Patent ID: 8787806

Claim:
An image forming apparatus, comprising: an image bearing member to bear a toner image on a surface thereof; a transfer device to transfer the toner image onto a recording medium; a sheet separation device to separate the recording medium bearing the toner image on the surface thereof from the image bearing member; a sheet separation bias application device connected to the sheet separation device to selectively apply to the sheet separation device one of a sheet separation bias having a DC component, and a sheet separation bias having a superimposed AC component and DC component; and a transfer bias application device connected to the transfer device, to selectively apply to the transfer device one of a DC transfer bias having a DC component and a superimposed transfer bias in which an AC component is superimposed on a DC component, wherein, upon application of the superimposed transfer bias to the transfer device, the sheet separation bias applied to the sheet separation device is changed from the sheet separation bias applied upon application of the DC transfer bias to the transfer device.