Patent claim: A method for performing incision and breaking operations on glass plates L in particular laminated glass plates comprising two overlapped glass layers with a film of synthetic material interposed between them wherein it is arranged asa fixed work bench 1 defining a supporting plane 2 intended to receive the plate L to be processeda fixed cutting bridge 3 equipped with an upper carriage 4 and a lower carriage 5 movable along the cutting bridge 3 in a direction Y parallel to the longitudinal direction of the cutting bridge 3said upper carriage 4 and said lower carriage 5 carrying an upper incision tool 6 and a lower incision tool 7 respectively for the incision of the upper and lower layers of the glass plate Lsaid cutting bridge 3 being provided with actuating means for the movement of said upper 4 and lower 5 carriages along the Y directionmeans for moving 8 9 10 said plate L on the fixed bench 1 in a horizontal direction X perpendicular to the aforesaid direction Y andmeans for the electronic control PC of said actuating means for the movement of said upper 4 and lower 5 carriages along the Y direction and said means for moving 8 9 10 the plate L in X directionboth the upper incision tool 6 and the lower incision tool 7 being rotatably mounted 16 17 about an axis Z1 perpendicular to the X direction and the Y directionmeans for moving 8 9 10 said plate L on the fixed bench 1 in a horizontal direction X perpendicular to the aforesaid direction Y andmeans for the electronic control PC of said actuating means for the movement of said upper 4 and lower 5 carriages along the Y direction and said means for moving 8 9 10 the plate L in the X directionboth the upper incision tool 6 and the lower incision tool 7 being rotatably mounted 16 17 about an axis Z1 perpendicular to the X direction and the Y direction and wherein the electronic control means PC control during the incision operation of the glass plate L a movement in the X direction of the plate L and a movement in the Y direction of said carriages 4 5 such movements being coordinated with each other so as to obtain an incision according to a predetermined path T S Q in the plane of plate L with rectilinear andor curved lines and without the need to impart a rotation to the platesaid upper and lower incision tools 6 7 being always orientated during the incision operation according to the tangent of the incision path at the point of the path in which they are located said method being characterized in that at least one breaking tool 18 20a 21a 32a 33a is provided for breaking at least one glass layer of the plate said breaking tool 18 20a 21a 32a 33a being carried by one of said upper 4 and lower 5 carriages and in that the aforesaid electronic control means PC control during a breaking operation of the glass plate L subsequent to an incision operation a movement in the X direction of the plate L and a movement in the direction Y of said at least one carriage 4 5 carrying said at least one breaking tool 18 20a 21a 32a 33a these movements being coordinated in such a way as to obtain breaking of said at least one layer of the plate according to the aforesaid predetermined path T S Q in the plane of the plate L with rectilinear andor curved lines and without the need to impart a rotation to the plate.

Related passage: Finally the electric motors that drive the various mobile parts of the machine such as for example the slides or the bridges 21 and 23 are not illustrated in the annexed figures and are controlled by the electronic control means PC which are programmable in a known way to enable execution of predetermined machining cycles on the sheets to be machined.