Patent ID: 7103295

Claim:
An image forming apparatus having: an image bearing member bearing a toner image; an intermediate transferring material that contacts with said image bearing member; transferring means that transfers a toner image on said image bearing member to the intermediate transferring material at a transferring position; bias applying means that applies a bias to a power supply portion of said transferring means during a period in which a transfer is performed by said transferring means; cleaning means that contacts with said image bearing member to clean a surface of said image bearing member; toner supplying means that, at a time when an image is not being formed, passes a toner image for supply formed on said image bearing member through the transferring position to supply the toner image for supply to said cleaning means; and switching means that switches from a first state in which said power supply portion is electrically connected to said bias applying means to a second state in which a resistance value between said power supply portion and a ground is equal to or greater than 100 MΩ, wherein, when the toner image for supply on said image bearing member passes through the transferring position, said switching means has switched from the first state to the second state.