This thesis will show how the Taguchi technique can be applied to a complex system and can be optimized with a minimum number of tests. The focus of this thesis is the application of Taguchi methods to the optimization of a xerographic developer auger system. An auger system was optimized to minimize the toner concentration across the magnetic roll. By minimizing the toner concentration variation across the magnetic roll, the visual density variation on the customer prints can be minimized. The technique was applied by determining the proper control factors that can be used to minimize the variation of the toner concentration. For this study, the auger pitch, auger design, auger speed and mass on the magnetic roll were chosen for the investigation. The worst case print area coverages were used as noise conditions. In this case there were , a blank page, a seventy five percent area coverage and a fifteen percent localized band. The response is the toner concentration standard deviation across the roll. The technique uses the minimization of the response in the presence of the noise conditions to optimize the system against the noises. The study provides an industrial application of the Taguchi methodologies and resulted in a significant improvement of the xerographic developer housing auger system. The optimum conditions found to minimize the variation in the toner concentration across the magnetic roll were found to be: 1) The 4890 style Mix auger (a style of auger that is designed to mix the toner and developer more efficiently) 2) The pitch to diameter of the Pick-up auger is optimal at 0.5 (P:D) 3) The speed of the Mix auger is optimal at 200 RPM resulting in a pick up auger speed of 140 RPM 4) The mass on the magnetic roll is optimal at 0.2 gms/cm2.
Library of Congress Subject Headings
Toners (Xerography); Xerography; Engineering design--Mathematical models; Taguchi methods (Quality control)
Department, Program, or Center
Mechanical Engineering (KGCOE)
Jugle, Kip, "Design optimization of a xerographic auger system" (1997). Thesis. Rochester Institute of Technology. Accessed from
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