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BJC-5000
3.3.2 Purge unit structure
1) Purge drive gear
The feed roller driven by the paper feed motor operates the purge drive gear via the
transmission gear. The purge drive gear in turn operates the cam which controls
capping. The position of the cam is transmitted by the purge sensor flag and
detected by the purge sensor.
2) Wiper unit
When the carriage moves from left to right, the wiper unit retracts to a position
where it does not come in contact with the head. When the carriage moves from
right to left, however, the wiper unit wipes ink from the BJ cartridge faceplate under
the following conditions: 1) when the printer is turned on and off, 2) once every 60
seconds (or after discharging more than the designated number of dots) during
printing, 3) after the paper feed operation, 4) after a cleaning operation, and 5)
when the cap is opened or closed.
3) Capping unit
The purge unit of this printer is equipped with two caps: the left cap which performs
both ink absorption and capping, and the right cap which is used exclusively for
capping.
After the carriage moves to the capping position, the capping unit presses the cap of
the purge unit against the face of the printhead to cap the printhead when the purge
drive gear is driven.
The left cap is equipped with a waste ink tube and sucks ink from the BJ cartridge
during cleaning by means of a pumping operation. The sucked ink is sent to the
waste ink absorber of the base unit. After ink is sucked, the carriage is moved to
the left from the capping position and the pumping operation is performed again to
discharge the waste ink accumulated in the rubber cap and waste ink tube to waste
ink absorbers.
4) Maintenance jet receiving section
The maintenance jet receiving section takes in ink (for test discharge to maintain the
nozzles' working condition) discharged from the BJ cartridge.
5) Pump unit
This unit features a tube pump system which sucks ink by using a rotational roller
to apply pressure to the waste ink tube and thus generating negative pressure. The
waste ink tube is connected to the left cap only.
6) Slide lock pin
The slide lock pin is interlocked with the transmission arm and switches the motor
of the paper feed motor.
When the carriage moves farther right from the home position, the hook provided at
the back of the carriage slides the slide lock pin toward the right to unlock the
transmission arm.
The use of the transmission gear motor is switched between the purge drive or sheet
feeder drive depending on the direction of rotation of the paper feed motor when the
transmission arm is unlocked.
7) Carriage lock pin
The carriage lock pin is assembled with the capping unit in a single unit. It fixes the
carriage from the underside so that the carriage does not move toward either side
from the capping position when the cap is pressed against the BJ cartridge face.
4-27
Part 4: Technical Reference
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