| 摘要 |
An electrophotographic copying machine of the image transfer type includes a rotated photosensitive drum with a photoconductive peripheral face, a first pair of cooperating rollers for withdrawing successive copy paper sheets from a cassette and advancing them along a path to a second pair of cooperating rollers which is proximate and advances individual sheets to the image transfer station at the drum, the second roll pair being rotated at the peripheral speed of the drum and in timed relation to the drum advanced image. In order to remove paper and other dust from the copy paper delivered to the transfer station, one of the second rolls has a dielectric peripheral face formed, for example, of polyvinyl chloride and the other second roll is formed of rubber. A longitudinally extending cleaning pad frictionally engages the roller dielectric face and is formed of an elastic material, such as a foamed polyurethane, to remove dust from and triboelectrically charge the dielectric face. The pad is longitudinally retractable from the roller across a brush which cleans the pad and deposits the removed dust into an underlying receptacle.
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