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Browse Prior Art Database

PHOTORECEPTOR MISSTRIP DETECTION

IP.com Disclosure Number: IPCOM000025002D
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 63K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, a powder image is formed on a photoconductive belt. The copy sheet is advanced into contact with the powder image at the transfer station. The powder image is transferred to the copy sheet and the copy sheet separated from the photoconductive belt. If the copy sheet fails to separate from the photoconductive belt, it may advance therewith into the cleaning station. This can result in a catastrophic failure within the printing machine. Thus, it is necessary to automatically shut-down the printing machine prior to the copy sheet being advanced into the cleaning system. To this end, it is necessary to detect the presence of the copy sheet on the photoconductive belt. Frequently, a pre-clean corona generating device is employed in the printing machine. This pre-clean corona generating device pre-conditions the residual particles on the photoconductive member to facilitate their removal therefrom. Preferably, this pre-clean corona generating device is a dicorotron. This dicoro-tron is self-compensating, and automatically adjusts the current as local conditions change. The presence of a sheet of copy paper under the pre-clean dicorotron will result in a sudden change in the current/shield voJtage. Inasmuch as the copy paper is never under the pre-clean dicorotron unless it fails to separate from the photoconductive surface at the transfer station, the current change corresponds to a misstrip. This current is monitored by the machine logic and the system automatically shuts down the printing machine when such a condition occurs.

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IEROX DISCLOSURE JOURNAL

PHOTORECEPTOR MISSTRIP DETECTION Proposed Classification
E. B. Franko U.S. c1. 355/3 Int. CI. G03g 15/00

In an electrophotographic printing machine, a powder image is formed on a photoconductive belt. The copy sheet is advanced into contact with the powder image at the transfer station. The powder image is transferred to the copy sheet and the copy sheet separated from the photoconductive belt. If the copy sheet fails to separate from the photoconductive belt, it may advance therewith into the cleaning station. This can result in a catastrophic failure within the printing machine. Thus, it is necessary to automatically shut-down the printing machine prior to the copy sheet being advanced into the cleaning system. To this end, it is necessary to detect the presence of the copy sheet on the photoconductive belt. Frequently, a pre-clean corona generating device is employed in the printing machine. This pre-clean corona generating device pre-conditions the residual particles on the photoconductive member to facilitate their removal therefrom. Preferably, this pre-clean corona generating device is a dicorotron. This dicoro- tron is self-compensating, and automatically adjusts the current as local conditions change. The presence of a sheet of copy paper under the pre-clean dicorotron will result in a sudden change in the current/shield voJtage. Inasmuch as the copy paper is never under the pre-clean dicorotron unless it fails to separate from t...