Method and apparatus for drum corona current measurement and ali

Details Method and apparatus for drum corona current measurement and ali Method and apparatus for drum corona current measurement and ali

1978-04-03

1980-02-19

Dixon, Harold A.

Radiant energy

Corona irradiation

2503152, H01T 1904

Patent

active

041896424

ABSTRACT:
Method and apparatus for enabling measurement of corona drum current in an electrostatic copier as a maintenance aid. A rotatable drum supports a photoconductor with a conductive backing connected to a ground current return path including a slip ring. In the maintenance mode, the ground path is opened allowing drum current to flow through a current measuring circuit including a pair of jacks to which a measurement device may be connected. The current measuring circuit also develops a potential which is representative of whether or not the current return path is grounded. This potential is coupled to a monitoring device where it may be used to drive a display. A method of aligning a corona generator employing the corona current measuring apparatus of the invention is applicable for aligning corona generators in situ in an electrostatic copier. The alignment method includes steps of energizing a selected corona generator, interrupting the normal ground return path, providing a current path from the photoconductor and coupling the current path to a measurement device. For alignment purposes, at least two measurements are made, each measurement is made while different portions of the corona generator are masked. The measurements provide a measure of the corona current generated by two different portions of the generator which is useful in aligning the generator.

REFERENCES:
patent: 3699388 (1972-10-01), Ukai
patent: 3961193 (1976-06-01), Hudson

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