Browse Prior Art Database

ADAPTIVE TRANSFER/DETACK IN XEROGRAPHIC DEVICES

IP.com Disclosure Number: IPCOM000027219D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 143K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is highly desirable to provide reliable products at a competitive cost. One means of satisfying such dual requirements is through the use of information which is independently available to drive intelligent control schemes. Intelligent control schemes can sometimes be used to offset the demand for inherent latitude in a subsystem by providing the means to adjust the subsystem setpoint in response to the actual input conditions.

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XEROX DISCLOSURE JOURNAL

ADAPTIVE TRANSFER/DETACK Proposed Classification IN XEROGRAPHIC DEVICES U.S. C1.355/219 Robert P. Siege1
Int. Kenneth W. Pietrowski C1. G03g 15/02

It is highly desirable to provide reliable products at a competitive cost. One means of satisfying such dual requirements is through the use of information which is independently available to drive intelligent control schemes. Intelligent control schemes can sometimes be used to offset the demand for inherent latitude in a subsystem by providing the means to adjust the subsystem setpoint in response to the actual input conditions.

One possible example is the transfeddetack systems found in xerographic engines. The design challenge in a transfer system is to electrostatically tack paper to the photoreceptor while providing sufficient transfer current (hence field) to effectively transfer the toner image from the P/R to the paper under all conditions. Higher tacking forces may be required with heavier weight papers, but the corresponding transfer field levels remain significantly less than those needed for good toner transfer. This results from the fact that the electrostatic tacking pressure is function proportional to the square of the field. The choice of a nominal transfer current setpoint is usually a compromise attempting to obtain good tacking and transfer performance for a wide variety of substrates. This often results in unnecessarily high tacking forces that are difficult to overcome when stripping lower beam strength lighter weight papers. If the substrate weight could be detected then the transfer and detack current setpoints could be optimized through the use of a control algorithm.

Proposed here is a set of electrostatic field control algorithms which would vary the current for both the transfer and detack devices in response to the detected paper basis weight. In the algorithms the following overall pattern is incorporated:

Paper Weight Transfer Detack

Light

or Light

Low Low (proportional to transfer percent change)

Nominal High (lead edge),

Nominal (substrate body)

Medium - Heavy Nominal Nominal

XEROX DISCLOSURE JOURNAL. Vol. 20 No. 5 September/October 1995 439

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ADAPTIVE TRANSFER/DETACK IN XEROGRAPHIC DEVICES

(Cont'd)

Lighter weight papers are also subject to physical damage (deformation) when passed through fusers, often a consequence of differential cooling as the paper contacts baffles, paper guides etc. When dup...