Problems Caused by Wiper Height — Mechanical Issues (EP.5) ARTJET 2026

All other operations are working fine.

But pressing the Cleaning button triggers the following message:

“The collision switch has been triggered. Please check the print platform for troubleshooting and then click OK to reset!”

Here is a more detailed explanation of what this error message means:

• The head collision protection switch has been activated. Check whether any substrate on the flatbed is pressing against the switch.
• If something is pressing it, remove the substrate and confirm that the switch has returned to its resting (down) position.
• If everything looks fine, click [OK] to reset the machine.

In addition, ink is flowing onto the flatbed as follows:

• Color ink is dripping onto the flatbed surface,
• and White ink is being sprayed before the flatbed start point.

Understanding the cleaning sequence helps identify what went wrong. When you press [Clean] in the software, the cycle runs in three main stages.

① Extracting ink from the head

• The Capping station lowers, and the head carriage touches the home position before returning to the Captop location.
• The Capping station rises again, sealing the Print head with the Captop.
• With the head sealed, the Peristaltic pump motor runs twice — drawing ink out of the Print head.
• The remaining ink in the Captop is then drained into the waste ink tank.

② Wiping the head surface

• Because ink has been forcibly extracted, ink droplets remain on the head surface.
• The head carriage moves back and forth, pausing at each head’s wiper position. The wiper advances and retracts, wiping each Print head in turn.

③ Spit (self-jetting)

• Once wiping is complete, the head carriage moves to the far left of the X-axis and jets ink onto a white cloth.
• This is a purge action — firing ink through the nozzles to improve jetting condition.
• After this, the carriage returns to the X-axis home position, the Captop rises to seal the head, and the cleaning cycle is complete.

Important note: this issue only occurs with the older white wiper. The current black wiper does not cause this problem.

Here is what causes the problem.

• To wipe the head surface, the wiper advances forward and must retract back to its home position.
• But if the wiper is too tall, it scrapes heavily against the entire underside of the head carriage as it moves, creating resistance.
• Due to this resistance, the wiper fails to return to its home position and stops at an unintended location.
• When the head carriage then moves sideways for the next action, the oversized wiper contacts the head collision protection switch mounted under the carriage.

• Once the collision protection switch activates, the head carriage stops immediately at that position (see photo below).

• The carriage should move to the far left for the Spit action, but the X-axis stop command is applied immediately — halting it at the current position.
• Since the Spit command has already been sent, the Spit action executes at the stopped position.
• As a result, Color ink is sprayed onto the flatbed and White ink is sprayed just before the flatbed start point — exactly as shown in the symptom photo.

For the older white wiper: trim it down with a blade and reassemble. If your wiper is already black, this section does not apply to you.

⚠️ Important: How to release a stuck collision switch

• Occasionally, the head collision protection switch fails to release after being triggered.
• When this happens, manually touch the switch a few times and confirm it has returned to its resting position.
• How to release the collision switch when it keeps activating and the software becomes unresponsive (video)