HOW AN AUTOCOCKER WORKS
Now there are two basic parts to a cocker. First you have the firing action. When you first pull the trigger the sear will let go of the lug. The lug is the thing on the hammer. When you are adjusting the timing you adjust the lug. But when you pull the trigger the sear inside of the trigger lets go of the lug and the hammer hits the pin valve. Now in normal guns when the striker or hammer hits the pin valve it releases air out the back to cock the gun but a cocker doesn't do this. When the valve pin is struck it just lets air out the wholes which lead to the bolt. The hole in the bottom of your bolt is the whole that the air travels through. If you have the bolt upside down it won't shoot because the hole isn't lined up with the valve. It also important to have your back block a certain distance away fromt he body so the bolts hole is lined up with the valve. You want it about paper thin away from the body. But not too close or too far so that you can fit a peice of cardboard in it.
Let me say this again. The firing part of the cocker is just the sear letting go of the lug and the hammer hitting the valve pin opening the valve letting air into the bolt firing the gun. Now if you fire the gun then it needs to recock. Thats where the pneumatics come in to play.
After the gun fires the timing rod will be pulled (with sliding triggers) or pushed (pivot triggers) so that the 3 way will reverse letting air into the ram pushing it back causeing the back block to move back. I say reverse because when the gun is gased up and just sitting there the 3 way is open just the other way so the back block is sucked to the gun. The air is keeping pressure on one side of ram keeping it back. When you pull the trigger the 3 way operates like a valve. Now when the timing rod moves it moves the o-rings inside from blocking some of the 3 holes in the 3 way to others so the air reverses and it pushes the pump arm back pushing the back block back. Notice if you hold down the trigger the back block stays back. This is because there is air running into the ram still. It doesn't go forward until you reverse the air flow in the 3 way.
Now when you let go of the trigger the 3 way reverses the air so it pushes it forward. Now the sear is in place alos because you let go of the trigger. The cocking rod is connected to the hammer and the hammer has the lug in it. So when the back block pulls the cocking rod back its pulling the hammer back and the lug is now behind the sear. So when the trigger is let go the sear catches the lug and the process is started over again.
I have a diagram of this action in my Timing and Taking Apart an Autococker.
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