Patent ID: 7668478

Claim:
An image forming apparatus comprising: an image bearing member which bears a toner image; a transfer member which is electrically connected to a ground and comes into pressure contact with the image bearing member, wherein the transfer member is rotatable and forms a transfer portion transferring the toner image on the image bearing member onto a recording material; a first cleaning brush which comes in contact with the transfer member and electrostatically collects the toner on the transfer member; a second cleaning brush which is arranged between a downstream side from the first cleaning brush and an upstream side from the transfer portion in a rotating direction of the transfer member, wherein the second cleaning brush comes in contact with the transfer member and electrostatically collects the toner on the transfer member; a collecting member which comes in contact with the first and the second cleaning brushes and electrostatically collects the toner on the first and the second cleaning brushes; and a power source which applies a current to the collecting member, and the current is constant current controlled so that a current value is constant, wherein the current applied from the power source to the collecting member is controlled by adjusting the current value to a set current value in order to satisfy the following requirements: when a ratio of an amount of toner which is collected by the first and the second cleaning brushes to an amount of toner on the transfer member is assumed to be α(%), and when a ratio of an amount of toner which is collected by the collecting member to an amount of toner on the first and the second cleaning brushes is assumed to be β(%), α>90(%), β>90(%), and α≦β.