Abstract: The machine comprises a large-diameter rotating cylinder which co-operates upstream with a conveyor belt which feeds triangles of dough thereto and co-operates downstream with a lower rolling and unloading belt and with an upper rolling belt, forming a seat with sliding walls in which said triangles are rolled.The lower rolling belt is stretched between a motorized roller and a return blade the axis whereof is parallel and adjacent to the axis of the above mentioned rotating cylinder. The blade is associated on an eccentric axis with means adapted to oscillate it between preset angular positions. Means adapted to recover the tension of the belt during the oscillations and means adapted to synchronize said oscillations with all the other movements of the machine are furthermore provided.