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8. MECHANISM AND OPERATION PRINCIPLE
8-1. Mechanism
As illustrated in Fig. 3, the Model NR 83AA3 can be generally divided into four sections:
output section, control valve section, driving section and magazine section.
The basic construction of the Model NR 83AA3 is the same as that of the Model NR 83AA2. The magazine
section is common to that of the Model NR 83AA2. However, most of the parts of the control valve section were
newly designed to provide the single actuation (single sequential actuation)/contact actuation mechanisms in
order to correspond to the modification of the ANSI standard. The pushing lever of the driving section has been
newly designed. Besides, some parts of the output section were changed.
Primary differences from the Model NR 83AA2 are described below.
Output section .....
Driving section .....
Control valve section ... Following parts were changed or added owing to the change of the construction
Cylinder: The sealing surface where the head cap contacts was chamfered (common to
the Model NR 83A2).
Exhaust valve: Provided with a hole (1 mm dia.) to prevent malfunction when selecting the
single actuation (single sequential actuation) mechanism (common to the
Model NR 83A2).
Body: An air escape groove was provided at the inmost position of the trigger valve
bushing. The body is not interchangeable with that of the Model NR 83AA2.
(Refer to 8-2 (1)
Pushing lever: Newly designed.
(selectable either the single actuation mechanism or the contact actuation mechanism).
Plunger (A): Changed (common to the Model NR 83A2).
Plunger (B): Changed (common to the Model NR 83A2).
Plunger (B) spring: Added (common to the Model NR 83A2).
Valve bushing: Changed (common to the Model NR 83A2).
Valve sleeve (A) (switching device): Added (common to the Model NR 83A2).
for details.)
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