Ricoh D124, Detailed Descriptions Manual

Page: 109 / 177

Detailed Descriptions 103 D124
5.4.2 CONTROLLING INK SUPPLY DURING PRINTING
The illustration above shows how the actuator moves through gap of the OCFS
(viewed from bottom front)..

As ink is consumed, the side of the tank collapses, and the OCFS actuator moves
through the OCFS sensor gap [1] > [2] > [3].

When the actuator moves out of the gap at [4], the sensor turns off. This signals
low ink. When this occurs, the ink pump motor in the ink supply unit pumps ink to
the tank until the sensor returns to [5].

The motor pumps a prescribed amount of ink ( Wcc ) determined by the machine’s
software to be enough to turn the sensor back on.

After that, the machine continues to pump ink a very short time ( tsec ).

This is the ink full position [6].
5.4.3 AIR DETECTION AND AIR PURGING
The air sensors on top of each ink sub tank check for the presence of air in the tanks.
Air is purged from the tank after it is detected, and then the sub tank is refilled with ink.
The air purge, filling, and full position ‘learning’ sequence is done when one of the
following occurs:

Air is detected in a tank. (The purging and filling is not done until the end of the
job.)

Before print head flushing

When the temperature/humidity sensor detects a change in humidity of more than
15%

When the temperature/humidity sensor detects a change in humidity of more than
30%