Fixing device and image forming apparatus having the same

A fixing device comprising:

• fixing rollers which form a pair of rotators, for fusing and fixing an unfixed developer onto a recording medium by passing the recording medium having an image of an unfixed developer formed thereon through a pressure contact section formed by the fixing rollers;
• a belt-shaped cleaning member provided so as to contact at least either one of the fixing rollers, for cleaning a surface of the fixing roller;
• a pressure-contact roller provided so that a nip section serving as a press portion is formed by pressing the cleaning member onto the fixing roller which is in contact with the cleaning member;
• a feeding roller for feeding the belt-shaped cleaning member which has been rolled up;
• a winding roller for taking up the cleaning member which has been fed from the feeding roller and cleaned the surface of the fixing roller, the winding roller being provided so as to have a surface layer thereof in contact or pressure-contact with a surface layer of the feeding roller via the cleaning member;
• and
• a control portion for controlling rotary operation of either the feeding roller or the winding roller so that a sum of a feed amount of the cleaning member which is fed by the feeding roller at one feeding occasion, and a take-up amount of the cleaning member which is taken up by the winding roller at one take-up occasion, is equal to or more than a double of a length of the nip section in a circumferential direction of the pressure-contact roller.