Unrolling device, particularly for materials in rolls, with material alignment control

An unrolling device for materials in rolls, comprising means for unrolling a roll of material to be unrolled, further comprising means for detecting at least one lateral edge of the material unrolled from said roll which are adapted to detect quantitatively the movement of said edge transversely to the unrolling direction of the material, wherein said means for indicating the quantity of movement comprise a rod-like element which is pivoted at opposite ends of said synchronous conveyor belts or rollers, said rod-like element being provided, at least one region adapted to face said material unrolled from said roll, with a graduated scale, and wherein the means for detecting the at least one lateral edge is configured to detect the amount of lateral movement of the material based on the graduated scale.