Method for cutting watch crystals
AssigneeThe Swatch Group Research and Development Ltd
InventorsJean-Luc Bazin, Martin Gunn-Sechehaye
Life of this patent
Estimating the term…
Abstract
A method for cutting watch crystals along a plurality of contours in a plate of transparent material includes forming a first cut line or kerf to form a first chamfer for each of the crystals of the plate and marking at least one machined recess on a first side of the plate, turning the plate over and marking at least one of the position of the first chamfer and the position of the at least one machined recess, forming a second cut line or kerf to form a second chamfer for each of the crystals on a second side of the plate, and separating the crystals by machining through the plate at each of the contours to form edges of the crystals.
Claims13
A method for cutting watch crystals along a plurality of contours in a plate of transparent material, comprising:
- first step:
- forming on a first side of the plate, a first cut line or kerf on at least the inside of one of the contours, to form a first chamfer, for each of the crystals to be made from the plate, and making at least one machined recess on the first side of the plate;
- second step:
- turning over the plate and marking at least one of the position of the first chamfer and the position of the at least one machined recess;
- third step:
- forming on a second side of the plate, opposite to the first side, a second cut line or kerf on at least the inside of the one of the contours, to form a second chamfer, in alignment with the first cut line and the first chamfer, for each of the crystals to be made from the plate;
- and
- fourth step:
- separating the crystals from a skeleton of the plate by machining through the plate at each of the contours to form edges of the crystals.
Dependencies are inferred from the claim text.