Abstract: A seal bearing includes: a bearing part configured to bear and hold a shaft such that the shaft is rotatable; and a seal part made of elastomer and combined with the bearing part. The seal part is joined to an end surface among two end surfaces of the bearing part. The two end surfaces are adjacent to a bearing surface of the bearing part in an axial direction.

Abstract: A powder container case includes a first member, a second member, a main joint, and an additional joint. The first member and the second member are joined to form an edge portion of a case opening. The main joint is disposed between the first member and the second member, and has an end portion at the edge portion of the case opening. The additional joint is disposed adjacent to the end portion of the main joint.

Abstract: A developing apparatus includes a developer container that stores developer, a conveyance screw including a shaft portion and a blade, a bearing portion configured to engage with an engagement portion of the shaft portion of the conveyance screw, and a magnetic seal member having a magnetic property and disposed along a peripheral surface of the shaft portion in a noncontact manner with respect to the shaft portion between the blade and the engagement portion in the rotational axis direction of the conveyance screw.

Abstract: A drum cartridge that enables a developing cartridge to be mountable thereon, includes a photosensitive drum rotatable about a shaft extending in a first direction, and an electrically conductive movable member. When the developing cartridge is mounted on the drum cartridge, the movable member applies pressure to a developing electrode included in the developing cartridge toward the photosensitive drum.

Abstract: A developing device includes a first conveyance screw including a first blade portion and a second blade portion, the first blade portion configured to convey the developer in a first direction, the second blade portion being disposed downstream of the first blade portion in the first direction and configured to convey the developer in a second direction, a discharge path through which the developer passes to be discharged through a discharge port, and a magnet. The first conveyance screw includes a third blade portion disposed in the discharge path and configured to convey the developer in the first direction. The discharge port is disposed downstream of an upstream end of the third blade portion in the first direction. The magnet is disposed downstream of an upstream end of the discharge port in the first direction so as to overlap with the discharge port in the first direction.

Abstract: An image forming apparatus includes a storage unit and a charging amount acquisition unit. The charging amount acquisition unit forms a measurement toner image on the image carrier while changing the frequency of the alternating current voltage of the development bias, acquires a tilt of a measurement straight line representing a relationship between the change amount of the frequency and a density change amount of the measurement toner image based on the change amount of the frequency and a result of detecting density of the measurement toner image in the density detecting unit, and acquires the charging amount of the toner based on the acquired tilt of the measurement straight line and the reference information in the storage unit.

Abstract: In one example, a seal for a developer roller in a liquid electrophotographic printer includes an arcuate body curved along a body arc. The body has an inboard face that defines an annular sealing surface along the body arc to contact a face on one end of the developer roller and a guide surface across the body arc at a first end of the annular sealing surface. The guide surface is oriented along a chord of the body arc and intersects the body arc at an obtuse interior angle, to guide any ink encountering the guide surface outward toward the circular outer surface of the developer roller.

Abstract: A developing apparatus includes a developer rotary member, a magnetic field generating portion, and a magnet portion. If an area of the magnet portion on an inner side from the end portion of the magnetic field generating portion with respect to the rotational axis direction of the developer rotary member is defined a first magnet area and an area of the magnet portion on an outer side from the end portion with respect to the rotational axis direction is defined a second magnet area, an average value of a component, in a normal direction of the developer rotary member, of a magnetic flux density of the magnet portion in the second magnet area is greater than an average value of a component, in a normal direction of the developer rotary member, of a magnetic flux density of the magnet portion in the first magnet area by 100 gauss or more.

Abstract: A developing device includes a housing, a developer carrier, a regulating blade forming a regulating portion for regulating the layer thickness of developer on the developer carrier, a magnetic member arranged inside the developer carrier and having a plurality of magnetic poles including S and N poles, and a blade magnet inducing a magnetic pole at the tip end of the regulating blade. The magnetic member is movable between a first position where a magnetic pole having the same polarity as that of the facing magnetic pole of the blade magnet facing the developer carrier is arranged at a regulating portion and a second position where a magnetic pole having a different polarity is arranged at the regulating portion. The developing device can perform a first developer eliminating mode where the magnetic member is moved to a second position and the developer carrier is rotated forward during non-image forming period.

Abstract: A method of modifying a toner hopper including a toner window and an end cap. The method including providing a slot on the end cap and applying a toner seal covering the toner window, the toner seal including a pull tab. The method further including applying an end seal to the toner hopper, the end seal providing a gap and placing the pull tab within the gap and the slot.

Abstract: A manufacturing method of a cartridge, the cartridge being attachable to an apparatus main body of an image forming apparatus, the cartridge including a first member and a second member, the first member including a receiving surface and a retaining portion, and the second member including a contact surface in contact with the receiving surface. In the manufacturing method, the first member and the second member are held so that the contact surface covers the retaining portion and so that the contact surface and the receiving surface are in contact with each other and joined by ultrasonic spot welding so that a recess recessed towards the retaining portion is formed in the second member and so that at least part of a fused portion of the first member and the second member enters the retaining portion.

Abstract: According to an embodiment, an image forming apparatus includes a housing, a developing roller, and a photosensitive drum. The developing roller includes an image area and a pair of non-image areas. The image area extends along an axial direction the developing roller. The non-image areas are provided on both sides in the axial direction with respect to the image area. The image forming apparatus further includes a regulating member. The regulating member covers a gap in positions which are aligned over the non-image area. The regulating member regulates air flow toward sides of the image area in the axial direction.

Abstract: At an end, in a longitudinal direction, of an opening in a container containing a magnetic developer, an overlap portion is provided in which a developer bearing member, a regulating member, a sealing member, and the container are arranged so as to sequentially contact one another in a direction orthogonal to a rotation axis direction. A magnetic field generating member provided inside the developer bearing member has a first area where a value of a magnetic flux density is a predetermined value in the rotation axis direction and a second area including a local minimum portion in which the value is a minimum value, within a range from an end of the second area connected to the first area to an outer end of the overlap portion in the rotation axis direction.

Abstract: A developer roll according to one example embodiment includes a core including at least one permanent magnet forming a magnetized portion of the core. A cylindrical sleeve positioned around the core is rotatable relative to the core about an axis of rotation in an operative rotational direction. A release pole of the permanent magnet is positioned to magnetically attract developer mix to an outer circumferential surface of the sleeve to transport developer mix on the surface of the sleeve in the operative rotational direction when the sleeve rotates relative to the core to a release point where a magnetic field of the permanent magnet is insufficient to retain developer mix against the surface of the sleeve. An axial length of the magnetized portion of the core decreases at both axial ends of the core as the magnetized portion of the core approaches the release point in the operative rotational direction.

Abstract: A developing cartridge, comprising: a housing; a developing roller; a drive mechanism configured to transmit a driving force to the developing roller; and a restriction part configured to restrict movement of the housing when the restriction part engages with an external member, wherein the housing comprises: a first side wall; and a second side wall spaced from the first side wall in a first direction, wherein the drive mechanism is disposed to the second side wall, wherein: the restriction part is disposed to the first side wall; and the restriction part comprises projecting parts spaced from each other in a second direction perpendicular to the first direction.

Abstract: The present invention relates to a developing unit including a developer container accommodating a developer; a developer bearing member bearing the developer supplied from the developer container; a magnetic-field generation member disposed in the developer bearing member, the magnetic-field generation member having a magnetic-field generation area generating a magnetic field for attracting the developer to the developer bearing member; and a sealing member disposed at the developer container, the sealing member preventing the developer from leaking from a gap between a longitudinal end of the developer bearing member and the developer container. An end of the magnetic-field generation area of the magnetic-field generation member is disposed inside an inner end of the sealing member in the longitudinal direction of the developer bearing member. The developer bearing member develops a latent image formed on the image bearing member with the developer while keeping in contact with the image bearing member.

Abstract: A magnet roller includes a plurality of magnet pieces disposed along a circumferential direction of the magnet roller. The magnetic pieces include one or more first magnet pieces having a first magnetic polarity at a surface opposing an inner surface of the magnet roller, and one or more second magnet pieces having a second magnetic polarity, which is opposite of the first magnetic polarity, at a surface opposing the inner surface of the magnet roller. In a longitudinally central portion of the magnet roller, a ratio of a total sum of volumes occupied by the one or more first magnet pieces per unit length is larger than a ratio of a total sum of volumes occupied by the one or more second magnet pieces per unit length, and the ratio of the total sum of the volumes occupied by the one or more first magnet pieces per unit length in a longitudinally end portion is smaller than that in the longitudinally central portion.

Abstract: A developer unit according to one example embodiment includes a housing having a reservoir for storing a developer mix that includes toner and magnetic carrier beads. A magnetic roll includes a stationary core and a sleeve positioned around the core that is rotatable relative to the core. The stationary core includes at least one permanent magnet having circumferentially spaced magnetic poles. An upper and a lower magnetically permeable metal shunt are positioned at each axial end of the magnetic roll. Each upper shunt and each lower shunt is positioned axially outboard of the core and in close proximity to the outer surface of the sleeve. A combination of the upper shunt and the lower shunt at each axial end of the magnetic roll surrounds greater than 180 degrees of the outer surface of the sleeve.

Abstract: A developing apparatus including a layer thickness adjustment member configured to regulate a layer thickness of a two-component developer carried on a surface of a developing sleeve of a developing roller is disposed so that one end portion in a width direction faces the surface of the developing sleeve at a predetermined interval. At two end portions in a longitudinal direction of the layer thickness adjustment member, a notch open to the one end side in the width direction is provided. Since an amount of conveyance of the developer locally increases at two end portions of the developing sleeve by providing such a notch in the layer thickness adjustment member, density of an ear of a magnetic brush to be formed increases, and it is possible to exhibit the sufficient seal performance and prevent the toner from being scattered.

Abstract: A developing device includes a developing roller, a regulating blade, seal members, and contact members. The regulating blade extends in a rotation axis direction of the developing sleeve, is disposed opposite to a circumferential surface of the developing sleeve, and regulates a quantity of the toner on the circumferential surface of the developing sleeve. The seal members are disposed opposite to the circumferential surface without being in contact with both ends of the developing region in the rotation axis direction. Each contact member is an edge on the developing region side in the rotation axis direction, provided at a position at an upstream side in a rotational direction of the circumferential surface of the developing sleeve relative to an arrangement position of the regulating blade, and configured to be in contact with the circumferential surface of the developing sleeve.

Abstract: A developing apparatus includes a developing container for accommodating a developer including magnetic particles; a developer feeding member, provided in the developing container and having a magnetic shaft, for feeding the developer; a bearing rotatably supporting the shaft; a bearing accommodating portion; and a magnet, provided around the shaft at a position inside the bearing in the bearing accommodating portion, for forming a magnetic seal of magnetic particles by a magnetic field formed between itself and the shaft; wherein the bearing accommodating portion includes a first space between the magnet and the bearing and a second space which is provided outside of the bearing with respect to a diametrical direction and which is in fluid communication with the first space to receive the developer from the first space.

Abstract: A developing device includes a developer carrier that has a cylindrical shape and that rotates while holding developer to supply the developer to an image carrier on which an electrostatic latent image is formed; a container that contains the developer carrier; a discharge-path forming member that forms a discharge path along which air is discharged out of the container from inside the container; and a magnetic member that generates a magnetic field that acts on the developer in the discharge path and causes the developer to stay in the discharge path.

Abstract: A method presently disclosed provides a housing configured to accommodate a roller, configured to accommodate a toner, and configured to accommodate at least one magnetic seal member, wherein the at least one magnetic member is configured to minimize leakage of the toner between the roller and the housing and couples at least one non-magnetic seal member with the housing, wherein the at least one non-magnetic seal member is configured to minimize leakage of the toner between the housing and the roller.

Abstract: A developing apparatus includes a developing container for accommodating developer including magnetic particles, a developer carrying member, rotatably provided in the developing container, for carrying the developer to a region where the developer carrying member is opposed to image bearing member, and a magnet stationarily provided in the developer carrying member, having a pair of magnetic poles of the same polarity adjacent to each other in a circumferential direction of the developer carrying member. In addition, a magnet member extends at each of longitudinal end portions of the developer carrying member within a circumferential range opposed to and between a half-peak width zone of one of the magnetic poles and a half-peak width zone of the other one of the magnetic poles. A side of the magnet member opposed to the developer carrying member is magnetized only to a polarity which is the same as the polarity of the pair of magnetic poles.

Abstract: Provided is a developing unit including: a developer container configured to contain a magnetic developer; a developer carrier provided with an elastic portion, configured to bear the magnetic developer in the elastic portion and to cause the elastic portion to be in contact with an image bearing member to develop a latent image formed on the image bearing member; and a magnetic sealing member disposed, on a plane which perpendicularly crosses an axial line of the developer carrier, at a predetermined distance from a longitudinal direction end portion of the developer carrier and configured to regulate leakage of the developer from between the developer container and the developer carrier, wherein, in a longitudinal direction of the developer carrier, an end portion of the elastic portion is disposed between an inner end portion and an outer end portion of the magnetic sealing member.

Abstract: A magnetic flux density formed on a sleeve surface by a magnetic seal member on a downstream side in a conveyance direction of a developer agitation and conveyance member is greater than a magnetic flux density formed on the sleeve surface by a magnetic seal member on an upstream side in the developer conveyance direction.

Abstract: A developing device includes a developer carrying member for carrying a magnetic developer to form a developer image on an image bearing member; a developing device frame including a first accommodating chamber for accommodating the magnetic developer and including a second accommodating chamber, in which the developer carrying member is provided, for accommodating the magnetic developer supplied from the first accommodating chamber through a first opening; a removable sealing member for sealing the first opening; and a magnetic seal, provided between a longitudinal end portion of the developer carrying member and the developing device frame. The sealing member is removable through a second opening which is defined at least partly by the magnetic seal.

Abstract: Provided is an electrophotographic magnetic sealing member for sealing magnetic toner contains a magnetic material and a binder resin. The magnetic material at least includes Nd and Fe, and further includes at least one element selected from the group consisting of Sr and Ba, at least one element selected from the group consisting of Pr and La, at least one element selected from the group consisting of B, Si, In, and P, and an Al element. The magnetic material has a residual magnetic flux density of 270 mT to 500 mT, an intrinsic coercive force of 400 kA/m to 850 kA/m, and a maximum energy product of 10.0 kJ/m3 to 40.0 kJ/m3. The electrophotographic magnetic sealing member contains 3.0 parts by mass to 15.0 parts by mass of the binder resin based on 100.0 parts by mass of the magnetic material.

Abstract: A scanner includes a scanning module and a base. The scanning module includes a loading panel and a driving module. The base includes a bottom panel, a sliding portion, and a first resisting tab extending from the bottom panel. A sliding slot is defined in the sliding portion to receive the scanning module. The first resisting tab includes a first tab body extending from the bottom panel and a first resilient absorbing portion connected to the first tab body. The first resilient absorbing portion resists the loading panel to prevent movement of the loading panel when the loading panel moves to a first side of the sliding slot.

Abstract: An embodiment of a developing device may include a housing, magnetic developer, and a developer bearing member. In some embodiments, the developer bearing member may include a magnet member. The magnet member may allow the developer to remain in the housing. A developer regulating member may be positioned proximate the developer bearing member and have one or more cut portions. In some embodiments, the cut portions may be positioned at each end of the developer regulating member in a surface facing the developer bearing member. The developer regulating member may regulate an amount of the developer held on the developer bearing member. A magnetic sealing member may extend along an outer peripheral surface of the developer bearing member at each end and may be positioned proximate the cut portion. In some embodiments, a portion of the magnetic sealing member may be positioned within the cut portion.

Abstract: A developing device includes a developing roller; a housing that retains the developing roller such that the developing roller has exposed and unexposed portions, end portions of the housing having first faces curved along the unexposed portion and second faces facing inward; a layer-thickness regulating member having an edge near the developing roller; a first magnet including a first magnetic pole that attracts the developer and a second magnetic pole located downstream of the first magnetic pole and upstream of the exposed portion in a rotational direction of the developing roller, the second magnetic pole having a magnetic force of about 60 mT or less; second magnets retained on the first faces; and magnetic plates retained on the second faces and arranged such that developer chains formed thereon at the downstream ends in the rotational direction extend to positions upstream of the edge of the layer-thickness regulating member.

Abstract: A developing device develops a latent image on an image carrier by using a developer. The device includes a developer carrier that faces the image carrier and is configured to rotate while magnetically holding developer on its outer circumferential surface. The device also includes a magnetic member elongated along a rotational direction of the developer carrier to form a gap that surrounds the outer circumferential surface. The magnetic member overlaps an end of a developing region in a direction of a rotational axis of the developer carrier, when viewed from a direction perpendicular to the rotational axis. When a side of the magnetic member close to a center of the developer carrier is divided into first and second sides and located downstream and upstream in the rotational direction, respectively, the first side is set back further from the center than a position where the first and second sides meet.

Abstract: A magnetic flux density formed on a sleeve surface by a magnetic seal member on a downstream side in a conveyance direction of a developer agitation and conveyance member is greater than a magnetic flux density formed on the sleeve surface by a magnetic seal member on an upstream side in the developer conveyance direction.

Abstract: A developing apparatus includes a developer carrying member for carrying a developer containing magnetic particles; a magnetic member, including first and second magnetic poles which have the same magnetic polarity; a magnetic seal provided opposed to the developer carrying member at a side remote from an image bearing member. The magnetic seal has a third magnetic pole which is most closely opposed to a peak position of the first magnetic pole and which has a magnetic polarity opposite to that of the first magnetic pole, and a fourth magnetic pole which is most closely opposed to a peak position of the second magnetic pole and which has a magnetic polarity opposite to that of the second magnetic pole. Between the third and fourth magnetic poles, the magnetic seal has only one magnetic pole having a polarity opposite to that of the third and fourth magnetic poles.

Abstract: A developing apparatus includes a container for accommodating developer including magnetic particles, a rotatable carrier for carrying the developer to a region where the carrier is opposed to an image bearing member, a magnet in the carrier and having a pair of adjacent, same-polarity magnetic poles provided in a circumferential direction of the carrier, and a seal opposing the carrier along a circumferential direction at an axial end of the carrier, for contacting the developer confined by a magnetic field formed between the carrier and the seal to the carrier to effect sealing. The seal includes a magnet located only in a region opposing the pair of magnetic poles. The seal magnet has magnetic poles of the same polarity as the magnetic poles of the carrier magnet that are opposed to the magnetic poles of the carrier magnet of the same polarity.

Abstract: In a device or method for sealing a shaft against penetration of a two-component toner mixture comprising magnetic carrier particles and toner particles, an annular, stationary sealing device is arranged radially at a distance of an annular gap around the shaft. The annular gap is charged with a magnetic field. The annular gap is filled with a mixture of a semi-fluid, highly viscous barrier medium and magnetic carrier particles, and wherein the mixture in the annular gap contains 40 to 85 percent by weight or 15 to 60 percent by volume of the magnetic carrier particles.

Abstract: This is an auger shaft seal used in an electrophotographic marking system. The seal is made up of alternating raised and depressed pie-shaped sections, each having edges that force developer away from auger bearings. The seal of this invention can be used on bi-directional augers and will protect the bearing when the auger moves in a clockwise or counter-clockwise direction. The seal is used with a magnetic seal to add additional protection for the bearings.

Abstract: A developing device for developing with a developer a latent image formed on an image bearing member includes a container for containing the developer; a stirring member, rotatably supported by the container, for stirring the developer in the container; a magnetic member for forming a magnetic field in a gap between the container and a rotation shaft located at an end portion of the stirring member so as to magnetically confine magnetic particles in the gap; a seal member, provided outside the magnetic member with respect to a rotation shaft direction of the stirring member, contacting a peripheral surface of the rotation shaft of the stirring member; and a non-magnetic preventing portion, provided between the magnetic member and the seal member, for preventing the magnetic particles confined by the magnetic member from spreading toward the seal member.

Abstract: Aspects of the disclosure provide a printing method that can utilize a lightly pigmented toner along with a darkly pigmented toner to improve the image quality. The method can include receiving a dataset corresponding to a printing of a printing system using a darkly pigmented toner. The printing system may have an undesirable optical density printing range for the darkly pigmented toner. Further, the method can include converting the dataset to a first dataset corresponding to a first printing of the printing system using the darkly pigmented toner, and a second dataset corresponding to a second printing of the printing system using a lightly pigmented toner. The first dataset can avoid the undesirable optical density printing range for the darkly pigmented toner, and a combination of the first printing and the second printing providing a substantially same printed optical density corresponding to the received dataset.

Abstract: Certain embodiments provide a developing device including: a case; a cylindrical sleeve having a development region on the outer circumferential surface and a pair of non-development regions respectively in regions at both ends in an axis direction on the outer circumferential surface; a magnet on the inside of the sleeve; plural grooves each formed between both the ends along the axis direction; a pair of magnetic sheet metals provided spaced apart from the sleeve; and a pair of magnetic seal members provided spaced apart from the sleeve. When average groove depth of the plural grooves in the development region is represented as P, thicknesses t of the magnetic sheet metals are substantially t?10×P (mm) and groove depths d of the plural grooves in the non-development regions of the sleeve are P/10?d?4P/5(mm).

Abstract: A developing device includes a developer carrying member for carrying a magnetic developer to form a developer image on an image bearing member; a developing device frame including a first accommodating chamber for accommodating the magnetic developer and including a second accommodating chamber, in which the developer carrying member is provided, for accommodating the magnetic developer supplied from the first accommodating chamber through a first opening; a removable sealing member for sealing the first opening; and a magnetic seal, provided between a longitudinal end portion of the developer carrying member and the developing device frame. The sealing member is removable through a second opening which is defined at least partly by the magnetic seal.

Abstract: A developing device that develops a latent image on an image carrier with use of developer, comprising: a developer carrier provided to face the image carrier, and configured to rotate while magnetically holding the developer on an outer circumferential surface thereof; and a magnetic member elongated along a rotational direction of the developer carrier to surround the outer circumferential surface with a gap therebetween, wherein when viewed from a direction perpendicular to a rotational axis of the developer carrier, the magnetic member overlaps an end of a developing region in a direction of the rotational axis, and when a side of the magnetic member close to a center of the developer carrier is divided into first and second sides respectively located downstream and upstream in the rotational direction, the first side is set back further from the center than a position where the first and second sides meet each other.

Abstract: A development unit includes a developer accommodating part that accommodates a developer therein, a developer stirring-transporting member that transports the developer in the developer accommodating part while stirring the developer, a bearing part that receives a rotating shaft of the developer stirring-transporting member, a magnetic member that is located between the bearing part and the developer accommodating part and fixed around the rotating shaft, and a stirring member that is spaced apart from the magnetic member so as to be opposed to the magnetic member and that is arranged at the rotating shaft of the developer stirring-transporting member.

Abstract: A developing unit which forms an image on a photosensitive medium, includes a housing which accommodates a developer, a magnetic cylinder having a catch pole which picks up the developer in the housing by a magnetic force, and a main pole which couples a carrier among the picked-up developer, a sleeve rotatably installed on a circumference of the magnetic cylinder to form a magnetic brush having a predetermined width on the circumference by the developer picked up by the catch pole, and a sealing member provided at opposite end parts in an axial direction of the sleeve to prevent a leak of the developer, wherein a width Ws of the sleeve, a magnetized width WM of the main pole, a magnetized width Wc of the catch pole, and a width WB of the magnetic brush satisfy WS>WM>WB>WC.

Abstract: This is an auger shaft seal used in an electrophotographic marking system. The seal is made up of alternating raised and depressed pie-shaped sections, each having edges that force developer away from auger bearings. The seal of this invention can be used on bi-directional augers and will protect the bearing when the auger moves in a clockwise or counter-clockwise direction. The seal is used with a magnetic seal to add additional protection for the bearings.

Abstract: In a device or method for sealing a shaft against penetration of a two-component toner mixture comprising magnetic carrier particles and toner particles, an annular, stationary sealing device is arranged radially at a distance of an annular gap around the shaft. The annular gap is charged with a magnetic field. The annular gap is filled with a mixture of a semi-fluid, highly viscous barrier medium and magnetic carrier particles, and wherein the mixture in the annular gap contains 40 to 85 percent by weight or 15 to 60 percent by volume of the magnetic carrier particles.

Abstract: A developing apparatus includes a developer carrying member for carrying a developer containing magnetic particles and for developing a latent image formed on an image bearing member; a magnetic member, provided in the developer carrying member, for magnetic confinement of the developer on a surface of the developer carrying member, wherein the magnetic member has a set of repelling poles including a first magnetic pole and a second magnetic pole which have the same magnetic polarity; and a magnetic seal provided opposed to the developer carrying member at a side remote from the image bearing member; wherein the magnetic seal includes a third magnetic pole and a fourth magnetic pole having a magnetic polarity opposite that of the first magnetic pole at a position opposed to the first magnetic pole and the second magnetic pole, respectively, and includes only one fifth magnetic pole having the same polarity as that of the first magnetic pole.

Abstract: A developing apparatus for an image forming apparatus includes a magnetic sealing member having an arcuate surface and having a magnetic property, and which is opposed to an outer surface of a developing roller with a gap therebetween and a projected surface having a magnetic property projected from an upstream end of the arcuate surface toward upstream with respect to a peripheral moving direction of the developing roller, and which is more remote from an outer surface of the developing roller than the arcuate surface; and a sheet for preventing the magnetic developer from leaking between the developing device frame and the developing roller. The sheet is mounted to an upstream end of a developing device frame with respect to the moving direction and contacted to the developing roller so as to cover at least a part of the projected surface.

Abstract: A developing device for developing with a developer a latent image formed on an image bearing member includes a container for containing the developer; a stirring member, rotatably supported by the container, for stirring the developer in the container; a magnetic member for forming a magnetic field in a gap between the container and a rotation shaft located at an end portion of the stirring member so as to magnetically confine magnetic particles in the gap; a seal member, provided outside the magnetic member with respect to a rotation shaft direction of the stirring member, contacting a peripheral surface of the rotation shaft of the stirring member; and a non-magnetic preventing portion, provided between the magnetic member and the seal member, for preventing the magnetic particles confined by the magnetic member from spreading toward the seal member.

Abstract: An embodiment of a developing device may include a housing, magnetic developer, and a developer bearing member. In some embodiments, the developer bearing member may include a magnet member. The magnet member may allow the developer to remain in the housing. A developer regulating member may be positioned proximate the developer bearing member and have one or more cut portions. In some embodiments, the cut portions may be positioned at each end of the developer regulating member in a surface facing the developer bearing member. The developer regulating member may regulate an amount of the developer held on the developer bearing member. A magnetic sealing member may extend along an outer peripheral surface of the developer bearing member at each end and may be positioned proximate the cut portion. In some embodiments, a portion of the magnetic sealing member may be positioned within the cut portion.