Automatic machine and automatic method for grinding the edges of glass sheets

An automatic machine for grinding the edges of a perimeter of rectangular or non-rectangular contoured glass sheets that are substantially planar and arranged vertically or slightly inclined with respect to the vertical, comprising a machine body provided with a bottom configured to contact a floor surface, a pseudovertical resting and sliding surface, preceded by a corresponding upstream pseudovertical resting and sliding surface and followed by a corresponding downstream pseudovertical resting and sliding surface and with corresponding motorized support and conveyance rollers or belts, arranged below respective pseudovertical resting and sliding surfaces and actuating a synchronous axis for the conveyance of the lower portion of said glass sheet and of at least one pair of working heads, which can move with respect to said glass sheet along the perimeter of said glass sheet with a synchronous feeding motion and provided with a synchronous rotary motion, each one of said pair of working heads being movable on corresponding vertical carriages provided with a synchronous vertical translational motion along vertical axes and comprising a fixed body and a rotating body, each fixed and rotating body ending with a working head which comprises a tool of the type with a rigid grinding wheel which has a circular shape in rotation with a cutting motion in order to perform said grinding, adjustable with an adjustment motion along respective axes, which are perpendicular to the plane of said glass sheet, wherein through said machine body and said motorized support and conveyance rollers or belts and an input conveyor and said motorized support and conveyance rollers or belts and an output conveyor and said motorized support and conveyance rollers or belts, or part thereof, at least two conveyance means configured for conveying said glass sheets, a lower conveyance means configured to provide synchronous movement along a lower axis and an upper conveyance means configured to provide synchronous movement along an upper axis, the lower axis being closer to the bottom of the machine than the upper axis, which actuate respectively the synchronous motions about respective axes, engage and convey said glass sheets, said glass sheets being interfaced alternately, odd sheets of said glass sheets with said lower conveyance means and even sheets of said glass sheets with said upper conveyance means.