Abstract: An image forming apparatus includes a pre-fusing paper sheet guide, a fuser unit and a control section. The pre-fusing paper sheet guide is disposed adjacent to the fuser unit on its upstream side. The fuser unit includes a pressing roller having, an electrically conductive surface, a grounding structure grounding a pressing roller's surface, and a cleaning mechanism cleaning the pressing roller's surface. The cleaning mechanism includes a web and a take-up roller. The control section sets a winding quantity x of the web to 0.7 mm when a setting for printing without margin is not made, and sets the winding quantity x to 2.1 mm when the setting for printing without margin is made. If the number of sheets accumulated through the image forming process becomes not less than 18, the control section causes the take-up roller to wind the web by the winding quantity x, and performs an image forming process.

Abstract: An image forming apparatus includes a pre-fusing paper sheet guide, a fuser unit and a control section. The pre-fusing paper sheet guide is disposed adjacent to the fuser unit on its upstream side. The fuser unit includes a pressing roller having, an electrically conductive surface, a grounding structure grounding a pressing roller's surface, and a cleaning mechanism cleaning the pressing roller's surface. The cleaning mechanism includes a web and a take-up roller. The control section sets a winding quantity x of the web to 0.7 mm when a setting for printing without margin is not made, and sets the winding quantity x to 2.1 mm when the setting for printing without margin is made. If the number of sheets accumulated through the image forming process becomes not less than 18, the control section causes the take-up roller to wind the web by the winding quantity x, and performs an image forming process.

Abstract: A fixing device is provided with a fixing roller, a peeling claw that peels a recording paper from the fixing roller, a peeling claw holder that rotatably supports the peeling claw, and a support member that movably supports the peeling claw holder to enable the peeling claw to retract by moving apart from the fixing roller, wherein not less than two directions are set as retracting directions of the peeling claw holder to be moved when the peeling claw is caused to retract by moving apart from the fixing roller.

Abstract: A fixing device is provided with a fixing roller, a peeling claw that peels a recording paper from the fixing roller, a peeling claw holder that rotatably supports the peeling claw, and a support member that movably supports the peeling claw holder to enable the peeling claw to retract by moving apart from the fixing roller, wherein not less than two directions are set as retracting directions of the peeling claw holder to be moved when the peeling claw is caused to retract by moving apart from the fixing roller.

Abstract: A paper separation claw is separated from a surface of a pressure roller by a drive source being turned ON at a time t2 before commencement of rotation of the pressure roller, and the paper separation claw is made to contact the surface of the pressure roller by the drive source being turned OFF after commencement of rotation (a time t4) of the pressure roller. Furthermore, the paper separation claw is separated from the surface of the pressure roller by the drive source being turned ON again before stopping of rotation (a time t5) of the pressure roller after an image forming operation of a single job is finished, and the paper separation claw is made to contact the surface of the pressure roller by the drive source being turned OFF again after stopping of rotation (a time t8) of the pressure roller.

Abstract: A recording medium discharge mechanism is provided with a side wall member capable of changing position between an upright state in which small size sheets are caught when small size sheets are discharged and a laid flat state in which a placement surface of a discharge space is extended for placement of large size sheets when large size sheets are discharged by a discharge mechanism having the discharge space, whose downstream side in a paper discharge direction has been opened. In the upright state, the side wall member does not protrude laterally from an apparatus. Furthermore, in the laid flat state, large size sheets can be placed.

Abstract: A fuser unit for an image forming apparatus including: a tape-like cleaning member that abuts on a fuser roller and cleans its peripheral surface; a press roller that presses the fuser roller via the cleaning member; a feed roller that feeds said cleaning member; a wind roller that winds the cleaning member therearound; and a controller that actuates a fixing function before an image formation, stops it after said image formation, and rotates and stops the wind roller and/or the feed roller to control a winding quantity of the cleaning member, wherein said controller calculates a toner image amount based on the prescribed number of pages by tracking from a page on which an image is formed just before the image formation is completed, and determines whether or not said cleaning member is wound around the wind roller during a non-fixing period based on the calculated toner image amount.

Abstract: One embodiment of the present invention involves a roller drive control method for a fixing apparatus in which a separation claw for separating a recording paper and a cleaning unit for removing toner that has become residual on a surface of a heat roller are arranged near a surface of the heat roller that fixes toner onto the recording paper, wherein a predetermined period different from a fixing process period in which fixing of toner onto the recording paper is carried out is set as a toner removal period for removing toner that has adhered to the separation claw, and the heat roller is rotationally driven so that the rotation velocity of the heat roller is different in the fixing process period and the toner removal period.

Abstract: A fixing device mounted in an electrophotographic image forming apparatus, for fixing a toner image formed on recording paper includes: a plurality of peeling claws provided for peeling off the recording paper from a fixing roller; a number-of-processed-sheet detecting portion for detecting a number of processed sheets of recording paper which is treated with a fixing process upon passing through the fixing roller; a peeling claw driving section for moving a plurality of the peeling claws in parallel with an axial direction of the fixing roller; and a control unit for controlling the peeling claw driving section to operate so that a relative position between the peeling claw and the fixing roller changes according to a detected output of the number-of-processed-sheet detecting portion.

Abstract: A fixing unit includes a heat roller and a pressing roller that comes in pressure contact with the heat roller, and passes the recording paper with an unfixed toner image formed thereon through the nip between the heat roller and pressing roller to thereby fix the toner image to the recording paper by applying heat and pressure thereto. A cleaning device for removing the toner remaining on the heat roller or pressing roller in the fixing unit includes cleaning rollers made of metal arranged in press-contact with the heat roller and pressing roller, the peripheral surface of the cleaning rollers being formed with projected and indented shapes to thereby remove the leftover toner appropriately.

Abstract: Pyrazolo-quinazoline derivatives of formula (Ia) or (Ib) as defined in the specification, and pharmeceutically acceptable salts thereof, process for their preparation and pharmaceutical composition comprising them are disclosed; the compounds of the invention maybe useful in therapy, in the treatment of diseases associated with a disregulated protein kinase activity, like cancer.

Abstract: A fixing apparatus that firmly adheres unfixed toner onto a recording sheet includes a first cleaning unit for cleaning up toner adhering to a surface of a heating roller by using a belt-shaped cleaning member, and a second cleaning unit for cleaning up toner adhering to a surface of a pressurizing roller by using a roller-shaped member, wherein oil for promoting releasability is not supplied from the first cleaning unit whose cleaning member is an oilless member to the heating roller, and the oil is supplied only from the roller-shaped member of the second cleaning unit to the pressurizing roller.

Abstract: A fuser unit for an image forming apparatus including: a tape-like cleaning member that abuts on a fuser roller and cleans its peripheral surface; a press roller that presses the fuser roller via the cleaning member; a feed roller that feeds said cleaning member; a wind roller that winds the cleaning member therearound; and a controller that actuates a fixing function before an image formation, stops it after said image formation, and rotates and stops the wind roller and/or the feed roller to control a winding quantity of the cleaning member, wherein said controller calculates a toner image amount based on the prescribed number of pages by tracking from a page on which an image is formed just before the image formation is completed, and determines whether or not said cleaning member is wound around the wind roller during a non-fixing period based on the calculated toner image amount.

Abstract: A fixing device includes a fixing member in contact with an unfixed image constituted of developer T on one side of a recording material P; and a pressure member pressed against the fixing member. The fixing device fixes the unfixed image onto the recording material P by causing the recording material P, charged so as to have a same polarity as a polarity of the developer T, to pass through a gap between the fixing member and the pressure member. In the fixing device, an inflow current into the fixing member Ih is 0 when the recording material P passes through the gap between the fixing member and the pressure member. This securely restrains the developer on the recording material from electrostatically offset to the side of the fixing device, thereby maintaining the formation of high quality images.

Abstract: The present invention provides a fixing device for fixing a toner image formed on paper by sandwiching the paper in a nip region between a heating roller and a pressing roller and pressing the paper while heating the paper to a fixing temperature. This fixing device includes a cleaning roller that is in contact with the pressing roller, and temperature control means that sets a temperature of the heating roller to a cleaning temperature that is higher than the fixing temperature.

Abstract: One embodiment of the present invention involves a roller drive control method for a fixing apparatus in which a separation claw for separating a recording paper and a cleaning unit for removing toner that has become residual on a surface of a heat roller are arranged near a surface of the heat roller that fixes toner onto the recording paper, wherein a predetermined period different from a fixing process period in which fixing of toner onto the recording paper is carried out is set as a toner removal period for removing toner that has adhered to the separation claw, and the heat roller is rotationally driven so that the rotation velocity of the heat roller is different in the fixing process period and the toner removal period.

Abstract: A fixing apparatus that firmly adheres unfixed toner onto a recording sheet includes a first cleaning unit for cleaning up toner adhering to a surface of a heating roller by using a belt-shaped cleaning member, and a second cleaning unit for cleaning up toner adhering to a surface of a pressurizing roller by using a roller-shaped member, wherein oil for promoting releasability is not supplied from the first cleaning unit whose cleaning member is an oilless member to the heating roller, and the oil is supplied only from the roller-shaped member of the second cleaning unit to the pressurizing roller.

Abstract: A fixing device mounted in an electrophotographic image forming apparatus, for fixing a toner image formed on recording paper includes: a plurality of peeling claws provided for peeling off the recording paper from a fixing roller; a number-of-processed-sheet detecting portion for detecting a number of processed sheets of recording paper which is treated with a fixing process upon passing through the fixing roller; a peeling claw driving section for moving a plurality of the peeling claws in parallel with an axial direction of the fixing roller; and a control unit for controlling the peeling claw driving section to operate so that a relative position between the peeling claw and the fixing roller changes according to a detected output of the number-of-processed-sheet detecting portion.

Abstract: A recording medium discharge mechanism is provided with a side wall member capable of changing position between an upright state in which small size sheets are caught when small size sheets are discharged and a laid flat state in which a placement surface of a discharge space is extended for placement of large size sheets when large size sheets are discharged by a discharge mechanism having the discharge space, whose downstream side in a paper discharge direction has been opened. In the upright state, the side wall member does not protrude laterally from an apparatus. Furthermore, in the laid flat state, large size sheets can be placed.

Abstract: A fixing unit includes a heat roller and a pressing roller that comes in pressure contact with the heat roller, and passes the recording paper with an unfixed toner image formed thereon through the nip between the heat roller and pressing roller to thereby fix the toner image to the recording paper by applying heat and pressure thereto. A cleaning device for removing the toner remaining on the heat roller or pressing roller in the fixing unit includes cleaning rollers made of metal arranged in press-contact with the heat roller and pressing roller, the peripheral surface of the cleaning rollers being formed with projected and indented shapes to thereby remove the leftover toner appropriately.