Pneumatic pallet nailer

A pneumatic pallet nailer, comprising:

• a nailer body;
• a trigger member disposed on the nailer body;
• a pallet clamp controlling member disposed on the nailer body and comprising:
• an internal space;
• a first pipe communicated with the internal space, wherein an air in the nailer body enters the internal space through the trigger member and the first pipe;
• a second pipe for communicating the air in the nailer body with the internal space;
• a third pipe communicated with the internal space;
• and
• an actuating valve movably accommodated in the internal space, the actuating valve actuated and positioned at a first position or a second position;
• a pallet clamp cylinder communicated with the third pipe;
• and
• a pallet clamp actuated by the pallet clamp cylinder;
• wherein when the trigger member is not actuated, the air enters the internal space through the first pipe to generate a first direction force for pushing the actuating valve, the air enters the internal space through the second pipe to generate a second direction force for pushing the actuating valve, the first direction force is greater than the second direction force, and the actuating valve is maintained at the first position so as to prevent the air from flowing into the third pipe from the second pipe;
• when the trigger member is pressed, the air in the first pipe is released through the trigger member, so that the second direction force is greater than the first direction force, the actuating valve is pushed to be positioned at the second position, and the air is allowed to flow into the third pipe and then into the pallet clamp cylinder through the second pipe, so that the pallet clamp is actuated to clamp a workpiece.