Switching the power transmission with the planetary arm in the maintenance unit
When the paper feed motor is driving the maintenance unit, the counterclockwise (when viewed
from the output gear side) rotation meshes the planetary arm with the tube pump; the clockwise
rotation, with the purge cam.
Purge bevel gear
Planetary arm
Tube pump
Purge cam mechanism
The purge cam is so designed that:
- the carriage lock pops out to lock the head/carriage unit before purging and pops in before
cleaning with the head wiper (this lock also secures the head/carriage unit during transportation),
- the pump switching unit switches the application target of the negative pressure generated by the
pump between the head cap for black ink, the one for color ink, the air vent cap, and the opening
tube to the atmospheric air,
- the head wiper comes out to clean the nozzle surface, and
- the air vent rods are pushed up via the slide cams to remove air trapped.
The purge cam switch detects the cam drive positions. (See
Air vent tube
Main drain tube
Black drain tube
Section
3-31
Pump switching unit
Purge cam
Color drain tube
Purge cam switch
Opening tube to
the atmospheric air
(3_08)
3.2.3.)
Confidential