The cam mechanism for periodic rotation includes a body, a drive shaft with a main cam mounted on it, a main gear connected to the driven link shaft, rollers mounted on it that interact with the main cam, an elastic link and two additional gears that interact with the main gear. In this case, the elastic element is connected to an eccentrically mounted pin on the additional gears, and the working profile of the cam is made open along the minimum radius vectors. In addition, the additional gears are fixed in the housing, and an additional profile is fixed on the cam, which forms a groove with the cam, which interacts with the rollers at the initial moment of rotation of the driven shaft.

The utility model belongs to mechanical engineering, namely it refers to rotary devices, and can be used to convert a constant rotational motion into a periodic swivel motion.