How does the vibration used to control the position of different pieces is made in a flex feeder?

ricardoef98

I am researching on how to make a flex feeder on my own, but the components i intend to use are really expensive, so i really need to know or have an opinion of thought on how does asyril or flex-factory make this vibration with whom they can control the posion and the movement of the pieces or parts in the playe