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Connection of signals 1-23
(3) Notes on welder welding current
The IJ printer operates with its ink particles electrically charged. Therefore, a signal
(weak current) ground and frame ground are connected to it.
+++
+++
Signal ground
Nozzle Column of ink
Charge electrode
Consequently, when a large current (e.g., welder welding current) flows in from the
outside via the frame ground, it also flows to the signal ground and may damage the
printed circuit boards.
Therefore, when conducting welding operations near the IJ printer (there must be no
flame or arc within 5m of the printer), use the following method.
Insulate the main frame of the IJ printer, print head unit, and print target detector body
from the conveyor and earth ground, and provide one-point grounding for the IJ printer
ground terminal only.
When this method is employed, welding operations can be conducted even while the IJ
printer is running.
Method
Primary power
supply cable
Print head unit
Stand (optional)
To be insulated by an insulation
IJ printer main body frame
Welding precautions
E
Ink drops are charged when a voltage is
applied between the charge electrode and
ink column as indicated at left. Therefore,
the ink is always the signal ground.
Further, since the ink is connected to the
frame ground via the circulation path
retainers and the like, it is difficult to
separate the signal ground from the frame
ground.
Principles of charging
WARNING
¡
Keep flames at least 5m away from the machine.
The ink and makeup ink are both flammable. Flames
geherated by welders may cause ignition or fire. Ensure adequate
uentitation in order to not into the fire within 5m of the printer in
printing or no-printing.
In the interest of safety, fumish a dry-chemical fire extinguisher near
the printer.
Summary of Contents for PXR-D
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