Operation Principle - Hitachi NT 65M2 Technical Data And Service Manual

8-2. Operation Principle

(1) Before nailing (See Fig. 4 and Fig. 5.)
1) When compressed air is fed to the main body, it
fills the accumulator (
2) At the same time, the compressed air flows into
the valve piston lower chamber of the control valve
section and forces the Valve Piston [63] upward.
Compressed air is then fed through the air supply
vent and air passage to the head valve chamber.
As a result, the Head Valve Spring [8] is pushed
down to seal Head Valve (A) [10] and the Cylinder
[13].
(2) When nailing (See Fig. 4 and Fig. 5.)
1) When Pushing Lever (A) [43] and Trigger (C) Ass'y
[36] are operated together and the Plunger [67] is
pushed upward, the compressed air in the valve
piston lower chamber is discharged from the
bottom of the Plunger [67]. As a result, the
compressed air in the accumulator (
pushes down the Valve Piston [63], blocking the
air supply vent and opening the exhaust valve.
2) When the exhaust valve opens, the compressed
air in the head valve chamber is discharged into
the atmosphere through the air passage.
3) When the air pressure on the bottom surface of
Head Valve (A) [10] overcomes the strength of the
Head Valve Spring [8], Head Valve (A) [10] is
pushed upward. At this time, Head Valve (A) [10]
seals with the Exhaust Cover [5], blocking the
passage to the exhaust vent.
4) When Head Valve (A) [10] goes up, the
compressed air in the accumulator flows rapidly
into the Cylinder [13], forcing the Piston [12]
downward to strike the nail. When the Piston [12]
passes the cylinder hole, the compressed air flows
into the return air chamber and is accumulated
there.
portion).
Head Valve (A) [10]
portion)
Head Valve Spring [8]
Accumulator
Piston [12]
Cylinder hole
Cylinder [13]
Return air chamber
Pushing Lever (A) [43]
To the head valve chamber
Air passage
Exhaust valve
Valve piston
lower chamber
Fig. 5 Control valve section
--- 10 ---
Head valve chamber
Air passage
Control valve
section
Trigger (C)
Ass'y [36]
Nail
Fig. 4
Air supply vent
Accumulator
Valve piston
Control valve section
Plunger [67]