Browse Prior Art Database

HUMIDITY RESPONSIVE DEVELOPER HOUSING

IP.com Disclosure Number: IPCOM000027442D
Original Publication Date: 1996-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

Developer materials are typically humidity sensitive, and the developer chargeability, At, typically is high at low humidity and low at high humidity. Tonedcarrier combinations provide low sensitivity to humidity. Proposed is a method of providing At control at various humidities. Changing the developer housing speed in response to relative humidity (RH) changes (or other changes), is a way of eliminating At changes and provide improved, more uniform copy quality.

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XEROX DISCLOSURE JOURNAL

HUMIDITY RESPONSIVE DEVELOPER Proposed Classification HOUSING U. S. C1.355/246 Thomas J. Budny Int. C1. G03g 21/00

Developer materials are typically humidity sensitive, and the developer chargeability, At, typically is high at low humidity and low at high humidity. Tonedcarrier combinations provide low sensitivity to humidity. Proposed is a method of providing At control at various humidities. Changing the developer housing speed in response to relative humidity (RH) changes (or other changes), is a way of eliminating At changes and provide improved, more uniform copy quality.

Table 1 shows the-effect in a mixer, such as found in developer housings of revolutions per minute (RPM) on the At of a Xerox Model 5100m developer. It is very easy to increase the At by increasing the RPM. If RH decreases the 4, the housing speed could be increased to compensate for the lower At to maintain a stable developer and vise versa at low RH.

Table 1 At as function RPM-MSG mixer

RPM Dev At

400 122.2

At is also a hction of area coverage, copy run length, aging, etc. It is relatively simple to determine At allocation for these parameters and adjust the developer housing accordingly to maintain optimal At under a variety of conditions including RH. If At drops with age, then adjust speed proportionately upward with age to maintain At.

The overall results of controlling developer housing speed in response to the outside environment would be superior and unifor...