Under properties you can change the thickness of belt and keep it in engaged or disengaged condition.
Select the inner faces of the pulley in the order you want to pass the belt.
This will open belt/chain property manager. Go to Insert -> Assembly Feature ->Belt/Chain. This will make individual pulleys rotate on its own axis Now arrange the pulleys and fix the pins. Make the front planes of the pulleys coincident so that they become confined by their planes. This will add two new mates to the assembly. Now drag the pin to the desired edge of the pulley and keep holding it till the pin arranges it automatically. It will turn transparent with a symbol of mating clip under the mouse pointer. Holding the Alt button select the line and drag it. For mating I will teach you an important and effective way. In a new assembly insert all the pulleys and corresponding number of pins Now in a new part make a pin for the pulley to hold the pulley in its position.for that make a circle and extrude it. Make 2 or 3 pulleys or more of different or same radius as per your wish. On the front plane make few holes for the key to be inserted and for design.the outer holes are for design purpose and also for the viewer to see the circular motion of the pulley. Open a new part and sketch the following on the top plane and revolve it around the axis to form the pulley. The link to the model is : Belt pulley System
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