Image-forming apparatus provided with fixing device including first fixing member, second fixing member, and pressure modifying mechanism modifying nip pressure of nip formed therebetween

An image-forming apparatus comprising:

• an image-forming section configured to form a developer image on a sheet;
• a sheet feeder configured to feed a sheet toward the image-forming section;
• a fixing device configured to fix a developer image on a sheet, the fixing device comprising:
• a first fixing member configured to rotate;
• a heater configured to heat the first fixing member;
• a motor configured to drive the first fixing member;
• a second fixing member configured to form a nip together with the first fixing member, the second fixing member being rotatable by following the first fixing member rotating;
• and
• a pressure modifying mechanism configured to modify a nip pressure at the nip to one of a first nip pressure and a second nip pressure smaller than the first nip pressure;
• and
• a controller configured to perform:
• energizing the heater to heat the first fixing member;
• rotating the motor to rotate the first fixing member;
• controlling the pressure modifying mechanism to set the nip pressure to the first nip pressure;
• and
• controlling the sheet feeder to feed a sheet toward the image-forming section,
• wherein in a first case where a sheet jam occurs in the image-forming apparatus and no sheet exists in the nip, the controller performs:
• reducing the nip pressure from the first nip pressure to the second nip pressure;
• and halting rotation of the first fixing member after completed the reducing, and
• wherein in a second case where a sheet jam occurs in the image-forming apparatus and a sheet exists in the nip, the controller performs:
• the halting;
• and the reducing after completed the halting.