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3.3 Purge Unit
3.3.1 Function of purge unit
The purge unit of the BJC-7100 printer has four caps: two for cleaning and capping,
and two for capping only.
The cap for the ink optimizer head is designed for use with the ink optimizer only so
that the ink optimizer does not get mixed with and react with the ink to block the
nozzles. Maintenance jets and wipers for the ink optimizer head only are also
provided.
1) Capping function
The capping function presses the caps of the purge unit against the face of the print
head to prevent the nozzles drying and the inks leaking.
When the cap is open and the printer is idle (waiting for data), the maintenance jets
are operated at 15 second intervals if paper is being fed. If no data is received for
120 seconds, the nozzles are capped. If no paper is being fed, the maintenance jets
are operated and the nozzles capped after a set time from the last data received. The
actual time depends on the ambient conditions and the number of times ink is
ejected, etc.
The nozzles are also capped when the
POWER
button is used to turn of the power.
2) Cleaning function
The cleaning function cleans the nozzles under the conditions shown below to
maintain the print quality.
In cleaning, paper fragments adhering to the face plate of the print head, ink
residue, and ink optimizer and ink aggregates, are wiped away and the nozzles are
replenished with fresh ink by purging the old ink. In addition, maintenance jets
remove any ink with higher viscosity, air bubbles, mixed inks, and other foreign
objects from inside the nozzles and prevent printing irregularities from unused
nozzles.
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BJC-7100
Part 4: Technical Reference