Nitrogen argon mixtures supplied to midax printers

Details Nitrogen argon mixtures supplied to midax printers Nitrogen argon mixtures supplied to midax printers

1990-05-31

1992-04-21

Miller, Jr., George H.

Recorders

Electric recording

Electrochemical

346154, G01D 1506

Patent

active

051072840

ABSTRACT:
A method and apparatus provide enhanced longevity of the ion cartridge in an MIDAX (silent electric discharge) electrostatic imaging processing system. The conventional ion cartridge comprises a solid dielectric with driver and control electrodes on opposite sides, the second electrode defining a discharge region at the junction of the edge surface of the solid dielectric member. Alternating current is supplied to the electrodes to induce charged particle production electrical discharges. Gas is supplied to the discharge region to replace the vast majority of the air during charge particle generation. The gas is a mixture consisting essentially of nitrogen with an amount of argon, neon, xeon, or krypton effective to provide a catalyst for nitrogen ionization while preventing arcing. Typically, the gas is a mixture of nitrogen and argon in a ratio of about 5 to 1 to about 20 to 1 (e.g. about 10 to 1), with the total gas flow rate to the discharge region about 4.75-6.25 cubic feet per hour. The gas is supplied to the area between the ion cartridge and an imaging drum by a pair of gas manifolds at opposite ends of the drum, and a pair of spray tubes having numerous perforations along their length extending between the gas manifolds. Regulators precisely control the amount of nitrogen and argon supplied to the gas manifolds.

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