Image forming apparatus

An image forming apparatus of an electrophotographic type, comprising:

• a fixing device including a heater and a presser;
• a discharge-roller unit including a first frame configured to be movable between a first position and a second position and a discharge roller pair supported by the first frame, the discharge roller pair including a first roller disposed so as to come into contact with one surface of a sheet that has contacted the heater and a second roller disposed so as to come into contact with the other surface of the sheet that has contacted the presser;
• and
• an arm supporting one of the heater and the presser while being coupled to the first frame, the arm being configured to move the one of the heater and the presser in accordance with a movement of the first frame,
• wherein, when the first frame is located at the first position, a nip position of the discharge roller pair is located at a first nip position and the arm supports the one of the heater and the presser at a first press-contact position so as to permit the heater and the presser to be held in pressing contact with each other at a predetermined pressure, and
• wherein, when the first frame is located at the second position, the nip position of the discharge roller pair is located at a second nip position which is shifted from the first nip position in a direction from the heater toward the presser, and the arm supports the one of the heater and the presser at a second press-contact position so as to permit the heater and the presser to be held in pressing contact with each other at a pressure lower than the predetermined pressure.