Safety sensors are used to continuously monitor the Intermediate Transfer Member (ITM) drum for
possible presence of media (substrate). When sensors are triggered, printing stops immediately, and the
user must inspect the drum and potentially remove the media prior to continuing print. This
functionality is called “PSTB [Paper Stuck to Blanket] Detection”.
High opacity white ink printing on a cut‐sheet press requires a “One‐Shot” printing process ‐ i.e., all the
colorants are gathered on the ITM drum prior transfer to the substrate. The safety sensors often
mis‐identify the high opacity white ink on the drum as printable media and trigger an immediate stop of
print. Press operation is not allowed until the print Blanket (which is mounted on the ITM drum) is
This invention allows smart muting of the safety sensors in such a way that seamless printing is
allowed while safety measurements are still present.
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INC, HP, "SMART MUTING OF SAFETY SENSORS TO ENABLE WHITE INK PRINTING", Technical Disclosure Commons, (December 26, 2021)