Title: Apparatus for controlling developer efficiency

Abstract: Apparatus for controlling developer efficiency in an electrostatic copying machine. A thin film of semi-insulating material is positioned for advancement through a development zone indicative of the quality of a developer system. Positioned in the path of the film and in the vicinity of the development zone are a plurality of conductive members which are coupled to sources of potential having a difference in voltage of approximately 200 to 600 volts in one embodiment. The difference in potential cause the development along the semi-insulating film material where the electrostatic fields are greatest. The film is then advanced past a detection station which includes an optical sensing device for sensing the transmission of the film and supplying signals indicative of the transmission characteristics to a control circuit which controls the toner dispensing in the developer system. In an alternative embodiment three conductive members may be used in place of the two conductive members with the middle conductive member being at one electric potential and the outer conductive member being at a second potential.

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Inventors: Gundlach, Robert W. (Victor, NY, US)

Application Number: 442292
Filing Date: 1974-02-13
Publication_date: 1976-03-02
Assignee: Xerox Corporation (Stamford, CT)
Primary Class(es): 222/52 222/DIG1
Other Classes:
US Patent Ref:

3066298	Nov, 1962	McNaney	355/16.
3094049	Jun, 1963	Snelling	355/3.
3533692	Oct, 1970	Blanchette et al.	355/16.
3553464	Jan, 1971	Abe	250/325.
3682538	Aug, 1972	Cade et al.	355/3.
3776630	Dec, 1973	Ohno et al.	355/16.
3777173	Dec, 1973	Landrith	222/DIG.
3778841	Dec, 1973	Gundlach et al.	355/16.
3797926	Mar, 1974	Fotland et al.	355/16.
3834809	Sep, 1974	Yoshizawa et al.	355/3.

Other Refs:
Primary Examiner: Reeves, Robert B.
Assistant Examiner: Marmor, Charles A.
Attorney: