17
A383 microlock man
14 FUNCTIONAL CHARACTERISTICS
Idle position
Because of the connection of the tool to the compressed air-net (connection P) compressed air flows through
flapper valve 3 to the flapper cylinder 19 and rocker cylinder 17.
As a result of this air-flow, the closing force of the spring of the flapper cylinder 19 is supported by compressed
air on the one hand (flapper closed) and the feed-wheel is lowered to the gripper on the other hand.
The closed flapper 27 holds open flapper security valve 4. Flapper security valve 4 opens the line to sealing
valve 5 and motor valve 6 (both closed) and also to pilot valve 8, throttle 10, diaphragm 13 and holding air
valve 14.
As a result, holding air valve 14 is kept closed. Compressed air is also conducted to the holding air throttle 11
directly from the main connection and stops at the closed holding air valve 14.
Inserting the strap
To insert the strap, the flapper valve lever 23 of the flapper valve 3 is lifted. The valve switches, the flapper
cylinder 19 opens the flapper 27 and the rocker cylinder 17 lifts the feed wheel.
After inserting the strap, the flapper valve lever 23 is released again; flapper valve 3 and both cylinders 17 and
19 stay again in their idle position. The throttles 1, 2, 16 and 18 avoid jerking motions.
Tensioning
By pressing down the motor valve lever 24 the motor valve 6 is commuted and catches in an open position.
Compressed air now flows from connection P through the flapper security valve 4 and motor valve 6, the
adjustable throttle valve 7 and through the non-return valve 12 to the air motor 22 and drives the latter.
The used air leaves the air motor through the muffler 21. At the same time also the control pistons of the pilot
valve 8 and the holding air valve 14 are admitted with pressure from the right.
The left control side of the holding air valve 14 is deaerated through pilot valve 8 and the holding air valve 14
opens the opening area from the holding air throttle 11 through the adjustable holding air throttle to the air
motor 22.
This state remains unchanged until the air motor 22 stalls (through overcharge). If the tensioning cycle has to
be interrupted the blocking of the motor valve 6 must be suspended (press down lever 28).
Because of this the catch 26 is hooked out through the ejection bolt 30. At the same time the holding air valve
14 is closed so that the air motor 22 stalls.
Remark:
If the strap is not transported after pressing the motor valve lever the procedure "Inserting the
strap"has to be done again. By pressing the flapper valve lever 23 the catch 26 is hooked out automatically.
So the started tensioning process is stopped and has to be restarted.
Sealing
The sealing action is started by pressing down the sealing valve lever 25. Sealing valve 5 switches and the
blocking of motor valve 6 is suspended.
The air motor 22 is held under pressure by the holding air throttle 11 and the holding air valve 14 in order to
avoid the rewinding of the feed wheel which is under pressure.
From sealing valve 5 compressed air flows to the pressure reduction valve 15 (to be adjusted at 5.3 bar/76
psi) as well as to the sealing cylinder 20. At the same time diaphragm 13 and through throttle 9 also pilot valve
8 are admitted with compressed air from the left.
Pilot valve 8 changes to opening and diaphragm 13 to locking. Since the right side of diaphragm 13 has a
smaller control piston surface than the left side, diaphragm 13 remains in a locking position and consequently
avoids the switching off of holding air valve 14. The piston of the cylinder 20 moves out and under the use of a
hydraulic pressure intensifier produces the necessary power to cut the sealing profile into the two straps and
to shear off the upper strap.
For Parts & Service 1-877-862-6699
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