Image forming apparatus

An image forming apparatus, comprising:

• an image bearing member;
• a transfer device;
• a transfer bias power source that outputs one of a DC bias having a DC component and a superimposed bias having a superimposed AC component and DC component, to the transfer device to transfer a toner image from the image bearing member onto a sheet;
• a separation device that separates the sheet from the image bearing member;
• and
• a separation bias power source that outputs a separation bias to the separation device, wherein the separation bias power source outputs a first separation bias when the transfer bias power source outputs the DC bias, and the separation bias power source outputs a second separation bias that is different from the first separation bias when the transfer bias power source outputs the superimposed bias.

An image forming apparatus, comprising:

• an intermediate transfer belt that bears a toner image;
• a transfer roller that forms a transfer nip between the transfer roller and the intermediate transfer belt;
• a transfer bias power source that outputs one of a DC bias having a DC component and a superimposed bias having a superimposed AC component and DC component, to transfer the toner image onto a sheet at the transfer nip;
• a charge-eliminating needle disposed downstream from the transfer nip in a direction of transport of the sheet;
• and
• a charge-eliminating power source that outputs a charge-eliminating bias to the charge-eliminating needle,
• wherein the charge-eliminating power source outputs a first charge-eliminating bias when the transfer bias power source outputs the DC bias, and
• the charge-eliminating power source outputs a second charge-eliminating bias that is different from the first charge-eliminating bias when the transfer bias power source outputs the superimposed bias.

An image forming apparatus, comprising:

• an image bearing member that bears a toner image;
• a transfer member that forms a transfer nip between the transfer member and the image bearing member;
• a transfer bias power source that outputs a superimposed bias having a superimposed AC component and DC component to transfer the toner image onto a sheet at the transfer nip;
• a charge-eliminating needle disposed downstream from the transfer nip in a direction of transport of the sheet;
• and
• a charge-eliminating power source that outputs a charge-eliminating bias consisting only of a DC component to the charge-eliminating needle when the toner image is transferred onto the sheet.