The principal and printing machine of the paper cup machine Generally in the manufacture of paper cup machines, the cam in the cam mechanism of the machine makes a rotational movement that pushes the follower of the machine to reciprocate according to certain requirements. However, it is important to note in this process that for the follower of the machine to be in close contact with the point of action of the cam, as they are in point or line contact, this must be achieved using springs or external gravity.