Image forming apparatus and conveyance control method

A conveyance control method of an image forming apparatus, the image forming apparatus including:

• a transferrer that forms a transfer nip for transferring an image to a sheet;
• and
• a conveyance roller pair disposed on an upstream side relative to the transfer nip in a conveyance direction of the sheet, the method comprising:
• controlling the conveyance roller pair such that the sheet conveyed to a conveyance nip formed by the conveyance roller pair is conveyed with a predetermined nip pressure so as to cause slack in the sheet between the transfer nip and the conveyance nip, and
• controlling the conveyance roller pair so as to reduce the nip pressure at the conveyance nip in accordance with an increase in a conveyance amount of the sheet at the conveyance nip such that the conveyance roller pair conveys the sheet in the state where the nip pressure is reduced.