Abstract: An image forming apparatus includes an insertable developing apparatus having a developer container, a developer discharging portion, and a shutter movably arranged between a closing position and an opening position. A first spring joins with the shutter and urges the shutter in an insertion direction in which the developing apparatus is inserted to the image forming apparatus so the shutter is maintained at the closing position, and a fixing member is detachably attached to the developing apparatus and fixes the shutter at the closing position. An attachment portion in the developing apparatus attaches to the fixing member, an engagement member engages with the shutter, and a second spring joins with the engagement member and urges the engagement member in a direction opposite to the insertion direction.
Abstract: A conveying screw configured to convey a toner in an axial direction includes a conveying shaft part and a conveying blade. The conveying shaft part is configured to be rotated around an axis. The conveying blade is spirally formed around an outer circumferential face of the conveying shaft part and configured to convey a toner in a replenishment path. At least one spiral of the conveying blade is formed by two semicircular blade plates which are coupled to in postures inclined in opposite directions to each other. A through hole through which the toner is passed in the axial direction is formed in an area surrounded by the conveying shaft part and the two blade plates.
Abstract: A developing device includes a developer carrier that carries a developer to be supplied to an image carrier that forms an electrostatic latent image, a supply unit that supplies the developer containing toner and a carrier to the developer carrier by transporting the developer while agitating the developer along a circulation path formed through rotation of each of plural rotary members, and a delivery unit that receives a collected developer, which is the developer collected from the developer carrier, transports the collected developer by another rotary member different from the plural rotary members of the supply unit, and delivers the collected developer to the circulation path of the supply unit.
Abstract: A toner replenishing apparatus includes: a toner storage that stores toner for replenishment; an agitation paddle that is arranged in the toner storage and rotates to agitate toner stored in the toner storage; a conveyance member that is disposed in a lower part of the toner storage and is used to convey the toner stored in the toner storage toward a developer; and an agitation member that moves along with rotation of the agitation paddle, wherein the conveyance member is arranged away from the agitation paddle in a plan view, and the agitation member agitates the toner located above the conveyance member, which is a part of the toner stored in the toner storage.
Abstract: According to one embodiment, a developing device includes a developer storage unit, a toner supply unit, a magnet roller, a first stirring screw, and a second stirring screw. The developer storage unit is configured to be made to be able to circulate and convey a developer. The toner supply unit supplies a toner to the developer storage unit. The magnet roller adsorbs the developer. The first stirring screw conveys the developer from a second opening portion to a first opening portion along a longitudinal direction. The second stirring screw includes a rotating shaft, a screw, a paddle, and a protrusion. The screw conveys the developer from the first opening portion to the second opening portion along the longitudinal direction by rotation. The paddle protrudes from the rotating shaft to a lateral side. The paddle stirs the developer by rotation. The protrusion protrudes from the paddle in the rotating direction.
Abstract: A developing device includes a developer container configured to accommodate a developer containing toner and a carrier and a feeding screw provided rotatably in the developer container and configured to feed the developer in a predetermined feeding direction. The feeding screw includes a rotation shaft, and a first helical blade and a second helical blade which are formed around the rotation shaft and which form a multi-thread helical blade. The feeding screw includes a region in which a plate-like projection portion is provided on the rotation shaft between the first helical blade and the second helical blade.
Abstract: A developer container includes a containing device, a support member, and a crumbling device. The containing device contains developer therein and is rotated so as to transport the developer. The support member supports the containing device such that the containing device is rotatable. The support member has an outlet through which the developer transported by the containing device flows out. The crumbling device is supported such that the crumbling device is rotatable together with the containing device. The crumbling device is, when the containing device is rotated, rotated so as to crumble the developer. The crumbling device includes a body portion and an applying member. The body portion extends from a region near the containing device toward the outlet. The applying member is formed in the body portion. The applying member applies a force for transporting the developer toward the outlet when the crumbling device is rotated.
Abstract: A developing device includes a rotating member that delivers developer to a latent image on an image carrier while rotating; a supplying member provided in a supply path extending in an axial direction of the rotating member; a stirring member including a stirring shaft extending in the axial direction and provided in a stirring path extending in the axial direction and arranged side by side with the supply path in a direction intersecting the axial direction, the stirring member stirring the developer while rotating by causing the developer to circulate between the supply path and the stirring path; and a preliminary member provided in a preliminary stirring path into which toner is supplied from an outside and provided by extending an end of the stirring path that is on a side where the developer delivered from the supply member is received by the stirring member, the preliminary member including an extension shaft as an extension of the stirring shaft and a helical transporting blade provided on the extens
Abstract: A developing device includes a developer carrying member, a first chamber, a second chamber, a first communicating portion, a second communicating portion, and a feeding screw, provided in the second chamber, including a feeding portion having a first helical blade and including a returning portion having a second helical blade in the form of a plurality of threads, the feeding portion and the returning portion being provided so that a boundary portion therebetween opposes the second communicating portion. The first helical blade and the second helical blade satisfy the following relationship: P2?P1, where P1 is a pitch, or lead, of the first helical blade and P2 is a lead of the second helical blade.
Abstract: The present disclosure provides a developer container including a developer supplying box and a developer containing box. A first gear is rotatably connected to the developer supplying box, and a rotating shaft is inserted into the first gear; first stirring blades are fixed to two sides of the rotating shaft, and a second stirring blade is fixed at the rotating shaft; a first sliding cover is sleeved on the developer supplying box, and a sliding cover powder outlet is disposed on the first sliding cover; a supply box powder outlet is disposed on the developer supplying box; the first gear is engaged with a second gear, the second gear is engaged with a third gear, the third gear is engaged with a fourth gear, and the fourth gear is engaged with a fifth gear; and a screw feeding rod is inserting into the fifth gear.
Abstract: A toner case includes a case main body, first and second agitators, and a transmitting mechanism. The case main body is configured to store a toner. The first and second agitators are configured to rotate and to agitate the toner in the case main body. A transmitting mechanism is configured to transmit rotation to the first and second agitators. The transmitting mechanism stops transmission of the rotation to the second agitator while the transmitting mechanism continues the transmission of the rotation to the first agitator, when driving torque of the second agitator is equal to or more than a first set value.
Abstract: A developing device includes a developer cartridge and a developing unit. The developer cartridge, in some instances, may include a shutter. This shutter may have a wall for closing a developer supply hole, and be movable, with respect to a developer cartridge casing, between an open position where the supply hole is opened by the wall and a closed position where the supply hole is closed by the wall. The shutter may further include a protrusion that is movable with respect to the wall of the shutter between a first position and a second position in an axial direction. The protrusion, in the first position, is engageable with a developing unit and, in the second position, would be disengaged from the developing unit.
January 25, 2019
Date of Patent:
March 24, 2020
Brother Kogyo Kabushiki Kaisha
Masahiko Hayakawa, Masashi Imai, Shougo Sato
Abstract: A toner case includes a case main body, a rotator, a transmitter and a lock member. The case main body is configured to store a toner. The rotator is stored in the case main body and configured to rotate around a rotation axis. The transmitter is configured to transmit rotation to the rotator. The lock member is attached to the transmitter and configured to rotate integrally with the transmitter. The lock member is movable between a lock position where rotation of the lock member with respect to the case main body is restricted and a lock release position where the rotation of the lock member with respect to the case main body is allowed.
Abstract: A device that replenishes developer to a developer unit and includes a storage for storing developer, an agitation member, and a vibration plate. The agitation member has a blade shape and is rotationally driven to agitate the developer in the storage. The vibration plate extends from a top portion towards a bottom portion of the storage along a rotation direction of the agitation member, and includes a vibration portion that vibrates due to contact with the agitation member undergoing rotation. A top end of the vibration plate is fixed and a bottom end of the vibration plate is a free end, and there is a gap between the vibration portion and an inner wall of the storage. The vibration plate is provided with an engagement protrusion towards the free end that engages with the agitation member and causes the agitation member undergoing rotation to deform then spring back.
Abstract: A developer supplying device for supplying a developer to a subject to be supplied includes: a housing; and a stirring member rotatable around a rotational axis in the housing, wherein the stirring member includes: a main body that includes a flexible sheet, extends away from the rotational axis, and is in contact with an inner wall surface of the housing; and a cut part formed in the main body, and the cut part projects from the main body when the main body is bent along with rotation of the stirring member.
Abstract: An image forming apparatus includes image bearers, developing devices, developer containers, and developer supply devices. The image bearers are arranged side by side along a movement direction of an intermediate transferor or a sheet. The developing devices, the developer containers, and the developer supply devices are configured to be rearrangeable for each color in the movement direction in a manner that one or each of a developing device, a developer container, and a developer supply device corresponding to each color of the different colors is detached from and attached to the image forming apparatus, separately from a rest of the developing device, the developer container, and the developer supply device. The image forming apparatus is configured to be available for use when colors of the developing device, the developer container, and the developer supply device correspond to each other after rearrangement.
Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, a polycarbonate resin, and a hole transport material. The electron transport material includes a compound having a halogen atom and represented by general formula (1), (2), (3), (4), or (5). The hole transport material includes a compound represented by general formula (20), (21), (22), (23), (24), (25), (26), or (27). A charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer is at least +6.5 ?C/g. A Vickers hardness of the photosensitive layer at 45° C. is at least 17.0 HV.
Abstract: A developing device is provided which includes: a developing roller in contact with or facing an image bearer; a supply roller to supply toner to the developing roller; a casing; a first conveyer disposed within the casing and above the supply roller to supply toner stored in the developing device to the supply roller, while forming a first conveyance path; a second conveyer disposed within the casing with an upper end thereof positioned below that of the first conveyer, while forming a second conveyance path forming a toner circulation path together with the first conveyance path; a partition wall separating the first conveyance path and the second conveyance path in a longitudinal direction within a range excluding both longitudinal end portions; and a toner supply port, at a ceiling of the casing above the second conveyance path, through which toner is supplied to an inside of the developing device.
Abstract: An image forming apparatus includes a printing device, an ultrasonic sensor, and a controller. The printing device to which a toner container is mounted is configured to perform printing using toner in the toner container. The ultrasonic sensor arranged so as to correspond to a mounting position of the toner container is configured to (a) output an ultrasonic wave to a specific position of the toner container, (b) detect the ultrasonic wave that passes through the toner container, and (c) output a detection signal corresponding to an intensity of the detected ultrasonic wave. The controller is configured to determine whether the toner container is a genuine product or not on the basis of a level of the detection signal of the ultrasonic sensor when the toner container is mounted.
Abstract: A developing apparatus includes a developer carrier configured to carry developer, a developer container having a first chamber and a second chamber, a first conveying member provided in the first chamber, and including a first conveying unit and, on a downstream side in a first direction, a reverse conveying unit, a second conveying member, a discharge unit configured to discharge the developer, and a partition wall having a first communication port and a second communication port and configured to partition the first chamber and the second chamber. In addition, a plurality of protruding portions are provided so as to oppose the first conveying member at a position above a region between the first conveying unit and the reverse conveying unit in a vertical direction, each of the protruding portions extending along the first direction, wherein the plurality of protruding portions are arranged in a row in a direction orthogonal to the first direction.
Abstract: A developing device includes a developing agent carrier body that carries a developing agent; a supplier that has a plurality of movement areas for moving the developing agent and that supplies the developing agent to the developing agent carrier body; a confluence path that combines the developing agent moving in each of the plurality of movement areas and thereafter returns the developing agent to the plurality of movement areas; and a mixing member that mixes the developing agent entered in the confluence path.
Abstract: A feeding screw for feeding a developer includes a rotation shaft, and a helical blade provided on the rotation shaft and including a plurality of threads. The helical blade includes a first blade helically formed with a single thread on the rotation shaft, a second blade helically formed with a single thread on the rotation shaft, and a third blade helically formed with a single thread on the rotation shaft. With respect to a direction along the rotation shaft, a gap is provided between a downstream end portion of the second blade and an upstream end portion of the third blade. A volume of the second blade is not more than 75% of the first blade between an upstream end portion of the second blade and the upstream end portion of the third blade with respect to the direction.
Abstract: A developing device includes: a developing roller that carries a developer; a developing tank that supplies the developing roller with the developer replenished from a replenishing port; a discharger that has a discharge port connecting to the developing tank and discharges the developer from the developing tank; a supply amount acquirer that acquires a supply amount of the developer to be supplied to the developing tank; a discharge amount acquirer that acquires a discharge amount of the developer to be discharged through the discharge port; a developer amount adjuster that adjusts an amount of the developer in the developing tank; and a hardware processor that controls the developer amount adjuster to adjust the amount of the developer in the developing tank to a value within a predetermined range, in accordance with the acquired supply amount and the acquired discharge amount of the developer.
Abstract: A toner case includes a case main body and an agitator. The case main body stores a toner. The agitator rotates around a rotation axis extending along one direction and agitates the toner stored in the case main body. The case main body includes a curve and a recess. The curve is curved in an arc shape around the rotation axis. The recess is recessed from the curve toward a side remote from the rotation axis. In a state where the agitator is in a first rotating position, a part of the agitator comes into contact with an inner circumferential face of the curve so that the part of the agitator is in a bent state. In a state where the agitator is in a second rotating position, the part of the agitator is inserted into the recess.
Abstract: A developing apparatus includes a developer carrier that carries a developer, and a developer casing that contains the developer to be supplied to the developer carrier. An opening/closing part is capable of controlling a moving amount of the developer between a first region on one side in an axial direction of the developer carrier and a second region on the other side in the axial direction of the developer carrier by opening or closing the first region and the second region. A hardware processor controls an open/closed state of the opening/closing part in accordance with the state of the developer in the first region and the second region.
Abstract: In an image forming device including a volume supply type developing device, generation of an aggregate of a developer on a back surface of a layer thickness regulating member is suppressed, while occurrence of an image failure caused by the aggregate is suppressed. An image forming device includes: a photosensitive drum; a developing device including a developing roller; a toner container including a toner sensor; and a control portion. According to an increase or decrease of a retention part formed in a first transport path, a toner flows into the developing device from the toner container. The control portion causes the developing roller to reversely rotate at predetermined timing when the toner sensor senses that a residual amount of a toner in the toner container falls below a predetermined threshold value.
Abstract: A developer container includes a container main body having an internal space and a developer discharge port; a movable wall moving in the internal space toward the developer discharge port; a detection surface which is a part of an inner peripheral surface that divides a storage space of a developer in the container main body and which becomes a detection region of a first detection sensor which detects the developer in the storage space; and a rotating body arranged in the storage space and capable of rotating around a rotary shaft along the first direction. The rotating body is mounted with a cleaning member which cleans the detection surface, a stirring member which stirs a developer in the storage space, and a detection target member to be a detection target of a second detection sensor which detects presence of the container main body.
Abstract: A developing device of an image forming apparatus includes a casing, two-component developer accommodated in the casing, and a stirring screw for conveying and stirring the developer in the casing by rotation in a predetermined direction. The image forming apparatus includes a toner concentration sensor that outputs a value indicative of the toner concentration of the developer in the casing. The image forming apparatus determines whether or not the developer in the casing has become uniform, based on the amount of change per unit time of the output value of the toner concentration sensor, acquired after the stirring of the developer in the casing by the stirring screw is started. It is possible to appropriately measure the reference value of the toner concentration.
Abstract: A developing device includes a hardware processor that performs control in which a developer circulation state is switched between a first state and a second state depending on states of the developer in the first and the second regions. The first state is a state in which a developer circulation path is formed in each of the first and the second regions, and the second state is a state in which a single developer circulation path is formed all through the first and the second regions.
Abstract: A transport member, that transports a developer by rotating in a rotation direction that is predetermined around a rotation axis, includes: a shaft part including the rotation axis; and a blade part spirally provided on an outer peripheral surface of the shaft part, wherein the blade part includes a transport surface that is a surface facing a downstream side in a transport direction of the developer along the rotation axis, and a non-transport surface that is a surface other than the transport surface, and the transport member further includes a fin protruding from the non-transport surface of the blade part, the fin being provided with an interval from the outer peripheral surface of the shaft part.
Abstract: A developing apparatus includes: a developer carrying member carrying a developer; a plurality of developer feeders accommodating the developer carried by the developer carrying member and being arranged in an axial direction of the developer carrying member; and a collecting part that collects the developer from the developer carrying member and feeds the developer to a second developer feeder different from a first developer feeder located at a position where the developer is collected from the developer carrying member in the axial direction, among the plurality of developer feeders.
Abstract: A developing device includes a developing container including a first conveyance chamber and a second conveyance chamber disposed above the first conveyance chamber, a first stirring-conveyance member which conveys developer in the first conveyance chamber in a first direction, a second stirring-conveyance member which conveys the developer in the second conveyance chamber in a second direction opposite to the first direction, and a developer carrier. A second communication portion is formed which allows the first and second conveyance chambers to communicate with each other at their end portions on a downstream side in the second direction. In the first conveyance chamber, a guide member is disposed which guides, to the downstream side in the first direction, the developer passing through the second communication portion to fall into the first conveyance chamber.
Abstract: A developing device includes a housing including a container that holds a developer containing toner and a magnetic carrier, a feed port member that allows toner or a magnetic carrier to pass therethrough to be fed into the container, a rotary member spaced apart by a gap from a surrounding portion of the housing including the feed port member, the rotary member transporting the developer while holding the developer on an outer circumferential surface of the rotary member to cover the gap when a developer level of the developer inside the container exceeds a reference level, and a developer-level adjusting magnetic pole that holds the developer and that is located at the same level as an end of the gap located downstream from the feed port member in a rotation direction of the rotary member or located downstream from the end of the gap in the rotation direction.
Abstract: A developing cartridge includes a lever, an urging member, a first gear, a second gear, and a protrusion rotatable together therewith. The lever is movable between a first position and a second position. The urging member urges the lever toward the first position. The first gear includes first and second gear portions. The second gear portion has an addendum circle greater than that of the first gear portion. The second gear includes a third gear portion engageable with the first gear portion and a fourth gear portion engageable with the second gear portion. The fourth gear portion has an addendum circle smaller than that of the third gear portion. In a case where the second gear rotates while engaging with the fourth gear portion, the protrusion contacts the lever to move the lever from the first position to the second position against urging force of the urging member.
Abstract: A stirring conveyance member includes a rotary shaft, a first spiral blade, and a second spiral blade. The first spiral blade has first cutouts each provided in a specific region adjacent to and upstream of a point of intersection with the second spiral blade in the conveyance direction of the powder by the first spiral blade. The second spiral blade has second cutouts each provided in a specific region adjacent to and upstream of a point of intersection with the first spiral blade in a conveyance direction of the powder by the second spiral blade. A radial height of the first spiral blade in portions where the first cutouts are provided is lower than a radial height of the second spiral blade in portions where the second cutouts are not provided.
Abstract: A developing cartridge includes: a casing; a developer container; a developing roller; an unsealing mechanism; a first rotary body; a second rotary body; and a delayed transmission mechanism. The developer container is sealed to accommodate developer. The unsealing mechanism unseals the developer container. The first rotary body is provided at the unsealing mechanism. A drive force from a drive source is transmitted to the first rotary body and the second rotary body. The second rotary body transmits the drive force to the developing roller. The delayed transmission mechanism delays transmission of the drive force to the second rotary body for at least a prescribed time after transmission of the drive force to the first rotary body is initiated. The prescribed time is equivalent to a time that elapses from a moment the unsealing mechanism begins rotating to a moment the unsealing mechanism has unsealed the developer container.
Abstract: A developing device includes a first communication portion defining a communication path through which developer in a second chamber is communicated to a first chamber. The communication path has a first area and a second area. The first area is positioned within a range corresponding to a developer coating area of a developer bearing member in a conveyance direction of developer in the collection chamber, while the second area is positioned downstream of the developer coating area in the conveyance direction. A first length of the first area is shorter than a second length of the second area. The first length is a maximum length from a bottom surface portion of the communication path to an upper portion of the first area, and the second length is a maximum length from the bottom surface portion of the communication path to an upper portion of the second area.
Abstract: A developing unit includes a developing roller, a developing casing to support and allow the developing roller to rotate, the developing casing including a developer supply inlet, a developer discharge outlet, and a developer collection inlet. The developing unit further includes a discharge cover to form a discharge path for a developer discharged from the developer discharge outlet along with the developing casing. The developer collection inlet is positioned in the discharge path to collect a part of the developer moving along the discharge path into the developing casing.
August 30, 2017
Date of Patent:
November 13, 2018
S-PRINTING SOLUTION CO., LTD.
Mitsuru Oikawa, Dong-uk Kim, Jong-hyun Park
Abstract: A developing device includes a developer bearer, a casing defining an upper compartment to contain the developer and a lower compartment disposed lower than the upper compartment, to contain the developer, and a first conveyor and a second conveyor disposed in the upper compartment and the lower compartment, respectively, to convey the developer in a longitudinal direction of the developer bearer and circulate the developer between the upper compartment and the lower compartment through a first communicating opening, through which the developer is conveyed upward, and a second communicating opening. A developer-lifting range of the upper compartment, which opposes the first communicating opening, is larger in volume than a developer-lifting range of the lower compartment. One of the upper compartment and the lower compartment is disposed adjacent to the developer bearer to supply the developer to the developer bearer.
Abstract: An accommodating container includes: an accommodating chamber, provided with an opening, for accommodating a developer; a seal member for unsealably sealing the opening; and a rotatable member rotatably supported inside the accommodating chamber. The seal member includes a sealing portion for sealing the opening, a connecting portion connected with the rotatable member, and at least one hole provided between the sealing portion and the connecting portion. The rotatable member includes a shaft portion and at least one projection extending in a direction of being spaced from the shaft portion. The hole and the projection are provided to establish a non-overlapping positional relationship with respect to a direction along the shaft portion.
Abstract: According to an aspect of the invention, a developing device includes a developing container that accommodates a two-component developer, a toner concentration detecting unit that detects a toner concentration of the developer by a detecting unit exposed to an inner wall of the developing container, a transport member that is disposed within the developing container and stirs and transport the developer with a transport blade having a pitch that is equal to or less than a size of the detecting unit of the toner concentration detecting unit, and a plurality of gap holding members that is provided at a position facing the toner concentration detecting unit of the transport member and holds a gap such that a tip thereof is abutted against the inner wall of the developing container.
Abstract: A developing device includes a rotary member delivering a developer to a latent image on an image carrier while rotating, a supply member disposed in a supply path and including a supply shaft and a helical or substantially helical supply blade, the supply member supplying the developer to the rotary member while rotating, a stirring member disposed in a stirring path, which extends alongside the supply path, and including a stirring shaft and a helical or substantially helical stirring blade, the stirring member stirring and circulating the developer between the supply and stirring paths while rotating, and an ejection path connected to an upstream portion of the supply path in a transport direction of the developer to eject the developer to the outside. The stirring blade's outer diameter is 1.1 or about 1.1 times or more and 1.5 or about 1.5 times or less the supply blade's outer diameter.
Abstract: A developing device includes a container that contains a developer containing a toner therein, a supply tank that is provided adjacent to the container and is supplied with the toner at a supply point within the supply tank, a transport member that is rotatably driven within the supply tank to transport the toner to the container, and an annular member, wherein the annular member has an inner diameter larger than a diameter of a rotatably-driven shaft in the transport member, the rotatably-driven shaft extends through the annular member, and the annular member is held in a partial section in a longitudinal direction of the rotatably-driven shaft.
November 14, 2016
Date of Patent:
July 31, 2018
FUJI XEROX CO., LTD.
Tatsuhiro Igarashi, Manabu Furuki, Masahiro Uchida, Makoto Kamisaki, Teppei Yawada, Jun Sekiya, Koji Funaba
Abstract: A developing device has a developer container, a first stirring member, and a first stirring chamber. The developer container stores toner. The first stirring member conveys toner while stirring it. The first stirring chamber is in the developer container. The first stirring member is in the first stirring chamber. In a top surface of the first stirring member is a toner supply port through which toner is supplied from outside by action of gravity. The first stirring member has, on the downstream side of the toner supply port in the toner conveying direction, a reduced conveying power portion exerting reduced conveying power to toner. The first stirring chamber has a developer stagnation portion at a position facing the reduced conveying power portion. The inner surface of the developer stagnation portion has a smaller surface roughness than the inner surface of the stirring chamber except for the developer stagnation portion.
Abstract: A developing device includes a housing, a developing roller, a developer conveyance path, a partition plate, a developer supply port and a developer conveying member. The developer conveying member rotates such that an outer peripheral part thereof moves from top to bottom in a first area between a second shaft portion and the partition plate and moves from bottom to top in a second area between the second shaft portion and the side wall. The developer supply port is obliquely open above the second area. The housing includes a first space formed above the second area of the first conveyance path and a second space formed up to a position higher than the partition plate to communicate with the first conveyance path above the first area of the first conveyance path and communicating with the first space in a horizontal direction.
Abstract: A developing apparatus capable of suppressing an excessive discharge of developer from a developer discharge hole is disclosed. A first opening part through which developer is carried from a first case part to a second case part, and a developer discharge hole through which the developer is discharged are provided to the first case part. A first carrying member includes a counter blade between the first opening part and the developer discharge hole. The counter blade carries the developer in an opposite direction to a carrying direction of a first carrying blade of the first carrying member. A gap is prepared between an upper part of the counter blade and the first case part. A cross-sectional area of a discharge path for the developer from the counter blade to the developer discharge hole changes according to a progress of the developer along the discharge path.
Abstract: A developing apparatus includes a developer bearing member, a first chamber to supply the developer to the developer bearing member, and a second chamber to collect the developer having passed through a developing region. A guiding portion is arranged on a partition portion that separates the first and second chambers. The guiding portion guides the developer from the developer bearing member to the second chamber, and is positioned overlapping a communicating portion between the first and second chambers. One end portion of the guiding portion is arranged above an upper end of the partition portion, and the other end portion of the guiding portion is arranged above a rotation axis of a conveyance screw in the second chamber and below an uppermost portion of the conveyance screw while leaving a clearance between the guiding portion and the conveyance screw.
Abstract: An image forming apparatus includes an image bearing member, a developing device which is configured to store developer having magnetic carrier and toner and to develop an electrostatic latent image formed on the image bearing member, and a discharge port which is arranged in the developing device and through which developer is discharged from the developing device. A collection portion is configured to collect the developer discharged through the discharge port, and a discharge conveyance portion is configured to convey the developer discharged through the discharge port to the collection portion. An environment detector is arranged in a conveyance passage of the discharge conveyance portion and is configured to detect environment information, and an adjustment portion is configured to adjust a development condition of the developing device based on output of the environment detector.
Abstract: A toner is provided. The toner includes toner particles each including a binder resin and a release agent. From 20% to 80% by number of the toner particles satisfy the following formula (1) and (2): 2/3?T/Dv?1.5??(1) 1/3?R/Dv?1.0??(2) wherein Dv represents a volume average particle diameter of the toner particles; and T and R represent the longest cross-sectional diameters of each toner particle and the release agent contained therein, respectively, measured by observing cross-sections of the toner particles with scanning transmission electron microscope.
September 20, 2016
Date of Patent:
May 15, 2018
Ricoh Company, Ltd.
Tsuyoshi Nozaki, Yoshimichi Ishikawa, Tomoharu Miki, Yuta Takeuchi
Abstract: A method and apparatus for discriminating bottle types, for stirring the toner, and for detecting the amount of toner remaining in the toner bottle. A toner bottle is adapted to fit the apparatus for discriminating toner bottle types, and a toner bottle is adapted for the apparatus for stirring toner. The genuineness of the toner bottle product is checked by sensing a rib assumed to be formed with a predetermined length on the outer surface of the toner bottle. Toner is stirred by continuously rotating the toner bottle in forward and reverse directions. The toner bottle can be easily rotated in the forward and reverse directions by sensing the rib of the toner bottle by using the sensor. Since the load of rotation of the toner bottle changes in accordance with the amount of remaining toner, the rotational speed of the toner bottle is sensed by using the sensor to check whether toner is close to empty.
December 18, 2017
Date of Patent:
October 22, 2019
TOSHIBA TEC KABUSHIKI KAISHA, TOSHIBA AMERICA BUSINESS SOLUTIONS, INC.