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AUGER FAILURE DETECTION

IP.com Disclosure Number: IPCOM000025359D
Original Publication Date: 1984-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 99K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, toner particles are cleaned from the photoconductive surface after transfer of the toner powder image to the copy sheet. These residual or waste toner particles are removed from the photocon-ductive surface by a cleaning unit and transported to a waste toner storage area by an auger spring in a tube. Generally, the auger spring is metal with the tube being plastic. If there is a heavy overload of toner particles in the tube, then the auger spring tends to compress to a shorter length. If the overload exceeds the acceptable stress levels, the auger may fail. Alternatively, if the auger does not fail, the drive motor may fail. Under these latter circumstances, toner particles are trapped in the cleaning unit and large quantities of waste toner particles build up. Thus, it is highly desirable to prevent the foregoing from occurring. As shown in Figure 1, a proximity sensor is positioned in the wall of tube 12. Metal auger spring 14 rotates to transport toner waste particles through tube 12. As shown, waste toner particles move in the direction of arrow 16 and fall from the end 18 of tube 12 into a waste toner storage area. Under normal operating conditions, as shown in Figure 1, the proximity sensor can develop an output signal which is a wave? the shape depending upon the characteristics of the sensor, the auger spring, the speed of auger rotation, and the distance from the sensor to the spring. In general, proximity sensor 10 will produce a wave shaped output.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

AUGER FAILURE DETECTION
Proposed A. F. McCarroll Classification

U.S. c1. 355/3 Int. CI. G03g 15/00

PROXIMITY SENS

PLASTIC AUGER TUB

METAL AUGER SPRING ROTATES ?; TO PUSH TONER THROUGH TUBE 'F.

AUGER SPRING COMPRESSED BY OVERLOAD

t I I

 TONR NG INTO RAGE AREA

.. .

.I

-

.. .

I2

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Page 2 of 2

AUGER FAILURE DETECTION (Cont'd)

In an electrophotographic printing machine, toner particles are cleaned from the photoconductive surface after transfer of the toner powder image to the copy sheet. These residual or waste toner particles are removed from the photocon- ductive surface by a cleaning unit and transported to a waste toner storage area by an auger spring in a tube. Generally, the auger spring is metal with the tube being plastic. If there is a heavy overload of toner particles in the tube, then the auger spring tends to compress to a shorter length. If the overload exceeds the acceptable stress levels, the auger may fail. Alternatively, if the auger does not fail, the drive motor may fail. Under these latter circumstances, toner particles are trapped in the cleaning unit and large quantities of waste toner particles build up. Thus, it is highly desirable to prevent the foregoing from occurring. As shown in Figure 1, a proximity sensor is positioned in the wall of tube 12. Metal auger spring 14 rotates to transport toner waste particles through tube 12. As shown, waste toner particles move in the direction of arrow 16 and fall from the end 18 of tube 12 into a waste toner storage area. Under normal operating conditi...