The law of motion of the driven link of the mechanism should be chosen based on the requirements for the operation of the mechanism: general (for lifting and lowering sections, displacement, speed and acceleration at the beginning and end of the interval correspond to the set values); due to the nature of the diagram of movement of the driven link and closure of the highest kinematic pair cam — roller; determining the type of functions of ideal movements, speeds and accelerations, as well as the technological load and its derivatives, not at the boundaries of the interval of displacements, but at its individual sections.

In the works, the dynamic constants of displacement Ag, velocity Bg, acceleration Cg, and kinetic power Dg are used as criteria when choosing the law of motion. These dynamic constants are introduced for the run-up period Cg1 and Dg1, the run-out Cg2 and Dg2, and at the end of the forced displacement interval Ag1, Bg3, Cg3, Dg3. Additionally, on the interval of displacement of the driven link from 0 to Ymax dynamic constants (Ag1, Bg1) are introduced, and on the interval of displacement from Ymax to Y, the constant Bga is introduced.