TONER CONCENTRATION SENSOR
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
As shown in the drawing, developer roller 10 is mounted rotatably in housing 12 which stores a supply of electrically conductive developer material 14 therein. Voltage source 16 electrically biases developer roller 10. A cylindrical member 18 having a plurality of spaced vanes extending outwardly therefrom transports the developer material 14 to developer roller 10 from the sump of housing 12. Metering blade 20 regulates the quantity of developer material being advanced into contact with the electrostatic latent image recorded on the photoconductive surface. Metering blade 20 is made from an electrically conductive material and connected to a potentiometer 22. Lamp 24 is also connected to potentiometer 22. By selecting the proper lamp and potentiometer, the lamp will glow brightly if the toner concentration decreases by .5 percent and will extinguish if the toner concentration increases by .5 percent from the predetermined set point. In this way, the key operator can readily control the addition of toner particles to the development system.