John and Ptree,
Please let me start by saying I am a hobby smith that knows less about Pnuematics than my dog. I think I now understand how this is supposed to work and this post has provided a missing bit.
Tell me if I have this right. The 2 position, 4 way, 5 port valve's exhaust is connected to the "button" (what you use to start the hammer). As long as the exhaust is blocked no air can move. Since no air can move the hammer can't move.
The roller valve is (tell me if I am wrong, I can take it) in a "pressed down" state when the hammer is up top. This shoots air to the 2/4/5 valve to send the ram down. Once the hammer falls the roller valve closes and the 2/4/5 valve sends the ram up. As long as the exhaust is blocked no air can move at all, open the valve blocking the exhaust and the 2/4/5 valve and the roller valve can do their thing.
Is that about it?
Ernest