JP2008145451A5 - - Google Patents

Claims (6)

Image forming means for forming a toner image on a sheet;
A first fixing member having a heater; and a second fixing member provided opposite to the first fixing member . The sheet on which a toner image is formed by the image forming unit is fixed to the first fixing member. Fixing means for fixing the toner image on the sheet to the sheet by performing heating and pressurizing processes while being nipped and conveyed between the member and the second fixing member ;
And cooling means for cooling the second fixing member by said arranged to be toward and away from moving relative to the second fixing member, abuts against the second fixing member at the time of approaching,
Drive means for moving the cooling means toward and away from the second fixing member ;
An image forming apparatus comprising: a control unit that controls the driving unit to control a cooling state of the second fixing member. The control means controls the driving means so that the cooling means is separated from the second fixing member before an instruction to start image formation , and after the instruction to start image formation , the material of the sheet is predetermined. or depending on whether the material is closer to said cooling means to said second fixing member, so as to either be spaced from the second fixing member, claims, characterized in that for controlling the drive means The image forming apparatus according to 1. If the material of the sheet is a coated paper, wherein, the image according to claim 2, characterized in that for controlling so that said drive means to approximate the cooling means to the second fixing member Forming equipment. Temperature detecting means for detecting the temperature of the second fixing member;
When the temperature of the second fixing member detected by the temperature detecting unit is equal to or lower than a predetermined temperature, the control unit controls the driving unit to separate the cooling unit from the second fixing member. The image forming apparatus according to claim 3. The image forming apparatus according to claim 1, wherein the cooling unit is a cooling roller having a heat pipe. The image forming apparatus according to claim 1, wherein the second fixing member is a belt-shaped member, and the cooling unit is disposed on an inner surface side of the belt-shaped member. .