The 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.

2.3.2.5.2 Structure of Purge Unit

a) Cap unit

The cap unit is used to cap the print head nozzles during capping and cleaning. The portion that touches the face plate is made from rubber. Two left caps are ar-

ranged for the printhead (six arrays of nozzles) installed in the carriage.

During cleaning, the caps used for both suction and capping are used to suck ink from the printhead using the suction pump.

Each of the right caps is used to cap the six arrays of nozzles.

This cap is used only for capping.

During capping, the caps are raised by the cap cams operated by the purge motor to cover the arrays when the carriage has moved to the home position, thus pro-

tecting the nozzles.

2-14

Between scan operations during

scanning

After printing exceeding the prescribed

dot count

Each time 120 minutes have elapsed in

the cap open status

Manual cleaning (head cleaning A)

Manual cleaning (head cleaning B)

After replacement of head

After the power is turned on during