IMAGE FORMING APPARATUS

To provide a configuration that performs primary transfer by causing current to flow in a circumferential direction of an intermediate transfer belt, and can effectively prevent scattering of toner despite the presence of a plurality of modes different in the rotation speed of the intermediate transfer belt from a low speed to a high speed.SOLUTION: An image forming apparatus has: image carriers; an intermediate transfer belt; voltage application members for performing a primary transfer operation; and a control unit that has a first mode for rotating the intermediate transfer belt and a second mode for rotating the intermediate transfer belt at a rotation speed higher than the first mode. The intermediate transfer belt is configured such that, when voltage is applied by the voltage application members, current flows in the direction of rotation of the intermediate transfer belt. The control unit controls to decrease the voltage applied to the intermediate transfer belt during the primary transfer operation in the second mode compared with the first mode.SELECTED DRAWING: Figure 3 【課題】 中間転写ベルトの周方向に電流を流すことで一次転写を行う構成において、中間転写ベルトの回転速度が低速から高速まで異なる複数のモードを有しても、トナーの飛び散りを効果的に抑制できる構成を提供する。【解決手段】 像担持体と、中間転写ベルトと、一次転写動作を行うための電圧印加部材と、中間転写ベルトを回転させる第１モードおよび第１モードよりも高い回転速度で中間転写ベルトを回転させる第２モードを有する制御部と、を有し、中間転写ベルトは、電圧印加部材によって電圧が印加されたとき、該中間転写ベルトの回転方向に電流が流れるように構成されており、制御部は、第１モードよりも、第２モードでは、一次転写動作時に中間転写ベルトに印加する電圧が低くなるように制御を行う。【選択図】 図３