Berner BPT-RCN-19-45-15 Manuel D'utilisation Et Entretien page 14

B) ACTUATION SYSTEMS
Air driven fastening tools are available in a variety of operating modes to suit a range of operator preferences and application
needs. All tool operators and their immediate foremen must fully understand the operating features of the actuation system
type being used before attempting to operate tool.
See the schematic view of the tool for cross-reference on each of the actuation systems described below:
1) Single actuation
Single actuation allows a fastener to be driven each time the trigger is depressed, and requires no safety yoke to be activated.
The trigger actuates the tool and must be squeezed each time a fastener is to be driven. No touch safety is present on this
type of tool. This operating mode requires the immediate release of the trigger after each fastener is driven.
2) Single sequential actuation
The trigger and the safety yoke have to be operated in such a way that one single driving operation is actuated via the trigger
after the tool muzzle has been applied to the driving location. Thereafter, any further driving operation can only be actuated
after returning the trigger to the starting position. The safety yoke does not need to be detached from the work plane.
3) Full sequential actuation
Full sequential actuation prevents a fastener from being driven if the safety yoke is depressed while the trigger is being held in
an activated position.
In this mode of operation, the safety must be depressed against the work surface before the trigger becomes functional.
When the safety is depressed, the trigger can be depressed, causing a fastener to be driven. The trigger and the safety must
be released after each fastener is driven. When pressing again the safety yoke against the work piece without releasing the
trigger first, or when keeping the safety depressed and the trigger is released and then depressed again, the tool does not
operate. This sequence (depress safety / pull trigger / drive fastener / lift tool / release trigger) must be repeated each time a
fastener is to be driven.
This mode of operation is suitable for use in applications requiring precision placement of fasteners, applications involving
confined areas or tight spaces that restrict manoeuvrability and prevent the operator from allowing the tool to recoil away from
the work normally, or in applications where operators may need to change position frequently while making fastenings.
It is also suitable for clinching operations, where the tool cannot be allowed to recoil and must be pressed down firmly against
the work to clinch the fastener point.
4) Contact actuation
Contact actuation permits "bottom-trip" or "bounce-fire" operation while the trigger is activated, or trigger-fire operation while
the safety yoke is activated.
In this mode of operation, both the trigger and the safety yoke have to be actuated for each fastener to be driven, but do not
have to be actuated in any specific order. When this mode of operation is being used, the trigger may be held in an actuated
position while the safety yoke is placed in a series of successive fastener driving positions, using a bouncing motion that
utilizes the recoil of the tool to help position the tool for each successive fastener driving operation.
This mode may also be used for trigger actuation, but does not require that the trigger be released before the next fastening
operation can be performed.
Contact actuation is suitable for applications requiring rapid repetitive nailing operations without precise fastener placement,
such as in fastening roof and floor decking, wall sheathing, and other applications where normal tool recoil can be easily
controlled and used to help place the tool for successive fastener driving.
5) Continuous actuation
In this mode of operation, the tool drives fasteners continuously as long as the trigger remains activated. This mode does not
utilize a safety yoke.
6) Continuous sequential actuation
The trigger and the safety yoke must both be activated, but not in a specific order. In this mode, the tool drives fasteners as
long as the trigger and the safety yoke remain activated.
-) C.T./S.S. system (special device)
This is a patented system that allows switching the tool between Contact Trip operation and full sequential operation
(Single Shot), as required for the type of application being performed.
To place the tool in Contact Trip (bottom-trip / bounce-fire) mode, pivot the red actuator cap located just below the trigger to
the vertical, or "up" position. To return to sequential operation, pivot the actuator cap to the horizontal or "down" position. To
"lock" the red actuator cap in the sequential position, turn the actuator cap 180° so that the flat surface of the actuator faces to
the rear of the tool. To return the tool to Contact Trip from the "locked" position, rotate the flat surface of the actuator cap to
the front of the tool, and pivot the actuator cap back to the up position.
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