Canon BJC 50 Service Manual - Page 116

Part 4: Technical Reference BJC-50 3.3 Purge Section Structure 3.3.1 Configuration Cap Wiper Paper Feed W-gear Trigger Gear Paper Feed Gear Pump Gear Pump Arm Cylinder Gear Pump Piston Shaft Waste Ink Absorber Figure 4-21 Purge Section Structure a) Cap section When the carriage is at the home position, the cap is pressed against the print head faceplate to cap the head. The rubber cap connects to the pump, and ink is sucked from the head by the pump during cleaning. The sucked ink is absorbed by the ink absorber in the pump and finally collected in the waste-ink absorber. The cap is moved by the p pump arm, which is driven by the pump gear. Therefore, the b) Wiper section The wiper wipes excess ink off the print head faceplate when the carriage moves from left to right. The wiper is moved up or down by the projections on the carriage. The ink attached to the wiper is removed by the aluminum plate on the head. Moreover when the wiper comes down, the ink remaining on it is splashed on the pump gear. c) Pump section The pump contains a rubber piston, whose piston shaft is linked with the cylinder gear. The cylinder gear is rotated by the pump gear. Then the pump is opened to absorb the ink collected in the cap into the waste ink absorber. The ink in the cap flows into the absorber in the pump, and then into the waste ink absorber. d) Waste ink absorber The ink sucked from the cap and the ink collected in the pump are sucked into the absorber in the pump, and absorbed into the waste-ink absorber. 4-28