Image forming system

An image forming system comprising:

• a rotatable image bearing drum to bear a toner image;
• a transfer roller or belt to form a transfer nip between the image bearing drum and the transfer roller or belt;
• a power supply to output a bias to transfer the toner image from the image bearing drum to a sheet in the transfer nip;
• and
• a sheet processor to selectively perform a first post-processing on the sheet on which the toner image is formed and a second post-processing on the sheet on which the toner image is formed,
• wherein when the first post-processing is performed and an inter-sheet area between a plurality of sheets is in the transfer nip, the image forming system stops rotation of the image bearing drum,
• and wherein when the second post-processing is performed and the inter-sheet area is in the transfer nip, the image forming system maintains rotation of the image bearing drum.

An image forming system comprising:

• a rotatable image bearing drum to bear a toner image;
• a transfer roller or belt to form a transfer nip between the image bearing drum and the transfer roller or belt;
• a power supply to output a bias to transfer the toner image from the image bearing drum to a sheet in the transfer nip;
• and
• a sheet processor to perform a post-processing on the sheet on which the toner image is formed,
• wherein a linear velocity of the image bearing drum, when the post-processing is performed and an inter-sheet area between a plurality of sheets is in the transfer nip, is lower than the velocity of the image bearing drum during image formation.

An image forming method comprising:

• transferring a toner image from a rotatable image bearing drum to a sheet at a transfer position;
• post-processing on the sheet on which the toner image is formed;
• and
• stopping rotation of the image bearing drum, when an inter-sheet area between a plurality of sheets is at the transfer position and the post-processing is performed.