JP2007041156A5 - - Google Patents

Claims (13)

In a fixing device for fixing again a sheet mounted on an image forming apparatus and having a toner image fixed by a first fixing unit in the image forming apparatus,
A second fixing unit for fixing again the sheet on which the toner image is fixed by the first fixing unit;
A first conveyance path for conveying a sheet on which a toner image is fixed by the first fixing unit to the second fixing unit;
A second conveyance path for conveying the sheet downstream from the second fixing unit,
The second transport path has a curved guide surface, and the sheet on which the toner image is fixed again by the second fixing unit is disposed along the guide surface on the surface opposite to the surface on which the toner image is fixed. a fixing device, characterized in that to so that is guided. The second fixing unit includes a pair of fixing rollers that heat and press the sheet conveyed by the first conveying path, a downstream roller provided downstream of the pair of fixing rollers, and a pair of the fixing rollers. An endless belt wound around one roller and the downstream roller,
Wherein the pair of fixing rollers, the first sheet conveyed by the conveying path, but such pressing the toner image fixing surface to the endless belt of claim 1, wherein the fixing the Lato toner image again Fixing device.   3. The fixing device according to claim 2, wherein a cooling unit is provided between the pair of fixing rollers and the downstream roller, and the re-fixed sheet is cooled by the cooling unit. The cooling means in contact with the opposite side of the sheet pressing side of the endless belt, a fixing device according to claim 3, wherein cooling the sheet through the endless belt.   The sheet delivery section between the second fixing section and the first transport path is set at a position higher than the sheet delivery section with the second transport path, and the cooling means is more than the fixing roller pair. The fixing device according to claim 3, wherein the endless belt is inclined so as to be positioned below. Before Stories first conveying path, a fixing according to any one of claims 1 to 5, characterized in that it comprises the guide surface guide surface is curved in a curved direction opposite of the second conveying path apparatus. An image forming unit for forming a toner image on a sheet;
A first fixing unit for fixing a toner image on a sheet formed by the image forming unit;
An image forming apparatus comprising: the fixing device according to claim 1, wherein the sheet on which the toner image is fixed by the first fixing unit is fixed again. An image forming unit for forming a toner image on a sheet;
A first fixing portion for Fixing the toner image on the sheet formed by the image forming section,
A second fixing unit for fixing again the sheet on which the toner image is fixed by the first fixing unit;
A first conveyance path for conveying a sheet on which a toner image is fixed by the first fixing unit to the second fixing unit;
A second conveyance path for conveying the sheet downstream from the second fixing unit,
The second transport path has a curved guide surface, and the sheet on which the toner image is fixed again by the second fixing unit is disposed along the guide surface on the surface opposite to the surface on which the toner image is fixed. an image forming apparatus characterized in that the so that guided. The second fixing unit includes a pair of fixing rollers that heat and press the sheet conveyed by the first conveying path, a downstream roller provided downstream of the pair of fixing rollers, and a pair of the fixing rollers. An endless belt wound around one roller and the downstream roller,
By the fixing roller pair, said conveyed sheet by the first transport path, but such pressing the toner image fixing surface to the endless belt according to claim 8, wherein the fixing the Lato toner image again Image forming apparatus. The image forming apparatus according to claim 9 , wherein a cooling unit is provided between the fixing roller pair and the downstream roller, and the re-fixed sheet is cooled by the cooling unit. It said cooling means the sheet pressing side of the endless belt on the opposite side in contact with the image forming apparatus according to claim 10, wherein cooling the sheet through the endless belt. The sheet delivery section between the second fixing section and the first transport path is set at a position higher than the sheet delivery section with the second transport path, and the cooling means is more than the fixing roller pair. the image forming apparatus according to claim 10 or 11, wherein the tilting said endless belt so as to be positioned downward. Before Stories first conveying passage, an image according to any one of claims 8 to 12, characterized in that it comprises a curved guide surface which is curved in the opposite direction of the guide surface of the second transfer passage Forming equipment.