Automatic rebound in a rivet gun relies on the built-in return spring releasing stored elastic energy. This works with the trigger locking mechanism unlocking to drive the piston rod quickly back to its original position. After each riveting cycle, the piston rod returns automatically.
Core structure
Automatic rebound depends on three parts:
Return spring: installed in the cavity or housing at the rear of the piston rod. It stays extended in the normal state. When the piston rod moves backward, the spring is compressed and stores elastic energy.
Trigger locking mechanism: holds the piston rod in the standby state. Pulling the trigger unlocks it and connects the power path. Releasing the trigger opens the return release path.
Piston rod assembly: the front end has a jaw locking mechanism, and the rear end has a stop ring. The stop ring transmits the return spring force to move the piston rod.
Working process
(1) Initial standby state
The return spring is naturally extended. The piston rod stays at the front standby position. The trigger locking mechanism holds the piston rod to prevent accidental triggering. The front jaws are open and can fit over the rivet mandrel.
(2) Riveting stage
Pull the trigger. The trigger unlocks the piston rod limit. Pneumatic models connect compressed air. Electric models start the motor and reduction drive mechanism. The piston rod extends forward. The stop ring at the rear compresses the return spring and stores elastic energy in the spring.
The front jaws move forward with the piston rod and fit over the rivet mandrel. The jaws then lock the rivet automatically. The power source pulls the piston rod backward, deforms the rivet, and completes the riveting joint.
(3) Automatic rebound stage
Release the trigger. The trigger locking mechanism cuts off the power path and opens the return release path. The return spring, which has stored elastic energy, extends quickly and pushes the piston rod back to the initial standby position through the stop ring.
As the piston rod returns, the front jaws move back. The jaw mechanism unlocks automatically and releases the rivet. This completes the automatic rebound cycle.
We can machine custom jaws, piston rods, return spring seats, and other precision parts for rivet guns from customer drawings, for single-piece or low-volume production.
Our custom precision component machining capability is not limited to rivet guns. Beyond jaws, piston rods, and spring seats, we also machine yacht precision components, RC car structural parts, medical device parts, and non-standard parts for tobacco packaging machinery, filling machinery, and printing machinery. Hansheng Automation works from customer drawings and production quantities to deliver single-piece or low-volume precision machining.
