Integrating device to detect and recover the deformation of shoulders in a press-bending machine, including an optical ruler joined to the beater and reading trolley, pulled back elastically, and stressed by the false shoulder. The device provided for the false shoulder is made up of a rod perpendicular to the beater, which on one side is hinged to the shoulder of the machine, while on the opposite end, oscillating and facing the beater. It is stressed by the arm joined to the reading trolley of the optical ruler. The rod provides a slider in connection with an underlying plane plate that is part of the false shoulder.