Controlling Ink Supply to the Sub Tanks
The OCFS System
The OCFS (On Carriage Filler Sensor) system monitors the ink level of each ink sub tank in the print
heads. This is a new system that constantly monitors the level of ink during printing and then signals for a
re-fill whenever more ink is needed in one or more of the print heads.
• The main advantage of this system is that the sensors are inside the carriage and move with the
carriage unit. This ensures that the ink level in each tank is constantly monitored.
• Printing does not have to be interrupted to move the carriage to the right to check the ink levels, as
in previous ink jet models.
The OCFS system contains the following parts:
• An actuator arm [1] is attached to a hinge [2] at the rear.
• The center of the actuator is mounted on a weak spring [3] attached to the flexible side of the ink
sub tank.
• When the sub tank is full of ink, the actuator [4] on the end of the actuator arm points straight to the
front and remains in the gap of the OCFS [5].
• The air sensors [6] are a pair of vertical terminals attached to the top of the ink sub tank. These
sensors detect air in the tank.
Ink Supply
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