Abstract: An image forming apparatus includes an image forming portion including a photosensitive member and a developing portion, a sheet accommodating portion, a sheet feeding portion, and a first frame. The first frame includes an upper space supporting the image forming portion, and a lower space under the upper space. A second frame is mountable to a lower portion of said first frame. The accommodating portion and the feeding portion are replaceable with a supply container containing toner to be supplied to a developing portion of the image forming portion, in which the second frame supports the accommodating portion and the feeding portion.

Abstract: An image forming apparatus includes a cassette to store a recording medium, an image forming unit to form an image on an image bearing member based on an image forming condition, a transfer unit to transfer the image onto the recording medium conveyed from the cassette, and a reading unit to read a test image formed on the recording medium by the image forming unit. A controller controls the image forming unit to form the test image while the image forming unit is forming a plurality of images, controls the image forming condition based on a reading result of the test image by the reading unit, and obtains information related to basis weight of the recording medium in the cassette. In a case where the information does not satisfy a forming condition for forming the test image, the test image is not formed.

Abstract: In one example in accordance with the present disclosure, a developer unit seal is described. The seal includes a first sealing member to contact an end cap of the developer unit. The first sealing member has ports to align with rollers that are to protrude into the end cap. The seal includes a second sealing member to contact the first sealing member. The second sealing member has ports to align with the rollers. Channels are disposed between the first sealing member and the second sealing member to direct print fluid to each of the ports.

Abstract: According to examples, a toner refill apparatus may include a chamber to house a toner, in which the chamber may include an insertion section, the insertion section to be inserted into a refill port of a toner cartridge and including a discharge opening, the refill port including an electrical circuit component. The apparatus may also include a valve mechanism positioned at the discharge opening to control output of the toner from the chamber through the discharge opening, in which an actuator may engage the valve mechanism and may controllably open the valve mechanism. The apparatus may further include an electronic chip to be in electrical communication the electrical circuit component, in which a controller may activate the actuator based on a detection that the electronic chip is in contact with the electrical circuit component.

Abstract: An image forming apparatus includes first and second image forming portions provided with first and second image bearing members, respectively. A controller controls a first operation in which the image to be transferred to the recording material is formed only in the first image forming portion, a second operation in which the image to be transferred is formed in the first and second image forming portions, and a supplying operation in which a lubricant is attached to the second image bearing member and supplied to a contacting portion of the second image bearing member. In a case that a stopping time exceeds a predetermined threshold when a start instruction of the first operation is input in a stopping state of the first and second image bearing members, the controller controls to execute the supplying operation during a time from when a current start instruction of the first operation is input until a next start instruction of the first or second operation is input.

Abstract: An imaging system includes a lubricant roller to transfer a lubricant to the image carrier, a solid lubricant in contact the lubricant roller to supply the lubricant to the lubricant roller, and a pressing member to urge the solid lubricant against the lubricant roller. The lubricant roller includes a foam that is in contact with the image carrier. The foam is selected to have a permeability of approximately 0.15 dm3/s to 1.4 dm3/s.

Abstract: An image forming apparatus which can be replenished with toner using a replenishment cartridge and communicates with a memory device of the replenishment cartridge via a first electric contact portion and a second electric contact portion after a replenishment cartridge is attached to the image forming apparatus in an installation portion. The replenishment cartridge is prevented from being detached by a regulation unit when it is in the replenishment position.

Abstract: A method of converting a CMYK Standard Color Printer to print with a white toner such that a CMYW Converted White Printer is created. The CMYK Standard Color Printer may be an Oki® printer, such as C821dn, C822n, C823dn, C830n, C830dn, C831DM, C831n, C831dn, C833dn, C841dn, C843dn, or C844dnw.

Abstract: An image forming apparatus is configured to allow a replenishment container to be detachably attached thereto. The image forming apparatus includes a drum unit including a photosensitive drum, and a development unit. The development unit includes a development roller, a reception portion configured to receive the replenishment container. The development unit is movable relative to the drum unit. The image forming apparatus further includes a housing including an opening/closing member movable between a cover position, at which the opening/closing member covers the reception portion, and an exposing position, at which the reception portion is exposed, and a support member configured to be movable between a support position, at which the support member supports the development unit, and a retracted position, at which the support member is retracted from the support position, in conjunction with the movement of the opening/closing member.

Abstract: A device configured to fix toner to a sheet including a tubular body, a heater, and a heat conduction section. The tubular body is configured to be in contact with a sheet moving in a first direction. The heater includes a heat generator. The heater includes a first surface and a second surface on the opposite side of the first surface. The first surface of the heater is in contact with the inner surface of the tubular body. The heat conduction section is in contact with the second surface of the heater. The heat conduction section includes a first heat transfer section and a second heat transfer section. The first heat transfer section is in contact with the second surface of the heater. The second heat transfer section is in contact with the surface opposite to the heater with respect to the first heat transfer section.

Abstract: An image forming apparatus including: a first door rotatable about a first rotation axis extending in a width direction within a first rotation range between a first open position and a first closed position; a second door provided below the first door and rotatable about a second rotation axis extending in a direction orthogonal to the first rotation axis within a second rotation range between a second open position and a second closed position, a part of the first rotation range making inroads into the second rotation range; and a retracting portion configured to rotate the first door to a retracted position to allow a rotation of the second door in conjunction with the second door being rotated to the second closed position from a state in which the first door is in the first open position and the second door is in the second open position.

Abstract: An absolute value of a first maximum value is smaller than an absolute value of the second maximum value. With respect to a rotational direction of a rotatable developing member, an angle from a second maximum position to a position where a magnetic flux density of a regulating pole in a normal relative to an outer peripheral surface of the rotatable developing member is a half value of the second maximum value on a side downstream of the second maximum position is smaller than an angle from a position where the magnetic flux density of the regulating pole in the normal direction relative to the outer peripheral surface of the rotatable developing member is a half value of the first maximum value on a side upstream of the first maximum position to the first maximum value.

Abstract: A method for attaching a sheet member to a cylinder body includes: preliminarily fixing a first end portion of the sheet member to a first fixation portion of a cylinder body provided in an apparatus body and having a substantially circular cross section; wrapping the sheet member around the cylinder body by rotating the cylinder body; fixing the first end portion and a second end portion of the sheet member to the first fixation portion and a second fixation portion, respectively; and installing an installation member between the apparatus body and an inner surface of the sheet member before the wrapping of the sheet member around the cylinder body.

Abstract: A heater includes electrodes and heating element pieces. The electrodes energize the heating element pieces with electricity. The heating element pieces are connected to the electrodes and arranged through a gap portion in the heater in a main scanning direction. A ratio of a second surface area of the gap portion to a first surface area of the heating element pieces is 0<(second surface area of the gap portion)/(first surface area of the heating element pieces)?0.5.

Abstract: An image forming apparatus includes a conveying unit, an image forming unit, a fixing unit, a first driving unit, a second driving unit, a transmission unit to transmit an ultrasonic wave, and a reception unit. Where a determination is made that a timing at which excitation of the first driving unit is switched or a timing at which excitation of the second driving unit is switched overlaps with a timing to obtain a value of the ultrasonic wave received by the reception unit, the transmission unit does not transmit an ultrasonic wave. Where a determination is made that the timing at which the excitation of the first driving unit is switched or the timing at which the excitation of the second driving unit is switched does not overlap with the timing to obtain the value of the received ultrasonic wave, the transmission unit transmits an ultrasonic wave.

Abstract: An image forming apparatus includes: a circulating member that is a part of a transport path that transports a recording medium; a holding member that is fixed to the circulating member, circulates, and holds a leading end portion of the recording medium; an image forming section that forms an image on the recording medium at an image forming position in a circulation path of the circulating member; and a feeding section that feeds out the recording medium to a holding position where the holding member holds the leading end portion of the recording medium. When a circulation velocity Vg is defined as a velocity at which the circulating member circulates the holding member, a transport velocity of the recording medium is reduced from a first transport velocity V1, which is higher than the circulation velocity Vg, to a second transport velocity V2, which is lower than the first transport velocity V1, before the leading end portion of the recording medium enters the holding position.

Abstract: An image forming apparatus including a developing unit with a developing container configured to contain a developer including a toner and a carrier, and configured to develop the electrostatic latent image by using the developer in the developing container. A sensor, which is provided on an outer wall of the developing container, is configured to output a pulse signal that changes in frequency depending on a toner concentration of the developer in the developing container. A controller is provided to control supply of the toner to the developing unit by detecting the toner concentration based on the time required for the pulse number to reach a predetermined count number.

Abstract: An image forming apparatus includes an image forming unit, a fixing unit, a plurality of exterior covers forming an exterior of the image forming apparatus, a fan configured to suck outside air into the image forming apparatus through an air intake port, a temperature sensor configured to detect a temperature of the outside air sucked by the fan, and a partition member disposed upstream the temperature sensor and downstream the air intake port in an airflow generated by the fan, the partition member dividing an air intake path through which the outside air sucked through the air intake port passes into a first path passing through a fixing unit side and a second path passing through a temperature sensor side.

Abstract: An image forming apparatus includes a transfer belt and a plurality of image forming units. The image forming unit includes a photosensitive drum and a charge elimination part. The charge elimination part of a predetermined image forming unit irradiates a downstream area of the primary transfer position on the photosensitive drum of the predetermined image forming unit with post-transfer charge elimination light and irradiates an upstream area of a primary transfer position on the photosensitive drum of the other image forming unit disposed on a downstream side of the predetermined image forming unit in the conveyance direction. A slit part is provided between the predetermined image forming unit and the other image forming unit for narrowing an irradiation width of the pre-transfer charge elimination light in a circumferential direction of the photosensitive drum.

Abstract: An image forming apparatus includes an apparatus body, a sheet supporting portion, a sheet feeding portion configured to feed a sheet supported on the sheet supporting portion, a sheet regulation portion configured to regulate a position of the sheet in a width direction, an image forming portion including an exposing portion configured to expose a charged surface of an image bearing member, the image forming portion being configured to form an image on the sheet fed by the sheet feeding portion, and a frame member provided inside the apparatus body. A position of the exposing portion is determined with respect to the frame member. A position of the sheet regulation portion is determined with respect to the frame member.