Percussion sawing machine to saw stone blocks into slabs

Percussion sawing machine to saw stone blocks into slabs, comprising a stiff support framework, a blade frame performing an alternate movement inside said framework along a substantially horizontal and at least partly rectilinear trajectory, means to suspend the blade frame from said framework, and means to effect vertical translation of said suspension means, said means to suspend the blade frame comprising four oscillating support devices, fixed to four corners of the blade frame, each consisting of a cam member which bears in rolling relationship on a corresponding track, the cam member being pivoted idle on a pin fixed to the blade frame and the bearing track being fixed to said vertical translation means or vice versa, each oscillating support device also comprising a pair of cooperating toothed elements, fixed respectively to the cam member and to the bearing track, so as to allow their rolling relationship without skidding, and said toothed elements comprising at least one tooth of further depth in respect of the normal coupling profile, so as to impart to the blade frame, along said rectilinear part of the trajectory, at least one rapid jumping movement of small amplitude in a vertical direction, to impart corresponding blade percussions onto the bottom of the respective channels cut into the stone block.