Standard

Roller: A regular pulley has a slot for a belt, chain or cable. A reel is a wider pulley generally utilized in cable techniques, allowing the cable to be wound around several moments the diameter of the reel.
Active Pulley: The “enter” pulley in a dual-pulley method. The shaft of this pulley is driven by something like a motor, a crank, or probably another pulley in greater techniques. This pulley controls the motion of the belt.

Standard