JPS5932370B2 - Magnetic powder transport device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic powder conveying device (hereinafter simply referred to as a conveying device) that magnetically concentrates and conveys granular magnetic material.

Specific application examples of the conveyance device include ([) when it is used to convey the developer of an electrostatic latent image developing device and visualize an image, (to collect magnetic particles from a liquid containing ID magnetic particles), When used as a separator for transporting magnetic particles, the oblique magnetic particles may be arranged in one direction.

A conventional conveying device is comprised of a permanent magnet that collects granular magnetic material, a prime mover that drives the permanent magnet, and a transmission device.

The above-mentioned permanent magnets for concentrating the granular magnetic materials can be produced by stacking magnetic yokes and permanent magnets in order to generate a strong magnetic field, or by lining up small anisotropic magnets to concentrate the magnetism in one direction. etc.

Furthermore, since conventional magnets have problems with mechanical strength, a method is used in which a shaft is passed through a cylindrical magnet and bonded to the magnet in order to maintain mechanical strength.

In order to facilitate understanding of the conventional conveying device, a roller-type magnet for concentrating granular magnetic material in a developer conveying device used as a visualization means of an electrostatic latent image developing device will be described below.

This developing method using a magnet is commonly called a magnetic brush developing method or a carrierless developing method and is widely applied to developing parts of electronic copying machines and printers of facsimile receivers.

For example, U.S. Patent No. 2,786,439, U.S. Pat.
Specification No. 86441, Specification No. 2874063, Japanese Patent Publication No. 37-14798, Japanese Patent Publication No. 49-498
This technique is described in Publication No. 532 and the like.

The above-mentioned known developing methods can be roughly divided into two types: methods using a two-component dry developer consisting of an iron powder carrier and resin toner, and methods using a one-component dry developer consisting of a conductive or insulating magnetic toner. There is.

As a special case, a wet development method using a developer in which a magnetic pigment is dispersed in a highly insulating liquid has also been proposed, and the apparatus of the present invention described later can be applied to any of them.

In addition, in the above-mentioned known development methods, there are cases in which the above-mentioned magnetic developer is attached directly to the surface of the magnet, and cases in which the magnetic developer is attached through a thin plate of conductive or insulating non-magnetic material close to the magnet. However, the present invention is applicable to any of them.

Furthermore, in the above-mentioned known developing method, three methods can be considered for the purpose of conveying the magnetic developer: a method of moving only the magnet, a method of moving only the non-magnetic thin plate, or a method of moving both relatively. , the device of the present invention is applicable to any of those cases.

However, the roller type magnet in the device of the present invention is limited to one that is magnetized (permanently magnetized) in the radial direction.

Conventionally, isotropic ferrite magnets or alnico alloy magnets have been commonly used as roller-type (cylindrical) permanent magnets for developing electrostatic latent images.

Practically speaking, these ferrite and alnico magnets each have a diameter of at least 15 thresholds or more, preferably 2
30mm is required from 0rrvn.

Therefore, the developing device has become larger, and electronic copying machines including the device,
Facsimile printers, computer output printers, etc. have the disadvantage of being large in size and shape.

The reason is that when the diameter of the cylindrical magnet becomes less than 15 circles,
This is because when magnetized in the radial direction, the magnetic flux density on the surface of the magnet decreases, and "fogging" in non-image areas becomes insufficiently removed, making it difficult to obtain a clear image.

According to the experiments of the present inventors, isotropic sintered barium ferrite is magnetized with 4 opposite poles (8 poles) of the same type as shown in Fig. 2 using a cylindrical magnet of 15 mm φ (diameter) x 250 WrIn (longitudinal direction). In this case, the magnetic flux density of one pole on the surface is 500 Gauss or less, and for example, when developing with a -component magnetic developer (
It has been found that when used in the technique disclosed in Japanese Patent Application Laid-Open No. 49-4532, the magnetic adsorption force is weak, giving unsatisfactory results in removing "fogging" in non-image areas of toner.

Furthermore, in the case of alnico magnets, the residual magnetic flux density is larger than that of ferrite magnets, but because the coercive force pJ\ is smaller, the spatial magnetic flux density required for practical use is significantly lowered.

Therefore, it is difficult to put this into practical use.

Furthermore, although rare earth cobalt-based magnets have large magnetic energy and can provide sufficient magnetic flux density, they are extremely expensive and have the same drawbacks as ferrite-based magnets in terms of the structure described below.

Next, we will discuss the problems with the structure of conventional roller magnets.

In normal copying machines, the width of the developing device, that is, the length of the permanent magnet, is required to be 300 mm or more in order to make copies of B4 size or larger paper, but conventional ferrite and alnico magnets However, it is very difficult to manufacture the aforementioned long objects in one piece, and in most cases, several short magnets are bonded together with resin for practical use.

Therefore, in order to make the magnetic flux distribution on the surface uniform in the length direction, 100% selection is required, resulting in a poor manufacturing yield and an increase in the number of man-hours, resulting in an increase in cost.

Unfortunately, in order to rotate or fix the permanent magnet bar, a central support shaft is required, but since conventional magnets have low mechanical strength, it is impossible to cut them during processing, and from an industrial perspective, it is difficult to It was thought that it would be almost impossible to manufacture an integral part that also served as a central support shaft, which always had to rely on difficult polishing methods.

1. Conventionally, the drive device that goes into the conveyance device uses an electric motor as the prime mover, and the transmission device uses a belt, chain, etc.
gears were used.

Incidentally, the conveyance device is often built into the device, and therefore it is desirable that the conveyance device has a long life and does not require maintenance.

Furthermore, a low-cost, high-performance, and small-sized device is particularly desired as a developing device for a copying machine.

However, as mentioned above, conventional conveying devices are made up of many individual parts, so they also require parts to connect each part, are time-consuming to assemble, and are complicated and large. It had no choice but to become a transport device.

Moreover, since the device is large, the space in which the device is placed also becomes large, making it difficult to obtain a small and inexpensive device.

Furthermore, since the number of parts is large, the failure rate is high, and there are many problems such as wear and tear of the transmission device parts, making it difficult to guarantee a long life.

In order to develop an inexpensive, compact, and lightweight conveying device, the present inventors focused on manganese-aluminum-carbon alloy magnets, which have large magnetic energy, high mechanical strength, and are easy to cut, and developed a conveying device. As a result of a detailed study of its application, as will be described later, we succeeded in creating an extremely compact, lightweight, and high-performance transport device, which had previously been considered difficult.

Regarding the manganese-aluminum-carbon alloy magnet and its manufacturing method, see US Pat. No. 3,944,445,
Japanese Patent Publication No. 50-46508, 1983-563
As detailed in Japanese Patent No. 06, No. 50-60213, etc., the magnetic properties and mechanical properties of this alloy magnet are improved by warm plastic working.

For the above-mentioned purpose, the present inventors have detailed a method for manufacturing a manganese-aluminum-carbon alloy magnet, which is a round bar magnet with a diameter of 15 mm or less and a length of 300 mm or more, magnetized in the radial direction. As a result of our investigation, we found that by extruding an alloy whose basic composition is aluminum at 530°C to 830°C, it is possible to produce a magnet that satisfactorily achieves the initial objectives in terms of magnetic properties, mechanical strength, and machinability. I found it.

Here, the degree of anisotropy of the manganese-aluminum-carbon alloy magnet was determined using the above-mentioned known technique and Examples 1 and 2 described below.
It is clear that there is a close relationship with the composition, but
It is also related to extrusion processing conditions.

Magnetic properties and degree of anisotropy vary greatly depending on extrusion processing conditions, ie, processing temperature, processing speed, die shape, lubrication state, etc.

According to the detailed study results of the present inventors, it has been found that among these factors, the shape of the die, that is, in the case of a conical die, is significantly influenced by the die angle.

Regarding the die angle as a method for manufacturing anisotropic manganese-aluminum-carbon alloy magnets JP-A-51-83053
As detailed in the publication, it is said that a die half angle of 5° or more and 20° or less is the die angle necessary to obtain the axial anisotropy of (B H)mar≧6 MGOe, and in particular, a half angle of 7. Largest (B H) ma between 5° and 10°
y is obtained.

The magnet required to achieve the present invention does not have to have large magnetic properties in the axial direction, but rather has a large surface magnetic flux density in the radial direction.

Therefore, we investigated the relationship between the die angle and the radial surface magnetic flux density, and found that the radial surface magnetic flux was large in the die half angle range of 7.5° to 45°, and the radial surface magnetic flux was large in the die half angle range of 7.5° to 45°. When magnetized, a magnetic flux density of 1000 G (Gauss) or more was obtained in a space 0.5 mm away from the surface.

Among them, the range in which the largest value of the radial surface magnetic flux density was obtained was a die half angle of 10° to 30°.

In addition to extrusion, rolling can be used as a plastic working method to improve the performance of manganese-aluminum-carbon alloy magnets, but when a long round bar is manufactured using grooved rolls, the surface magnetic flux density is different from extrusion. You can get almost the same thing, but
The deviation of the magnetic flux in the longitudinal direction is slightly larger than in the case of extrusion, and the productivity is also inferior to that in the case of extrusion.

When using the manganese-aluminum-carbon alloy magnet described above, as will be explained in detail in the examples below, 1
Even in a small diameter of 0wnφ, when magnetized with 2 poles symmetrically in the radial direction (see Figure 1) and when magnetized with 8 poles (see Figure 2), the surface height is 0.5 - space apart. It was found that the magnetic flux densities all exhibited values of 1000 Gauss or more, and the deviation in the length direction was ±10φ or less, indicating extremely excellent developing magnet characteristics.

Figures 1 and 2 show cross-sectional views of respective examples of cylindrical permanent magnets used in the present invention, Figure 1 is for two-pole magnetization, and Figure 2 is for eight-pole magnetization. It is.

In these drawings, numeral 1 indicates the permanent magnet body, and numeral 2 indicates the magnetic flux radiated outward from the magnet surface.

Figure 3 shows permanent magnets (10g+
+φ) is a diagram showing the relationship between the maximum distribution of spatial magnetic flux density in the radial direction and the distance from the surface of the permanent magnet.

FIG. 4 is a diagram showing the distribution of the maximum value of the surface magnetic flux density in the axial direction of the multipolar magnetized permanent magnet shown in FIG.

FIG. 5 is a perspective view of an example of a permanent magnet used in the present invention, and reference numeral 5 in the figure indicates a support portion with a bearing for rotatably supporting the permanent magnet body 1.

FIG. 6 shows a perspective view of an embodiment of the present invention in which the permanent magnet body 1 of FIG. 5 is equipped with a rotational driving field part. This is a drive device for rotationally driving the permanent magnet body 1 using a rotor as a field part (stator) that creates a rotating magnetic field.

Further, reference numeral 4 denotes a bearing portion fitted on the outer periphery of the support portion 5 to rotatably support the permanent magnet body 1.

FIG. 7 shows an example of the drive devices 3a and 3b in FIG. 6, where a is a perspective view and b is a front view.

In the figure, 30 is a concentrically wound excitation winding, 31.
Reference numeral 32 denotes an elongated rectangular magnetic body whose N and S poles are formed by passing a current through the excitation winding 30, and these are arranged alternately at a predetermined interval on the first side of the excitation winding 30. The magnets protrude from each other and are arranged side by side on the same circumference, and their inner surfaces face the magnetized surface of the permanent magnet body 10 with a predetermined gap therebetween.

FIG. 8 shows a perspective view of another example of the drive devices 3a and 3b, which shows magnetic bodies 31 and 32 that become N pole and S pole when the excitation winding 30 is energized, respectively. This is basically the same as the one shown in FIG. 7.

FIG. 9 shows a partially cutaway perspective view of another embodiment of the present invention,
This is equipped with a sleeve 6 made of a non-magnetic material around the outer periphery of the permanent magnet body 1, and drive devices 3a and 3b as shown in FIG. 1 or 8 are gathered on one side of the permanent magnet body 10. The figure also shows the connection relationship with the AC power supply (AClooV).

In the same figure, since one drive device 3b is connected to the AC power supply via a capacitor 7, the phase of the excitation current is ahead of that of the other drive device 3a, and 3at3b
creates a rotating magnetic field.

FIG. 10 is for explaining the rotation principle of the conveying device shown in FIG.
3 shows a side development view of b, and the arrow indicates the direction of rotation.

FIG. 10A shows a state in which the drive device 3b is maximally excited, and FIG. 10B shows a state in which the drive device 3a is maximally excited.

FIG. 10C shows the phase relationship of the excitation currents flowing through the drive devices 3a and 3b, where current Ia excites the drive device 3a, and current Ib excites the drive device 3b.

In the state shown in FIG. 10A, the driving device 3bK current flows at its maximum.

Each magnetic body 31b group is excited to the S pole, and the 32b group is excited to the N pole, and in the permanent magnet main body 1, the KN pole of the magnetic body 31b group and the S pole of the magnetic body 32b group are respectively opposed.

In FIG. 10B, in the same way as described above, the drive device 3a on the right side is excited, and the ON pole of the permanent magnet body 1 is connected to the magnetic body 3.
From 1b to 31a, the south pole moves from magnetic body 32b to 32a.

Therefore, when the drive devices 3a and 3b are excited with alternating current of different phases, the permanent magnet body 1 rotates by 120 degrees per cycle of the alternating current as described above.

It should be noted that the present invention is not limited to the structure shown in FIGS. 7 and 8 as a drive device for rotationally driving the permanent magnet body 1. You can also use parts.

Furthermore, if a three-phase AC power source is used, it is possible to create an even cheaper field section and therefore a drive device.

The mechanical strength of the permanent magnet used in the present invention has a tensile strength of 30 #/- or more, a transverse rupture strength of 20 kq/vjt or more, which is comparable to cast iron (FC-30), and a bending hardness of HRc
50 to 55, and has excellent abrasion resistance. It also serves as the central support shaft of the cylinder and can be cut with a lathe, making it easier to downsize.

The fact that the central shaft and magnet can be integrally molded makes it easier to make the magnet smaller and lighter, and at the same time simplifies the manufacturing process and contributes to a significant cost reduction.
This is an advantage of being an industrial dog.

In conventional ferrite sintered magnets, for example, S' is attached to the central support shaft.
[It was necessary to provide J3304 material etc. as a separate material.

It is clear that the bending strength and hardness of this support shaft are particularly important when the magnet is rotated at, for example, 100 rpm or more.

Next, the present invention will be explained in more detail with reference to specific examples.

[Example 1] An alloy having a composition of 69.30% Mn, 0.43% C, and the balance At was melted and cast to a diameter of 40 threshold φ and a length of 40 mm.
A billet of rrvn was prepared, solution treated at 1100°C for 1 hour, air cooled to 600°C, and heated at 600°C for 3 hours.
After holding for 0 minutes, extrusion processing was performed at 700℃ to obtain a diameter of 1
A round bar A having a diameter of 0 mm and a length of 640 mm was obtained.

The obtained round bar A was cut into rounds with a thickness of 10 mm, and the magnetic properties in the axial direction of the bar were measured. Br = 6300 G
, B Hc =22000 et (B H)m
ax=6.1MGOe, and was anisotropic in the extrusion direction.

As shown in Fig. 1, the magnetic flux density on the surface of the round bar A when it is magnetized with two poles in the radial direction is a maximum of 1400 G when measured with a micro Hall element. Sufficient magnetic flux density was obtained even when used in the radial direction.

The change in magnetic flux in the longitudinal direction was within ±5G over the length of 3001rar1.

In addition, the mechanical properties of the above round bar are tensile strength = 40 kg/m
A. Difficulty force = 35@/m? The hardness was HRc=55 at t, and cutting with a lathe using a carbide cutting tool was easily performed.

[Example 2] An alloy having a composition of 72.01% Mne 1.15% C and the balance A7 was extruded in the same manner as in Example 1 above.

This is called round bar B. As a result of measuring the magnetic properties of the round bar B, it was found that it is isotropic, and the magnetic properties are 1 in both the axial and radial directions.
3r=3400G.

BHc =24500e, (BH)max =2
．． It was 2MGOe.

As a result of magnetizing the round bar B in the radial direction in the same manner as in Example 1, a maximum magnetic flux density of 1600G at the surface was obtained.

The mechanical strength is tensile strength of 35 kg/ynrjt and transverse rupture strength. was 30Ay/z7j, the hardness was HRc=51, and the machinability was also good.

[Example 3] The round bars A and B produced in Examples 1 and 2 were each processed into a roller shape having integral shaft portions at both ends as illustrated in FIG.

Roller A'tsu It is called B'.

Drive devices 3a and 3b were installed at both ends of the rollers A/ and B/ as shown in FIG.

The permanent magnet main body 1 has a multipolar structure of 2 or more and 12 or less, which is suitable for practical use.
, 3b may be magnetized with a different number of poles than the central portion.

Conveying speed of magnetic particles G: The lowest speed is obtained when the central part of the permanent magnet body 1 has 2 poles and the driving part has 12 poles,
In addition, the highest speed can be obtained if the central part has 12 poles and the driving part has 2 poles, and the driving part has 2 poles.
Even in a continuous test of 10,000 hours at a frequency of 60 Hz and a rotation speed of 360 rpm, no wear of the bearing portion (shaft portion) 5 was observed in practical terms.

The rolled rollers p, /, and B/ of this embodiment can be made smaller and lighter by about 1/3 in diameter and about 1/1 in weight compared to conventional rollers using ferrite magnets.

Furthermore, in a comparison including the drive device, the volume is about 1/2 of the conventional one.
It was made smaller and lighter.

[Example 4] Two types of rollers A'yB' having the dimensions shown in FIG. 5 created in Example 3 were constructed as shown in FIG. 6, and an electrostatic latent image was developed using a two-component developer. We conducted an experiment.

First, as shown in FIG. 1, two poles were magnetized in the radial direction, and the driving portion was magnetized with twelve poles.

200 mesh of reduced iron powder 30 is placed on the surface of the roller A'.
A magnetic brush was formed by applying a dry developer uniformly mixed with 3 g of commercially available zinc oxide paper developing toner to the magnetic brush almost uniformly in the longitudinal direction.

Next, place the magnetic brush in a fixed position in a dark place, and
When 00V, 60Hz AC voltage was applied, 600
It started rotating at rpm.

A latent image (maximum potential -400 volts) on zinc oxide photosensitive paper, on which a latent image of negative polarity was previously formed using a commercially available electrofax copying machine, was slid onto a rotating magnetic brush, and the speed at which the paper moved was as follows. The rotation direction of the roller was set at 1 cfn/sec in the opposite direction.

The surface image produced on the entire A4 size plate had a high degree of blackening, and was satisfactory with only midtones.A similar experiment was conducted again with roller B', but the image quality produced was essentially the same as that of roller A'. No difference was observed.

[Example 5] Using two types of rollers A/ and B/ having the dimensions shown in FIG. 5 prepared in Example 3, an experiment was conducted to develop an electrostatic latent image using a one-component developer.

First, as shown in FIG. 1, two types of magnetization were performed in the radial direction, and the driving portion was magnetized with eight poles.

As shown in Figure 9, roller A' has an inner diameter of 11.
m++φ and is located concentrically within an aluminum sleeve with an outer diameter of 12 mφ, and the roller A' inside the sleeve can freely rotate, but the sleeve is stationary.

Next, the developer 10' of the electronic copying machine (Sumitomo 3M Ltd. Model 191)? was uniformly deposited on the sleeve, and when an AC voltage of 100 V and 60 Hz was applied to the drive device, roller A' rotated at 900 rpm,
The average length of developer particles on the sleeve is 5m! /second in the opposite direction to the roller.

Next, use a commercially available electrostatic facsimile machine (Panafax 2000 manufactured by Matsushita Transmission Equipment Co., Ltd.) to move the latent image surface (maximum potential of about -300 volts) of electrostatic recording paper on which an electrostatic latent image of negative polarity has been formed. The developer inside was slid onto the sleeve on the surface.

The sliding speed of the electrostatic recording paper is 1c with respect to the stop sleeve.
m/sec.

The resulting image after development has a density of 1.5 in the recording area and 0.2 in the non-image area.
A similar experiment was carried out again using roller B', but no essential difference was observed in the quality of the image produced compared to roller A'.

Next, rollers AI and B/ were each subjected to 8-pole magnetization as shown in FIG. 2, and a development experiment using a one-component developer was conducted under the same conditions as in the case of two types of magnetization.

At this time, the moving speed of the developing paper on the sleeve was approximately four times that in the case of two-type magnetization.

However, the generated image was essentially no different from the case of two types of magnetization.

[Example 6] Two types of rollers A/ and B/ having the dimensions shown in FIG. 5 created in Example 3 had eight magnetic poles as shown in FIG. A large number of elongated magnetic bodies with a length of 330 m+++ and an inclination of 15 degrees were arranged as stators.

When the permanent magnet body formed as described above was configured as illustrated in FIG. 9, the rotational torque became smooth and vibrations were significantly reduced.

In addition, when the conveying device according to this embodiment is used as a developing device of a copying machine, the particles move in the axial direction, and the developer is distributed both circumferentially and axially. [Example 7] Example 60 A conveyance device as shown in FIG. 9 is constructed using rollers A/ and B/, and the drive device 3a.

3b in the configuration illustrated in FIG. 1, the magnetic body 31.3
The width of 2 is 1 of the magnetized width of the roller magnet body - the number of roller rotations 2
At 0.00 rpm, an axial amplitude of about 1 kaku could be obtained.

When the conveying device of this example is used as a magnetic separator for granular magnetic materials, non-magnetic particles that were conventionally included in a group of magnetic particles are now almost completely separated by vibration. .

Furthermore, when used in an electrostatic copying device, contact with electrostatic recording paper is improved, uneven development is reduced compared to the conventional method, and black areas are no longer missing.

In Example 6, when magnetization is performed in a spiral shape with a larger inclination, the axial mobility of the magnetic particles is further increased, and it is also possible to supply and capture the magnetic particles at one end. .

Furthermore, since this embodiment can be of a direct drive type as illustrated in FIGS. 6 and 9, it is easy to seal the device from liquids, and therefore it is possible to use it in liquids.

As is clear from the above description, the conveyance device of the present invention can be made smaller and lighter than conventional conveyance devices because it does not require a special rotation transmission device.

Furthermore, since the number of parts can be reduced, assembly becomes easier, and there are fewer places where parts wear out, resulting in a longer life.

Therefore, even when a large number of the conveying devices of the present invention are arranged to form a magnetic separator, the device is smaller and has a larger effective surface area than conventional devices, resulting in a small and high-performance separator.

Furthermore, even if a large number of conveyors are arranged in a line and used as a magnetic conveyor, a compact and high-performance conveyor can be obtained.

Furthermore, when used as an electrostatic latent image developing device, it is much smaller, lighter, and less expensive than conventional developing devices of the same type, and has great industrial advantages.

Furthermore, in an electrostatic latent image developing device, even when a plurality of magnets are lined up and the contact time between the electrostatic latent image and the developer is not kept for a relatively long time, when the above-mentioned magnet is used, the magnet It is clear that it occupies a smaller volume and therefore the entire developing device can be made smaller and lighter.

Although the above-mentioned embodiments of the present invention have been described with reference to the case where the magnets are magnetized to even numbered poles, it is easily understood that the present invention can also be applied to the case where the magnets are magnetized to odd numbered poles using well-known techniques. be.

It goes without saying that the permanent magnet main body 1 is not limited to a cylindrical shape, but may be cylindrical if necessary.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing each side of a permanent magnet that can be used in the present invention together with magnetic flux patterns, and FIG.
The figure shows the relationship between the distribution of the maximum value of the spatial magnetic flux density in the radial direction of the permanent magnet shown in Figures 1 and 2 and the distance from the surface, and Figure 4 is an example of the relationship shown in Figure 1. Fig. 5 is a perspective view of an example of a cylindrical permanent magnet used in the present invention, and Fig. 6 is a diagram showing the distribution of the maximum value of surface magnetic flux density in the axial direction of a permanent magnet. Main part perspective views, Figures 1a and 1b are -ψ of the drive device that can be used in the present invention.
FIG. 8 is a perspective view of another example of a drive device that can be used in the present invention, FIG. 9 is a partially cutaway perspective view of another embodiment of the present invention, and FIG. 10A , B, and C are diagrams for explaining the driving principle of the embodiment of the present invention. 1...Permanent magnet body, 3a, 3b...
Drive device, 4...Bearing section, 5...Supporting section, 6...Sleeve, I...Capacitor, 30...Excitation winding Line, 31°32---
- Magnetic material, 31a, 31b, 32a. 32b...Magnetic material group.

Claims (1)

[Scope of Claims] 1. A permanent magnet formed by radially magnetizing a cylindrical rod or a cylindrical rod-shaped magnetic member, a means for rotatably supporting the permanent magnet, and a means for rotatably supporting the permanent magnet, and a means for rotatably supporting the permanent magnet. A part of the permanent magnet is used as a rotor, and is equipped with a drive device that applies a rotational driving force by electromagnetic action, and a part of the permanent magnet that is not directly related to the drive device is used to drive the powdery magnetic material. A magnetic powder conveying device characterized in that the magnetic powder is conveyed in a concentrated manner. 2. In the description of claim 1, the drive device includes an excitation coil and a plurality of fixed magnets each having an N pole and an S pole that generate a rotating magnetic field by energizing the excitation coil. What is claimed is: 1. A magnetic powder conveying device characterized by being configured including a body. 3. In the description of claim 2, the plurality of magnetic bodies have a north pole and a south pole in the circumferential direction of the permanent magnet.
4. A four-magnetic powder conveying device, characterized in that the poles are arranged in parallel so as to face the magnetized surfaces of the permanent magnets in such a relationship that the poles are alternately formed. 4. In the description of claim 3, the plurality of magnetic bodies are formed as elongated rectangular plate-like bodies, and the center line in the longitudinal direction thereof is aligned with the rotation axis center line of the permanent magnet. 1. A magnetic powder conveying device characterized in that the magnetic powder conveying device is arranged in parallel at an angle with respect to the magnetic powder. 5. Claims 1, 2, 3, or 4 are characterized in that a manganese-aluminum-carbon alloy is used as the magnetic member constituting the permanent magnet. Magnetic powder transport device. 6. A magnetic powder conveying device according to claim 5, wherein the permanent magnet is rotatably housed inside a fixed sleeve made of a non-magnetic material.