Chapter 22-232.3.2.5 Purge Unit2.3.2.5.1 Functions of Purge Unit0013-5334To maintain high print quality, the purge unit performs maintenance of the nozzles o the printhead.The purge unit supports a capping function, cleaning function, and ink supply function.a) Capping functionThe capping function presses the cap of the purge unit against the face plate on the nozzle section of the printhead to prevent nozzle drying and dust adhesion.Capping is performed when printing is complete, at the start of the suction operation, and when switching to the standby state due to an error.The capping function also establishes the ink passage between the printhead and purge unit.b) Cleaning functionThe cleaning function restores the printhead to the state where ink can be easily discharged from nozzles. This function includes the following three types of oper-ations.- Wiping operationThis operation is performed to remove paper fibers and dried ink from to the face plate.- Pumping operationThis operation is performed to remove ink from the nozzles and fill the nozzles with fresh ink.- Maintenance jet operationThis operation is performed to spray ink from the nozzles to the cap, borderless ink jet tray, an paper to remove bubbles in the nozzles and dust and other foreignparticles.c) Ink supply functionThe suction pump of the purge unit operates together with the ink supply valve to supply ink to the printhead during the initial filling and ink level adjustment.
