Weber Markoprint XB4JET, Manual For Installation, Operation And Maintenance, Page: 57 / 162

Assembly and function 72800153 Markoprint XB4JET / XB8JET
Seite 57 von 162 GB
Print head
The ink is distributed in the ink channels through capillary action. Each ink channel
contains a piezo tappet that contracts when an electrical pulse is applied. At the end of
the pulse, the tappet expands suddenly and pushes the ink against the nozzle plate. The
nozzle plate forms the ink into individual drops that are ejected onto the printing surface.
When the drops exit the print head, a suction pressure is generated that pulls more ink
from the ink system.The surface tension of the ink present directly at the nozzles
prevents ingress of air into the ink channels. Please note that the print head must be
protected from strong vibrations. Strong impacts may lead to disruption of the surface
tension and ingress of air into the head.
Ink system
The ink system consists of a cache tank, on which the ink bottle is placed. Furthermore a
pump is mounted. This pump is used exclusively to flush air and any dirt from the head.
The ink gets to the print head by a pull of the used ink only. Only when the system is
fully vented, a reliable ink supply can be ensured.
A return from the print head to the ink tank is used for flushing / venting in the circuit.
Below the nozzle plate of the print head is a suction. For cleaning / venting of the nozzle
plate, some ink is purged from the nozzle and extracted at the bottom through the
suction opening. Therefore a vacuum pump, which is located in the ink system housing,
sucks the dirty ink in a rest container.
If the rest container is full, it will be displayed by a yellow ink and status LED and the
purge function can’t be executed.