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Browse Prior Art Database

Toner Concentration Check

IP.com Disclosure Number: IPCOM000085771D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cecil, TF: AUTHOR [+3]

Abstract

It is usual practice to check the toner concentration of a xerographic copier by running an "all-black" copy, and then comparing this copy sheet to a test specimen supplied by the copier manufacturer.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 85% of the total text.

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Toner Concentration Check

It is usual practice to check the toner concentration of a xerographic copier by running an "all-black" copy, and then comparing this copy sheet to a test specimen supplied by the copier manufacturer.

Toner concentration can be maintained by an open-loop controlled dispenser which dispenses a fixed amount of toner to the developer for each copy, or it can be maintained by a closed-loop controlled dispenser which includes a sensor operating to originate a signal indicative of actual toner concentration, and thereby automatically and variably controlling the dispensing of toner so as to maintain a preset reference concentration.

With the closed-loop system particularly, it is important to not only control the mean concentration, but to also control the range of concentration excursions about this mean.

If two test specimens are provided, one representing the lightest permissible excursion from the mean, and the other representing the darkest permissible excursion, the above-mentioned all-black copy can be compared to these two specimens to check that toner concentration is being maintained within this range. In this manner, manual adjustment can be made to the preset reference mean, if necessary. When initially adjusting the toner concentration system, these two test specimens will define a relatively narrow range of blackness for the all-black copies. The reference mean is set to a value which results in a test copy approximately in the m...