Printer systems 27
Printer systems
The Top Cover fans blow air coming from outside of the printer to the ink tubes. This is because during
printing the heat coming from the dryer to keep the paper warm also goes to the ink tubes causing an
increase of the ink temperature leading to short-term damage on the printheads
The pipes that drive the air to the ink tubes are injected plastic parts. There are three different parts that
form two different configuration for each of the SKU’s. One configuration blows the air to the rear and
the other blows it to the rear and to the front. For the 60” SKU, three assemblies blow to the front and rear
and two to the rear, for the 42” SKU, two assemblies blow to the front and rear and two to the rear.
Metal Finger Guard
This is a metal guard designed to protect any fingers that should inadvertently enter into the assembly.
Cables are formed by 4 wires, two supplying the voltage (12V), one providing the PWM (5V=100% of
the voltage) and one containing a fault signal
Dryer IR Sensor & Curing IR Sensor
There are two infrared sensors, one for each module, these sensors detect the temperature and feedback
the information to the Heater Control Assembly (Petisa), the power supplied to each module is then
adjusted according to target levels.
In the following picture a closer view of both sensors can be seen.
The dryer module has a unique resistor, the maximum power level is 2400W(60”) while the curing
module has two separate resistors for a power level of 1900W(60”). Each resistor has two coils for a
better power split and therefore, better flickers performance. The ’Steady’ coil is dimensioned so that it
can provide most of the power requirement, whereas the ’Burst’ coil provides less power to finally adjust
the power level to the servo requirement.
Thermal Switches
Each module has a backup thermal switch, which in the event of an over-temperature, will physically
disconnect the current from the heaters.
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