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Canon W6400 Series Service Manual Page 61

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b) Wipers
The wipers are operated by the purge motor and perform the wiping of six nozzle arrays simultaneously of the printhead. One pairs of wiper blades are
used to provide improved wiping performance. The wiping operation is performed in a "slide wipe" style where the wiper blades slide based on the forward
rotation of the purge motor. This action is performed after the printing or suction operations using a constant-speed movement in the front direction as
viewed from the printer front.
The wiper cam raises the wiper unit to the wiping position. The wiper blade, which is positioned perpendicular to the printhead, wipes the entire face plate
of the printhead, and then the narrow blade is used to wipe the nozzle array.
After wiping, the wiper blades are cleaned before they are set at the wiping position so that maximum wiping performance can be maintained.
In the wiper blade cleaning, ink that was wiped from the head section is rubbed off by an ink scrapping receptacle connected to the maintenance cartridge,
and then the blades are wiped off with a blade cleaner.
c) Pumps
In this printer, tube pumps press on the ink tubes using push rollers to produce negative pressure and enable suction of the ink. Two rollers are used to
press a single tube one after the other to allow flexible control over the ink suction volume.
The rotation timing of the push rollers in the suction pump is detected by the pump home position sensor, and the rotation speed is controlled by the driving
of the pump motor (stepping motor).
Carriage lockpin
Cap
Pump homeposition sensor
Printhead
Ink scrapping receptacle
Blade cleaner
Wipers
Cap sensor
Purge motor
Pump motor
F-2-16
Wiper blade
Cap
F-2-17
Wipers
Chapter 2
2-17

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