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Part 4: Technical Reference
3.3.2 Construction of the purge unit
Wiper Release Unit
Air Valve Unit
a) Purge drive gear
Receives the power of the feed roller driven by the paper feed motor via the drive
switching unit to drive the pump. The pump roller's position is detected by the
pump sensor.
b) Wiper unit
Operates when the carriage travels back and forth. It wipes off surplus ink from the
head face plate as the carriage moves right to left at the completion of cleaning. It is
constructed of two rubber wipers to enhance wiping performance,.
c) Cap unit
Uses the same rubber cap for both the capping action to protect the head, and for
the pumping action to suck ink. There are two rubber caps, one per BJ cartridge
installed on the carriage. Capping occurs by pressing the cap against the head's
face plate when the carriage moves to the capping position. The rubber caps in the
cap unit are connected to the pump unit and the air valve via the ink tube. During
cleaning, the unit sucks ink from the head using the pump. The sucked ink will be
sent to the waste ink absorber. After ink suction is completed, the carriage will be
moved to the position that opens the air valve and pumping will be performed to
suck out waste ink collected in the rubber cap.
Cap Unit
Figure 4-20 Purge Unit
Wiper Unit
Carriage Lock Unit
Purge Drive Gear
4-26
BJC-6000
Pump Unit
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