JPH10153905A - Developer treating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent developer from entering the supporting part of a rotary member rotatably arranged in a container housing the developer caused by an electric field generated by the electric charge of the rotary member when the rotary member is electrostatically charged by the rotation thereof. SOLUTION: The rotary shaft 50 of a stirring and carrying roller 5 being the rotary member is freely rotatably supported by the side wall surface 3a of a developing tank 3 housing the developer through a bearing part 52. A conductive thin shield member 11 consisting of aluminum and the like is stuck to the inside of the side wall surf ace 3a at the bearing part 52 of the tank 3 so as to cover the bearing part 52. Since the tank 3 is provided with the shield member 11, the electric field, specially, the line of electric force generated by the electric charge is shielded even when the tank 3 is electrostatically charged to positive by the rotation of the roller 5 so that the developer is prevented from flocculating toward the supporting part of the shaft 50. Thus, the developer is prevented from entering the shaft supporting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developer processing apparatus for transporting or agitating a developer, in which the rotation of the developer to a portion for rotatably supporting a member for transporting or agitating the developer is prevented. To a device for blocking the

[0002]

2. Description of the Related Art In an image forming apparatus employing an electrophotographic method, such as a copying machine or a printer, an electrostatic latent image is formed on the surface of a photoreceptor as a recording medium, and a visual image is formed. There is provided a developing device that supplies a developer such as a toner as a colorant to the photoconductor side and attaches the toner.

The developing device develops the electrostatic latent image formed on the photoreceptor, and the developed toner image is transferred to a transfer material, such as a sheet. After the transfer, a part of the toner that has not been transferred remains on the surface of the photoconductor. The remaining unnecessary toner is also removed from the photoreceptor surface in order to repeatedly perform the next image formation. Therefore, a cleaning device that removes the toner remaining on the surface of the photoconductor after the transfer is provided, and the unnecessary toner removed by the cleaning device is stored in a storage unit in the cleaning device.

Therefore, conventionally, a developing device for developing an electrostatic latent image formed on a photoreceptor and a cleaning device for removing toner remaining on the surface of the photoreceptor are provided. It is necessary to treat toner in the form of fine particles. In particular, a rotating member that transports the toner to a container that forms the developing device or the cleaning device, such as a developing tank in the case of the developing device, or a toner container in the case of the cleaning device, is provided. .

The rotating member provided in the developing device is a stirring member for stirring the developer in the developing tank, or a conveying member for feeding the developer to the photosensitive member. Further, also in a member provided for replenishing toner to the developing tank, a rotating member for conveying and stirring the developer to be rotated is provided, and these constitute a developer processing apparatus. .

Further, the cleaning device is provided with a transport member, for example, a screw member, for sending the toner temporarily stored in the storage section to the collection container, as the rotating member. The processing unit for the developer is constituted by the accommodating section and the like.

[0007] These rotating members are rotatably supported by a toner accommodating portion of a cleaning device and a developing tank constituting a developing device. For this reason, a fine powder such as toner enters the supporting portion that supports the rotating member, thereby creating a cause of occurrence of rotation failure.

Therefore, as a conventional technique for supporting a rotating member, there is a technique disclosed in Japanese Patent Laid-Open No. 3-189666, for example. A sealing material made of rubber or the like is used to seal a portion supporting the shaft of the rotating member. (V-ring or the like) is provided to prevent powder such as toner from entering the support portion.

Further, Japanese Patent Publication No. 64-8211 discloses that a shielding portion is formed by magnetic force in the vicinity of a supporting portion of a shaft of a rotating member to prevent developer from entering the shaft supporting portion. I try to prevent it.

[0010]

According to the above-mentioned prior art, in a developing device including a toner replenishing section or a developer processing device provided in a cleaning device, a rotating member for stirring or transporting the developer is used. Are rotatably supported by a support portion provided in a container for storing the developer, and effectively prevent the developer from entering the support portion. For this reason, it is possible to prevent the cause of poor rotation or the like due to the intrusion of the developer.

However, the developing tank for supporting the rotating member and the accommodating portion of the cleaning device, the screw roller for transporting or stirring the developer for forming the rotating member, and the like are easy to mold. Inexpensive resin materials and the like are generally used. A shaft for rotating the screw roller and the like and a supporting portion thereof are usually made of a metal material such as aluminum or stainless steel from the viewpoint of strength and durability.

The screw roller, which is a rotating member formed by resin molding, is frictionally charged while the developer is being conveyed, and a potential of hundreds to thousands of volts is generated on the surface of the resin member by the charged charge. Therefore, an electric field is generated between the resin member and a shaft or a support member for rotatably supporting the resin member, and the charged developer adheres to the shaft or the support member and aggregates. For this reason, even if the above-described conventional blocking member is provided, the developer enters the support portion during long-term operation, and there is a risk of poor rotation.

For example, as shown in FIG. 2, when the rotating member (5) rotates, the container itself is positively charged, for example, by friction with the developer contained in the container (3). An electric charge of the opposite polarity corresponding to the charged electric charge is induced in the conductive rotating shaft (50), and a line of electric force runs therebetween,
An electric field is generated. The developer (2), for example, toner, charged along this electric field, particularly the line of electric force, adheres to the rotating shaft (50) and gradually aggregates. As a result, even if the seal member (V ring 53) is provided, the developer (2) gradually enters the bearing portion (52).

In view of the above-mentioned disadvantages, the present invention eliminates the obstacle caused by the electric field generated by frictional charging even when the rotating member is formed of resin, and the developer supports the rotating shaft of the rotating member. It is an object of the present invention to effectively prevent intrusion into a supporting portion to be formed.

[0015]

According to the present invention, there is provided a developer processing apparatus for achieving the above object, in which a rotatable rotating member is provided in a container for storing a developer, and the developer in the container is provided. In a developer processing apparatus having a structure for transporting or agitating by rotation, a shield member is provided on an inner wall surface of the storage container of a support portion provided with the rotatable member rotatably. For example, as shown in FIG. 1, an electric field generated by electric charges generated at the position of the side wall surface (3a) of the bearing portion (52) of the developer container (3) is:
The line of electric force is shielded by the shield member (11). Therefore, the developer (2) is applied to the bearing portion (52).
In particular, the developer 2 can be prevented from adhering to and coagulating on the rotating shaft (50) near the side wall surface (3a) of the developing tank.

According to the present invention, there is provided a developer processing apparatus for achieving the above object, in which a rotatable rotating member is provided in a container for storing a developer, and the developer in the container is conveyed by rotation. In a developer processing apparatus having a structure for stirring or stirring, a shield member is provided on a rotating member side opposite to a portion for rotatably supporting the rotating member. According to this configuration, as shown in FIG. 5, the lines of electric force caused by the electric field generated in the rotating member (5) are
It is possible to shield the shield member (12) without reaching the area (0). Therefore, adhesion and aggregation of the developer in the vicinity of the support portion (52) can be prevented.

Further, according to the present invention, a developer processing apparatus for achieving the above-mentioned object is provided with a rotatable rotating member in a storage container for storing a developer, and transports the developer in the storage container by rotation. In the developer processing apparatus having a structure in which the rotating member is rotatably provided, a first shield member is provided on an inner wall surface of the storage container of a supporting portion in which the rotating member is rotatably provided, and the rotatable member is rotatably supported. A second shield member is provided on the side of the rotating member opposite to. Also in this case, similarly to the above, it is possible to prevent the developer from adhering to the rotating shaft, particularly the rotating shaft near the bearing portion, and agglomerating due to the triboelectric charge generated in the storage container and the rotating member.

In the developer processing apparatus having the above-described configuration, if the area of the shield member, particularly the area in a planar state, is larger than the projected area of the rotating member in the rotation axis direction, the container for storing the developer is provided. And the lines of electric force due to electric charges generated in the rotating member can be reliably shielded, and the shielding effect of the electric field can be promoted.

In the developer processing apparatus having the above-described structure, the radius of the shield member is d, and the distance between the shield member and the inner wall surface of the developer container is a.
At this time, if the shield member is arranged so that the relationship a <d is established, the influence of the electric field due to frictional charging or the like is eliminated, and therefore, the developer adheres to the rotating shaft and agglomerates. Can be prevented from entering the bearing portion.

On the other hand, a developer processing apparatus for achieving the above-mentioned object according to the present invention is provided with a rotatable rotating member in a storage container for storing a developer, and transports the developer in the storage container by rotation. In a developer processing apparatus having a structure for stirring or stirring, a shield member in which the rotating member closest to the side wall surface of the storage container and a blade or a screw portion for stirring or transporting the developer is coated with a conductive member. Is provided. For example, as shown in FIG. 10, a container (3) for storing a developer is provided on a blade (5a) or a screw blade constituting a rotating member (5).
The shield member (18) coated with a conductive material such as aluminum is provided on the one closest to the side wall (3a) of the first embodiment. Thus, it is possible to prevent the developer from entering the shaft portion as in the case of the above-described developer processing apparatus. As described above, by providing the rotating member with the shield member, it is not necessary to separately attach the shield member to the rotating member or the like, and the assembly and the like are simplified. That is, it is possible to omit the step of attaching a separately provided shield member to the rotating member or the like which only needs to support the rotating member.

Further, in order to achieve the object of the present invention, a developer processing apparatus includes a rotary container including a rotary shaft rotatably supported on a side wall of the container via a bearing in a container for storing the developer. In the developer processing apparatus having a structure in which a member is provided, and the developer in the storage container is transported by rotation or stirred, a voltage having the same polarity as the charged polarity of the developer is supplied to the rotating shaft. I do. For example, as shown in FIG. 11, a voltage having the same polarity as that of the developer is applied to the rotating shaft (50) constituting the rotating member (5) by the brush (1).
The power is supplied from the power supply circuit (17) via 6). As a result, the developer repels the rotating shaft (50), so that it is possible to prevent the developer from adhering to the rotating shaft 50, in particular, the rotating shaft portion near the bearing (52). Therefore, cohesion due to the adhesion of the developer can be eliminated, and the intrusion of the developer into the bearing can be prevented.

Therefore, in the developer processing apparatus having the above-described configuration, the shield member is provided on the inner surface of the side wall of the container that holds the bearing portion that rotatably supports the rotation shaft or on the rotating member side facing the inner surface of the side wall of the container. And a voltage having the same polarity as the charged polarity of the developer is supplied to the shield member. That is, as shown in FIG. 1 or 5, if a voltage having the same polarity as the charged polarity of the developer is supplied to the shield member (11 or 12), the electric force as shown in FIG. 2 or FIG. Lines can be eliminated, and the developer can be effectively prevented from adhering to the rotating shaft along the lines of electric force.

If the voltage supplied to the rotating shaft and the shield member or the like is set to a constant voltage or an alternating voltage in a state where the developer is stable, the rotating shaft of the developer can be more effectively applied to the rotating shaft. Can be prevented from adhering. In particular, if the voltage is an alternating voltage, the developer attached to the rotating shaft is vibrated by the alternating voltage (vibration), and the attached developer is acted on to be separated from the rotating shaft. Can be blocked.

Here, if the developing device is a developing device, a developing bias voltage is supplied when the developing device operates. If a voltage is supplied to the rotating shaft in accordance with this timing, a switching circuit for controlling the supply of the developing bias voltage can be shared, and the circuit configuration can be simplified. Further, at the time when the developing bias voltage is supplied, the developer is stabilized, so that the adhesion of the developer to the rotating shaft can be more effectively prevented, and at the same time, the same effect as the state where the alternating voltage is supplied can be expected. .

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. A first embodiment of the present invention will be described with reference to the drawings shown in FIGS. Particularly, in the developer processing apparatus of the present invention, a description will be given of a rotating member provided in the developing apparatus as an example. In the following description of each embodiment, a developing device will be described as an example. However, the present invention is not limited to the developing device, and can be applied to any part where a developer is transported or stirred.

FIG. 4 is a sectional view showing a state in which the device according to the present invention is applied to a developing device. In this figure,
The structure of the developing device and the support structure of the rotating member according to the present invention will be described.

In FIG. 4, reference numeral 1 denotes a developing device according to the present invention. In particular, the developing device 2 transports and stirs the developer 2 into a resin-molded developing tank 3 constituting a container for storing the developer 2. The stirring and conveying rollers 4 and 5 to be performed and a developing roller 6 for magnetically attracting and conveying the developer 2 supplied by the stirring and conveying roller 5 are rotatably provided. Developing roller 6
As is well known in the art, a cylindrical non-magnetic sleeve is configured to be rotationally driven in the direction of the arrow so as to cover a magnet having a large number of magnetic poles provided on its peripheral surface. Therefore, the developer 2 is attracted to the surface of the sleeve by the magnetic force of the magnet, and is transported along the rotation direction of the sleeve.

The developing roller 6 is provided so that a part thereof is exposed from the opened opening of the developing tank 3, and faces the rotating photoreceptor 10 at the exposed part.
This opposing position is the developing position, and the toner is transferred to the electrostatic latent image by rubbing the developer 2 conveyed by the rotation of the developing roller 6 on the electrostatic latent image formed on the surface of the photoconductor 10. Is attached. In particular, the triboelectrically charged toner is attracted and developed by the electrostatic force of the electrostatic latent image.

Before the developer 2 is conveyed to the developing position where the developer 2 is rubbed against the photoreceptor 10, the excess amount of the developer 2 adsorbed on the developing roller 6 by the doctor blade 7 is adjusted so that the amount of the developer 2 is always constant. It has been removed. The developer 2 removed from the developing roller 6 is again supplied to the stirring and conveying rollers 4 and 5.
Are fed between the agitating and conveying rollers 4 and 5 along the flow plate 8 which is extended to the interval between the rollers.

The developer 2 includes a two-component system composed of a carrier and a toner, and a one-component system composed of only a toner. As the toner only, those having magnetism,
Some are non-magnetic. In the case of a non-magnetic one-component toner, the toner is not attracted to the surface of the developing roller 6 by a magnetic force.
The toner can be conveyed by being attracted to the surface of the developing roller 6 by utilizing frictional charging or the like. In this case, a member such as rubber is often used as the developing roller 6.

According to the above configuration, the developer 2 in the developing tank 3 is sufficiently stirred by the stirring and conveying rollers 4 and 5, and the developer 2 is charged to a predetermined polarity, for example, positive. The charged developer 2 is supplied to the developing roller 6 by the action of the stirring and conveying roller 5, is magnetically attracted to the developing roller 6, and is conveyed to the developing position. On the way, the developer 2 is regulated to a fixed amount by the doctor blade 7 and is conveyed to the developing position. On the other hand, the developer 2 removed by the doctor blade 7 is agitated and conveyed through the flow plate 8. 4
, And is again stirred and transported.

Then, the developer 2 after the development is conveyed into the developing tank 3, is scraped off from the developing roller 6, is stirred by the stirring and conveying rollers 5 and 4, and is again subjected to the development. . In this way, the rotation of the stirring / conveying rollers 4 and 5, which are the rotating members, and the developing roller and the like are caused to cause charging by friction with the developer and the like. In this case, particularly in the developing roller 6, since the cylindrical sleeve is usually made of a conductive metal material, problems such as charging do not occur much.

However, the stirring and conveying rollers 4 and 5 are usually made of resin and have a shaft 40 for rotating.
And 50 are made of a metal material or the like. Therefore, the stirring and conveying rollers 4 and 5 are frictionally charged by being rotationally driven, and the charged potential gradually increases. Thereby, the developing tank 3 which rotatably supports the shafts 40 and 50 is provided.
A developer such as a toner or a carrier is adsorbed to the shafts 40 and 50 near the bearing portion, and the developer gradually enters the bearing portion by rotation. Although a sealing material (V ring 53) is provided to prevent the developer 2 from entering the bearing portion, the developer 2 may also enter the bearing portion beyond the sealing material.

Hereinafter, various embodiments of the present invention that can effectively prevent the above-described intrusion of the developer 2 will be described in order.

(First Embodiment) As an example of the means for preventing the intrusion of the developer according to the present invention, it is configured as shown in FIG. FIG. 1 shows an example of a stirring and conveying roller 5 configured as a rotating member, for example. This configuration is exactly the same in the stirring and conveying roller 4, and the configuration of the present invention described below is applied as it is.

A rotating shaft 50 is fixed to both ends of the stirring and conveying roller 5 which is a rotating member. The rotating shaft 50 is a bearing 52 provided with a ball bearing 51 provided on the side wall 3 a of the developing tank 3. It is supported rotatably. One of the rotating shafts 50 is protruded from the developing tank 3.
A drive gear and the like (not shown) are fixed. In order to prevent the developer 2 from entering the bearing portion 52, a V-ring 53 serving as a sealing material is fixed to the rotating shaft 50. The V-ring 53 prevents the developer 2 from entering by a mechanical press-contact operation to the bearing portion 52, and is provided such that a front end thereof is pressed against the inner surface of the side wall 3 a of the developing tank 3. .

The seal member 3 is made of a material such as rubber, and is fixed to the rotating shaft 50 so as to press against the inner surface of the side habit 3a of the developing tank 3 by its own elastic force. Accordingly, one end of the V-ring 53 rubs against the inner wall of the developing tank 3 due to the rotation of the rotating shaft 50, thereby preventing the developer 2 from entering the bearing 52.

On the other hand, the stirring and conveying roller 5 is composed of a roll portion 5b for holding a large number of blades 5a for stirring and conveying at a constant interval, and the above-described rotary shaft penetrates the roll portion 5b. 50 is fixed. Alternatively, the rotating shaft 50 is fixed to both ends of the roll portion 5b.

The blades 5a are formed in an oval shape (elliptical shape), and are provided so as to be inclined at a predetermined angle. Therefore, when the roller 5 is rotated,
While the developer 2 is transported in a fixed direction by the inclined blades 5a, the developer 2 can be fed in a direction orthogonal to the rotation axis direction. In this case, the elliptical blade 5a is inclined so that the projection surface in the direction of the rotation axis 50 becomes circular.

Therefore, when the developer 2 is stirred by the rotation of the stirring and conveying roller 5, the developer 2 itself is charged by rubbing the inner wall of the developing tank 3, particularly the inner wall such as the side wall 3a, with the developer 2. As shown in FIG. 2, for example, when positively charged, negative charges corresponding to the charged charges are induced on the conductive rotating shaft 50, and the lines of electric force (charges) due to these charges are generated. ) Occurs, and an electric field is generated. The developer 2 is gradually attracted and aggregated so as to be attracted to the lines of electric force. Further, when the developer 2 aggregates around the rotating shaft 50 and the bearing portion 52, the developer 2 easily enters between the rotating shaft 50 and the bearing portion 52, and gradually enters.

In FIG. 2, the developer 2 is shown for convenience of explanation.
Although shown large, it is actually very small, and the rotating shaft 50 rotates between the V-ring 53 and the rotating shaft 50 and between the V-ring 53 and the side wall 3 a of the developing tank 3. It is a size that can be slipped through by doing.

In order to prevent this, as shown in FIG. 1, the inner surface of the side wall 3a of the developing tank 3 which supports the rotating shaft of the stirring and conveying roller 5, which is a rotating member, particularly corresponds to the bearing 52. As described above, the shield member 11 for preventing the adhesion of the developer 2 made of, for example, aluminum or the like, which is a non-charged member or a conductive member, is attached. The shield member 11 shields the electric field as shown in FIG. 2 described above and prevents the developer from adhering to the shaft portion of the rotating shaft 2. The shield member 11 is made of, for example, an aluminum sheet having a diameter of 50 mm and a thickness of 0.2 mm, and shields the lines of electric force generated by the charged electric charge in the developing tank 3 as shown in FIG. Can be. This prevents the developer 2 from aggregating on the bearing portion 52.

The shield member 11 is formed of a non-charging member or a conductive member. For example, as the non-charging member, a resin or the like having conductivity by dispersing carbon can be considered, and a material having electric resistance is particularly preferable.
The conductive member is a conductive substance (conductive metal or the like). For example, as the metal material, there are copper, stainless steel, gold, silver, brass and the like in addition to aluminum. Particularly, in the case of aluminum and the like, aluminum foil and the like are very inexpensive and suitable. That is, it can be easily attached to the side wall 3a of the developing tank 3 with a double-sided tape or the like.

The developing tank 3 is formed by using an antistatic and persistent resin from which the charged electric charge is rapidly discharged.
Thus, the same effect can be obtained even if the charging of the developing tank 3 is prevented. That is, even if the developing tank 3 is charged by the rotation of the stirring and conveying roller 5 which is a rotating member,
By rapidly discharging the charged charges, the developer 2 can be prevented from entering the bearing portion 52.

In the first embodiment, an example for confirming the effect will be described below.

The bearing 52 on the inner wall of the developing tank 3 of the developing device 1
A shield member 11 having the shape shown in FIG. The shield member 11 is made of an aluminum sheet having a diameter of 50 mm and a thickness of 0.2 mm.

Then, when the effect was confirmed, it was confirmed that the bearing portion 5 of the developer 2 was maintained even when the operation was continued for 100 hours or more.
No intrusion into the contact portion between 2 and the rotating shaft 50 was confirmed. Normally, the developing device 1 operates during the image forming operation, and the stirring and conveying rollers 4 and 5 are rotationally driven. When the image forming operation is completed, the operation is stopped accordingly, and the rotation of the stirring and conveying rollers 4 and 5 also stops. For this reason, in an image forming apparatus, continuous operation for 100 hours is generally not considered. However, even in such a severe operation, the use of the apparatus according to the present invention can prevent the intrusion of the developer 2, especially the toner. Was.

(Second Embodiment) In the above-described embodiment, the case where the developer tank 3 is charged by friction with the developer 2 or the like and the developer 2 is prevented from entering the bearing portion is described. The stirring and conveying roller 4 which is a rotating member is not limited to this.
And 5 may be charged due to friction with the developer 2 if the resin is molded. Therefore, in this case, the present embodiment is intended to eliminate the influence of the electric field generated by the charged electric charge and to prevent the developer 2 from entering the bearing portion of the rotating member.

FIG. 6 shows a state in which the stirring and conveying rollers 4 and 5 are charged. The stirring and conveying roller 4 or 5 is formed by resin molding, and is charged to, for example, a positive electrode by friction with the developer 2. A negative charge is induced on the rotating shaft 52 by the electric field generated from the positive charge of the charged stirring and conveying roller 7 to be charged. Therefore, for example, the developer 2, particularly the toner, charged to the positive electrode is attracted to the periphery of the bearing portion 52 of the rotating shaft 50, and aggregation occurs. Accordingly, a state is created in which the developer 2 enters the bearing portion 52.

Therefore, as shown in FIG. 5, the stirring blade 5a and the bearing 52, which are closest to the end portion, particularly the side wall 3a of the developing tank 3, are provided.
And a shield member 12 made of a non-charged member or a conductive member. The shield member 12 is fixed to a portion of the roll 5b of the rotating stirring and conveying roller 5.

By providing such an adhesion preventing member 12, it is possible to shield the lines of electric force from the charged blades 5a, particularly from the endmost blades 5a. This can prevent the developer 2 from adhering to the rotating shaft 50, particularly around the bearing 52, and preventing aggregation.

Similarly, in this embodiment, an example for confirming the effect of the present invention will be described below.

As shown in FIG. 5, a shield member 12 is formed between the resin blade 5a of the stirring and conveying roller 5 and the inner wall of the developing tank 3 of the developing device 1 in the shape shown in FIG. An aluminum disk having a radius (distance from the center of the rotating shaft 50 to the outer periphery of the shield member) d of 25 mm and a thickness of 1 mm was provided. It should be noted that as shown in FIG.
Is larger than the projected area in the direction of the rotation axis 50 of the blade 5a of the stirring and conveying roller 5,
The configuration is such that the electric field generated by the blades 5a of the stirring and conveying roller 5 can be sufficiently shielded.

The diameter of the rotating shaft 50 for rotating the stirring and conveying roller 5 was 8 mm, and the distance a between the inner wall surface of the developing tank 3 and the shield member 12 made of an aluminum disk was 15 mm. When the stirring and conveying roller 5 was rotated at 250 revolutions per minute, the blade 5a of the resin-formed stirring and conveying roller 5 had a surface potential of 3000 V or more. Nevertheless, there is no adhesion of the developer to the aluminum disk (shield member 12) and the rotating shaft 50 of the stirring and conveying roller near the inner wall surface of the side wall 3a of the developing tank 3, and the developer 2, especially the toner, No intrusion was observed. Even if this operation was continued for 100 hours or more, no intrusion of the developer 2 into the bearing portion 52 was confirmed.

As shown in FIG. 5, the radius d of the aluminum disk-shaped adhesion preventing member 12 is
Is larger than the distance a between the inner wall surface of the roller and the aluminum disk, so that the blade 5
It is possible to prevent the electric field due to a from reaching. This utilizes the well-known point that "the electric field outside the gauge does not reach inside the Faraday gauge".

(Third Embodiment) In the above-described embodiment, when the developing tank 3 is charged by friction with the developer 2 or the like, or when the resin portion of the stirring and conveying roller 5 is charged with the developer 2 This is an example in which the developer 2 is prevented from entering the bearing portion. Therefore, even when both are charged, the purpose and effect can be sufficiently achieved by taking at least one of the means.

Therefore, in this embodiment, when both are charged, especially the stirring and conveying roller 5 and the developing tank 3 are formed of resin, and the rotating shaft 50 of the stirring and conveying roller 5 is made of a material such as metal. Is the case. In such a configuration, an embodiment of the following configuration will be described in order to further enhance the effect. A specific example is shown in FIG. 7 and will be described below.

As shown in FIG. 7, in this embodiment, both the shield members 11 and 12 described in the first and second embodiments are provided. As a result, even if the developing tank 3 and the stirring and conveying roller 5 are charged and the rotating shaft 50 is charged to the opposite polarity, the electric field generated by these charged charges is shielded by the shield members 11 and 12,
The developer 2 can be reliably prevented from entering the bearing portion 52.

Therefore, as a confirmation of the effect of this embodiment, an actual example implemented in the following form will be shown. The effect was also confirmed in the second embodiment at the same time.

A shield member 12 is provided between the blade 5 a at the end of the stirring and conveying roller 5 and the inner wall surface of the developing tank 3 of the developing device 1.
The shield member 12 was formed into an aluminum disk shape having a diameter of 50 mm and a thickness of 1 mm in the shape shown in FIG. 3A so as to cover the inner wall surface of the side wall 3a of the developing tank 3 of the developing device 1, in particular, the periphery of the bearing portion 52.
An aluminum sheet-shaped shield member 11 having a diameter of 50 mm and a thickness of 0.2 mm in the shape shown in FIG.

As a result, even when the continuous operation of the stirring and conveying roller 5 is continuously performed for 100 hours or more, especially when the stirring and conveying roller 5 is continuously operated, the contact portion between the rotating shaft 50 of the stirring and conveying roller 5 and the bearing portion 52 can be obtained.
That is, no intrusion of the developer 2 during that period was confirmed.

In another embodiment, as shown in FIG. 3B, an aluminum disk having a shape of the shield member 12 and a diameter of 50 mm and a thickness of 1 mm was used. And 1-10m in diameter
shield member 12 provided with a large number of developer passage holes 13
Is installed between the blade 5a of the stirring and conveying roller 5 and the side wall 3a of the developing tank 3 of the developing device 1 as in the second embodiment (the configuration of FIG. 5) and other embodiments (the configuration of FIG. 7). . In this case, the shield member 11 in the other embodiments is the same as described above.

As a result, no intrusion of the developer 2 into the bearing portion 52 was observed even when the stirring and conveying roller 5 of the developing device 1 was operated for 100 hours or more. 3B, the developer 2 existing between the shield member 12 and the side wall 3a of the developing tank 3 is moved in the direction of the rotation axis 50, in particular, the developing tank. 3 can be conveyed through the passage hole 13 toward the center. Therefore, it is possible to prevent the developer 2 from staying between the shield member 12 and the side wall 3a of the developing tank 3.

This is because the developer 2 is supplied to the bearing 5 of the rotating shaft 50.
This prevents the developer 2 from being pressed toward the second side, thereby promoting the effect of preventing the developer 2 from entering the bearing portion. As a result, the developer on the side wall 3a of the developing tank 3 of the agitating / conveying roller 5 can be effectively circulated and conveyed, and the synergistic effect with the shield member for shielding the electric field can prevent the developer 2 from entering the bearing portion. Increase.

Further, as another example, an aluminum spiral disk having a shape shown in FIG. 3C and a maximum diameter of 50 mm and a thickness of 1 mm was described in the second embodiment and other embodiments. Further, a shield member 12 was provided between the blade 5a of the stirring and conveying roller 5 and the inner wall surface of the developing tank 3 of the developing device 1. In this case, a spiral disk in which the occupied area ratio of the conductive portion of the shield member 12 was 50% was used. As a result, no intrusion of the developer 2 into the bearing portion 52 of the developer 2 was confirmed even when the developing device 1 was operated for continuous 100 hours or more.

The shield member 12 having the structure shown in FIG.
In the same manner as in the shield member having the structure shown in FIG.
The stagnation of the developer 2 between the shield member 12 and the side wall 3a of the developing tank 3 is prevented, and the circulating conveyance of the developer 2 can be effectively performed.

Further, as shown in FIG. 8, a shield member 12 shown as another embodiment has a diameter of 50 m.
m, an L-shaped notch is provided at every 90 ° in the peripheral portion of an aluminum disk having a thickness of 1 mm,
It was cut and raised to about 0 ° to form the transport blade 15 of the developer 2. The shield member 12 is fixed to the stirring and conveying roller 5 so that the stirring blade 15 faces the side wall 3a of the developing tank 3, and the developer 2 is moved in the opposite direction to the side wall 3a of the developing tank 3.
In particular, the developer was fed to the center of the developing tank 3. The result of providing the shield 12 having such a structure and shape in the same manner as in the second embodiment and other embodiments is that the bearing of the developer 2 is maintained even when the developing device 1 is operated for 100 hours or more continuously. No intrusion into the part 52 was confirmed.

In the shield member 12 shown in FIG. 8, with respect to the developer 2 entering between the shield member 12 and the side wall 3a of the developing tank 3, the developer 2 is positively moved by the action of the transport blade 15. The developer 2 is sent in the opposite direction, so that the circulating conveyance is performed more efficiently without the developer 2 staying at the end. Here, the shield member 12 shown in FIG. 8 may be attached to the stirring / conveying roller 5 so as to be rotated in the counterclockwise direction when the conveying blade 15 is folded up to the near side. That is, the transport wing 15 is
When the developer 2 is provided so as to be positioned on the side wall 3a side, the developer 2 on the side wall 3a side is gradually sent out toward the blade 5a side along the inclined surface of the bent transport blade 15.

(Fourth Embodiment) FIG. 9 shows an example of a fourth embodiment according to the present invention. this is,
An aluminum shield member 12 is fixed to a rotating shaft 50 of a conductive stirring and conveying roller 5 made of metal.
0 and the shield member 12 are electrically connected. And
Connect one end of the rotating shaft 50 of the stirring and conveying roller 5 to the conductive brush 1
6 and ground. By grounding the conductive shield member 12 in this manner, the effect of shielding the electric field can be enhanced, and the effect of preventing the developer 2 from entering the bearing portion 52 can be promoted. Also in this embodiment, the same effect can be obtained by forming the shield member 12 as shown in FIG.

The sheet-shaped shield member 11 made of aluminum or the like shown in the first embodiment may be grounded in the same manner. In this example, the shield member 1
1 may be configured to be in electrical contact with the rotating shaft 50, and the rotating shaft 50 may be grounded in the same manner.

Further, as shown in FIG.
Between the blade 5a of the stirring / conveying roller 5 and the side wall 3a of the developing tank 3 which are closest to the inner surface of the side wall 3a of the developing tank 3 of the circular blade 5c formed of resin in a circular shape instead of an ellipse.
Shield member 1 provided by coating a plating layer
8 is formed. Even with such a configuration, it is possible to eliminate the influence of the electric field generated by the charged charges, and similarly to prevent the developer 2 from entering the bearing portion 52 of the developer 2. Also, the shield member 18 in which a plating layer is similarly coated on the surface of the blade 5a closest to the bearing portion 52, which faces the side wall 3a of the developing tank 3, is used instead of the circular blade. May be provided. As this plating layer, a thin film such as an aluminum sheet may be attached.

Further, in a screw roller provided with a spiral stirring / conveying blade in a rotating roll portion instead of the stirring / conveying roller 5, a conductive member is provided on the screw blade portion closest to the side wall 3 a of the developing tank 3. What is necessary is just to coat the shield member 18 which consists of.

(Another Embodiment) In the first to fourth embodiments described above, for example, as shown in FIG. 1 and FIG. The developer is prevented from adhering and coagulating, and the rotating shaft 5
Thus, the intrusion of the developer into the zero bearing portion 52 is prevented.

On the other hand, in this embodiment, without providing the shield members 11 and 12, etc., the adhesion to the rotating shaft 50 is prevented, the aggregation of the developer is prevented, and the bearing portion 52 is provided as described above. Of the developer is efficiently prevented.

(First Example) FIG. 11 shows an example. In the figure, a predetermined voltage from a power supply circuit 17 is supplied to one end of the rotating shaft 50 via a conductive brush 16. Other configurations are the same as those described in FIG. 1 and are denoted by the same reference numerals.

The power supply circuit 17 supplies a voltage having the same polarity as that of the particularly charged toner of the developer 2 to the rotating shaft 50. For example, if the charging polarity of the developer 2 is positive, a positive voltage is supplied to the rotating shaft 50.

Therefore, the developing tank 3 made of resin or the like is
For example, the developer is charged to a positive polarity by stirring the developer or the like. The electric field generated by the charged charges in the developing tank 3 causes the rotating shaft 5 to rotate.
In the case of 0, as shown in FIG. 2, a negative charge is drawn and negatively charged. As a result, the positively charged toner of the developer 2 is attracted to the rotating shaft 50 by the electric charges as shown in FIG. Therefore, the toner tends to enter between the bearing 52 and the rotating shaft 50.

On the other hand, as shown in FIG. 11, a voltage having the same polarity as the polarity of the developer 2 charged on the rotating shaft 50, particularly the same polarity as the charged polarity of the toner, is supplied from the power supply circuit 17. 2 is prevented from adhering to the rotating shaft 50. Particularly, the adhesion of the developer 2 to the conductive portion supported by the bearing 52 is prevented. Therefore, toner aggregation can be prevented, and intrusion of the developer 2 into the bearing portion 52 can be effectively prevented.

The embodiment will be described below.
Since the potential at which a is charged becomes about 3000 V,
The voltage value supplied to the rotating shaft 50 by the power supply circuit 17 was set to about +1500 to 3000V.

Then, the stirring and conveying rollers 4 in the developing tank 3
It was confirmed that the developer 2 did not intrude between the bearing portion 52 of the developer 2 and the rotating shaft 50 even when 5 and the like were driven continuously for 100 hours or more.

(Second Example) Further, as shown in FIG. 2, when the side wall 3a supporting the rotating shaft 50 of the developing tank 3 is charged, electric lines of electric force are formed between the developing device 3 and the rotating shaft 50. Along with this, an example for more effectively preventing the developer 2 from adhering will be described below.

As shown in FIG. 1, a conductive shield member 11 is provided on the inner surface of the side wall 3a for supporting the rotating shaft 50. A voltage having the same polarity as the charged polarity of the developer 2 is supplied to the shield member 11 as well as the rotating shaft 50. In this case, similarly to the rotating shaft 50, the same polarity and the same voltage value are supplied from the power supply circuit 17 to the shield member 11.

Therefore, the rotation shaft 50 and the shield member 11
Since the developer 2 has the same voltage and the same polarity, the developer 2 is repelled from the rotating shaft 50 without generating lines of electric force, and is prevented from adhering to the rotating shaft 50.

In the second example, an embodiment for confirming the effect will be described below. This embodiment has the same conditions as the embodiment described in the first embodiment, and supplies the same polarity and the same voltage as the charging voltage of the developer 2 from the power supply circuit 17 to the rotating shaft 50 and the shield member 11. I made it.

When the effect of this embodiment was confirmed,
The stirring and conveying rollers 4 and 5 are rotated so that the bearing 52 and the rotating shaft 50 of the developer 2 can be operated for 100 hours or more of continuous operation.
No intrusion into the area of contact with was found.

(Third Example) Next, an example for preventing the inconvenience as shown in FIG. 6 will be described below. That is, in FIG. 6, when the blade 5 a or the like, which is a rotating member, is charged, electric lines of force are generated between the blade 5 a and the rotating shaft 50, thereby causing the developer 2 to adhere to the rotating shaft 50. Then, aggregation of the developer 2 occurs.

In order to prevent this, as described in the first example, a voltage having the same polarity as the charged polarity of the developer 2 may be supplied to the rotating shaft 50 shown in FIG. That is, the rotating shaft 5
The developer that is going to adhere to the bearing portion 52 is repelled, and the bearing portion 52
Aggregation of the developer in the vicinity can be eliminated.

Therefore, in order to more efficiently solve the inconvenience shown in FIG. 6, as shown in FIG.
A conductive shield member 12 is provided between the blade 5a and the bearing 52 at the extreme end of the power supply circuit 17, and a voltage having the same polarity as the charged polarity of the developer is supplied to the shield member 12 from the power supply circuit 17. In this case, the same voltage is naturally supplied to the rotating shaft 50.

By doing so, the lines of electric force as shown in FIG. 6 do not occur between the blade 5a and the rotating shaft 50 (especially near the bearing portion 52), and the developer near the bearing portion 52 Can be eliminated. Further, since the voltage having the same polarity and value as that of the shield member 12 is simultaneously supplied to the rotating shaft 50, the developer 2 is repelled, and the rotating shaft 5 of the developer 2 is repelled.
Adhesion to zero is prevented.

Here, regarding the shield member 12,
As shown in FIG. 9, the shield member 12 is directly fixed to the conductive rotating shaft 50, and a predetermined voltage is applied from the power supply circuit 17 shown in FIG. If you supply a voltage of polarity,
It is not necessary to individually supply voltage to the shield member 12 and the rotating shaft 50.

Therefore, in order to confirm the effect of the third example, an example will be described below. In this example, the same conditions as in the example described in the second embodiment, particularly, the shield member 12 were provided, and the shape and conditions were the same. All were the same except that a voltage having the same polarity as the charging polarity of the developer 2 was supplied to the shield member 12 and the rotating shaft 50.

When the effect of this embodiment was confirmed,
The stirring and conveying rollers 4 and 5 are rotated so that the bearing 52 and the rotating shaft 50 of the developer 2 can be operated for 100 hours or more of continuous operation.
No intrusion into the area of contact with was found. In particular, by rotating the stirring and conveying roller 5 at 250 revolutions per minute, the aggregation of the developer 2 on the rotating shaft 50 cannot be confirmed even though the blade 5a has a surface potential of 3000 V or more. The developer 2 did not enter the portion 52.

As described in the description of the second embodiment, as the shield member 12, FIG.
And a radius d of which is determined by the relation of a distance d between the shield member 12 and the side wall 3a.
By setting a, the effect is further enhanced.

(Fourth Example) An example in which the shield members 11 and 12 are provided as shown in FIG. 7 will be described below. That is, as shown in FIG.
A voltage having the same polarity as the charged polarity of the developer 2 is supplied to the shield members 11 and 12 and the rotating shaft 50 from the power supply circuit 17 shown in FIG. With such a configuration, especially the bearing portion 52 of the rotating shaft 50 is provided.
Adhesion and aggregation of the developer 2 in the vicinity can be more effectively prevented.

In order to confirm the effect of the fourth example, an example will be described below. This example has the same conditions as those of the example described in the third embodiment, in particular, the shielding member 11.
And 12 were provided, and their shapes and conditions were made the same. All were the same except that a voltage having the same polarity as the charging polarity of the developer 2 was supplied to the shield members 11 and 12 and the rotating shaft 50.

When the effect of this embodiment was confirmed,
The stirring and conveying rollers 4 and 5 are rotated so that the bearing 52 and the rotating shaft 50 of the developer 2 can be operated for 100 hours or more of continuous operation.
No intrusion into the area of contact with was found.

(Configuration Example of Power Supply Circuit 17) Here, the power supply circuit 17 used in the first to fourth examples in another embodiment supplies a voltage as shown in FIGS. 12 (a) to 12 (d). It is supposed to.

That is, in FIG. 12A, a constant voltage is supplied from the power supply circuit 17 from the time when the developing device operates. In this case, the power supply circuit 17 is configured by a constant voltage circuit.

FIG. 12B shows a state where the developing device operates, and in particular, when the developer 2 is stabilized by the rotation of the stirring and conveying rollers 4 and 5, for example, when the charge amount of the developer 2 is saturated, the constant voltage is applied. Are supplied from the power supply circuit 17. The voltage is controlled so as to gradually increase during a period until the voltage is saturated. Without doing so, at the time of saturation, that is, at the time when the stirring and conveying rollers 4 and 5, which are rotating members, are driven for a certain period of time,
A constant voltage may be supplied.

This is because when the stirring and conveying rollers 4, 5 and the like are not rotating in the developing device, the developer 2, for example, the toner, is not charged or the charge amount is low and unstable. It is not advisable to supply a constant voltage at this point. It is possible that toner scattering occurs.

FIG. 12C shows that, when the charge amount of the developer 2 is stable, a constant voltage is not output from the power supply circuit 17 but is ON (high potential) -OFF at a constant cycle.
It outputs an alternating voltage (pulse voltage) that switches to (zero potential). By doing so, the effect of preventing the developer 2 from adhering to the rotating shaft 50, particularly near the bearing 52, is enhanced.

This is because the alternating voltage is at least 50
Is supplied to the developer 2, the developer 2, which adheres to the rotation shaft 50,
For example, vibration (vibration) can be applied to the toner,
The toner and the like adhering to the rotating shaft 50 are more easily separated from the rotating shaft 50. Therefore, the effect of preventing the toner from adhering to the rotation shaft 50 increases. The cycle of the alternating voltage at this time may be arbitrarily determined.

Therefore, the power supply circuit 17 for obtaining a pulsed alternating voltage as shown in FIG. 12 (c) requires an oscillator or the like to be separately provided for switching processing, and the circuit configuration tends to be complicated. Therefore, a sufficient effect can be expected even if a voltage obtained by half-wave rectifying the AC voltage is output. FIG. 13 shows an example of the power supply circuit 17.

That is, using a 100 V commercial AC voltage 19 and using a high-voltage transformer 20 or the like,
The voltage is boosted to about 0 V, and a positive half-wave voltage obtained through the rectifier 21 is output. This output is supplied to the rotating shaft 50 and the like via the conductive brush 16. As a result, the alternating voltage is supplied to the rotating shaft 50, and the adhesion of the developer 2 can be prevented, and the intrusion into the bearing portion 52 can be effectively prevented.
Therefore, according to the circuit configuration of the power supply circuit 17 shown in FIG. 13, there is no need to provide an oscillator, switching means, and the like, and the circuit becomes very simple.

Further, the developing device performs
The stirring and conveying rollers 4 and 5 are rotated beforehand to sufficiently stir the developer 2 to saturate the charge amount, that is, to maintain a stable state to perform development. At this time, a developing bias voltage is supplied to the developing roller 6 at the timing of performing the developing. A pulse voltage may be output from the power supply circuit 17 in accordance with the timing at which the developing bias is supplied. As shown in FIG. 12D, a pulse voltage can be output from the power supply circuit 17 in accordance with the supply timing of the developing bias voltage. By doing so, the power supply circuit 17 can share a switching circuit and the like for the supply circuit of the developing bias voltage, and can simplify the circuit configuration.

Therefore, as shown in FIG. 12D, the pulse voltage is applied from the power supply circuit 17 to the rotating shaft 50 and the like, so that the developer 2
Can always be supplied at a stable timing. This increases the effect of preventing the developer 2 from adhering to the rotating shaft 50. In addition, since the alternating voltage is actually supplied, the effect of preventing the developer 2 from adhering is enhanced.

In the description of each of the above embodiments, the stirring and conveying roller 5 in the developing device 1 has been described as an example. However, the stirring and conveying roller 4 can be implemented by a similar mechanism and structure. In addition, the portion supporting the rotating member by the stirring and conveying roller 5 has been described at one end, but a mechanism having the same structure is provided at the other end facing the portion. However, only one rotation shaft 50 is provided, and only the voltage from the power supply circuit 17 is supplied to the rotation shaft 50 from one side.

As the rotating member, a large number of elliptical blades 5a for stirring and conveying are inclined in the stirring and conveying roller 5, but screw blades provided in a spiral state on the surface of a rotating roll or the like are provided. The same applies to screw rollers. In other words, the shield member 12 is located at the end of the screw roller, particularly at a portion near the side wall 3a of the developing tank 3.
Or the shield member 11 may be provided on the inner wall surface of the side wall 3 a of the developing tank 3.

The present invention can be applied not only to the developing device 1 described above, but also to a general developer processing device for processing the developer 2. For example, in a cleaning device, a developer is conveyed to a collection container by a screw roller that is a collection member provided in a portion that stores the removed developer. Even in the developer processing apparatus having such a configuration, the intended effect can be obtained by directly applying the mechanism according to the present invention. Of course, the screw roller may utilize the structure of the stirring and conveying roller 5 shown in the embodiment of the present invention.

Further, in the developer replenishing apparatus for replenishing or replenishing the developer 2 with the developer tank 3, the agitating and conveying roller 5 which is a rotating member described in the embodiment of the present invention for agitating and transporting the developer 2 is also used. The object and effects of the present invention can be achieved by applying the mechanism of the present invention to this member as described above.

In particular, the present invention effectively prevents a developer from entering a portion supporting a rotating member in a developer processing apparatus having a structure in which a rotating member is rotatably provided in a container for storing a developer or the like. Can be stopped.

[0112]

According to the apparatus of the present invention, it is possible to effectively prevent the developer from entering the supporting portion by the electric field generated by the electric charge of the rotating member and other containers accommodating the developer due to the rotation of the rotating member. it can.

In particular, in the present invention, the influence of the electric field generated by the above-mentioned charged charges is eliminated by a simple structure in which only the shield member is provided, so that the developer can be prevented from entering the supporting portion.

Further, according to the apparatus of the present invention, by supplying the rotating shaft itself with a voltage having the same curvature as the polarity with which the developer is charged, it is possible to prevent the developer from adhering to the rotating shaft, and thus Can be effectively prevented from entering at the support portion.

Further, by making the voltage supplied to the rotating shaft an alternating voltage, the effect of preventing the adhesion of the developer is enhanced, and the effect of preventing the intrusion is promoted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a portion of a developing device according to the present invention that supports a rotating member of a developer, in which a developer is prevented from entering a supporting portion of the rotating member (first embodiment). FIG.

FIG. 2 is a cross-sectional view illustrating a state in which a developer enters a support portion when the embodiment in FIG. 1 is not applied.

FIG. 3 is a plan view showing various structures of a shield member for preventing intrusion of a developer in the present invention.

FIG. 4 is a sectional view showing an example of the structure of the developing device according to the present invention.

FIG. 5 is a cross-sectional view illustrating a second embodiment of the present invention for preventing a developer from entering a support portion.

FIG. 6 is a plan view showing a state in which a developer enters a support portion when the embodiment in FIG. 4 is not applied.

FIG. 7 is a cross-sectional view showing a third embodiment of the present invention for preventing a developer from entering a support portion.

FIGS. 8A and 8B are diagrams showing another structure of a shield member for preventing intrusion of a developer in the present invention, wherein FIG. 8A is a plan view and FIG. 8B is a side view thereof.

FIG. 9 is a cross-sectional view showing a fourth embodiment of the present invention for preventing a developer from entering a support portion.

FIG. 10 is a cross-sectional view showing a further embodiment of the present invention for preventing a developer from entering a support portion.

FIG. 11 is a cross-sectional view showing another embodiment for preventing a developer from entering a support member of the present invention.

12 shows a waveform of a voltage supplied by the power supply circuit according to another embodiment shown in FIG. 11,
(A) shows a constant voltage state, (b) shows a constant voltage state supplied when the charged state of the developer is stabilized, (c) shows an alternating voltage state, and (d) shows a developing bias voltage supply timing. It is a waveform diagram which shows the state which made it correspond.

FIG. 13 is a circuit diagram showing one configuration example for obtaining an alternating voltage by the power supply circuit of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 developing device (developer processing device) 2 developer 3 developing tank 3 a developing tank wall 4 stirring and conveying roller (rotating member) 5 stirring and conveying roller (rotating member) 5 a stirring and conveying blade 5 b rotating roll 5 c conveying blade 50 Rotating shaft 51 Ball bearing 52 Bearing 6 Developing roller 10 Photoreceptor 11 Shielding member 12 Shielding member 13 Passing hole 15 Conveyor blade 16 Conductive brush (grounding member) 17 Power supply circuit 18 Shielding member (conductive coating tank) 19 AC power supply 20 High voltage transformer 21 Rectifier

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Miyaji 22-22, Nagaike-cho, Abeno-ku, Osaka City, Osaka Inside (72) Inventor Shigeru Yamaguchi 22-22, Nagaike-cho, Abeno-ku, Osaka City, Osaka Inside (72) Inventor 2330 Mizoguchi 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Japan Inside Sharp Corporation (72) Inventor Takao Hiroho 22-22, Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside

Claims (10)

[Claims] 1. A developer processing apparatus having a structure in which a rotatable rotating member is provided in a storage container for storing a developer, and the developer in the storage container is transported or agitated by rotation. A developer processing apparatus, wherein a shield member is provided on the inner wall surface of the storage container of the rotatably provided support portion. 2. A developer processing apparatus having a structure in which a rotatable rotating member is provided in a storage container for storing a developer, and the developer in the storage container is conveyed or agitated by rotation. A developer processing apparatus, wherein a shield member is provided on a rotating member side opposite to a rotatably supported portion. 3. A developer processing apparatus having a structure in which a rotatable rotating member is provided in a storage container for storing a developer, and the developer in the storage container is transported or agitated by rotation. A first shield member is provided on the inner wall surface of the storage container of the rotatably provided support portion, and a second shield member is provided on the side of the rotatable member opposite to the portion rotatably supporting the rotatable member. A developer processing device. 4. The developer processing apparatus according to claim 1, wherein an area of the shield member is larger than a projected area of the rotation member in a rotation axis direction. 5. The shield member is arranged such that the relation of a <d is established when the radius of the shield member is d and the distance between the shield member and the inner wall surface of the developer container is a. 4. The developer processing apparatus according to claim 2, wherein 6. A developer processing apparatus having a structure in which a rotatable rotating member is provided in a storage container for storing a developer, and the developer in the storage container is transported or agitated by rotation. A developer processing apparatus, comprising: a shield member in which a blade or a screw portion that constitutes the rotating member closest to a side wall surface and stirs or conveys the developer is coated with a conductive member. 7. A rotating member including a rotating shaft rotatably supported on a side wall of the container via a bearing portion in a housing container for housing the developer, and rotating the developer in the housing container by rotation. A developer processing apparatus having a structure of transporting or stirring, wherein a voltage having the same polarity as the charged polarity of the developer is supplied to the rotating shaft. 8. A shield member is provided on an inner surface of a side wall of a container for holding a bearing portion rotatably supporting the rotating shaft or on a rotating member facing the inner surface of a side wall of the container, and the shield member is charged with developer. 8. The developer processing apparatus according to claim 7, wherein a voltage having the same polarity as the polarity is supplied. 9. The developer processing apparatus according to claim 7, wherein a constant voltage or an alternating voltage is supplied to the rotating shaft when the developer is in a stable state. 10. The developing device is a developing device,
9. The developer processing apparatus according to claim 7, wherein the voltage supplied to the rotating shaft is supplied in synchronization with a timing of supplying a developing bias voltage.