Method for cutting watch crystals
AssigneeThe Swatch Group Research and Development Ltd
InventorsJean-Luc BAZIN, Martin Gunn-Sechehaye
Life of this patent
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Abstract
Method for cutting a watch crystal along a contour in a plate of transparent material, with the following steps: making, on a first side of the plate, a first cut line or kerf to form a first chamfer, for each crystal of the plate; turning the plate over and marking the position of the first chamfers or of a previously made machined marking; making, on a second side, a second cut line or kerf to form a second chamfer, for each crystal; separating the crystals by machining through the plate at each contour to form an edge of the crystal.
Claims13
A method for cutting a watch crystal along a contour in a plate of transparent material, wherein the following steps are performed in succession and in the following order:
- first step:
- realizing, on a first side of said plate, a first cut line or kerf on at least the inside of said contour, to form a first chamfer, for each of said crystals to be made from said plate;
- second step:
- turning over said plate and marking the position of said first chamfers and/or of at least one machined marking made during said first step of forming said first chamfers;
- third step:
- realizing on a second side of said plate, opposite to said first side, a second cut line or kerf on at least the inside of said contour, to form a second chamfer, in alignment with each said first cut line and each said first chamfer, for each of said crystals to be made from said plate;
- fourth step:
- separating said crystals from a skeleton of said plate by machining through said plate at each said contour of each said crystal to form an edge of said crystal.
Dependencies are inferred from the claim text.