JPH0876589A - Magnetic powder transporting device - Google Patents

Abstract

PURPOSE: To provide a magnetic powder transporting device capable of easily taking out a magnet roller from a sleeve inside. CONSTITUTION: In the side plate 1a of the developing sleeve 2 end part, the diameter of the magnet roller shaft part 4a on the side of taking out is set larger than the diameter of the magnet roller 3 main body and the end part of the large diameter is supported by the supporting member 5a. The side plate 1b of the developing sleeve 2 end part is supported by the supporting member 5b capable of allowing the magnet roller shaft part 4b on the opposite side to be taken out in the direction of taking out. Therefore, the magnet roller 3 main body can be easily taken out from the developing sleeve 2 inside without any interruption by the supporting member 5a or 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic powder carrying device used in an image forming apparatus such as a copying machine, a facsimile, a printer, etc., and more particularly to a magnetic brush developing device and a magnetic brush cleaning device. The present invention relates to a magnetic powder carrying device.

[0002]

2. Description of the Related Art Conventionally, a magnetic brush developing device and a magnetic brush cleaning device have been used in image forming apparatuses such as copying machines, facsimiles and printers. In these magnetic brush developing devices and magnetic brush cleaning devices, a magnetic powder conveying device is used which is constructed by using a magnet roller and a sleeve whose outer peripheral portion is made of a non-magnetic material. . Then, as a mode of use of the magnetic powder carrying device, the magnet roller is fixed and the sleeve is rotated. Fix the sleeve and rotate the magnet roller. Any mode such as rotating both the magnet roller and the sleeve is selected. In any of these modes, relative movement can be established between the sleeve and the magnet roller. That is, the sleeve and the magnet roller are relatively rotated.

Utilizing such a relatively rotated relationship, the magnetic brush is rolled on the peripheral surface of the sleeve, and the toner is supplied to the photosensitive member in the magnetic brush developing device to clean the magnetic brush. The device removes residual toner from the photoreceptor.

By the way, in order to obtain the above-mentioned relative rotational movement, either a sleeve or a magnet roller is rotatably supported, or both are rotatably supported. Is being considered.

For example, the one as shown in FIG. 4 is known. Side wall members 5 fixed to both ends of the sleeve 2, respectively.
Of the d and 5e, the side wall member 5 located at one end on the left side in the drawing
d is press-fitted into the end of the sleeve 2, and a magnet roller shaft 4a is pivotally supported at the center thereof. The magnet roller shaft portion 4a on one end side of the sleeve 2 is extended from the side wall member 5d to the outside, and the side plate 1 is also provided.
One end side of the sleeve 2 is supported by being fixed to a.
On the other hand, the side wall member 5e located at one end of the sleeve 2 on the right side in the drawing is also press-fitted into the other end. A shaft portion 16 formed on the side wall member 5e so as to project outward of the sleeve 2 is pivotally supported by the side plate 1b. Further, a gear 16a fixedly provided on the extended end of the shaft portion 16 is provided.
The rotary power is transmitted to the sleeve 2 and the sleeve 2 rotates. Also,
A recess is formed in the center of the inside of the sleeve 2 of the side wall member 5e, and the other end of the shaft 4b is pivotally supported therein.

In this example, the shaft portions 4a, 4 of the magnet roller are shown.
The magnet roller 3 main body is fixed to b, and the sleeve rotates with respect to the fixed magnet roller 3 main body. 5e has a structure in which the internal space of the sleeve 2 is sealed. Side wall members 5 located at both ends of the sleeve 2 for sealing the internal space of the sleeve 2
Both shaft parts 4a, 4b of the magnet roller at the center of d, 5e
The structure for rotatably supporting the magnet roller 3 is also used for rotating the magnet roller 3.

Although not shown in the drawings, the following types of ball bearings have also been proposed. The shaft portion at one end of the magnet roller is inserted into the inner race of the ball bearing in which the outer race is fitted in the hole formed in the flange press-fitted into the sleeve. At the other end, the magnet roller is open, and the protrusion formed inside the sleeve of the flange press-fitted into the sleeve enters the magnet roller through the opening, and the protrusion and the inner race are fitted together. The outer race of the combined ball bearing receives the inner surface of the magnet roller.

[0008]

However, for example, in FIG. 4 described above, the shaft members 4a and 4b are connected to the side wall member 5 as shown in FIG.
Since the shaft is rotated relative to d and 5e,
Friction is generated by sliding between the side wall members 5d and 5e in contact with a and 4b. Therefore, when the magnet roller 3 is used as it is, for example, the centers of the magnet roller 3 and the side wall members 5d and 5e are gradually displaced so that the inner surface of the sleeve 2 and the surface of the roller portion of the magnet roller 3 come into contact with each other. May occur, and the state of carrying the developer may become unstable, causing a problem such as a decrease in developing performance. Therefore, the shaft portion 4
When the a and 4b are worn, they need to be replaced, but in the conventional structure, the side wall members 5d and 5d are provided at both ends of the sleeve 2.
Since 5e is press-fitted, there is a problem that the magnet roller 3 cannot be easily taken out.

[0009] In recent years, with the rise of the idea of environmental protection, the movement to effectively use the resources has been activated, and the parts that have been used once can be reused as they are or a part of the used parts can be used as raw materials. Then, there is a movement to make a component structure that can be reused by reworking. However, in FIG. 4, for example, as described above, the magnet roller shaft portion 4
Since a and 4b are worn, there is also a problem that a used magnet roller cannot be taken out and reused as it is.

Here, when the above ball bearing is used, the relative rotation between the sleeve and the magnet roller causes sliding mainly between the bearing ball and the bearing ring between both races of the bearing,
The sliding friction that the magnet roller receives is reduced compared to when using a slide bearing, but there is also play between the inner race of the ball bearing and the supported part of the magnet roller shaft due to backlash, and the magnet roller shaft part Was worn due to sliding friction. In order to avoid this sliding friction, in order to provide the ball bearing fixedly on the magnet roller shaft, conventionally, after mounting the bearing on the magnet roller shaft, resin etc. is injected into the gap to attach the inner race of the ball bearing to the magnet roller shaft. Although it is fixed to the part, this was troublesome.

Further, in the conventional magnet roller, the shaft portion is made of metal, and the magnetizing portion is made of rubber or plastic.
In addition, since it is difficult to separate different materials, there is a problem that it is difficult to crush a part of a used magnet roller, reprocess it into another part, and reuse it.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a magnetic powder conveying device capable of easily taking out the magnet roller from the inside of the sleeve. is there.

A second object of the present invention is to provide a magnetic powder conveying device capable of preventing the wear of the magnet roller shaft in the case where the magnet roller and the sleeve are driven to rotate relative to each other.

A third object of the present invention is to provide a magnetic powder carrying device which can reprocess a used magnet roller and reuse it.

[0015]

In order to achieve the first object, the magnetic powder conveying device according to the first aspect is a hollow cylindrical sleeve having both end portions supported by side plates, and the sleeve. A magnet roller that is housed inside the sleeve and forms a predetermined magnetic field on the sleeve, and the sleeve and the magnet roller are rotated relative to each other to form the sleeve. In the magnetic powder conveying device for conveying the magnetic powder on the sleeve,
The magnet roller shaft end on the magnet roller take-out side, which is one end of the roller, is set to a diameter larger than the diameter of the magnet roller body, and the outer circumference of this large-diameter shaft can be taken out in the take-out direction. It is characterized in that the magnet roller shaft portion on the opposite side is supported by a support member so as to be removable in the removal direction.

In order to achieve the above first and second objects, in the magnetic powder conveying device according to the second aspect, at least one of both shaft portions of the magnet roller slides between the supporting member and the supporting member. The moving magnetic powder conveying device according to claim 1, wherein a shaft portion that slides with respect to the supporting member is detachably and non-rotatably fitted to the outer periphery of the one shaft by fitting the one shaft. It is characterized in that it constitutes a part.

Here, sliding means that the magnet roller shaft portion slides relatively in contact with the support member,
Not only when the magnet roller shaft is positively rotated relative to the support member, but also as a result of the play between the magnet roller shaft and the support member caused by the clearance due to the dimensional difference for mounting. This includes cases where sliding occurs between the two.

A magnetic powder carrying device according to a third aspect of the present invention is the magnetic powder carrying device according to the second aspect, wherein the magnet roller is fixedly provided.

In order to achieve the above-mentioned second object, a magnetic powder conveying device according to a fourth aspect of the present invention has a rotatable hollow cylindrical sleeve for carrying a developer on its surface, and a fixed accommodation in the sleeve. And a magnet roller for forming a predetermined magnetic field on the surface of the sleeve, wherein the sleeve is rotated to convey the magnetic powder on the sleeve. An intermediate member that keeps a constant distance between the sleeve peripheral surface and the magnet roller axis and is rotatable relative to the sleeve, and the intermediate member and the magnet roller are engaged with each other. The parts are shaped such that they can be attached to and detached from each other in the axial direction of the magnet roller, and they cannot rotate with respect to each other.

In order to achieve the above second and third objects, in the magnetic powder carrying device according to a fifth aspect, the magnet roller has a shaft portion at least at one end, and the shaft portion and the magnet roller are provided. The main body and the main body are made of the same material.

[0021]

In the magnetic powder conveying device according to the present invention, a supporting member for supporting the outer circumference of the end of the magnet roller shaft on the take-out side, the outer diameter of which is larger than the diameter of the magnet roller body. Are located around the large diameter shaft end. Therefore, the inner diameter of the large-diameter shaft end supporting space of the supporting member that supports the large-diameter shaft end is larger than the magnet roller main body having a smaller diameter than the large-diameter shaft end. . The magnet roller having both shaft portions supported by the support member so as to be removable in the removal direction does not obstruct the support member when the magnet roller is taken out from the apparatus main body through the space.

Further, in the magnetic powder conveying device of the second and third aspects, since the flange member fitted and attached to the outer periphery of the magnet roller shaft is detachably fitted to the shaft. The flange member alone can be replaced by removing it from the shaft. Further, since the flange member is non-rotatably fitted to the shaft, the outer periphery of the flange member slides with the support member when rotating relative to the sleeve. Therefore, only the flange member is worn, and the magnet roller shaft itself is not worn.

According to another aspect of the magnetic powder carrying device of the present invention,
When the sleeve rotates, the intermediate member that cannot rotate relative to the magnet roller slides between the sleeve or the member that rotates integrally with the sleeve, and the intermediate member receives sliding friction. Therefore, since the magnet roller is not directly subjected to sliding friction, the magnet roller is not worn even if the magnetic powder conveying device is used for a long period of time. Further, since the intermediate member is configured to be easily removable from the magnet roller, the intermediate member can be reused by removing the intermediate member.

In the magnetic powder conveying device according to the fifth aspect, the magnet roller and the shaft portion, which are difficult to separate, are made of the same material, so that the magnet roller and the shaft can be easily reprocessed into separate parts. (Hereafter, margin)

EXAMPLE An example in which the present invention is applied to a magnetic powder conveying device in a developing device adopted in an electrophotographic copying machine (hereinafter referred to as a copying machine) which is an image forming apparatus will be described. FIG. 3 is a schematic sectional view of the developing device according to the present embodiment. First, an outline of the entire developing device will be described with reference to this drawing. A developing device is arranged on the right side of the photosensitive drum 8 as a latent image carrier. Around the photoconductor drum 8, a known charging device, an exposure optical system, a transfer separation device, a cleaning device, and a destaticizing device (all of which are not shown) are arranged to carry out an electrophotographic process. . The developing device of this example comprises a developing device 9 facing the surface of the photosensitive drum 8 on which an electrostatic latent image is formed by the exposure optical system, and a toner container 10 attached to the developing device. ing. The developing device 9 has a casing 12 having an opening facing the surface of the photosensitive drum 8, a developing sleeve 2 partially exposed from the opening, and a toner on the surface of the developing sleeve 2. A paddle 13 for supplying a two-component developer including a carrier and stirring the developer in the casing 12,
A doctor 14 as a developer regulating means for regulating the amount of the developer supplied to the surface of the developing sleeve 2 by the paddle 13.
It has a separator (not shown) that guides the developer that is regulated by the doctor 14 and flows back to the lower portion of the casing 12. On the other hand, the toner container 10 is provided with an agitator 11 and a toner replenishing roller 15 for conveying the toner into the developing device, and these are rotatably driven by the drive from the main body side.

Next, in this embodiment, a magnet roller is used.
A configuration for making it possible to easily take out the la will be described. FIG. 1 is a schematic end view of the magnetic powder carrying device according to the present embodiment. The magnetic powder conveying apparatus of this embodiment has a developing sleeve 2 as a sleeve, which is hollow at both ends and is fixedly supported by side plates 1a and 1b, and a rotary sleeve housed inside the sleeve 2. It is composed of a possible magnet roller 3. Both shaft portions 4a, 4b of the magnet roller 3 are respectively provided with side plates 1a, 1 via bearings 6 (for example, slide bearings).
supported by b. A drive portion such as a gear 4c is formed at an end of one shaft portion 4b of the magnet roller 3 on the right side of the drawing, and a driving force from the outside (not shown) is transmitted to the drive portion. The shaft portion 4b can be taken out from the bearing of the side plate 1b when the main body of the magnet roller 3 is taken out, and the side plate 1b is provided by the E-ring 7 so that the main body of the magnet roller 3 does not inadvertently move in the thrust direction.
It is located in.

The diameter of the end of the other shaft portion 4a of the magnet roller 3 is set to be larger than the outer diameter B of the main body of the magnet roller 3, and the shaft portion 4a of this large diameter is used.
The outer circumference is rotatably supported in the bearing of the bearing 6. The outer diameter A of the large diameter shaft portion 4a is larger than the outer diameter B of the main body of the magnet roller 3.

In the above structure, the body of the magnet roller 3 having a diameter smaller than that of the large diameter shaft portion 4a passes through the hole of the bearing 6 as a supporting space for directly supporting the large diameter shaft portion 4a. The bearing 6 for supporting the outer circumferences of both the shaft portions 4a of the magnet roller does not get in the way, and the main body of the magnet roller 3 is inserted through the supporting space. It can be removed from the device body.

As described above, in the magnetic powder carrying device of this embodiment, the magnet roller 3 can be easily removed.
When it becomes necessary to replace the magnet roller 3 due to wear of the shaft portions 4a and 4b, only the magnet roller 3 can be replaced. Further, when the apparatus main body reaches the end of its life before the magnet roller shaft portions 4a, 4b are worn, the magnet roller 3 which can still be used is taken out and reused in another apparatus, so that the apparatus or component Can be used effectively. For example, if replacement is necessary, it can be replaced by the following procedure. The side plate 1b is a magnet roller shaft portion 4
The E-ring 7 for positioning b is removed, and the magnet roller shaft portion 4a is slid in the removal direction on the left side in the drawing. Then, a new magnet roller 3 is housed inside the developing sleeve 2, and the shaft portion 4a is attached to the side plate 1a.
Finally, attach the magnet roller shaft 4b to the side plate 1 with the E-ring 7.
When fixed to b, the magnet roller 3 can be replaced.

In the above embodiments, the magnet roller is used.
Although the rotor shaft portions 4a and 4b are in direct contact with the bearing 6, instead of this, the flange members 5a and 5a are provided on the outer circumference of the magnet roller shaft.
5b may be fitted so that the outer peripheries of the flange members 5a and 5b directly contact the bearing.

FIG. 2 is a schematic end view of a magnetic powder carrying device according to another embodiment of the present invention having the above-described structure. In the magnetic powder carrying device of this embodiment, the developing sleeve 2 having both ends hollow and fixedly supported by the side plates 1a and 1b, and the rotatable magnet housed inside the developing sleeve 2. And a roller 3, and the magnet roller 3
The flanges 5a and 5b fitted and provided on the outer peripheries of both shaft portions 4a and 4b are supported by the side plates 1a and 1b via bearings 6 (for example, slide bearings) provided on the side plates 1a and 1b. At both ends of the shaft, E-rings 7 are positioned so that the body of the magnet roller 3 and the flanges 5a and 5b do not move in the thrust direction of the shaft.

Further, a part of this shaft is provided with a flange 5a,
It is shaped so as to fit into the hollow portion of 5b in a non-rotatable manner. For example, a D-milling surface is formed such that the cross section cut perpendicular to the thrust direction of the magnet roller shafts 4a and 4b becomes a D-shape, and the center portion thereof is formed at the center thereof. Hollow flanges 5a and 5b having the same shape as the end portion of 4b are fitted. Further, a driving member 5c such as a gear that transmits a driving force from the outside (not shown) to the magnet roller 3 is attached to the outer periphery of the end portion of the flange 5b on the right side in the figure. Here, in an apparatus having a structure in which only the flanges 5a and 5b are replaced as in the present embodiment, it is desirable that the flanges 5a and 5b be made of one type of recyclable resin.

In the above structure, the magnet roller shaft 4
flanges 5a, fitted and attached to the outer periphery of a, 4b,
Since 5b is detachably fitted to the shaft, it can be removed from the shaft 4a, 4b and only the flanges 5a, 5b can be replaced. Further, the flanges 5a and 5b are attached to the shaft 4
Since it is fitted non-rotatably to a and 4b,
When rotating relative to the bush 2, the flange 5a,
The outer periphery of 5b slides with the bearing 6. Therefore, the main body of the magnet roller 3 is not worn on the shafts 4a, 4b itself, and therefore only the flanges 5a, 5b, which are worn, are replaced, and the main body of the magnet roller 3 is reused without the need for replacement. be able to.

Therefore, for example, the magnet roller shaft 4
the flanges 5a, which are detachably fitted to a and 4b,
When 5b is worn by sliding with the bearing 6 and is to be replaced, the E-rings 7 that fix the flanges 5a and 5b at both ends of the shafts 4a and 4b are removed, and the shafts 4a and 4b are removed.
Then, the flanges 5a and 5b are slid and removed. Then, the new flanges 5a and 5b are attached in the reverse order. Further, the magnet roller 3 can be taken out from the apparatus main body as in the embodiment of FIG. 1 described above,
In this case, in FIG. 2, the E-ring 7 fixing the right flange 5b is removed, the flange 5b is removed from the shaft 4b, and the magnet roller 3 is slid to the left to be removed from the apparatus main body.

As described above, in the magnetic powder conveying apparatus of this embodiment, the flanges 5a and 5b can be removed from the magnet roller shafts 4a and 4b, so that the shafts 4a and 4b are worn by sliding. Also, by replacing only the flanges 5a and 5b, the magnet roller body can be reused.
Further, when the life of the apparatus body is shorter than that of the magnet roller 3, the magnet roller 3 can be taken out from the apparatus body and reused in another apparatus.

Although the developing sleeve 2 is fixed and the magnet roller 3 is rotated in each of the above embodiments, the present invention fixes the magnet roller 3 and
It can be applied to a method of rotating the developing sleeve 2 and a method of rotating both the magnet roller 3 and the developing sleeve 2.

Among these methods, the method in which the magnet roller is fixed and the developing sleeve is rotated generates relatively less noise than other methods. For example, FIG. 5 shows a system in which the magnet roller 3 is fixed and the developing sleeve 2 is rotated. A supporting member 18 having a shaft portion 4b thinner than the sleeve diameter is press-fitted into the hole at the right end of the developing sleeve 2. The shaft portion 4b is mounted on the rear plate 1b via the bearing 24.
A drive member 19 such as a gear for transmitting a drive force to the developing sleeve 2 is attached to the outer end of the shaft portion 4b. The magnet roller 3 in the developing sleeve 2 is provided with shafts 4a and 4b at both ends thereof, of which the right shaft 4b has a D-cut milling cutter as shown in FIG. Is fitted in a hole provided in the bearing 17. As a result, the bearing 17
Is attached so that it cannot rotate relative to the magnet roller shaft 4b and can be easily pulled out and removed. Then, the bearing 17 is inserted into a hole provided in the support member 18, and the magnet roller 3 is supported by the rear side plate 1b via the support member 18. Here, the bearing 1
Since 7 is easy to remove, it can be reused.

According to the above construction, the inner peripheral surface of the hole formed in the support member 18 and the outer peripheral surface of the bearing 17 inserted into the hole slide when the developing sleeve rotates, so that the magnet roller shaft 4b is moved. The developing sleeve 2 and the magnet roller 3 can rotate relative to each other without receiving sliding friction.

Next, another embodiment of the intermediate member according to the present invention provided on the front side plate 1a side will be described. The intermediate member 20 has a supporting portion whose diameter is smaller than that of the developing sleeve 2 rotatably supports the developing sleeve 2 from the inside thereof.
The thrust of the developing sleeve 2 is positioned by abutting the sleeve end portion with a flange portion having a diameter larger than that of the developing sleeve 2. Then, the magnet roller 3 is fixedly provided in the developing sleeve 2, and the magnet roller shaft 3a is also D-cut milled in order to position the magnetic pole in a predetermined arrangement in the rotation direction. A hole having a shape for fitting with the shaft 4a is provided at the end portion, and the hole is fitted with the shaft 4a. The intermediate member 20 is fixed to the front side plate 1a by a stepped screw (not shown) having a tip threaded portion penetrating through a hole formed in the flange and screwed into the front surface of the front side plate 1a.

With the above construction, when the developing sleeve 2 rotates, the inner peripheral surface of the developing sleeve 2 and the outer peripheral surface of the intermediate member 20 form a sliding portion, so that the magnet roller 3 is not subjected to sliding friction. 2 and magnet roller 3
Relative rotation with can be realized. Further, by removing the stepped screw that fixes the intermediate member 20 to the front side plate 1a, the intermediate member 20 can be pulled out in the forward direction and the magnet roller 3 can be easily taken out.

In the embodiment shown in FIGS. 1, 2 and 5, the magnet roller shaft 4a, the flanges 5a and 5b, or the intermediate member 20 is directly supported by the side plate of the apparatus,
Since the extra space between the developing sleeve and the side plate can be reduced as compared with the conventional method for supporting the developing sleeve shown in FIG. 4, the apparatus can be downsized.

In order to reuse the magnet roller 3 which is difficult to separate, the magnet roller 3 and the shaft portions 4a, 4 are used.
It is desirable that b is formed of the same material, for example, plastic containing ferrite.

[0042]

According to the magnetic powder conveying device of the present invention, the outer space of the magnet roller body supports the space for supporting the end portion of the magnet roller shaft on the take-out side. Since it is smaller than the inner diameter of the magnet roller main body, when the magnet roller main body is taken out from the apparatus main body, the support member for supporting the outer periphery of the shaft end portion does not get in the way, and the magnet roller main body is inserted through the space. It has an excellent effect that it can be easily taken out. Therefore, for example, the performance of the device can be maintained only by removing the magnet roller, which has reached the end of its life due to wear of the shaft, from the device body and replacing it. Conversely, if the life of the device is shorter than the life of the magnet roller, take out this magnet roller from the device body that has reached the end of its life and use it for other devices to ensure effective use of resources. You can

According to the magnetic powder conveying device of the second and third aspects, it is possible to remove the flange member from the shaft of the shaft portion which slides with the supporting member and to wear the magnetic member by sliding. Since it is the flange member rather than the rotor shaft itself, there is an excellent effect that even if the flange member is worn out, only this member can be replaced and the magnet roller can be reused. Furthermore, if the flange member is formed by using one kind of reusable material, the material of the flange member as a consumable component can be reused,
Resources can be used more effectively.

Particularly, according to the magnetic powder carrying device of the third aspect, since the developing roller which is a source of noise is not rotated, the device can be driven relatively quietly.

According to the magnetic powder conveying device of the fourth and fifth aspects, it is not the magnet roller itself but the intermediate member that wears due to sliding when the sleeve rotates. Therefore,
It has an excellent effect that the magnet roller can be reused. Further, since the intermediate member can be easily removed from the magnet roller, one kind of reusable material is used,
Once formed, the material of the intermediate member, which is a consumable item, can be reused.

In particular, according to the magnetic powder carrying device of the fifth aspect, since the magnet roller and the shaft portion are made of the same material, both can be reused without being separated.

[Brief description of drawings]

FIG. 1 is a schematic end view showing a magnetic powder carrying device according to an embodiment of the present invention.

FIG. 2 is a schematic end view showing a magnetic powder carrying device according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a developing device according to an embodiment.

FIG. 4 is a schematic end view showing a conventional magnetic powder conveying device.

FIG. 5 is a schematic end view showing a magnetic powder carrying device according to another embodiment of the present invention.

FIG. 6 is an explanatory view of a fitting portion between a magnet roller shaft and a bearing.

[Explanation of symbols]

 1a Side plate (front) 1b Side plate (rear) 2 Developing sleeve 3 Magnet roller body 4a Magnet roller shaft (front) 4b Magnet roller shaft (rear) 4c Gear 5a Flange (front) 5b Flange (Rear) 5c Gear 5d Side wall member (front) 5e Side wall member (rear) 6 Bearing 7 E ring 8 Photoreceptor drum 9 Developing device 10 Toner container 11 Agitator 12 Casing 13 Paddle 14 Doctor 15 Toner Supply roller 16 Shaft part 16a Gear 17 Bearing 20 Intermediate member

Claims (5)

[Claims] 1. A hollow cylindrical sleeve having both end portions supported by side plates, and a magnet roller housed inside the sleeve and forming a predetermined magnetic field on the sleeve. In the magnetic powder carrying device for carrying the magnetic powder on the sleeve by relatively rotating the sleeve and the magnet roller, a magnet at one end side of the sleeve is provided. The magnet roller shaft end on the roller take-out side is set to a diameter larger than the diameter of the magnet roller body, and the outer circumference of this large-diameter shaft is supported by a support member so that it can be taken out in the take-out direction. A magnetic powder carrying device characterized in that the magnet roller shaft is supported by a support member so that it can be taken out in the take-out direction. 2. The magnetic powder conveying device according to claim 1, wherein at least one of both shaft portions of the magnet roller slides with the supporting member, and slides with the supporting member. A magnetic powder conveying device, characterized in that a shaft member is detachably and non-rotatably fitted to the outer periphery of the one shaft to constitute the one shaft part. 3. The magnetic powder conveying device according to claim 2, wherein the magnet roller is fixedly provided. 4. A sleeve having a rotatable hollow cylindrical sleeve for carrying a developer on a surface thereof, and a magnet roller fixedly accommodated in the sleeve and forming a predetermined magnetic field on the surface of the sleeve. In a magnetic powder conveying device for rotating the magnetic powder on the sleeve by rotating the magnet, a constant distance between the sleeve peripheral surface and the magnet roller axis is provided between the sleeve and the magnet roller. Keep
In addition, an intermediate member that can rotate relative to the sleeve is interposed, and the mutual engaging portions of the intermediate member and the magnet roller can be attached to and detached from each other in the axial direction of the magnet roller, and can rotate with respect to each other. A magnetic powder conveying device characterized by having a shape that is impossible. 5. The magnetic powder conveying device according to claim 4, wherein said magnet roller has a shaft portion at least at one end, and said shaft portion and the magnet roller body are made of the same material.