The procedure herein disclosed allows the printer to automatically detect with high precision the
point where a non‐rigid moving element (for example, the wiper such as a rubber wipe or a web
wipe subsystem) starts interfering with the nozzle plate as to ensure that the force applied during
the wiping routines stays at the optimal value, avoiding disturbances coming from:
‐ The geometric tolerances of the machine and subsystems. These tolerances cause that the
machines have different distances between the wiper subsystems and the nozzle plate in
each particular machine and wiper.
‐ The geometric tolerances of the consumable. Bare rubber wipes are frequently replaced due
to wear and every consumable has some deviation in their datum‐to‐rubber‐tip distance.
‐ The wear of the rubber part. Vertical position of the tip changes with use (specially in the
bare rubber wipers), so it is important to position the wiper taking this change into account.
The above‐mentioned high precision is necessary to avoid image quality problems that can come
from excessive wiping force (streakiness or ink drops) or from insufficient wiping force (crusting).
The procedure compares the free movement of the motor that is responsible for the vertical
positioning of the wiper with its movement when the carriage is positioned above. An algorithm
compares read position, voltage input and its derivative for the two cases (with several repetitions
for each case), filters the data and is able to predict with high accuracy where the beginning of the
interference between the wiper and the nozzle plate is taking place.
This procedure will be applied at the beginning of the life of each consumable and automatically
throughout its use in the machine, with some regularity.
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INC, HP, "AUTOMATIC CALIBRATION OF WIPERS TO ENSURE THAT AN OPTIMAL FORCE IS APPLIED TO THE PRINTHEADS", Technical Disclosure Commons, (September 20, 2019)