Machine for and method of chamfering of edges of plate-shaped workpieces, particularly glass disks

Claim 1

A machine for simultaneously chamfering two elongated edges which limit an end surface of a plate-shaped workpiece having two outer surfaces at both sides of the end surface and a thickness between the outer surfaces so as to form two chamfers spaced from one another in direction of the thickness, the machine comprising two peripheral grinding wheels each having an axis of rotation, said grinding wheels being movable relative to said workpiece and rotatable about the axes of rotation in opposite directions each from a respective one of the outer surfaces toward the end surface and also movable along a respective one of the edges with an offset relative to one another so as to grind two chamfers, said peripheral grinding wheels being formed as truncated cones oriented with the diameters thereof decreasing in the direction of movement relative to the workpiece and arranged so that their axes of rotation during grinding extend substantially parallel to the edges to be chamfered; and means for moving and rotating said peripheral grinding wheels.

Claim 3

A method of simultaneously chamfering two elongated edges which limit an end surface on a plate-shaped workpiece having two outer surfaces at both sides of the end surface and a thickness between the outer surfaces so as to form two chamfers spaced from one another in direction of the thickness, the method comprising the steps of providing two peripheral grinding wheels formed as truncated cones; moving the peripheral grinding wheels relative to the workpiece each along a respective one of the edges with an offset relative to one another, said truncated cone grinding wheels being oriented with the diameters thereof decreasing in the direction of movemnt relative to the workpiece; and rotating the peripheral grinding wheels about their axes, which extend parallel to the edges of the workpiece, in opposite directions each from a respective one of the outer surfaces toward the end surface.

Claim 4

A method of simultaneously chamfering two elongated edges which limit an end surface on a plate-shaped workpiece having two outer surfaces at both sides of the end surface and a thickness between the outer surfaces so as to form two chamfers spaced from one another in direction of the thickness, the method comprising the steps of providing two peripheral grinding wheels formed as truncated cones; moving the peripheral grinding wheels relative to the workpiece each along a respective one of the edges with an offset relative to one another, said truncated cone grinding wheels being oriented with the diameters thereof decreasing in the direction of movemnt relative to the workpiece; and rotating the peripheral grinding wheels about their axes, which extend parallel to the edges of the workpiece, in opposite directions each from a respective one of the outer surfaces toward the end surface.