JPS6095572A - Dry type developing device - Google Patents

Abstract

PURPOSE:To develop a latent image on the surface of a latent image holder sharply with good resolution, and prevent a developer from blocking and fusing and magnetic particles from leaking by arranging a magnetic particle restraining member slantingly to the downstream side in the moving direction of the developer holding member, and falling magnetic particles along the magnetic particle restraining member. CONSTITUTION:Magnetic particles 20 are fallen and charged to form a magnetic particle magnetic attracting layer in a surface area of a developing sleeve 12 at the inward side of a container, and then the bottom plate 29 of the 3rd chamber 27 is drawn out and removed. Then, the nonmagnetic developer 24 in the 3rd chamber 27 falls and is charged in the 1st chamber 25. The magnetic particle attracting layer part between a magnetic pole 17 and the front end part of the magnetic blade 23 as the magnetic particle restraining member is restrained at a position 19 on the surface of the sleeve 12 where constraint force based upon the effect by gravitational force and magnetic force and the presence of a magnetic blade 23 is balanced with the movement-directional conveying force of the sleeve 12 even when the sleeve 12 is driven as shown by an arrow (b) to rotate, thereby forming a still layer 20b which is slightly movable, but almost fixed.

Description

[Detailed Description of the Invention] The present invention provides a technique for forming a latent image on the surface of a photoreceptor, dielectric, magnetic material, etc. using a conventionally known process using appropriate principles such as electrophotography, electrostatic recording, magnetic recording, etc. This invention relates to a phenomenon device that visualizes electrical latent images such as electrostatic latent images and magnetic latent images using dry developer (toner).

More specifically, the dry developer is formed and held as a thin layer on the surface of the developer holding member, and the oil phase is developed by facing the latent image holding member with a small gap 17 between the layer forming and holding surface. A method of developing a latent image by selectively shifting and depositing a thin developer layer of developer according to the latent image pattern on the latent image carrier side by the action of a bias (jumping method);
``This invention relates to a developing device of a type (contact type) in which a thin layer of developer on the surface of the developer holding portion AA is brought into contact with the surface of the image carrier to develop a latent image.

As described above, a developing device in which the developer is formed and retained as a thin layer on the surface of the developer holding member and applied to the surface of the latent image holding member uses a magnetic developer as the developer. There have been various proposals for applying Iu to the surface of a latent image carrier by forming and maintaining a thin layer of uniform thickness in each part using a magnetic field and a layer thickness regulating step (for example, JP-A-54-43017
q publication, etc.), and has also been put into practical use.

By the way, in this type of developing device (a), in order to make the P+ developer magnetic, it is necessary to add a magnetic substance to the developer, and this internally added magnetism (a) The fixation +'l is poor when thermally fixing the developed image transferred to the image.

Furthermore, since the magnetic material is usually black, it is difficult to obtain a brightly colored toner, and there are problems such as poor color reproducibility in color copying.

Therefore, a non-magnetic ('l) developer is used as the developer, and the method of forming a thin layer of the non-magnetic developer is to use a cylindrical brush made of soft hair like beaver's hair, and apply the developer to it. A method has been proposed in which the coating is applied to a developing roller whose surface is made of fibers such as velvet using a doctor blade or the like.

However, if an elastic blade is used as a doctor blade for the MV II brush described in 1-1, it is possible to regulate the amount of developer, but uniform application is not achieved, and fibers M [just rubbing the brush] are not applied to the developing roller. However, since no triboelectric charge is imparted to the phenomenon agent existing between the fibers of the brush, there is a problem in that ghosts and the like are likely to occur.

The present invention was developed and proposed in view of the above, and uses a non-magnetic developer as a developer, and uses a novel thin layer forming method to form a uniform and thin layer on each part of the developer holding member surface. Developed images with good sharpness, resolution, and fixing properties, and good color reproduction in color copies. Or, the purpose is to provide a developing device that can always stably obtain copied images,
The gist of the present invention is the developing device configuration described in the claims.

EMBODIMENT OF THE INVENTION A detailed description will be given below based on an embodiment of the present invention shown in the drawings. FIG. 1 is a cross-sectional side view before magnetic particles and non-magnetic developer are introduced into the developer supply container, and FIG. 2 is a cross-sectional side view of the main parts after the magnetic particles and non-magnetic developer are introduced into the developer supply container. In the figure, 14 is a developer supply container, and 12 is a developing sleeve as a developer holding member.

The developing sleeve 12 is, for example, a non-magnetic sleeve made of aluminum or the like, and the right half circumferential surface of the developing sleeve 12 is inserted into a horizontally long opening formed in the lower part of the left side wall of the developer supply VV device 14 in the longitudinal direction of the container.
4, it is placed horizontally with approximately half the left circumferential surface exposed outside the container and is freely rotatable on a bearing, counterclockwise as indicated by the arrow l.
) is rotationally driven. The developer holding member 12 is not limited to a cylindrical body (sleeve), but can also be an endless belt type I that is rotatably driven.
It may be set to E, etc. The developing sleeve! The externally exposed surface of the container No. 2 faces the surface of the latent image carrier 11, such as a photoreceptor, which is driven to move in the direction of arrow a, with a small gap therebetween.

Reference numeral 13 denotes a fixed permanent magnet (magnet I) inserted into the developing sleeve 12 and held in the position and orientation shown in the figure as a first stage of fixed magnetic field generation. 13 is maintained in the position struggle position shown in the figure. This magnet 13 has a north pole 17 and a south pole 18
has magnetic poles.

The magnet 13 may be an electromagnet instead of a permanent magnet.

The reference numeral 23 is attached to the upper edge of the opening of the developer supply container in which the developing sleeve 12 is disposed, the base is fixed to the side wall of the container, and the tip end is opened by protruding into the container 14 from the upper edge of the opening. This is a magnetic blade as a magnetic particle restraining member disposed along the line, for example, made by bending an iron plate into a crosswise simplified shape.

FIG. 3 is a diagram showing the attitude and angle relationship of the magnetic blade 23 with respect to the developing sleeve 12. 19 is a point on the sleeve defined between the downstream side of the magnetic pole 12 in the rotational direction of the sleeve and the upper edge position of the opening of the container where the sleeve 12 is installed in the rotational direction of the sleeve. , n is the normal to the sleeve 12 at the point 19. The magnetic blade 23 has its distal end located at a point 19 with respect to the sleeve 12 with a gap d between the surface of the sleeve 12 and the normal n of the sleeve 12 at the point 19.
The blade is disposed toward the downstream side in the direction of movement of the sleeve, with an angle δ formed between the sleeve and the center edge of the blade. θ is the angle between the vertical line m passing through the rotation center of the sleeve 12 and the normal line n, P is the line connecting the rotation center of the sleeve 12 and the center of the magnetic pole 17, and π is the angle between the iP and the superposition 111j In. The nozzle angle is 1 (position angle of the magnetic pole 17).

1) 1f gap distance d between the tip of the magnetic blade 23 and the surface of the developing sleeve 12 at point 19 is 100 to 1
000 IL, preferably 200-500u, and in this example 300 IL. This interval d is 10011
．． If the size is smaller, the magnetic particles described below will be smaller than E1. There is a drawback that the blade gets stuck and is pushed out to the outside of the blade. J: 1000
If it is larger than μ, -11i rdi +
I1.1/, statue? 'llll 1 + 1 2 leaks out, making it impossible to form a thin layer.

The bottom JJj of the developer supply container 14 is the development front 1/V section A4.
It extends below the developing sleeve 12 to prevent the developer from leaking to the outside. In addition, in order to further ensure the prevention of leakage of the developer to the outside (11-), the base is fixed to the tip edge of the extended bottom plate along the edge pure bristles, and the tip edge is lightly brought into contact with the underside of the developing sleeve I2 for sealing. An oil phase 21 is provided, and the gap 1-1 between the tip edge of the bottom plate extension 141) and the lower surface of the sleeve 12 is closed by the seal member 21.

It is divided into three chambers: a first chamber 25 in the lower half that includes the blade 12 and the magnetic blade 23, a second chamber 26 and a third chamber 27, which are further divided into two left and right chambers. It is. Second
The chamber 26 is located on the -L side of the magnetic blade 23 and has a smaller volume than the third chamber 27. The developing device is shipped by the manufacturer with the magnetic particles 20 stored in the second chamber 26 and the non-magnetic developer 24 stored in the third chamber 27, with the first chamber 25 left empty.

Each bottom plate 28 and 29 of the second chamber 26 and the third chamber 27 is connected to the container 1.
A knob portion is exposed on the outside of the front end plate of No. 4, and by grasping the knob portion and pulling it toward the front side, the bottom plate 28 and 29 can be pulled out of the container and removed. When the respective drawing and removal operations are performed, the magnetic particles 20 in the second chamber 26 and the non-magnetic developer 24 in the third chamber 27 are respectively dropped into the first chamber 25.

The magnetic particles 20 accommodated in the second chamber 26 have a particle size of 3° to 1
20 g, preferably 70-150 g. Each magnetic particle may be made of only a magnetic material, a combination of a magnetic material and a non-magnetic material, or a mixture of two or more types of magnetic particles. Also, only the magnetic particles may be accommodated, but
Must include JllSIIil magnetic particles and about 2 to 70
% (weight M) of non-magnetic developer.

The non-magnetic developer contained in the third chamber 27 may be the developer alone, or may be mixed with small magnetic particles. In addition, silica particles may be added to improve fluidity, or abrasive particles may be added to polish the surface of the latent image carrier 1 or photoreceptor in a transfer image forming apparatus, for example.

When the user starts using the developing device, the bottom plate 28 of the second chamber 26 is first pulled out and removed. Then, all of the magnetic particles 20 housed in the i2 chamber 2G fall onto the two surfaces of the magnetic blade 23, and then flow down to the tip side of the blade due to the inclination of the blade, and further to the inside of the container of the developing sleeve 12. It flows down toward the bottom plate of the container along approximately half the circumferential surface of the container. Developing sleeve 1 of this magnetic particle
In the process of flowing down along the two surfaces, most of the magnetic particles are transferred to the developing sleeve surface area, that is, from the tip of the magnetic blade 23 to the lower edge 14a of the container opening where the sleeve 12 is disposed, due to the magnet 13 in the sleeve. It is attracted and held by a magnetic field as a magnetic adsorption layer. In other words, each part of the sleeve surface area is covered with the magnetic adsorption layer of the magnetic particles. Once the magnetic particles are adsorbed and held on the sleeve surface area as a magnetic adsorption layer, they will not substantially shift to one side even if the device is vibrated or the device is tilted considerably, and the magnetic particles will cover the entire sleeve surface area. State is preserved.

The magnetic particles dropped onto the magnetic blade 23 from the second chamber 26 may not flow down smoothly to the blade tip side due to the slope of the magnetic blade being gentle or the fluidity of the magnetic particles. In some cases, a steep slope member 30 may be disposed below the bottom plate 28 of the second chamber 26 and along the length of the blade between the inner surface of the left side wall 14c of the container and the upper surface of the magnetic blade 23, as shown in the example in FIG. In addition, in order to ensure that the entire sleeve surface area is covered with a magnetic adsorption layer of magnetic particles by causing the magnetic particles to flow down approximately evenly from each longitudinal portion of the blade tip onto the developing sleeve surface, as shown in FIG. As shown in FIG.
)-IJ (Part 4: 4' 30 (7) Part,!!1'
In the case where magnetic particle flow down direction is not required, it is preferable to form magnetic particle flow guide/distribution fin-like protrusions 31 arranged in a radial n1 shape and spread toward each other on the distal side of the blade which is cut in the direction of the magnetic particle flow downward direction.

As described above, first, the magnetic particles 20 are dropped 1α to form a magnetic particle magnetic adsorption layer on the surface area of the inner side of the container of the developing sleeve 12, and then the bottom plate 27 of the i7's3 chamber 27 is
Pull out and remove. Then, the non-magnetic developer 24 in the third chamber 27 is dropped into the first chamber 25, and a large amount of it is deposited on the outside of the magnetic particle magnetic adsorption layer for the sleeve 12 formed in the L light distribution as shown in the second figure. Reservoir shape m (becomes.

When the magnetic particles 20 and the non-magnetic developer 24 are sequentially charged and housed in the first chamber 25 of the developer supply container 14 in this way, the sleeve surface ζ 1 corresponding to the position of the magnetic pole 17 of the magnet 13 is placed near The strong magnetic field of the magnetic pole 17 creates a magnetic brush 20 of magnetic particles in the magnetic adsorption layer.
a is formed.

Furthermore, even when the sleeve 12 is rotated in the direction indicated by the arrow, the magnetic particle magnetic adsorption layer between the magnetic pole 17 and the tip of the magnetic blade 23 serving as a magnetic particle restraining member is based on the effects of gravity, magnetic force, and the presence of the magnetic blade 23. Due to the balance between the restraining force and the conveying force in the moving direction of the sleeve 12,
The layer 20b is restrained at the point 19 on the surface of the layer 2, forming a stationary layer 20b that can move to some extent but is almost immobile.

Also, when the sleeve 12 is rotated in the direction shown by the arrow, the magnetic pole 17
By appropriately selecting the arrangement position and the fluidity and magnetic properties of the magnetic particles 20, the magnetic brush 20a circulates in the direction of arrow C near the magnetic pole 17, forming a circulation layer 20c.

In other words, in the circulation layer 20C, the magnetic brush 20a of magnetic particles is circulated as shown by arrow C due to the magnetic force and frictional force due to gravity and magnetic poles, and the wave nature (viscosity) of the magnetic particles, and during this circulation, the magnetic brush 20a is made of magnetic particles. 1fg of non-magnetic developer 24 is sequentially loaded from the image-side layer at the top of the particle layer and returned to part f in the developer supply container 14, and this circulation is repeated l/i as the sleeve 12 is rotated. figure. magnetic blade 23
is not directly involved in this cycle.

The non-magnetic developer that is sequentially taken in and mixed into the magnetic particle magnetic adsorption layer on the sleeve 12 surface is driven by the magnetic particles and causes friction with the magnetic particles, friction between the non-magnetic developer particles, friction with the surface of the developing sleeve, etc. 41) Power up. In this case, it is preferable to apply an insulating treatment such as an oxide film or 4#III-r which is electrostatically at the polarization level to the non-magnetic developer on the surface of the magnetic particles to reduce the triboelectric ratio Ij from the magnetic particles and By allowing the developing sleeve 12 to receive the electrification, it is possible to prevent the influence of deterioration of the magnetic particles and to stabilize the application of the developer to the developing sleeve 12. Since the charged developer is non-magnetic, it is fluxed by the magnetic field of the magnetic pole 17.
While rotating from the magnetic blade 23 to the tip of the magnetic blade 23,
Due to the mirroring force, each part of the sleeve surface is coated uniformly and thinly.

And the magnetic particle surface F near the tip of the magnetic blade 23
Even when the sleeve 12 is rotating, the magnetic particles in the layer 20b are restrained by the balance between the restraining force based on gravity, magnetic force, and the effect of the presence of the magnetic blade 23, and the conveying force in the moving direction of the sleeve 12, as described above. and does not pass through the gap d between the tip of the magnetic blade 23 and the sleeve 12,
Only the thin coating layer of the non-magnetic developer formed on the surface of the sleeve 12 forms the gap d as the sleeve 12 rotates.
It passes through and rotates toward the latent image carrier ll side, and approaches and faces the surface of the latent image carrier. Reference numeral 24a indicates a thin coating layer of non-magnetic developer formed on the surface of the developing sleeve 12. Further, the area where the developing sleeve 12 and the latent image holder 11, on which the thin layer of non-magnetic developer is formed, approaches each other is referred to as a developing area A.

In the developing section A, the non-magnetic developer layer 24a on the side of the developing sleeve 12 is heated by the electric field of the developing bias applied between the latent image holding body 11 and the developing sleeve 12 by the bias power supply 25. The latent images are selectively transferred and adhered to the latent image pattern 24b, and the latent images are sequentially developed (for this developing section V, see, for example, Japanese Patent Publication No. Sho Fin-32175+IJ). The bias power source 25 may be an alternating current or a direct current, but it is preferably one in which alternating current and direct current are superimposed.

The surface of the developing sleeve that has passed through the developing section A and has been consumed by selective development of the developer layer is returned to the developer supply container 14 by the continuous rotational drive of the sleeve, where it is once again formed into a magnetic particle magnetic adsorption layer. The cycle of touching the surface and being coated with the non-magnetic developer contained within the layer is repeated.
Development of the surface of the latent image holder 11 is performed continuously. As described above, the magnetic particle magnetic adsorption layer is provided with the magnetic particle circulation layer 20.
C, the developer is sequentially taken in from the storage layer of non-magnetic developer 24 existing outside of the non-magnetic developer 24, and is naturally replenished. In addition, in order to prevent the so-called ghost image phenomenon of the developing sleeve, the container 1
The developer layer that has not been subjected to development is scraped off from the rotating developing sleeve surface by a -H scraper means (not shown), and the developer layer scraped off sleeve surface is brought into contact with the magnetic particle magnetic adsorption layer. It is also a good idea to have the developer coated on the surface.

The supply of the magnetic particles 20 and the non-magnetic developer 24 into the developer supply container 14 is not limited to the two-stage supply as described above. A substantially uniform mixture of magnetic particles and non-magnetic developer for the entire amount of the developer layer 24 is supplied in advance, and then the developer supply container 14 is vibrated or the developer holding member 12 is preliminarily moved. It may be rotated to separate and form two layers, a magnetic adsorption layer of magnetic particles on the sleeve surface and a non-magnetic developer layer 24 outside thereof, due to the difference in specific gravity between the magnetic particles and the non-magnetic developer and the magnetic field of the magnet 13.

Even if a substantially uniform mixture of magnetic particles and non-magnetic developer is supplied in advance, it is still possible to carry out the process as long as the amount of magnetic particles is sufficient to form a magnetic adsorption layer on the sleeve surface. be. However, in order to maintain long-term stability of the magnetic particle magnetic adsorption layer, it is preferable to first supply the magnetic particles 20 and then a non-magnetic developer into the container 14 to form the above two layers.

In the case of a two-layer structure, the magnetic particle layer consisting of the static layer 1 and the circulation layer is formed near the outer surface of the developer holding member 12 from the beginning, and the developer layer 24 does not contain any magnetic particles. Because the magnetic particles are small in number, the state of the magnetic particle layer remains almost constant and does not change even if the operation continues for a long time. It is a part of the developing device rather than a separate section.

In the example device shown in FIG. 1-2, the developer holding member 12 is φ.
A No. 20 aluminum sleeve whose surface was subjected to irregular sandblasting with 7 random abrasive grains was used. Incidentally, the blasting may be performed by roughening the surface by regular blasting using glass beads, etching, extrusion processing, sandpaper, anodic oxidation, or the like.

As the magnetic field generating means 13, a permanent magnet with two poles magnetized and having an N pole and an S pole as shown in FIG.
Figure 2) was used at 80°. The maximum value of the surface magnetic flux density of the magnet 13 is about 500 Gauss. In addition, it is preferable to further increase this strength in the case of the developer used, especially a developer with slightly poor fluidity. Visual observation shows that for a magnet with a surface magnetic flux density of approximately 800 Gauss, the first Uf4c
The magnetic particle circulation in the direction was approximately doubled.

The magnetic blade 23 is made of an iron plate with a thickness of 1.2 mm and chemically nickel plated. SPC steel plates, silicon steel plates, permalloy, etc., which are commonly used industrially, are desirable as materials for iron plates.Also, these magnetic materials may be magnetized to strengthen the magnetic field in the tangential direction.In Fig. 2, θ = 35°, δ=85°,
It was used for d = 250. δ = 80°, that is, in the tangential direction of the sleeve, but if the mechanical precision is poor, the magnetic blade 23 may hit the sleeve 12, and δ>
This tendency is even more pronounced at 80°, which is not preferable in terms of restraining the magnetic particles.

Furthermore, a polyethylene terephthalate sheet (thickness: 0.21 m) was attached as a sealing part it 2 t as shown in FIG. Further, instead of the seal member 21, a magnetic seal made of a magnetic material may be used in order to prevent leakage of magnetic particles due to the magnetic field between the seal member 21 and the magnetic pole 18.

1% of particles as magnetic particles 20 1011~80 jL (
+50/200 mesh) iron particles (maximum magnetization 101
00e/g), and as a non-magnetic developer 24, 0.0% colloidal silica was added to a toner powder with an average particle size of 10 JL consisting of 100 parts of a styrene/butane diene copolymer resin and 5 parts of the same phthalocyanine pigment. I used blue toner.

When the developing sleeve 12 was rotated in the direction indicated by the arrow, a coating thickness of approximately 50 to 50 mm was formed on the sleeve 121-.
Thin coating layer of non-magnetic developer with a good tribocharge of the toner on the sleeve of +00 p, m, measured by the blow-off method -++01 tc/g 24. A was obtained.

This developing device was also incorporated into a Canon Co., Ltd. V pc-to type copying machine, and a frequency of 18 was installed as a bias voltage lI25.
Using a peak-to-peak image of 300V AC voltage and -300V DC voltage superimposed at 00Hz, the spacing between sleeve 12 and OPC photoreceptor 11 (7) was set to 25011.
．． When development was performed with the setting at m, a bright blue image with good clarity and resolution was obtained.

Although the non-magnetic developer 24 is used in this example, it has significantly weaker magnetism than the magnetic particles 20, and a magnetic developer can also be used as long as it can be tripo-charged. Furthermore, depending on the magnetic properties of the magnetic particles, the magnetic particle stationary layer 20b may not reach the blade 23 position, creating a portion where no magnetic particles exist between the stationary layer 20b and the blade 23. Toner may leak. For this reason, it is desirable that the magnetic particles form a sufficiently long brush.

By the way, regarding the magnetic particles 20, they are put into the developer supply container 14 and the developing sleeve 12, which is a developer holding member, is placed inside the developer supply container 14.
To form and hold the magnetic particles as a magnetic adsorption layer on the inner surface area of the container, the magnetic particles are supplied approximately evenly to each part of the sleeve surface area, and the entire sleeve surface area is covered with the magnetic particle magnetic adsorption layer. It is important to keep it in the same position.

0 In other words, the supply of magnetic particles to the sleeve 12 is uneven, and there is a dew 111 surface without a magnetic adsorption layer of magnetic particles on a part of the sleeve surface area, or along the tip side of the magnetic blade 23 which is a magnetic particle restraining member. If there is a part of the gap between the tip of the blade 23 and the sleeve surface that is not covered with magnetic particles due to the absence of magnetic particles, the sleeve 12
The thin layer of non-magnetic developer on the surface may be uneven or not covered with magnetic particles. Non-magnetic developer may leak out of the container from the gap between the tip of the blade and the sleeve. This may result in scattering, etc.

In this regard, in the present invention, the magnetic particle restraining member (blade 2
3) is arranged so as to be tilted toward the downstream side in the moving direction of the developer holding section 4A (sleeve 12), and the magnetic particles 20 are allowed to fall along the magnetic particle restraining member, and the developer holding part 20 is caused to fall from the tip of the magnetic particle restraining member. Since the magnetic particles are supplied to the upstream side in the direction of movement of the member, the magnetic particles are supplied approximately evenly to each longitudinal portion of the required surface of the developer holding member, and the entire required surface area of the developer holding member is uniformly magnetic. The particles can be covered with a magnetic adsorption layer.

Thus, according to the developing device of the present invention, it is possible to form a stable coating over a long period of time with a non-magnetic developer as a uniform thin layer having a sufficient amount of charge on each part of the surface of the developer holding member. Therefore, this thin developer layer allows the latent image on the surface of the latent image carrier to be developed clearly and with good resolution.

In addition, magnetic developers can produce vivid colors, making it possible to produce high-quality color copies (single-color, single-color, etc.) with excellent color reproducibility.
Multicolor, natural color) can be obtained.

In addition, in the present invention, since the magnetic particle restraining member is tilted toward the downstream side in the moving direction of the developer holding member, the magnetic field in the tangential direction can be stronger than the magnetic field in the normal direction on the developer holding member, and the magnetic particle restraining member can be It can prevent blocking of developer in the member, fusion of developer, leakage of magnetic particles, etc. Therefore, a pressure fixing toner can also be used as the developer.

[Brief explanation of the drawing]

The drawings show an apparatus according to an embodiment of the present invention.
The figure shows the time after loading, FIG. 3 is an explanatory diagram of the arrangement position φ angle relationship of the magnetic blade with respect to the developing sleeve, and FIG. 5 is a side view of an example in which a fin-like protrusion is further provided on the surface of the steep surface member. 11 is a latent image holding member, and 12 is a developing member. 13 is a magnetic field generating means (magnet), 14 is a developer supply container, 23 is a magnetic particle restraining portion, 20 is a magnetic particle, and 24 is a non-magnetic developer. 3 JP-A-Sho GO-95572 (8) )

Claims (1)

[Scope of Claims] A developer supply container having an opening near the bottom; a developer holding member provided in the opening and movable endlessly inside and outside the container; and a developer holding member provided inside the developer holding member. a fixed magnetic field generating means; and a magnetic particle restraining member provided near the top of the opening and restraining the magnetic particles inside the developer supply container together with the magnetic pole of the fixed magnetic field generating means, and the magnetic particle restraining member is arranged so as to be inclined toward the downstream side in the direction of movement of the developer holding member, and the magnetic particles are caused to fall along the magnetic particle restraining member, and the magnetic particles are tilted from the tip of the magnetic particle restraining member to the upstream side in the direction of movement of the developer holding member. A dry-type developing device characterized by supplying to.