The device consists of the stirring gear which rotates at a constant rate, the stirring bar and the magnet on the stirring bar. The stirring bar rotates through the link
on the protrusion in the stirring gear.
The configuration of stirring bar in the figure below may differ. The principle of toner detection, however, remains the same.
l
Operation
Toner Low is detected by monitoring the time interval of the encounter of the magnet set on the sensor plate and the magnet on the stirring bar.