JP2005208222A - Development apparatus, process cartridge, and electrophotographic image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain an electrically stable state in between a developing roller and a magnetic seal, in between a restricting member and the magnetic seal and in between the developing roller and the restricting member. <P>SOLUTION: The developing apparatus is provided with: the developing roller for feeding developer to an electrophotographic photoreceptor by being applied with a specific voltage value in order to develop an electrostatic latent image formed on the electrophotographic photoreceptor; the restricting member for restricting the thickness of layer of the developer attached to the periphery surface of the developing roller and provided with a blade abutted to the developing roller and a blade supporting member supporting the blade and voltage value which is the same as the voltage value applied to the developing roller is applied to the blade supporting member; the magic seal provided in a frame with a space between the developing roller and provided with a magnet and a conductive magnet supporting part installed on one end of the magnet in the longitudinal direction of the developing roller, and preventing leakage of the toner from the longitudinal direction of the developing roller; and a conductive member for electrically connecting the restricting member and the magnet supporting part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a developing device used in an electrophotographic image forming apparatus, a process cartridge that can be attached to and detached from a main body of the electrophotographic image forming apparatus, and an electrophotographic image forming apparatus.

  Here, the electrophotographic image forming apparatus forms an image on a recording medium using an electrophotographic image forming process. For example, an electrophotographic copying machine, an electrophotographic printer (for example, a laser beam printer, an LED printer, etc.), an electronic Includes photo facsimiles.

  The process cartridge is a cartridge in which at least a developing roller as process means and an electrophotographic photosensitive member are integrally combined to be detachable from the main body of the electrophotographic image forming apparatus.

  The developing device has at least a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive member.

  2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus that forms an image on a recording medium using an electrophotographic process, an electrophotographic photosensitive member and process means that act on the electrophotographic photosensitive member are integrally formed into a cartridge, and the process cartridge is an image. A process cartridge system that can be attached to and detached from the forming apparatus main body is employed. According to this process cartridge system, since the apparatus can be maintained by the user without using a service person, the operability can be remarkably improved. For this reason, this process cartridge system is widely used in image forming apparatuses.

  Seal members are provided at both ends of the developing roller incorporated in the process cartridge to prevent the developer from leaking out of the process cartridge. Conventionally, an elastic body such as felt or foamed rubber has been widely used as a seal member for preventing the developer from flowing out.

In the developing device having such a configuration, the elastic seal member is pressed against half of the outer peripheral surface of the developing roller. For this reason, toner may enter between the developing roller that rotates during the developing operation and the elastic seal member, and the torque of the developing roller may increase. For this reason, in order to solve these problems, a method has been proposed in which a magnetic seal member (hereinafter referred to as a magnetic seal) is arranged at both ends of the developing roller with a certain gap to prevent the developer from flowing out. Has been. And in patent document 1, the structure which made the developing roller 9c, the sheet-metal part 9d1 of the developing blade 9d, and the magnetic seal member 201 into the same electric potential stable state for high image quality is described. (See Patent Document 2 and FIG. 53).
JP 2000-131927 A

  However, although the image quality desired at that time was sufficiently satisfied, in recent years, further higher image quality has been demanded. That is, there has been a demand for a measure for electrically stabilizing the space between the developing roller and the magnetic seal, between the regulating member and the magnetic seal, and between the developing roller and the regulating member.

  Accordingly, an object of the present invention is to provide an electrically stable state between the developing roller and the magnetic seal, between the regulating member and the magnetic seal, and between the developing roller and the regulating member. An apparatus, a process cartridge, and an electrophotographic image forming apparatus are provided.

  In the present invention, a typical configuration for achieving the above object is to develop an electrostatic latent image formed on a frame and an electrophotographic photosensitive member in a developing device used in the electrophotographic image forming apparatus main body. A developing roller for supplying a developer to the electrophotographic photosensitive member by applying a predetermined voltage value; and a regulating member for regulating a layer thickness of the developer adhering to the peripheral surface of the developing roller, the developing roller A regulating member to which the same voltage value as that applied to the developing roller is applied to the blade support member, and a blade that contacts the blade, and a conductive blade support member that supports the blade; A magnetic seal provided on the frame body with a gap from the developing roller, comprising: a magnet; and a conductive magnet support provided on one end of the magnet in the longitudinal direction of the developing roller. The above It has a magnetic seal for preventing the longitudinal direction of the image roller of the toner from leaking, and a conductive member electrically connecting the regulating member and the magnet support portion, a developing device and a process cartridge.

  According to the present invention, it is possible to achieve an electrically stable state between the developing roller and the magnetic seal, between the regulating member and the magnetic seal, and between the developing roller and the regulating member.

  A developing device, a process cartridge, and an image forming apparatus according to the present invention will be described below with reference to the drawings.

  First, an embodiment of a laser beam printer as an electrophotographic image forming apparatus to which the present invention is applied will be described with reference to FIGS. In the laser beam printer A of this embodiment, a process cartridge B is detachably mounted.

  1 and 2, an image forming apparatus A forms an image on a recording medium 2 made of paper, synthetic resin, cloth or the like by an electrophotographic image forming process. First, the image forming apparatus A forms a toner image on a drum-shaped electrophotographic photosensitive member (hereinafter referred to as a photosensitive drum 7). Specifically, after the surface of the photosensitive drum 7 is charged by the charging roller 8, a laser beam corresponding to the image information is irradiated from the optical system 1 to the photosensitive drum 7 to form an electrostatic latent image corresponding to the image information. To do. The electrostatic latent image is developed by the developing means 9 to form a toner image. On the other hand, the recording medium 2 accommodated in the feeding cassette 3a is reversed and conveyed by the pickup roller 3b, the conveying roller pairs 3c and 3d, and the registration roller pair 3e in synchronization with the formation of the toner image.

  Next, the toner image formed on the photosensitive drum 7 of the cartridge B is transferred to the recording medium 2 by applying a voltage to the transfer roller 4. Thereafter, the recording medium 2 to which the toner image is transferred is conveyed to the fixing unit 5 by the conveyance guide 3f. The fixing means 5 has a driving roller 5c and a fixing roller 5b incorporating a heater 5a. Then, the toner image transferred by applying heat and pressure to the passing recording medium 2 is permanently fixed to the recording medium 2.

  In this embodiment, the pickup means 3b, the conveyance roller pairs 3c, 3d, the registration roller pair 3e, the conveyance guide 3f, the discharge roller pairs 3g, 3h, 3i, the discharge roller pair 3m, and the like constitute the conveyance means 3. The optical system 1 includes a laser diode 1a, a polygon mirror 1b, a lens 1c, a reflection mirror 1d, and the like.

  The electrostatic latent image is developed by the developing means 9 using magnetic toner as a developer. Here, the developing means 9 feeds the magnetic toner in the toner container 11a by the rotation of the toner feeding member 9b to feed the developing roller 9c with a built-in fixed magnet. Then, the developing roller 9c is rotated and a magnetic toner layer imparted with triboelectric charge by the developing blade 9d is formed on the surface of the developing roller 9c. Then, the magnetic toner is supplied to the developing area of the photosensitive drum 7. In the developing unit, a predetermined voltage value (developing bias) is applied from the power supply 25 to the developing roller 9c. Thereby, the magnetic toner is transferred to the photosensitive drum 7 in accordance with the electrostatic latent image. Then, the toner image is visualized. Here, the developing blade 9d defines the amount of magnetic toner on the peripheral surface of the developing roller 9c and applies a triboelectric charge. A toner agitating member 9e for circulating the magnetic toner in the developing chamber is rotatably attached in the vicinity of the developing roller 9c. Then, the toner image formed on the photosensitive drum 7 is transferred to a recording medium by applying a voltage having a reverse polarity to the toner image to the transfer roller 4, and then the magnetic toner remaining on the photosensitive drum 7 is removed by the cleaning unit 10. Remove. The cleaning means 10 scrapes off the magnetic toner remaining on the photosensitive drum 7 by an elastic cleaning blade 10a provided in contact with the photosensitive drum 7, and collects it in the waste toner reservoir 10b. The cartridge B is combined with a toner frame 11 having a toner container 11a for storing magnetic toner and a developing frame 12 holding a developing means 9 such as a developing roller 9c. The cleaning frame 10 attached with the cleaning means 10 such as the cleaning blade 10a and the charging roller 8 is combined. The cartridge B can be attached to and detached from the image forming apparatus main body 24 by an operator. That is, as shown in FIG. 1, the cartridge B is mounted by rotating the cover 35 provided on the upper part of the image forming apparatus main body 24 around its fulcrum 35a to be opened and inserting it in the direction of the arrow X. Can do. The cartridge B is provided with an exposure opening 1 e for irradiating the photosensitive drum 7 with laser light corresponding to image information and a transfer opening 13 a for facing the recording drum 2 to the photosensitive drum 7. Specifically, the exposure opening 1 e is provided in the cleaning frame 13, and the transfer opening 13 a is provided between the developing frame 12 and the cleaning frame 13.

  Next, the configuration of the magnetic toner seal around the developing roller 9c and the magnetic seal 14 will be described in detail with reference to FIGS.

  In FIG. 4, magnetic seals 14 are provided at both ends in the longitudinal direction of the developing roller 9c to prevent leakage of magnetic toner from the ends. The magnetic seal 14 is attached to the developing frame 12 with a predetermined gap between the magnetic seal 14 and the developing roller 9c. FIG. 5 is a cross-sectional view showing the positional relationship among the developing frame 12, the developing roller 9c, and the magnetic seal 14. As shown in FIG. A gap G1 is provided between the magnetic seal 14 and the outer peripheral surface of the developing roller 9c, and a gap G2 is provided between the magnetic seal 14 and the arc portion 12a of the developing frame 12. 6 and 7 are perspective views of the magnetic seal 14 according to the embodiment of the present invention. The magnetic seal 14 is provided with a magnet support portion 14b made of a metal material on the outer surface which is one end side of the magnet 14a in the longitudinal direction of the developing roller 9c. This magnet support part is a plate-like sheet metal member, and the material is SPCC plated with electrolytic nickel.

  The magnetic seal 14 will be described in more detail. The magnetic seal 14 has a substantially arc shape with a width of 3 to 4 mm, in which a magnet 14a as a constituent element thereof includes a nylon binder containing magnetic powder of Nd—Fe—B (rare earth magnet). It is an injection molded product having And the magnet support part 14b joined to the side surface (one end side in the longitudinal direction of the developing roller 9c) of the magnet 14 is a plate having a thickness of about 1 mm. The method of joining the magnet 14 a and the magnet support 14 b is by injection molding, and the magnet support 14 b is fixed in close contact with the side surface of the magnet 14. However, adhesive double-sided tape and adhesive bonding using only magnets may be used.

  Moreover, the magnet support part 14b has the positioning hole 14c for fitting with the fixing member 16 (after-mentioned) in the upper part. The magnetic seal 14 is positioned and fixed with respect to the developing frame 12 by fitting the positioning hole 14 c and the fixing member 15.

  Here, as shown in FIG. 8, a plurality of NS poles are magnetized on the inner circumferential surface (the surface facing the developing roller 9c) and the outer circumferential surface (the surface facing the arc portion 12a of the developing frame 12) of the magnet 14a. Has been. Magnetic brush spikes are formed in the gap G2 between the developing roller 9c and the gap G1 and the developing frame 12, and the toner can be prevented from leaking from the end of the developing roller 9c and the end of the developing frame 12. .

  In the conventional magnetic seal, a blade member or the like is used to seal between the developing frame and the magnetic seal. However, in this embodiment, the magnetic seal 14 is also sealed with the developing frame 12 by a magnetic force. Therefore, the blade material which has been used conventionally is abolished, and the assembly is facilitated and the cost is reduced. In this embodiment, the gap G2 (FIG. 5) is set to 0.1 to 0.7 mm, and the magnetic flux density due to the magnetic force of the magnetic seal 14 at that time is about 1000 to 2000 Gs on the developing roller 9c. , And about 1500 to 2500 Gs on the arc portion 12a of the developing device frame 12.

  By the way, in the positional relationship between the magnet 14a and the magnet support portion 14b in the magnetic seal 14, the magnet 14a is disposed on the opening side of the developing frame 12 as shown in FIG. The magnet support portions 14b are disposed at both end portions in the longitudinal direction).

  As described above, the magnet 14a is disposed on the opening side of the developing device frame 12, and the magnet support portion 14b is disposed outside the opening. As a result, as shown in FIG. 9 (viewed in the Y direction in FIG. 8), the magnetic force lines of the magnetic seal 14 are generated between the magnet 14a and the magnet support part 14b, and the magnetic force lines are a magnet support part having a high magnetic permeability. Head for 14b. Therefore, the magnetic lines of force that extend outside the width of the magnetic seal 14 are not generated. Therefore, the toner on the magnetic seal 14 does not spread outside the magnet support portion 14b. Therefore, it is possible to reliably hold the toner in a range where the magnetic force on the surface of the magnetic seal 14 is strong. Therefore, even when an impact or the like is applied when the user attaches / detaches the process cartridge A to / from the main body of the image forming apparatus, a good sealing property that prevents toner from leaking is obtained.

  Next, the spring member 15 will be described. FIG. 10 is a perspective view of a spring member 15 according to an embodiment to which the present invention is applied. The material of the spring member 15 is a conductive member such as stainless steel or phosphor bronze. The spring member 15 has arm portions 15a1 and 15a2 having spring elasticity. Therefore, in a state where the spring member 15 is attached to the developing device frame 12, it contacts the developing blade sheet metal 9d1 of the developing blade 9d and the magnet support portion 14b of the magnetic seal 14 with a predetermined contact force. Therefore, the developing blade sheet metal 9d1 and the magnetic seal 14 can be reliably contacted, and both members can be stably electrically connected via the spring member 15.

  The developing blade sheet metal 9d1 is applied with a voltage value substantially the same as the developing bias applied to the developing roller 9c. The developing blade sheet metal 9d1 and the magnet support portion 14b of the magnetic seal 14 are electrically connected with the spring member 15 in contact therewith. Therefore, the developing blade sheet metal 9d1, the magnetic seal 14, and the developing roller 9c have substantially the same potential. A voltage value is applied to the magnetic seal 14 at the magnet support 14b. Therefore, a voltage value substantially the same as the developing bias applied to the developing roller 9c is more reliably applied to the magnetic seal 14 itself. This is because the magnet 14a has an Nd-Fe-B (rare earth magnet) electrical resistivity of about 50 to 150 μΩ · cm, whereas the magnet support is made of SPCC (cold rolled steel). Is about 10 μΩ · cm. Therefore, the space between the developing roller 9c and the magnetic seal 14 and the space between the developing blade sheet metal 9d1 and the magnetic seal 14 are in an electrically stable state, and no electrical leakage occurs.

  The spring member 15 has a positioning hole 15b and a cut-and-raised portion 15c. The positioning hole 15b is fitted with a positioning boss 12b of the developing frame 12 described later, so that the spring member 15 is positioned with respect to the developing frame 12. On the other hand, the cut-and-raised part 15c is fitted to a fixed boss 12c of the developing device frame 12 described later. By inserting the fixed boss 12c into the cut and raised portion 15c, the edge portion of the cut and raised portion 15c bites into the fixed boss 12c. Therefore, the spring member 15 is prevented from being detached from the developing device frame 12. With the above configuration, the spring member 15 is positioned and fixed with respect to the developing frame 12.

  Next, the fixing member 16 will be described. It is a perspective view of the fixing member 16 which concerns on the Example of this invention to which FIG. 11 is applied. The fixing member 16 mainly has a boss portion 16a, a blade 16b, and a square portion 16c. The boss portion 16 a is fitted into the positioning hole 14 c of the magnet support portion 14 b of the magnetic seal 14 and the circular holes 12 f 1 and 12 f 2 of the developing device frame 12. Then, the magnetic seal 14 is positioned and fixed with respect to the developing device frame 12. On the other hand, the blade 16b is fitted into a claw 16b1 at the tip of the blade 16b and a square hole 12e of the developing device frame 12 described later. This prevents the fixing member 16 from falling off the developing frame 12. Further, a minute gap can be secured between the dimension of the rectangular portion 16c and the dimension of the square hole 12e of the developing device frame 12 into which the fixing member 16 described later is inserted. Therefore, a stable posture of the fixing member 16 in the square hole 12e is ensured and a guiding function at the time of insertion is achieved.

  Next, a method for attaching the developing frame 12 and the magnetic seal 14 according to the embodiment of the present invention will be described with reference to FIGS. The components related to the attachment, such as the magnetic seal 14 and the developing blade 9d, are attached to both ends in the longitudinal direction of the developing frame 12, but only one side will be described because it is symmetrical about the center of the image.

  12 to 14 are exploded perspective views of the developing frame 12 according to the embodiment to which the present invention is applied. As shown in FIG. 12, a fitting hole 12 d into which the fixing member 16 is inserted and a groove portion 12 g into which the magnetic seal 14 is fitted are provided on the side surface of the developing device frame 12.

  Further, as shown in FIG. 13, a positioning boss 12b for positioning the spring member 15 and a fixing boss 12c for fixing are provided. Further, a square hole 12e for fitting with the claw 16b1 of the blade 16b of the fixing member 16, a positioning boss 12i for positioning the developing blade 9d on the developing frame 12, and a screw hole 12h for fixing with screws are provided. Has been.

  Further, as shown in FIG. 14, circular holes 12 f 1 and 12 f 2 that are fitted into the boss portions 16 a of the fixing member 16 are provided.

  15 and 16, the positioning boss 12b of the developing frame 12, the positioning hole 15b of the spring member 15, the fixed boss 12c, and the cut-and-raised portion 15c are inserted as described above as the first step. Thereby, the spring member 15 is attached to the developing device frame 12. The cut-and-raised portion 15 c is inserted into the fixed boss 12 c by the insertion, and the spring member 15 is fixed to the developing container 12. Therefore, the spring member 15 is prevented from being detached from the developing device frame 12.

  17 and 18, the magnetic seal 14 is fitted into the groove 12g of the developing device frame 12 as the second step. At this time, the arm portion 15a1 of the spring member 15 and the inside of the magnet support portion 14b of the magnetic seal 14 are brought into contact with the arm portion 15a1 with the urging force simultaneously with the fitting. The position where the arm portion 15a1 contacts is a position 14c1 below the positioning hole 14c of the magnetic seal 14 in a state where the magnetic seal 14 is attached to the developing frame 12. By this urging force, the spring member 15 and the magnetic seal 14 always ensure electrical continuity.

  19 and 20, the magnetic seal 14 is fixed to the developing frame 12 as a third step. After fitting the magnetic seal 14, the fixing member 16 is inserted into the fitting hole 12 d of the developing device frame 12. Simultaneously with the insertion, the boss portion 16 a of the fixing member 16 passes through the circular holes 12 f 1 and 12 f 2 and the positioning hole 14 c of the magnetic seal 14. The boss diameter of the boss portion 16a and the hole diameters of the circular holes 12f1 and 12f2 and the positioning hole 14c are fitted to each other with a minute interval. The magnetic seal 14 is rotated about the positioning hole 14 c by the urging force of the spring member 15, but the rotation restricting portion 14 a 1 provided in the magnet 14 a comes into contact with the developing device frame 12. Therefore, the magnetic seal 14 is positioned in the direction intersecting with the longitudinal direction of the developing roller 9c. Further, the dimensions of the rectangular portion 16c of the fixing member 16 and the fitting hole 12d of the developing device frame 12 are fitted with a small interval. Therefore, the rotation of the fixing member 16 with respect to the developing frame 12 can be prevented after insertion. Further, simultaneously with the insertion, the claw 16 b 1 of the blade 16 b of the fixing member 16 falls into the square hole 12 e of the developing device frame 12. As a result, the fixing member 16 can be prevented from falling off the developing device frame 12. 21 to 23, the developing blade 9d is attached to the developing device frame 12 as the fourth step. The developing blade 9d is positioned on the developing frame 12 by fitting the positioning hole 9d1 of the developing blade 9d to the positioning boss 12i of the developing frame 12. Next, the screw 17 is passed through the through hole 9d2 and fixed to the screw hole 12h of the developing device frame 12. Accordingly, the developing blade 9d of the developing frame 12 can be fixed to the developing blade 9d. At this time, the arm portion 15a2 of the spring member 15 and the developing sleeve 9d come into contact with each other with the urging force of the arm portion 15a2. By this urging force, the spring member 15 and the developing blade 9d can always ensure electrical continuity.

1 is an external perspective view of an electrophotographic image forming apparatus according to an embodiment of the present invention. 1 is a side sectional view of an electrophotographic image forming apparatus according to an embodiment of the present invention. The process cartridge which concerns on one Embodiment of this invention is also a sectional side view. 1 is an external perspective view of a magnetic seal and a developing roller according to an embodiment of the present invention. FIG. 5 is a side sectional view showing a relationship between a developing frame, a developing roller, and a magnetic seal in a developing device according to an embodiment of the present invention. 1 is an external perspective view of a magnetic seal according to an embodiment of the present invention. 1 is an external perspective view of a magnetic seal according to an embodiment of the present invention. It is a side view which shows the magnetic field generation condition of the magnetic seal which concerns on one Embodiment of this invention. FIG. 9 is an enlarged detail view of a Y part in FIG. 8. It is an appearance perspective view of a spring member concerning one embodiment of the present invention. It is an appearance perspective view of a fixing member concerning one embodiment of the present invention. FIG. 3 is a perspective view of an end portion of a developing device frame according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a developing frame end according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a developing frame end according to an embodiment of the present invention. It is a perspective view of a developing frame end and a spring member showing a spring member attachment method concerning one embodiment of the present invention. It is a front view of a developing frame end and a spring member showing a spring member attachment method concerning one embodiment of the present invention. FIG. 3 is a perspective view of a developing frame end and a magnetic seal showing a magnetic seal attaching method according to an embodiment of the present invention. It is a front view of a development frame body end and a magnetic seal which shows a magnetic seal attachment method concerning one embodiment of the present invention. FIG. 5 is a perspective view of the fixing frame end and the fixing member showing the fixing member attaching method according to the embodiment of the present invention. FIG. 6 is a front view of a developing frame end and a fixing member showing a fixing member attaching method according to an embodiment of the present invention. FIG. 6 is a perspective view of the developing frame end and the developing blade showing the developing blade mounting method according to the embodiment of the present invention. FIG. 5 is a front view of the developing frame end and the developing blade showing the developing blade mounting method according to the embodiment of the present invention. FIG. 6 is a perspective view of an end portion of a developing unit according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical system 1a Laser diode 1b Polygon mirror 1c Lens 1d Reflection mirror 1e Exposure opening part 2 Recording medium 3 Conveyance means 3a Feed cassette 3b Pickup roller 3c Conveyance roller 3d Conveyance roller 3e Registration roller pair 3f Conveyance guide 3g Discharge roller pair 3h Discharge roller pair 3h Roller pair 3i discharge roller pair 3j reverse path 3k flapper 3m discharge roller pair 4 transfer roller 5 fixing means 5a heater 5b fixing roller 5c drive roller 6 discharge roller 7 photosensitive drum 8 charging roller 9 developing means 9b toner feeding member 9c developing roller 9d Developing blade 9d1 Positioning hole 9d2 Through hole 9e Toner stirring member 10 Cleaning means 10a Elastic cleaning blade 10b Waste toner reservoir 11 Toner frame 11a Toner container 12 Developing frame 12a Arc part 12b Positioning boss 12c Fixed boss 12d Mating hole 12e Square hole 12f1 Circular hole 12f2 Circular hole 12g Groove part 12h Screw hole 12i Positioning boss 13 Cleaning frame 13a Transfer opening part 14 Magnetic seal 14a Magnet 14b Magnet support part 14c Positioning hole 15c Member 15a1 Arm portion 15a2 Arm portion 15b Positioning hole 15c Cut and raised portion 16 Fixing member 16a Boss portion 16b Blade 16b1 Claw 16c Square portion 17 Screw 24 Image forming apparatus 25 Power supply 35 Cover 35a Support point A Laser beam printer B Process cartridge G1 Micro gap G2 Minute gap W1 Width A Direction C Direction D Direction

Claims (14)

In the developing device used in the electrophotographic image forming apparatus main body,
A frame,
In order to develop the electrostatic latent image formed on the electrophotographic photosensitive member, a developing roller to which a predetermined voltage value is applied and supplies a developer to the electrophotographic photosensitive member;
A regulating member that regulates the layer thickness of the developer that adheres to the peripheral surface of the developing roller, the blade including a blade that contacts the developing roller, and a conductive blade support member that supports the blade; A regulating member to which the same voltage value as the voltage value applied to the developing roller is applied to the support member;
A magnetic seal provided on the frame body with a gap from the developing roller, comprising: a magnet; and a conductive magnet support provided on one end side of the magnet in the longitudinal direction of the developing roller. A magnetic seal that prevents the toner from leaking from the longitudinal direction of the developing roller;
A conduction member that electrically connects the restriction member and the magnet support;
A developing device comprising:   The developing device according to claim 1, wherein the magnet support portion has an electrical resistivity smaller than that of the magnet.   The developing device according to claim 1, wherein the magnet support portion includes a positioning portion for positioning the magnetic seal on the frame body. Furthermore, the developing device
A fixing member for fixing the magnetic seal to the frame;
The developing device according to claim 3, wherein the positioning portion is a hole through which the fixing member is fitted. The conducting member has a contact portion for energizing the magnet support portion and electrically connecting the regulating member,
5. The development according to claim 3, wherein the contact portion biases a position below the positioning portion in the magnet support portion in a direction intersecting with a longitudinal direction of the developing roller. apparatus.   The said magnetic seal has a rotation control part which contact | abuts to the said frame and is controlled by the said contact part, and controls rotating around the said positioning part. The developing device described. In the process cartridge that can be attached to and detached from the electrophotographic electrophotographic image forming apparatus main body,
An electrophotographic photoreceptor, a frame,
In order to develop the electrostatic latent image formed on the electrophotographic photosensitive member, a developing roller to which a predetermined voltage value is applied and supplies a developer to the electrophotographic photosensitive member;
A regulating member that regulates the layer thickness of the developer that adheres to the peripheral surface of the developing roller, the blade including a blade that contacts the developing roller, and a conductive blade support member that supports the blade; A regulating member to which the same voltage value as the voltage value applied to the developing roller is applied to the support member;
A magnetic seal provided on the frame body with a gap from the developing roller, comprising: a magnet; and a conductive magnet support provided on one end side of the magnet in the longitudinal direction of the developing roller. A magnetic seal that prevents the toner from leaking from the longitudinal direction of the developing roller;
A conduction member that electrically connects the restriction member and the magnet support;
A process cartridge comprising:   The developing device according to claim 7, wherein the magnet support portion has an electrical resistivity smaller than that of the magnet.   The process cartridge according to claim 8, wherein the magnet support portion includes a positioning portion for positioning the magnetic seal on the frame body. Further, the process cartridge is
A fixing member for fixing the magnetic seal to the frame;
The process cartridge according to claim 9, wherein the positioning portion is a hole through which the fixing member is fitted. The conducting member has a contact portion for electrically connecting to the magnet support portion,
The said contact part urges | biases the said magnet support part below the said positioning part in the said magnet support part in the direction which cross | intersects the longitudinal direction of the said developing roller. The described process cartridge.   The magnetic seal includes a rotation restricting portion that is urged by the contact portion to abut against the frame body and restricts the magnetic seal from rotating around the positioning portion. The process cartridge according to claim 11. In an electrophotographic image forming apparatus for forming an image on a recording medium,
(I) a power supply;
(Ii) A developing device used in the main body of the electrophotographic image forming apparatus, wherein a predetermined voltage value is applied from the power source to develop the frame and the electrostatic latent image formed on the electrophotographic photosensitive member. A developing roller that supplies the developer to the electrophotographic photosensitive member, a regulating member that regulates a layer thickness of the developer adhering to the circumferential surface of the developing roller, a blade that contacts the developing roller, and the blade A conductive blade supporting member for supporting the developing roller, and a regulating member to which the same voltage value as the voltage value applied to the developing roller is applied to the blade supporting member from the power source, and a gap between the developing roller and the developing roller. A magnetic seal provided on the frame body, the magnet, and a conductive magnet support provided on one end side of the magnet in the longitudinal direction of the developing roller; Longitudinal direction A developing device including a magnetic seal, and a conductive member for connecting said regulating member and said magnet and a support portion electrically to prevent al the toner from leaking,
(Iii) transport means for transporting the recording medium;
An electrophotographic image forming apparatus comprising: In an electrophotographic image forming apparatus in which a process cartridge is detachable and forms an image on a recording medium.
(I) a mounting portion for detachably mounting the process cartridge;
(Ii) a power supply;
(Iii) A process cartridge mounted on the mounting portion, wherein the electrophotographic photosensitive member, the frame, and the electrostatic latent image formed on the electrophotographic photosensitive member are developed from the power source in a predetermined manner. A developing roller that supplies a developer to the electrophotographic photosensitive member with a voltage value applied thereto, and a regulating member that regulates a layer thickness of the developer attached to the peripheral surface of the developing roller, the blade being in contact with the developing roller And a conductive blade support member that supports the blade, and a regulating member to which the same voltage value as that applied to the developing roller is applied to the blade support member from the power source, and the development A magnetic seal provided on the frame with a gap between the roller and a magnet, and a conductive magnet support provided on one end of the magnet in the longitudinal direction of the developing roller, The present A process cartridge having a magnetic seal, and a conductive member electrically connecting the regulating member and the magnet support portion for preventing the longitudinal direction of the roller of the toner from leaking,
(Iv) transport means for transporting the recording medium;
An electrophotographic image forming apparatus comprising:

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