Patent ID: 8666285

Claim:
A fixing device for fixing a toner image onto a recording paper sheet comprising: a heating member for heating said recording paper sheet; a pressing member for applying a pressure by forming contact with said heating member; a casing accommodating said heating member and said pressing member, and provided with an exit port for discharging said recording paper sheet; a closing portion arranged at said exit port for keeping a temperature of said casing, said closing portion having a rotation member and an opposed member forming a nip region together with said rotation member; a separating unit for changing at least a part of said closing portion from a closed state to an open state; said closing portion further includes an elastic member arranged on a side opposed to said rotation member with said opposed member therebetween for biasing said opposed member to press said opposed member against said rotation member, and said separating unit has a pressing member for pressing said opposed member, against a biasing force of said elastic member, in a direction separating said opposed member from said rotation member.