JP2005043515A - Developing device for image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a developed image of high quality by preventing a developer of a low toner concentration ratio peeled from magnetic brush rollers by peeling magnetic poles after the end of development from directly readhering to clamping magnetic poles thereby preventing the image defect to bring about the degradation in image density in a part of the toner image. <P>SOLUTION: Peeling assistance magnets 24Y, 24M and 24C which generate the magnetic fields in the direction of parting the developer from the magnetic brush rollers 38Y, 38M and 38C between themselves and the peeling magnetic poles N2 are attached to the external walls of cover sections 23Y, 23M and 23C facing the peeling magnetic poles N2 of developing containers 17Y, 17M and 17C. The developer peeled by the peeling magnetic poles N2 is directed by centrifugal force and the magnetic fields toward the peeling assistance magnets 24Y, 24M and 24C, by which the developer is dropped onto mixing augers 21Y, 21M and 21C parted from the clamping magnetic poles N3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a developing device in an image forming apparatus that is used in an image forming apparatus such as a copying machine, a printer, and a facsimile machine, and performs development by a magnetic brush developing roller.
[0002]
[Prior art]
As a developing device such as an electrophotographic copying machine or printer, which uses a magnetic brush developing roller, as shown in FIG. 5, in recent years, a developing magnetic pole n1, a conveying magnetic pole s1, a peeling magnetic pole n2, a gripping magnetic pole n3, And the magnetic brush roller 1 rotating the sleeve 1b around the magnet roller 1a having the blade regulating magnetic pole s2 in the direction of the arrow q, and supplying the developer 7 in the developing container 3 to the photosensitive drum 4 while pumping up the developer 7 in the direction of the arrow q. The developing device 6 is being put to practical use.
[0003]
In the developing device 6, after the development is completed, the used developer 7 conveyed into the developing container 3 is peeled off from the magnetic brush roller 1 by the peeling magnetic pole n2, and separated from the magnetic brush roller 1 by centrifugal force. It falls into the developing container 3 while facing, and is used again for development after stirring by the mixer 7.
[0004]
However, although centrifugal force acts on the developer peeled off from the magnetic brush roller 1 by the peeling magnetic pole n2 after the development is completed, the dropping position in the developing container 3 cannot be separated from the gripping magnetic pole n3. For this reason, if the peeled developer falls near the gripping magnetic pole n3, and a thin developer having a low toner ratio already used for development and directly adheres to the gripping magnetic pole n3, the developer having a thin concentration is used. As a result, there is a risk that the image density is lowered in a part of the toner image, causing an image defect, and the image quality is lowered.
[0005]
[Problems to be solved by the invention]
Accordingly, the present invention solves the above-described problem, and prevents the developer having a low concentration peeled from the peeled magnetic pole of the magnetic brush roller from directly adhering to the magnetic pole, thereby reducing the density at the position of the image. An object of the present invention is to provide a developing device for an image forming apparatus which prevents image defects and obtains a high-quality developed image having a uniform density over the entire surface.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a developing container having an opening at a position facing the image carrier, a developing magnetic pole located at the opening of the developing container and facing the image carrier, and the development A transport magnetic pole that is positioned above the magnetic pole and transports the developer that has passed through the developing magnetic pole into the developer container, a peeling magnetic pole that peels off the developer transported by the transport magnetic pole, and a developer container that is positioned below the peeling magnetic pole A magnetic brush roller that has a grabbing magnetic pole for grabbing the developer therein, and applies the developer grabbed by the grabbing magnetic pole to the electrostatic latent image on the image carrier by the developing magnetic pole, and the peeling magnetic pole And a peeling assisting member that generates a magnetic field in a direction away from the magnetic brush roller when the developer is peeled off from the magnetic brush roller by the peeling magnetic pole at a position opposite to the developing container. Than it is.
[0007]
With the above-described configuration, the present invention generates a magnetic field in a direction in which the developer is further separated from the magnetic brush by the separation magnetic pole by the separation assisting member, so that the developer is grabbed and dropped far from the magnetic pole and separated from the separation magnetic pole. The developer is prevented from being directly gripped and reattached to the magnetic pole, thereby obtaining a high-quality developed image having a uniform density free from image defects.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the first embodiment shown in FIGS. FIG. 1 is a schematic configuration diagram showing an image forming unit 10 of an image forming apparatus according to an embodiment of the present invention. Around the photosensitive drum 11 that is an image carrier of the image forming unit 10, a charger 12 that uniformly charges the photosensitive drum 11 sequentially in accordance with the rotation of the photosensitive drum 11 in the direction of arrow s, and a charged photosensitive member. An irradiation position 14 of a laser beam 13a from a laser writing unit 13 which is a latent image forming unit for forming a latent image on the drum 11, developing devices 16Y and 16M for yellow (Y), magenta (M), and cyan (C). , 16C, and a revolver device 19 that rotates in the direction of arrow t, an intermediate transfer device 41 having an intermediate transfer belt 41a that rotates in the direction of arrow u, a cleaner device 42, and a static elimination lamp 43.
[0009]
The laser writing unit 13 forms an electrostatic latent image on the photosensitive drum 11 by irradiating laser light corresponding to a writing signal for each color in accordance with image information input from an external computer terminal or the like. As shown in FIG. 2, the developing devices 16Y, 16M, and 16C are developers including three color toners of yellow (Y), magenta (M), and cyan (C) and a carrier in the developing containers 17Y, 17M, and 17C. 18Y, 18M, and 18C, respectively. The revolver 19 rotates the yellow (Y), magenta (M), and cyan (C) developing devices 16Y, 16M, and 16C as a result of the rotation, so that the desired developing devices 16Y, 16M, and 16C are transferred to the photoconductor. Opposing to the drum 11.
[0010]
The developing devices 16Y, 16M, and 16C for yellow (Y), magenta (M), and cyan (C) are arranged around the magnet rollers 36Y, 36M, and 36C and the magnet rollers 36Y, 36M, and 36C in the developing containers 17Y, 17M, and 17C. Magnetic brush rollers 38Y, 38M, and 38C including rotating developing sleeves 37Y, 37M, and 37C are provided. Further, the developing devices 16Y, 16M, and 16C include yellow (Y), magenta (M), and cyan (C) toners supplied from the toner cartridges 31, 32, and 33, and developers in the developing containers 17Y, 17M, and 17C. Are transported and fed to the magnetic brush rollers 38Y, 38M, and 38C, and the feeding augers 20Y, 20M, and 20C and the mixing augers 21Y, 21M, and 21C are provided. The developing sleeves 37Y, 37M, and 37C of the magnetic brush rollers 38Y, 38M, and 38C rotate in the arrow v direction during the developing operation.
[0011]
Each of the magnet rollers 36 </ b> Y, 36 </ b> M, 36 </ b> C has an N-polar developing magnetic pole N <b> 1 that performs development by supplying a developer onto the photosensitive drum 11 at a position facing the photosensitive drum 11. The magnet rollers 36Y, 36M, and 36C sequentially transfer the developer after the development into the developing containers 17Y, 17M, and 17C from the developing magnetic pole N1 in the counterclockwise direction of FIG. Grasp new developer supplied to the developing magnetic pole N1 with the same polarity as the separating magnetic pole N2 and the separating magnetic pole N2 for separating the developer conveyed with the opposite polarity to the conveying magnetic pole S1 and the conveying magnetic pole S1 from the magnetic brush rollers 38Y, 38M and 38C. For the gripping magnetic pole N3 and the doctor blades 22Y, 22M, and 22C of the developing containers 17Y, 17M, and 17C for making the developer on the magnetic brush rollers 38Y, 38M, and 38C into a thin layer with a polarity opposite to that of the gripping magnetic pole N3 It has an opposing blade regulating magnetic pole S2.
[0012]
The outer wall of the cover portions 23Y, 23M, and 23C covering the magnetic brush rollers 38Y, 38M, and 38C of the developing containers 17Y, 17M, and 17C is a peeling auxiliary member that faces the peeling magnetic pole N2 having N polarity and a magnetic force of 350 [Gauss]. A certain plate-like peeling auxiliary magnet 24Y, 24M, 24C is attached with a double-sided tape. The surfaces of the separation assisting magnets 24Y, 24M, and 24C that face the separation magnetic pole N2 have an S polarity opposite to the separation magnetic pole N2 and a magnetic force of 220 to 320 [Gauss], and the developer is between the separation magnetic pole N2. Is generated in a direction away from the magnetic brush rollers 38Y, 38M, and 38C. As a result, in the separation magnetic pole N2, a magnetic field directed toward the transport magnetic pole S1 indicated by a dotted line α in FIG. 3 and a magnetic field directed toward separation auxiliary magnets 24Y, 24M, and 24C indicated by a dotted line β are generated.
[0013]
The upper ends of the auxiliary peeling magnets 24Y, 24M, 24C are inclined at 57 ° with respect to a horizontal line passing through the centers of the magnet rollers 36Y, 36M, 36C so as to be 7.9 mm in the horizontal direction and 4 mm in the vertical direction from the peeling magnetic pole N2. Are attached to the cover portions 23Y, 23M, and 23C. The peeling auxiliary magnets 24Y, 24M, and 24C have the same length as the magnet rollers 36Y, 36M, and 36C, and are formed with a width of 5 mm and a thickness of 1 mm.
[0014]
When the upper end of the auxiliary peeling magnets 24Y, 24M, and 24C is too close to the peeling magnetic pole N2, the falling angle of the peeled developers 18Y, 18M, and 18C does not change so much, and reattachment to the gripping magnetic pole N3 occurs. In addition, even if the upper ends of the peeling auxiliary magnets 24Y, 24M, 24C are too far from the peeling magnetic pole N2, no magnetic field is generated between the peeling magnetic pole N2 and the peeling auxiliary magnets 24Y, 24M, 24C, and the separated developer 18Y, Since the drop angles of 18M and 18C do not change and reattach to the gripping magnetic pole N3, the upper end positions of the separation assisting magnets 24Y, 24M and 24C are 6.5 to 9.0 mm in the horizontal direction from the separation magnetic pole N2. It is preferable to separate the distance of about 2.5 to 5.8 mm in the vertical direction.
[0015]
Next, a color image forming process by the image forming unit 10 will be described. In the image forming unit 10, toner images are superimposed in the order of yellow (Y), magenta (M), and cyan (C) to form a color image. At the start of image formation, the magnetic brush roller 38Y of the yellow (Y) developing device 16Y attached to the revolver device 19 is disposed opposite the developing position of the photosensitive drum 11.
[0016]
When the image forming process is started, the photosensitive drum 11 rotates in the direction of the arrow s, and is uniformly charged by the charger 13 according to the rotation, and the laser corresponding to the yellow image signal is output from the laser writing unit 13 at the irradiation position 14. Irradiated with light, an electrostatic latent image of a yellow image is formed on the photosensitive drum 11 and reaches the revolver device 19. In the revolver device 19, the developing sleeve 37Y of the magnetic brush roller 38Y of the yellow (Y) developing device 16Y rotates in the direction of the arrow v.
[0017]
Due to the rotation of the developing sleeve 37Y, the magnetic brush roller 38Y obtains the developer 18Y with the gripping magnetic pole N3, and then regulates the spikes by the doctor blade 22Y with the blade regulating magnetic pole S2. Next, toner is applied to the electrostatic latent image on the photosensitive drum 11 at the developing magnetic pole N 1 to form a yellow (Y) toner image on the photosensitive drum 11. After the completion of development, the spikes on the magnetic brush roller 38Y are transported into the developing container 17Y by the transport magnetic pole S1, and are peeled off from the magnetic brush roller 38Y by the peeling magnetic pole N2.
[0018]
Since the separation magnetic pole N2 generates a magnetic field directed to the separation assisting magnet 24Y indicated by the dotted line β in FIG. 3, the developer 18Y separated from the magnetic brush roller 38Y by the separation magnetic pole N2 is subjected to centrifugal force by the magnetic brush roller 38Y. , While moving in the direction of the arrow w that is separated from the magnetic brush roller 38Y by the magnetic field and attracted to the peeling assisting magnet 24Y side, falls on the mixing auger 21Y away from the gripping magnetic pole N3 and moves in the developing container 17Y. And mixed with newly supplied developer. In the gripping magnetic pole N3, the developer peeled off from the peeling magnetic pole N2 is not directly gripped, and a new developer having a predetermined toner concentration ratio is supplied from the mixing auger 21Y in succession with sufficient agitation. A developer having a predetermined toner concentration ratio is supplied to the developing magnetic pole N1 through the magnetic pole S2.
[0019]
After the development, the yellow toner image formed on the photosensitive drum 11 reaches a contact position with the intermediate transfer belt 41a rotated in the direction of the arrow u, and is electrostatically primary-transferred onto the intermediate transfer belt 41a. . After the primary transfer, the photosensitive drum 11 is cleaned of residual toner by the cleaner device 42 and the surface charge is removed by the charge eliminating lamp 43. Next, similarly to the yellow toner image forming process, the magenta and cyan toner image forming processes are sequentially repeated on the photosensitive drum 11, and further, yellow (Y) and magenta (from the photosensitive drum 11 onto the intermediate transfer belt 41 a. M) and cyan (C) toner images are sequentially intermediate transferred to form a color toner image in which the three color toner images are superimposed on the intermediate transfer belt 41a.
[0020]
During this time, the revolver device 19 is sequentially rotated in the direction of the arrow t, and magnetic brush rollers 38Y, 38M, and 38C corresponding to the color of the toner image formed on the photosensitive drum 11 are disposed to face the photosensitive drum 11. The yellow (Y), magenta (M), and cyan (C) color toner images superimposed on the intermediate transfer belt 41a are collectively secondarily transferred to the recording paper P or the like to complete a color image on the recording paper P.
[0021]
While the image forming process is repeated in this manner, in the developing containers 17Y, 17M, and 17C, the developers 18Y, 18M, and 18C peeled off from the magnetic brush rollers 38Y, 38M, and 38C by the peeling magnetic pole N2 after the development is finished. While being pulled in the direction of the auxiliary peeling magnets 24Y, 24M, and 24C without falling near the gripping magnetic pole N3, it is surely dropped onto the mixing augers 21Y, 21M, and 21C, and after sufficient stirring, is again applied to the gripping magnetic pole N3. Supplied.
[0022]
According to the first embodiment, the peeling auxiliary magnets 24Y, 24M, and 24C are attached to the outer walls of the cover portions 23Y, 23M, and 23C facing the peeling magnetic pole N2 of the developing containers 17Y, 17M, and 17C, and the peeling magnetic poles are attached. A magnetic field is generated from N2 toward the auxiliary peeling magnets 24Y, 24M, and 24C. Accordingly, the separation assisting magnets 24Y, 24M, and 24M are separated by the centrifugal force and the magnetic field without dropping the developers 18Y, 18M, and 18C separated from the magnetic brush rollers 38Y, 38M, and 38C by the separation magnetic pole N2 near the lower gripping magnetic pole N3. It can fall on the mixing augers 21Y, 21M, and 21C away from the gripping magnetic pole N3 while moving in the 24C direction.
[0023]
As a result, a thin developer having a low toner ratio after development is not directly reattached to the gripping magnetic pole N3, and the gripping magnetic pole N3 is sufficiently stirred by the mixing augers 21Y, 21M, and 21C, Since the developers 18Y, 18M, and 18C having the toner density ratio are supplied, the toner image developed by the developing magnetic pole N1 has a sufficient image density over the entire surface and a high image quality with a uniform image density over the entire surface. can get.
[0024]
Further, according to the first embodiment, since the magnetic force can be weakened by attaching the auxiliary peeling magnets 24Y, 24M, and 24C to the outer walls of the cover portions 23Y, 23M, and 23C, the released developers 18Y, 18M, and 18C are covered by the cover. The developers 18Y, 18M, and 18C can be appropriately attracted by the magnetic field without adhering to the peeling auxiliary magnets 24Y, 24M, and 24C of the portions 23Y, 23M, and 23C.
[0025]
Next, the present invention will be described with reference to a second embodiment shown in FIG. The second embodiment is different from the first embodiment in the structure of the developing device, and the other parts are the same as those in the first embodiment. Description is omitted.
[0026]
On the outer walls of the cover portions 23Y, 23M, and 23C of the developing containers 17Y, 17M, and 17C of the second embodiment, plate-like peeling auxiliary iron plates 28Y, 28M, and 28C that are peeling auxiliary members are attached. The peeling auxiliary iron plates 28Y, 28M, and 28C are magnetized by the peeling magnetic pole N2 to the S polarity opposite to the peeling magnetic pole N2. Thereby, in the peeling magnetic pole N2, a magnetic field directed to the peeling auxiliary iron plates 28Y, 28M, and 28C is generated.
[0027]
The upper ends of the peeling auxiliary iron plates 28Y, 28M, and 28C are inclined at 57 ° with respect to a horizontal line passing through the centers of the magnet rollers 36Y, 36M, and 36C so as to be 7.9 mm horizontally and 4 mm apart from the peeling magnetic pole N2. Are attached to the cover portions 23Y, 23M, and 23C. The peeling auxiliary magnets 24Y, 24M, and 24C have the same length as the magnet rollers 36Y, 36M, and 36C, and are formed with a width of 5 mm and a thickness of 1 mm.
[0028]
Further, inclined plates 26Y, 26M, and 26C are installed between the separation magnetic pole N2 and the gripping magnetic pole N3 in the developing containers 17Y, 17M, and 17C. The inclined plates 26Y, 26M, and 26C are inclined toward the mixing augers 21Y, 21M, and 21C, and their upper ends 27Y, 27M, and 27C are spaced from the magnetic brush rollers 38Y, 38M, and 38C by about 0.5 mm. The distances of the inclined plates 26Y, 26M, and 26C from the magnetic brush rollers 38Y, 38M, and 38C may be in a range that does not contact the magnetic brush rollers 38Y, 38M, and 38C.
[0029]
In the developing process, for example, in the yellow (Y) developing device 16Y, the developer 18Y transported into the developing container 17Y by the transport magnetic pole S1 after the completion of the development at the developing magnetic pole N1 is separated from the magnetic brush by the separation magnetic pole N2. It is peeled off from the roller 38Y. Since the separation magnetic pole N2 generates a magnetic field directed toward the separation assisting iron plate 28Y, the developer 18Y separated from the magnetic brush roller 38Y by the separation magnetic pole N2 is moved away from the magnetic brush roller 38Y by the centrifugal force and the magnetic field. It falls while facing the direction of the arrow x attracted to the iron plate 28Y side.
[0030]
The developer 18Y falls on the inclined plate 26Y, and is further fed along the inclination of the inclined plate 26Y in the direction of the mixing augers 21Y, 21M, and 21C, falls on the mixing augers 21Y, 21M, and 21C, and enters the developing container 17Y. And mixed with the newly supplied developer 18Y. The gripping magnetic pole N3 is sequentially supplied from the mixing auger 21Y with a new developer 18Y sufficiently stirred and having a predetermined toner concentration ratio, and supplied with a predetermined toner concentration ratio to the developing magnetic pole N1 via the blade regulating magnetic pole S2. Will be.
[0031]
That is, while the image forming process is repeated, in the developing containers 17Y, 17M, and 17C, the developers 18Y, 18M, and 18C peeled off from the magnetic brush rollers 38Y, 38M, and 38C by the peeling magnetic pole N2 after the development is completed. After falling on the inclined plates 26Y, 26M, and 26C while being pulled in the direction of the peeling auxiliary iron plates 28Y, 28M, and 28C without falling near the gripping magnetic pole N3, it is surely dropped on the mixing augers 21Y, 21M, and 21C, After sufficiently stirring, it is supplied again to the gripping magnetic pole N3.
[0032]
According to the second embodiment, the separation magnetic pole N2 generates a magnetic field from the separation magnetic pole N2 toward the separation auxiliary iron plates 28Y, 28M, 28C. Accordingly, the developers 18Y, 18M, and 18C separated from the magnetic brush rollers 38Y, 38M, and 38C by the separation magnetic pole N2 can be dropped while being directed toward the separation assisting iron plates 28Y, 28M, and 28C by centrifugal force and magnetic field. In addition, by providing the inclined plates 26Y, 26M, and 26C between the separation magnetic pole N2 and the gripping magnetic pole N3, it is possible to more reliably prevent the separated developer from dropping near the gripping magnetic pole N3, and mixing away from the gripping magnetic pole N3. Can drop on augers 21Y, 21M, 21C.
[0033]
As a result, a thin developer having a small toner ratio after development is not reattached to the gripping magnetic pole N3 as it is, and the gripping magnetic pole N3 is sufficiently stirred by the mixing augers 21Y, 21M, and 21C, Since the developer having the toner density ratio is supplied, the toner image developed by the developing magnetic pole N1 can obtain a high image quality having a sufficient and uniform image density over the entire surface. Further, by attaching the peeling auxiliary iron plates 28Y, 28M, and 28C to the outer walls of the cover portions 23Y, 23M, and 23C, the developer does not adhere to the peeling auxiliary magnets 24Y, 24M, and 24C portions of the cover portions 23Y, 23M, and 23C. In addition, the developer can be appropriately attracted by the magnetic field.
[0034]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the developing device is not limited to the one mounted on the revolver device, The color of the toner used is not limited. Further, the material and shape of the peeling assisting member are not limited as long as it generates a magnetic field that attracts the developer in the direction of the peeling assisting member between the peeling magnetic poles. The mounting position and mounting method of the peeling auxiliary member are also arbitrary. For example, depending on the shape of the developing container, the gap between the peeling magnetic pole and the cover portion is wide, and the magnetic field between the peeling auxiliary member is set to the extent that the developer does not adhere If possible, a peeling assisting member may be attached to the inner wall of the cover portion. Also, the mounting position of the inclined plate is not limited.
[0035]
【The invention's effect】
As described above in detail, according to the present invention, a separation assisting member is provided and a magnetic field is generated between the separation magnetic pole and the developer separated by the separation magnetic pole is attracted in the direction of the separation assisting member. It can fall into. Therefore, the peeled developer does not drop to a position away from the gripping magnetic pole and cause image defects due to direct reattachment to the gripping magnetic pole. The gripping magnetic pole can grab a well-stirred developer having a predetermined toner density ratio and obtain a high-quality toner image having a sufficient and uniform image density.
FIG. 1 is a schematic configuration diagram illustrating an image forming unit of an image forming apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram illustrating a developing device according to a first embodiment of the present invention.
FIG. 3 is a schematic explanatory diagram showing a magnetic field in a separation magnetic pole according to the first embodiment of this invention.
FIG. 4 is a schematic configuration diagram illustrating a developing device according to a second embodiment of the present invention.
FIG. 5 is a schematic explanatory view showing a conventional developing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Image formation part 11 ... Photoconductor drum 12 ... Charger 13 ... Laser exposure apparatus 16Y, 16M, 16C ... Developing device 17Y, 17M, 17C ... Developing container 18Y, 18M, 18C ... Developer 20Y, 20M, 20C ... Conveyance Auger 21Y, 21M, 21C ... Mixing auger 22Y, 22M, 22C ... Doctor blade 23Y, 23M, 23C ... Cover 24Y, 24M, 24C ... Peeling auxiliary magnet 36Y, 36M, 36C ... Magnet roller 37Y, 37M, 37C ... Developing sleeve 38Y, 38M, 38C ... Magnetic brush roller

Claims (5)

A developer container having an opening at a position facing the image carrier;
A developing magnetic pole located at the opening of the developing container and facing the image carrier, a conveying magnetic pole located above the developing magnetic pole and carrying developer after passing through the developing magnetic pole into the developing container; A separation magnetic pole for separating the conveyed developer and a gripping magnetic pole located below the separation magnetic pole for gripping the developer in the developer container, and the developer gripped by the gripping magnetic pole at the development magnetic pole A magnetic brush roller for applying an electrostatic latent image on the image carrier;
A peeling auxiliary member that generates a magnetic field in a direction away from the magnetic brush roller when the developer is peeled off from the magnetic brush roller by the peeling magnetic pole and attached to the developer container at a position facing the peeling magnetic pole; A developing device in an image forming apparatus. 2. The image according to claim 1, wherein the peeling auxiliary member is attached to an outer wall of the developing container, and the magnetic field is generated between the peeling magnetic pole and the peeling auxiliary member through the developing container. A developing device in the forming apparatus. 3. The developing device in an image forming apparatus according to claim 1, wherein the peeling assisting member is a magnet, and a magnetism of a surface facing the peeling magnetic pole is opposite to that of the peeling magnetic pole. . 3. The developing device in an image forming apparatus according to claim 1, wherein the peeling assisting member is a magnetic body magnetized by the peeling magnetic pole. An inclined plate is provided between the separation magnetic pole and the gripping magnetic pole, and drops and conveys the developer separated from the magnetic brush roller by the separation magnetic pole in a direction away from the gripping magnetic pole. The developing device in the image forming apparatus according to claim 1.

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