Welcome to SW forums Lim
Check these simmilar post:
Check this animation and SolidWorks files by Gerald Davis if this helps
Difficult animation (Chain Animation)
Re: Difficult animation (SolidWorks files used for above animation)
Re: Belt Simulation, How to show belt motion?
http://www.swgeeks.com/forum/topics/gearchain-mate (follow instructions/suggestions by Matt Perez)
Also read this post for your future reference: Forum Posting