JP2021032987A - Developing device and image forming apparatus - Google Patents

Abstract

To provide a developing device that has a configuration preventing an increase in cost and can prevent scattering of developer to the outside of a developer container.SOLUTION: A developing device 40 comprises: a developer container 41; a developing roller 47; and a regulation blade 48. The developing roller 47 supplies toner to a photoreceptor drum in a development area opposite to the photoreceptor drum. The regulation blade 48 is arranged on the upstream side in the direction of rotation from the developing roller 47 in the development area, and regulates the layer thickness of a developer carried by the developing roller 47. An exhaust unit 61 is formed between a side face 481 of the regulation blade 48 on the upstream side in the direction of rotation from the developing roller 47 and a wall part 411 of the developer container 41 opposite to the side face 481, and exhausts air from the inside to the outside of the developer container 41 through an exhaust port 611 opening at a tip part. A filtration unit 62 is arranged in an exhaust pipe 61 adjacent to the exhaust port 611 and regulates leakage of the developer from the exhaust port 611.SELECTED DRAWING: Figure 4

Description

The present invention relates to a developing device and an image forming device including the developing device.

In electrophotographic image forming devices such as copiers and printers, toner is transferred to paper later by adhering toner to an electrostatic latent image formed on the surface of an image carrier such as a photoconductor drum and developing it. Devices for forming images are widely used. In the developing apparatus, in order to continuously form a uniform image, a developing agent containing toner contained in the developing container is conveyed inside the developing container with stirring.

In the developing apparatus, air may be sucked into the developing container from the outside by rotating the developing roller and the stirring member, and the air pressure in the developing container may increase. Due to the increase in air pressure inside the developing container, there is a risk that the developing agent may scatter from the inside to the outside of the developing container. Patent Document 1 discloses an example of a conventional technique for solving such a problem.

In the developing apparatus of the conventional image forming apparatus disclosed in Patent Document 1, a developing roller is arranged in an upper part in a housing (developing container), and a stirring screw is arranged in a lower part. A communication port is formed in a region of the cover arranged on the upper surface of the housing on the opposite side of the developing region where the developing roller and the photoconductor drum face each other with the developing roller separated. The communication port opens upward to communicate the inside and the outside of the housing and is covered with a filter. As a result, it is possible to prevent toner from leaking while suppressing an increase in the air pressure inside the developing apparatus.

Japanese Unexamined Patent Publication No. 2017-21280

A large amount of toner in the developing container floats in a region where the toner is peeled off from the developing roller during the developing operation on the downstream side in the rotation direction of the developing roller in the developing region where the developing roller and the photoconductor drum face each other. The developing device of the conventional image forming apparatus disclosed in Patent Document 1 has a problem that a communication port is formed near a region where a large amount of toner peeled from a developing roller floats. As a result, it is necessary to use an expensive high-performance filter having high toner sealing performance and high air passage performance.

The present invention has been made in view of the above points, and provides a developing apparatus and an image forming apparatus capable of suppressing scattering of a developing agent to the outside of a developing container with a configuration in which an increase in cost is suppressed. The purpose is.

In order to solve the above problems, the developing apparatus of the present invention includes a developing container, a developing agent carrier, and a regulating blade. The developing container contains a developing agent containing toner to be supplied to the image carrier. The developer carrier is rotatably supported by the developing vessel and supplies the toner in the developing vessel to the image carrier in the developing region facing the image carrier. The regulating blade is arranged on the upstream side of the developing region in the rotation direction of the developer carrier, and regulates the layer thickness of the developer supported by the developer carrier. Further, the developing device includes an exhaust unit and a filtration unit. The exhaust portion is formed between the side surface of the regulating blade on the upstream side in the rotation direction of the developer carrier and the wall portion of the developing container facing the side surface, and the developing container is formed through an exhaust port opening at the tip portion. Exhaust air from the inside to the outside. The filtration unit is arranged in the exhaust unit adjacent to the exhaust port to regulate the leakage of the developer from the exhaust port.

According to the configuration of the present invention, an exhaust portion for suppressing an increase in air pressure in the developing container is formed adjacent to the regulation blade. Further, a large amount of the developer for supplying to the image carrier is sent to the region where the layer thickness of the developer supported by the developer carrier is regulated by the regulation blade, and the amount of suspended toner is reduced. That is, the exhaust section can be provided in a region where the amount of floating toner peeled off from the developer carrier during the developing operation is small, and even an inexpensive filter (filter section) can effectively regulate the leakage of the developer from the exhaust port. Can be done. As a result, it is possible to suppress the scattering of the developer to the outside of the developing container with the configuration in which the cost increase is suppressed.

It is schematic cross-sectional view which shows the structure of the image forming apparatus of embodiment of this invention. It is a vertical cross-sectional view of the image forming part of the image forming apparatus of embodiment of this invention. It is a horizontal sectional view of the developing apparatus of the image forming apparatus of an embodiment of this invention. It is a vertical cross-sectional view which shows the periphery of the exhaust part of the developing apparatus of 1st Embodiment of this invention. It is a horizontal sectional view of the developing apparatus of the 2nd Embodiment of this invention. It is a partial side view which shows the periphery of the exhaust part of the developing apparatus of the 2nd Embodiment of this invention. It is a partial horizontal sectional view of the exhaust part of the developing apparatus of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following contents.

FIG. 1 is a schematic cross-sectional view showing the configuration of the image forming apparatus 1 of the embodiment. FIG. 2 is a cross-sectional view showing the periphery of the image forming portion 20 of the image forming apparatus 1. An example of the image forming apparatus 1 of the present embodiment is a tandem color printer that transfers a toner image onto paper P using an intermediate transfer belt 31. The image forming apparatus 1 may be a so-called multifunction device having functions such as printing (printing), scanning (image reading), and facsimile transmission.

As shown in FIGS. 1 and 2, the image forming apparatus 1 has a paper feeding unit 3, a paper conveying unit 4, an exposure unit 5, an image forming unit 20, a transfer unit 30, and a fixing unit 6 provided in the main body 2. , A paper ejection unit 7 and a control unit 8.

The paper feeding unit 3 accommodates a plurality of sheets of paper P, and separates and feeds out the paper P one by one at the time of printing. The paper transport unit 4 conveys the paper P fed from the paper feed unit 3 to the secondary transfer unit 33 and the fixing unit 6, and further discharges the fixed paper P from the paper ejection port 4a to the paper ejection unit 7. .. When double-sided printing is performed, the paper transport unit 4 distributes the paper P after fixing on the first side to the reverse transport unit 4c by the branch portion 4b, and the paper P is again transferred to the secondary transfer unit 33 and the fixing unit 6. Transport. The exposure unit 5 irradiates the image forming unit 20 with a laser beam controlled based on the image data.

The image forming unit 20 is arranged below the intermediate transfer belt 31. The image forming unit 20 includes an image forming unit 20Y for yellow, an image forming unit 20C for cyan, an image forming unit 20M for magenta, and an image forming unit 20B for black. These four image forming units 20 have the same basic configuration. As a result, in the following description, the identification symbols of "Y", "C", "M", and "B" representing each color may be omitted unless it is particularly necessary to limit them.

The image forming unit 20 includes a photoconductor drum (image carrier) 21 rotatably supported in a predetermined direction (clockwise in FIGS. 1 and 2). The image forming unit 20 further includes a charging unit 22, a developing device 40, and a drum cleaning unit 23 around the photoconductor drum 21 along the rotation direction thereof. The primary transfer unit 32 is arranged between the developing device 40 and the drum cleaning unit 23.

The charging unit 22 charges the surface of the photoconductor drum 21 to a predetermined potential. Then, an electrostatic latent image of the original image is formed on the surface of the photoconductor drum 21 by the laser light emitted from the exposure unit 5. The developing device 40 attaches toner to the electrostatic latent image and develops it to form a toner image. Each of the four image forming units 20 forms toner images of different colors.

The transfer unit 30 includes an intermediate transfer belt 31, a primary transfer unit 32Y, 32C, 32M, 32B, a secondary transfer unit 33, and a belt cleaning unit 34. The intermediate transfer belt 31 is arranged above the four image forming portions 20. The intermediate transfer belt 31 is an intermediate transfer body that is rotatably supported in a predetermined direction (counterclockwise in FIG. 1) and in which toner images formed by each of the four image forming portions 20 are sequentially superimposed and primary transferred. .. The four image forming portions 20 are arranged in a so-called tandem system in which the intermediate transfer belt 31 is arranged in a row from the upstream side to the downstream side in the rotation direction.

The primary transfer portions 32Y, 32C, 32M, 32B are arranged above the image forming portions 20Y, 20C, 20M, 20B of each color with the intermediate transfer belt 31 interposed therebetween. The secondary transfer unit 33 is on the upstream side of the paper transport unit 4 in the paper transport direction with respect to the fixing unit 6, and is an intermediate transfer belt 31 from the image forming units 20Y, 20C, 20M, and 20B of each color of the transfer unit 30. It is arranged on the downstream side in the rotation direction of. The belt cleaning unit 34 is arranged on the upstream side in the rotation direction of the intermediate transfer belt 31 with respect to the image forming units 20Y, 20C, 20M, and 20B of each color.

The toner image is first transferred to the outer peripheral surface of the intermediate transfer belt 31 by the primary transfer portions 32Y, 32C, 32M, 32B of each color. Then, as the intermediate transfer belt 31 rotates, the toner images of the four image forming portions 20 are continuously superimposed and transferred to the intermediate transfer belt 31 at a predetermined timing, so that the outer peripheral surface of the intermediate transfer belt 31 is yellow. A color toner image is formed by superimposing four color toner images of cyan, magenta, and black. The drum cleaning unit 23 removes toner and the like remaining on the surface of the photoconductor drum 21 after the primary transfer for cleaning.

The color toner image on the outer peripheral surface of the intermediate transfer belt 31 is transferred to the paper P synchronously sent by the paper transport unit 4 by the secondary transfer nip portion formed in the secondary transfer unit 33. The belt cleaning unit 34 cleans by removing toner and the like remaining on the surface of the intermediate transfer belt 31 after the secondary transfer.

The fixing unit 6 heats and pressurizes the paper P on which the toner image is transferred to fix the toner image on the paper P.

The control unit 8 includes a CPU (not shown), an image processing unit, a storage unit, other electronic circuits, and electronic components (not shown). The CPU controls the operation of each component provided in the image forming apparatus 1 based on the control program or data stored in the storage unit, and performs processing related to the function of the image forming apparatus 1. The paper feed unit 3, the paper transport unit 4, the exposure unit 5, the image forming unit 20, the transfer unit 30, and the fixing unit 6 each receive commands individually from the control unit 8 and interlock with each other to print on the paper P. The storage unit is composed of a combination of a non-volatile storage device such as a program ROM (Read Only Memory) and a data ROM (not shown) and a volatile storage device such as a RAM (Random Access Memory).

Subsequently, the configuration of the developing apparatus 40 will be described with reference to FIG. 3 in addition to FIG. FIG. 3 is a horizontal sectional view of the developing device 40. Since the developing apparatus 40 for each color has the same basic configuration, the description and description of the identification symbol representing each color for the constituent elements will be omitted. Further, in this description, the "axis direction" is the axial direction of rotation of each of the photoconductor drum 21, the first stirring member 45, the second stirring member 46, and the developing roller 47 extending in parallel with each other (the paper depth direction in FIG. 2, FIG. 3 left and right lateral direction).

The developing device 40 can be attached to and detached from, for example, the main body 2 of the image forming device 1. As shown in FIGS. 2 and 3, the developing apparatus 40 includes a developing container 41, a partition portion 42, a first stirring chamber 43, a second stirring chamber 44, a first stirring member 45, a second stirring member 46, and a developing roller 47. , A regulated blade 48 and a developer supply tube 49.

The developing container 41 contains, for example, a two-component developing agent containing toner and a magnetic carrier as a developing agent supplied from the developing device 40 to the surface of the photoconductor drum 21. The developing container 41 has an elongated shape extending along the axial direction in which the center of rotation of the photoconductor drum 21 extends, and is arranged with the longitudinal direction thereof horizontal.

The partition portion 42 is provided at the lower part inside the developing container 41. The partition portion 42 is provided at a substantially central portion of the lower part of the developing container 41 in a direction intersecting the axial direction (left-right lateral direction in FIG. 2), and extends in the axial direction and the vertical direction. The partition portion 42 divides the inside of the developing container 41 in a direction intersecting the axial direction.

The first stirring chamber 43 and the second stirring chamber 44 are provided inside the developing container 41. The first stirring chamber 43 and the second stirring chamber 44 are formed by dividing the inside of the developing container 41 by a partition portion 42, and are arranged in parallel with each other. The second stirring chamber 44 is arranged adjacent to the inside of the developing container 41 below the arrangement region of the developing roller 47. The first stirring chamber 43 is arranged in a region inside the developing container 41 that is separated from the developing roller 47 by the second stirring chamber 44. The first stirring chamber 43 receives the replenishment of the developer via the developer replenishment pipe 49 shown in FIG.

The partition portion 42 includes a first communication portion 421 and a second communication portion 422. The first communication portion 421 and the second communication portion 422 are arranged on both end sides in the axial direction of the partition portion 42, respectively. The first communication section 421 and the second communication section 422 penetrate the partition portions 42 on both ends in the longitudinal direction of the first stirring chamber 43 and the second stirring chamber 44, respectively, and the first stirring chamber 43 and the second stirring chamber 43 Let 44 communicate.

The first stirring member 45 is arranged inside the first stirring chamber 43. The second stirring member 46 is arranged inside the second stirring chamber 44. The first stirring member 45 and the second stirring member 46 are supported by the developing container 41 so as to be rotatable around an axis extending parallel to the photoconductor drum 21. By rotating around the axis of the first stirring member 45 and the second stirring member 46, the developer is conveyed while stirring in opposite directions along the axis of rotation, and the developer is conveyed in a predetermined conveying direction (FIG. 3). Circulate in the direction of arrows F1 and F2).

Due to the rotation of the first stirring member 45 and the second stirring member 46, the developer passes through the first communication portion 421 and the second communication portion 422 provided at both ends in the axial direction of the partition portion 42, and the first stirring is performed. It circulates between the chamber 43 and the second stirring chamber 44. In the first stirring chamber 43 and the second stirring chamber 44, toner (positively charged toner) supplied from the outside is mixed with the magnetic carrier, stirred, and charged.

The developing roller 47 is arranged inside the developing container 41 above the second stirring member 46. The developing roller 47 is supported by the developing container 41 so as to be rotatable around an axis extending parallel to the photoconductor drum 21. The developing roller 47 has, for example, a cylindrical developing sleeve that rotates counterclockwise in FIG. 2 and a developing roller-side magnetic pole fixed in the developing sleeve (both not shown). A predetermined developing voltage in which an AC voltage is superimposed on a DC voltage is applied to the developing roller 47. A part of the surface of the developing roller 47 is exposed from the developing container 41 and faces the photoconductor drum 21. The developing roller 47 carries the developer in the second stirring chamber 44, and supplies toner to the surface of the photoconductor drum 21 in the developing region facing the photoconductor drum 21.

The regulation blade 48 is arranged on the upstream side in the rotation direction of the developing roller 47 in the developing region where the developing roller 47 and the photoconductor drum 21 face each other. The regulation blade 48 is arranged close to the developing roller 47 and at a predetermined distance between the tip thereof and the surface of the developing roller 47. The regulation blade 48 extends over the entire axial direction of the developing roller 47. The regulating blade 48 regulates the layer thickness of the developer carried by the developing roller 47 that passes through the gap between the tip thereof and the surface of the developing roller 47.

The developer is stirred, circulated and charged by the first stirring member 45 and the second stirring member 46 in the first stirring chamber 43 and the second stirring chamber 44, and is supported on the surface of the developing roller 47. The layer thickness of the developer supported on the surface of the developing roller 47 is regulated by the regulating blade 48. On the surface of the developing roller 47, a magnetic brush (not shown) composed of toner and a magnetic carrier is formed. When a predetermined development voltage is applied to the developing roller 47, the toner carried on the surface of the developing roller 47 flies to the surface of the photoconductor drum 21 in the developing region due to the potential difference between the surface potential of the photoconductor drum 21 and the surface potential of the photoconductor drum 21. Then, the electrostatic latent image on the surface of the photoconductor drum 21 is developed.

The developer supply tube 49 is arranged on one end side of the developing container 41 in the axial direction of the developing roller 47 and extends in the vertical direction. The lower end of the developer supply pipe 49 is located outside the first stirring chamber 43 in the axial direction and communicates with the first stirring chamber 43. The first stirring member 45 extends to the lower part of the developer supply pipe 49. The upper end of the developer supply tube 49 is connected to a developer transfer section (not shown) provided in the main body 2 of the image forming apparatus 1.

Regarding the supply of the developing agent to the developing device 40, the image forming apparatus 1 includes a container 51 shown in FIG. 1 and a developing agent conveying unit. Both the container 51 and the developer carrier are arranged above the developing apparatus 40. The container 51 and the developer transport section are provided with four each corresponding to the four colors of yellow, cyan, magenta, and black. The container 51 houses the developing agent to be replenished in the developing apparatus 40, and is removable from the developing agent conveying section. The developer contained in the container 51 is replenished to the first stirring chamber 43 of the developing container 41 via the developer transport section and the developer supply pipe 49.

FIG. 4 is a vertical cross-sectional view showing the periphery of the exhaust portion 61 of the developing apparatus 40 of the first embodiment. For example, the developing device 40 of the first embodiment includes an exhaust unit 61 and a filtration unit 62 shown in FIG.

The exhaust portion 61 is formed between the side surface 481 of the regulation blade 48 on the upstream side in the rotation direction of the developing roller 47 and the wall portion 411 of the developing container 41 facing the side surface 481. The exhaust portion 61 extends over the entire side surface 481 of the regulation blade 48 in the axial direction of the developing roller 47. The exhaust unit 61 approaches and separates from the developing roller 47 along the side surface 481 of the regulating blade 48 in a direction intersecting the axial direction of the developing roller 47, and is from the inside side to the outside side of the developing container 41. Extend towards.

The exhaust port 61 opens at the lower end, which is the tip of the exhaust roller 47 away from the developing roller 47. The exhaust unit 61 exhausts air from the inside of the developing container 41 to the outside through an exhaust port 611 that opens at the tip portion. The air flowing through the exhaust unit 61 enters the exhaust unit 61 along the arrow line Ra1 shown in FIG. 4, is discharged from the exhaust port 611, and is sent to the outside of the developing device 40 along the arrow line Ra2. Be done.

The filtration unit 62 is arranged in the exhaust unit 61 adjacent to the exhaust port 611. The filtration unit 62 is arranged on the upstream side of the exhaust port 611 with respect to the air flow direction in the exhaust unit 61. The filtration unit 62 allows only air to flow and restricts the passage of the developer. That is, the filtration unit 62 regulates the leakage of the developer from the exhaust port 611.

According to the above configuration, the exhaust portion 61 for suppressing the increase in the air pressure in the developing container 41 is formed adjacent to the regulation blade 48. Further, a large amount of the developer for supplying to the photoconductor drum 21 is sent to the region where the layer thickness of the developer supported on the developing roller 47 is regulated by the regulating blade 48, and the amount of floating toner is reduced. That is, the exhaust unit 61 can be provided in a region where the amount of floating toner peeled off from the developing roller 47 during the developing operation is small, and even an inexpensive filter (filtration unit) effectively regulates leakage of the developer from the exhaust port 611. be able to. As a result, it is possible to suppress the scattering of the developer to the outside of the developing container 41 with the configuration in which the cost increase is suppressed.

The filtration unit 62 has a filter member 621 that covers the exhaust port 611. The filter member 621 is made of urethane, for example, and is filled over the entire area in the exhaust section 61 in a direction intersecting the air flow direction. According to this configuration, it is possible to effectively suppress the cost increase.

And it is more preferable that the filter member 621 has an open cell structure. According to this configuration, the air circulation performance can be improved.

FIG. 5 is a horizontal sectional view of the developing apparatus 40 of the second embodiment. Since the basic configuration of the second embodiment is the same as that of the first embodiment described above, the common components are given the same reference numerals and the same names as before, and the description thereof is omitted. In some cases, the description of the configuration other than the featured parts may be omitted.

The developing device 40 of the second embodiment includes the exhaust unit 71 shown in FIG. The exhaust portion 71 is formed on one end side in the axial direction of rotation of the developing roller 47. Specifically, the exhaust portion 71 is formed at the upstream end portion in the developing agent transport direction F2 by the second stirring member 46 extending in parallel with the developing roller 47.

FIG. 6 is a partial side view showing the periphery of the exhaust portion 71 of the developing apparatus 40 of the second embodiment. FIG. 7 is a partial horizontal sectional view of the exhaust portion 71 of the developing apparatus 40 of the second embodiment. Note that FIG. 6 is a schematic appearance of the side surface of the developing device 40 as viewed from the direction pointed to by the arrow line VI shown in FIG. The state where the two-dot chain line) is removed is drawn. Further, FIG. 7 is a partial horizontal cross-sectional view of the exhaust unit 71 shown in FIG. 6 as viewed from above on lines VII-VII.

The exhaust unit 71 has an exhaust pipe 711 shown in FIGS. 6 and 7. The exhaust pipe 711 is formed so as to face a part of the rotation axis direction of the developing roller 47. Specifically, the exhaust pipe 711 is formed at the upstream end of the developer transport direction F2 (see FIG. 5) by the second stirring member 46 so as to face a part of the developing roller 47 in the axial direction. ..

The exhaust pipe 711 extends from the inside side of the developing container 41 toward the outside side (from the upper side to the lower side in FIG. 6). Specifically, the exhaust pipe 711 extends from the inflow port 7111 provided on the inner side of the developing container 41 to the exhaust port 7112 provided on the outer side of the developing container 41. The exhaust port 7112 includes two exhaust ports 7112A and 7112B. That is, in the exhaust pipe 711, the exhaust port 7112 opens at the tip portion on the outer side of the developing container 41.

As shown in FIG. 6, the exhaust pipe 711 of the present embodiment is formed in a T-shape when viewed from a direction intersecting the axial direction of the developing roller 47, for example. The exhaust pipe 711 of the present embodiment has one inflow port 7111 and two exhaust ports 7112A and 7112B. One of the exhaust ports 7112A faces the inflow port 7111 along a direction intersecting the axial direction of the developing roller 47. The other exhaust port 7112B is arranged at a point where an air flow path extending straight from the inflow port 7111 to one exhaust port 7112A branches at a right angle in the middle and extends along the axial direction of the developing roller 47. The shape of the exhaust pipe 711 is not limited to the T-shape, and may be another shape such as a linear shape.

As shown in FIG. 7, the wall portion 411 of the developing container 41 facing the exhaust pipe 711 has a recess 4111. The recess 4111 is recessed in the wall portion 411 in a direction away from the regulation blade 48. The recess 4111 is formed in a T shape along the shape of the exhaust pipe 711. That is, the exhaust pipe 711 has an air flow space including the internal space of the recess 4111 in addition to the space between the side surface 481 of the regulation blade 48 and the wall portion 411 of the developing container 41.

The developing device 40 further includes a filtering unit 72. The filtration unit 72 is arranged in the exhaust pipe 711 adjacent to the exhaust port 7112. The filtration unit 72 is arranged on the upstream side of each of the two exhaust ports 7112 with respect to the air flow direction in the exhaust pipe 711. That is, the filtration unit 72 is formed in a T shape when viewed from a direction intersecting the axial direction of the developing roller 47, for example. The filtration unit 72 has a filter member 721 that covers each of the two exhaust ports 7112, allows only air to flow, and restricts the passage of the developer. That is, the filtration unit 72 regulates the leakage of the developer from each of the two exhaust ports 7112.

The area other than the exhaust pipe 711 between the side surface 481 of the regulation blade 48 and the wall portion 411 of the developing container 41 is filled with the sealing material 73.

According to the configuration of the second embodiment, the exhaust portion 71 for suppressing an increase in the air pressure in the developing container 41 can be formed with a smaller configuration. Therefore, it is possible to create a state in which the developing agent does not easily enter the exhaust unit 71. This makes it possible to enhance the effect of regulating the leakage of the developer from the exhaust port 7112.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the gist of the invention.

For example, in the above embodiment, the image forming apparatus 1 is a so-called tandem type image forming apparatus for color printing in which images of a plurality of colors are sequentially superimposed, but the image forming apparatus 1 is limited to such a model. Instead, it may be an image forming apparatus for color printing or an image forming apparatus for monochrome printing, which is not a tandem type.

The present invention can be used in developing devices and image forming devices.

1 Image forming device 20 Image forming unit 21 Photoreceptor drum (image carrier)
40 Developing device 41 Developing container 46 Second stirring member 47 Developing roller (developer carrier)
48 Regulation blades 61, 71 Exhaust part 62, 72 Filtration part 411 Wall part 481 Side 611 Exhaust port 621 Filter member 711 Exhaust pipe 721 Filter member 7112 Exhaust port

Claims (6)

A developing container containing a developer containing toner to be supplied to the image carrier, and a developing container.
A developer carrier that is rotatably supported by the developing container and supplies the toner in the developing container to the image carrier in a developing region facing the image carrier.
A regulating blade that is arranged on the upstream side of the developing region in the rotation direction of the developing agent carrier and regulates the layer thickness of the developing agent carried by the developing agent carrier.
With
The developing container is formed between the side surface of the regulating blade on the upstream side in the rotation direction of the developing agent carrier and the wall portion of the developing container facing the side surface, and is formed through an exhaust port opened at the tip portion. The exhaust part that exhausts air from the inside to the outside of
A filtration unit that is arranged in the exhaust unit adjacent to the exhaust port and regulates leakage of the developer from the exhaust port, and a filtration unit.
A developing device characterized by comprising. The exhaust portion is formed so as to face a part of the rotation of the developer carrier in the axial direction, extends from the inside side to the outside side of the developing container, and the exhaust port opens at the tip portion. The developing apparatus according to claim 1, wherein the developing apparatus has. A stirring member that extends in parallel with the developer carrier, is rotatably supported inside the developing container, and conveys the developing agent while stirring along the axial direction is provided.
The developing apparatus according to claim 2, wherein the exhaust pipe is formed at an upstream end portion in a transport direction of the developing agent by the stirring member. The developing apparatus according to any one of claims 1 to 3, wherein the filtering unit has a filter member arranged in the exhaust unit. The developing apparatus according to claim 4, wherein the filter member has an open cell structure. An image forming apparatus comprising the developing apparatus according to any one of claims 1 to 5.

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