Compensatory means improving the operation of electrostatic prin

Details Compensatory means improving the operation of electrostatic prin Compensatory means improving the operation of electrostatic prin

1979-03-19

1981-09-15

Lucas, Jay P.

Recorders

Electric recording

Electrochemical

3461531, G01D 1516

Patent

active

042900760

ABSTRACT:
For more efficient operation, many serial or line electrostatic printers operate at voltages above ground whether in the print or nonprint mode. The effect of these voltages is to cause the creation of varying current flow in the conductive portion of the recording medium employed in these types of printers. This current flow establishes points of potential and electric fields in the area of the development station of the printer causing the toner medium to deposit onto the surface of the toner dispenser. Toner build up on this surface detrementially provides a source of toner deposit as background or large dark areas on the recording medium. A compensating circuit is provided to sense these potentials and apply a current signal to the recording medium that nullifies the effect of this current flow and eliminate the detrimental depositing or plating out of toner or the toner dispenser surface. The current signal is applied to the conductive portion of the recording medium immediately adjacent to the development station on the upstream side thereof.
Also a compensating circuit is disclosed for reducing the deleterious toner stain effects produced on the recording medium when movement of the medium is stopped.

REFERENCES:
patent: 2932548 (1960-04-01), Nau
patent: 2932690 (1960-04-01), Adams
patent: 3411482 (1968-11-01), Brodie
patent: 3484792 (1969-12-01), Gold
patent: 3631509 (1970-12-01), Marshall
patent: 3717880 (1973-02-01), Howell
patent: 4030106 (1977-06-01), Bestenbreiner

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