EP1645919B1 - Glace de montre bombée - Google Patents

Glace de montre bombée Download PDF

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Publication number
EP1645919B1
EP1645919B1 EP20040405636 EP04405636A EP1645919B1 EP 1645919 B1 EP1645919 B1 EP 1645919B1 EP 20040405636 EP20040405636 EP 20040405636 EP 04405636 A EP04405636 A EP 04405636A EP 1645919 B1 EP1645919 B1 EP 1645919B1
Authority
EP
European Patent Office
Prior art keywords
radius
face
curvature
clock
along
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.)
Not-in-force
Application number
EP20040405636
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1645919A1 (fr
Inventor
Kin Man Unit A & B 38F. Tower 18 Yeung
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.)
Fuji Crystal Manufactory Ltd
Original Assignee
Fuji Crystal Manufactory Ltd
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 Fuji Crystal Manufactory Ltd filed Critical Fuji Crystal Manufactory Ltd
Priority to EP20040405636 priority Critical patent/EP1645919B1/fr
Publication of EP1645919A1 publication Critical patent/EP1645919A1/fr
Priority to HK06110238A priority patent/HK1089822A1/xx
Application granted granted Critical
Publication of EP1645919B1 publication Critical patent/EP1645919B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • G04D3/06—Devices for shaping or setting watch glasses
    • G04D3/065—Shaping by removing material, e.g. cutting out from a plate, milling the edges
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/004—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass
    • G04B39/006—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass out of wear resistant material, e.g. sapphire

Definitions

  • the present invention relates to the field of watchmaking. It relates, more particularly, a method of machining curved watch windows.
  • This type of ice is used to give a particular stamp to a watch.
  • the document EP 948 758 discloses such an elongated ice, the lower face of which is planar and whose domed upper surface matches a torus segment, that is to say that it has two radii of curvature, the largest of which corresponds to the face the longest.
  • This original characteristic makes it possible to obtain an edge whose thickness is substantially smaller and more constant than in the case of windows whose convex face is cylindrical or spherical, for the same thickness of material in the center.
  • the document GB 371 451 describes a watch glass whose two faces have a double bending but they are synthetic resin and produced by deformation under the effect of temperature and pressure. The technique can not be applied to mineral ice.
  • the object of the present invention is to provide an ice-cream made of transparent mineral material whose two faces have a double bending as described above.
  • the watch glass shown in Figure 1a is barrel-shaped. Its side faces corresponding to 12 and 6 hours are flat, while its side faces corresponding to 3 and 9 hours are curved.
  • the ice of Figure 1b also barrel-shaped, differs from that of Figure 1a only in that its faces 12 and 6 o'clock are curved.
  • the convex upper face 10 is in the form of a torus segment, that is to say that it has, along the axis 12 o'clock-6 o'clock AA, a first radius of curvature RS1 and, along the axis 3 hours-9 hours BB, a second radius of curvature RS2.
  • the concave underside 12 On its side, the concave underside 12 also has the shape of a torus segment, that is to say that it has, along the axis 12 o'clock-6 o'clock AA, a first radius of curvature RI1 and along the axis 3 hours-9 hours BB, a second radius of curvature RI2.
  • the starting point for producing such a mirror is a transparent plate of elongated shape, which can be rectangular, barrel, oval or any other desired shape, and whose main faces are flat and parallel.
  • the wafer is a hard transparent crystalline mineral material, such as sapphire, spinel or ruby.
  • FIGS. 3a-3b schematically illustrate the equipment used to produce the convex upper face 10 respectively in the case of multi-piece machining and in the case of piece-to-piece machining.
  • a grinding machine comprising a rotary drum 14 on the periphery of which are fixed several plates 16 and whose radius Ra is determined by the thickness of the ice and its desired radius of curvature RS1 or RS2.
  • a circular grinding wheel 18 is brought by a carriage (not shown) in contact with the plates so as to progressively round their upper face 10 until the radius of curvature RS1 or RS2 is reached.
  • the process requires two steps using two drums 14 of different diameters.
  • the plates 16 are first oriented on the first drum so as to achieve the radius of curvature RS1 along the axis 12 hours-6 hours. They are then oriented on the second drum so as to achieve the radius curvature RS2 along the axis 3 hours-9 hours.
  • An annular grinding wheel 20 is used whose inner radius Rb is equal to the desired radius RS1 or RS2.
  • the plate 16 is fixed on a support 22 which, with the aid of a carriage (not shown), brings it into contact with the inner face of the grinding wheel so as to progressively round off its upper surface 10 until the radius of curvature RS1 or RS2 is reached.
  • the process also requires two steps using two wheels 20 of different radii.
  • the plates 16 are first oriented on the first grinding wheel to achieve the curvature radius RS1 along the axis 12 hours-6 hours. They are then oriented on the second grinding wheel to achieve the curvature radius RS2 along the axis 3 hours-9 hours.
  • FIGS. 4a-4b schematically illustrate the equipment used to then make the concave lower face 12 respectively in the case of multi-piece machining and in the case of piece-to-piece machining.
  • the plates 16 are fixed, by their convex upper face 10 already machined, on the inner wall of an annular drum 24 whose radius Rc is that of this face, RS1 or RS2.
  • a circular grinding wheel 26 is brought by a carriage (not shown) in contact with the plates so as to gradually round their lower face 12 until the radius of curvature RI1 or RI2 is reached.
  • the process always requires two steps using two drums 24 of different diameters.
  • the plates 16 are first oriented on the first drum to achieve the curvature radius RI1 along the axis 12 hours to 6 hours. They are then oriented on the second drum to achieve the curvature radius RI2 along the axis 3 hours-9 hours.
  • a circular grinding wheel 28 is used whose radius Rd is that of the desired concave lower face 12, either RI1 or RI2.
  • the plate 16 is fixed, by its convex face 10 already machined, on a support 30 which, with the aid of a carriage (not shown), brings it into contact with the grinding wheel so as to round its lower face 12 until the radius of curvature RI1 or RI2 is reached.
  • the process also requires two steps using two wheels 28 of different radii.
  • the wafer 16 is first oriented on the first grinding wheel to achieve the radius curvature RI1 along the 12 o'clock-6 o'clock axis. It is then oriented on the second grinding wheel to achieve the curvature radius RI2 along the axis 3 hours-9 hours.
  • the machining operation is performed using numerically controlled (CNC) installations. It is always followed, of course, an ice polishing operation, performed in a similar manner, the grinding tools being replaced by polishing tools, as known to those skilled in the art.
  • CNC numerically controlled
  • the ice according to the invention can not only have any desired aesthetic effect, but it also offers, between it and the dial of the watch, a space for housing the needles.
  • the aesthetic effect provided by the bending is thus reinforced by the fact that the watch can therefore be substantially thinner.
  • this double bending of the ice makes it possible to avoid a magnifying effect, which is not very desirable.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP20040405636 2004-10-11 2004-10-11 Glace de montre bombée Not-in-force EP1645919B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20040405636 EP1645919B1 (fr) 2004-10-11 2004-10-11 Glace de montre bombée
HK06110238A HK1089822A1 (en) 2004-10-11 2006-09-15 Cambered watch crystal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20040405636 EP1645919B1 (fr) 2004-10-11 2004-10-11 Glace de montre bombée

Publications (2)

Publication Number Publication Date
EP1645919A1 EP1645919A1 (fr) 2006-04-12
EP1645919B1 true EP1645919B1 (fr) 2007-12-19

Family

ID=34932314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040405636 Not-in-force EP1645919B1 (fr) 2004-10-11 2004-10-11 Glace de montre bombée

Country Status (2)

Country Link
EP (1) EP1645919B1 (xx)
HK (1) HK1089822A1 (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2228694A1 (de) 2009-03-12 2010-09-15 Stettler Sapphire AG Verfahren und Vorrichtung zum Schleifen von Uhrengläsern

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101488006B (zh) * 2008-05-13 2012-07-11 张和国 一种呈四面拱状玻璃的制备方法和应用
EP2500135A1 (fr) * 2011-03-16 2012-09-19 Comadur S.A. Système de polissage d'une pièce d'habillage pour une pièce d'horlogerie
CH708661A1 (fr) * 2013-10-04 2015-04-15 Cartier Création Studio Sa Système profilaire à géométrie alternée pour pièce d'horlogerie.
EP3971253A1 (fr) * 2020-09-18 2022-03-23 Precitrame Machines SA Procede d'usinage d'une piece mecanique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH38606A (fr) * 1906-12-26 1907-11-15 E Jornod Machine è travailler les verres de montres
GB371451A (en) * 1930-01-24 1932-04-25 Bakelite Corp Improvements in or relating to watch glasses
GB365499A (en) * 1930-10-29 1932-01-21 Ernest Morf Manufacturing process for watch glasses made of transparent elastic material
US2228670A (en) * 1939-01-14 1941-01-14 Walter L Mulerone Bezel construction for timepieces and the like
CH220796A (fr) * 1941-02-21 1942-04-30 Schmitz Werner Montre de forme à boîte étanche.
CH678254B5 (xx) * 1990-02-16 1992-02-28 Rado Montres Sa
CH690873A5 (fr) * 1996-10-04 2001-02-15 Stettler Hans Ag Glace de montre.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2228694A1 (de) 2009-03-12 2010-09-15 Stettler Sapphire AG Verfahren und Vorrichtung zum Schleifen von Uhrengläsern
WO2010102909A1 (de) 2009-03-12 2010-09-16 Stettler Sapphire Ag Verfahren und vorrichtung zum schleifen von uhrengläsern

Also Published As

Publication number Publication date
HK1089822A1 (en) 2006-12-08
EP1645919A1 (fr) 2006-04-12

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