Fixing device and image forming apparatus

An image forming apparatus comprising:

• an image bearer to bear a toner image;
• and
• a fixing device disposed downstream from the image bearer in a recording medium conveyance direction to fix the toner image on a recording medium,
• the fixing device including:
• a first rotator;
• a second rotator pressed against the first rotator to form a fixing nip therebetween, through which the recording medium bearing the toner image is conveyed;
• a thermal insulation cover disposed opposite the second rotator;
• and
• a mover connected to the second rotator to move the second rotator with respect to the first rotator, the mover coupled with the thermal insulation cover to move the thermal insulation cover while retaining a predetermined interval between the thermal insulation cover and the second rotator.