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Toner-concentration-sensing-using-auger-mounted-magnet

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Toner concentration sensing using auger mounted magnet

Details

Inventors: Nichols, Stephen J.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Grimley; A. T.
Assistant Examiner: Ramirez; Nestor R.
Attorney, Agent or Firm: Oliff & Berridge

A toner concentration sensing system is disclosed for controlling the dispensing of toner into a developer sump. A toner concentration sensor is located in the bottom of the mixing area of the developer sump adjacent one of the mixing augers. The toner concentration sensor can be positioned flush with the bottom of the mixing chamber or the sensor can project slightly from the bottom of the chamber. A magnet is positioned on the rotating mixing auger for rotating with the auger past the toner concentration sensor. As the auger rotates, the magnet with developer material adhering thereto, sweeps the top of the toner sensor to improve the accuracy of the toner concentration readings. A toner dispenser is actuated when the detected toner concentration goes below a predetermined limit.

DETAILED DESCRIPTION It is an object of the present invention to provide a toner dispenser control with decreased response time and improved accuracy.
It is another object of the present invention to provide a sensor for sensing the concentration of toner particles in the developer sump adjacent one of the mixing augers in the developer sump.
It is still another object of the present invention to provide a toner concentration sensor immediately adjacent a mixing auger having a magnet thereon for detecting toner concentration as the toner moves past the sensor due to the rotation of the auger.
It is yet another object of the present invention to provide a sensor below a mixing auger, the sensor projecting toward the blade of the auger, the auger having a magnet mounted above the sensor for rotation past the sensor.
These and other objects of the present invention are achieved by a developer mechanism and method for determining a concentration of toner particles within a two-component development machine in which two-component developer material comprises the toner particles and carrier granules in a reservoir, the toner particles being selectively attracted to a charged receptor surface.
The developer material in the reservoir is mixed by the rotation of at least one auger within the reservoir.
An amount of toner particles is sensed in the reservoir with a sensor mounted below one auger, and a magnet is mounted on the auger for rotation therewith, the sensor being positioned within a magnetic field of the magnet when the magnet faces the sensor.
The surface of the sensor is brushed with a developer brush to remove agglomerated developer material thereon, the developer brush comprising developer material magnetically adhering to the magnet mounted on the auger.
Because of the tendency of developer material to clump on the surface of the sensor, the signal sensed by the sensor can be inaccurate.
By utilizing a brush of developer materials adhering to the rotating magnet, the surface of the sensor is brushed clean at each rotation of the auger to improve the accuracy of the sensed toner concentration

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