Step 1: Add the Belt-Path:
Edit a Part, and sketch a sketch-loop with Lines and Arcs. The sketch-loop will become the path of the Belt.
Make sure you add a dimension to each Arc. Also, it is best to make the sketch fully constrained [the sketch should be black]
Step 2: Add a Motion-Point to the Belt-Path.
Use 'Add Motion-Path FB' and select the sketch-loop. This adds a Motion-Point to the 'Belt'.
The Motion-Point indicates the motion of the Belt.
Step 3: Add the Pulley Part:
Add a rotating-Part, with a Pin-Joint at the centre-Point of an Arc in the sketch-loop. The rotating-Part becomes a Pulley.
The rotating-Part may be:
Step 4: Add the Pulley:
Use Add Pulley [see the Command-Manager to select the correct elements].
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Kinematics of Pulley-Rocker
The complete kinematic-chain is the:
It is a Part with a Pin-Joint and a Path-Joint.
The Path-Joint shows when you use Add Pulley.