EP1538493B1 - Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür - Google Patents

Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür Download PDF

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Publication number
EP1538493B1
EP1538493B1 EP20030027696 EP03027696A EP1538493B1 EP 1538493 B1 EP1538493 B1 EP 1538493B1 EP 20030027696 EP20030027696 EP 20030027696 EP 03027696 A EP03027696 A EP 03027696A EP 1538493 B1 EP1538493 B1 EP 1538493B1
Authority
EP
European Patent Office
Prior art keywords
ceramic
dial
enamelled
feet
housing
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.)
Expired - Lifetime
Application number
EP20030027696
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English (en)
French (fr)
Other versions
EP1538493A1 (de
Inventor
Steve Bourban
Rudolf Dinger
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.)
Asulab AG
Original Assignee
Asulab AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asulab AG filed Critical Asulab AG
Priority to EP20030027696 priority Critical patent/EP1538493B1/de
Priority to DE60320805T priority patent/DE60320805D1/de
Publication of EP1538493A1 publication Critical patent/EP1538493A1/de
Application granted granted Critical
Publication of EP1538493B1 publication Critical patent/EP1538493B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • G04B19/12—Selection of materials for dials or graduations markings
    • 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
    • G04B19/14—Fastening the dials to the clock or watch plates

Definitions

  • the present invention relates to an enamelled dial with hunted feet, including an enamelled dial for a timepiece.
  • the invention also relates to a method for manufacturing such a dial, and to fix the feet with a precision requiring no retouch for later positioning in the housings provided in the plate.
  • a template slightly larger than the shape of the wrist is cut out.
  • dial drill holes for copper dial feet, then rivet / weld the feet. It will be observed that no opening, such as the passageways of needles or wickets, is made in the base plate, on the one hand not to weaken it, on the other hand to avoid the formation of wells during enameling.
  • a second step after bending, is deposited an enamel composition on both sides of the plate, by known methods, such as soaking, screen printing or sieving. In the latter case, the underside is previously coated with an adhesive.
  • the dial thus prepared is then passed to the oven at a temperature of between 750 ° C. and 850 ° C., depending on the composition of the enamel. The bending and the lower enamel layer make it possible to control the deformations of the dial, due to the difference between the coefficient of expansion of the copper and that of the enamel, at the end of manufacture.
  • this second step is repeated several times, namely between 2 to 5 times, until the enamel layer has a thickness of about 0.7 mm, the thickness necessary to mask the best possible unattractive appearance of the copper substrate and give the dial the desired mechanical properties.
  • a surface condition check is performed to remove unwanted inclusions and to fill the pores, and the dial is again subjected to heat treatment.
  • the third step involves tracing the dial indexes, applying a film of enamel or very fine enamel with a passage in the oven, and then pressing at a certain temperature to give the dial the optimum flatness.
  • the fourth step is to retouch on the back of the dial.
  • the "technical" enamel layer is roughly leveled, but retains a granular and porous appearance.
  • the feet which may have undergone distortions during previous handling and thermal treatments, are first removed by filing the enamel film which can cover them and then straightened so that they coincide perfectly with the housings provided in the plate. .
  • the risks of damaging an almost finished product are great. Indeed, the straightening of the feet can cause either their breakage, or cracks in the enamel layer, or even its partial detachment.
  • the present invention therefore aims to overcome the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet removed with fewer steps and does not require the repositioning of the feet at the end of manufacture, nor a grinding for the setting of the dial.
  • the subject of the invention is an enamelled dial, according to claim 1, and its manufacturing method according to claim 7, with feet driven from positioning in the plate of a watch movement, said dial being formed by a first ceramic element, whose outer surface is coated with one to two layers of enamel and a second element provided with a housing for the precise placement of a foot by driving and / or gluing before assembly of the two elements by gluing and / or welding.
  • This second element oriented movement side can be made of ceramic as the first element and have the same dimensions than this one. It can also be made of metal with the same contour as the first element, but with a smaller thickness, or in the form of a block that fits into a housing formed in the first ceramic element.
  • the small number of enamel layers is sufficient to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and allows inversely to have a thicker substrate.
  • the thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.7 mm, according to the embodiment.
  • the finished dial is therefore substantially the same thickness as the dials of the prior art, but with a reversal of substrate thickness ratios / enamel layer.
  • a dial according to the invention basically consists of three elements.
  • An upper ceramic element 1a having a thickness of about 0.4 mm, is coated with one or two layers of enamel whose total thickness is between 0.1 mm and 0.4 mm. This small number of layers is quite sufficient, given the clear appearance of the ceramic on which the enamel layers are applied.
  • a decal for the hour markers or other signs is also applied to the enamelled surface, followed by glazing.
  • a lower element 1b also in ceramic approximately 0.4 mm thick, is provided with a bore 2 intended to receive a cylindrical foot 9 secured by gluing and / or driving before assembling the lower elements 1b and upper 1a by means of an adhesive joint 4 and / or a peripheral weld 6, for example by laser or electron bombardment.
  • the two ceramic elements 1a, 1b are obtained from a ceramic powder such as an oxide of aluminum or zirconium, by pressing or by the well-known CIM (Ceramic Injection Molting) process.
  • CIM Chemical Injection Molting
  • the control of this process is currently sufficient to produce parts with a very tight tolerance requiring no further editing, especially since the very small number of enamel layers does not produce edge effects.
  • the assembly of the elements 1a and 1b is preferably carried out by peripheral welding.
  • the figure 3 corresponds to a second embodiment in which the dial foot is still fixed by driving.
  • the dial comprises an upper element 1a made of ceramic having a thickness of between 0.4 and 0.7 mm, said element being as previously covered with one to two enamel layers 3.
  • the lower element 8 is formed of a metal plate, for example copper or a gold alloy, with a thickness of between 0.1 and 0.3 mm.
  • This lower element 8 has holes 2 at the precise locations where the feet 9 must be fixed by driving and / or gluing before assembly of the upper elements 1a and lower 8 by means of an adhesive joint 4.
  • This embodiment also allows to have a rear face of the very aesthetic dial by choosing the same metal for the lower element 8 and for the foot 9, for example a gold alloy.
  • the figure 4 represents a third embodiment, which is in fact a variant of the previous embodiment.
  • the metal plate constituting the lower element 8 is replaced by a metal block 10 in which the foot 9 is driven / glued, said block 10 being positioned in a housing 13 formed in the upper element 1, or when the manufacture of said element by pressing or by the CIM process, or later by machining.

Claims (10)

  1. Emailliertes Zifferblatt mit Positionierfüssen (9), welches aus einem mit einem zweiten Element (1 b, 8, 10) verbundenen ersten Element (1 a) aus Keramik besteht, wobei an dem zweiten Element (1 b, 8, 10) wenigstens ein Fuss (9) angebracht ist, dadurch gekennzeichnet, dass die äussere Oberfläche des ersten Elements (1a) mit ein bis zwei Emailschichten überzogen ist, und dass das zweite Element (1 b, 8, 10) mit wenigstens einer Aufnahme (2) versehen ist, die es erlaubt, einen Fuss (9) vor der Befestigung des ersten und des zweiten Elementes aneinander mit einer Kleb- oder Schweiss- bzw. Lötverbindung (4) durch einsetzen und/oder kleben zu befestigen.
  2. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass das zweite Element (1 b) ebenfalls aus Keramik ausgebildet ist, und im Wesentlichen die gleichen Abmessungen und die gleiche Dicke wie das erste Element (1a) besitzt.
  3. Emailliertes Zifferblatt nach Anspruch 2, dadurch gekennzeichnet, dass die keramischen Elemente (1 b, 8, 10) eine Dicke von 0,4 bis 0,5 mm besitzen.
  4. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass das zweite Element (8) von einer Metallplatte gebildet ist, deren Dicke unter der des ersten Elements (1a) aus Keramik liegt, und die die gleichen Abmessungen wie das erste Element (1 a) besitzt.
  5. Emailliertes Zifferblatt nach Anspruch 1, dadurch gekennzeichnet, dass das zweite Element (10) von einem Metallblock gebildet ist, der in eine in dem ersten Elements (1 a) gebildete Aufnahme (12) eingesetzt oder geklebt ist.
  6. Emailliertes Zifferblatt nach Anspruch 2 oder 4, dadurch gekennzeichnet, dass das erste Element (10) aus Keramik ferner vor der Emaillierung Durchgänge für Lager von Zeigern und eventuell Fensterchen gegenüber von entsprechenden Durchgängen in dem zweiten Element (1 b, 8) aufweist.
  7. Verfahren zum Herstellen eines emaillierten Zifferblattes mit eingesetzten Füssen, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    - bilden eines ersten Substrates (1 a) aus Keramik mit genau den für das Ziffernblatt gewünschten Abmessungen,
    - aufbringen von ein bis zwei Emailschichten (3) auf der äusseren Seite des ersten Substrates (1a),
    - bilden eines zweiten Elementes (1b, 8, 10), welches eine Aufnahme umfasst, in der ein Fuss (9) des Zifferblattes eingesetzt oder geklebt ist,
    - verbinden des ersten (1a) und des zweiten (1b, 8, 10) Elementes miteinander durch kleben und/oder schweissen bzw. löten.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das zweite Element (1 b) ebenfalls aus Keramik ausgebildet ist, und im Wesentlichen die gleichen Abmessungen und die gleiche Dicke wie das erste Element (1a) besitzt.
  9. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das zweite Element (8) von einer Metallplatte gebildet ist, deren Dicke unter der des ersten Elements (1a) aus Keramik liegt, und die die gleichen Abmessungen wie das erste Element (1a) besitzt.
  10. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das zweite Element (10) von einem Metallblock gebildet ist, der in eine in dem ersten Element (1a) gebildete Aufnahme (12) eingesetzt oder geklebt ist.
EP20030027696 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür Expired - Lifetime EP1538493B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20030027696 EP1538493B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür
DE60320805T DE60320805D1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030027696 EP1538493B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür

Publications (2)

Publication Number Publication Date
EP1538493A1 EP1538493A1 (de) 2005-06-08
EP1538493B1 true EP1538493B1 (de) 2008-05-07

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EP20030027696 Expired - Lifetime EP1538493B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit eingeschlagenen Füssen und Herstellungsverfahren dafür

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EP (1) EP1538493B1 (de)
DE (1) DE60320805D1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1640822B1 (de) * 2004-09-22 2012-08-01 Asulab S.A. Multi-Etage-Zifferblatt
EP2400354A1 (de) * 2010-06-22 2011-12-28 The Swatch Group Research and Development Ltd. Zifferblattfuß einer Uhr
EP2503414A1 (de) * 2011-03-23 2012-09-26 Rubattel et Weyermann S.A. Decorated enamelled part
CN103576530A (zh) * 2012-07-19 2014-02-12 王辉 陶瓷表
EP3835880B1 (de) 2019-12-10 2022-08-10 Comadur S.A. Uhrzifferblatt mit füsschen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH352962A (de) * 1957-03-22 1961-03-15 Bloesch Walter Verfahren zur Herstellung eines Zifferblattes und nach diesem Verfahren hergestelltes Zifferblatt
JPS4881565A (de) * 1972-02-01 1973-10-31
JPS569074U (de) * 1979-06-29 1981-01-26
JPS5881977A (ja) * 1981-11-09 1983-05-17 Toru Mashida 装飾基体の製造方法

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EP1538493A1 (de) 2005-06-08
DE60320805D1 (de) 2008-06-19

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