Patent ID: 7134936

Claim:
A grinding head for a grinding machine for grinding a glass slab having an edge and threads comprising: a) at least one supporting structure; b) two first grinding wheels for grinding the edge of the slab, the two first grinding wheels being supported and rotatingly driven by two respective first spindles, the two first grinding wheels and the two first spindles being contained in and supported by the supporting structure; c) at least one second grinding wheel for grinding the threads of the slab, the second grinding wheel being supported and rotatingly driven by a second spindle, the second grinding wheel and the second spindle being contained in and supported by the supporting structure; d) at least one third grinding wheel for polishing the edge of the slab, the third grinding wheel being supported and rotatingly driven by a third spindle, the third grinding wheel and the third spindle being contained in and supported by the supporting structure; and e) at least one fourth grinding wheel for polishing the threads of the slabs, the fourth grinding wheel being supported and rotatingly driven by a fourth spindle, the fourth grinding wheel and the fourth spindle being contained in and supported by the supporting structure; where the first and third grinding wheels for grinding and polishing the edges rotate, independently one from another, around an axis that is perpendicular to a rotation axis of the second and fourth grinding wheels for grinding and polishing the threads; where the first, second, third and fourth grinding wheels for grinding and polishing the edge and grinding and polishing the threads are configured to perform, during operation, axial movements along the slabs; and where the axial movements of the first, second, third and fourth grinding wheels are independently actuated one from another.