Image forming apparatus

An image forming apparatus comprising:

• a photosensitive drum rotatable about an axis extending in a first direction;
• a development device configured to supply toner to the photosensitive drum;
• a transfer roller configured to transfer toner on the photosensitive drum to a sheet, the transfer roller being located on one side of the photosensitive drum in a second direction crossing the first direction, the transfer roller being configured to contact the photosensitive drum;
• a fuser configured to fix toner on the sheet, the fuser including a heater configured to heat the sheet and a pressure roller configured to press the sheet;
• a chute located between the transfer roller and the fuser in a third direction crossing both the first direction and the second direction, the chute causing the sheet having passed through a transfer nip to be directed toward a fixing nip, the transfer nip being a nip between the photosensitive drum and the transfer roller, the fixing nip being a nip between the heater and the pressure roller, the chute being movable in the second direction between a first position and a second position shifted from the first position toward the one side in the second direction, the chute located at the second position being farther away from an imaginary plane than the chute located at the first position, the imaginary plane passing through the transfer nip and the fixing nip;
• a pressing member configured to press the chute from the second position toward the first position;
• a drive source;
• a reciprocating mechanism configured to reciprocate by drive force from the drive source and to press the chute to move from the first position to the second position against pressing force of the pressing member;
• and
• a controller configured to:
• in response to determining that a parameter is greater than a threshold for the parameter, execute a first mode of actuating the drive source when conveying one sheet, the parameter decreasing as a conveyance speed of the sheet at the fixing nip increases, the threshold being such a value that, when the parameter is greater than the threshold, a difference between a conveyance speed of the sheet at the transfer nip and the conveyance speed of the sheet at the fixing nip is greater than a particular level;
• and
• in response to determining that the parameter is smaller than or equal to the threshold, execute a second mode of not actuating the drive source when conveying one sheet.