Prashun,
As I just replied to Chris, I'm puzzled why the short table saw rip fence is so little known to most
Americans. Like I said, I read of it shortly after getting my table saw in 1979 and it just made sense to me.
I might have seen it described in a book back then as the internet was still an academic toy. I suspect our European members are ROFLing at American now.
You're right in that it does essentially nothing if the wood closes on to the blade. As Chris pointed out, only a riving knife can save you then. It does save you if the fence is somehow toe-in toward the blade as my Emerson/Craftsman fence can be if not carefully squared up before it is tightened down.
BTW, I still use the much maligned original fence, I just tap the head against the rail with a mallet I keep handy before tightening.
-- Teri