Maschinenvertrieb
LIYU DMS GmbH
www.liyu-dms.com
46
Positive pressure ink refers to impressing ink of the auxiliary ink tank into the print head
by pressing positive pressure button to eliminate the air in the nozzle and flush through
the nozzle blocked not so seriously, as well as solve some common problems of printing
disconnection.
You can impose positive pressure to either a single print head or several or all print heads
with the specific operation steps as follows:
Move the carriage to idle position, the far left of the machine.
Make sure that the corresponding ink route three-way valve body for the print head
demanding ink impression is in working state. In case there are other print heads
for the same color, switch the corresponding ink route three-way valve body of other
print heads off.
Turn the pneumatic three-way valve body to positive pressure state.
Press positive pressure button and hold for a while, observe the ink out status of
print head and release positive pressure button when you feel ink flowing smoothly.
Wait for two seconds and wipe the nozzle surface with clean non-woven fabrics.
Negative Pressure Adjustment
Since negative pressure is an important factor for guarantying print quality, the operation
of its adjustment is crucial. The target of adjustment is to make ink form meniscus in every
nozzle printer. As long as sound meniscus is maintained, we can assure that ink droplets
are ejected at a high speed with few flight drops. Vacuum negative pressure system is
applied to this printer.
Negative pressure system introduction
As described above, FH series products have the standard configuration of negative
pressure design for color print heads. If you also equip the product with ink degasser,
another line of negative pressure system will be added to provide high negative
pressure for ink degasser. Vacuum pressure switch is used to adjust all the negative
pressure of print heads and located on the left front console panel (see introduction
of “
Left Front Console Panel
”). Degasser is connected with vacuum negative
pressure components by means of high negative pressure switch. You may see it by
opening the left side door behind the machine. (See Article 12 of front view for details)
Introduction of vacuum pressure switch
