Flora Digital Printing System
Model LJ320P
Copyright 2011@ Shenzhen Runtianzhi Image Technology Co.,Ltd. By Victor Xu
~ 30 ~
5/2 way
Valve
Push-button
Activated
5/2-way Valve(331-0329-000)
Current
Value
Set
Value
Pressure Sensor
(312-0078-014)
the tubes are filled with overflowed ink.
There are one ink protection tanks fixed behind the secondary ink tanks!
Note: There are three actual scenarios where the overflow happens.
1. The ink overflow situation will happen when the ink tank level sensor fails to detect the full
level while the ink pump tends to turn-on and ink is keep on flowing into the ink supply circuit;
hence, ink will flow towards the ink protect tank (IPT).
2. The ink level wire connection is wrong at the print head control board connection port.
3. The ink pump wire connection is wrongly connected (reverse connection with the other ink
pump).
4.5.6 Other parts intro
Pressure Sensor
The pressure sensor is an electronic programmable
sensor that is used to detect both the negative and positive
pressure. The tube line is provided to connect the sensing port of
the pressure sensor to the IPT. Any level of pressure in the IPT is
online displayed and sensed to signal the appropriate output
(OUT1 or OUT2) to further trigger the part/component to protect
the negative pressure system. The parameter setting is set by
the sensor panel keypad; this parameter is used to program the
sensor output control characteristic and display indication.
Pressure Regulator (Flow Control Valve)
The flow control valve is actually a pneumatic valve that is used to
restrict the flow of air. In the negative pressure circuit, the flow control
valve is adjusted appropriately to achieve the right negative pressure
needed by the ink supply system. Adjusting the flow control valve will
in-turn adjust the negative pressure that goes to the print heads; therefore,
acquiring the correct amount of force to hold the ink just on the mouth of
every print head nozzle holes.
5/2 way Valve (Purge Button)
A mechanically activated pneumatic valve serves
as to switch-over the negative pressure to positive
pressure. At normal operation, the suction effect of
negative pressure (vacuum) is connected towards print
heads. During the ink priming operation, the 5/2-way
pneumatic valve is manually activated, the air (positive
pressure) will replace the vacuum and flows towards the
print heads and therefore the ink in the print heads are
Flow Control Valve
(331-0239-000)
Adjustment
Knob
Fig. 4.5.521: Shut-off Valve
(141-0436-001)
Open
Close
Fig. 4.5.5.1: Ink Protect Tank (IPT)
(312-0010-031)
Drain
