Abstract: There is provided an image forming apparatus including a body, a drum cartridge and a developing cartridge both of which are installable into the body, and a shutter attached to the body. The shutter is movable between a first position to prevent installation of the developing cartridge while allowing installation of the drum cartridge with the drum cartridge and the developing cartridge being removed from the body, and a second position to allow installation of the developing cartridge with the drum cartridge being installed in the body.
Abstract: An image forming apparatus includes: an image carrier that carries a toner image; a developing part that accommodates two-component developer containing toner and a carrier, and supplies the toner to the image carrier; a transferor that transfers the toner image on the image carrier onto paper; a cleaning member that removes the toner remaining on the image carrier; and a hardware processor that controls toner discharge operation in the developing part according to a toner discharge condition, in which the hardware processor sets the toner discharge condition so that a replacement time of the cleaning member overlaps with a replacement time of another consumable.
Abstract: A heater holder includes a restriction portion and a recessed portion. The restriction portion determines the position of a cable in the longitudinal direction of the heater. The recessed portion, against which a bare conductive portion of the cable is to be positioned, is provided at a position that is different from the position of the restriction portion as viewed in a direction intersecting with the longitudinal direction. A wire is joined to the bare conductive portion somewhere between the restriction portion and the recessed portion.
Abstract: A cleaning device scrapes off and removes toner that has adhered to a surface of a rotating photoreceptor, and includes: a cleaning member formed of an elastic body; a leaf spring member for pressing the cleaning member against the surface of the photoreceptor; and a support portion supporting the leaf spring member. The cleaning member is fixed to one end of the leaf spring member, and the other end of the leaf spring member is fixed to the support portion with a cushioning member formed of an elastic body interposed therebetween. The cushioning member is fixed to the other end of the leaf spring member by an adhesive.
Abstract: An image heating apparatus includes a controller configured to control a temperature at which energization to a heater is turned off, depending on a detection temperature of a detecting portion, wherein, when a temperature rise rate per unit time of the detection temperature of the detecting portion is a first rise rate, the controller turns off the energization to the heater in response to the detection temperature reaching a first temperature, and, when the temperature rise rate per unit time is a second rise rate that is less than the first rise rate, the controller turns off the energization to the heater in response to the detection temperature reaching a second temperature that is greater than the first temperature.
Abstract: An image forming apparatus operable in conjunction with a cartridge having a memory and a terminal, which is electrically connected with the memory and arranged on a downward face of the cartridge, is provided. The image forming apparatus includes a housing having an opening, a controller, and a supporter to support the cartridge at an attachment position. The supporter includes a guiding portion to guide the cartridge there-along and a memory electrode electrically connected with the controller. The guiding portion guides the cartridge being attached to the attachment position to descend as the cartridge approaches from the opening to the attachment position. The memory electrode protrudes upward at a position lower than the terminal on the cartridge and has a height to contact the terminal to electrically connect the controller with the memory when the cartridge is at the attachment position.
Abstract: An image forming apparatus includes a photoconductor, a charging roller for charging the photoconductor, a current sensor for detecting a value of current flowing through the photoconductor or the charging roller as a result of application of voltage to the charging roller, an acquisition sensor for acquiring an environment value representing an environment state inside the image forming apparatus, and a processor configured to estimate a film thickness of the photoconductor, based on a value of current detected by the current sensor when a state in which the environment value falls within a predetermined range continues for a predetermined time or longer.
Abstract: An intermediate transfer unit includes an endless intermediate transfer belt to which a toner image is primarily transferred from an image carrying member, a driving roller that conveys the intermediate transfer belt with the primarily transferred toner image to a secondary transfer position for a sheet material, and a cleaning device which cleans a peripheral surface of the driving roller around which the intermediate transfer belt is wound.
Abstract: An image forming apparatus includes: a drum unit having an image carrier carrying a toner image; a fixing unit having a heating member and pressure member forming a fixing nip part with the heating member and fixing the toner image on a recording medium at the fixing nip part; a cooling duct provided between the drum unit and the fixing unit preventing heat transfer from the fixing unit to the drum unit; and a cooling fan causing the air to flow to the cooling duct. The cooling duct is a movable duct being changeable to a first state in which the cooling duct is unopen towards the fixing unit and a second state in which the cooling duct is open towards the fixing unit. The cooling duct changes to the first state during image formation by the drum unit and changes to the second state after the image formation.
Abstract: An image forming apparatus includes a movement member arranged to move a cartridge and is movable between a first position for disposing the cartridge at a position where image formation is possible and a second position where the cartridge is attachable to and detachable from the movement member. At least one coupling provided in the cartridge is, when the movement member is at the first position, moved to a drive position where the coupling is arranged to engage with a drive member to rotate at least one rotating member, and while the movement member is being moved from the second to first positions, the at least one coupling is at an inclined position.
Abstract: An image forming apparatus includes: a cover configured to be pivotal between a closed position and an open position to open an opening portion through which an intermediate transfer unit is removable, wherein when the cover is moved from an intermediate position to the open position, a secondary transfer unit is changed by using a self-weight of the secondary transfer unit from a first relative position to a second relative position, and wherein when the cover is located in the open position and the intermediate transfer unit is supported in a first position by a guiding portion, a secondary transfer unit interferes with the intermediate transfer unit if located in the first relative position, but does not interfere with the intermediate transfer unit if located in the second relative position.
Abstract: To switch between four nip modes, a cam is driven by a single drive to move between first to fourth positions. At the first position, a first nip between a first pressing body and a fixing member has a first width, and a second nip between a second pressing body and the fixing member has a second width. At the second position, the first nip has a third width smaller than the first width, and the second nip has a width greater than or equal to the second width. At the third position, the first nip has a width greater than or equal to the first width, and the second nip has a fourth width smaller than the second width. At the fourth position, the first nip has a fifth width smaller than the first width, and the second nip has a sixth width smaller than the second width.
Abstract: A developing device includes: a developing tank that is long in shape and that stores a developer; and a developer carrier that carries the developer stored in the developing tank. The developing tank includes a filling portion through which the developing tank is filled with the developer, the developer carrier is provided on one side in a width direction that is orthogonal to both a longitudinal direction of the developing tank and a vertical direction of the developing tank, and the filling portion is provided on the other side of the developing tank in the width direction, the other side is apart from the developer carrier.
Abstract: An image forming apparatus includes an image holding member, a charging device that charges a surface of the image holding member and includes a charging member disposed in contact with the surface of the image holding member, an exposure device that forms a latent image by exposing the charged surface, a developing device that forms a toner image by developing the latent image with toner, and a transfer device that transfers the toner image formed to a recording medium. An amplitude Af with a period Lf (mm) satisfying the formula (F?5)?(V/L)?(F+5) is 0.80 ?m or less where F is the natural frequency (Hz) of the exposure device, V is the rotational peripheral velocity (mm/s) of the charging member, and L is the period (mm) in analysis of the circumferential direction period of the surface shape of the charging member.
Abstract: A drive device, which is incorporated in an image forming apparatus, includes a drive motor and a plurality of gears driven by the drive motor. The plurality of gears include at least two gears disposed coaxially with each other and have a plurality of meshing portions. Each meshing portion is formed between a pair of gears of the plurality of gears. A difference between respective gear mesh frequencies of the plurality of meshing portions is set equal to or smaller than 100 Hz.
Abstract: A fixing apparatus including a rotary member in which a generatrix direction thereof is substantially parallel to a generatrix direction of a film, the rotary member being provided between the film and a cover member such that a gap is formed between the film and the rotary member.
Abstract: An image forming apparatus in which an apparatus main body has: an insertion port through which a process cartridge cannot pass when an image bearing member and a developer bearing member are separated from each other and through which the process cartridge can pass when the image bearing member and the developer bearing member are in contact with each other; and guides that guide one of a first frame and a second frame when the process cartridge is inserted into the insertion port. The image forming apparatus has a separation mechanism that separates the image bearing member and the developer bearing member from each other when the process cartridge is further inserted after the other of the first frame and second frame has passed through the insertion port.
Abstract: Provided is an electrophotographic member which can suppress adhesion of the toner component and fogging even in the case of printing a large number of sheets. The electrophotographic member includes an electroconductive support and an elastic layer and has convex portions composed of the elastic layer on a surface of the electrophotographic member and a filled portion containing a resin at a valley portion between the convex portions, the filled portion has a height lower than heights of the convex portions, and the surface of the electrophotographic member has a specific Martens hardness.
Abstract: A fixing device includes an elastic roller and a back-up unit cooperative with the elastic roller to form a fixing nip therebetween, the back-up unit including a cylindrical film contacting the elastic roller, and a heat leveling member contacting an inner surface of the film to cooperate with the elastic roller to form a nip nipping the film. An unfixed toner image is heat-fixed on a recording material at the fixing nip while feeding the recording material carrying the unfixed toner image at the fixing nip. The apparatus feeds the recording material such that the unfixed toner image contacts the elastic roller. The film includes a layer of thermoplastic resin material, and, when the device fixes the unfixed toner image on a small size sheet, a temperature of a non-sheet-passage-part of the film rises to a temperature that is greater than a glass transition point of the thermoplastic resin material.
Abstract: An image forming apparatus includes an image formation unit configured to form an image on a recording material, a conveyance unit configured to convey a recording material, an irradiation unit configured to emit light onto the recording material being conveyed by the conveyance unit, an image capturing unit configured to capture the light emitted by the irradiation unit and reflected from the recording material as a surface image of the recording material, and a control unit configured to control an image forming condition of the image formation unit based on the surface image of the recording material acquired by the image capturing unit, wherein the control unit controls the image forming condition based on a plurality of surface images of the recording material having different resolutions.