Abstract: A fixing device includes a cylindrical film, a nip forming member, a preventing member provided in a position opposing an end portion of the film with respect to a generatrix direction of the film and configured to prevent movement of the film in the generatrix direction, a frame, and a separating member configured to separate, from the film, a recording material discharged from the nip. The separating member is rotatable relative to the preventing member at a first portion thereof, and is slidable relative to the frame at a second portion thereof, the second portion being more remote from a surface of the film than the first portion, and a sliding direction of the separating member crossing a plane of the nip. The fixing device fixes, at the nip, a toner image on the recording material while nipping and feeding the recording material on which the toner image is formed.

Abstract: In a fixing device of the present invention, first and second movable members are each urged toward a flexible member so that the contact between contact surfaces of the first and second movable members and end faces of the flexible member are each maintained.

Abstract: An image forming apparatus including an apparatus main body including an image forming device that forms an image on a recording material, a unit detachably mounted in the apparatus main body, a switching member pivotably provided in the apparatus main body, wherein while in a state in which the switching member has entered into the unit mounted in the apparatus main body, the switching member selectively switches a route through which the recoding material is guided, and a retracting member provided in the apparatus main body, wherein in a course of dismounting the unit from the apparatus main body, the retracting member retracts the switching member to an outside of a mount area of the unit.

Abstract: A fixing apparatus includes a heater that is in contact with an inner surface of a film, a restricting member that restricts movement of the film in a longitudinal direction of the film, a connector that is connected electrically to the heater for supplying electric power to the heater, and a lock member that maintains a position of the restricting member and a position of the connector relative to each other.

Abstract: The disclosure provides a compact fixing device with reduced cost of wiring including electrical cables. In the fixing device, first and second wire guide members that seal a part of wires electrically connected to terminals of a temperature detection element and a part of wires electrically connected to terminals of a safety element are disposed in the internal space of a fixing film.

Abstract: An image forming apparatus includes an image fixing device having a nip; an air blower for feeding air for cooling a first area which is an end portion area, in a longitudinal direction of the fixing device, of the nip; a blocking member for changing a width of an opening through which the air flows; a first blow portion through which the air toward the opening; a second blow portion through which the air from the air blowing device toward a second area which is a region in a widthwise direction of the sheet passed through the nip flows; and a third blow portion through which the air from the air blower toward a third area which is closer to an end in the widthwise direction flows. The third blow portion is disposed at a position to take the air blocked by the blocking member.

Abstract: An image forming apparatus includes a main assembly and a unit detachably mountable to the main assembly. The main assembly includes a positioning portion. The unit includes a portion-to-be-positioned engaging with the positioning portion and a grip portion configured to be gripped by a user when the unit is demounted from the main assembly. The main assembly further includes an inclined surface provided immediately in front of the positioning portion with respect to a mounting direction of the unit to the main assembly and configured to guide the portion-to-be-positioned to the positioning portion. The grip portion includes a grip surface configured to receive a force exerted in a pulling-out direction of the unit by the user when the user pulls out the unit from the main assembly. The grip surface and the inclined surface form an angle of substantially not less than 90°.

Abstract: A drive transmission device includes a first gear, a cam configured to rotate in interrelation with rotation of the first gear and capable of changing a state of two members between a pressed state and a pressure-released state, a pressing member configured to press the cam, and a second gear configured to transmit drive to the first gear in engagement with the first gear. At least one of the first and second gears includes first teeth provided at positions corresponding to an engaging region in which the first gear is engaged with the second gear when the state of the two members is changed from the pressure-released state to the pressed state and includes second teeth provided at positions corresponding to a region other than the engaging region. Tooth thicknesses of the first teeth are thicker than tooth thicknesses of the second teeth.

Abstract: A fixing device includes a cylindrical film, a nip forming member, a preventing member provided in a position opposing an end portion of the film with respect to a generatrix direction of the film and configured to prevent movement of the film in the generatrix direction, a separating member configured to separate, from the film, a recording material discharged from the nip, and a frame. The fixing device fixes, at the nip, a toner image on the recording material while nipping and feeding the recording material on which the toner image is formed. The separating member is provided rotatably relative to the preventing member at a first portion thereof and is provided slidably relative to the frame at a second portion thereof. A sliding direction of the separating member crosses a plane of the nip.

Abstract: A fixing apparatus includes a rotating member including a conductive layer; a helical coil arranged inside the rotating member, a helical axis of the coil extending in a generatrix direction of the rotating member; and a magnetic member provided inside the coil, the magnetic member including a first magnetic member and a second magnetic member arranged in a line extending in the generatrix direction. A toner image is fixed on a recording material by heat which the conductive layer generates by electromagnetic induction. In the generatrix direction, a protruded portion is provided on an end surface of the first magnetic member and a recessed portion is provided in an end surface of the second magnetic member. The protruded portion and the recessed portion are disposed so as to oppose each other and overlap each other in the generatrix direction.

Abstract: A fixing apparatus includes a rotating member including a conductive layer; a helical coil arranged inside the rotating member, a helical axis of the coil extending in a generatrix direction of the rotating member; and a magnetic member provided inside the coil, the magnetic member including a first magnetic member and a second magnetic member arranged in a line extending in the generatrix direction. A toner image is fixed on a recording material by heat which the conductive layer generates by electromagnetic induction. In the generatrix direction, a protruded portion is provided on an end surface of the first magnetic member and a recessed portion is provided in an end surface of the second magnetic member. The protruded portion and the recessed portion are disposed so as to oppose each other and overlap each other in the generatrix direction.

Abstract: An image heating apparatus includes a rotatable fixing member; an air-blowing unit for blowing air onto an end portion of the rotatable fixing member with respect to a generating line direction of the rotatable fixing member, wherein the air-blowing unit includes a fan, a duct for guiding the air generated by drive of the fan, and a shutter, provided at an outlet of the duct, for switching an outlet width of the duct with respect to the generating line direction; and a partition, provided in the duct, for partitioning an air passing region inside the duct into a plurality of regions with respect to the generating line direction, wherein the partition extends to a neighborhood of the shutter with respect to an air-blowing direction.

Abstract: An image heating apparatus includes a rotatable fixing member; an air-blowing unit for blowing air onto an end portion of the rotatable fixing member with respect to a generating line direction of the rotatable fixing member, wherein the air-blowing unit includes a fan, a duct for guiding the air generated by drive of the fan, and a shutter, provided at an outlet of the duct, for switching an outlet width of the duct with respect to the generating line direction; and a partition, provided in the duct, for partitioning an air passing region inside the duct into a plurality of regions with respect to the generating line direction, wherein the partition extends to a neighborhood of the shutter with respect to an air-blowing direction.

Abstract: An image heating apparatus includes a rotatable fixing member; an air-blowing unit for blowing air onto an end portion of the rotatable fixing member with respect to a generating line direction of the rotatable fixing member, wherein the air-blowing unit includes a fan, a duct for guiding the air generated by drive of the fan, and a shutter, provided at an outlet of the duct, for switching an outlet width of the duct with respect to the generating line direction; and a partition, provided in the duct, for partitioning an air passing region inside the duct into a plurality of regions with respect to the generating line direction, wherein the partition extends to a neighborhood of the shutter with respect to an air-blowing direction.

Abstract: In an electrophotographic image forming apparatus employing a contact development system, contact of a development roller against a photosensitive drum is started while forming an electrostatic latent image of a detection pattern for detection in each individual apparatus, and a developed toner image is detected at a predetermined position. At this time, a time from the time when contact of the development roller was started until the time when the toner image was detected is measured, and a delay time from a time when contact operation of the development roller was started until a time of actual contact is calculated by subtracting the time needed until the developed toner image reaches the detection position. The time when contact of the development roller is started is delayed by this time. The same sort of control is also performed for the separation time.

Abstract: A toner pattern is detected by a color misregistration detection sensor to detect a duration of contact between a development roller and a photosensitive drum. A contact/separation motor for driving the development roller is accelerated or decelerated based on the detected duration of contact between the development roller and the photosensitive drum. This control enables shortening the duration of contact between the development roller and the photosensitive drum, thus reducing the shortening of their lifetime.

Abstract: An image heating apparatus includes a rotatable fixing member; an air-blowing unit for blowing air onto an end portion of the rotatable fixing member with respect to a generating line direction of the rotatable fixing member, wherein the air-blowing unit includes a fan, a duct for guiding the air generated by drive of the fan, and a shutter, provided at an outlet of the duct, for switching an outlet width of the duct with respect to the generating line direction; and a partition, provided in the duct, for partitioning an air passing region inside the duct into a plurality of regions with respect to the generating line direction, wherein the partition extends to a neighborhood of the shutter with respect to an air-blowing direction.

Abstract: An image forming apparatus includes a photosensitive drum, an optical unit provided below the photosensitive drum and including a cover glass for transmitting light emitted toward the photosensitive drum, and a cleaning member configured to clean a surface of the cover glass. The cleaning member includes a cleaning sheet configured to move foreign substances on the surface, and a wiping member configured to wipe foreign substances from the surface. The cleaning sheet and the wiping member move in contact with the surface of the cover glass when the cleaning member cleans the surface. The wiping member moves in contact with a portion of the surface of the cover glass after the cleaning sheet moves in contact with the portion. Accordingly, the cover glass can be reliably cleaned even when an unexpectedly large number of foreign substances that vary in particle size and shape adhere to the cover glass.

Abstract: An image forming apparatus includes a photosensitive drum, an optical unit provided below the photosensitive drum and including a cover glass for transmitting light emitted toward the photosensitive drum, and a cleaning member configured to clean a surface of the cover glass. The cleaning member includes a cleaning sheet configured to move foreign substances on the surface, and a wiping member configured to wipe foreign substances from the surface. The cleaning sheet and the wiping member move in contact with the surface of the cover glass when the cleaning member cleans the surface. The wiping member moves in contact with a portion of the surface of the cover glass after the cleaning sheet moves in contact with the portion. Accordingly, the cover glass can be reliably cleaned even when an unexpectedly large number of foreign substances that vary in particle size and shape adhere to the cover glass.

Abstract: An image forming apparatus includes a photosensitive drum, an optical unit provided below the photosensitive drum and including a cover glass for transmitting light emitted toward the photosensitive drum, and a cleaning member configured to clean a surface of the cover glass. The cleaning member includes a cleaning sheet configured to move foreign substances on the surface, and a wiping member configured to wipe foreign substances from the surface. The cleaning sheet and the wiping member move in contact with the surface of the cover glass when the cleaning member cleans the surface. The wiping member moves in contact with a portion of the surface of the cover glass after the cleaning sheet moves in contact with the portion. Accordingly, the cover glass can be reliably cleaned even when an unexpectedly large number of foreign substances that vary in particle size and shape adhere to the cover glass.