EP2228694A1 - Dispositif et procédé de ponçage de verres de montres - Google Patents

Dispositif et procédé de ponçage de verres de montres Download PDF

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Publication number
EP2228694A1
EP2228694A1 EP09155030A EP09155030A EP2228694A1 EP 2228694 A1 EP2228694 A1 EP 2228694A1 EP 09155030 A EP09155030 A EP 09155030A EP 09155030 A EP09155030 A EP 09155030A EP 2228694 A1 EP2228694 A1 EP 2228694A1
Authority
EP
European Patent Office
Prior art keywords
drum
curvature
grinding
glasses
grinding wheel
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.)
Withdrawn
Application number
EP09155030A
Other languages
German (de)
English (en)
Inventor
Hansruedi Sägesser
Erwin Ramseyer
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.)
Stettler Sapphire AG
Original Assignee
Stettler Sapphire 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 Stettler Sapphire AG filed Critical Stettler Sapphire AG
Priority to EP09155030A priority Critical patent/EP2228694A1/fr
Priority to PCT/EP2010/052452 priority patent/WO2010102909A1/fr
Publication of EP2228694A1 publication Critical patent/EP2228694A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a method for grinding watch glasses, in particular those made of sapphire, in which the watch glasses a first curvature with a first radius of curvature and a perpendicular extending second curvature is sanded with a second radius of curvature, with several to be ground watch glasses on the circumference of a rotatable Drum are arranged and acted upon by at least one rotatable grinding wheel.
  • the watch glasses to which the invention relates are in their simplest form one-sided, i. just on the top, cambered.
  • the present invention relates to an apparatus for carrying out the inventive method.
  • Such glasses serve as coverslips and give the watches a special aesthetic touch.
  • EP-B1-0948758 a rectangular in plan view clock glass whose lower surface is flat and the upper surface is crowned in the manner of a Torussegments.
  • the upper surface of the watch glass has two different radii of its convex curvature, wherein the larger radius of curvature, ie the lower curvature, corresponds to the longitudinal axis of the rectangle.
  • This particular design of the watch glass results in a watch glass that is thicker in the center than at the edge and has a more uniform thickness at the edge than other watch glasses that have a cylindrical or spherical curvature of the top surface.
  • This process requires four steps in terms of grinding and still further process steps to secure the jars and adjust the grinding radii. Therefore, the process is delicate and very expensive.
  • EP-B1-0948758 discloses a method for producing the described watch glass, which is carried out by means of a device which consists essentially of a drum rotatably driven about a first axis and arranged in extension of the drum and rotationally driven about a second axis grinding body.
  • the grinding wheel is located on a carriage, which is pivotable about a third axis perpendicular to the first axis.
  • the drum is provided for receiving the watch glasses to be ground, for example with the long side in the circumferential direction of the drum, and flattened at the attachment points of the glasses.
  • the drum rotates with the glasses in front of a rotating grinding wheel and the glasses get their curvature in accordance with the drum radius (and additionally the glass thickness).
  • the grinding wheel can also exert a lateral pivoting movement to both sides of the glasses and thereby generates the curvature of the narrow sides of the rectangular glass.
  • the invention has for its object to provide a substantially improved and simplified method that can be carried out by simple means and supplies exactly ground glasses in less time and at a lower cost.
  • the two different curvatures of the glasses are produced simultaneously, wherein there is a flat contact between the grinding tool and the glasses moving in front of it or is generated in a short time after the beginning of the grinding process. This procedure contributes significantly to the faster execution of the method.
  • an acute angle can be provided between the axes of the two active elements, namely, the glass occupied with the disc and the grinding wheel. This results in domed watch glasses whose lateral edges have different thicknesses.
  • the inventive method is not limited to elongated glasses; It can be ground with the same success and round glasses. It may be advisable to mark the direction of the curvature beforehand on the glass.
  • watch glasses made of any materials can be processed, for example glass, hard materials such as sapphire, rock crystal and other transparent semi-precious stones, plastics such as Plexiglas® and other transparent materials. It is of course to choose the appropriate abrasive, which is natural for the expert.
  • polishing as used in this document also includes the polishing of the processed glasses.
  • the inventive method allows a fast grinding of the watch glasses using a particularly simple device. Even if it is desired to grind with serially different radii of curvature, this condition can be met by rapid replacement of the drum and / or grinding wheel. Finally, it is still possible to easily produce asymmetric crowns by shaping the peripheral surface of the grinding wheel accordingly.
  • a motor 12 is mounted on the axis 14, a grinding wheel 16 is attached.
  • a drum 18 is rotatably arranged, which has the shape of a cylindrical disc, on the peripheral surface 20, a number of watch glasses 22 are glued.
  • the glasses 22 are drawn here round; but it can also be provided glasses of another shape, for example, oval or rectangular or square.
  • the drive mechanism of the drum 18 is not shown in the drawing (this applies to all figures).
  • the motor 12 rests on the base 10 via a displaceable base plate 24, it can be approximated to the glasses 22 in the direction of the arrow V and be removed in the opposite direction.
  • the configuration of the grinding wheel 16 is better Fig. 2 out.
  • the pressed abrasive grains 30 forming the abrasive article are enclosed between the cover plates 28.
  • the abrasive body extends circumferentially beyond the shrouds 28, and the peripheral surface 26 is not flat, as in the known grinding wheels, but it is concavely curved, wherein the radius of curvature is denoted by R1.
  • the individual glasses to be ground 22 On the outer circumferential surface of the drum 18 are the individual glasses to be ground 22. Their distance from the central axis A of the drum 18 is denoted by R2. In operation, the drum 18 is rotated, and the grinding wheel 16 is also rotated and approached to the drum 18 in the direction of arrow V.
  • the second embodiment of the inventive device is in the Fig. 3 and 4 shown, wherein for elements which are those in the Fig. 1 and 2 correspond, the same reference numerals are used.
  • the device after Fig. 3 and 4 serves to produce concave ground glasses.
  • the drum 28 is formed as a hollow cylinder, and to be ground glasses 22 are on a cylindrical inner surface 20 '(FIG. Fig. 4 ) of the drum 28, which is located at a distance from R2 to the drum axis A.
  • the outer circumference 26 of the grinding wheel 16, ie of the grinding body 30, is curved convexly with a radius of curvature R1 which corresponds to the desired concave curvature of the glasses 22.
  • the grinding wheel 16 and the drum 18 are rotated, and the rotating grinding wheel 16 is approached to the glasses 22 in the direction of the arrow V.
  • FIG. 5 shows a perspective view of this device at rest and in Fig. 6 in working position.
  • Fig. 7 is a longitudinal section in the plane shown by the line VII-VII in FIG Fig. 6 is defined. Also in these figures, the same reference numerals are used for the same or similar elements as in the preceding figures, optionally provided with an apostrophe.
  • the drum 18, to which the individual glasses 22 to be ground are fastened, is as in the second embodiment ( Fig. 3 and 4 ) formed as a hollow cylinder, and when grinding the glasses, a concave toric cut is produced.
  • the two grinding groups 12-24-38-16 and 12'-24'-38'-16 'in the direction of the arrows P, P' are removed from each other, finally results in the Fig. 6 shown arrangement.
  • the grinding wheels 16, 16 ' are in sliding contact with the glasses 22, and the processing according to the method proceeds.
  • the motors 12, 12 'on the one hand and the drum 18 on the other hand are in rotation at a rotational speed adapted to the grinding work.
  • Fig. 7 is a section in the plane VII-VII of Fig. 6 shown.
  • the concave cut produced by the grinding groups 12-24-38-16 and 12'-24'-38'-16 'on the glasses 22 has the two radii of curvature R1 and R2.
  • the apparatus of the third embodiment allows double grinding performance at the same rotational speeds of the grinding wheel and the drum on which the glasses are mounted.
  • concave cuts are formed.
  • the device can be easily modified as shown in FIG Fig. 7 indicated by dashed lines.
  • the glasses 40 are attached to the outside of the drum 18, and the two abrasive groups, one of which is schematically indicated 42 and 44, act on both sides of the outside in the direction of the arrows Z, Z 'on the glasses 40 a.
  • the two abrasive groups one of which is schematically indicated 42 and 44, act on both sides of the outside in the direction of the arrows Z, Z 'on the glasses 40 a.
  • R3 ⁇ R2.
  • the third embodiment of the device according to the invention is more complex than the other two embodiments. Because of the high processing speed, it is particularly suitable for polishing the ground glasses. It is advantageous if the carriage 32 is pivotally mounted about a pivot axis which is perpendicular to the grinding wheel axes and the drum axis and extends through the intersection thereof.
  • the ground watch glasses produced in the method according to the invention using the above-described embodiments of the device have a flat underside. If the underside of the glasses is also to be given a toric finish, the ones ground on one side are in turn fastened to the grinding drum again after they have been removed, and the underside can now be ground.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP09155030A 2009-03-12 2009-03-12 Dispositif et procédé de ponçage de verres de montres Withdrawn EP2228694A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09155030A EP2228694A1 (fr) 2009-03-12 2009-03-12 Dispositif et procédé de ponçage de verres de montres
PCT/EP2010/052452 WO2010102909A1 (fr) 2009-03-12 2010-02-26 Procédé et dispositif pour polir des verres de montre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09155030A EP2228694A1 (fr) 2009-03-12 2009-03-12 Dispositif et procédé de ponçage de verres de montres

Publications (1)

Publication Number Publication Date
EP2228694A1 true EP2228694A1 (fr) 2010-09-15

Family

ID=40846890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09155030A Withdrawn EP2228694A1 (fr) 2009-03-12 2009-03-12 Dispositif et procédé de ponçage de verres de montres

Country Status (2)

Country Link
EP (1) EP2228694A1 (fr)
WO (1) WO2010102909A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500134A1 (fr) * 2011-03-16 2012-09-19 Comadur S.A. Pièce d'habillage pour une pièce d'horlogerie et son système de fabrication
RU2590515C2 (ru) * 2011-03-16 2016-07-10 Комадюр С.А. Система полирования внешних деталей для часовых изделий

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1426146A (en) * 1920-11-12 1922-08-15 Onepiece Bifocal Lens Company Toric-lens series and process of making same
US1503497A (en) * 1922-07-03 1924-08-05 American Optical Corp Lens-grinding machine
GB563067A (en) * 1943-04-14 1944-07-27 Percy Lever Improvements in or relating to grinding and polishing machines
US3348340A (en) * 1964-07-24 1967-10-24 Textron Inc Method and apparatus for manufacturing optical lenses
WO1998015876A1 (fr) * 1996-10-04 1998-04-16 Hans Stettler Ag Glace de montre
EP1645919A1 (fr) * 2004-10-11 2006-04-12 Fuji Crystal Manufactory Ltd. Glace de montre bombée

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1426146A (en) * 1920-11-12 1922-08-15 Onepiece Bifocal Lens Company Toric-lens series and process of making same
US1503497A (en) * 1922-07-03 1924-08-05 American Optical Corp Lens-grinding machine
GB563067A (en) * 1943-04-14 1944-07-27 Percy Lever Improvements in or relating to grinding and polishing machines
US3348340A (en) * 1964-07-24 1967-10-24 Textron Inc Method and apparatus for manufacturing optical lenses
WO1998015876A1 (fr) * 1996-10-04 1998-04-16 Hans Stettler Ag Glace de montre
EP0948758B1 (fr) 1996-10-04 2003-12-10 Hans Stettler AG Glace de montre ainsi que son procede de fabrication
EP1645919A1 (fr) * 2004-10-11 2006-04-12 Fuji Crystal Manufactory Ltd. Glace de montre bombée
EP1645919B1 (fr) 2004-10-11 2007-12-19 Fuji Crystal Manufactory Ltd. Glace de montre bombée

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500134A1 (fr) * 2011-03-16 2012-09-19 Comadur S.A. Pièce d'habillage pour une pièce d'horlogerie et son système de fabrication
WO2012123214A1 (fr) * 2011-03-16 2012-09-20 Comadur S.A. Pièce d'habillage pour une pièce d'horlogerie et son système de fabrication
JP2014512974A (ja) * 2011-03-16 2014-05-29 コマディール・エス アー 時計用外部部品およびその製造システム
US9372474B2 (en) 2011-03-16 2016-06-21 Comadur S.A. External piece for a timepiece and system of manufacturing the same
RU2590466C2 (ru) * 2011-03-16 2016-07-10 Комадюр С.А. Внешняя деталь для часового изделия и система ее изготовления
RU2590515C2 (ru) * 2011-03-16 2016-07-10 Комадюр С.А. Система полирования внешних деталей для часовых изделий
US9914195B2 (en) 2011-03-16 2018-03-13 Comadur S.A. System of polishing external pieces for a timepiece

Also Published As

Publication number Publication date
WO2010102909A1 (fr) 2010-09-16

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