Abstract: A gear transmission device includes a drive rotator and a driven external gear. The drive rotator includes a drive internal gear to rotate about a rotary shaft. The driven external gear meshes with the drive internal gear to transmit a drive force to a drive target.
Abstract: An image forming apparatus includes an image information acquisition unit that acquires image information; a toner image formation unit that forms, in response to a control parameter, a toner image on a surface of an image carrier based on the image information; an image density detection unit that produces a detection result indicative of image density of the toner image; and a control unit that determines whether to use a predetermined region in the toner image formed on the surface of the image carrier based on the image information for a detection of the image density of the toner image, and when the predetermined region is determined to be used for the detection of the image density, corrects the control parameter used by the toner image formation unit based on the detection result so as to maintain the image density in the predetermined region within a predetermined range.
Abstract: A fixing device thermally fixes an unfixed image onto a sheet through heat of a heating body that is heated through electromagnetic induction, the fixing device including an excitation coil generating flux for heating the heating body; one or more core members disposed opposite the heating body with respect to the excitation coil; a thermo-electric conversion element disposed farther from the excitation coil than the core members; and a thermally conductive member connected to the excitation coil and to a heat-absorbing face of the thermo-electric conversion element, transferring heat from the excitation coil to the thermo-electric conversion element.
Abstract: A fixing device includes a fixing rotator formed into a loop and rotatable in a predetermined direction of rotation and a pressure rotator disposed outside the loop formed by the fixing rotator and pressed against the fixing rotator to form a fixing nip therebetween through which a recording medium bearing a toner image is conveyed. A stay is disposed opposite the pressure rotator via the fixing rotator. A heater is disposed opposite an inner circumferential surface of the fixing rotator to heat the fixing rotator. A pressurization member is pressed against the heater via the fixing rotator. A housing is interposed between the stay and the heater. A temperature detector is mounted on the housing to detect a temperature of the heater.
Abstract: An image forming apparatus includes an intermediate transfer belt that is stretched by multiple rollers, the intermediate transfer belt transporting a toner image on an outer peripheral surface, a second transfer member that performs second transfer, the second transfer transferring the toner image on the intermediate transfer belt to a recording medium, an opposed member that abuts against an inner peripheral surface of the intermediate transfer belt, the opposed member being opposed to the second transfer member, and a changing section that changes a width of contact between the intermediate transfer belt and the second transfer member at a second transfer position, on a basis of paper attribute information of the recording medium, the second transfer position being a position where the second transfer member abuts against the opposed member with the intermediate transfer belt being sandwiched between the second transfer member and the opposed member.
Abstract: An image forming apparatus includes an image forming unit including a photosensitive drum configured to rotate about a rotation axis of the photosensitive drum, a resin frame configured to support a first end of the image forming unit in an axial direction of the photosensitive drum, a sub frame supported by the resin frame, a board supported by the sub frame and configured to supply a high voltage to the image forming unit, and a springy electrode disposed on the board and apart from edges of the board such that the springy electrode is compressed between the image forming unit and the board. The sub frame includes a plurality of first support portions disposed to support the board at at least three support points and a plurality of second support portions disposed to be supported by the frame at at least three support points.
Abstract: An image forming apparatus includes a slidingly-rubbing roller abutting a surface of a photoconductive drum; a temperature detection section; a humidity detection section; and a heating control section. When the humidity detected by the humidity detection section is equal to or higher than a first threshold humidity and the temperature detected by the temperature detection section is equal to or higher than a threshold temperature, the heating control section heats and dries the surface of the photoconductive drum by a heat generator, while in a case when the humidity is equal to or higher than the first threshold humidity and the temperature is less than the threshold temperature, the heating control section polishes the surface of the photoconductive drum by the slindingly-rubbing roller with a polishing agent contained in a toner and heats and dries the drum surface by frictional heat generated from the polishing.
Abstract: In accordance with one embodiment, a fixing device comprises an induction current generating section, a heating section and an auxiliary heating section. The induction current generating section generates induction current. The heating section generates heat through the induction current. The auxiliary heating section increases the calorific value of the heating section based on the induction current as it is moved closer to the heating section, but does not generate heat itself through the induction current.
Abstract: An image forming apparatus includes an image carrier, an image forming unit for forming a patch image on the image carrier, a light emitting unit, a plurality of light receiving units adjacently arranged so as to receive light reflected from the patch image when light is irradiated by the light emitting unit onto the patch image which moves with movement of the image carrier and each including one or more light receiving elements, and an output unit for outputting an output signal that depends on a difference between a received light quantity of a first light receiving unit and a received light quantity of a second light receiving unit that are respectively odd-numbered and even-numbered in the arrangement order of the light receiving units.
Abstract: An image forming apparatus is provided with a casing, a drum unit including a photoconductive drum having a central axis extending in a first direction, and a charging device configured to charge the photoconductive drum, a fixing unit configured to fix an image on a printing medium, a fan configured to generate an air flow inside the casing, a filter configured to remove ozone included in the air, a first channel defined in the casing, the air directed from the fixing unit toward the fan flowing in the first channel, a second channel defined in the casing, the air directed from the charging device toward the fan flowing in the second channel, the filter being provided in the second channel, the second channel being arranged next to the first channel, and a blocking member configured to block communication between the first channel and the second channel.
Abstract: A developer collecting device includes a suction duct, a collecting box, and a suction mechanism. The suction duct has one end adjacent to a development device and another end. The collecting box is connected to the other end and configured to suction and collect developer around the development device via the suction duct. The suction mechanism is disposed in the middle of the suction duct. The suction mechanism includes a suction port that is openable and closable. The suction mechanism is configured to suction the developer inside the suction duct from an outside of the suction duct.
Abstract: A fixing device includes a fixing belt, a pressuring rotation body, a drive source, a heat source, detected members, rotation detecting parts, a storing part and a controlling part. The storing part stores standard condition for occurrence difficulty of a slip between the fixing belt and detected members co-rotated with rotation of the fixing belt. The controlling part stops heating of the fixing belt by the heat source on a condition that both rotation detecting parts do not detect the rotation of the detected members within a first time when the drive source rotates the fixing belt in a situation unsatisfying the standard condition. The controlling part stops the heating on a condition that at least one of the rotation detecting parts does not detect the rotation of the detected members within a second time when the drive source rotates the fixing belt in a situation satisfying the standard condition.
Abstract: In an image forming apparatus, a control unit causes an image forming unit to form a positional deviation correction pattern, to sandwich a black developer image between two color developer images of a same color, and to superpose the black developer image on one of the two color developer images of the same color in a state where color deviation occurs between developer images of a plurality of different colors.
Abstract: A developing device to supply toner in a developer, including a development member which receives the developer on an outer circumferential surface thereof and supplies the toner to the image bearing member, a first regulation member including a first regulating portion that forms a first doctor gap between the outer circumferential surface of the development member and the first regulating portion, and a second regulation member disposed on an upstream side of the first regulation member in a rotational direction of the development member and includes a second regulating portion that forms a second doctor gap between the outer circumferential surface of the development member and the second regulating portion, the second doctor gaps at a central portion and both end portions in a longitudinal direction of the development member being different from each other.
November 2, 2012
Date of Patent:
December 29, 2015
SAMSUNG ELECTRONICS CO., LTD.
Mitsuru Oikawa, Sang-don Lee, Jong-pil Jun
Abstract: There is provided a grinding roller for use in a fixing device including a pair of rotary fixing members that rotate while being pressed against each other to form an area of contact, and heat and press a recording medium carrying an unfixed toner image and fed to the area of contact, to thereby fix the unfixed toner image on the recording medium. The grinding roller is configured to grind a surface of a toner image-side rotary member of the pair of rotary fixing members that comes into contact with the unfixed toner image. The grinding roller includes an abrasive grain layer including abrasive grains, forming a surface layer of the grinding roller, and having a surface with irregularities including projections each formed by an aggregate of some of the abrasive grains and larger in size than each of the abrasive grains and recesses formed between the projections.
Abstract: An image forming apparatus, including an image forming unit comprising a photosensitive drum configured to be rotatable about a rotation axis and a developer device configured to supply a developer agent to the photosensitive drum; a first frame made of a resin and formed in a shape of a plate, while the first frame is arranged on one end, along an axial direction of the rotation axis of the photosensitive drum, of the image forming unit; and a first beam made of a metal and formed in an elongated shape, while the first beam is arranged along and fixed to a planar face of the first frame, is provided. The first beam is arranged to overlap the image forming unit at a longitudinal central part thereof, when projected along the axial direction, while longitudinal ends of the first beam are arranged on outer sides of the image forming unit.
Abstract: When secondary-transfer residual toner adheres to a brush member, the secondary-transfer residual toner is concentrated on an end of the brush member and it is difficult to uniformly charge the secondary-transfer residual toner. The secondary-transfer residual toner can be recovered to the roots of conductive fibers of the brush member by satisfying the relationship Rb?Ri, where Rb (?) is a resistance value of the brush member and Ri (?) is a resistance value of an intermediate transfer member in an area where the intermediate transfer member is in contact with the brush member.
Abstract: Image forming apparatus includes a movable image bearing member, a first image forming unit, a second image forming unit, a detection member, an execution unit and an adjustment unit. A toner image for adjustment formed on an upstream photoreceptor is made to pass a photoreceptor while facing an area exposed by a downstream image forming unit and is detected by a detection unit.
Abstract: A powder container includes a powder chamber for containing powder for forming images, a powder outlet formed in a face of the powder container, and a shutter assembly to open and close the powder outlet and including first and second shutters. The first shutter is movable between a sealing position to close the powder outlet and an open position to open the powder outlet and includes a pressed member to cancel retention of the first shutter at the sealing position. The second shutter includes a pressing projection that interferes with the pressed member of the first shutter and is movable between a shielding position to cover the pressed member without interference between the pressing projection and the pressed member and a releasing position to press the pressed member with the pressing projection.
Abstract: An image forming apparatus for forming an image on a recording material includes a detachably mountable cartridge and a pressing member movable between a pressing position for applying a pressing force to the cartridge to fix the cartridge to an image forming position and a non-pressing position. In addition, a limiting member moves between a limiting position and a non-limiting position. In the limiting position, the limiting member is close to the cartridge placed in the image forming position, with a gap therebetween to limit movement of the cartridge if the cartridge moves against the pressing force of the pressing member. The limiting member permits the cartridge to move from the image forming position to a retracted position, by moving from the limiting position to the non-limiting position.