JPH0895364A - Developing device - Google Patents

Abstract

PURPOSE: To prevent failure caused by residual toner while suppressing the enlargement of the size of a device and the increase of the cost as little as possible by removing toner remaining on a supplying roller supplying the toner to a developing roller with a toner carrying member carrying the toner to the supplying roller. CONSTITUTION: The supplying roller 3 is arranged to come into contact with the developing roller 2 and they are driven to rotate in the directions of the arrows A and B at a circumferential speed ratio. The toner supplying member 4 is arranged to come into contact with the surface of the supplying roller from a screw member for supplying the toner from the toner hopper 9 disposed on one end side of a developing unit to the supplying roller. A second toner carrying member 5 recovering the toner to the toner hopper can be arranged to come into contact with the supplying roller, as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used in an image forming apparatus such as a copying machine, a facsimile, a printer, and more specifically, it carries a developer for developing a latent image on a latent image carrier. A developer carrying member, a developer supplying member for supplying the developer to the developer carrying member, and a developer carrying rotating member for carrying the developer in the longitudinal direction of the developer supplying member in the vicinity of the developer supplying member. The present invention relates to prevention of residual developer on a developer supply member in a developing device equipped with.

[0002]

2. Description of the Related Art Conventionally, a developing device for supplying, for example, a non-magnetic toner as a developer to a surface of a developing roller as a developer carrying member by a supplying roller as a developer supplying member having a surface layer made of a porous elastic member. For the purpose of, for example, reducing the cross-sectional area of the developing device and downsizing the image forming apparatus, a developer conveying rotary member that conveys toner in the longitudinal direction of the supplying roller in the vicinity of the supplying roller. There is known a developing device provided with a transport screw. For example, in Japanese Unexamined Patent Publication No. 5-3134488, the toner is conveyed from a toner storage portion provided on the longitudinal end side of the supply roller into a developing device in which the supply roller and the developing roller are stored, and There is disclosed a developing device provided with a toner-supplying transport screw for uniformly supplying toner to the supply roller in the longitudinal direction of the supply roller. The publication also discloses a developing device in which a toner recovery screw for recovering excess toner in the developing device into the toner storage unit is provided near the supply roller, in addition to the toner supply transport screw. There is.

On the other hand, in the developing device for supplying the toner to the surface of the developing roller by the supply roller, all the toner conveyed to the portion facing the surface of the developing roller by the supply roller is supplied to the surface of the developing roller. Instead, some stick to the surface of the supply roller and continue to rotate. Such toner is excessively charged due to repeated frictional charging between the developing roller and the supply roller, or the toner is newly charged on the surface of the supply roller. Due to the friction, the newly supplied toner may be charged with a polarity opposite to the predetermined polarity. Therefore, stable image density may not be obtained for a long period of time.

Therefore, various developing apparatuses have been proposed which appropriately remove toner from the surface of the supply roller so that the residual toner that continues to adhere to the surface of the supply roller does not occur. For example, in JP-A-62-27773,
It has been proposed that a blade-shaped or brush-shaped developer peeling member that contacts the supply roller is provided to scrape off the residual toner on the supply roller. In addition, Japanese Patent Laid-Open No. 1-276172
In the publication, a toner scraping member made of a porous foaming member such as urethane is provided so as to be in contact with the supply roller, and the residual toner is scraped off by rotationally driving the member.

Further, in Japanese Patent Application Laid-Open No. 4-37778,
A developing device in which the toner supply transport screw is provided in the vicinity of a supply roller, and a developer scraping member that is in contact with or close to a supply roller is provided, and the scraping member has a bias voltage that enhances scraping efficiency. It has been proposed to scrape off the residual toner on the supply roller by applying the above.

[0006]

However, the addition of a dedicated member for removing the residual toner on the supply roller makes it possible to increase the size of the apparatus, increase the number of parts, and structure by securing the space for this dedicated member. However, it is not preferable because it leads to complexity and cost increase. In particular, JP-A-62-27773
When the above-mentioned dedicated member is rotationally driven like the one disclosed in the publication, a dedicated drive device is also required, which is a great disadvantage. The present invention has been made in view of such problems, and an object thereof is to provide a developer carrying member carrying a developer for developing a latent image of a latent image carrying member, and a developer carrying member. A developing device comprising: a developer supply member for supplying a developer to a body; and a developer transport rotating member for transporting the developer in the longitudinal direction of the developer supply member in the vicinity of the developer supply member, It is an object of the present invention to provide a developing device capable of preventing the developer from remaining on the developer supply member while suppressing an increase in the size and cost of the device.

[0007] In Japanese Patent Laid-Open No. 5-3134488, the supply roller is formed of an elastic body and disposed so as to rub against the case of the developing device, so that the toner aggregates on the surface of the supply roller. It is also disclosed to prevent sticking. However, in this configuration, since the sliding surface of the case is usually flat, there is a possibility that toner aggregation and fixation cannot be sufficiently prevented.

[0008]

In order to achieve the above object, a developing device according to a first aspect of the present invention comprises a developer carrying member carrying a developer for developing a latent image on the latent image carrying member, and the developing device. In a developing device including a developer supply member for supplying a developer to a developer carrying member, and a developer conveying rotation member for conveying the developer in the longitudinal direction of the developer supply member in the vicinity of the developer supply member. The developer conveying rotary member is arranged so as to come into contact with the surface of the developer supply member. Here, the rotary member for transporting the developer may be a rotary member for feeding which uniformly transports the developer from the developer accommodating portion to the vicinity of the developer supplying member in the longitudinal direction thereof, or a developer carrying member. The excess developer in the developing device accommodating the developer supplying member may be a rotating member for recovery for recovering and conveying to the developer accommodating device. Further, it is a rotating member for conveying the developer in the opposite direction to the supply rotating member and delivering the developer to the end portion of the supply rotating member to circulate the developer in the developing device. May be.

According to a second aspect of the present invention, in the developing device according to the first aspect, a scraping portion for scraping off the developer adhering to the surface of the developer supply member is provided on the outer peripheral portion of the developer transporting rotary member. And the developer transporting rotary member is arranged so that the scraped portion contacts the surface of the developer supply member. Here, for example, when a transport screw is used as the developer transport rotary member, the scraped-off portion can be formed by making the outer peripheral end surface of the spiral blade a surface having a certain width. Further, a toner scraping member may be fixedly formed on the outer peripheral portion of the developer carrying rotating member. As the toner scraping member, a rod-shaped member extending in the longitudinal direction of the developer transporting rotary member, a cylindrical member that covers the periphery of the developer transporting rotary member, and has a hole for passing the developer is formed. Can be used.

A developing device according to a third aspect of the present invention is the developing device according to the second aspect, wherein a screw member is used as the rotary member for transporting the developer, and the outer peripheral end surface of the blade portion of the screw member is sandblasted to scrape it off. It is characterized in that a part is formed.

According to a fourth aspect of the present invention, in the developing apparatus according to the first or second aspect, the portion of the rotary member for transporting the developer that comes into contact with the surface of the developer supply member is made to have a predetermined polarity by friction. It is characterized by being formed of a material that can be charged. Here, as the material, a resin or the like that charges the developer to a predetermined polarity by friction can be used.

According to a fifth aspect of the present invention, there is provided the developing device according to the first or second aspect, wherein the developer supplying member is capable of charging the developer to a predetermined polarity by friction. It is characterized in that the portion in contact with the surface of the developer supply member is formed of the same material as the developer or a material substantially the same as the developer in the triboelectric series. For example, the contact portion is formed by applying the same material as the developer.

A developing device according to a sixth aspect of the present invention includes a developer carrying member carrying a developer for developing a latent image on the latent image carrying member, and a developer supplying member for supplying the developer to the developer carrying member. A developing device provided with a developer transporting rotary member for transporting the developer in the longitudinal direction of the developer supply member in the vicinity of the developer supply member, so as to come into contact with or approach the surface of the developer supply member. The developer transport rotary member, and between the developer supply member and the developer transport rotary member, the charged developer adhering to the surface of the developer supply member is developed. An electric field generating means for generating an electric field to be transferred to the agent transporting rotary member is provided.

In the developing device according to any one of the first to fifth aspects, the surface of the developer supplying member is rubbed by the rotating member for conveying the developer rotating at a position where it comes into contact with the surface of the developer supplying member, The remaining developer that has adhered is mechanically peeled off. Then, at least a part of the peeled developer is conveyed in a predetermined direction by the developer conveying rotating member as it is.

According to another aspect of the developing device of the present invention, there is developed by an electric field formed by the electric field generating means between the developer feeding rotary member which is in contact with or close to the surface of the developer feeding member and the developer feeding member. The residual developer on the surface of the developer supplying member is transferred to the developer conveying rotary member to be removed from the surface of the developer supplying member and adhered to the surface of the developer conveying rotary member. Then, the developer attached to the surface of the developer transporting rotary member is directly transported in the predetermined direction by the developer transporting rotary member.

[0015]

According to the developing device of the present invention, by disposing the rotary member for transporting the developer at a position in contact with the surface of the developer supplying member, the rotary member for conveying the developer remains on the surface of the developer supplying member. Since it has a function to remove the developer,
As compared with a case where a dedicated member is additionally provided to remove the residual developer, it is possible to suppress the size increase and cost increase of the apparatus. Further, since at least a part of the remaining amount of the developer removed from the surface of the developer supply member can be conveyed as it is in the predetermined direction by the developer conveying rotary member, the developer conveyer and the toner can be conveyed by the developer conveying rotary member. At least a part of the removed residual developer can be taken in between the accommodating portion or the developer circulation path formed in the developing device. Therefore, it is possible to suppress the residual developer removed above from locally staying in the developing device or the like.

Particularly, according to the developing device of the second or third aspect, the scraping portion for scraping off the developer formed on the surface of the rotary member for transporting the developer is brought into contact with the surface of the developer supplying member. Since the remaining amount of toner adhering to the surface is mechanically peeled off, the developer carrying rotating member, which is mainly shaped for carrying, is simply contacted with the surface of the developer supplying member. It is possible to remove the residual developer satisfactorily with less uneven stripping as compared with the case where the residual developer is disposed.

Further, according to the developing device of claim 3, the outer peripheral end face of the blade portion of the screw member as the developer conveying rotary member is subjected to sandblasting so that the residual developer is peeled off due to catching. Since the number of screws is increased as compared with the normal screw member, the developer can be removed well as compared with the case where the normal screw member is simply arranged so as to contact the surface of the developer supply member. You can Moreover, the performance of removing the developer can be improved by the inexpensive processing such as sandblasting.

In particular, according to the developing device of claim 4,
When a portion of the developer transporting rotary member formed of a predetermined material comes into contact with the surface of the developer supply member, the developer is frictionally charged to a predetermined polarity, and the developer is charged by the counter charge. Is electrostatically attracted, so that the performance of removing the residual developer from the surface of the developer supply member can be improved.

In particular, according to the developing device of claim 5,
The portion of the rotary member for transporting the developer that comes into contact with the surface of the developer supplying member is made of the same material as the developer or a material substantially the same as the developer in the triboelectrification series. The developer attached to the surface of the member is not charged up by friction. Therefore, unlike the case where such charge-up occurs, the developer is charged to a predetermined polarity by friction, and the developer supply member surface that electrostatically attracts the developer by the counter charge of the charge, It is possible to prevent the removal performance of the residual developer from being deteriorated by increasing the suction force with the developer.

According to the developing device of the sixth aspect, a predetermined electric field is generated between the developer conveying rotary member and the developer supplying member which are arranged at the predetermined positions, so that the developer conveying rotary member is caused to generate a predetermined electric field. Since it has a function to remove the residual developer from the surface of the developer supply member, the size and cost of the device are increased compared to the case where a dedicated member is added to remove the residual developer. Can be suppressed. Also,
The remaining amount of the developer removed from the surface of the developer supply member and attached to the developer transport rotary member can be directly transported in a predetermined direction by the developer transport rotary member, so that the developer transport rotary member transports it. Between the developing unit and the toner storage unit,
Alternatively, at least a part of the removed residual developer can be taken into the developer circulation path formed in the developing device. Therefore, it is possible to suppress the residual developer removed above from locally staying in the developing device or the like. (Hereafter, margin)

[0021]

EXAMPLES Examples in which the present invention is applied to a developing device using a non-magnetic one-component toner used in an electrophotographic copying machine will be described below. 1A is a schematic configuration diagram of a developing device in the developing device according to the present embodiment, FIG. 1B is a perspective view of the developing device, and FIG. 1C is a side sectional view of the developing device. The developing device casing 1 is provided with an opening 1a. A developing roller 2 as a developing carrier is arranged in the opening 1a so as to face a photosensitive member as a latent image carrier (not shown), and the roller is exposed to the photosensitive member at a predetermined peripheral speed ratio. It is rotationally driven in the same direction as the body moving direction. A supply roller 3 as a toner supply member is arranged below the developing roller 2 so as to come into contact with the developing roller 2, and the roller 3 is as shown in the directions of arrows A and B in the figure. The rubbing portion a is driven to rotate in the same direction as the developing roller 2 with respect to the developing roller 2 at a predetermined peripheral speed ratio. The rubbing portion a is the toner supply position of the supply roller 3 to the developing roller 2.

In the vicinity of the opening 1a, urethane rubber is provided so that one end of the developing roller 2 is in contact with the developing roller 2 on the downstream side of the sliding portion a of the developing roller 2 in the moving direction of the developing roller surface. A blade 6 made of an elastic material such as is provided. Further, reference numerals 4 and 5 in the drawing denote first and second screw-shaped toner conveying members, respectively, from a toner hopper 9 arranged at one end side of the developing device as shown in FIGS. 1B and 1C. The developing roller 2 and the supply roller 3 are arranged in parallel to the other side plate of the developing device. Then, in order to convey the toner in the opposite directions, specifically, the first toner conveying member 4 is moved from the toner hopper 9 into the developing device to the second portion.
The toner conveying member 5 is interlocked with each other so as to convey the toner from the developing device into the toner hopper 9, and is rotationally driven in the directions of arrows C and D with a predetermined peripheral speed ratio as shown in FIG. There is.

The developing roller is 10 ¹² Ω · cm.
The following dielectric single-layer roller, the conductive foam polyurethane sponge roller as the supply roller 3, and the metal plate as the blade 6 can be used. A predetermined blade bias can be applied to this blade.

The supply roller 3 is arranged in contact with the case of the developing device. As a result, the developing roll
The first toner transporting space 7 surrounding the first toner transporting member 4 by the roller 2, the supply roller 3 and the casing 1.
Is formed. In the toner carrying space 7, the toner carried in from the toner hopper 9 by the first toner carrying member 4 is carried over the entire axial length of the supply roller 3,
The toner is supplied onto the supply roller 3 uniformly in the axial direction. The supplied toner is supplied while being charged to the developing roller 2 at the rubbing portion a, and is electrostatically carried on the surface of the developing roller 2. The toner carried on the developing roller 2 is made uniform by the blade 4 into a thin toner layer having a predetermined thickness, which contributes to the contact or non-contact development of the electrostatic latent image formed on the surface of the photoconductor. To do.

Further, of the toner supplied by the supply roller 3, the surplus toner not carried on the surface of the developing roller 2 falls on the second toner conveying member 5 due to gravity,
The second toner conveying member 5 conveys the toner in the opposite direction to the first toner conveying member 4 and collects it in the toner hopper 9.

Here, the toner supplied by the first toner conveying member 4 onto the supply roller 3 is not necessarily the minimum, and all the toner supplied onto the supply roller 3 is supplied to the developing roller 2. It does not contribute to development. Most of them pass through the rubbing portion a with the developing roller 2 while being attached to the surface of the supply roller 3, and those carried by the hook are dropped onto the second toner conveying member 5.

Ideally, the surface of the supply roller 3 is completely initialized at the time of this toner drop or the subsequent contact with the case 1, and preparations are made to receive the next toner. However, in reality, the toner on the supply roller 3 does not drop completely, and some residual toner remains attached. In some cases, such toner may semi-permanently remain on the surface of the supply roller 3, and this may balance the triboelectric charging between the developing roller 2 of the non-magnetic one-component developing system, the toner, and the supply roller 3. There is a possibility that the development characteristics may change over time.

Therefore, in this embodiment, as shown in FIG.
The first toner conveying member 4 is arranged so as to contact the surface of the supply roller 3 as shown in FIG. As a result, the residual toner is scraped off at the contact portion with the first toner conveying member 4.

As the above-mentioned second toner conveying member 4, FIG.
As shown in (a), a blade having an outer peripheral end face having a width p and having a ratio of the width p and the width q of the groove portion set to 2: 1 was used. The contact width was brought into contact. Then, the supply roller 3 is set to 60 mm / sec.
To rotate the second toner conveying member 4 at least 150 rp
When the toner was rotated in the rotating direction at m, the toner could be scraped off uniformly from the surface of the supply roller 3, and good development was possible.

As the toner conveying member 4, as shown in FIG. 2 (b), a member whose side surface is coated with a resin 4a, or a member whose entire blade portion is made of a resin material itself may be used. it can. As the resin, silicon resin (for negatively charged toner) and fluorine resin (for positively charged toner) such as those used for the surface material of the developing roller 2 are charged to opposite polarities due to friction with the toner, and as a result, It is desirable that the toner electrostatically adheres to the surface of the toner recovery screw, so that the toner remaining on the supply roller 3 is removed. Note that the toner attached to the side surface of the toner conveying member 4 in the above process is scraped by the toner to be conveyed or scraped off at the time of friction with the next supply roller 3, so there is no problem.

Further, in order to improve efficiency when the surface of the toner conveying member 4 comes into contact with the supply roller 3 and scrapes off the toner, the contact portion 4b with the supply roller 3 is as shown in FIG. 2 (c). It is also possible to use the one roughened to 2 to 5 μm by sandblasting.

Further, as shown in FIG. 2 (c), the side surface portion 4c of the second toner conveying member 4 is provided with polystyrene and / or poly.
It is also possible to use a toner material itself coated with a toner or the like. On the supply roller 3, it is considered that the toner carried by a simple mechanical catch and the toner adhering to the surface of the supply roller 3 by the electrostatic action are present, and most of the former is gravity. However, in order to remove the latter, it is necessary to lower the charge of the toner as much as possible. It is generally known that when friction is made between substances of the same kind, there is little or no electrostatic charge. Therefore, if the second toner conveying member 4 of this example is used, the charge of the toner is reduced by rubbing it against the conveying screw coated with the same kind of material as the toner itself, thereby facilitating the peeling.

Next, another embodiment in which the present invention is applied to a developing device using a non-magnetic one-component toner used in an electrophotographic copying machine will be described. FIG. 3A is a schematic configuration diagram of a developing device in the developing device according to the present embodiment, FIG. 3B is a front view of a carrying screw in the developing device, and FIG. 3C is a side view of the carrying screw. . The developing device of this embodiment uses a second toner carrying member 5 instead of bringing the first toner carrying member 4 into contact with the supply roller 3 in order to remove the residual toner on the supply roller 3. The other points are the same as those in the above-mentioned embodiment. Therefore, in order to avoid duplication of description, the same reference numerals are given to members corresponding to each other,
Description is omitted.

In this embodiment, the second toner conveying member 5 rubs the surface of the supply roller 3 to remove the residual toner. As the second toner conveying member 5 for this purpose,
It is possible to use a member having the same shape as the first toner conveying member 4 in the above-mentioned embodiment and arrange it so as to contact the supply roller 3. Further, as shown in FIGS. 3A to 3C, as the second toner conveying member 5, the blade 5b of the screw member including the shaft 5a and the blade 5b is attached to the toner scraping member 12 (for example, polyester manufactured by Bridgestone Corporation). Each rod-shaped member made of film PETP or rubber NR)
It is also possible to use a fixed one. This is installed so as to be in contact with the supply roller 3, scrapes off the residual toner on the surface of the supply roller 3 at the sliding portion against the surface of the supply roller, and conveys it to the toner hopper 9. It is desirable to set the roller diameter, the contact nip width, and the linear velocity ratio so that the toner scraping member 12 continuously contacts the surface of the supply roller 3.

It is also possible to use the second toner carrying member 5 as shown in FIGS. 4 (a) and 4 (b). The second toner carrying member 5 is provided with a cylindrical toner scraping member 13 coaxially with the screw member. The cylindrical member 13 is provided with a large number of toner passage holes 13a. By installing this so as to be in contact with the surface of the supply roller 3, the residual toner on the surface of the supply roller 3 is scraped off at the rubbing portion, and is transferred to the toner hopper 9 by the screw-shaped conveying member inside. Excess toner can be transported. As the cylindrical member, those having the shapes shown in FIGS. 5A and 5B can also be used. FIG. 5A shows a hole 13 for passing toner.
By forming a in a slit shape, the toner passing property is improved and the residual toner property is also improved. Also in FIG.
(B) The cylindrical scraping member 13 has a bristle brush 1 on the surface.
3b is planted to improve scraping efficiency. The shape of the second toner carrying member shown in FIGS. 3 to 5 can be applied to the first toner carrying member in the above embodiment.

Next, another embodiment in which the present invention is applied to a developing device using a non-magnetic one-component toner used in an electrophotographic copying machine will be described. FIG. 6 is a schematic configuration diagram of the developing device in the developing device according to the present embodiment. In the developing device of this embodiment, in order to remove the residual toner on the supply roller 3, between the second toner conveying member 5 and the supply roller 3,
An electric field is formed so as to transfer the charged toner from the supply roller 3 to the second toner conveying member 5 side, and the other points are the same as in the above embodiment. Therefore, in order to avoid duplication of description, members corresponding to each other are designated by the same reference numerals, and description thereof will be omitted. In FIG. 6, a voltage applying means 11 is connected to the second toner conveying member 5, a voltage (more than the voltage applied to the supply roller 3) is applied to generate an electric field, and the supply roller is electrically operated. The residual toner on the surface of No. 3 is removed. Then, the toner is conveyed to the toner tank together with the toner dropped by its own weight. In the present embodiment, the second toner carrying member 5 must be provided close to or in contact with the supply roller 3, but in the case of contact, in order to avoid the generation of spiral unevenness due to the screw,
It is desirable that the width p of the screw shown in (a) be wider than the width p between the screws, and that the roller diameter, the contact nip width between the supply roller 3 and the second toner conveying member, and the linear velocity ratio be adjusted. .

[0037]

According to the developing device of the present invention, by disposing the rotary member for transporting the developer at a position in contact with the surface of the developer supplying member, the rotary member for conveying the developer remains on the surface of the developer supplying member. Since it has a function to remove the developer,
As compared with a case where a dedicated member is additionally provided to remove the residual developer, it is possible to suppress the size increase and cost increase of the apparatus. Further, since at least a part of the remaining amount of the developer removed from the surface of the developer supply member can be conveyed as it is in the predetermined direction by the developer conveying rotary member, the developer conveyer and the toner are conveyed by the developer conveying rotary member. At least a part of the removed residual developer can be taken in between the accommodating portion or the developer circulation path formed in the developing device. Therefore, it is possible to suppress the residual developer removed above from locally staying in the developing device or the like.

Particularly, according to the developing device of the second or third aspect, the scraping portion for scraping off the developer formed on the surface of the developer conveying rotary member is brought into contact with the surface of the developer supplying member. Since the remaining amount of toner adhering to the surface is mechanically peeled off, the developer carrying rotating member, which is mainly shaped for carrying, is simply contacted with the surface of the developer supplying member. It is possible to remove the residual developer satisfactorily with less uneven stripping as compared with the case where the residual developer is disposed.

Further, according to the developing device of the third aspect, the outer peripheral end surface of the blade portion of the screw member as the rotary member for conveying the developer is sandblasted so that the residual developer is peeled off due to catching. Since the number of screws is increased as compared with the normal screw member, the developer can be removed well as compared with the case where the normal screw member is simply arranged so as to contact the surface of the developer supply member. You can Moreover, the performance of removing the developer can be improved by the inexpensive processing such as sandblasting.

In particular, according to the developing device of claim 4,
When a portion of the developer transporting rotary member formed of a predetermined material comes into contact with the surface of the developer supply member, the developer is frictionally charged to a predetermined polarity, and the developer is charged by the counter charge. Is electrostatically attracted, so that the performance of removing the residual developer from the surface of the developer supply member can be improved.

In particular, according to the developing device of claim 5,
The portion of the rotary member for transporting the developer that comes into contact with the surface of the developer supplying member is made of the same material as the developer or a material substantially the same as the developer in the triboelectrification series. The developer attached to the surface of the member is not charged up by friction. Therefore, unlike the case where such charge-up occurs, the developer is charged to a predetermined polarity by friction, and the developer supply member surface that electrostatically attracts the developer by the counter charge of the charge, It is possible to prevent the removal performance of the residual developer from being deteriorated by increasing the suction force with the developer.

According to the developing device of the sixth aspect, a predetermined electric field is generated between the developer conveying rotary member and the developer supplying member arranged at a predetermined position, so that the developer conveying rotary member is caused to generate a predetermined electric field. Since it has a function to remove the residual developer from the surface of the developer supply member, the size and cost of the device are increased compared to the case where a dedicated member is added to remove the residual developer. Can be suppressed. Also,
The remaining amount of the developer removed from the surface of the developer supply member and attached to the developer transport rotary member can be directly transported in a predetermined direction by the developer transport rotary member, so that the developer transport rotary member transports it. Between the developing unit and the toner storage unit,
Alternatively, at least a part of the removed residual developer can be taken into the developer circulation path formed in the developing device. Therefore, it is possible to suppress the residual developer removed above from locally staying in the developing device or the like.

[Brief description of drawings]

FIG. 1A is a schematic configuration diagram of a developing device in a developing device according to an embodiment. FIG. 3B is a perspective view of the developing device. FIG. 3C is a side sectional view of the developing device.

FIG. 2A is a side view of a transfer screw in the developing device. (B) thru | or (d) is explanatory drawing of the same conveyance screw which concerns on a modification, respectively.

FIG. 3A is a schematic configuration diagram of a developing device in a developing device according to another embodiment. FIG. 3B is a front view of the transport screw in the developing device. (C) is a side view of the same conveyance screw.

FIG. 4A and FIG. 4B are explanatory views of the transport screw according to a modified example.

5 (a) and 5 (b) are explanatory views of the same conveying screw according to another modification.

FIG. 6 is a schematic configuration diagram of a developing device in a developing device according to still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Developing device casing 2 Development roller 3 Supply roller 4 1st conveyance member 5 2nd conveyance member 6 Blade 7 1st conveyance space 8 2nd conveyance space 9 Toner hopper 11 Voltage application device 12 Toner Scraping Member 13 Cylindrical Toner Scraping Member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yuichi Ueno 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Kazumasa Hirai 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd. (72) Inventor Katsuhiro Aoki 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Inventor Umitsu Fujishiro 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. Within

Claims (6)

[Claims] 1. A developer carrying member carrying a developer for developing a latent image on a latent image carrying member, a developer supplying member for supplying a developer to the developer carrying member, and the developer supplying member. A developing device equipped with a developer carrying rotating member for carrying developer in the longitudinal direction of the developer supplying member in the vicinity of the developer carrying member, wherein the developer carrying member is rotated so as to come into contact with the surface of the developer supplying member. A developing device in which members are arranged. 2. The developing device according to claim 1, wherein a scraping portion for scraping off the developer adhering to the surface of the developer supplying member is formed on the outer peripheral portion of the developer transporting rotary member, and the scraping portion is formed. A developing device, wherein the developer transporting rotary member is arranged such that a dropping portion contacts the surface of the developer supply member. 3. The developing device according to claim 2, wherein a screw member is used as the developer conveying rotary member, and the outer peripheral end surface of the blade portion of the screw member is sandblasted to form the scraped portion. Characteristic developing device. 4. The developing device according to claim 1, wherein a portion of the rotary member for transporting the developer, which is in contact with the surface of the developer supplying member, is made of a material capable of charging the developer to a predetermined polarity by friction. A developing device characterized in that 5. The developing device according to claim 1 or 2, wherein the developer supplying member is one that can charge the developer to a predetermined polarity by friction. A developing device characterized in that a portion in contact with the surface is formed of the same material as the developer or a material substantially the same as the developer in a triboelectric charging series. 6. A developer carrying member carrying a developer for developing a latent image on a latent image carrying member, a developer supplying member for supplying a developer to the developer carrying member, and the developer supplying member. A developing device provided with a rotating member for carrying a developer in the longitudinal direction of the developer supplying member in the vicinity of the developer supplying member so as to come into contact with or approach the surface of the developer supplying member. A rotary member for charging is disposed between the developer supply member and the rotary member for transporting developer, and the charged developer attached to the surface of the developer supply member is transferred to the rotary member for developer transport. A developing device comprising electric field generating means for generating an electric field to be transferred.