Patent ID: 9568861
Date: 2017-02-14
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image carrier being arranged rotatably and having a surface to carry a toner image transferred onto a transferred medium; a cleaning member rotating and coming into contact with the surface of the image carrier at a downstream side in a rotating direction from a transferring position transferring the toner image onto the transferred medium to collect a toner from the image carrier and to hold the toner; a deciding part deciding a wear amount of the cleaning member due to contact; a rotation controlling part changing rotational speed of the cleaning member in accordance with the wear amount decided by the deciding part; a developing part developing the toner image onto the image carrier by charged toner; a first voltage applying part applying a first bias with a reversed polarity to a first charging polarity of the toner of the image carrier into the cleaning member; a collecting roller rotating and coming into contact with the cleaning member and having a surface on which the toner held from the image carrier by the cleaning member is adhered; a scraping member coming into contact with the surface of the collecting member and scraping the adhered toner; and a photosensitive drum onto which the toner image to be transferred onto the image carrier is formed, wherein the image carrier is an intermediate transferring belt extended by a driving roller and a following roller, is subjected to first-transferring of the toner image from the photosensitive drum and second-transfers the toner image onto the transferred medium, the cleaning member is a brush roller having a plurality of brush bristles projected from an outer circumference of a rotating shaft to an outward side in a radial direction and their top portions are deformed by contact with the intermediate transferring belt, the first voltage applying part applies the first bias to the brush roller via the collecting roller, the deciding part decides the wear amount on the basis of any one or both of variation of the voltage value of the first bias applied into the collecting roller by the first voltage applying part and variation of a current value of current flowed from the first voltage applying part to the collecting roller.