EP1035453A1 - Dial comprising brilliants, applied ornaments or other attached elements and process for fixing such elements onto such a dial - Google Patents

Dial comprising brilliants, applied ornaments or other attached elements and process for fixing such elements onto such a dial Download PDF

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Publication number
EP1035453A1
EP1035453A1 EP99104416A EP99104416A EP1035453A1 EP 1035453 A1 EP1035453 A1 EP 1035453A1 EP 99104416 A EP99104416 A EP 99104416A EP 99104416 A EP99104416 A EP 99104416A EP 1035453 A1 EP1035453 A1 EP 1035453A1
Authority
EP
European Patent Office
Prior art keywords
dial
adhesive tape
adhesive
plate
openings
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
EP99104416A
Other languages
German (de)
French (fr)
Other versions
EP1035453B1 (en
Inventor
Christophe Bossel
Erwin Koelbl
Grégoire Iten
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 Manufacture Horlogere Suisse SA
Original Assignee
ETA Manufacture Horlogere Suisse SA
Ebauchesfabrik ETA AG
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Publication date
Application filed by ETA Manufacture Horlogere Suisse SA, Ebauchesfabrik ETA AG filed Critical ETA Manufacture Horlogere Suisse SA
Publication of EP1035453A1 publication Critical patent/EP1035453A1/en
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Publication of EP1035453B1 publication Critical patent/EP1035453B1/en
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
    • G04B19/103—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial attached or inlaid numbers
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
    • 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
    • G04B47/00—Time-pieces combined with other articles which do not interfere with the running or the time-keeping of the time-piece
    • G04B47/04—Time-pieces combined with other articles which do not interfere with the running or the time-keeping of the time-piece with attached ornaments or amusement apparatus
    • G04B47/042—Fastening of jewels and the like
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0048—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for dials

Definitions

  • the invention relates to a dial comprising brilliants, appliques or other added elements and more particularly a clock face comprising such decorative elements having a base surface plane.
  • the invention also relates to a method of fixing decorative elements. reported on a dial.
  • a first technique for manufacturing these dials is to fix decorative elements, usually cut stones, between two rings each presenting a seat, and driving the assembly thus formed into a drilling the dial.
  • Such a technique is for example described in the document CH 260 123.
  • this technique has the disadvantage of having to make and handle many very small parts, which requires a skilled workforce and leads to cost prices high.
  • a first drawback is that the bonding of the elements decorative is difficult to achieve automatically due to the low dimensions of the decorative elements in question.
  • the brilliant commonly used to form time signs exhibit diameters of the order of 2 mm. Bonding operations for each element decorative, between one and twelve per dial depending on the case, must be made manually, which significantly increases manufacturing costs of these dials.
  • a second drawback is that it is difficult to dose precisely the quantity of glue to be deposited in each recess to make a satisfactory collage, that is to say a collage during which the amount of glue deposited is neither too large, which would risk to cause an overflow on the useful face of the dial when setting place of the decorative element, or insufficient, which could cause a separation during subsequent use.
  • the main object of the invention is therefore to provide a dial, such as a clock face, including decorative elements which is either simple and inexpensive to manufacture.
  • the invention also aims to provide a method of fixing decorative elements on a dial, this process allowing a secure fixing decorative elements on the dial while being easily industrializable and simple to implement.
  • the invention relates to a dial, in particular for a coin timepiece, comprising a plate having at least one housing in which is attached a decorative element or the like, characterized in that the housing comprises a bottom formed by an adhesive tape, the adhesive face of said ribbon being in contact with said decorative element.
  • reference 1 denotes a dial formed by a disc of metal or rigid plastic material comprising a visible front face 2 and an opposite face 4 called rear face. This disc is typically obtained by stamping a plate, using a die and an appropriately shaped punch.
  • Dial 1 according to the invention includes circular housings 6 on the bottom of which are fixed decorative elements 8 appearing on the front face 2.
  • the dial 1 also conventionally includes a hole 10 provided for the passage needles (not shown).
  • the term “decorative element” means a gloss, a wall lamp or any other decorative element that can be attached to a dial and in particular a clock face.
  • the decorative elements 8 have been provided respectively for twelve o'clock, three o'clock, six o'clock and nine o'clock positions to constitute time signs, it stands to reason that these decorative elements could be arranged in any other place on the dial insofar as they do not interfere not with the central hole 10 provided for the passage of the needles.
  • the housings 6 are formed by openings 12 passing right through the thickness of the plate forming the dial 1, these openings 12 each being closed by a bottom 14 formed from a portion of adhesive tape 16 glued to the rear face 4 of the dial 1.
  • the openings 12 have dimensions substantially greater than those of the decorative elements 8, which makes it easier to install the decorative elements in the housings 6.
  • the adhesive side of the tape 16 forming the bottom 14 is in close contact with the base 18 of the element decorative 8, which thus ensures the fixing of this element 8, on the dial 1.
  • the openings typically have a diameter of around 2 mm, the dial has a thickness of around 0.4 mm and the adhesive tape has a thickness of the order of 0.05 mm.
  • the adhesive tape 10 is for example a tape known as Scotch 850 or Scotch 396 trade names sold by the company 3M or under the trade designation Tesa film 4129 sold by the TESA company.
  • the adhesive tape 16 used is common to all of the housings 6 and for this purpose has a width sufficient to form a bottom 14 simultaneously for all the openings 12 of the dial.
  • the ribbon 16 has a width allowing cover at least the entire rear face 4 of the dial 1.
  • the adhesive tape 16 can have adhesive material on both sides and thus ensure also keeping the dial 1 in place in the watch case.
  • the decorative element 8 is presented under the shape of a rectangular gloss housed in a housing 6 of shape corresponding.
  • the gloss 8 is fixed to the bottom 14 by means of a ribbon adhesive 16 glued to the back of the dial.
  • the decorative element 8 is present in the form of a stick with a T-shaped cross section, the upper part 8a extends beyond the periphery of the opening 12 in which is housed the lower part 8b.
  • This lower part 8b comprises a flat bottom 18 which comes into close contact with the adhesive face of the tape adhesive 16 bonded to the rear face 4 of the dial 1.
  • the stick 8 is by example made of silver plastic material of ceramic or the like and advantageously forms time signs with an original appearance.
  • This embodiment has the advantage of being able to hide the space free located between the decorative element 8 and the edge of the opening 12 which is normally visible in the case of dials with elements decorative such as brilliants or the like.
  • the plate P ( Figure 6) in which will be stamped a plurality of dials is for example cut from a coil (not shown) and supplied to a conventional stamping station also not shown.
  • Plate P comprises a determined number of dials, typically one half a dozen.
  • the punch and the die are provided for simultaneously forming a hole 10 in the stamping of the openings 12 substantially in the center of each dial 1 to allow passage the axes on which the points of the workpiece will be fixed of watchmaking that the dials are intended to equip.
  • indexing and drive holes 20 for ensuring precise positioning of the plate for subsequent operations as well as perforations for positioning the dial in the watch case. These perforations are conventionally made at six o'clock on the edge of the dial.
  • dials 2 are cut out of the plate P, so that each of these substrates is connected to the rest of the plate by four bridges of material 22.
  • the number and dimensions of the bridges of material 22 vary depending on the shape and the material from which the dial. Typically, the bridges are such that they later allow easy extraction of dials from the band, for example by a simple pressure on these.
  • re-banding stamped dials that is to say replace the dials 1 in the plate P at the places where they were cut, the dials 1 being held in the plate P by microwelds which spontaneously create when the stamped part is driven into the place of the P band from which it comes.
  • the adhesive tape 16 is prepared which will subsequently be glued to the rear face 4 of the dials 1.
  • the length and width of the ribbon section 16 correspond to those on plate P.
  • Figure 7 the different elements of the ribbon 16 corresponding to those of plate P by the same reference numeral with the letter r.

Abstract

The system uses stamped holes in the dial to ensure accurate alignment of markers on the face. The dial (1) for a clock or watch comprises a plate in which a number of apertures (6) are provided. Each aperture is intended to receive a decorative element (8). The apertures each have a base defined by an adhesive ribbon (16) whose adhesive surfaces makes contact with the decorative element. The adhesive ribbon is glued to the reverse side of the dial over an area which is larger than that of the aperture. The adhesive tape may be of the order of 50 micro-meters thick, and may also be adhesive on both sides. The apertures in the dial may be formed by stamping the sheet material.

Description

L'invention concerne un cadran comportant des brillants, appliques ou autres éléments rapportés et plus particulièrement un cadran d'horlogerie comportant de tels éléments décoratifs présentant une surface de base plane. L'invention concerne aussi un procédé de fixation d'éléments décoratifs rapportés sur un cadran.The invention relates to a dial comprising brilliants, appliques or other added elements and more particularly a clock face comprising such decorative elements having a base surface plane. The invention also relates to a method of fixing decorative elements. reported on a dial.

On connaít déjà des cadrans d'horlogerie présentant sur une de leurs faces des éléments décoratifs rapportés destinés à former des signes horaires.We already know clock faces presenting on one of their faces of the decorative elements intended to form signs hours.

Une première technique de fabrication de ces cadrans consiste à fixer les éléments décoratifs, généralement des pierres taillées, entre deux bagues présentant chacune un siège, et à chasser l'ensemble ainsi formé dans un perçage du cadran. Une telle technique est par exemple décrite dans le document CH 260 123. Cette technique présente toutefois l'inconvénient de devoir réaliser et manipuler de nombreuses pièces de très faibles dimensions, ce qui nécessite une main d'oeuvre qualifiée et conduit à des prix de revient élevés.A first technique for manufacturing these dials is to fix decorative elements, usually cut stones, between two rings each presenting a seat, and driving the assembly thus formed into a drilling the dial. Such a technique is for example described in the document CH 260 123. However, this technique has the disadvantage of having to make and handle many very small parts, which requires a skilled workforce and leads to cost prices high.

Une autre technique de fixation classique d'éléments décoratifs comportant une surface de base plane consiste à coller, à l'aide d'une colle liquide ou semi-liquide, les éléments décoratifs par leur surface de base dans des creusures fraisées dans l'épaisseur du cadran à des endroits prédéterminés. Celle technique bien que moins coûteuse que la précédente présente toutefois de nombreux inconvénients.Another classic technique for fixing decorative elements with a flat base surface consists of gluing, using an adhesive liquid or semi-liquid, the decorative elements by their base surface in countersinks in the thickness of the dial in places predetermined. The technical one although less expensive than the previous one has many drawbacks, however.

En effet, un premier inconvénient est que le collage des éléments décoratifs est difficile à réaliser de façon automatisée en raison des faibles dimensions des éléments décoratifs en question. A titre indicatif, les brillants couramment utilisés pour former les signes horaires présentent des diamètres de l'ordre de 2 mm. Les opérations de collage de chaque élément décoratif, entre une et douze par cadran selon les cas, doivent être réalisées manuellement, ce qui augmente de façon importante les coûts de fabrication de ces cadrans.Indeed, a first drawback is that the bonding of the elements decorative is difficult to achieve automatically due to the low dimensions of the decorative elements in question. As an indication, the brilliant commonly used to form time signs exhibit diameters of the order of 2 mm. Bonding operations for each element decorative, between one and twelve per dial depending on the case, must be made manually, which significantly increases manufacturing costs of these dials.

Un deuxième inconvénient réside dans le fait qu'il est difficile de doser de façon précise la quantité de colle à déposer dans chaque creusure pour réaliser un collage satisfaisant, c'est à dire un collage au cours duquel la quantité de colle déposée n'est ni trop importante, ce qui risquerait d'entraíner un débordement sur la face utile du cadran lors de la mise en place de l'élément décoratif, ni insuffisante, ce qui risquerait d'entraíner une désolidarisation au cours de l'utilisation ultérieure.A second drawback is that it is difficult to dose precisely the quantity of glue to be deposited in each recess to make a satisfactory collage, that is to say a collage during which the amount of glue deposited is neither too large, which would risk to cause an overflow on the useful face of the dial when setting place of the decorative element, or insufficient, which could cause a separation during subsequent use.

Ce procédé est par ailleurs particulièrement désavantageux lorsque de tels cadrans sont montés dans des boítes de montre monobloc en matière plastique fermées par une glace soudée par ultrasons. En effet, la demanderesse a constaté que, lors de l'opération de soudage de la glace sur la boíte, les vibrations ultrasonore se propageaient jusque dans la colle fixant les éléments décoratifs sur le cadran, et avaient tendance à fissurer et rompre la couche de colle et détacher intempestivement lesdits éléments décoratifs de leurs sièges.This process is also particularly disadvantageous when such dials are mounted in one-piece watch cases made of material plastic closed by a glass welded by ultrasound. Indeed, the Applicant has found that, during the operation of welding the ice to the box, the ultrasonic vibrations propagated into the glue fixing the decorative elements on the dial, and tended to crack and break the layer of glue and untimely detach said elements decorative of their seats.

Les procédés connus présentent donc des problèmes généraux d'industrialisation qu'il convient de supprimer.The known methods therefore present general problems industrialization that should be eliminated.

L'invention a donc pour but principal de fournir un cadran, tel qu'un cadran d'horlogerie, comportant des éléments décoratifs rapportés qui soit simple et peu coûteux à fabriquer.The main object of the invention is therefore to provide a dial, such as a clock face, including decorative elements which is either simple and inexpensive to manufacture.

L'invention a également pour but de fournir un procédé de fixation d'éléments décoratifs sur un cadran, ce procédé permettant une fixation sûre des éléments décoratifs sur le cadran tout en étant facilement industrialisable et simple à mettre en oeuvre.The invention also aims to provide a method of fixing decorative elements on a dial, this process allowing a secure fixing decorative elements on the dial while being easily industrializable and simple to implement.

A cet effet, l'invention a pour objet un cadran, notamment pour pièce d'horlogerie, comprenant une plaque présentant au moins un logement dans lequel est fixé un élément décoratif ou analogue, caractérisé en ce que le logement comprend un fond formé d'un ruban adhésif, la face adhésive dudit ruban étant en contact avec ledit élément décoratif.To this end, the invention relates to a dial, in particular for a coin timepiece, comprising a plate having at least one housing in which is attached a decorative element or the like, characterized in that the housing comprises a bottom formed by an adhesive tape, the adhesive face of said ribbon being in contact with said decorative element.

Grâce à ces caractéristiques, les vibrations ultrasonores peuvent être amorties par les caractéristiques de souplesse intrinsèques du ruban et ainsi éliminer les problèmes de rupture de la couche de colle retenant les éléments décoratifs sur le cadran.Thanks to these characteristics, ultrasonic vibrations can be damped by the intrinsic flexibility characteristics of the ribbon and thus eliminate the problems of rupture of the adhesive layer retaining the elements decorative on the dial.

L'invention a également pour objet un procédé de fixation d'éléments décoratifs sur un cadran, caractérisé en ce qu'il comprend les étapes consistant à:

  • se munir d'un cadran ou d'une plaque dans laquelle seront découpés une pluralité de cadrans;
  • pratiquer dans ledit cadran ou ladite plaque, aux endroits destinés à recevoir lesdits éléments décoratifs, des ouvertures traversant l'épaisseur du cadran ou de ladite plaque;
  • appliquer un ruban adhésif sur la face inférieure du cadran ou de ladite plaque, de sorte que la face du ruban adhésif comportant la matière adhésive soit dirigée vers lesdites ouvertures,
  • poser lesdits éléments décoratifs dans les ouvertures pour qu'ils viennent se coller par une de leurs faces sur la face adhésive du ruban.
The invention also relates to a method of fixing decorative elements to a dial, characterized in that it comprises the steps consisting in:
  • have a dial or a plate from which a plurality of dials will be cut;
  • making in said dial or said plate, at the places intended to receive said decorative elements, openings passing through the thickness of the dial or of said plate;
  • applying an adhesive tape to the underside of the dial or of said plate, so that the face of the adhesive tape comprising the adhesive material is directed towards said openings,
  • place said decorative elements in the openings so that they come to stick by one of their faces on the adhesive face of the tape.

Grâce à ces caractéristiques, tous les problèmes liés à l'usinage des creusures et au dosage de colle de l'art antérieur sont éliminés, et l'on peut fixer les éléments décoratifs de façon aisée par simple application de ces derniers sur le fond, formé par la face encollée du ruban adhésif, des ouvertures du cadran prévues à cet effet.Thanks to these characteristics, all the problems linked to the machining of gaps and glue dosage of the prior art are eliminated, and one can fix the decorative elements easily by simple application of these last on the bottom, formed by the glued side of the adhesive tape, dial openings provided for this purpose.

D'autres avantages et caractéristiques de l'invention apparaítront à la lumière de la description suivante d'un mode de réalisation préféré, présenté à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en plan d'un cadran selon l'invention;
  • la figure 2 est une coupe selon la ligne I-I de la figure 1;
  • la figure 3 est une vue en plan partielle d'une variante de réalisation du cadran de l'invention;
  • la figure 4 est une vue en plan partielle d'une autre variante de réalisation du cadran de l'invention;
  • la figure 5 est une coupe selon la ligne IV-IV de la figure 4;
  • la figure 6 est vue en perspective d'une plaque dans laquelle une pluralité de cadrans selon l'invention sont étampés, la plaque étant représentée avant l'opération de collage du ruban adhésif, et
  • la figure 7 et une vue en perspective d'un ruban adhésif étampé selon l'invention avant l'opération de collage sur la plaque comprenant les cadrans.
Other advantages and characteristics of the invention will become apparent in the light of the following description of a preferred embodiment, presented by way of nonlimiting example with reference to the appended drawings in which:
  • Figure 1 is a plan view of a dial according to the invention;
  • Figure 2 is a section along line II of Figure 1;
  • Figure 3 is a partial plan view of an alternative embodiment of the dial of the invention;
  • Figure 4 is a partial plan view of another alternative embodiment of the dial of the invention;
  • Figure 5 is a section along the line IV-IV of Figure 4;
  • FIG. 6 is a perspective view of a plate in which a plurality of dials according to the invention are stamped, the plate being shown before the operation of gluing the adhesive tape, and
  • Figure 7 and a perspective view of a stamped adhesive tape according to the invention before the bonding operation on the plate comprising the dials.

En se référant tout d'abord à la figure 1, la référence 1 désigne un cadran formé d'un disque en métal ou en un matériau plastique rigide comportant une face avant 2 visible et une face opposée 4 dite face arrière. Ce disque est typiquement obtenu par étampage d'une plaque, à l'aide d'une matrice et d'un poinçon de forme appropriée. Le cadran 1 selon l'invention comprend des logements circulaires 6 sur le fond desquels sont fixés des éléments décoratifs 8 apparaissant sur la face avant 2. Le cadran 1 comprend également classiquement un trou 10 prévu pour le passage d'aiguilles (non représentées). Referring first to Figure 1, reference 1 denotes a dial formed by a disc of metal or rigid plastic material comprising a visible front face 2 and an opposite face 4 called rear face. This disc is typically obtained by stamping a plate, using a die and an appropriately shaped punch. Dial 1 according to the invention includes circular housings 6 on the bottom of which are fixed decorative elements 8 appearing on the front face 2. The dial 1 also conventionally includes a hole 10 provided for the passage needles (not shown).

Dans la description qui suit, on entend par élément décoratif un brillant, une applique ou tout autre élément décoratif que l'on peut rapporter sur un cadran et notamment un cadran d'horlogerie. Bien que dans l'exemple illustré à la figure 1, les éléments décoratifs 8 ont été prévus respectivement aux positions douze heures, trois heures, six heures et neuf heures pour constituer des signes horaires, il va de soi que ces éléments décoratifs pourraient être disposés à tout autre endroit sur le cadran dans la mesure où ils n'interfèrent pas avec le trou central 10 prévu pour le passage des aiguilles.In the following description, the term “decorative element” means a gloss, a wall lamp or any other decorative element that can be attached to a dial and in particular a clock face. Although in the example illustrated in FIG. 1, the decorative elements 8 have been provided respectively for twelve o'clock, three o'clock, six o'clock and nine o'clock positions to constitute time signs, it stands to reason that these decorative elements could be arranged in any other place on the dial insofar as they do not interfere not with the central hole 10 provided for the passage of the needles.

Comme cela ressort de la figure 2, les logements 6 sont formés par des ouvertures 12 traversant de part en part l'épaisseur de la plaque formant le cadran 1, ces ouvertures 12 étant chacune fermées par un fond 14 formé d'une portion de ruban adhésif 16 collé sur la face arrière 4 du cadran 1. Les ouvertures 12 ont des dimensions sensiblement supérieures à celles des éléments décoratifs 8, ce qui permet de faciliter la pose des éléments décoratifs dans les logements 6. La face adhésive du ruban 16 formant le fond 14 est en contact étroit avec la base 18 de l'élément décoratif 8, ce qui assure ainsi la fixation de cet élément 8, sur le cadran 1.As can be seen from FIG. 2, the housings 6 are formed by openings 12 passing right through the thickness of the plate forming the dial 1, these openings 12 each being closed by a bottom 14 formed from a portion of adhesive tape 16 glued to the rear face 4 of the dial 1. The openings 12 have dimensions substantially greater than those of the decorative elements 8, which makes it easier to install the decorative elements in the housings 6. The adhesive side of the tape 16 forming the bottom 14 is in close contact with the base 18 of the element decorative 8, which thus ensures the fixing of this element 8, on the dial 1.

On notera à ce propos qu'il est avantageux de choisir des éléments décoratifs 8 comportant une base 18 sensiblement plane et ceci pour augmenter la surface de l'élément 8 venant en contact avec la matière adhésive du ruban 16. On notera en outre qu'il est avantageux de choisir un ruban adhésif 16 ayant une épaisseur aussi faible que possible afin de ne pas augmenter l'épaisseur totale du cadran 1 compte tenu de l'espace généralement faible disponible pour celui-ci dans une boíte de montre et de la tendance générale à la réalisation de montres de relativement faible épaisseur.Note in this regard that it is advantageous to choose elements decorative 8 having a substantially flat base 18 and this for increase the surface of the element 8 coming into contact with the material adhesive tape 16. It will further be noted that it is advantageous to choose a adhesive tape 16 having a thickness as small as possible so as not to increase the total thickness of dial 1 taking into account the space generally low available for this one in a watch box and the general trend towards making watches of relatively low thickness.

Pour fixer les idées, les ouvertures ont typiquement un diamètre de l'ordre de 2 mm, le cadran présente une épaisseur de l'ordre de 0.4 mm et le ruban adhésif présente une épaisseur de l'ordre de 0,05 mm.To fix ideas, the openings typically have a diameter of around 2 mm, the dial has a thickness of around 0.4 mm and the adhesive tape has a thickness of the order of 0.05 mm.

Le ruban adhésif 10 est par exemple un ruban connu sous les désignations commerciales Scotch 850 ou Scotch 396 vendus par la société 3M ou encore sous la désignation commerciale Tesa film 4129 vendu par la société TESA.The adhesive tape 10 is for example a tape known as Scotch 850 or Scotch 396 trade names sold by the company 3M or under the trade designation Tesa film 4129 sold by the TESA company.

Selon un mode de réalisation préféré, le ruban adhésif 16 utilisé est commun à l'ensemble des logements 6 et présente à cet effet une largeur suffisante pour former un fond 14 simultanément pour toutes les ouvertures 12 du cadran. A cet effet, le ruban 16 présente une largeur permettant de recouvrir au moins la totalité de la face arrière 4 du cadran 1.According to a preferred embodiment, the adhesive tape 16 used is common to all of the housings 6 and for this purpose has a width sufficient to form a bottom 14 simultaneously for all the openings 12 of the dial. To this end, the ribbon 16 has a width allowing cover at least the entire rear face 4 of the dial 1.

Selon une variante non représentée, le ruban adhésif 16 peut comporter de la matière adhésive sur ses deux faces et ainsi assurer également le maintien en place du cadran 1 dans la boíte de montre.According to a variant not shown, the adhesive tape 16 can have adhesive material on both sides and thus ensure also keeping the dial 1 in place in the watch case.

Aux figures 3 à 5 on a représenté deux variantes de réalisation d'un cadran selon l'invention. Les éléments identiques à ceux déjà décrits en liaison avec les figures 1 et 2 sont désignés par les mêmes références numériques.In Figures 3 to 5 there are shown two alternative embodiments of a dial according to the invention. Elements identical to those already described in connection with Figures 1 and 2 are designated by the same reference numerals.

Dans l'exemple de la figure 3, l'élément décoratif 8 se présente sous la forme d'un brillant rectangulaire logé dans un logement 6 de forme correspondante. Le brillant 8 est fixé sur le fond 14 au moyen d'un ruban adhésif 16 collé sur la face arrière du cadran.In the example of FIG. 3, the decorative element 8 is presented under the shape of a rectangular gloss housed in a housing 6 of shape corresponding. The gloss 8 is fixed to the bottom 14 by means of a ribbon adhesive 16 glued to the back of the dial.

Dans l'exemple représenté aux figures 4 et 5, l'élément décoratif 8 se présente sous la forme d'un bâtonnet à section transversale en T dont la partie supérieure 8a s'étend au delà de la périphérie de l'ouverture 12 dans laquelle est logée la partie inférieure 8b. Cette partie inférieure 8b comporte un fond plat 18 qui vient en contact étroit avec la face adhésive du ruban adhésif 16 collé sur la face arrière 4 du cadran 1. Le bâtonnet 8 est par exemple réalisé en matériau plastique argenté en céramique ou analogue et forme avantageusement des signes horaires présentant un aspect original. Cette forme d'exécution présente l'avantage de pouvoir masquer l'espace libre situé entre l'élément décoratif 8 et le bord de l'ouverture 12 qui est normalement visible dans le cas de cadrans comportant des éléments décoratifs tels que des brillants ou analogues.In the example shown in Figures 4 and 5, the decorative element 8 is present in the form of a stick with a T-shaped cross section, the upper part 8a extends beyond the periphery of the opening 12 in which is housed the lower part 8b. This lower part 8b comprises a flat bottom 18 which comes into close contact with the adhesive face of the tape adhesive 16 bonded to the rear face 4 of the dial 1. The stick 8 is by example made of silver plastic material of ceramic or the like and advantageously forms time signs with an original appearance. This embodiment has the advantage of being able to hide the space free located between the decorative element 8 and the edge of the opening 12 which is normally visible in the case of dials with elements decorative such as brilliants or the like.

On va maintenant décrire le procédé de fixation d'éléments décoratifs sur un cadran selon l'invention en liaison avec les figures 6 et 7.We will now describe the method of fixing decorative elements. on a dial according to the invention in conjunction with FIGS. 6 and 7.

La plaque P (figure 6) dans laquelle seront étampés une pluralité de cadrans est par exemple découpée à partir d'une bobine (non représentée) et fournie à un poste d'étampage classique également non représenté.The plate P (Figure 6) in which will be stamped a plurality of dials is for example cut from a coil (not shown) and supplied to a conventional stamping station also not shown.

Au cours d'une première étape, on pratique par étampage dans la plaque P, aux endroits destinés à recevoir des éléments décoratifs 8, des ouvertures 12 traversant de part en part l'épaisseur de la plaque (figure 6). La plaque P comprend un nombre déterminé de cadrans, typiquement une demi-douzaine.During a first step, we practice by stamping in the plate P, at the places intended to receive decorative elements 8, openings 12 passing right through the thickness of the plate (Figure 6). Plate P comprises a determined number of dials, typically one half a dozen.

Dans ce cas particulier, le poinçon et la matrice sont prévus pour former simultanément à l'étampage des ouvertures 12 un perçage 10 sensiblement au centre de chaque cadran 1 pour permettre le passage ultérieur des axes sur lesquels seront fixées les aiguilies de la pièce d'horlogerie que les cadrans sont destinés à équiper. On prévoit également des perforations 20 d'indexage et d'entraínement permettant d'assurer un positionnement précis de la plaque pour des opérations ultérieures ainsi que des perforations de positionnement du cadran dans la boíte de montre. Ces perforations sont classiquement ménagées à six heures sur le bord du cadran.In this particular case, the punch and the die are provided for simultaneously forming a hole 10 in the stamping of the openings 12 substantially in the center of each dial 1 to allow passage the axes on which the points of the workpiece will be fixed of watchmaking that the dials are intended to equip. There are also plans indexing and drive holes 20 for ensuring precise positioning of the plate for subsequent operations as well as perforations for positioning the dial in the watch case. These perforations are conventionally made at six o'clock on the edge of the dial.

On notera également que les cadrans 2 sont découpés dans la plaque P, de sorte que chacun de ces substrats est relié au reste de la plaque par quatre ponts de matière 22. Le nombre et les dimensions des ponts de matière 22 varient en fonction de la forme et de la matière dont est réalisé le cadran. Typiquement, les ponts sont tels qu'ils permettent ultérieurement une extraction aisée des cadrans de la bande, par exemple par une simple pression sur ceux-ci.Note also that the dials 2 are cut out of the plate P, so that each of these substrates is connected to the rest of the plate by four bridges of material 22. The number and dimensions of the bridges of material 22 vary depending on the shape and the material from which the dial. Typically, the bridges are such that they later allow easy extraction of dials from the band, for example by a simple pressure on these.

Selon une variante, on pourrait également envisager d'utiliser une technique dite de remise en bande des cadrans étampés, c'est-à-dire de replacer dans la plaque P les cadrans 1 aux endroits où ils ont été découpés, les cadrans 1 étant maintenus dans la plaque P par des microsoudures qui se créent spontanément lorsque la pièce étampée est chassée dans l'endroit de la bande P dont elle provient.Alternatively, one could also consider using a technique called re-banding stamped dials, that is to say replace the dials 1 in the plate P at the places where they were cut, the dials 1 being held in the plate P by microwelds which spontaneously create when the stamped part is driven into the place of the P band from which it comes.

Il va de soi que d'autres moyens de découpage pourraient être envisagés. On mentionnera à ce propos notamment le découpage par faisceau laser et le découpage par jet d'eau à haute pression.It goes without saying that other means of cutting could be considered. We will mention in this regard in particular the cutting by laser beam and high pressure water jet cutting.

Au cours d'une étape parallèle, on prépare le ruban adhésif 16 qui va être par la suite collé sur la face arrière 4 des cadrans 1. Pour ce faire, on découpe une section de ruban 16 à partir d'un rouleau qui alimente un poste d'étampage. La longueur et la largeur de la section de ruban 16 correspondent à celles la plaque P. On découpe dans le poste d'étampage des formes correspondantes à celles des cadrans 2 découpés dans la plaque P à l'exception des ouvertures 12. Ces formes sont bien entendu découpées en disposition et en nombre correspondant à ce qui a été réalisé sur la plaque P. On a désigné à la figure 7 les différents éléments du ruban 16 correspondant à ceux de la plaque P par la même référence numérique assortie de la lettre r.During a parallel step, the adhesive tape 16 is prepared which will subsequently be glued to the rear face 4 of the dials 1. To do this, cut a section of ribbon 16 from a roll which feeds a station stamping. The length and width of the ribbon section 16 correspond to those on plate P. We cut in the stamping station shapes corresponding to those of the dials 2 cut from the plate P with the exception of the openings 12. These shapes are of course cut out in layout and number corresponding to what has been achieved on the plate P. We have designated in Figure 7 the different elements of the ribbon 16 corresponding to those of plate P by the same reference numeral with the letter r.

Au cours d'une étape suivante, on applique sur la face arrière de la plaque P le ruban adhésif 16, de sorte que la face de ce ruban 16 comportant la matière adhésive est dirigée vers les ouvertures 12. L'application du ruban 16 peut bien entendu être réalisée de manière automatique.In a next step, apply to the back of the plate P the adhesive tape 16, so that the face of this tape 16 comprising the adhesive material is directed towards the openings 12. The application of the tape 16 can of course be carried out so automatic.

Dans la dernière étape du procédé, on vient poser les éléments décoratifs 8 dans le fond 14 des ouvertures 12 et on leur applique une légère pression pour qu'ils viennent en contact étroit par une de leurs faces avec la face adhésive du ruban 16 et ainsi assurer leur fixation par collage dans les logements 6 des cadrans 2. La pose des éléments décoratifs 8 est de préférence réalisée de manière automatique.In the last step of the process, we just put the elements decorative 8 in the bottom 14 of the openings 12 and we apply a slight pressure so that they come into close contact by one of their faces with the adhesive side of the tape 16 and thus ensure their fixing by gluing in the housings 6 of the dials 2. The fitting of the decorative elements 8 is preference performed automatically.

Il va de soi que les étapes qui viennent d'être décrites s'appliquent au traitement de cadrans unitaires.It goes without saying that the steps which have just been described apply to the treatment of unitary dials.

L'avantage essentiel du procédé décrit ci-dessus réside dans le fait qu'il est particulièrement simple, de sorte qu'il peut être aisément automatisé. Par ailleurs, les essais faits par la demanderesse ont conduit à des résultats confirmant la fiabilité de la fixation des éléments décoratifs 8 sur le cadran 2. Le taux de déchet des cadrans ainsi réalisés a pu être réduit de façon importante par rapport aux techniques de fixation de l'art antérieur.The essential advantage of the process described above resides in the fact that it is particularly simple, so it can be easily automated. Through elsewhere, the tests carried out by the applicant have led to results confirming the reliability of the attachment of the decorative elements 8 to the dial 2. The rate of waste of the dials thus produced could be reduced so important compared to the fixing techniques of the prior art.

Claims (10)

Cadran, notamment pour pièce d'horlogerie, comprenant une plaque présentant au moins un logement (6) dans lequel est fixé un élément décoratif (8) ou analogue, caractérisé en ce que le logement (6) comprend un fond (14) formé d'un ruban adhésif (16), la face adhésive dudit ruban (16) étant en contact avec ledit élément décoratif (8).Dial, in particular for a timepiece, comprising a plate having at least one housing (6) in which is fixed an element decorative (8) or the like, characterized in that the housing (6) comprises a bottom (14) formed of an adhesive tape (16), the adhesive face of said tape (16) being in contact with said decorative element (8). Cadran selon la revendication 1, caractérisé en ce que le logement (6) est formé par une ouverture (12) percée de part en part dans l'épaisseur du cadran (1), l'ouverture étant fermée par le ruban adhésif (16) collé sur la face arrière (4) du cadran (1).Dial according to claim 1, characterized in that the housing (6) is formed by an opening (12) pierced right through in the thickness of the dial (1), the opening being closed by the adhesive tape (16) stuck on the rear face (4) of the dial (1). Cadran selon la revendication 1 ou 2, caractérisé en ce que le ou les éléments décoratifs (8) présentent un fond au moins en partie sensiblement plat (18).Dial according to claim 1 or 2, characterized in that the or the decorative elements (8) have a bottom at least in part substantially flat (18). Cadran selon l'une des revendications 1 à 3, caractérisé en ce que le ruban adhésif (16) présente une largeur suffisante pour recouvrir la totalité de la face arrière (4) du cadran (1).Dial according to one of claims 1 to 3, characterized in that the adhesive tape (16) has a width sufficient to cover all of it of the rear face (4) of the dial (1). Cadran selon l'une des revendications 1 à 4, caractérisé en ce que lesdites ouvertures (12) ont des dimensions sensiblement supérieures à celles des éléments décoratifs (8).Dial according to one of claims 1 to 4, characterized in that said openings (12) have dimensions substantially greater than those decorative elements (8). Cadran selon l'une des revendications 1 à 5, caractérisé en ce que le ruban adhésif (16) comporte de la matière adhésive sur ses deux faces.Dial according to one of claims 1 to 5, characterized in that the adhesive tape (16) has adhesive material on its two faces. Cadran selon l'une des revendications 1 à 6, caractérisé en ce que l'épaisseur du ruban adhésif (16) est de l'ordre 50 micromètres.Dial according to one of Claims 1 to 6, characterized in that the thickness of the adhesive tape (16) is around 50 micrometers. Procédé de fixation d'éléments décoratifs sur un cadran caractérisé en ce qu'il comprend les étapes consistant à: se munir d'un cadran (1) ou d'une plaque (P) dans laquelle seront découpés une pluralité de cadrans (1); pratiquer dans ledit cadran (1) ou ladite plaque (P), aux endroits destinés à recevoir lesdits éléments décoratifs (8), des ouvertures (12) traversant l'épaisseur dudit cadran (1) ou de ladite plaque (P); appliquer un ruban adhésif (16) sur la face inférieure (4) dudit cadran (1) ou de ladite plaque (P) de sorte que la face du ruban adhésif (16) comportant la matière adhésif est dirigée vers lesdites ouvertures (12), poser lesdits éléments décoratifs (8) dans les ouvertures (12) pour qu'ils viennent se coller par une de leurs faces sur la face adhésive du ruban adhésif (16). Method of fixing decorative elements to a dial, characterized in that it comprises the steps consisting in: have a dial (1) or a plate (P) from which a plurality of dials (1) will be cut; making in said dial (1) or said plate (P), at the places intended to receive said decorative elements (8), openings (12) passing through the thickness of said dial (1) or of said plate (P); applying an adhesive tape (16) to the underside (4) of said dial (1) or of said plate (P) so that the face of the adhesive tape (16) comprising the adhesive material is directed towards said openings (12), placing said decorative elements (8) in the openings (12) so that they come to stick by one of their faces on the adhesive face of the adhesive tape (16). Procédé de fixation selon la revendication 8, caractérisé en ce que les ouvertures (12) sont formées par étampage.Fastening method according to claim 8, characterized in that the openings (12) are formed by stamping. Procédé de fixation selon la revendication 8 ou 9 caractérisé en ce qu'il comprend préalablement à l'étape d'application du ruban adhésif une étape d'étampe du ruban adhésif pour lui conférer une forme correspondante à celle du cadran à l'exception desdites ouvertures.Fastening method according to claim 8 or 9 characterized in that it includes, prior to the step of applying the adhesive tape, step of stamping the adhesive tape to give it a corresponding shape to that of the dial with the exception of said openings.
EP99104416A 1999-03-05 1999-03-05 Dial comprising brilliants, applied ornaments or other attached elements and process for fixing such elements onto such a dial Expired - Lifetime EP1035453B1 (en)

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CH41499 1999-03-05

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EP (1) EP1035453B1 (en)
JP (1) JP2000275359A (en)
KR (1) KR20000071405A (en)
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DE (1) DE69917744T2 (en)
HK (1) HK1030269A1 (en)
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US6404704B1 (en) 2002-06-11
KR20000071405A (en) 2000-11-25
DE69917744D1 (en) 2004-07-08
HK1030269A1 (en) 2001-04-27
EP1035453B1 (en) 2004-06-02
TW413742B (en) 2000-12-01
CN1289985C (en) 2006-12-13
JP2000275359A (en) 2000-10-06
CN1267005A (en) 2000-09-20
DE69917744T2 (en) 2005-07-07

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