Full Sequential Action Mechanism - Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual

(5) Full sequential action mechanism

Press the Pushing Lever [64] against the
workpiece and move the Chamber [24] to the
uppermost position. Then the nailer operates only
when the Trigger [98] is depressed. The nailer
does not operate if the pressing amount of the
Pushing Lever [64] is insufficient or if the Pushing
Lever [64] is pressed after depressing the Trigger
[98].
When depressing the Trigger [98] after pressing
the Pushing Lever [64]
The convex portion of the Chamber [24] pushes up
the Tension Plate [113] and rotates when the
Chamber [24] reaches the uppermost position.
Therefore, the end of Switch Lever (B) [114] is
moved toward the Trigger [98] (Fig. 9).
The Lever Stopper [116] at the side of the Trigger
[98] does not prevent Switch Lever (B) [114] from
rotating (Fig. 10). The switch is turned on and nails
are driven by depressing the Trigger [98].
When pressing the Pushing Lever [64] after
depressing the Trigger [98]
When depressing the Trigger [98], the Lever
Stopper [116] is deformed by the Trigger [98] and
the end of the Lever Stopper [116] is positioned
toward Switch Lever (B) [114]
(Fig. 11).
Then the convex portion of the Chamber [24]
pushes up the Tension Plate [113] when the
Pushing Lever [64] is pressed. However, the Lever
Stopper [116] prevents Switch Lever (B) [114] from
rotating. Thus the switch of the Trigger [98] is not
turned on.
Tension
Plate [113]
Convex
portion of
the Chamber
[24]
Pushing Lever [64]
Lever Stopper [116]
Lever Stopper [116]
--- 15 ---
A
Fig. 9
Switch Lever (B)
[114]
Trigger [98]
Fig. 10 (A --- A)
Switch Lever (B)
[114]
Trigger [98]
Fig. 11 (A --- A)
Switch
Lever (B)
[114]
A
A
Trigger [98]