Pneumatic charge director dispensing apparatus

Details Pneumatic charge director dispensing apparatus Pneumatic charge director dispensing apparatus

G - Physics

03

G

314/39

G03G 15/10 (2006.01) G01F 11/28 (2006.01) G01F 13/00 (2006.01) G03G 15/02 (2006.01)

Patent

CA 1324184

ABSTRACT OF THE DISCLOSURE The present invention is directed to liquid electrophotographic copying equipment and more particularly to an apparatus to dispense a liquid charge director into a liquid developer reservoir. The apparatus comprises a charge director reservoir including a pressure cell arranged below the liquid level of the charge director reservoir. The pressure cell has a volume to contain a predetermined amount of liquid charge director and is provided with an opening to permit a flow of liquid charge director from the charge director reservoir into the interior of the pressure cell and vice versa. A tubular conduit extends from the interior of the pressure cell to the liquid developer reservoir to provide fluid communication therebetween. A controlled pulse of air is directed into the interior of the pressure cell to force substantially all of the liquid charge director within the pressure cell from the pressure cell, with portions of the liquid charge director flowing through each of the opening of the pressure cell and the tubular conduit. The ratio of the diameter of the opening of the pressure cell to the diameter of the tubular conduit is fixed such that the controlled pulse of air causes a predetermined amount of liquid charge director to flow through the tubular conduit into the liquid developer reservoir and causes the remaining portion of the liquid charge director to flow through the opening of the pressure cell into the charge director reservoir.

576004

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