Blind-rivet gun

A blind-rivet gun, comprising:

• a gun header comprising a blind-rivet ejecting pipe adapted to receive a blind-rivet;
• a cylinder separated from the gun header;
• wherein the cylinder comprises a first air inlet opening and a second air inlet opening;
• a piston slidably mounted in the cylinder adapted to divide the cylinder into a first air chamber and a second air chamber;
• wherein the first air chamber is connected to the first air inlet opening;
• and the second air chamber is connected to the second air inlet opening;
• and
• an air saving device comprising:
• a switch circuit;
• an air inlet pipe connected to a barometric pressure apparatus for receiving high pressure air;
• a first air outlet pipe connected to the first air chamber via the first air inlet opening;
• a second air outlet pipe connected to the second air chamber via the second air inlet opening;
• and
• a third air outlet pipe connected to the blind-rivet ejecting pipe;
• wherein the switch circuit is adapted to turn on a first connection between the air inlet pipe and the first air outlet pipe or turn on a second connection between the air inlet pipe, the second air outlet pipe and the third air outlet pipe;
• the piston is adapted to slide in the cylinder to generate an inner high pressure by alternatively supplying high pressure air to the first air inlet opening and the second air inlet opening;
• and the blind-rivet is adapted to be pulled in and pushed out of the blind-rivet ejecting pipe by the inner high pressure;
• wherein the switch circuit comprises a first valve;
• the first valve comprises a first valve anode and a first valve cathode;
• the first valve anode is electrically connected to an input terminal via a first switch;
• and the first valve cathode is grounded.