Abstract: The present invention relates to a developing apparatus in which a developer bearing body is provided at its longitudinal part with a roughness formed surface, and a leakage preventing member contacts with the developer bearing body outside of the roughness formed surface in a longitudinal direction.

Abstract: In a developing assembly having a developer container, a developer-carrying member, a developer layer thickness control member, a magnetic-field formation means and an agitation means, the developer is a two-component developer which contains at least a binder resin, a colorant, an organometallic compound and a wax and has wax-dispersed non-magnetic toner particles with an average particle diameter of from 2 &mgr;m to 10 &mgr;m and a magnetic carrier, and the developer-carrying member has been subjected to surface blasting with spherical particles to have a surface having a ten-point average roughness Rz of from D/6 to D/2 where D is the average particle diameter of the magnetic carrier.

Abstract: A developing device, used in an image forming device where a developer supported on a developer supporter is thinned by a thinning member, and after being thinned, the developer is adhered to develop a latent image on an image supporter. An adjacent member (a developer scattering blocking member) is disposed at a position adjacent to the thinning member's downstream side in the developer supporter's moving direction, and the adjacent member's thinning member side of the opposite surface that is opposite to the developer supporter and the tip of the thinning member are disposed with an equal distance from the developer supporter.

Abstract: A magnetic toner contains, as a magnetic powder, magnetic iron oxide having an octahedral particle shape and an average particle diameter of 0.21 &mgr;m or larger and containing 18% or more by weight of FeO. The magnetic toner is so prepared as to have a bulk density A (g/cm3) and a magnetic powder content B (% by weight) that fulfill the formulae 0.8≦A/B×100≦1.6 and 35≦B≦50. This alleviates the reddishness of images produced with the magnetic toner, and alleviates the disturbance of a thin toner layer on a developing sleeve and thus the fogging resulting therefrom.

Abstract: A developing apparatus and a method for assembling the apparatus is capable of uniformalizing a thickness of a developer carried on a developer carrying body, thereby preventing a nonuniform optical density of an image from being produced. The developing apparatus includes a developing frame, a developer carrying body, and a regulating member, wherein the regulating member includes an elastic blade to be brought into contact with the developer and a supporting member for supporting the elastic blade. The supporting member is supported by the developing frame. The elastic blade is coupled with the supporting member by welding.

Abstract: A developing device of the present invention includes a developing roller provided with a plurality of magnetic poles. The magnetic poles include a main pole and two auxiliary poles positioned at both sides of the main pole for helping the main pole form a magnetic force. The auxiliary poles reduce the half width of the main pole. An AC-biased DC bias for development is applied to the developing roller and disturbs carrier grains close to the developing roller. Images free from various defects including granularity and local omission are achievable with the developing device.

Abstract: An image forming apparatus of non-contact developing method using two-component developer material which is capable of obtaining a clear image free from fogging, ghost and toner contamination. The image forming apparatus has at least one developing unit which develops an electrostatic latent image on a photosensitive body with a toner thin layer formed on the surface of a developing roll wherein a toner thin layer forming region on the developing roll is smaller than a magnetic brush forming region on the magnetic brush.

Abstract: A developing apparatus for use in an image forming apparatus includes a developer bearing member having a magnetic field generating device internally and configured to bear and convey two-component developer including toner and magnetic carrier, a first regulating member configured to regulate an amount of the developer born and conveyed by the developer bearing member, a developer container section for storing the developer scraped off by the first regulating member, a second regulating member arranged upstream of the first regulating member in a conveying direction of the developer on the developer bearing member, and a toner container section for supplying toner to the developer bearing member. The developing apparatus changes a toner take-in condition of the developer on the developer bearing member by changing a contact condition between the developer and the toner according to a change of a toner density of the developer on the developer bearing member.

Abstract: A remanufacturing method for a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus includes the steps of separating first and second units of the cartridge, dismounting from the second unit a developing blade mounted to the second unit, filling developer into a developer accommodating portion of the second unit through a developer supply opening for supplying a developer roller of the second unit from the developer accommodating portion, mounting the dismounted developing blade to the second unit with a facing orientation opposite from a facing orientation before the developing blade dismounting step, and coupling the first and second units.

Abstract: A developing device used for the main body of an electrophotographic image forming apparatus to develop an electrostatic latent image formed on an electrophotographic photosensitive member includes a developer bearing member for supplying developer to the electrophotographic photosensitive member to develop the electrostatic latent image formed on the electrophotographic photosensitive member, a developer regulating member for regulating the amount of developer adhering to the surface of the developer bearing member, an electrode member arranged in the traveling route of the developer removed from the surface of the developer bearing member by the developer regulating member to guide the traveling toner in the direction away from the developer bearing member, and a developer in-flow restricting member arranged for preventing the developer from flowing into the surface on the side opposite to the surface of the developer regulating member facing the developer bearing member.

Abstract: The invention is directed to a method and to an apparatus for setting a metering gap in a developer station (1). The developer station (1) includes a magnetic drum (5) that comprises a preceding metering device for the acceptance of a developer mix (6) and for forming a uniformly distributed developer mix (6), whereby the metering gap (2) is formed between the magnetic drum (5) and the metering device and the metering device is formed by a metering profile (3). The metering profile (3) is adjustably held such at both axial ends by a respective eccentric (4) that a setting of the width of the metering gap (2) ensues by turning the respective eccentric (4). The eccentrics (4) are adjustable independently of one another.

Abstract: A developing device for feeding a developer stored therein to an image carrier of the present invention includes a sleeve facing the image carrier for causing the developer deposited thereon to contact a latent image formed on the image carrier. A regulating member faces the sleeve for regulating the thickness of the developer that forms a layer on the sleeve. A guide member has a guide surface for guiding the developer regulated by the regulating member toward the surface of the image carrier. The guide surface has a conductive surface facing the sleeve. The developing device protects the image carrier from defective images ascribable to impurities, which include deteriorated toner and paper dust, without resorting to a filter mechanism or a bias for collection.

Abstract: An image formation apparatus develops an electrostatic latent image with a two-component developer consisting of magnetic carriers and toners by using a development apparatus and a latent image supporter including a filler in an outermost layer thereof, the development apparatus having a developer supporter, which has an internally fixed magnetic body and rotates while supporting a developer on a surface thereof, and a developer quantity controller controlling a quantity of the developer which is supported by the developer supporter facing the magnetic body and controlling a height of magnetic brushes and consisting of materials having rigidity or rigidity and magnetic properties, wherein a ratio (Gp/Gd) of a development gap to a doctor gap between the developer supporter and the controller is from 0.7 to 1.0, and a weight-averaged particle diameter of a developer carrier is from 20 to 60 &mgr;m.

Abstract: Added to magnetic toner particles are 0.5 to 5% by weight based on the total weight of the toner particles of a magnetic powder and 0.01 to 0.5% by weight based on the total weight of the toner particles of stearate particles having an average particle diameter of 1 &mgr;m to 5 &mgr;m.

Abstract: A developing device capable of obviating carrier deposition on an image carrier and uniformly distributing toner on a developer carrier is disclosed. A developer deposited on the developer carrier and moved away from a metering member rises in the form of a magnet brush, falls down, and again rises in accordance with the movement of the developer carrier. The toner of the developer is efficiently agitated in the axial direction of the developer carrier in a narrow zone between the first metering member and a developing zone.

Abstract: A developing device for developing an electrostatic latent image formed on electrophotographic photosensitive member includes a developer accommodating portion for accommodating a magnetic developer and a developing roller for developing with the developer the electrostatic latent image formed on the electrophotographic photosensitive member. The developing roller contains therein a magnetic flux generating member, which is effective to generate a magnetic force by which the developer is carried on a peripheral surface of the developing roller. The device also includes a developer regulating member for regulating an amount of the developer carried on the peripheral surface of the developing roller and a blocking member for blocking the developer from entering such a side of the developer regulating member as is opposite from the developer roller.

Abstract: A developing apparatus includes a developer carrying member carrying thereon a developer having a magnetic substance. The developer carried on the developer carrying member contacts an image holding member in a developing portion. A regulating member abuts against the developer carried on the developer carrying member and regulates the layer thickness of the developer carried on the developer carrying member. A DC electric field forming unit forms a DC electric field between the developer carrying member and the regulating member. The intensity of the electric field formed between the developer carrying member and the regulating member being 10×106 to 28.3×106 (V/m).

Abstract: A developing apparatus in which variations in density caused by different development histories are reduced, and a high-quality halftone image is reproduced. When m1 represents a weight per unit area of a thin layer of developing agent that is pressed again by a layer thickness-regulating member while having been carried on the surface of a developing agent carrier that corresponds to an area of a photosensitive member where no visible image has been formed, and m2 represents the weight per unit area of a thin layer of developing agent that is pressed by the layer thickness-regulating member after being newly supplied to the surface of the developing agent carrier that corresponds to an area of the photosensitive member where a solidly shaded visible image has been formed, the following equation is satisfied: m2=cm1 (0.75≦c≦0.95).

Abstract: In a developing device, a developer carrier carries developer and a control member controls the thickness of the developer on the developer carrier. The control member has an abutting member that abuts against a reference plane of a main body of the developing device and an elastic member that overlaps the abutting member. The elastic member is urged toward the developer carrier and has a center portion of the overlapped sections of the elastic member and the abutting member that is wider than the end portions of the overlapped sections. An overlap member overlaps the elastic member.

Abstract: A composite doctor blade comprises a steel support band configured with a width and thickness suitable for mounting in a blade holder, with tensile and yield strengths suitable for a selected doctoring application. A wear resistant strip of high speed steel is integrally joined to an edge of the support band. The wear resistant strip has tensile and yield strengths higher than those of the support band, and has a hardness of between about 55 to 65 Rc.

Abstract: An image forming apparatus of the present invention includes a developing device including a rotatable, nonmagnetic developer carrier and a magnetic field forming device. In a developing region where the developer carrier faces an image carrier, the magnetic field forming device causes a developer made up of toner and magnetic grains to rise on the developer carrier in the form of a magnet brush. In the developing region, the magnet brush on the developer carrier is caused to move at a higher speed than the surface of the image carrier in the same direction as and in contact with the surface of the image carrier, thereby developing the latent image. The toner of the developer is magnetic toner. Flux density set up in the developing region outside of the surface of the developer carrier in a normal direction has an attenuation ratio of 50% or above.

Abstract: A developing roller that supplies developing agent onto an electrostatic latent image on an image carrier, and a layer regulating blade that pressure contacts the developing roller and regulates a uniform layer pressure of the developing agent that is supplied to the developing roller are arranged, and an elastic resin coat layer whose thickness t is 10×a≦t≦300 [&mgr;m] is coated on the surface of the layer regulating blade, when the surface of the above developing roller is formed of a metallic material whose surface roughness Rz is a [&mgr;m], and the layer regulating blade is made of a metallic material.

Abstract: A development apparatus includes a first developer carrying member for carrying developer and is adapted to develop a latent image formed on an image bearing member with the developer at a first developing area. A second developer carrying member carries the developer and is adapted to develop the latent image formed on the image bearing member with the developer at a second developing area. A regulating member is borne on the second developer carrying member and is adapted to regulate a thickness of a layer of the developer. The second developer carrying member regulates a thickness of a layer of the developer carried on the first developer carrying member.

Abstract: A clearance regulating amount L by a clearance regulating member 4, which is provided above a developing roller 3 on a side closer to a photosensitive drum 1, is determined at a size not greater than a height T of a developer at a magnetic pole just downstream of the clearance regulated position. Thus, the scattering of the developer from a developing unit 2 is significantly reduced.

Abstract: A developing device includes a developer bearing member for bearing and conveying a developer having a toner and a carrier, a first magnetic pole arranged in the developer bearing member, a second magnetic pole arranged in the developer bearing member, a polarity of the second magnetic pole being opposite to a polarity of the first magnetic pole. The second magnetic pole is adjacent to the first magnetic pole and is arranged on a downstream side of the first magnetic pole in a moving direction of the developer bearing member. A regulating member regulates a layer thickness of the developer borne by the developer bearer. The regulating member is arranged in the vicinity of the second magnetic pole and a concentration detector for detecting a concentration of the toner in the developer.

Abstract: A developing device includes rotatable first and second developer carrying members carrying developer thereon to develop an electrostatic image formed on an image bearing member with the developer, the first and second developer carrying members being provided with a plurality of non-rotary magnetic pols therein, respectively, the second developer carrying member being provided upstream of the first developer carrying member in the direction of movement of the image bearing member to regulate the amount of the developer carried on the first developer carrying member, the direction of rotation of the second developer carrying member being the same direction as the direction of rotation of the first developer carrying member, and a developer regulating member for regulating the amount of the developer carried on the second developer carrying member.

Abstract: The doctor blade consists of at least a substrate provided with an element having a face adapted for working with a magnetic roller, said element being made at least partly of an elastic material, wherein the face adapted for working with a magnetic roller has an abrasion resistance of less than 0.5g (measured according to the method ASTM D4060).

Abstract: The invention is directed to a method and to an apparatus for setting a metering gap in a developer station (1). The developer station (1) includes a magnetic drum (5) that comprises a preceding metering device for the acceptance of a developer mix (6) and for forming a uniformly distributed developer mix (6), whereby the metering gap (2) is formed between the magnetic drum (5) and the metering device and the metering device is formed by a metering profile (3). The metering profile (3) is adjustably held such at both axial ends by a respective eccentric (4) that a setting of the width of the metering gap (2) ensues by turning the respective eccentric (4). The eccentrics (4) are adjustable independently of one another.

Abstract: The present invention relates to a developing apparatus, including: a developing agent carrier for carrying a developing agent to develop an electrostatic latent image formed on an image carrier with the developing agent; a regulating member for regulating a thickness of a layer of the developing agent carried by the developing agent carrier; and a securing member, provided with an engaging hole for engaging with an axis, for securing the regulating member to a main body of the developing apparatus. The securing member is provided with a cutting portion formed around the engaging hole so as to be able to absorb, in a longitudinal direction of the regulating member, a difference between elongation and contraction of the regulating member and elongation and contraction of the main body of the developing apparatus.

Abstract: A development apparatus includes a development roller, a supplying roller, and a toner layer regulating member. The development roller contacts an image carrying member and develops an electrostatic latent image into a toner image on the image carrying member. The development roller may be made of aluminum and is rotatably mounted in the apparatus. The supplying roller supplies toner to the development roller. The toner layer regulating member regulates the toner to form a thin film on the development roller. The toner layer regulating member has a roller shape, a surface roughness Rz in a range of from 0.5 &mgr;m to 2 &mgr;m, and a dynamic friction coefficient in a range of from 0.1 to 0.8.

Abstract: A developing device used for the main body of an electrophotographic image forming apparatus to develop an electrostatic latent image formed on an electrophotographic photosensitive member includes a developer bearing member for supplying developer to the electrophotographic photosensitive member to develop the electrostatic latent image formed on the electrophotographic photosensitive member, a developer regulating member for regulating the amount of developer adhering to the surface of the developer bearing member, an electrode member arranged in the traveling route of the developer removed from the surface of the developer bearing member by the developer regulating member to guide the traveling toner in the direction away from the developer bearing member, and a developer in-flow restricting member arranged for preventing the developer from flowing into the surface on the side opposite to the surface of the developer regulating member facing the developer bearing member.

Abstract: A cleaning element is arranged on the backside of the toner layer metering blade, i.e., the side opposite to the surface in contact with the developer support, in order to prevent the cleaning element from damaging the blade surface and the abutment surface of the metering blade against the developer support. This cleaning element is frictionally moved across the backside of the toner layer metering blade to remove stuck toner from the toner layer metering blade or prevent occurrence of buildups.

Abstract: In a developing device, a developer carrier carries developer and a control member controls the thickness of the developer on the developer carrier. The control member has an abutting member that abuts against a reference plane of a main body of the developing device and an elastic member that overlaps the abutting member. The elastic member is urged toward the developer carrier and has a center portion of the overlapped sections of the elastic member and the abutting member that is wider than the end portions of the overlapped sections. An overlap member overlaps the elastic member.

Abstract: It is an exemplified object of the present invention to provide a development device, development roller and blade used in the development device, and development roller and image-forming device having the development roller and blade, which can form a high-quality image by a cost-efficient means. To achieve this object, the inventive development roller comprises a shaft, a base material that coats a periphery of the shaft, and is made of a resistance body, and a layered coating provided on a periphery of the base material, where the layered coating includes two or more layers, a coating layer provided inside an outermost coating layer has a higher charging capability to a developing agent than at least the outermost coating layer.

Abstract: An electrophotograph development apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier body with magnetic developer includes a developer carrier body having a magnetic roller, and a thin layer forming member for forming the magnetic developer on the developer carrier body into a thin layer. A magnetic pole of the magnetic roller is disposed at a position of a &thgr; degree in an upper stream side relative to a rotational direction of the developer carrier body from a contact point of the thin film forming member and the developer carrier body, and &thgr; is in a range of 0 degree≦&thgr;≦10 degree. A relation between a surface roughness Rz′ of the developer carrier body and a surface roughness Rz of the thin layer forming member is represented by −10 &mgr;m≦(Rz-Rz′)≦5 &mgr;m.

Abstract: A developing device and a blade of the developing device, includes a contact section which is in plane contact with a development roller, and an inclined section which extends from an end of the contact section so as to form a flare at an inflow section of a one-component developer between the blade and development roller. When a flare angle between the blade having the flare and a line tangent to the development roller is denoted by a tilt angle &thgr;, 30°≦&thgr;≦90°. Thus, if the flare angle at the inflow section of the one-component developer between the blade and development roller is optimized, even when the one-component developer deteriorates with time, for example, the flowability is changed with time, it is possible to provide a developing device and a blade of the developing device capable of forming a one-component developer layer with an extremely stable deposit of one-component developer.

Abstract: An object of the present invention is to provide a developing apparatus which can obtain a stable toner charging amount even if a developer charging member is contaminated by toner and reduce reversal fog to reduce toner consumption, and which has a developer carrying body for carrying a developer to a developing position, and a developer charging member contacted with the developer to charge the developer, wherein the developer includes toner and conductive particle.

Abstract: A developing device comprises a developer bearing member for bearing and conveying a developer having a toner and a carrier, a first magnetic pole arranged in the developer bearing member, a second magnetic pole arranged in the developer bearing member, a polarity of the second magnetic pole being opposite to a polarity of the first magnetic pole, and the second magnetic pole being adjacent to the first magnetic pole and arranged on a downstream side of the first magnetic pole in a moving direction of the developer bearing member, a regulating member for regulating a layer thickness of the developer borne by the developer bearer, the regulating member being arranged in the vicinity of the second magnetic pole and a concentration detector for detecting a concentration of the toner in the developer.

Abstract: A developing device for an image forming apparatus of the present invention is capable of implementing double regulation on the amount of a developer with a first regulating member and second regulating members. The second regulating members, having inclined portions, are positioned upstream of opposite ends of the first regulating member in the direction of developer conveyance. It is therefore possible to obviate the adhesion of the developer at the opposite ends of the first regulating member. Further, a magnetic force is weakened at the opposite ends of a developer carrier adjoining the first regulating member for the same purpose.

Abstract: An object of the present invention is to provide a developing apparatus and an assembling method for this apparatus which are capable of uniformalizing a thickness of a developer carried on a developer carrying body, thereby preventing an ununiform optical density of image from being produced. Further object of the present invention is to provide a developing apparatus that has a developing frame, a developer carrying body, and a regulating member, wherein the regulating member has an elastic blade to be brought into contact with the developer and a supporting member for supporting the elastic blade, and the supporting member is supported by the developing frame, and wherein the elastic blade is coupled with the supporting member by welding.

Abstract: An object of the present invention is to provide a developing apparatus in which the temperature rise of a developing blade is restrained. The present invention provides a developing apparatus that has a developer carrying member for carrying a developer thereon, a regulating member for regulating an amount of the developer on the developer carrying member, and a heat pipe provided along a lengthwise direction of the regulating member.

Abstract: The doctor blade consists of at least a substrate provided with an element having a face adapted for working with a magnetic roller, said element being made at least partly of an elastic material, wherein the face adapted for working with a magnetic roller has an electrical surface resistivity of less than 9.9 1014 &OHgr; per square and wherein the element has thickness of at least 100 &mgr;m.

Abstract: A developing apparatus designed to allow toner uniformly charged with a predetermined electric charge to be formed into a toner layer formed on a circumferential surface of a developing roller, and further to allow a good image to remain formed. In order to allow a proper amount of toner having a proper specific electric charge to deposit on the circumferential surface of the developing roller, the blade is bent at a bending angle of at least 45° while being positioned against the circumferential surface of the developing roller when displacement amount &Dgr;L is at most plus 0.4 mm.

Abstract: A positioning member has a position, which can be adjusted with respect to a developing container by shifting the positioning member with respect to the developing container, while holding a regulating member by the positioning member.

Abstract: When the structure is arranged such that one of the repulsion poles is used as a developer layer thickness regulation pole, screw pitch-shaped density unevenness occurred at the rear end of a solid black image.

Abstract: In a developing device, a developer carrier carries developer and a control member controls the thickness of the developer on the developer carrier. A connection member that connects the control member to a main body of the developing device controls lateral movement of the control member and allows longitudinal movement of the control member with respect to the developing device main body.

Abstract: A developing apparatus capable of supplying a uniform thin layer of toner and of preventing toner scattering and leakage, comprising a supply roller for supplying toner to an outer peripheral surface of a toner carrier, the toner carrier for transferring the supplied toner by rotation and a layer thickness controlling member for controlling a thickness of the layer of the supplied toner at a predetermined value while making slide contact with the outer peripheral surface of the toner carrier via the toner, wherein the thin toner layer is supplied to an electrostatic latent image on an image carrier. The layer thickness controlling member is formed of an elastic plate to have a bent portion convex toward the toner carrier. The layer thickness controlling member is held by sealing members so that the bent portion makes elastic contact with the toner carrier outer peripheral surface over a nearly entire length of the toner carrier.

Abstract: A developing device includes: a multiple number of magnetic poles fixed at predetermined positions; a developer sleeve which rotatably encloses the magnetic poles; a doctor blade for regulating the thickness of the developer layer on the developer sleeve; and an agitating roller arranged adjacent to the developer sleeve and agitating and supplying the developer. In this arrangement, the magnetic poles include a development magnetic pole for developing the static latent image on the photoreceptor drum, and a developer conveyance magnetic pole positioned downstream, with resect to the rotational direction of the developer sleeve, of the development magnetic pole. A magnetic element is arranged opposing the developer sleeve outside the developer flow path where the magnetic field of the developer conveyance pole is not effective.

Abstract: A blade assembly for use in charging and metering marking particles in a development unit is provided. The blade assembly includes a shim and a polyurethane conformable base layer attached to the shim. The blade assembly also includes a low surface energy material coated on the polyurethane conformable base layer.

Abstract: A developing device for an image forming apparatus such as a copying machine, a printer, or the like to develop an electrostatic latent image on an image carrier includes a toner carrier which moves while carrying a toner on its surface, and a regulating member for regulating the amount of toner on the toner carrier by applying a moving force to the toner in a direction opposite to the moving direction of the toner carrier. In a regulating portion defined by the regulating member, a convey force received by a toner portion, which does not contact the surface of the toner carrier, from the regulating member is larger than a convey force received from the toner carrier.