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A PHASE SENSITIVE DEVELOPABILITY CONTROL SYSTEM

IP.com Disclosure Number: IPCOM000024110D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 189K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, toner particles are depleted from the developer mixture as copies are made. Hence, it is necessary to periodically furnish additional toner particles to the developer mixture. The concentration of toner particles within the developer mixture is measured to determine when it is

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XEROX DISCLOSURE JOURNAL

A PHASE SENSITIVE DEVELOPABILITY

CONTROL SYSTEM I, Blankson
T. G. Davis

Proposed Classification
U.S. Cl, 118/646

mt. CI. G03g 15/06

In an electrophotographic printing machine, toner particles are depleted from the

developer mixture as copies are made. Hence, it is necessary to periodically furnish additional toner particles to the developer mixture. The concentration of toner particles within the developer mixture is measured to determine when it is

beneath a desired level. At this time additional toner particles are added to the developer mixture to return the concentration to the desired level. As shown in the drawing, a DC signal is developed which is proportional to the mass of toner particles developed on the NESA (electrically conductive) glass sensor. This is

accomplished by producing an output signal from an active photocell of the sensor system which has both AC and DC components. The outputs from the sensor is fed along with a pure AC signal to a four-quadrant multiplier. The resulting signal is then averaged to obtain a suitable control signal to operate the toner dispenser.

FOUR- QUADRANT

MULTIPLIER AVERAGING

V

0

Volume 4 Number 5 September/October 1979 579

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