Abstract: A device for cleaning a transfer belt of an image-forming machine in which the transfer belt is wound around a drive roller and a driven roller that are disposed at a predetermined distance, in parallel with each other and is positioned opposite a photosensitive material drum in a transfer zone. A fur brush which has an electrically conducting property is rotated in contact with the surface of the transfer belt. A bias voltage is applied to the fur brush, the bias voltage having a polarity the same as the polarity for electrically charging the toner of a toner image formed on the photosensitive material drum. An opposed electrode is disposed opposite the fur brush and in contact with the back surface of the transfer belt.

Abstract: A latent electrostatic image developing device for use in developing a latent electrostatic image to a toner image in an image forming machine. The device includes a developing roller within a development housing for holding a developer on its surface in a developer holding zone and conveying the developer, which is held to a developing zone, in order to apply it to a latent electrostatic image. A restricting portion has a blade which includes a rigid part for acting on the surface of the developing roller in a developer restricting zone located between the developer holding zone and the developing zone in order to restrict the amount of the developer held on the surface. The blade is caused to protrude to the upstream side as viewed in the direction of movement of the developing roller, and that border of its protrusion facing the developing roller is provided with a C 0.1 to 0.6 mm chamfer (C being the JIS designation for a 45 degree chamfer).