* Emergency stop: see chapter 2.1
39
Fig. 14-2
14.2
CONTROL BLOCK
The control block contains the five LC valves that control the main functions of the machine. They
do not have V numbers, but have the same number as the electric cables to which they are
connected.
(See the diagram of connections, fig. 13.1.)
1.
Cutter "open".
2.
Cutter "close".
3.
Roller width "in".
4.
Roller width "out".
5.
Start roller and wrapping arm.
The cutter
To prevent the pressure on the cutter reducing so that it does not hold the plastic film for sufficient
time, there is a double pilot-controlled check valve
(A, fig. 14-2)
below the solenoid valves for the
cutter.
Below the check valve on the block itself there is another check valve which stops any pressure
surge in the return hose opening the pilot-controlled check valve.
An adjustable throttle valve
(B, fig. 14-2)
is fitted on the plus side of the cutter cylinder on TWIN
machines. This is used to adjust the speed of the cutter when it opens.
(On standard machines there is also a throttle, but this is fixed and is fitted inside the valve block.)
