Canon W2200 Service Manual page 60

Part 3 Technical Reference
6. PRINTER'S MECHANICAL PARTS
6.1 Carriage Section
The carriage holds one print head in place. The carriage belt driven by the carriage motor
moves the carriage horizontally back and forth across the media.
As for the carriage position control, the initial position is detected when the carriage hits the
chassis of the purge unit. After that, the carriage position is detected by reading the pulse
from the carriage encoder film.
6.2 Purge Section
There are two motors in the purge unit section. Each motor is controlled by the motor drive IC
and performs pumping operation and capping. In the purge unit, the large motor moves the
pump and small motor moves the caps and the wiper.
There are two caps and each is divided into three colors. To avoid mixing inks of each nozzle
within the cap, the suction pressure is controlled by the air-through valve and the cap releasing
mechanism.
Yellow, Magenta and PhotoMagenta (3 colors): cap on the left
Black, PhotoCyan and Cyan (3 colors): cap on the right
6.3 Paper Feed Section
The pickup roller contacts the back of print media, and using the pickup roller, the leading edge
of media is pulled up until it reaches the U-turn roller. When the leading edge of media is
caught into the pinch roller, due to the rotation of the LF roller and the pinch roller, media is fed
till the print starting position. The optical encoder film is attached on the LF roller. The LF
roller is driven by the DC motor through the gear and the belt, and is controlled according to
the signal read from the film. The minimum media feeding amount is 1/2400 inch.
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W2200