摘要:
A cleaning device according to the present invention comprises which includes a cleaning belt, an unwinder, a winder, and a detector. The unwinder is wound with the cleaning belt. The winder winds up the cleaning belt intermittently from the unwinder along a path leading past a cleaning position where the belt is brought into contact with a body to be cleaned. The detector is fitted in a detecting position on the path between the unwinder and the cleaning position. The cleaning belt has an end point set on it near its trailing end and associated with the detecting position. When detecting the end point, the detector outputs a detection signal.
摘要:
A fixing apparatus for fusing and fixing an unfixed developer by heating/pressurizing a recording medium on which an image of the unfixed developer is formed, includes a fixing roller cleaning unit for cleaning surfaces of fixing rollers, and a propinquity/separation mechanism for moving the fixing roller cleaning unit close to and away from the fixing roller. The fixing apparatus operates the propinquity/separation mechanism so as to make the fixing roller cleaning unit contact the fixing roller when a temperature of the fixing roller becomes equal to or higher than a softening temperature of a developer. The fixing apparatus operates the propinquity/separation mechanism so as to move the fixing roller cleaning unit away from the fixing roller when a temperature of the fixing roller becomes lower than the softening temperature of the developer.
摘要:
An embodiment of a fixing apparatus according to the present invention is a fixing apparatus provided with a roller for fixing and a plurality of heat sources that heat a surface of the roller, in which a surface temperature of the roller is detected and controlled at a prescribed temperature while a sheet of recording paper is subjected to pressure and heat by the roller to fix a developer onto the sheet of recording paper, comprising: a plurality of temperature detection means for detecting the surface temperature of the roller, wherein at least one of the temperature detection means is arranged in a position of the roller that does not overlap any of the heat sources when viewed from a peripheral surface side of the roller, or is arranged in a position away from a region of the roller to be controlled at the prescribed temperature.
摘要:
A cleaning device according to the present invention comprises a cleaning belt, an unwinder, a winder, and a detector. The unwinder is wound with the cleaning belt. The winder winds up the cleaning belt intermittently from the unwinder along a path leading past a cleaning position where the belt is brought into contact with a body to be cleaned. The detector is fitted in a detecting position on the path between the unwinder and the cleaning position. The cleaning belt has an end point set on it near its trailing end and associated with the detecting position. When detecting the end point, the detector outputs a detection signal.
摘要:
An embodiment of a fixing apparatus according to the present invention is a fixing apparatus provided with a roller for fixing and a plurality of heat sources that heat a surface of the roller, in which a surface temperature of the roller is detected and controlled at a prescribed temperature while a sheet of recording paper is subjected to pressure and heat by the roller to fix a developer onto the sheet of recording paper, comprising: a plurality of temperature detection means for detecting the surface temperature of the roller, wherein at least one of the temperature detection means is arranged in a position of the roller that does not overlap any of the heat sources when viewed from a peripheral surface side of the roller, or is arranged in a position away from a region of the roller to be controlled at the prescribed temperature.
摘要:
A fixing device includes a feeding roller for feeding a belt-shaped cleaning member which has been rolled up, and 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. Each of the feeding roller and the winding roller rotates by a time control of a control portion 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 Ln of a nip section.
摘要:
In a fixing apparatus that an unfixed developer is fused and fixed by heating/pressurizing a recording medium on which an image of the unfixed developer is formed, a belt-shaped cleaning member is fed from a feeding roller, and the cleaning member is made to respectively contact a heating roller and a pressure roller by a pressure-contact roller, thereby cleaning that the heating roller and the pressure roller, respectively. When a winding roller takes up the cleaning member which has cleaned a roller surface, guide rollers are respectively provided between the pressure-contact roller and the winding roller, and between the feeding roller and the pressure-contact roller so as to contact the cleaning member.
摘要:
Since the paper entry guide is disposed below and in close proximity to a fixing belt, the leading edge of recording paper can become wavy or curled when operated in a high temperature, high humidity environment or when printing on the reverse side of the paper in double-sided print mode, and this has lead to the problem that the leading edge of the recording paper after transfer is not properly inserted in the narrow spacing between the paper entry guide and the fixing belt, resulting in a recording paper jam. A fixing device comprises a fixing belt stretched around a heating roller with a heat source contained therein and a fixing roller, a pressing roller for pressing the fixing roller from below via the fixing belt, and a paper entry guide disposed below and in close proximity to the fixing belt and upstream of a nipping portion composed of the fixing belt and the pressing roller. The paper entry guide is pivotably supported on a fulcrum. A solenoid is provided at the upstream side of the paper entry guide, and a return spring is disposed above the paper entry guide. The solenoid, when in the ON state, pulls a plunger to its lowermost position against the spring force of the return spring, and thereby rotates the paper entry guide in the clockwise direction about the fulcrum to maintain spacing with respect to the fixing belt.