Browse Prior Art Database

ADC SEQUENCE AND SPECIAL FEATURES

IP.com Disclosure Number: IPCOM000024739D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 83K

Publishing Venue

Xerox Disclosure Journal

Abstract

An automatic development control system is disclosed using the ratio of a test target voltage to a clean drum voltage to generate an error signal. The error signal is then compared to a control band which is set by the technical repre-sentative. If the error signal is within the control band, a nominal toner dispenser rate is chosen. If the error signal is outside the control band a fast toner dispenser rate or zero dispenser rate is selected.

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XEROX DISCLOSURE JOURNAL

ADC SEQUENCE AND SPECIAL FEATURES Proposed Donald J. Weikel, Jr. Classification

US. C1. 222/52 Int. Cl. B67d 5/08

An automatic development control system is disclosed using the ratio of a test target voltage to a clean drum voltage to generate an error signal. The error signal is then compared to a control band which is set by the technical repre- sentative. If the error signal is within the control band, a nominal toner dispenser rate is chosen. If the error signal is outside the control band a fast toner dispenser rate or zero dispenser rate is selected.

It is desirable to frequently measure and store the clean drum voltage to correct for sensor contamination and changes in sensor temperature. By definition the clean drum voltage must be measured when no toner is on the drum. A convenient time to measure the clean drum voltage is at the start of a copy cycle after a normal cycle. This is because during normal cycle out, the developer is off and the drum cleaning is taking place. Therefore, at startup there is a clean drum over the sensor and the contamination and machine temperature can be corrected for. However, if the start of a copy cycle is after a jam shut down, no sample can be taken as a dirty drum may be over the sensor. In this case the bare drum signal stored during the previous normal cycle will continue to be used.

Another feature is to force the nominal dispensing rate if the clean drum voltage is too small due to contamina...