Manipulators for plate sheets

In a manipulator for plate sheets which comprises a supporting structure with two jaws (5, 10) vertically disposed and axially aligned capable of grasping a plate sheet (22) horizontally disposed corresponding to the loading zone, said structure having means for actuating said manipulator, said means permitting the linear displacement of said sheet up to a folding press (23), means acting on said jaws capable of determining the rotation around their axis for the purpose of permitting said sheet to be subjected to a folding operation in at least one of its borders, the improvement which comprises said supporting structure having the shape of a double T with one upper element (1) being provided in the portion corresponding to the extremity of one of its wings with the seat for the shaft of the upper jaw (5), and a lower supporting element (3) pivoted to said upper element at the pivot point (2) corresponding to the central zone, said lower supporting element (3) having pin (11) pivoted to a transversal carriage (12), said transversal carriage being slidable along guide (13), said guide (13) being disposed in the perpendicular direction with respect to the area of juncture between the loading zone of the plate and the press, said guide being located laterally with respect to said area of juncture, its direction intersecting same corresponding to its central line, said guide being fixed to a fixed base (14), said base laterally with respect to the zone wherein said jaws are located, having a vertical extension, the lateral extremity of said lower supporting element (3) being pivoted to a longitudinal carriage (8) by means of supporting shaft (9) of said lower jaw (10), said longitudinal carriage (8) having laterally blocks (15), said blocks (15) sliding along linear guides (15') located on the vertical portion of said base (14), said guides extending in a parallel direction with respect to the line joining the loading zone and the press, means (16, 17 and 18) for determining the advance of said longitudinal carriage (8) along said guides and means (19, 20 and 21) capable of determining the rotation of said shaft (9) and said lower jaw (10).