Movement chain along path

Hi,
as you can see here [Removed link from me, because has changedthevideo] I would like to obtain the same result.
I've inserted two roller chain and mated.
I used the belt/chain assembly feature to create path and relationfrom them.
Now I used the path mate to relationate the chain to the belt/chainassembly feature.
Now, how I can relationate the roller chain rotation to the chainpath movement ?

Thank you,
AlessandroSolidworksAssemblies