The model of tappet is built from the Lego Wedo 2.0 educational kit. The model uses a combination of a belt drive and a worm-and-screw drive. When an object enters the area controlled by the distance sensor, the tappet mechanism is affected, which makes a translational movement and pushes the object out.
The set includes step-by-step building instructions and an example of program (in Lego Wedo 2.0 environment).