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BJC-5000
2.4 Cartridge Automatic Adjustment Function
When the installed printhead is changed, the printer notifies the printer driver of the
new printhead configuration.
The printer driver displays a pop-up message which advises a user to perform the head
alignment before starting the printing. When the maintenance tab on the driver "Align
Printheads" is selected, the printer prints the automatic head alignment pattern and
corrects the print position automatically.
While printing the automatic head alignment pattern, the printer detects run-out of
ink, displacements of the left and right cartridges which could occur due to the dual
cartridge system, and density errors using the auto-alignment sensor on the carriage.
The printer sends the detected information to the printer driver of the host computer.
The printer driver performs an automatic adjustment of the head nozzle alignment and
automatic density correction of the left and right heads based on the information sent
from the printer and controls the printing accordingly. When ink runs out, the
message is displayed on the printer driver.
2.4.1 Automatic correction of head nozzle alignment
The printer driver receives and interprets the information about the correlation
between the print data and head nozzle. With this information, head characteristics
can be corrected by the printer driver. The following adjustments are performed.
a) Alignment of vertical and horizontal directions
When printing is performed with dual cartridges, the auto-alignment sensor detects
the displacement of the dot alignment in the vertical and horizontal directions of
both heads, and the printer driver corrects it.
b) Alignment of printing direction
When bi-directional printing is performed, the print position when the head prints in
the forward direction tends to differ from the print position when the head prints in
the backward direction. This displacement could result in a poor print image. The
printer driver corrects the print position error in the horizontal direction which is
detected by the auto-alignment sensor so that high quality can be maintained, even
during high-speed bi-directional printing.
2.4.2 Automatic density correction of left/right cartridge
When the left and right cartridges are the same, if the auto-alignment sensor of the
printer driver detects a difference in the density during a printing operation between
the left and right cartridges, the printer driver automatically corrects the density
based on the detection result.
If the ink of the right printhead has run out, the printer prints using only the left
printhead.
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Part 4: Technical Reference
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