This article presents an analysis of the patterns of vibration of the mesh surface of a sorting machine equipped with a cam mechanism with an elastic element, taking into account the stiffness coefficient of the elastic element. As a result of the conducted research, the stiffness coefficient of the elastic element in the cam, the laws of change in the angular velocity of the rocker arm of the cam mechanism of the rice sorting machine, expressions determining the laws of vibration, as well as graphs of the dependence of the angle of inclination of the mesh surface and the velocity of inclination on the eccentricity value are presented.