Patent ID: 8818217

Claim:
An image forming apparatus comprising: an image bearing member that is rotatable; a toner image forming portion that is able to form a toner image to be transferred to a transfer material and a control toner image not to be transferred to a transfer material on the image bearing member; a transfer member that transfers the toner image formed on the image bearing member to the transfer material; a detecting portion that detects a density of the control toner image; an adjustment portion that adjusts a toner image formation condition of the toner image forming portion based on an output of the detecting portion; a cleaning member that electrostatically cleans the transfer member; and a controller which changes a voltage or a current to be applied between the transfer member and the cleaning member based on the density of the control toner image, wherein when a previous control toner image and a subsequent control toner image adjacent to each other with a predetermined gap in a movement direction of the image bearing member are present on the surface of the image bearing member, the larger a density difference between the previous control toner image and the subsequent control toner image becomes, the larger the controller sets the predetermined gap.