Canon BJC-2000 Series Service Manual - Page 86
Purge Unit, Purge unit structure
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Part 4: Technical Reference BJC-2000 3.3.2 Purge unit structure 1) Purge drive gear Through a transmission gear, the purge drive gear is driven by the feed roller which is driven by the paper feed motor. The purge drive gear in turn drives the cam which controls the pump's operation. The cam's position is detected by the home position sensor via the sensor arm. 2) Wiper unit When the carriage moves from left to right, the wiper retracts so that it does not touch the head. However, when the carriage moves from right to left, the wiper wipes ink from the BJ cartridge's face plate at the following times: Once every 60 seconds (or when the specified dot count is reached) during printing, when the paper pick-up operation ends, when the recovery operation ends, and when the cap is opened or closed. 3) Capping unit The capping unit has a rubber cap. When the carriage moves to the home position, the cap is pressed against the print head's face plate. Also, since the cap is connected to a pump, the cap sucks ink from the BJ cartridge during the cleaning operation. The ink which has been sucked out is sent to the base cover unit's waste ink absorber. 4) Maintenance jet receiving section The maintenance jet receiving section takes in ink (for test ejection to maintain the nozzles' working condition) ejected from the BJ cartridge. The ink is received, and when a gear is rotated, the ink is sent to the waste ink absorber below. 5) Slide lock pin The slide lock pin moves the cap when the carriage moves from left to right and reaches the capping position after moving from left to right. Capping is executed while the slide arm is unlocked. When the slide arm is unlocked, the rotation of the feed roller is transmitted to the purge drive gear and sheet feeder. 6) Ink shield The ink shield stops ink splattering when the wiper unit wipes off ink. Slide Lock Pin Wiper Unit Purge Unit Drive Gear Capping Unit Ink Shield Maintenance Jet Receiving Section Figure 4-14 Purge Unit 4-18