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AUTOMATIC HIGH AND LOW LIMIT TONER DISPENSER CONTROL

IP.com Disclosure Number: IPCOM000024557D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 71K

Publishing Venue

Xerox Disclosure Journal

Abstract

In controling the toner concentration of a two-component developer material in a xerographic copier, it is known that an electrical control signal which is proportional to the toner concentration can be generated by allowing developer to flow between a pair of conductive transparent plates to which a DC potential has been applied and monitoring the light transmitted between the plates using a photocell. It is also known that this signal may be used to control the operation of the toner disperser which adds toner powder to the developer material. An improved method for controling the operation of a toner dispenser using signals from this type of sensing device is described in this disclosure.

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KEROX DISCLOSURE JOURNAL

AUTOMATIC HIGH AND LOW LIMIT TONER DISPENSER CONTROL Peter M. Tolliver

Proposed Classification
U.S. C1. 427/145 Int. Cl. B41m 5/16

In controling the toner concentration of a two-component developer material in a xerographic copier, it is known that an electrical control signal which is proportional to the toner concentration can be generated by allowing developer to flow between a pair of conductive transparent plates to which a DC potential has been applied and monitoring the light transmitted between the plates using a photocell. It is also known that this signal may be used to control the operation of the toner disperser which adds toner powder to the developer material. An improved method for controling the operation of a toner dispenser using signals from this type of sensing device is described in this disclosure.

Five predetermined levels of toner concentration are selected, the third of which represents the normal or reference level of operation. These levels are designated as follows:

1. Low limit emergency
2. Low limit
3. Reference level
4. High limit
5. High limit disconnect

By means of comparators which sense the relationship of the toner concentration signal to the fixed levels, the following modes of operation can be activated by a pp ro p ri at e electronic circuit s:

At Level 5: The toner dispenser motor is stopped, shutting off additional toner addition to an over-toner developer.

At or Above Level 4:

Between Levels 3 and...