●Connection of signals 1-23
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(3) Precautions related to welding current of welder
Signal (weak electric) ground and frame ground are connected because the ink drops
of the IJ printer are electrically charged.
The ink drops are electrically charged by
impressing a voltage between the charging
electrode and ink column as shown at the
left.
Therefore, the ink always becomes signal
ground.
In addition, since the ink is always
connected to frame ground by the clamp,
etc. of the circulation path, separating signal
ground and frame ground is difficult.
Nozzle
Signal ground
Charge electrode
Column
of ink
Principles of charging
Therefore, when a large current (for example, the welding current of a welder) flows
from the outside through frame ground, the current is also diverted to signal ground
and the PC boards may be damaged. For this reason, when performing welding work
near the IJ printer, proceed as follows:
Method
Be sure to insulate the printhead and IJ printer frame to keep the welding current
from flowing to the control section of the printer, and to make a separate ground
connection for the printer.
If this method is used, welding work becomes possible even while the IJ printer is
operating.
IJ printer main body frame
Primary power
supply cable
Print head unit
Stand (optional)
To be insulated by an insulation
Welding precautions
● Fire is strictly forbidden around the IJ printer
The ink and makeup are both flammable. Welding sparks
may cause ignition or a fire. Take measures so that sparks
do not enter the surrounding area whether or not the IJ
printer is operating, and ventilate sufficiently.
Just in case, ensure safety by installing a powder type fire
extinguisher nearby.
WARNING
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