Copying machines and laser beam printers form electrostatic charged latent images on the photosensitive unit surface by exposing the image areas of the original to light. A developing unit turns this into a visible image, and the transfer roller prints the image on paper. The paper leaves the photosensitive unit, and the image is fixed when the fusing process applies toner to the paper. A rubber blade then removes residual toner from surface of the photosensitive unit in preparation for further output.