JP2017156474A - Developing cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent scattered toner from leaking to device main body without upsizing a developing cartridge.SOLUTION: A developing cartridge has: a developer carrier that supplies developer to an electrophotographic photoreceptor; a developing frame body that rotatable supports the developer carrier; and a regulation member that is fixed to the developing frame body, in which at least a part of the regulation member is arranged at a vertical lower part of the developer carrier, and regulates developer on the developer carrier. Then, the developing cartridge includes a capturing member that is arranged at a vertical upper part of the regulation member so as to overlap a part of the regulation member. The capturing member has: an opposing part that opposes the regulation member to form a storage part for storing the developer between the regulation member and the capturing member; a first part that extends toward the regulation member from one end connecting to the opposing part; and a second part in which one end connects to other end of the first part, and extends toward the developer carrier, and other end becomes larger in a gap with the regulation member in comparison with a minimum gap between the regulation member and the other end of the first part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a developing cartridge used in an electrophotographic image forming apparatus. In particular, it is suitable for application to a color electrophotographic image forming apparatus.

  Here, the electrophotographic image forming apparatus forms an image on a recording medium using an electrophotographic image forming system. Examples of the electrophotographic image forming apparatus include an electrophotographic copying machine, an electrophotographic printer (for example, a laser beam printer, an LED printer, etc.), a facsimile apparatus, a word processor, and the like.

  The developing cartridge is a unit for developing a latent image on an electrophotographic photosensitive drum, a developing frame supporting the developing unit, and parts related to the developing unit, and is made detachable from the main body of the image forming apparatus. Is.

  In an image forming apparatus such as a printer using an electrophotographic image forming method (electrophotographic process), an electrophotographic photosensitive member (hereinafter referred to as a photosensitive drum) as an image carrier is uniformly charged. Next, an electrostatic image is formed on the photosensitive drum by selectively exposing the charged photosensitive drum. Next, the electrostatic image formed on the photosensitive drum is visualized as a toner image with toner as a developer. The toner image formed on the photosensitive drum is transferred to a recording material such as recording paper or a plastic sheet, and the toner image is further transferred to the recording material by applying heat or pressure to the recording material. The image is recorded by fixing it to the surface.

  Such an image forming apparatus generally requires maintenance of various process means. In order to facilitate the maintenance of the various process means, the photosensitive drum, the charging means, the developing means, the cleaning means, and the like are collectively assembled into a cartridge, and a process that can be attached to and detached from the image forming apparatus main body (hereinafter, the apparatus main body). A cartridge has been put into practical use. According to the process cartridge system, an image forming apparatus with excellent usability can be provided.

  Such a process cartridge is known to have a unit such as a cleaning unit having a photosensitive drum, a developing unit having a developing unit, and a toner unit for supplying a developer.

  Regarding a configuration in which these units or process cartridges are attached to and detached from the apparatus main body, a method of attaching to and detaching from the apparatus main body along the axial direction of the photosensitive drum has been proposed (see Patent Document 1).

  The developing unit is provided with a developer carrying member for supplying a developer to the photosensitive drum, a developing chamber provided with a developer supplying member for supplying the developer carrying member, and a developing chamber. A developer storage chamber for storing the developer to be stored. Further, it has been proposed that the developer carrying member is arranged vertically above, and the developing chamber in which the developer carrying member is provided is positioned vertically below the developing chamber.

  Further, in the developing unit, in order to prevent the scattered toner from leaking into the image forming apparatus, the one end is fixed and the other end is provided with a sheet member that is in sliding contact with the photosensitive drum. It has been proposed (see Patent Document 2).

Japanese Patent No. 5067913 Japanese Patent No. 5388526

  A configuration in which a developing cartridge can be attached to and detached from the image forming apparatus main body as a developing unit has been studied. In this configuration, when the sheet member for preventing leakage of the scattered toner in the apparatus main body is disposed, the leakage preventing sheet member is slidably contacted with the photosensitive drum in the attaching / detaching direction when the developing cartridge is attached / detached. For this reason, in order to prevent the photosensitive drum from being damaged by rubbing, a retraction mechanism is required for the leakage preventing sheet member provided in the developing cartridge, and the developing cartridge becomes large.

  Accordingly, an object of the present invention is to provide a configuration in which scattered toner does not leak into the apparatus main body without increasing the size of the developing cartridge even when the developing cartridge is detachable.

The developing cartridge according to the present invention is provided detachably with respect to the image forming apparatus main body, and supplies a developer carrying member for supplying the developer to the electrophotographic photosensitive member, and a developing frame member that rotatably supports the developer carrying. And a regulating member that is fixed to the developing device frame, is at least partially disposed below the developer carrying member, and regulates the developer on the developer carrying member. The collecting member is disposed vertically above the restricting member so as to overlap a part of the restricting member. The collecting member faces the restricting member and accommodates the developer between the restricting member. An opposing part forming a part,
A first part extending from one end connected to the opposing portion toward the restriction member, and one end connected to the other end of the first part and extending toward the developer carrying member, and the other end has a gap between the restriction member and the restriction member. And a second portion that is larger than a minimum gap between the first end and the other end of the first portion.

  As described above, according to the present invention, it is possible to prevent the scattered toner from leaking into the apparatus main body without increasing the size of the developing cartridge.

Sectional drawing which shows the collection member vicinity which concerns on the Example of this invention 1 is a cross-sectional view of an image forming apparatus according to an embodiment of the present invention. Sectional drawing of the drum cartridge which concerns on the Example of this invention Sectional drawing of the developing cartridge which concerns on the Example of this invention 1 is a diagram illustrating a configuration in which a drum cartridge and a developing cartridge are mounted in an image forming apparatus according to an embodiment of the present invention. The top view of the collection member vicinity which concerns on the Example of this invention The figure which shows arrangement | positioning of the collection member which concerns on the Example of this invention. The top view of the collection member which concerns on the Example of this invention Sectional drawing which shows the collection member and developing blade which concern on the Example of this invention

[Example]
[Overall schematic configuration of image forming apparatus]
(Overall configuration of image forming apparatus)
First, an overall configuration of an electrophotographic image forming apparatus (hereinafter, image forming apparatus) 100 will be described with reference to FIG. As shown in FIG. 2, the image forming apparatus 100 includes four detachable drum cartridges 26 (26a, 26b, 26c, 26d) and four developing cartridges 4 (4a, 4b, 4c, 4d). A main body (hereinafter referred to as an apparatus main body) 10 is mounted and configured. The upstream side in the mounting direction of the image forming apparatus 100 of the drum cartridge 26 and the developing cartridge 4 is defined as the front side surface, and the downstream side in the mounting direction is defined as the back side surface side. In FIG. 2, the drum cartridge 26 and the developing cartridge 4 are provided in the apparatus main body 10 so as to be inclined with respect to the horizontal direction. In FIG. 2, the drum cartridge 26 and the developing cartridge 4 are arranged in the apparatus main body 10 so as to be inclined with respect to the horizontal direction.

  As shown in FIG. 3, each drum cartridge 26 is integrated with an electrophotographic photosensitive member (hereinafter referred to as a photosensitive drum) 1, a charging roller 2 around the photosensitive drum 1, and process means such as a cleaning member 6. Is arranged.

  Further, as shown in FIG. 4, process means such as a developer carrier (hereinafter referred to as a developing roller) 25 and a regulating member (hereinafter referred to as a developing blade) 35 are integrally disposed in each developing cartridge 4.

  The charging roller 2 uniformly charges the surface of the photosensitive drum 1, and the developing roller 25 develops a latent image formed on the photosensitive drum 1 with a developer (hereinafter referred to as toner) to form a visible image. It is to become. The cleaning member 6 removes the toner remaining on the photosensitive drum 1 after the toner image formed on the photosensitive drum 1 is transferred to a recording medium.

  As shown in FIG. 2, a scanner unit for selectively exposing the photosensitive drum 1 below the drum cartridge 26 and the developing cartridge 4 based on image information and forming a latent image on the photosensitive drum 1. 3 is provided.

  A cassette 17 containing a recording medium S is attached to the lower part of the scanner unit 3. A recording medium transport unit is provided so that the recording medium S is transported above the apparatus main body 10 through the secondary transfer roller 69 and the fixing unit 74. Specifically, a feeding roller 54 that separates and feeds the recording medium S in the cassette 17 one by one, a conveying roller 76 that conveys the fed recording medium S, and a latent image formed on the photosensitive drum 1. A registration roller 55 for synchronizing with the recording medium S is provided. On the other hand, an intermediate transfer unit 5 is provided above the drum cartridge 26 as intermediate transfer means for transferring a toner image formed on each photosensitive drum 1. The intermediate transfer unit 5 includes a driving roller 56, a driven roller 57, a primary transfer roller 58 (58a, 58b, 58c, 58d) at a position facing the photosensitive drum 1 of each color, and a position facing the secondary transfer roller 69. The transfer belt 9 is stretched over a counter roller 59.

  When forming an image, each photosensitive drum 1 is rotated, and the photosensitive drum 1 uniformly charged by the charging roller 2 is selectively exposed from the scanner unit 3. Thereby, an electrostatic latent image is formed on the photosensitive drum 1. The latent image is developed by the developing roller 25. As a result, each color toner image is formed on each photosensitive drum 1. The transfer belt 9 circulates and moves so as to face and be in contact with all the photosensitive drums 1 and applies a voltage to the primary transfer roller 58 to perform primary transfer from the photosensitive drum 1 onto the transfer belt 9. . The toner on the transfer belt 9 is transferred to the recording medium S by applying a voltage to the opposing roller 59 and the secondary transfer roller 69 disposed in the transfer belt 9.

  In synchronization with this image formation, the registration roller 55 conveys the recording medium S to the secondary transfer position where the opposing roller 59 and the secondary transfer roller 69 are in contact with each other with the transfer belt 9 interposed therebetween. Then, each color toner image on the transfer belt is secondarily transferred to the recording medium S by applying a transfer bias voltage to the secondary transfer roller 69. As a result, a color image is formed on the recording medium S. The recording medium S on which the color image is formed is heated and pressed by the fixing unit 74 to fix the toner image. Thereafter, the recording medium S is discharged to the discharge unit 75 by the discharge roller 72.

(Drum cartridge)
Next, the drum cartridge 26 embodying the present invention will be described in detail with reference to FIG. FIG. 3 is a cross-sectional view of the drum cartridge 26. The drum cartridges 26a, 26b, 26c, and 26d have the same configuration.

  The photosensitive drum 1 is rotatably provided on the cleaning frame 27 of the drum cartridge 26 via a drum front bearing and a drum back bearing (not shown). A drum coupling and a flange are provided on one end side in the axial direction (longitudinal direction) of the photosensitive drum 1.

  As described above, the charging roller 2 and the cleaning member 6 are provided around the photosensitive drum 1. The cleaning member 6 includes an elastic member 7 formed of a rubber blade and a cleaning support member 8. The tip 7 a of the rubber blade 7 is disposed in contact with the rotation direction of the photosensitive drum 1 in the counter direction. The residual toner removed from the surface of the photosensitive drum 1 by the cleaning member 6 falls into the removed toner chamber 27a. Further, a squeeze sheet 21 that prevents the removed toner in the removed toner chamber 27 a from leaking is attached to the cleaning frame 27 and is in contact with the photosensitive drum 1. Then, by transmitting the driving force of a main body driving motor (not shown) as a driving source to the drum cartridge 26, the photosensitive drum 1 is rotationally driven according to the image forming operation. The charging roller 2 is rotatably attached to the drum cartridge 26 via the charging roller bearing 28, and is pressurized toward the photosensitive drum 1 by the charging roller pressing member 46 and is driven to rotate by the photosensitive drum 1. To do.

(Developer cartridge)
Next, the developing cartridge 4 will be described in detail with reference to FIG. FIG. 4 is a cross-sectional view of the developing cartridge 4 containing toner. The developing cartridge 4a containing yellow toner, the developing cartridge 4b containing magenta toner, the developing cartridge 4c containing cyan toner, and the developing cartridge 4d containing black toner have the same configuration. .

  The developing cartridge 4 supports the developing roller 25, the toner supply roller 34 that rotates in contact with the developing roller 25, the developing blade 35 for regulating the toner layer on the developing roller 25, the toner conveying member 36, and these. The developing frame 31 is made up of.

  The developing frame 31 includes a developing chamber 31f in which the developing roller 25 and the toner supply roller 34 are disposed, and a toner storage chamber 31a provided below the developing chamber 31f. Each chamber is a partition wall 31d. It is partitioned by. The partition wall 31d is provided with an opening 31b through which the toner passes when the toner is transported from the toner storage chamber 31a to the developing chamber 31f.

  The developing roller 25 and the toner supply roller 34 are rotatably supported by the developing frame 31 through a pre-development bearing and a developing back bearing (not shown) that are provided on both sides in the developing roller axial direction. Yes. The developing roller 25 is rotatable in the direction of arrow B in contact with the photosensitive drum 1. Here, the developing blade 35 is configured to include a restricting portion 35 a that is brought into contact with the developing roller 25, and a support portion 35 b that supports the restricting portion 35 a and is fixed to the developing frame 31. It is arranged vertically below.

  The toner storage chamber 31a of the developing frame 31 is provided with a toner transport member 36 that rotates in the direction of arrow E, stirs the stored toner, and transports the toner to the development chamber 31f through the opening 31b. It has been.

(Configuration in which a drum cartridge and a developing cartridge are inserted and mounted in the image forming apparatus)
Next, a configuration in which the drum cartridge 26 and the developing cartridge 4 are inserted into the apparatus main body 10 of the image forming apparatus 100 will be described with reference to FIG. In the present embodiment, the drum cartridge 26 and the developing cartridge 4 are inserted from the opening 101 toward the front side to the back side (direction parallel to the axial direction of the photosensitive drum 1) indicated by the arrow F in the drawing. It is the composition to do. In this embodiment, the upstream side in the insertion direction of the drum cartridge 26 and the developing cartridge 4 is defined as the front side, and the downstream side is defined as the back side.

  The apparatus main body 10 is provided with a main body mounting upper guide portion 103 which is a first main body guide portion on the vertical upper side, and a main body mounting lower guide portion 102 which is a second main body guide portion on the vertical lower side. ing. The main body mounting upper guide portion 103 and the main body mounting lower guide portion 102 each have a guide shape extending along the insertion direction F of the drum cartridge 26. The drum cartridge 26 is placed on the front side of the main body mounting lower guide portion 102 in the mounting direction, and is moved along the main body mounting upper guide portion 103 and the main body mounting lower guide portion 102 in the insertion direction F to the apparatus main body 10. The drum cartridge 26 is inserted.

  The case where the developing cartridge 4 is inserted is the same as that of the drum cartridge 26. The apparatus main body 10 is provided with a main body mounting upper guide 105 on the vertical upper side and a main body mounting lower guide 104 on the vertical lower side. The developing cartridge 4 is placed on the front side of the main body mounting lower guide 104 in the mounting direction, and is moved along the main body mounting upper guide portion 105 and the main body mounting lower guide portion 104 in the insertion direction F to move the drum cartridge to the apparatus main body 10. 26 is inserted.

  Next, the structure of the collecting member of the developing cartridge 4 in the embodiment according to the present invention will be described with reference to FIG. 1, FIG. 6, FIG. 7, and FIG.

FIG. 1 is a cross-sectional view relating to a collecting member configuration for preventing leakage of toner scattered from a developing blade. 6 is a plan view seen from A of FIG. FIG. 7 is a schematic configuration diagram of the collecting member, and FIG. 8 is a plan view seen from B in FIG. FIG. 9 is a cross-sectional view showing the collecting member and the developing blade.
As shown in FIGS. 1 and 7, the collecting member 50 is disposed on the downstream side of the developing blade 35 in the rotational direction (arrow B) of the developing roller 25 and is provided on the developing blade 35.

  The collecting member 50 includes a contact surface 50a, a facing portion 50b, a toner return portion 50c (first portion), and a take-in portion 50d (second portion) in order from the support portion 35b side to the regulating portion 35a side of the developing blade 35. have. The contact surface 50a is fixed directly or indirectly to the developing blade 35 so that toner does not leak between the contact surface 50a and the developing blade 35. In this embodiment, the collecting member 50 is configured such that the contact surface 50a and the developing blade 35 are indirectly fixed with a double-sided tape to suppress toner leakage.

  The opposing portion 50b is connected to the contact surface 50a at one end and the toner return portion 50c at the other end, and a bag path-shaped accommodation portion 51 having an opening between the toner return portion 50c and the developing blade 35 is formed. The toner return portion 50c is disposed such that the other end extends from one end connected to the facing portion 50b toward the developing blade 35, and a gap 50c1 is formed between the other end and the developing blade 35 (accommodating portion entrance). A gap 50c1 between the other end of the toner return portion 50c and the developing blade 35 is a minimum gap between the toner return portion 50c and the developing blade 35. One end of the take-in portion 50d is connected to the toner return portion 50c, the other end extends toward the developing roller 25, and a gap 50d1 larger than the gap 50c1 is formed between the other end and the developing blade 35 (opening portion entrance). ing. In other words, in the present embodiment, the capturing portion 50d of the collecting member 50 has a minimum distance from the developing blade 35 between the opening entrance and the housing entrance so that the width at the housing entrance of the housing 51 is minimized. It is configured non-parallel to the opposing developing blade 35.

  As described above, in this embodiment, the collecting member 50 is arranged vertically above the developing blade 35 so as to overlap with a part of the developing blade 35, and is configured to form the accommodating portion 51. At least a part of the developing blade 35 is disposed vertically below the photosensitive drum 1. As a result, the toner removed from the developing roller 25 by the restricting portion 35a of the developing blade 35 is moved along the developing blade 35 from the restricting portion 35a side of the developing blade 35 toward the support portion 35b, and the accommodating portion. 51 can be stored. Note that it is sufficient that the toner travels on the developing blade 35 and is stored in the storage portion 51. Therefore, at least a part of the developing blade 35 is positioned vertically below the photosensitive drum 1, and one of the developing blades 35 is disposed. The portion may not be positioned vertically below the photosensitive drum 1.

  In the present embodiment, the toner stored in the storage unit 51 is configured such that the toner return portion 50c extends toward the developing blade 35 and the gap 50c1 between the developing blade 35 and the developing blade 35 is reduced. Leakage can be suppressed. However, on the other hand, the take-in portion 50d extends toward the developing roller 25, and a gap 50d1 larger than the gap 50c1 between the toner return portion 50c and the developing blade 35 is provided between the take-in portion 50d and the developing blade 35. did. Accordingly, a large amount of toner can be stored in the storage unit 51 while suppressing leakage of toner from the storage unit 51 to the outside.

  As described above, according to the present exemplary embodiment, unlike the prior art, a sheet member that is slidably contacted with the photosensitive drum can be provided, and the scattered toner can be prevented from leaking to the apparatus main body 10. Therefore, even if the drum cartridge 26 and the developing cartridge 4 are individually removable, the sheet member and the photosensitive drum are not rubbed and are not damaged. Furthermore, since the photosensitive drum is not damaged, it is not necessary to provide a sheet member retracting mechanism, and therefore, it is possible to employ a configuration in which scattered toner does not leak into the apparatus main body 10 without increasing the size of the developing cartridge. .

  In this embodiment, as shown in FIG. 6, the collecting member 50 is used to efficiently store the toner scattered from the end of the regulating portion 35 a of the developing blade 35 that contacts the developing roller 25 in the accommodating portion 51. The recovery surfaces 50f are provided at both ends in the longitudinal direction. In the longitudinal direction (arrow F), the collection surface 50f is larger than the restricting portion 35a, and from the support portion 35b side of the developing blade 35 toward the restricting portion 35a, in the longitudinal direction, from the inside to the outside of the collection member 50. The inclined surface is formed so as to straddle the end of the restricting portion 35a. As a result, the toner removed from the developing roller 25 by the restricting portion 35a at the longitudinal end portion can be moved along the collection surface 50f from the restricting portion 35a side of the developing blade 35 toward the support portion 35b side. Therefore, it can be better stored in the accommodating part 51.

  As shown in FIG. 8, the toner return portion 50 c has an inner wall surface facing the storage portion 51, and the end of the regulating portion 35 a of the developing blade 35 is convex so that the toner stored in the storage portion 51 does not leak. The arc is configured to have a cross section in which a plurality of arcs are connected in the longitudinal direction. When the toner stored in the storage portion 51 moves along the longitudinal direction, the toner hits the toner return portion 50c, and a force from the regulating portion 35a side of the developing blade 35 toward the support portion 35b side is applied to the toner. Can do. As a result, the leakage of toner from the storage unit 51 can be more effectively suppressed.

  In this embodiment, the arcuate shape in which the end portion side of the regulating portion 35a of the developing blade 35 is convex has a cross section connected in the longitudinal direction. However, the present invention is not limited to this. When the toner stored in the container 51 moves along the longitudinal direction, the toner return portion 50c can apply a force from the regulating portion 35a side to the support portion 35b side of the developing blade 35 on the toner at the toner return portion 50c. It may be 50 g. For this reason, the toner return part 50g should just have the cross section which has the unevenness | corrugation continuous in the longitudinal direction. For this reason, the circular arc shape illustrated in FIG. 8 is not specified as a configuration in which a plurality of arc shapes are continuous in the longitudinal direction.

  In addition, in the present embodiment, the collecting member 50 is provided with a rib 50e that protrudes in a direction away from the developing blade 35 from the end of the taking-in portion 50d on the developing roller 25 side. More specifically, a rib 50e extending toward the photosensitive drum 1 from the end on the developing roller 25 side of the take-in portion 50d is provided. Even when the toner removed by the regulating portion 35a of the developing blade 35 is scattered on the photosensitive drum 1 by the rib 50e of the collecting member 50, a larger amount of toner can be stored in the accommodating portion 51 better.

  Note that a member having a certain strength, such as a sheet metal, is used for the support portion 35b of the developing blade 35 in order to support the regulating portion 35a. Therefore, in the present embodiment, a sheet metal is used as the support portion 35b. Accordingly, the collecting member 50 covers the covering portion 50h so as to cover the supporting portion 35b of the developing blade 35 so that the light emitted from the scanner unit 3 is not reflected on the supporting portion 35b and exposes the photosensitive drum 1. Provided.

  For example, in the above-described embodiment, the collecting member 50 is indirectly fixed to the developing blade 35 using a double-sided tape to suppress toner leakage. However, the present invention is not limited to this, and the collecting member 50 and the developing blade 35 may be fixed with a bond or hot melt. Further, the collecting member 50 and the developing blade 35 may be in pressure contact with a screw or the like, and may be in direct contact without interposing an adhesive member. Thus, the above-described embodiment can be variously modified within the scope of the present invention.

1, 1a, 1b, 1c, 1d Photosensitive drum 2, 2a, 2b, 2c, 2d Charging roller 4, 4a, 4b, 4c, 4d Developing cartridge 6, 6a, 6b, 6c, 6d Cleaning member 7 Elastic member 8 Cleaning Support member 9 Transfer belt 17 Cassette 25, 25a, 25b, 25c, 25d Developing roller 26, 26a, 26b, 26c, 26d Drum cartridge 27 Cleaning frame 31 Developing container 34 Toner supply roller 35 Developing blade 40 Seal member 50 Collecting member 70 Process cartridge 100 Image forming apparatus 101, 101a, 101b, 101c, 101d Opening 102, 102a, 102b, 102c, 102d Main body mounting lower guide 103, 103a, 103b, 103c, 103d Main body mounting upper guide 104, 10 a, 104b, 104c, 104d body mounted under guide 105,105a, 105b, 105c, 105d body mounted on the guide

Claims (6)

A developing cartridge that is detachably attached to the image forming apparatus main body and supplies a developer to the electrophotographic photosensitive member,
A developer carrier for supplying a developer to the electrophotographic photoreceptor;
A developing frame that rotatably supports the developer carrying;
A regulating member fixed to the developing frame, at least partly disposed vertically below the developer carrier, and regulating the developer on the developer carrier;
Have
A collecting member disposed vertically above the regulating member so as to overlap a part of the regulating member;
The collecting member is
A facing portion that faces the regulating member and forms a housing portion that houses the developer between the regulating member;
A first portion extending from one end connected to the facing portion toward the regulating member;
One end is connected to the other end of the first part and extends toward the developer carrier, and the other end has a gap between the restriction member and a minimum gap between the restriction member and the other end of the first part. Compared to the second part,
A developing cartridge comprising:   The developing cartridge according to claim 1, wherein the collecting member has a rib protruding in a direction away from the restricting member from the other end of the second portion. The restricting member has a restricting portion that contacts the developer carrier, and a support portion that supports the restricting portion,
The collecting member has a surface inclined at an end portion in a longitudinal direction of the developer carrier from the outside of the housing portion toward the inside from the regulating portion side to the supporting portion side of the regulating member. The developing cartridge according to claim 1, wherein: The restricting member has a restricting portion that contacts the developer carrier, and a support portion that supports the restricting portion,
The first part has a cross section in which a plurality of shapes protruding from the support part side to the restriction part side of the restriction member are arranged along a longitudinal direction of the developer carrier. Item 4. The developing cartridge according to any one of Items 1 to 3.   The developing cartridge according to claim 4, wherein the shape is an arc shape. The restricting member has a restricting portion that comes into contact with the developer carrying member, and a support portion made of a sheet metal that supports the restricting portion,
The developing cartridge according to claim 1, wherein the collecting member includes a covering portion that covers the support portion.

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