JPS58168065A - Developing device - Google Patents

Abstract

PURPOSE:To enable stable feed of a binary developer to a magnetic brush mechanism even when a developing vessel is large, by combining 2 agitation mechanisms with a developer peeling member having notches. CONSTITUTION:A developer 10 peeled at a developer peeling region R is partly fed through a developer peeling member 34, an agitation mechanism 22, an inclined face 12a (a comparatively long conveyance route) to an agitation mechanism 24. On the other hand, the rest of it is fed to the mechanism 24 through the notches of the member 34, and a guide member 36 (a comparatively short conveyance route). Even if uneven conveyance occurs on the way of the long route, unevenness of the developer 10 fed into a magnetic brush mechanism is reduced by mixing with the developer 10 fed from the short route to the mechanism 24, thus permitting stable feed of the binary developer to the magnetic brush mechanism even if a developer vessel 12 is large.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device that uses a two-component developer consisting of carrier particles and toner particles.

Generally, in electrostatic copying machines, etc., a developing device that uses a so-called two-component developing agent consisting of carrier particles and toner particles is used to convert the electrostatic charge formed on the photoreceptor or waste paper into 111gIIt-IIIigI. It is used. In such a developing device, carrier particles and toner particles are stirred in a current container, and this stirring action charges the toner particles to form an electrostatic latent image through an appropriate means such as a magnetic brush mechanism. It is applied to

However, when the development of the upper Ayu mold (in one plate) takes a long time, in other words, when copying is repeated many times, the performance of the carrier particles in the developer deteriorates. There is a drawback that the toner particles are not sufficiently charged and a good toner relationship corresponding to the electrostatic latent image cannot be obtained. Therefore, for example, when the number of copies exceeds a predetermined number, this deteriorated carrier Particles? Had to be replaced with new carrier particles.

If the volume of the developer container that accommodates the developer consisting of carrier particles and toner particles is small, the amount of developer that can be accommodated therein is small. Since the mixing ratio is kept approximately constant, if the amount of developer that can be accommodated therein is small, the amount of both carrier particles and toner particles will be small).
Due to the amount of carrier particles, the carrier particles deteriorate quickly and their lifespan is shortened, and the carrier particles must be replaced quickly, and due to the amount of toner particles,
As the toner particles are consumed during photocopying, the mixing ratio of the carrier particles and the toner particles varies greatly, making it impossible to obtain a good toner consistency corresponding to the 11 levels of silence.

Therefore, in order to lengthen the exchange interval of carrier particles and reduce fluctuations in the mixing ratio of carrier particles and toner particles, it is possible to increase the volume of the developer container, but it is possible to simply increase the volume of the developer container. In this case, the length of developer transfer from the developer stripping area of the magnetic brush mechanism to the developer pumping area of the magnetic brush mechanism through the stirring mechanism becomes long, and uneven developer feeding occurs during this transfer. As a result, there is a problem in that the developer supplied to the magnetic brush mechanism is unevenly supplied, making it impossible to obtain good toner.

The present invention has been made in view of the above facts, and an object of the present invention is to provide a developing device that uses a two-component developer consisting of carrier particles and toner particles, even if the developing container is enlarged. It is an object of the present invention to provide an improved developing device which can sufficiently stir a developing agent and can stably supply the agitated developer to a brush mechanism.

According to the present invention, there is provided a developer container containing a two-component developer consisting of carrier particles and toner particles;
a magnetic brush mechanism disposed in the sm section; a first stirring mechanism disposed in the is in the current container at a distance t-t from the magnetic brush mechanism; A second stirring mechanism is disposed behind or below the magnetic brush mechanism, and the leading edge is in contact with or close to the surface of the magnetic brush mechanism. The static developer stripping member is provided with a toner particle replenisher for replenishing toner particles into the wrinkling container, and at least a front portion of the static developer stripping member is provided with w4 markings in the width direction. Multiple notches are formed, #magnetic brush mechanism table f
A part of the developer retained in f1K is peeled off from the surface of the magnetic brush mechanism by the action of the vI dust and soda removal member and is made to flow toward the stirring mechanism of the upper te11*1. It is assumed that the remaining part of the developer retained on the surface is moved through the shell notch' without any loss of action of the developer stripping member and is moved towards the second stirring mechanism. A developing device is provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, which illustrate preferred side tones of a developing device constructed in accordance with the present invention.

In FIG. 1 illustrating a developing device constructed in accordance with the present invention, positions i and *i, generally designated by reference numeral 2, are located, for example, in the direction indicated by arrow 9 within the main body of an electrostatic copying machine (not shown). It is arranged at a predetermined position facing the rotary drum 3 which is rotatably mounted.

The rotating drum 3 is of a known type, and includes a substrate 5 made of aluminum and a photoreceptor 7 disposed on at least a portion of the circumferential surface thereof.

It comprises a dust image scissors t2Fi, a developer housing 8 defined by a lower body 4 and an upper cover plate 6. As understood from FIG. 1, this developing housing 8Fi constitutes a developing container 12 that accommodates a two-component developer 10'lj consisting of carrier particles and toner particles. Developing housing 8 part 1! A groove 14 is formed on the surface t1, and an opening 18 is formed at the top of the developing housing 80, into which a toner particle replenisher 16 (described later) is attached. Inside this developing housing 8, a magnetic brush mechanism 2 is provided.
0, the force f of the first stirring rod mechanism 22 and the second stirring mechanism 24!
It is set in '.

The magnetic brush mechanism 20 is composed of a cylindrical sleeve member 28 that is rotationally driven in the direction shown by an arrow 26, and a roll-shaped stationary permanent magnet 30 that is disposed inside the sleeve member 2. , that is, at the front inside the developer container 12 . In the illustrated embodiment, the roll-shaped stationary permanent magnet 30ti has four magnetic poles spaced apart in the chest direction on its periphery, ie, two N poles and two S poles located alternately.

The magnetic brush mechanism 20 attracts the developer present in the developer container 12 in an area P by the action of a magnetic field generated by a stationary permanent magnet 30 along and below the magnetic brush mechanism 20. A portion of the lO is magnetically held on the surface of the sleeve member 28, and rotation of the sleeve member 28 transports the developer 10t held on the surface to the image working area. In the development work area, the developer 10 held on the surface of the sleeve member 28 is passed through the opening 14 formed in the front surface of the developer housing 8 (i.e., the surface IO facing the surface of the rotating drum 30) and held on the surface of the sleeve member 28. The photoreceptor 7 on the rotating drum 3, which is rotated in the direction indicated by 9, is brought into contact with the photosensitive member 7.

Between the developer pumping area P and the developing work area, there is a space DK which is located at a predetermined distance from *w:i of the sleeve member 28 and is held on the surface of the sleeve member 28 to keep dust clean. A spike length setting member 32 for adjusting the amount of the developer 10 to be carried and the thickness of the layer of the developer 10 when the head is changed to an appropriate value.
is installed.

The panicle length setting member 32 has a corner indicated by a reference number 32m located close to the surface of the sleeve member 28 at a predetermined distance 111*, and is formed by the developer lO held on the surface of the sleeve member 28. The length of the magnetic brush is set to a predetermined length. This panicle length setting member 32 has an upper sweetfish interval t
1. For example, in FIG. 1, the developing housing 80 is attached at a required position, more specifically, at the front end of the lower main body 4, so that the mold can be cleaned in the left and right directions in order to clean the mold as needed. .

As seen in the direction of rotation of the sleeve member 28, that is, in the direction indicated by the arrow 26, there is a sleeve downstream of the developing work area (#1 is the opposite side of the developing work area of the sleeve member 28). There is a developer peeling region R where the developer 10 held therein is peeled off from the surface of the member 28. The above-mentioned stationary permanent magnet 30 is not magnetized in the portion corresponding to the developer peeling region R, so it is difficult to determine whether the magnetic field generated by the stationary permanent magnet 30 is sufficiently weak in the dusty and toner peeling region R. or virtually non-existent. Also,
The leading edge of this developer peeling area R is located at the sleeve member 28.
The developer stripping member 34 that is in contact with or close to the surface of
In FIG. 1, a guide member 36 is provided on one side of the developer stripping member 34 between the developer stripping region R and the developer pumping region P. (1it on the left in FIG. 1) #1fPr is provided. In the illustrated example, the developer stripping member 34 and the guide member 36 are integrally formed, but they may also be constructed separately.

As shown in an enlarged view in FIG. 2, the developer stripping member 34 and the guide member 36 have an edge of the developer stripping member 34 and an edge of the guide member 36 connected together,
Several notches 38 are formed at the front edge of the developer stripping member 34. The plurality of notches 38 are substantially rectangular and are formed at substantially equal intervals in the width direction of the developer stripping member 340. Preferably, the notches 38 have substantially the same width t2 and the spacing t5 between the notches.

In the developer stripping area l, in addition to the fact that the magnetic field is sufficiently weak or substantially non-existent, the developer stripping member 340m
As a part of the hoe acts on the developer lO held on the surface of the sleeve member 28, a part of the developer 10 held on the surface of the sleeve member 2B is peeled off from the surface of the sleeve member 280. The upper part of the developer stripping member 34 is made to flow toward the first stirring mechanism 22 (described in detail later), but the remainder of the developer 10 held on the surface of this sleeve member 2B is a salt 9 agent. moves through the notch 38 without being affected by the peeling part @34;
The liquid falls onto the guide member 36 and is caused to flow over the upper surface of the rear guide member 36 toward the second stirring mechanism 24 (described in detail later).

A toner particle replenisher 16 is disposed above the developer stripping member 34 and is attached to an opening 18 formed on the top surface of the developer housing 8 . The toner particle replenisher 16 has a replenisher main body 39'tA, and the replenisher main body 39 has a toner particle replenishment opening 40 formed in its upper part and a toner particle discharge opening 42 formed in its lower part. A lid 43 that closes the toner particle replenishing port 40 is rotatably or removably provided on the top of the toner particle replenisher 16. On the other hand, a toner particle supply roller 44 rotatably attached to the supply device main body 31 is positioned in the toner particle discharge opening 42 . The toner particle supply roller 44 may be a good one having a plurality of grooves or recesses formed on its surface by knurling or the like, or a porous sponge-like roller.

The toner particle supply roller 44 is driven once by an appropriate driving means (not shown) K such as an electric motor mounted on the replenisher main body 39, thereby causing the toner particle replenishment s1.
The toner particles 46 in the developer container 912 are discharged and supplied onto the upper surface of the developer stripping member 34 in the developer container 912 . For example, the thinner particle supply roller 44 is driven to rotate for a predetermined period of time in accordance with the performance of the copier SO, or is driven to rotate for a required period of time in accordance with the consumption amount of toner particles 464D in the present soda container 12, to supply a required amount of toner particles. 46 is supplied into the developer container 12. When toner particles 46 are supplied from the toner particle supply device 16 onto the upper surface of the developer stripping member 34, the toner particles 4
A portion of the toner particles 46 are caused to flow onto the upper surface of the developer stripping member 34 toward the first agitation mechanism 22 (described in detail herein), while the remainder of the toner particles 46 flow onto the upper surface of the developer stripping member 34.
The guide member 36 passes through a plurality of notches 311 formed in the
It falls upward and is caused to flow over the upper surface of the rear guide member 36 toward the second stirring mechanism 24 (described in detail later).

Next, the first stirring mechanism 22 and the second stirring mechanism 24 are separated.

This first stirring mechanism 22, as shown in FIG.
At a distance from the magnetic brush mechanism 20 (in this space, a developer stripping member 34 and a guide member 36 are arranged), the rear part of the developer container 8, that is, the rear part in the developer container 12 ( The magnetic brush mechanism 20 and the developer stripping member 34 are disposed behind the magnetic brush mechanism 20 and the developer stripping member 34.

This first stirring mechanism 22 is of a known configuration per se, and is connected to the arrow 4 in relation to the rotation of the sleeve member 280.
The first stirring mechanism 22, which is rotated in the direction indicated by 8, removes the developer 10 peeled onto the upper surface of the developer peeling member 34 in the developer peeling region R and the developer from the toner particle replenisher 16. The toner particles 46 supplied onto the upper surface of the member 4 are mixed and stirred to uniformly mix the carrier particles and toner particles in the developer 10, and the toner particles are frictionally charged and sent to the second stirring mechanism 24. supply.

On the other hand, the second stirring mechanism 24 is disposed close to and below the magnetic brush mechanism 20 disposed at the front inside the developer container 12 described above. This second stirring mechanism 24 is of a known configuration per se, and the sleeve member 2
80 rotation in the direction shown by arrow 50. The second agitation mechanism 24 is held on the surface of the sleeve member 28, moves through its notch 38' without any action on the active agent stripping member 340, falls onto the guide member 36, and falls onto the rear guide member. The developer 1o1 flowing on the top surface of 36 is discharged from the toner particle replenisher 16 and is removed from the notch 3 without being affected by the developer stripping member 34.
81, fall onto the guide member 36 and flow on the upper surface of the rear guide member 36, and the toner particles 46 and the present 1111i+110 fed by the action of the first stirring mechanism 22 are mixed and stirred. , the carrier II particles and toner particles in the current agent are uniformly mixed, and the toner particles are charged with a magnetic brush mechanism [-
The medicine is pumped up and delivered to area P. 1. ,.

The second stirring mechanism 24 performs the above-mentioned function,
Therefore, this second stirring mechanism 2411t.

It is not necessarily necessary to install 6' below the magnetic brush mechanism 20; It can also be arranged at an appropriate position behind (opposite to the rotating drum 3 with respect to the WB air 12 mechanism 20) or below.

As shown in FIG. It is preferable to configure That is, the magnetic brush machine $20 has a developer pumping area P formed below it, and the bottom surface of the first container 12 is located at the front (left side in FIG. 1) and the rear (left side in FIG. The second stirrer @ 24 is disposed below the magnetic brush mechanism 20 and is tilted upward toward the right side in FIG. It is preferable that a spike length setting member 32 is disposed at a predetermined interval above the magnetic brush mechanism 200 table (3) below with respect to the rotational direction of the magnetic brush mechanism 28 (FI@). By having the above structure, the dust bond lO that is caused to flow from the first stirring mechanism 22 toward the second stirring mechanism 24 is directed downwardly on the upper surface of the inclined surface 12& of the bottom surface of the developer container 12. The surplus developer 10 which is caused to flow toward the direction and which is regulated by the spike length setting member 32 is peeled off from the surface of the sleeve member 28 and flows downward on the top surface of the bottom surface of the developer container 12, which has an inclination 1] 12b. As a result, the developer 10 does not accumulate on the bottom surface of the developer container 12, and the developer is stably flowed toward the second stirring mechanism 24. As a result, the developer 10 from the first stirring mechanism 22 and the developer 1 peeled off by the spike length setting member 32 can be made to flow.
0 and the developer lO flowing onto the upper surface of the guide member 36 can be stirred and mixed in the second stirring mechanism 24 and supplied to the magnetic brush mechanism 20 located above.

Next, 20 functions and effects of the developing device as described above will be explained. The developing device F2 performs the next threading operation in accordance with the rotation of the sleeve member 28 in the direction shown by the arrow 26.

First, the developer 10 stirred and fed by the second stirring mechanism 24 is drawn into the sleeve member 280 by the magnetic attraction force of the stationary permanent magnet 30 in the region P.
The surface of the sleeve member 28 is suctioned and held, and the sleeve member 28 is held by suction.
A liliKWi brush is formed. Such magnetic brushes are then inserted into the sleeve member 28C) at a distance t1! ! Due to the action of the panicle length setting member 320 located close to the surface,
The II length is made to be a predetermined length, and the surplus developer 1o is removed from the slope EIi12b of the bottom surface of the developer container 12.
The liquid is caused to flow toward the second stirring mechanism 24 over the upper surface of the liquid.

Thereafter, in the developing work area, the magnetic brush is brought into contact with the surface of the photoreceptor 70 of the rotating drum 3, which is being rotated in the direction shown by the arrow 9, and is blown to form the image on the photoreceptor 7. The toner particles in the magnetic brush are applied to the electrostatic latent tube, and the electrostatic latent bone is visually developed.

After such a development action, in the developer stripping region R, in addition to the fact that the magnetic field is sufficiently weak or substantially non-existent, the magnetic field on both edges of the developer stripping member 34 is By acting on the developer, a portion of which is held on the surface of the sleeve member 280, a portion of the developer 10 that is held on the surface of the sleeve member 28 is peeled off from the surface of the sleeve member 28, and the developer stripping member 34 top surface first
However, the remaining part of the developer 10 held on the surface of the sleeve member 28 moves through the notch 381 without being affected by the developer stripping member 340, and moves toward the guide member 22. 36 and is caused to flow on the upper surface of the rear guide member 36 toward the second stirrer #I24. Next, the developer 1° that is made to flow on the upper surface of the developer peeling member 341fD is transferred to the first stirrer $1.
22, this first
By the action of the stirring mechanism 220, the liquid is caused to flow on the inclined 1+12io upper surface of the first surface of the developer container 124DJ toward the second stirring mechanism 24. Further, the developer 10 flowing on the upper surface of the guide member 36 is moved 1 m above the upper surface of the inclined surface 12m of the bottom surface of the developer container 12 in the second stirring mechanism 24.
Bottom surface C) of the moving developer 10 and developer container 12
The developer is stirred and mixed with the developer 10 flowing on the upper surface of the Ijl#ffi 12 b, charged, and then fed to the developer draw-up area P of the magnetic brush mechanism 20.

As described above, part of the developer 10 peeled off in the developer peeling region R is on the top (3) of the developer I#Jl111 member 34, on the first stirring mechanism 22, and on the #l slope of the bottom surface. 12
1 to the second agitator 1124 (constituting a relatively long developer lO feeding meridian), while the remainder is fed to the plurality of notches 38 of the developer stripping member 34 and the guide member 36. Since the developer is fed to the second stirring element 24 (forming a relatively short feeding path of the developer 10) through the upper surface, the developer is Even if a feeding unevenness of 10 occurs, the developer 1 is delivered to the second stirring mechanism 24 through a relatively short developer lO feeding path pipe.
0 is fed, and therefore the developer 10 fed to the second stirring mechanism 24, in other words, the developer 10 fed to the developer pumping area P of the magnetic brush@I mechanism 20, is unevenly fed. As a result, the dust removal effect of the magnetic brush mechanism 20 can be made more uniform.

On the other hand, for example, when the toner particle supply roller 44 is rotated for a predetermined period of time during a copying process, the toner particles 46 in the toner particle supply device 16 are transferred onto the upper surface of the developer stripping member 34 in the developer container 12. be discharged. When these toner particles are discharged in this manner, some of the toner particles are deposited on the upper surface of the developer stripping member 34, on the first stirring mechanism 22, and on the slope 1f112a of the bottom surface.
i (constitutes a relatively long developer 10 feeding path)
The remaining toner particles 46 are fed to the second agitation mechanism 24 , while the remaining toner particles 46 are fed to the second stirring mechanism 24 through several notches 3 of the developer stripping member 34 .
8. Passing over the upper surface of the guide member 36 (relatively short developer 1
00 feeding route (constituting) is fed to the second stirring mechanism 24. Thus, upon completion of the development operation, toner particles are consumed and distributed to the developer 10 in the relatively long developer 1o feeding path and the developer 10 in the relatively short developer 10 feeding path, respectively. New toner particles 46 are glued,
Therefore, the developer in this relatively long feeding path is 1° (
It is possible to make the mixing ratio of carrier particles and toner particles approximately the same as the mixing ratio of developer 10 (carrier particles and toner particles) in a relatively short feeding path, and even in a relatively long feeding path. Even if uneven feeding of the developer 10 occurs, the developer 1 is fed to the second stirring mechanism 24, in other words, the developer 1 is fed to the equalizing agent pumping area P of the magnetic brush mechanism 20.
The mixing ratio of 0 (carrier particles and toner particles) can be made approximately equal.

Although the developing device constructed according to the present invention has been described above in detail based on the preferred specific examples illustrated in the accompanying drawings, the present invention is not limited to such specific examples, and may deviate from the scope of misfire@6. Various modifications and modifications can be made without any problems.

For example, in the specific example shown in the accompanying drawings, a rectangular notch is formed at the front edge of the developer stripping member, but instead of this rectangular notch, an appropriate semicircular, triangular, or reciprocal shape can be used. A shaped notch may be formed, in which case,
Preferably, the distance between the widths of the notches themselves at the leading edge of the developer stripping member that contacts or approaches the sleeve member is substantially the same as the distance between the notches at this leading edge.

Further, in the specific example illustrated in the accompanying drawings, a guide member is provided to guide the developer that is peeled off from the surface of the sleeve member through the plurality of notches of the developer peeling member to the second stirring mechanism. However, this guide member is not necessarily necessary and can be omitted if the developer is reliably fed to the second stirring mechanism.

Furthermore, in the specific example illustrated on the first page of the attachment, an electrostatic latent image corresponding to the original document is formed on a suitable photoreceptor using a processing device constructed according to the present invention, and then this electrostatic latent image is Pjrllll makes it into an image and then transfers it to the photographic paper.
Although the description has been made by applying the Wt copy laying method using the image transfer method, there are other methods that are known per se. An electrostatic latent image transfer method in which the electrostatic latent image on the copy paper is transferred to a photocopy paper, and then the electrostatic latent image on the copy paper is visualized. The present invention can also be applied to a direct-type static W copying machine that forms an electrostatic latent image and then converts this electrostatic latent image into an image.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view illustrating a preferred embodiment of a presentation device constructed in accordance with the present invention. FIG. 2 is a perspective view showing the developer stripping area of the magnetic brush mechanism of the developing device shown in FIG. 1. 2...Developing device 3...Rotating drum 10...Developer 12...Developing container 16...Toner particle replenisher 20...Magnetic brush mechanism 22...First stirring mechanism 24. ...Second stirring mechanism 28...Sleeve member 3o...Stationary permanent magnet 34...Developer stripping member 38...Notch Patent applicant Sanda Kogyo Co., Ltd. Continued from page 1 0 Inventor Masahiro Watashi, 1-2-28 Tamatsukuri, Higashi-ku, Osaka, Sanda Kogyo Co., Ltd., 0 Author: Kiyonori Yamamoto, 1-2-28 Tamatsukuri, Higashi-ku, Osaka, Sanda Kogyo Co., Ltd., Author: Toshihiko Yamamoto, Tamatsukuri, Higashi-ku, Osaka 1-2-28, Sanda Kogyo Co., Ltd. 0 Inventors: Shinsuke Yoshinaga, 1-2-28 Tamatsukuri, Higashi-ku, Osaka, Sanda Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A developer container containing a two-component developer consisting of carrier particles and toner particles, a magnetic brush mechanism disposed at the front of the developer container, and a magnetic brush mechanism. a first agitation mechanism disposed at the rear of the developing container with an interval t between the two; a second agitation mechanism disposed close to and behind or below the nuclear magnetic brush mechanism; a developer stripping member disposed between the brush mechanism and the first stirring mechanism, the front # of which is located in contact with or close to the surface of the magnetic brush mechanism; and a developer stripping member for replenishing the developer container with a toner particle tube. a toner particle replenisher; a plurality of notches are formed in at least the front part of the developer stripping member at intervals of VC in the width direction; A part of the **** agent is removed by the action of the developer stripping member.
i[I11 The developer is peeled off from the surface of the magnetic brush mechanism and made to flow on the upper surface toward the first stirring mechanism, but the remainder of the developer retained on the surface of the magnetic brush mechanism remains in the developer stripping member. 2. A current device, characterized in that the current device moves through the notch and is caused to flow towards the second stirring mechanism without being affected by the above. 2. #The notch t below the developer peeling member! Claim 1: A guide member is provided for directing the developer moving through the tube toward the second stirring mechanism.
Developing device as described in section. 3. Claim V in which the trailing edge of the skeleton developer stripping member and the edge of the scissor guide member are integrally connected! A. Current Il device according to paragraph 2. 4. A patent claim in which the skeleton notches are substantially rectangular and are formed at substantially narrow intervals in the width direction, and the width of the notches themselves is the same as the distance between the notches. The developing device according to any one of items 1 to 3. 5. The toner particle replenisher supplies toner particles toward the upper surface of the developer stripping member, and a portion of the supplied toner particles is directed toward the upper surface of the developer stripping member toward the first stirring mechanism. The developing device according to any one of claims 1 to 4, wherein the remaining toner particles that have been replenished move through the beam notch and flow toward the second stirring mechanism. . 6. The magnetic brush mechanism includes a sleeve member that is rotatably sawed (1) and a stationary permanent magnet disposed in the sleeve member, and the developer is applied to the surface of the sleeve member by the action of a magnetic field generated by the stationary permanent magnet. #) The magnetic field generated by the stationary permanent magnet L1 is sufficient in the developer stripping area where the leading edge of the developer stripping member contacts or approaches the surface of the skeleton sleeve member. The developing device according to any one of claims 1 to 5, which is weak or substantially non-existent. 7. The magnetic brush mechanism magnetically attracts and retains the developer in the developer pumping area located below the magnetic brush mechanism, and the bottom surface of the developer container extends forward and downward from the developer pumping mound. the second stirring mechanism is arranged below the magnetic brush mechanism;
Further, downstream of the first pumping area of the Rukai Qi 1, the first koji is placed at a predetermined distance from the surface of the magnetic brush mechanism, and the current area is held on the surface of the magnetic brush mechanism. 7. The developing device according to any one of claims 1 to 6, further comprising a spike length setting member for regulating the amount of developer conveyed to the developing device.