranged to maintain the printed circuit 34 supported in the assembly.
  • this zone 85 plastically penetrates into the printed circuit board 34.
  • the zone 85 of the stage tubes enters the printed circuit board 34 until the reference surfaces 81 and 82 come into contact with the neighboring elements, in this case, the lower plate 32, on the one hand, and the cores of the coils, on the other hand.
  • the thickness e of the printed circuit 34 thus does not affect the total thickness of the assembly forming the movement 3.
  • the length of the zone 85, marked d2 (in the direction of the fixing lugs 24) makes it possible to absorb the variations in thickness of the printed circuit 34 and is consequently greater than the maximum thickness of the printed circuit 34 can be observed.
  • this distance d2 is taken between a shoulder 83 of the stage tube 8 and the second reference surface 82.
  • this shoulder 83 is not necessary and that the distance d2 can be defined by the distance d1 separating the two reference surfaces 81 and 82.
  • the zone 85 absorbing the variations in thickness of the printed circuit 34 of the electronic module 33 may have various shapes.
  • this zone 85 has a portion 86 of diameter slightly greater than the diameter of the assembly orifice 34a in which it is inserted.
  • this portion 86 may take a substantially conical shape.
  • this portion 86 may have radial projections (star-shaped section) intended to penetrate the walls of the assembly orifice 34a of the printed circuit 34.
  • the tubes of stages 8 with axial projections directed towards the surface of the printed circuit 34. Referring to FIG. figure 3 these axial projections could for example be spared on the shoulder 83 of the floor tube 8.
  • the floor tube essentially fulfills two functions, namely (i) absorbing variations in the thickness of an element whose thickness is not guaranteed with precision (here the printed circuit 34 ), and (ii) nevertheless maintain this element in support in the assembly (in this particular case, maintain the printed circuit 34 in abutment against the cores of the coils of the drive means).
  • stage tube to fulfill the two functions mentioned above can be used.
  • stage tubes must simply be inserted into an assembly hole of the element concerned and (i) have first and second reference surfaces 81, 82 separated by a determined distance greater than the thickness of the element. concerned and against which the assembly is supported, and (ii) include a zone 85, between these reference surfaces, for maintaining the element in question in the assembly, the length of this zone 85 to be sufficient to absorb thickness variations of the element.
  • the stage tubes 8 may furthermore advantageously be extended axially by a tubular portion 87 cooperating with the assembly orifices of the cores of the coils (orifices 64a and 74a in the figures).
  • this tubular portion 87 is advantageously driven into the assembly opening of the coils (orifices 74a for example), in order to make the coils of the printed circuit board 34 of the electronic module 33 integral.
  • the coils are thus preferably mounted on the printed circuit board 34 and made integral with the latter so as to form a semi-final module that can be assembled in the timepiece.
  • the coils of the motors can be previously mounted on the printed circuit 34 of the electronic module 33 by means of the stage tubes 8, then connected to the connection pads typically made on the printed circuit board 34 of the electronic module 33, the latter being then ready to be mounted in the timepiece.
  • the electronic module 33 thus comprises not only the printed circuit 34 and the various components, such as quartz, the integrated circuit, the flanges for connection to the battery, but also a part of the components of the drive means, namely the coils (especially coils 63 and 73 illustrated in Figures 1 and 2 ) of the various engines of the timepiece.
  • the electronic module 33 already responds, by itself, to the definition of a stack assembly as claimed.
  • stage tubes 8 are in contact, on the one hand, with the lower plate 32, and, on the other hand, with the coils of the motors forming the drive means of the various components of analog display of the timepiece. Special attention should therefore be paid to the materials used to make the above items.
  • the bottom plate 32 is for example made of a metallic material.
  • a metallic material with high magnetic permeability such as an iron-rich metal alloy
  • Any other material with acceptable magnetic permeability characteristics could be used instead of brass.
  • the precise vertical assembly obtained by adding the tubes of stages 8 in the immediate vicinity of the printed circuit 34 makes it possible to guarantee In particular, this assembly makes it possible to ensure an adequate clearance allowing the rotation of the mobiles of the movement 3.
  • the figure 4 shows an enlarged view, designated C, of the base of the counter wheel 75 and the counter wheel axis 76.
  • the counter wheel axis 76 is rotatably mounted in a tubular element 78 abutting in an orifice 36b formed in the motor module 36, or more precisely in orifices respectively formed in the stator (for example a stator orifice 72b 72) and in the upper plate 37.
  • the distance d1 between the reference surfaces of the stage tubes 8 is here preferably chosen so that it allows (i) a precise vertical assembly of the various stacked modules, and (ii) a game at the level of the moving parts of the movement for example at the counter wheel 75 shown in the figures.

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Abstract

Watch assembly comprising a stack of modules (32, 33, 36) forming an electronic or electro-mechanical device (3). The assembly comprises a number of intermediate tubular elements (8), called stage tubes mounted on the fixing tenons (24) to compensate for different thicknesses of different components. Each state tube has first and second reference surfaces separated by a distance that is greater than the thickness of a first element (34) for which it is to compensate, and against which an assembly is supported and a zone between the first and second reference surfaces, that ensures the first element is held against the stack of modules. An Independent claim is made for a watch containing such an assembly as described.

Description

La présente invention se rapporte de manière générale à un assemblage par empilement d'une pluralité de modules composant un dispositif électronique ou électromécanique. Plus particulièrement, la présente invention se rapporte à une pièce d'horlogerie ultra-mince comportant un tel assemblage.The present invention relates generally to a stack assembly of a plurality of modules comprising an electronic or electromechanical device. More particularly, the present invention relates to an ultra-thin timepiece comprising such an assembly.

Des assemblages par empilement d'une pluralité de modules mécaniques, électroniques et/ou électromécaniques sont connus de l'homme du métier. De tels assemblages sont notamment utilisés dans le domaine de l'horlogerie afin de lier sous la forme d'un empilement les différents modules composant le mouvement d'une pièce d'horlogerie, tels une platine, un module électronique comportant notamment un circuit imprimé portant divers composants électroniques et électriques de la pièce d'horlogerie, et, le cas échéant, un support portant un ou plusieurs moyens d'entraînement d'un mécanisme de minuterie.Stack assemblies of a plurality of mechanical, electronic and / or electromechanical modules are known to those skilled in the art. Such assemblies are particularly used in the field of watchmaking to bind in the form of a stack the different modules composing the movement of a timepiece, such as a plate, an electronic module including a printed circuit bearing various electronic and electrical components of the timepiece, and, where appropriate, a support carrying one or more drive means of a timer mechanism.

Dans le domaine de l'horlogerie, une solution permettant d'effectuer un tel assemblage consiste par exemple à empiler les divers modules sur des tenons de fixation, puis à rendre solidaire le tout, par exemple par rivetage, c'est-à-dire par déformation plastique de l'extrémité des tenons de fixation. Une telle solution est particulièrement avantageuse car l'assemblage des divers éléments composant les modules peut être effectué de manière très aisée et peut notamment être effectué de manière automatique ou semi-automatique.In the field of watchmaking, a solution for performing such an assembly consists for example of stacking the various modules on the tenons of fixation, then to make integral all, for example by riveting, that is to say by plastic deformation of the end of the fixing lugs. Such a solution is particularly advantageous because the assembly of the various components of the modules can be done very easily and can in particular be performed automatically or semi-automatically.

Un tel assemblage par empilement de modules présente néanmoins un désavantage en ce que la précision verticale de l'assemblage est tributaire de la précision et des tolérances de fabrication des divers modules assemblés, notamment de l'épaisseur des éléments les constituant. Bien qu'il soit relativement aisé de fabriquer certains composants avec une épaisseur déterminée présentant de faibles tolérances, une telle précision et des tolérances faibles ne peuvent être garanties pour chaque module assemblé. En particulier, l'homme du métier rencontre de grandes difficultés à fabriquer des circuits imprimés dont l'épaisseur est garantie dans une gamme de tolérances réduite. Si l'homme du métier désire fabriquer une pièce d'horlogerie en y incorporant un assemblage par empilement de modules tel que décrit ci-dessus, assemblage dont au moins un module comporte un élément d'épaisseur fortement variable, tel un module électronique comportant un circuit imprimé, il ne pourra garantir une précision et des tolérances d'assemblage suffisantes pour certaines applications où une telle précision est une nécessité.Such assembly by stacking modules nevertheless has a disadvantage in that the vertical accuracy of the assembly is dependent on the accuracy and manufacturing tolerances of the various modules assembled, including the thickness of the elements constituting them. Although it is relatively easy to manufacture certain components with a determined thickness having low tolerances, such precision and low tolerances can not be guaranteed for each assembled module. In particular, those skilled in the art encounter great difficulties in manufacturing printed circuits whose thickness is guaranteed in a reduced range of tolerances. If the person skilled in the art wishes to manufacture a timepiece by incorporating a stack assembly of modules as described above, assembly of which at least one module comprises an element of highly variable thickness, such as an electronic module comprising a circuit When printed, it will not be able to guarantee sufficient precision and assembly tolerances for certain applications where such precision is a necessity.

En particulier, si l'homme du métier est désireux de fabriquer une pièce d'horlogerie devant répondre à des critères stricts de précision et de tolérance d'assemblage, notamment en vue de fabriquer une pièce d'horlogerie ultra-mince dont l'épaisseur est un facteur critique, il ne pourra trouver, dans les solutions actuelles à sa disposition, une solution suffisamment satisfaisante.In particular, if the person skilled in the art is desirous of manufacturing a timepiece which must meet strict criteria of precision and assembly tolerance, in particular with a view to manufacturing an ultra-thin timepiece whose thickness is a critical factor, it can not find, in the current solutions at its disposal, a sufficiently satisfactory solution.

Le document EP0907116 de la demanderesse décrit un dispositif de fixation sur le fond d'un boîtier comprenant un plot avec une partie distale déformable. Ce dispositif permet une fixation plus sûre sans requérir de soudage, sans toutefois pouvoir répondre à des critères stricts de précision et de tolérances d'assemblage pour un empilement de modules.The document EP0907116 Applicant discloses a fixing device on the bottom of a housing comprising a stud with a deformable distal portion. This device allows a more secure fixation without requiring welding, but can not meet strict criteria of precision and assembly tolerances for a stack of modules.

La présente invention a ainsi pour but de proposer un assemblage par empilement de divers modules composant un dispositif électronique ou électromécanique, tel un mouvement d'une pièce d'horlogerie, qui permette de prendre en compte des variations d'épaisseur d'au moins un élément constitutif des modules assemblés afin d'assurer que l'assemblage présente une épaisseur déterminée dans une gamme de tolérances réduite.The object of the present invention is therefore to propose a stack assembly of various modules comprising an electronic or electromechanical device, such as a movement of a timepiece, which makes it possible to take into account thickness variations of at least one constituent element of the assembled modules to ensure that the assembly has a determined thickness in a reduced range of tolerances.

La présente invention a également pour but de proposer un tel assemblage qui n'implique toutefois pas une complication substantielle du processus d'assemblage et n'augmente pas les coûts de fabrication du dispositif assemblé.The present invention also aims to provide such an assembly which does not imply a substantial complication of the assembly process and does not increase the manufacturing costs of the assembled device.

La présente invention a ainsi pour objet un assemblage par empilement d'une pluralité de modules composant un dispositif électronique ou électromécanique dont les caractéristiques sont énoncées à la revendication 1.The present invention thus relates to a stack assembly of a plurality of modules comprising an electronic or electromechanical device, the characteristics of which are set forth in claim 1.

Des modes de réalisation avantageux de cet assemblage font l'objet des revendications dépendantes.Advantageous embodiments of this assembly are the subject of the dependent claims.

En particulier, la présente invention a également pour objet une pièce d'horlogerie électronique ou électromécanique comportant un tel assemblage et dont les caractéristiques sont énoncées à la revendication dépendante 5.In particular, the present invention also relates to an electronic or electromechanical timepiece comprising such an assembly and whose characteristics are set out in the dependent claim 5.

Des modes de réalisation avantageux de cette pièce d'horlogerie font l'objet des revendications dépendantes 6 à 14. Ainsi, selon un aspect particulier de l'invention, divers modules composant une pièce d'horlogerie électromécanique sont assemblés de la sorte afin d'assurer que l'épaisseur du tout présente une grande précision permettant notamment de garantir un jeu déterminé au niveaux des divers mobiles, telles les roues moyenne et intermédiaire et/ou les roues de minuterie du mouvement de la pièce d'horlogerie, jeu qui est nécessaire pour permettre un fonctionnement adéquat du mouvement. L'assemblage selon la présente invention est notamment utilisé dans le but de fabriquer une pièce d'horlogerie ultra-mince.Advantageous embodiments of this timepiece are the subject of dependent claims 6 to 14. Thus, according to one particular aspect of the invention, various modules making up an electromechanical timepiece are assembled in this way in order to ensure that the thickness of the whole has a high accuracy, in particular to ensure a determined game at the various mobile, such as the medium and intermediate wheels and / or the timer wheels of the movement of the timepiece, which game is necessary to allow proper operation of the movement. The assembly according to the present invention is notably used for the purpose of making an ultra-thin timepiece.

Un avantage de la présente invention réside notamment dans sa simplicité de mise en oeuvre. En effet, selon la présente invention, un élément intermédiaire de forme tubulaire, ci-après appelé tube d'étages, est monté sur les tenons de fixation de l'assemblage, ce tube d'étages étant inséré dans l'orifice d'assemblage de l'élément assemblé dont l'épaisseur n'est pas garantie de manière à maintenir cet élément en appui dans l'assemblage. Ce tube d'étages présente des première et seconde surfaces de référence séparées d'une distance déterminée et contre lesquelles l'assemblage est supporté. L'élément intermédiaire présente, entre ses deux surfaces de référence, une zone pénétrant préférablement plastiquement dans l'élément concerné, la longueur de cette zone (dans la direction d'assemblage) étant telle qu'elle permet d'absorber les variations d'épaisseur de cet élément. Les deux faces de l'élément dont l'épaisseur n'est pas garantie ne viennent ainsi pas toutes deux en appui sur les modules voisins de sorte que l'épaisseur de l'assemblage n'est pas dépendante de l'épaisseur de cet élément mais est déterminée par les deux surfaces de référence du tube d'étages.An advantage of the present invention lies in particular in its simplicity of implementation. According to the present invention, an intermediate element of tubular shape, hereinafter referred to as a stage tube, is mounted on the fastening lugs of the assembly, this stage tube being inserted into the assembly opening assembled element whose thickness is not guaranteed so as to maintain this element in support in the assembly. This stage tube has first and second reference surfaces separated by a predetermined distance and against which the assembly is supported. The intermediate element has, between its two reference surfaces, a zone penetrating preferably plastically in the element concerned, the length of this zone (in the assembly direction) being such that it makes it possible to absorb the variations of thickness of this element. The two faces of the element whose thickness is not guaranteed do not both come to bear on the neighboring modules so that the thickness of the assembly is not dependent on the thickness of this element but is determined by the two reference surfaces of the stage tube.

Selon un autre aspect particulier de la présente invention, des bobines des moteurs de la pièce d'horlogerie électromécanique sont en outre avantageusement fixées au moyen des tubes d'étages.According to another particular aspect of the present invention, motor coils of the electromechanical timepiece are furthermore advantageously fixed by means of the stage tubes.

La solution selon la présente invention permet ainsi l'obtention d'un assemblage vertical de grande précision sans que cela ait pour conséquence une augmentation de la complexité et des coûts de fabrication du dispositif assemblé.The solution according to the present invention thus makes it possible to obtain a vertical assembly of high precision without this having the consequence of increasing the complexity and manufacturing costs of the assembled device.

D'autres caractéristiques et avantages de la présente invention apparaîtront plus clairement à la lecture de la description détaillée qui suit, faite en référence aux dessins annexés donnés à titre d'exemples non limitatifs et dans lesquels :

  • la figure 1 montre un vue en plan partielle et schématique du revers d'une pièce d'horlogerie électromécanique incorporant un assemblage par empilement de modules selon la présente invention;
  • la figure 2 montre une vue en coupe de la pièce d'horlogerie prise selon la ligne de coupe A-A' dans la figure 1;
  • la figure 3 montre une vue en coupe agrandie désignée B d'un tenon de fixation de l'assemblage illustré à la figure 2 mettant en évidence la structure d'un tube d'étages; et
  • la figure 4 montre une vue en coupe agrandie désignée C d'un mobile du mouvement de la pièce d'horlogerie illustrée aux figures 1 et 2, permettant de mettre en évidence un jeu assurant la rotation de ce mobile, ce jeu étant garanti par le mode d'assemblage selon la présente invention.
Other features and advantages of the present invention will appear more clearly on reading the detailed description which follows, made with reference to the accompanying drawings given by way of non-limiting examples and in which:
  • the figure 1 shows a partial and schematic plan view of the back of an electromechanical timepiece incorporating a stack assembly of modules according to the present invention;
  • the figure 2 shows a sectional view of the timepiece taken along the line AA 'cut in the figure 1 ;
  • the figure 3 shows an enlarged sectional view designated B of a fastening pin of the assembly illustrated in FIG. figure 2 highlighting the structure of a floor tube; and
  • the figure 4 shows an enlarged sectional view designated C of a mobile of the movement of the timepiece illustrated in FIGS. Figures 1 and 2 , allowing to highlight a game ensuring the rotation of this mobile, this game being guaranteed by the assembly mode according to the present invention.

La figure 1 montre une vue en plan partielle et schématique d'une pièce d'horlogerie électromécanique, indiquée généralement par la référence numérique 1, caractérisée par une très faible épaisseur et incorporant un assemblage par empilement selon la présente invention. Pour les besoins de l'illustration, une partie du fond de la pièce d'horlogerie 1 illustrée à la figure 1 a été supprimée pour laisser apparaître une partie du mouvement de cette pièce. La figure 2 montre quant à elle une vue en coupe de la pièce d'horlogerie illustrée à la figure 1 prise selon la ligne de coupe A-A' de cette même figure.The figure 1 shows a partial and schematic plan view of an electromechanical timepiece, generally indicated by numeral 1, characterized by a very small thickness and incorporating a stack assembly according to the present invention. For the purposes of illustration, part of the bottom of the timepiece 1 illustrated in the figure 1 has been removed to reveal part of the movement of this piece. The figure 2 shows a sectional view of the timepiece illustrated in the figure 1 taken along the cutting line AA 'of this same figure.

La pièce d'horlogerie 1 illustrée comprend notamment une boîte ou fond-carrure 2, préférablement en matière plastique, formée d'une carrure 21 et d'un fond 22 réalisés d'une pièce, un mouvement 3 formé d'un assemblage par empilement de divers modules (assemblage qui sera décrit plus en détail ci-après), un cadran 4 disposé au-dessus du mouvement 3, ainsi qu'une glace 5.The timepiece 1 illustrated comprises in particular a box or bottom-middle 2, preferably made of plastic, formed of a middle part 21 and a bottom 22 made in one piece, a movement 3 formed of a stacking assembly various modules (assembly which will be described in more detail below), a dial 4 disposed above the movement 3, and an ice cream 5.

La figure 3, à laquelle on se référera également autant que nécessaire, montre une vue agrandie, désignée B, de la vue en coupe de la figure 2.The figure 3 , to which reference will be made as much as necessary, shows an enlarged view, designated B, of the sectional view of the figure 2 .

La pièce d'horlogerie illustrée dans les figures est le résultat de développements effectués par la Demanderesse en vue de concevoir une pièce d'horlogerie électromécanique ultra-mince comportant une boîte en matière plastique, pièce d'horlogerie qui, outre des organes conventionnels d'affichage analogique de l'heure, présente des organes d'affichage analogique d'un temps chronométré. Cette pièce d'horlogerie dérive, dans sa philosophie, d'un produit développé par la Demanderesse et qui a vu sa première commercialisation sur le marché en 1997 sous la dénomination "Swatch SKIN" (marque déposée). A titre d'information, on pourra se référer à l'article " Swatch SKIN - La montre plastique ultra-plate", de M. O. Koch, publié dans les Actes du 64ème Congrès de Chronométrie, Société Suisse de Chronométrie, Le Sentier, 30 septembre - 1er octobre 1999, Session 1 - Produits I, Communication 1, pp. 11 à 14 . A titre d'information complémentaire, on pourra également se référer au document EP 0 691 595 au nom de la Demanderesse décrivant une montre-bracelet en matière plastique comportant une armature métallique de renforcement utilisée comme platine, montre-bracelet qui est conforme au produit susmentionné.The timepiece illustrated in the figures is the result of developments carried out by the Applicant in order to design an ultra-thin electromechanical timepiece comprising a plastic box, a timepiece which, in addition to conventional members of Analog time display, presents analog display devices of a timed time. This timepiece derives, in its philosophy, a product developed by the Applicant and which was first marketed in 1997 under the name "Swatch SKIN" (registered trademark). For information, we can refer to the article " Swatch SKIN - The ultra-thin plastic watch, by MO Koch, published in the Proceedings of the 64th Congress of Chronometry, Swiss Society of Chronometry, The Trail, September 30 - October 1, 1999, Session 1 - Products I, Communication 1, pp 11 to 14 . For additional information, reference may also be made to the document EP 0 691 595 in the name of the Applicant describing a plastic wristwatch having a reinforcing metal reinforcement used as a platinum, wristwatch which conforms to the aforementioned product.

La "Swatch SKIN" comporte uniquement des organes conventionnels d'affichage analogique de l'heure comprenant des aiguilles des heures et des minutes et se caractérise par une épaisseur de l'ordre de 4 mm. A titre de comparaison, la pièce d'horlogerie électromécanique ultra-mince nouvellement développée par la Demanderesse comporte, outre les organes conventionnels d'affichage analogique de l'heure, trois autres organes d'affichage analogique d'un temps chronométré, à savoir un premier compteur de dixièmes de seconde, un second compteur de secondes, et un troisième compteur de minutes et se caractérise par une épaisseur légèrement supérieure à la "Swatch SKIN" de 5,9 mm pour un diamètre comparable de 37,6 mm. Cette pièce d'horlogerie n'est que partiellement illustrée dans les figures.The "Swatch SKIN" includes only conventional analog time display devices comprising hour and minute hands and is characterized by a thickness of the order of 4 mm. By way of comparison, the electromechanical timepiece ultra-thin newly developed by the Applicant comprises, in addition to conventional analog time display devices, three other analog display members of a timed time, namely a first tenth of a second counter, a second counter of seconds, and a third counter of minutes and is characterized by a thickness slightly greater than the "Swatch SKIN" of 5.9 mm for a comparable diameter of 37.6 mm. This timepiece is only partially illustrated in the figures.

On notera en complément que chacun des organes d'affichage de cette pièce d'horlogerie est communément entraîné par des moyens d'entraînement (ici au nombre de quatre) comprenant chacun un moteur bipolaire de type Lavet constitué d'un rotor, d'un stator et d'une bobine montée sur le stator. Tous les organes d'affichage et moyens d'entraînement ne sont pas illustrés en détails dans les figures, ceux-ci ne faisant pas l'objet de la présente invention. Néanmoins, une partie de ces éléments est apparente des figures.It should be noted in addition that each of the display members of this timepiece is commonly driven by drive means (here four in number) each comprising a bipolar Lavet type motor consisting of a rotor, a stator and a coil mounted on the stator. All the display members and drive means are not illustrated in detail in the figures, which are not the subject of the present invention. Nevertheless, some of these elements are apparent from the figures.

On insistera sur le fait que la présente invention s'adresse spécifiquement à un assemblage par empilement d'une pluralité de modules formant notamment le mouvement d'une pièce d'horlogerie électronique ou électromécanique. On notera que la pièce d'horlogerie illustrée ne constitue qu'un exemple d'application particulièrement avantageux de la présente invention. En effet, compte tenu de sa complexité et des contraintes strictes en épaisseur, il était nécessaire de développer un assemblage vertical de grande précision, assemblage qui fait l'objet de la présente invention. 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 nécessitant un assemblage vertical précis des divers modules empilés. Par extension, la présente invention peut être appliquée à tout dispositif électronique ou électromécanique autre qu'une pièce d'horlogerie comprenant un assemblage par empilement d'une pluralité de modules devant répondre à des critères stricts de tolérance en épaisseur.It will be emphasized that the present invention is specifically directed to a stack assembly of a plurality of modules forming in particular the movement of an electronic or electromechanical timepiece. It will be noted that the timepiece illustrated is only one example of a particularly advantageous application of the present invention. Indeed, given its complexity and strict constraints in thickness, it was necessary to develop a vertical assembly of high precision assembly which is the subject of the present invention. It will be understood that the invention is in no way limited to this single embodiment and that it can advantageously be applied to any electronic or electromechanical timepiece requiring precise vertical assembly of the various stacked modules. By extension, the present invention can be applied to any electronic or electromechanical device other than a timepiece comprising a stack assembly of a plurality of modules having to meet strict thickness tolerance criteria.

En se référant à nouveau aux figures 1 et 2, on peut voir une partie des moyens d'entraînement des organes d'affichage analogique de l'heure comprenant un premier moteur bipolaire 6 de type Lavet constitué d'un rotor 61 (partiellement représenté), d'un stator 62, et d'une bobine 63 enroulée sur un noyau 64 qui est en contact avec le stator 62. Ce premier moteur entraîne de manière classique les organes d'affichage analogique par l'intermédiaire d'un rouage (non représenté).Referring again to Figures 1 and 2 , one can see a portion of the drive means of the analog time display members comprising a first bipolar motor 6 of the Lavet type consisting of a rotor 61 (partially shown), a stator 62, and a coil 63 wound on a core 64 which is in contact with the stator 62. This first motor conventionally drives the analog display members via a gear train (not shown).

Une partie des moyens d'entraînement des organes d'affichage analogique de l'un des trois compteurs chronométriques (en l'occurrence, et de manière non limitative, le compteur chronométrique des minutes) est également illustrée. Ces moyens d'entraînement comprennent un second moteur bipolaire 7 de type Lavet constitué d'un rotor 71 (figure 1 uniquement), d'un stator 72, et d'une bobine 73 enroulée sur un noyau 74 qui est en contact avec le stator 72. Le rotor 71 de ce second moteur 7 entraîne en rotation une roue de compteur 75 portant un axe de roue de compteur 76 (figure 2) ainsi qu'une aiguille de compteur 77 (figure 2) indiquant, dans ce cas de figure, une information chronométrique relative au temps chronométré (par exemple les minutes).Part of the drive means of the analog display members of one of the three chronometric counters (in this case, and not limited to, the timer counter of minutes) is also illustrated. These drive means comprise a second bipolar motor 7 of the Lavet type consisting of a rotor 71 ( figure 1 only), a stator 72, and a coil 73 wound on a core 74 which is in contact with the stator 72. The rotor 71 of this second motor 7 rotates a counter wheel 75 carrying a counter wheel axis 76 ( figure 2 ) and a counter hand 77 ( figure 2 ) indicating, in this case, a chronometric information relating to the timed time (for example the minutes).

Deux autres moyens d'entraînement (non illustrés), similaires aux moyens d'entraînement décrits plus haut, sont disposés de manière analogue dans la pièce d'horlogerie 1 afin d'entraîner les organes d'affichage analogique des deux autres compteurs chronométriques (non illustrés).Two other drive means (not shown), similar to the drive means described above, are arranged analogously in the timepiece 1 in order to drive the analog display members of the two other chronometric counters (no shown).

En se référant plus spécifiquement aux figures 2 et 3, le mouvement 3, déjà mentionné, comprend un assemblage de divers modules empilés, à savoir, en partant du fond 22, une platine inférieure 32, un module électronique 33 comprenant notamment un circuit imprimé 34 et un module moteur, indiqué généralement par la référence 36.Referring more specifically to figures 2 and 3 , the movement 3, already mentioned, comprises an assembly of various stacked modules, namely, starting from the bottom 22, a lower plate 32, an electronic module 33 comprising in particular a printed circuit 34 and a motor module, indicated generally by the reference 36.

La platine inférieure est par exemple réalisée en un matériau métallique et sert notamment de renfort pour la boîte 2 de la pièce d'horlogerie, boîte 2 qui est préférablement réalisée dans une matière plastique.The lower plate is for example made of a metallic material and serves in particular as a reinforcement for the box 2 of the timepiece, box 2 which is preferably made of a plastic material.

Le module électronique 33 supporte, sur le circuit imprimé 34, divers composants électriques et électroniques de la pièce d'horlogerie, notamment un quartz (non représenté), un circuit intégré (non représenté) destiné notamment à contrôler les fonctions horaires de la pièce d'horlogerie et à commander les moteurs, des brides de connexion à une pile (non représentées) ainsi que les bobines (bobines 63, 73 et autres bobines non illustrées) des moyens d'entraînement des organes d'affichage de la pièce d'horlogerie.The electronic module 33 supports, on the printed circuit board 34, various electrical and electronic components of the timepiece, in particular a quartz (not shown), an integrated circuit (not shown) intended in particular to control the hourly functions of the workpiece. watchmaking and controlling the motors, battery connection flanges (not shown) as well as the coils (coils 63, 73 and other coils not shown) means for driving the display members of the timepiece .

Le module moteur 36, quant à lui, supporte les rotors et stators des moteurs (par exemple les rotors 61, 71 et les stators 62, 72 des moteurs 6, 7), ainsi que les divers mobiles de minuterie et de compteur chronométrique (par exemple la roue de compteur 75 et l'axe de roue de compteur 76). Plus spécifiquement, le module moteur 36 comprend une platine supérieure 37 sur laquelle sont notamment rivetés les stators des moyens d'entraînement des organes d'affichage analogique comme illustré dans la figure 2.The motor module 36, meanwhile, supports the rotors and stators of the motors (for example the rotors 61, 71 and the stators 62, 72 of the motors 6, 7), as well as the various mobile timers and time counter (by example the counter wheel 75 and the counter wheel axis 76). More specifically, the motor module 36 comprises an upper plate 37 on which the stators of the drive means of the analog display members are riveted, as illustrated in FIG. figure 2 .

La platine inférieure 32, le module électronique 33 comprenant son circuit imprimé 34, et le module moteur 36 sont empilés dans cet ordre sur une pluralité de pieds ou tenons de fixation 24 venant préférablement de matière avec le fond 22 de la boîte 2 et traversant des orifices d'assemblage ménagés dans les divers modules. Ces orifices d'assemblage sont respectivement repérés par les références numériques des éléments correspondants suivies de l'indice a. La référence 34a indique par exemple un orifice d'assemblage du circuit imprimé 34.The lower plate 32, the electronic module 33 comprising its printed circuit 34, and the motor module 36 are stacked in this order on a plurality of feet or fastening lugs 24 preferably made of material with the bottom 22 of the box 2 and passing through mounting holes in the various modules. These assembly orifices are respectively identified by the numerical references of the corresponding elements followed by the index a. The reference 34a indicates, for example, an assembly orifice of the printed circuit 34.

Seuls trois tenons de fixation 24 sont illustrés dans les figures 1 et 2, mais on comprendra bien évidemment qu'un nombre adéquat de tenons est utilisé pour assurer une stabilité de l'assemblage dans la pièce d'horlogerie.Only three studs 24 are illustrated in the Figures 1 and 2 , but it will of course be understood that an adequate number of tenons is used to ensure stability of the assembly in the timepiece.

Dans ce mode de réalisation, les tenons de fixation 24 sont préférablement agencés pour traverser, outre les divers modules 32, 33 et 36, des orifices ménagés aux extrémités des noyaux sur lesquels sont enroulées les bobines (par exemple les noyaux 64 et 74 des bobines 63 et 73 illustrées dans les figures 1 et 2). Dans les figures, les orifices d'assemblage des noyaux des bobines sont également indiqués par les références des éléments correspondants suivies de l'indice a. Dans ce mode de réalisation, on notera, à titre non limitatif, qu'au moins huit tenons de fixation sont prévus pour maintenir les quatre bobines des moteurs entraînant respectivement les quatre organes d'affichage analogique de la pièce d'horlogerie.In this embodiment, the fixing lugs 24 are preferably arranged to pass, in addition to the various modules 32, 33 and 36, orifices provided at the ends of the cores on which the coils are wound (for example the cores 64 and 74 of the coils 63 and 73 illustrated in the Figures 1 and 2 ). In the figures, the assembly orifices of the cores of the coils are also indicated by the references of the corresponding elements followed by the index a. In this embodiment, it will be noted, without limitation, that at least eight fixing lugs are provided to maintain the four coils of the motors respectively driving the four analog display members of the timepiece.

Comme illustré à la figure 2, les divers éléments se succèdent comme suit depuis le fond 22 : la platine inférieure 32, le circuit imprimé 34 du module électronique 33, le noyau d'une bobine (64, 74 ou autres non illustrés), le stator correspondant (62, 72 ou autres non illustrés), et la platine supérieure 37 du module moteur 36. On comprendra notamment que les éléments sont assemblés de la sorte, de manière à ce que les noyaux des bobines soient en contact avec les stators correspondants des moyens d'entraînement.As illustrated in figure 2 , the various elements succeed each other as follows from the bottom 22: the bottom plate 32, the printed circuit 34 of the electronic module 33, the core of a coil (64, 74 or other non-illustrated), the corresponding stator (62, 72 or other non-illustrated), and the upper plate 37 of the motor module 36. It will be understood in particular that the elements are assembled in this way, so that the cores of the coils are in contact with the corresponding stators of the drive means.

Afin d'assurer l'assemblage des modules empilés, les extrémités 26 des tenons de fixation 24 sont préférablement déformées plastiquement par une technique de rivetage conventionnelle. Ainsi le mouvement 3 formé de l'assemblage des modules 32, 33 et 36 est assemblé par compression entre des premier et second plans, formés respectivement par une face 23 du fond 22 et par un épaulement 25 des tenons de fixation 24 formé après déformation plastique des extrémités 26 de ces tenons.In order to assemble the stacked modules, the ends 26 of the fixing studs 24 are preferably plastically deformed by a conventional riveting technique. Thus the movement 3 formed of the assembly of the modules 32, 33 and 36 is assembled by compression between first and second planes, respectively formed by a face 23 of the bottom 22 and by a shoulder 25 of the fixing studs 24 formed after plastic deformation. ends 26 of these tenons.

Comme mentionné en préambule de la présente description, sans autres mécanismes, la précision verticale de l'assemblage formant le mouvement 3 de la pièce d'horlogerie 1 est tributaire des précisions et tolérances de fabrication des divers éléments empilés. En particulier, la précision verticale de l'assemblage est particulièrement dépendante de la précision et des tolérances de fabrication du circuit imprimé 34, l'épaisseur des autres éléments pouvant être plus aisément garantie dans une gamme de tolérance réduite.As mentioned in the preamble of the present description, without other mechanisms, the vertical precision of the assembly forming the movement 3 of the timepiece 1 is dependent on the manufacturing accuracies and tolerances of the various stacked elements. In particular, the vertical accuracy of the assembly is particularly dependent on the accuracy and manufacturing tolerances of the printed circuit 34, the thickness of the other elements can be more easily guaranteed in a reduced tolerance range.

Selon la présente invention, afin d'assurer une précision adéquate en épaisseur de l'assemblage formant le mouvement 3 de la pièce d'horlogerie, des éléments intermédiaires 8 de forme tubulaire, dits tubes d'étages, sont placés sur les tenons de fixation 24 au voisinage immédiat de l'élément dont l'épaisseur n'est pas garantie, à savoir le circuit imprimé 34. La figure 3 permet de mettre en évidence la structure d'un tube d'étage 8.According to the present invention, in order to ensure adequate precision in thickness of the assembly forming the movement 3 of the timepiece, intermediate elements 8 of tubular shape, said so-called stage tubes, are placed on the tenons of fixation 24 in the immediate vicinity of the element whose thickness is not guarantee, namely the printed circuit board 34. The figure 3 allows to highlight the structure of a floor tube 8.

Ce tube d'étages 8 comprend en particulier des première et seconde surfaces de référence indiquées respectivement par les références numériques 81 et 82. Ces surfaces de référence 81 et 82 sont sensiblement perpendiculaires à la direction des tenons de fixation 24 et sont séparées par une distance déterminée d1 qui est supérieure à l'épaisseur e du circuit imprimé 34. Ces première et seconde surfaces de référence 81, 82 supportent l'assemblage, d'une part, par un appui sur la platine inférieure 32, et, d'autre part, par un appui sur le noyau des bobines (par exemple les noyaux 64, 74 des bobines 63, 73).This stage tube 8 comprises in particular first and second reference surfaces respectively indicated by the reference numerals 81 and 82. These reference surfaces 81 and 82 are substantially perpendicular to the direction of the fixing studs 24 and are separated by a distance determined d1 which is greater than the thickness e of the printed circuit 34. These first and second reference surfaces 81, 82 support the assembly, on the one hand, by a support on the lower plate 32, and on the other hand by pressing on the core of the coils (for example the cores 64, 74 of the coils 63, 73).

Le tube d'étages 8 comprennent en outre une zone 85, disposée entre lesdites surfaces de références 81, 82, agencée pour maintenir le circuit imprimé 34 en appui dans l'assemblage. Préférablement, cette zone 85 pénètre plastiquement dans le circuit imprimé 34. Ainsi, lors de l'assemblage sur les tenons de fixation 24, la zone 85 des tubes d'étages pénètre dans le circuit imprimé 34 jusqu'à ce que les surfaces de référence 81 et 82 viennent en contact avec les éléments voisins, dans ce cas, la platine inférieure 32, d'une part, et les noyaux des bobines, d'autre part. Au final, l'épaisseur e du circuit imprimé 34 n'affecte ainsi nullement l'épaisseur totale de l'assemblage formant le mouvement 3.The stage tube 8 further comprises a zone 85, disposed between said reference surfaces 81, 82, arranged to maintain the printed circuit 34 supported in the assembly. Preferably, this zone 85 plastically penetrates into the printed circuit board 34. Thus, during assembly on the fixing lugs 24, the zone 85 of the stage tubes enters the printed circuit board 34 until the reference surfaces 81 and 82 come into contact with the neighboring elements, in this case, the lower plate 32, on the one hand, and the cores of the coils, on the other hand. In the end, the thickness e of the printed circuit 34 thus does not affect the total thickness of the assembly forming the movement 3.

Pour ce faire, il est bien évidemment nécessaire que la longueur de la zone 85, repérée d2, (dans la direction des tenons de fixation 24) permette d'absorber les variations d'épaisseur du circuit imprimé 34 et soit en conséquence supérieure à l'épaisseur maximale du circuit imprimée 34 pouvant être constatée. Dans l'illustration de la figure 3, cette distance d2 est prise entre un épaulement 83 du tube d'étages 8 et la seconde surface de référence 82. On comprendra toutefois que cet épaulement 83 n'est pas nécessaire et que la distance d2 peut être définie par la distance d1 séparant les deux surfaces de référence 81 et 82.To do this, it is obviously necessary that the length of the zone 85, marked d2 , (in the direction of the fixing lugs 24) makes it possible to absorb the variations in thickness of the printed circuit 34 and is consequently greater than the maximum thickness of the printed circuit 34 can be observed. In the illustration of the figure 3 this distance d2 is taken between a shoulder 83 of the stage tube 8 and the second reference surface 82. However, it will be understood that this shoulder 83 is not necessary and that the distance d2 can be defined by the distance d1 separating the two reference surfaces 81 and 82.

La zone 85 absorbant les variations d'épaisseur du circuit imprimé 34 du module électronique 33 peut présenter diverses formes. Préférablement, comme illustré, cette zone 85 présente une portion 86 de diamètre légèrement supérieur au diamètre de l'orifice d'assemblage 34a dans lequel il est inséré. Avantageusement, cette portion 86 peut prendre une forme sensiblement conique. Alternativement, cette portion 86 peut présenter des projections radiales (section de forme étoilée) destinées à pénétrer dans les parois de l'orifice d'assemblage 34a du circuit imprimé 34.The zone 85 absorbing the variations in thickness of the printed circuit 34 of the electronic module 33 may have various shapes. Preferably, as illustrated, this zone 85 has a portion 86 of diameter slightly greater than the diameter of the assembly orifice 34a in which it is inserted. Advantageously, this portion 86 may take a substantially conical shape. Alternatively, this portion 86 may have radial projections (star-shaped section) intended to penetrate the walls of the assembly orifice 34a of the printed circuit 34.

Egalement à titre d'alternative, il peut être envisageable de pourvoir les tubes d'étages 8 de projections axiales dirigées vers la surface du circuit imprimé 34. En se référant à la figure 3, ces projections axiales pourraient par exemple être ménagées sur l'épaulement 83 du tube d'étage 8.Also as an alternative, it may be conceivable to provide the tubes of stages 8 with axial projections directed towards the surface of the printed circuit 34. Referring to FIG. figure 3 these axial projections could for example be spared on the shoulder 83 of the floor tube 8.

D'une manière générale, on comprendra que le tube d'étage remplit essentiellement deux fonctions, nommément (i) absorber les variations d'épaisseur d'un élément dont l'épaisseur n'est pas garantie avec précision (ici le circuit imprimé 34), et (ii) néanmoins maintenir cet élément en appui dans l'assemblage (dans ce cas particulier, maintenir le circuit imprimé 34 en appui contre les noyaux des bobines des moyens d'entraînement).In general, it will be understood that the floor tube essentially fulfills two functions, namely (i) absorbing variations in the thickness of an element whose thickness is not guaranteed with precision (here the printed circuit 34 ), and (ii) nevertheless maintain this element in support in the assembly (in this particular case, maintain the printed circuit 34 in abutment against the cores of the coils of the drive means).

Toute forme de tube d'étages permettant de remplir les deux fonctions susmentionnées peut donc être utilisée. Ces tubes d'étages doivent simplement être insérés dans un orifice d'assemblage de l'élément concerné et (i) présenter des première et seconde surfaces de référence 81, 82 séparées d'une distance déterminée supérieure à l'épaisseur de l'élément concerné et contre lesquelles l'assemblage est supporté, et (ii) comporter une zone 85, entre ces surfaces de référence, permettant de maintenir en appui l'élément concerné dans l'assemblage, la longueur de cette zone 85 devant être suffisante pour absorber des variations d'épaisseur de l'élément.Any form of stage tube to fulfill the two functions mentioned above can be used. These stage tubes must simply be inserted into an assembly hole of the element concerned and (i) have first and second reference surfaces 81, 82 separated by a determined distance greater than the thickness of the element. concerned and against which the assembly is supported, and (ii) include a zone 85, between these reference surfaces, for maintaining the element in question in the assembly, the length of this zone 85 to be sufficient to absorb thickness variations of the element.

Comme illustré dans les figures 2 et 3, les tubes d'étages 8 peuvent en outre avantageusement être prolongés axialement par une portion tubulaire 87 coopérant avec les orifices d'assemblage des noyaux des bobines (orifices 64a et 74a dans les figures). En particulier, cette portion tubulaire 87 est avantageusement chassée dans l'orifice d'assemblage des bobines (orifices 74a par exemple), afin de rendre solidaires les bobines du circuit imprimé 34 du module électronique 33.As illustrated in figures 2 and 3 , the stage tubes 8 may furthermore advantageously be extended axially by a tubular portion 87 cooperating with the assembly orifices of the cores of the coils (orifices 64a and 74a in the figures). In particular, this tubular portion 87 is advantageously driven into the assembly opening of the coils (orifices 74a for example), in order to make the coils of the printed circuit board 34 of the electronic module 33 integral.

Au moyen des tubes d'étages 8 conformes aux illustrations des figures 2 et 3, les bobines sont ainsi préférablement montées sur le circuit imprimé 34 et rendues solidaires de ce dernier de manière à former un module semi-final pouvant être assemblé dans la pièce d'horlogerie. En particulier, les bobines des moteurs peuvent être préalablement montées sur le circuit imprimé 34 du module électronique 33 au moyen des tubes d'étages 8, puis connectées aux plages de connexion typiquement réalisées sur le circuit imprimé 34 du module électronique 33, ce dernier étant alors prêt à être monté dans la pièce d'horlogerie.By means of the tubes of stages 8 according to the illustrations of figures 2 and 3 , the coils are thus preferably mounted on the printed circuit board 34 and made integral with the latter so as to form a semi-final module that can be assembled in the timepiece. In particular, the coils of the motors can be previously mounted on the printed circuit 34 of the electronic module 33 by means of the stage tubes 8, then connected to the connection pads typically made on the printed circuit board 34 of the electronic module 33, the latter being then ready to be mounted in the timepiece.

Le module électronique 33 comprend ainsi non seulement le circuit imprimé 34 et les divers composants, tels que le quartz, le circuit intégré, les brides de connexion à la pile, mais également une partie des composants des moyens d'entraînement, à savoir les bobines (notamment les bobines 63 et 73 illustrées dans les figures 1 et 2) des divers moteurs de la pièce d'horlogerie. Dans le cadre de la présente invention, on pourra ainsi noter que le module électronique 33 répond déjà, à lui seul, à la définition d'un assemblage par empilement tel que revendiqué.The electronic module 33 thus comprises not only the printed circuit 34 and the various components, such as quartz, the integrated circuit, the flanges for connection to the battery, but also a part of the components of the drive means, namely the coils (especially coils 63 and 73 illustrated in Figures 1 and 2 ) of the various engines of the timepiece. In the context of the present invention, it will thus be noted that the electronic module 33 already responds, by itself, to the definition of a stack assembly as claimed.

Dans le cadre du mode de réalisation particulier illustré dans les figures, il convient de préciser encore certains points. En se référant aux illustrations des figures 2 et 3, il convient de constater que les tubes d'étages 8 sont en contact, d'une part, avec la platine inférieure 32, et, d'autre part, avec les bobines des moteurs formant les moyens d'entraînement des divers organes d'affichage analogique de la pièce d'horlogerie. Il convient en conséquence d'attacher une attention toute particulière au matériaux utilisés pour réaliser les éléments susmentionnés.In the context of the particular embodiment illustrated in the figures, certain points need to be further clarified. Referring to the illustrations of figures 2 and 3 it should be noted that the stage tubes 8 are in contact, on the one hand, with the lower plate 32, and, on the other hand, with the coils of the motors forming the drive means of the various components of analog display of the timepiece. Special attention should therefore be paid to the materials used to make the above items.

Dans le cas de figure qui vient d'être présenté, il a été mentionné que la platine inférieure 32 est par exemple réalisée dans un matériau métallique. Dans l'éventualité où un matériau métallique à grande perméabilité magnétique était utilisé, tel qu'un alliage métallique riche en fer, il conviendra de fabriquer les tubes d'étages dans un matériau qui n'est pas ou très faiblement susceptible d'être parcouru par le flux magnétique généré par les bobines des moteurs, c'est-à-dire un matériau présentant une faible perméabilité magnétique, tel qu'un laiton par exemple, ce matériau présentant par ailleurs l'avantage d'être suffisamment dur pour pénétrer plastiquement dans le circuit imprimé 34. Tout autre matériau présentant des caractéristiques de perméabilité magnétique acceptables pourrait être utilisé en lieu et place du laiton. On notera que si un matériau présentant une grande perméabilité magnétique était utilisé, le flux magnétique généré par les bobines des moteurs serait susceptible de s'étendre dans la platine inférieure 32. On comprendra qu'il est bien évidemment également envisageable de réaliser la platine inférieure 32 dans un matériau de faible perméabilité magnétique afin d'éviter cet inconvénient.In the case of the figure which has just been presented, it has been mentioned that the bottom plate 32 is for example made of a metallic material. In the event that a metallic material with high magnetic permeability is used, such as an iron-rich metal alloy, it will be necessary to manufacture the tubes of stages in a material which is not or very little likely to be covered by the magnetic flux generated by the coils of the motors, that is to say a material having a low magnetic permeability, such as a brass for example, this material also having the advantage of being hard enough to penetrate plastically in the printed circuit board 34. Any other material with acceptable magnetic permeability characteristics could be used instead of brass. Note that if a material having a high magnetic permeability was used, the magnetic flux generated by the coils of the engines would be likely to extend in the lower plate 32. It will be understood that it is of course also conceivable to make the lower plate 32 in a material of low magnetic permeability to avoid this disadvantage.

En rapport avec la pièce d'horlogerie illustrée constituant un exemple d'application avantageux de la présente invention, l'assemblage vertical précis obtenu grâce à l'adjonction des tubes d'étages 8 au voisinage immédiat du circuit imprimé 34, permet de garantir une épaisseur précise du mouvement horloger 3. En particulier, cet assemblage permet d'assurer un jeu adéquat permettant la rotation des mobiles du mouvement 3.In connection with the illustrated timepiece constituting an example of advantageous application of the present invention, the precise vertical assembly obtained by adding the tubes of stages 8 in the immediate vicinity of the printed circuit 34, makes it possible to guarantee In particular, this assembly makes it possible to ensure an adequate clearance allowing the rotation of the mobiles of the movement 3.

A titre d'exemple, la figure 4 montre une vue agrandie, désignée C, de la base de la roue de compteur 75 et de l'axe de roue de compteur 76. Comme illustré dans cette figure ainsi que dans la figure 2, l'axe de roue de compteur 76 est monté rotatif dans un élément tubulaire 78 venant en butée dans un orifice 36b ménagé dans le module moteur 36, ou plus exactement dans des orifices ménagés respectivement dans le stator (par exemple un orifice 72b du stator 72) et dans la platine supérieure 37. Afin d'assurer que la rotation du mobile telle que la roue de compteur 75 soit possible, il convient de garantir qu'un jeu suffisant existe entre cette roue de compteur 75 et l'élément tubulaire 78. Si un tel jeu n'était pas assuré, la rotation de la roue de compteur 75 pourrait être rendue impossible si les modules venaient à être assemblé de sorte que l'élément tubulaire 78 viendrait serrer la roue de compteur 75 contre la platine inférieure 32.For example, the figure 4 shows an enlarged view, designated C, of the base of the counter wheel 75 and the counter wheel axis 76. As illustrated in this figure as well as in the figure 2 , the counter wheel axis 76 is rotatably mounted in a tubular element 78 abutting in an orifice 36b formed in the motor module 36, or more precisely in orifices respectively formed in the stator (for example a stator orifice 72b 72) and in the upper plate 37. In order to ensure that the rotation of the wheel such as the counter wheel 75 is possible, it must be ensured that sufficient clearance exists between this counter wheel 75 and the tubular element 78 If such a game were not ensured, the rotation of the wheel of counter 75 could be made impossible if the modules were to be assembled so that the tubular element 78 would tighten the counter wheel 75 against the bottom plate 32.

Ainsi, la distance d1 entre les surfaces de référence des tubes d'étages 8 est ici préférablement choisie de sorte qu'elle permet (i) un assemblage vertical précis des divers modules empilés, et (ii) un jeu au niveau des mobiles du mouvement, par exemple au niveau de la roue de compteur 75 illustrée dans les figures.Thus, the distance d1 between the reference surfaces of the stage tubes 8 is here preferably chosen so that it allows (i) a precise vertical assembly of the various stacked modules, and (ii) a game at the level of the moving parts of the movement for example at the counter wheel 75 shown in the figures.

On comprendra que diverses modifications et/ou améliorations évidentes pour l'homme du métier peuvent être apportées aux modes de réalisation décrits dans la présente description sans sortir du cadre de l'invention défini par les revendications annexées. En particulier, bien qu'il ait été décrit que l'assemblage est assemblé par déformation plastique des extrémités des tenons de fixation, c'est-à-dire selon une technique de rivetage, l'assemblage peut alternativement être assemblé par d'autres techniques équivalentes par lesquelles les divers modules empilés seraient maintenus ensemble par compression entre deux plans, par exemple au moyen d'un système de fixation à vis. L'utilisation d'une technique de rivetage s'avère toutefois particulièrement avantageuse économiquement, notamment en vue d'une automatisation de l'assemblage.It will be understood that various modifications and / or improvements obvious to those skilled in the art can be made to the embodiments described in the present description without departing from the scope of the invention defined by the appended claims. In particular, although it has been described that the assembly is assembled by plastic deformation of the ends of the fixing lugs, that is to say according to a riveting technique, the assembly can alternatively be assembled by other equivalent techniques by which the various stacked modules would be held together by compression between two planes, for example by means of a screw fastening system. However, the use of a riveting technique is particularly advantageous economically, especially with a view to automation of the assembly.

Claims (14)

  1. Stacked assembly of a plurality of modules (32, 33, 36) forming an electronic or electromechanical device (3), said modules (32, 33, 36) being mounted via assembly orifices (32a, 34a, 37a, 72a) on a plurality of mounting pins (24) and assembled by compression between first and second planes (23, 25), said plurality of modules (32, 33, 36) including at least a first element (34) whose thickness (e) is guaranteed with a precision inferior to the one of the other modules,
    characterised in that said assembly includes a plurality of tube-shaped intermediate elements, called stepped tubes (8), mounted respectively on said mounting pins (24), each stepped tube (8) being inserted in an assembly orifice (34a) of said first element (34), each stepped tube (8) having:
    - first and second reference surfaces (81, 82) separated by a determined distance (d1) greater than the thickness (e) of said first element (34) and against which the assembly is supported, and
    - a zone (85), between said first and second reference surfaces (81, 82), allowing said first element (34) to be kept in abutment in the assembly, the length (d2) of said zone (85), in the direction of said mounting pins (24), being greater than the maximal thickness of said first element (34) in order to allow for variations in the thickness (e) of said first element to be absorbed.
  2. Assembly according to claim 1, characterised in that said zone (85) penetrates said first element (34) so as to plastically deform said first element and has a portion (86) of slightly greater diameter than the diameter of the assembly orifice (34a) in which it is inserted.
  3. Assembly according to claim 2, characterised in that said portion (86) is of substantially conical shape.
  4. Assembly according to claims 1 to 3, characterised in that said modules (32, 33, 36) are assembled by plastically deforming the ends (26) of said mounting pins (24).
  5. Timepiece (1) including a case (2, 21, 22) and a stacked assembly of a plurality of modules (32, 33, 36) according to claim 1, wherein said stacked assembly forms a movement (3) of said timepiece (1).
  6. Timepiece according to claim 5, characterised in that said zone (85) penetrates said first element (34) so as to plastically deform said first element and has a portion (86) of slightly greater diameter than the diameter of the assembly orifice (34a) in which it is inserted.
  7. Timepiece according to claim 6, characterised in that said portion (86) is of substantially conical shape.
  8. Timepiece according to claims 5 to 7, characterised in that said modules (32, 33, 36) are assembled by plastically deforming the ends (26) of said mounting pins (24).
  9. Timepiece according to any one of claims 5 to 8, characterised in that said timepiece (1) is an electromechanical timepiece and in that the distance (d1) between said first and second reference surfaces is determined so as to assure a clearance allowing wheels (75, 76) of the timepiece movement (3) to rotate.
  10. Timepiece according to any one of claims 5 to 9, characterised in that said mounting pins (24) are in a single piece with a back cover (22) of said case (2).
  11. Timepiece according to claim 10, characterised in that said timepiece (1) is an electromechanical timepiece and in that said assembly includes a successive stack, on said back cover (22), of a lower plate (32), an electronic module (33) including in particular a printed circuit board (34) and forming said first element of non-guaranteed thickness (e), and a motor module (36) including in particular at least a motor (6, 7) driving analogue display members.
  12. Timepiece according to claim 11, characterised in that a coil (63, 73) of said motor (6, 7) is further assembled by means of said mounting pins (24) between said printed circuit board (34) and a corresponding stator (62, 72) of said motor (6, 7), said coil (63, 73) being secured to said printed circuit board (34) of the electronic module (33) by means of said stepped tubes (8).
  13. Timepiece according to any one of claims 5 to 12, characterised in that said mounting pins (24) are made of a plastic material.
  14. Timepiece according to any one of claims 5 to 13, characterised in that said stepped tubes (8) are made of a material having low magnetic permeability, such as brass.
EP00204244A 2000-11-29 2000-11-29 Assembling by piling a plurality of modules forming an electromagnetic device, in particular for an ultra thin time piece Expired - Lifetime EP1211578B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00204244A EP1211578B1 (en) 2000-11-29 2000-11-29 Assembling by piling a plurality of modules forming an electromagnetic device, in particular for an ultra thin time piece
AT00204244T ATE478364T1 (en) 2000-11-29 2000-11-29 ASSEMBLY OF AN ELECTROMAGNETIC DEVICE BY STACKING SEVERAL MODULES, ESPECIALLY FOR AN EXTREMELY THIN CLOCK MOVEMENT
DE60044850T DE60044850D1 (en) 2000-11-29 2000-11-29 Assembly of an electromagnetic device by stacking a plurality of modules, in particular for a very thin movement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00204244A EP1211578B1 (en) 2000-11-29 2000-11-29 Assembling by piling a plurality of modules forming an electromagnetic device, in particular for an ultra thin time piece

Publications (2)

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EP1211578A1 EP1211578A1 (en) 2002-06-05
EP1211578B1 true EP1211578B1 (en) 2010-08-18

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EP00204244A Expired - Lifetime EP1211578B1 (en) 2000-11-29 2000-11-29 Assembling by piling a plurality of modules forming an electromagnetic device, in particular for an ultra thin time piece

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AT (1) ATE478364T1 (en)
DE (1) DE60044850D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2605087B1 (en) 2011-12-13 2017-07-26 ETA SA Manufacture Horlogère Suisse Modular clock assembly with functional modules
EP2605079B1 (en) 2011-12-13 2014-10-01 ETA SA Manufacture Horlogère Suisse Modular clock movement with functional modules
CH711297B1 (en) 2015-07-07 2021-04-30 Soprod Sa Watch module and electromechanical watch comprising such a watch module.
EP4018269B1 (en) 2020-05-28 2022-12-07 Soprod SA Analogue display module for watches

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53147575A (en) * 1977-05-28 1978-12-22 Citizen Watch Co Ltd Disposition structure of analog crystal wristwatches
JPS55152487A (en) * 1979-05-16 1980-11-27 Seiko Epson Corp Crystal wrist watch
CH680252B5 (en) * 1990-08-21 1993-01-29 Ebauchesfabrik Eta Ag
DE69718788D1 (en) * 1997-10-01 2003-03-06 Eta S A Fabriques D Ebauches G Device for fastening a part on a housing base

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ATE478364T1 (en) 2010-09-15
DE60044850D1 (en) 2010-09-30

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