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EP1538492A1 - Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür - Google Patents

Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür Download PDF

Info

Publication number
EP1538492A1
EP1538492A1 EP03027684A EP03027684A EP1538492A1 EP 1538492 A1 EP1538492 A1 EP 1538492A1 EP 03027684 A EP03027684 A EP 03027684A EP 03027684 A EP03027684 A EP 03027684A EP 1538492 A1 EP1538492 A1 EP 1538492A1
Authority
EP
European Patent Office
Prior art keywords
feet
dial
substrate
enamelled
enamel
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
EP03027684A
Other languages
English (en)
French (fr)
Other versions
EP1538492B1 (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 CH02059/03A priority Critical patent/CH697052A5/fr
Priority to DE60321186T priority patent/DE60321186D1/de
Priority to EP03027684A priority patent/EP1538492B1/de
Publication of EP1538492A1 publication Critical patent/EP1538492A1/de
Priority to HK05111120.5A priority patent/HK1079297A1/xx
Application granted granted Critical
Publication of EP1538492B1 publication Critical patent/EP1538492B1/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
    • 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 present invention relates to an enamelled dial with feet, in particular a enamelled dial for timepiece.
  • the invention also relates to a method to make such a dial, and to fix the feet with a precision not requesting no retouching for subsequent positioning in dwellings provided in the plate.
  • the enameling of the visible face of the dial was useful, especially to hide a substrate generally made of copper, or copper alloy for aesthetic purposes.
  • the face back of the dial is provided with feet to ensure correct positioning of the dial.
  • said rear face of the dial has a counter-enamelling, even coarse, to compensate for the tensions resulting from enamelling of the visible side.
  • the traditional manufacturing process involves a very large number of steps requiring from the manufacturer a great know-how which does not prevent not in spite of that to have a significant percentage of rejects, as we will understand it below.
  • a first step cutting into a thin copper plate, or copper alloys (0.1 mm for a wristwatch, up to 0.4 mm for a pendulum), a template a little larger than the shape of the dial, holes are drilled for the feet of copper dial, then the riveting / welding of the feet is done.
  • no openings, such as needles or wickets, are made in the base plate, on the one hand not to weaken it, on the other hand to avoid the well formation during enameling.
  • a enamel composition on both sides of the plate by known methods, such as soaking, screen printing or sieving. In the latter case, the face lower is previously coated with glue.
  • the dial thus prepared is then baked at a temperature between 750 ° C and 850 ° C depending on the composition enamel. The bending and the lower enamel layer make it possible to control deformations of the dial, due to the difference between the coefficient of expansion of copper and that of enamel, at the end of manufacture.
  • this second step is renewed several times time, ie between 2 to 5 times, until the enamel layer has a thickness about 0.7 mm, the thickness needed to mask the appearance as little as possible aesthetics of the copper substrate and to give the dial the mechanical properties desired.
  • a surface condition check is performed to eliminate the unwanted inclusions and to fill the pores, and the dial is again subject to a heat treatment.
  • the third step consists of tracing the dial indexes, applying a film varnish or enamel very thin with a passage in the oven, then to make a pressing to a temperature determined 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 upgraded, but retains a granular and porous appearance.
  • the feet which may have been distorted during previous manipulations and heat treatments, are first cleared by image of the enamel film that can cover them, then straightened so that they coincide perfectly with the housing provided in the plate. During this stage, Risks of damaging an almost finished product are great. Indeed, the recovery feet can cause either breakage or cracks in the enamel layer, even its partial detachment.
  • the present invention therefore aims at overcoming the drawbacks of this prior art, by providing a method of manufacturing an enamelled dial with feet having a 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 invention relates to an enamelled dial with feet of positioning in the turntable of a watch movement, said dial being formed from a ceramic substrate whose outer surface is coated with one to two layers of enamel and whose internal surface, on the movement side, comprises a film of attachment allowing the deposit of a thicker metal layer allowing to fix with high accuracy the head of the feet by gluing, welding or brazing.
  • This deposit can be performed, for example by galvanic growth. Setting up feet intervening in the very last stage of manufacture, they did not undergo the constraints thermal, nor manipulations due to enamelling, which avoids their repositioning later when mounting on the movement.
  • the ceramic substrate has a light hue, the small number of layers of enamel is enough to have, with a thickness of between 0.1 mm and 0.4 mm, a very satisfactory surface state and conversely allows to have a substrate thicker.
  • the thickness of the ceramic substrate is preferably between 0.4 mm, which is a value already allowing to have satisfactory mechanical properties, and 0.9 mm.
  • the finished dial is therefore substantially the same thickness as the dials of the prior art, but with an inversion of substrate / layer thickness ratios enamel.
  • the thermal conduction can be estimated to be about 1/50 of that that we would observe with a thin copper substrate. Under these conditions, it is possible to fix the feet with heat input (welding or brazing) in a final step, without risk of damaging the enamel on the surface of the dial, which would not be the case with a copper substrate.
  • a housing for the head said housing being designed during pressing, or subsequently produced by machining.
  • Figure 1A shows the first step of the process of coating a ceramic substrate 1 having a thickness of between 0.4 mm and 0.9 mm, preferably 0.7 mm, one or two layers of enamel having in all a thickness between 0.1 and 0.4 mm, that is to say having a substrate whose thickness is at less than twice that of the enamel layer. This small number of layers Enamel is quite sufficient, given the clear appearance of the ceramic substrate.
  • the substrate 1 is obtained by pressing or by the CIM process (Ceramic Injection Molting) well known, from a ceramic powder such as aluminum oxide or of zirconium.
  • CIM process Ceramic Injection Molting
  • the control of this process is currently sufficient to produce parts with a very tight tolerance that does not require any further editing, especially as the very small number of enamel layers does not produce edge effects.
  • edge effect although not shown in FIG. 1A, it is also possible to start from a substrate 1 comprising axis passages needles and possibly wickets, or to form them by machining before enameling.
  • the ceramic plate forming the substrate 1 is in fact sufficiently rigid to not be weakened by through passages. In this step, we perform also the decal of the hourly indexes or other signs, then the icing (no represent).
  • the second step concerns the treatment of the face bottom of the dial allowing the fixing of the dial foot by gluing, welding, or brazing.
  • the third step consists in coming to fix on the thick layer 7, the head 11 of the foot 9, by gluing, welding or soldering, in the precise position that it must occupy for mounting the dial on the plate, that is to say without having to exert mechanical constraints on it to reposition it.
  • the foot 9 and its head 11 is made from a copper rod, or even gold alloy if the thick layer 7 junction is also gold.
  • FIG. 2 a dial according to FIG. the invention obtained according to a second embodiment. It differs from the first mode of realization that has just been described in that the positioning of the foot 9 is obtained from even more precise thanks to a cylindrical housing 13 provided during manufacture of the ceramic substrate 1 or by subsequent machining. Other treatments of the face bottom of the dial and the foot fastening means are otherwise identical.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Insulated Metal Substrates For Printed Circuits (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Glass Compositions (AREA)
EP03027684A 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür Expired - Lifetime EP1538492B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CH02059/03A CH697052A5 (fr) 2003-12-03 2003-12-03 Cadran émaillé avec pieds et son procédé de fabrication.
DE60321186T DE60321186D1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür
EP03027684A EP1538492B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür
HK05111120.5A HK1079297A1 (en) 2003-12-03 2005-12-06 Enamelled watch face with feet and its fabrication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03027684A EP1538492B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür

Publications (2)

Publication Number Publication Date
EP1538492A1 true EP1538492A1 (de) 2005-06-08
EP1538492B1 EP1538492B1 (de) 2008-05-21

Family

ID=34442938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03027684A Expired - Lifetime EP1538492B1 (de) 2003-12-03 2003-12-03 Emailliertes Zifferblatt mit Füsse und sein Herstellungsverfahren dafür

Country Status (4)

Country Link
EP (1) EP1538492B1 (de)
CH (1) CH697052A5 (de)
DE (1) DE60321186D1 (de)
HK (1) HK1079297A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103576530A (zh) * 2012-07-19 2014-02-12 王辉 陶瓷表
CN107329390A (zh) * 2017-07-27 2017-11-07 广州番禺职业技术学院 一种高温珐琅表盘及其制作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3835880B1 (de) * 2019-12-10 2022-08-10 Comadur S.A. Uhrzifferblatt mit füsschen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803832A (en) * 1972-02-01 1974-04-16 N Shimizu Dial for wrist watch and a method of making the same
GB2052113A (en) * 1979-06-29 1981-01-21 Citizen Watch Co Ltd A structure for a timepiece and a method of manufacturing the structure
JPS61202184A (ja) * 1985-03-05 1986-09-06 Citizen Watch Co Ltd 時計用文字板
GB2207092A (en) * 1987-06-24 1989-01-25 Totceramica Maquinaria Machine for printing ceramic pieces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803832A (en) * 1972-02-01 1974-04-16 N Shimizu Dial for wrist watch and a method of making the same
GB2052113A (en) * 1979-06-29 1981-01-21 Citizen Watch Co Ltd A structure for a timepiece and a method of manufacturing the structure
JPS61202184A (ja) * 1985-03-05 1986-09-06 Citizen Watch Co Ltd 時計用文字板
GB2207092A (en) * 1987-06-24 1989-01-25 Totceramica Maquinaria Machine for printing ceramic pieces

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0110, no. 32 (P - 541) 30 January 1987 (1987-01-30) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103576530A (zh) * 2012-07-19 2014-02-12 王辉 陶瓷表
CN107329390A (zh) * 2017-07-27 2017-11-07 广州番禺职业技术学院 一种高温珐琅表盘及其制作方法

Also Published As

Publication number Publication date
EP1538492B1 (de) 2008-05-21
DE60321186D1 (de) 2008-07-03
HK1079297A1 (en) 2006-03-31
CH697052A5 (fr) 2008-03-31

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