Abstract
The doctor blade is a steel blade installed in electrophotographic (EP) printers as one of the ways to control the toner flow. It meters the amount of toner on the developer roller surface to develop a uniformly distributed toner layer on the photoconductor (PC) drum surface. The blade straightness can affect the overall uniformity of the printed page. In this paper, we propose an approach for quantifying the blade straightness to help assess the quality of the doctor blade before its installation into the printer. A polynomial fitting approach is applied to the straightness data measured directly from the blade. The probability mass function of the polynomial slopes is derived. The probability of the straightness variation provides a measure of the blade's quality. The same approach is applied to scans from printed samples showing artifacts caused by the same blade. A pass/fail criterion is used for both measures to determine their consistency in assessing the quality of the blade. Our experimental results show that both measures agree, for 20 of the 24 blades tested. This high level of consistency verifies the validity of assessing the blade quality from direct measurements on the blade using the proposed approach.
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