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Methods for Performance Testing of Xerographic Machines

IP.com Disclosure Number: IPCOM000046000D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Bielen, AF: AUTHOR [+3]

Abstract

Light patterns in either direction through optics of a xerographic machine are employed to measure and/or sense performance operation of the copier for testing purposes. A detector arrangement at the normal output of the optics determines proper movement of original documents relative to a scanning window, while supplementary light sources at the output of the optics reflect light patterns back to the scanning window for sensing or measuring.

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Methods for Performance Testing of Xerographic Machines

Light patterns in either direction through optics of a xerographic machine are employed to measure and/or sense performance operation of the copier for testing purposes. A detector arrangement at the normal output of the optics determines proper movement of original documents relative to a scanning window, while supplementary light sources at the output of the optics reflect light patterns back to the scanning window for sensing or measuring.

Copier 10 (Fig. 1) has a recirculating document feed assembly shown generally at 12. The top cover is also part of the document feeder. Original documents are introduced at inlet 15 and driven by roller sets, such as 16, 17 and l8, past an optical scan location including a fiber-optic or SELFOC* array 20. Fluorescent lamps 21 and 22 illuminate the document as it passes the scan window location for array 20. In normal operation, a photoconductor belt 25 mounted on a retaining capstan 26 passes the output of array 20 and develops the image at developer 28 for subsequent transfer at 29 to a copy sheet from supply cassette 30. The fused and transferred image is returned to output tray 31 of cassette 30. For multiple copies of a single original, gate 35 is positioned downwardly around pivot 36 so as to reintroduce the original document to recirculating path 38. Once a suitable number of copies are completed, the original document is allowed to exit at 40.

To determine correct paper positioning and movement as performedby the copier 10 recirculating document feeder, at the subassembly level, a test fixture which simulates the lower portion of the machine incorporates a sensor board 50, as shown in Fig. 2, positioned to receive the output of optic array 20. In a typical installation, sensor board 50 is placed either on top of the belt 25 under the output of fiber-optic array 20 or replaces the photoconducto...