JP7483847B2 - Developing cartridge - Google Patents

Description

The present invention relates to a developing cartridge for use in an image forming device.

In electrophotographic image forming devices such as laser beam printers and copiers, a toner image is formed on a photosensitive member, and this toner image is transferred to a recording material such as paper to form an image on the recording material. In such image forming devices, a method is widely adopted in which some of the parts of the image forming device are provided in a cartridge to facilitate maintenance, and the cartridge is removed from the main body of the device for maintenance and replacement. Patent Document 1 discloses a process cartridge in which a developing unit that contains toner as a developer can be detachably attached to a photosensitive unit having a photosensitive member.

JP 2016-224221 A

If the photoconductor unit's life span is extended, the paper dust and toner removed from the surface of the photoconductor drum may overflow from the storage section that stores the dust and toner, causing dirt on the surrounding area or adhering to the photoconductor drum, developing roller, transfer roller, etc., resulting in defective images and other problems.

The present invention aims to solve the above problems, and its purpose is to provide a developing cartridge that can prevent paper dust, toner, etc. from overflowing from a storage section that stores paper dust, toner, and other adhering matter removed from the surface of a photosensitive drum.

A typical configuration of a developing cartridge according to the present invention for achieving the above-mentioned object is a developing cartridge having a frame body provided with a storage section for storing toner and an opening leading to the storage section , a developing roller arranged outside the storage section facing the opening and configured to rotate while carrying toner, a supply roller configured to contact the developing roller and supply the toner stored in the storage section to the developing roller through the opening, a regulating member configured to contact the developing roller and regulate the thickness of the layer of toner carried on the surface of the developing roller, and a sheet member, wherein the sheet member is provided only at the end of the developing cartridge in the direction of the rotational axis of the developing roller, and the free end of the sheet member faces a second surface area of the developing roller opposite to a first surface area facing the opening, so as not to come into contact with the second surface area exposed to the outside of the developing cartridge.

The present invention can prevent paper dust, toner, etc. from overflowing from a storage section that stores paper dust, toner, and other adhering matter removed from the surface of a photosensitive drum.

FIG. 1 is a cross-sectional view showing a configuration of an image forming apparatus. FIG. 2 is a cross-sectional view illustrating a configuration of the process cartridge according to the first embodiment. FIG. 2 is a perspective view illustrating a configuration of a photoconductor unit according to the first embodiment. FIG. 2 is a perspective view of the photoconductor unit according to the first embodiment, as viewed obliquely from above on the front side. FIG. 11 is a cross-sectional view illustrating a configuration of a portion of a process cartridge according to a second embodiment. FIG. 11 is a cross-sectional view illustrating a configuration of a portion of a process cartridge according to a third embodiment.

One embodiment of the process cartridge and developing cartridge according to the present invention will be specifically described with reference to the drawings. Note that in the following description, the functions, materials, shapes, relative arrangements, etc. of the components are not intended to limit the scope of the invention to those alone, unless otherwise specified.

First Embodiment
The configuration of a first embodiment of a process cartridge 5 and a developing cartridge according to the present invention will be described with reference to Figures 1 to 4. Figure 1 is a cross-sectional view showing the configuration of an electrophotographic image forming apparatus 1. In the following description, directions are defined based on the user who uses the image forming apparatus 1 shown in Figure 1. In other words, the front side of the image forming apparatus 1 is referred to as "front", the back side as "rear", the top side as "upper", and the bottom side as "lower".

In addition, when the image forming apparatus 1 is viewed from the front side (the right side in FIG. 1), the left side of the image forming apparatus 1 is defined as the "left" and the right side is defined as the "right". The process cartridge 5 used in the image forming apparatus 1 is also defined in the same direction as the image forming apparatus 1, assuming that the process cartridge 5 has the same posture as when it is installed in the image forming position of the image forming apparatus 1.

Each direction in each drawing is defined by the arrows shown on the drawing. The front-to-back, up-down, and left-to-right directions indicated by these arrows are perpendicular to each other. These directions are the same in all drawings. The up-down direction is parallel to the vertical direction, and the left-to-right and front-to-back directions are parallel to the horizontal direction.

The left-right direction is parallel to the rotation axis of the photosensitive drum 61, which is an image carrier, and the rotation axis of the developing roller 71, which serves as a developer carrier that supplies toner to the photosensitive drum 61. The developing unit 7 is attached to the photosensitive unit 6 and integrated into one unit, which is called a process cartridge 5. The insertion direction (mounting direction) S1 and removal direction S2 when mounting this process cartridge 5 in the device main body 2 are parallel to the front-rear direction and perpendicular to the left-right direction and the up-down direction.

<Image forming apparatus>
Fig. 1 is a cross-sectional view of the image forming apparatus 1 with a process cartridge 5 attached at the image forming position. The cross section of Fig. 1 is parallel to the up-down direction and the front-rear direction of the image forming apparatus 1. As shown in Fig. 1, the image forming apparatus 1 has a feeding section 3 for feeding a recording material 9 such as paper into an apparatus main body 2. Furthermore, the image forming apparatus 1 has an exposure device 4 as an exposure means, and a process cartridge 5 for transferring a toner image as a developer image onto the recording material 9. Furthermore, the image forming apparatus 1 has a fixing device 8 as a fixing means for thermally fixing the toner image transferred onto the recording material 9.

<Feeding section>
The feeding section 3 is provided at the bottom inside the apparatus main body 2, and includes a feeding tray 31, a feeding roller 32, and a separation roller 33. The recording material 9 stored in the feeding tray 31 is fed by the feeding roller 32 and separated one by one by the separation roller 33. Then, the recording material 9 is conveyed by the conveying roller 34. The leading end of the recording material 9 conveyed by the conveying roller 34 is abutted against a nip portion of the stopped registration roller 35, and skew is corrected. Then, the recording material 9 is conveyed toward a transfer nip portion N formed by a photosensitive drum 61 provided in the process cartridge 5 and a transfer roller 63 as a transfer means.

<Exposure Equipment>
The exposure device 4 is disposed at the upper part of the apparatus main body 2, and includes a laser emission unit, a polygon mirror, a lens, a reflecting mirror, etc. (not shown). A laser beam based on image data emitted from the laser emission unit of the exposure device 4 is scanned at high speed on the uniformly charged surface of the photosensitive drum 61. This exposes the surface of the photosensitive drum 61, and an electrostatic latent image according to the image data is formed on the surface of the photosensitive drum 61.

<Image Forming Operation>
Next, the image forming operation by the process cartridge 5 will be described with reference to Fig. 1. During the image forming process, the photosensitive drum 61 is rotated clockwise in Fig. 1. First, the surface of the photosensitive drum 61 is uniformly charged by the charging device 62, and then exposed to laser light corresponding to image data emitted from the exposure device 4, thereby forming an electrostatic latent image corresponding to the image data on the surface of the photosensitive drum 61.

On the other hand, the toner 11 in the toner storage section 74 is stirred by the second stirring member 75b and the first stirring member 75a, and then supplied to the developing roller 71 via the supply roller 72. The toner 11 supplied to the developing roller 71 then enters between the developing roller 71 and the layer thickness regulating blade 73 and is carried on the surface of the developing roller 71 as a thin layer of a constant thickness.

The toner 11 carried on the surface of the developing roller 71 is supplied to the electrostatic latent image formed on the surface of the photosensitive drum 61. As a result, the toner 11 adheres to the electrostatic latent image formed on the surface of the photosensitive drum 61, making it visible, and it is developed as a toner image on the surface of the photosensitive drum 61. After that, the recording material 9 is transported to the transfer nip portion N formed between the photosensitive drum 61 and the transfer roller 63, and the toner image on the surface of the photosensitive drum 61 is transferred onto the recording material 9.

The fixing device 8 is disposed behind the process cartridge 5 and includes a heating roller 81 and a pressure roller 82. When the recording material 9 onto which the toner image has been transferred passes through the fixing device 8, the recording material 9 carrying the toner image is heated and pressurized between the heating roller 81 and the pressure roller 82, and the toner image is fixed onto the recording material 9. After passing through the fixing device 8, the recording material 9 is transported by transport rollers 12 and 13, and then discharged onto the discharge tray 22 by the discharge rollers 14.

<Recovery of Residual Toner after Transfer>
The toner 11 remaining on the surface of the photosensitive drum 61 without being transferred to the recording material 9 during transfer is collected and reused in the toner storage section 74 of the developing unit 7. Specifically, the surface of the photosensitive drum 61 is once charged by the charging device 62, and the surface potential of the photosensitive drum 61 is made higher than the potential of the developing roller 71. As a result, the residual toner positively charged on the surface of the photosensitive drum 61 moves to the developing roller 71 and is collected from the surface of the developing roller 71 into the toner storage section 74.

<Process cartridge>
Next, the configuration of the process cartridge 5 will be described with reference to Figures 1 and 2. Figure 2 is a cross-sectional view showing the configuration of the process cartridge 5 of this embodiment. The process cartridge 5 shown in Figure 2 includes a photoconductor unit 6 and a developing unit 7 that is detachable from the photoconductor unit 6.

As shown in FIG. 1, the process cartridge 5 is disposed below the exposure device 4. The process cartridge 5 is attached to the device body 2 by being inserted in an insertion direction S1 into the storage section 23 of the device body 2 through an opening 10 that is created when a door 21 serving as an opening/closing member provided on the device body 2 is opened to the position shown by the two-dot chain line in FIG. 1. When removing the process cartridge 5 from the device body 2, the process cartridge 5 is removed by moving it in a removal direction S2 through the opening 10 with the door 21 serving as an opening/closing member provided on the device body 2 opened to the position shown by the two-dot chain line in FIG. 1.

<Photoconductor unit>
Next, the configuration of the photoconductor unit 6 of this embodiment will be described with reference to Figures 2, 3, and 4. Figure 3 is a perspective view showing the configuration of the photoconductor unit 6 of this embodiment. Figure 4 is a perspective view of the photoconductor unit 6 of this embodiment, seen obliquely from above the front side. As shown in Figure 2, the photoconductor unit 6 used in the image forming apparatus 1 includes a photoconductor drum 61 as an image carrier, a charging device 62 as a charging means, a transfer roller 63 as a transfer means, and a paper dust removing device 110 as a cleaning means.

The photosensitive unit 6 has a photosensitive drum 61 and second contact members 180a, 180b. The second contact members 180a, 180b are configured as sheet members that contact the surface of the photosensitive drum 61 at the ends in the direction of the rotation axis of the photosensitive drum 61 and remove toner 11 and other deposits that have adhered to the surface of the photosensitive drum 61. The photosensitive unit 6 is configured as a photosensitive cartridge.

The photosensitive unit 6 has a photosensitive frame 610 that supports various elements within the photosensitive unit 6 and has a pair of left side walls 611 and right side walls 612. The photosensitive frame 610 is provided with a rotatable photosensitive drum 61, a transfer roller 63 that rotates in contact with the underside of the photosensitive drum 61, and a charging device 62 that faces the upper side of the photosensitive drum 61. A gear 65 is provided at one end of the photosensitive drum 61 in the direction of its rotation axis, and the gear 65 meshes with a transfer gear 66 that transmits drive to the transfer roller 63.

The photosensitive frame 610 is provided with the paper dust removing device 110 and a gripping portion 617 with which the user grips the photosensitive unit 6. The photosensitive frame 610 is further provided with an attachment portion 615 in which the developing unit 7 can be attached, a pressing member 640 that presses the developing unit 7, and a lift member 642 that lifts the developing unit 7.

The pressing member 640 presses the developing unit 7 attached to the photosensitive unit 6, thereby urging the developing roller 71 toward the photosensitive drum 61. The lift member 642 can be operated by the user to remove the developing unit 7 from the photosensitive unit 6 and replace it.

<Paper dust removal device>
2, the paper powder removing device 110 includes a frame 170, a first removing roller 120, a second removing roller 130, an elastic member 140, and a first contact member 160. The first contact member 160 includes a support portion 161 supported by the frame 170, and a contact portion 162 that contacts the surface of the photosensitive drum 61.

The first removal roller 120 rotates in contact with the rear side of the photosensitive drum 61, and collects paper dust adhering to the surface of the photosensitive drum 61. The second removal roller 130 rotates in contact with the rear side of the first removal roller 120, and adsorbs the paper dust on the first removal roller 120. The elastic member 140 contacts the upper peripheral surface of the second removal roller 130, and scrapes off the paper dust on the second removal roller 130.

The first contact member 160 is configured to have a support portion 161, one end of which is fixed to the frame 170, and a fibrous contact portion 162 that contacts the photosensitive drum 61. The first contact member 160 allows the toner 11 remaining on the surface of the photosensitive drum 61 to pass through, while collecting paper dust on the surface of the photosensitive drum 61 that was not completely removed by the first removal roller 120.

<Developing unit>
The developing unit 7 is configured as a developing cartridge that is detachably mounted to the photoconductor unit 6. The developing unit 7 is formed by a developing frame 700, and has a toner storage portion 74 that stores toner 11 as a developer. The developing unit 7 further has a first stirring member 75a and a second stirring member 75b that stir the toner 11 stored in the toner storage portion 74 and transport the toner 11 to the supply roller 72.

The developing unit 7 further includes a supply roller 72 that supplies the toner 11, which serves as a developer and is contained in a toner container 74, to the developing roller 71. The developing unit 7 further includes a developing roller 71, which serves as a developer carrier and rotates in contact with the photosensitive drum 61. The developing unit 7 further includes a layer thickness regulating blade 73 that regulates the layer thickness of the toner 11 carried on the surface of the developing roller 71. The supply roller 72 rotates in contact with the developing roller 71.

The toner 11 contained in the toner container 74 is conveyed toward the supply roller 72 while being stirred by the rotation of the first stirring member 75a and the second stirring member 75b. The toner 11 is then conveyed toward the developing roller 71 by the supply roller 72, and is attracted by the magnetic force of the magnet roller embedded inside the developing roller 71 and carried on the surface of the developing roller 71. The layer thickness of the toner 11 carried on the surface of the developing roller 71 is regulated by the layer thickness regulating blade 73. The developing frame 700 supports various elements in the developing unit 7. The developing roller 71 is rotatably supported by the developing frame 700 at both ends in the direction of its rotation axis. A gripping portion 701 that the user can grip is provided in front of the developing unit 7.

<Storage section>
Next, the configuration of the storage section will be described with reference to Figures 3 and 4. Figure 4 is a perspective view of the photosensitive unit 6 as seen from diagonally above the front side. The photosensitive frame 610 of the photosensitive unit 6 shown in Figures 3 and 4 is provided with second contact members 180a and 180b as sheet members. The second contact members 180a and 180b contact the surface of the photosensitive drum 61 at one end side and the other end side as ends in the rotation axis direction of the photosensitive drum 61, and remove paper powder and toner 11 as deposits attached to the surface of the photosensitive drum 61.

The photosensitive frame 610 of the photosensitive unit 6 is provided with storage sections 613a, 613b for storing paper dust and toner 11 as adhesions removed from the surface of the photosensitive drum 61 by the second contact members 180a, 180b as sheet members. When the photosensitive unit 6 is disposed at the image forming position, the storage sections 613a, 613b are provided vertically below the second contact members 180a, 180b as sheet members at one end side and the other end side in the rotation axis direction of the photosensitive drum 61. The storage sections 613a, 613b are provided in positions facing the areas of the photosensitive drum 61 where the second contact members 180a, 180b as sheet members abut.

The second contact members 180a and 180b remove toner 11 that adheres to the surface of the photosensitive drum 61 outside the left-right direction of the developing roller 71 and that could not be collected by the developing unit 7. The second contact members 180a and 180b remove paper dust that adheres to the surface of the photosensitive drum 61 outside the left-right direction of the first contact member 160.

A gear 65 is provided at the end of the photosensitive drum 61 on the side where the storage section 613a is located in the direction of the rotation axis of the photosensitive drum 61. The storage section 613a on the left end side in FIG. 4, which is one end side in the direction of the rotation axis of the photosensitive drum 61, extends from outside the gear 65 to inside one end face 61a of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61. In addition, the storage section 613b on the right end side in FIG. 4, which is the other end side in the direction of the rotation axis of the photosensitive drum 61, extends from outside to inside the other end face 61b of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61.

By ensuring a large capacity for the storage sections 613a and 613b in this way, it is possible to prevent the paper dust and toner 11 as adhesions from overflowing from the storage sections 613a and 613b even if the photoconductor unit 6 has a long life. This makes it possible to prevent the overflowing paper dust and toner 11 as adhesions from contaminating the surrounding area, or the overflowing paper dust and toner 11 as adhesions from adhering to the photoconductor drum 61, developing roller 71, transfer roller 63, etc., causing problems such as poor images.

In this embodiment, the storage sections 613a and 613b are provided on both sides of the photosensitive drum 61 in the direction of the rotation axis, but the same effect can be obtained by providing a storage section only on one side of the photosensitive drum 61 in the direction of the rotation axis.

Second Embodiment
Next, the configuration of a second embodiment of the process cartridge according to the present invention will be described with reference to Fig. 5. Components configured similarly to those in the first embodiment will be given the same reference numerals, or even if the reference numerals are different, the same component names will be used and description will be omitted. Fig. 5 is a cross-sectional view showing a partial configuration of the process cartridge 5 of this embodiment. In the first embodiment, the second contact members 180a, 180b and the storage portions 613a, 613b serving as sheet members are provided in a part of the photosensitive frame 610 of the photosensitive unit 6.

In this embodiment, second contact members 180a, 180b are provided as sheet members on the photosensitive frame 610 of the photosensitive unit 6. Furthermore, this is an example in which storage sections 702a, 702b are provided on the developing frame 700 of the developing unit 7 to store paper powder and toner 11 as adhesions removed by the second contact members 180a, 180b provided on the photosensitive frame 610 of the photosensitive unit 6.

The process cartridge 5 used in the image forming device 1 is configured to have a photosensitive unit 6 and a developing unit 7 that is detachable from the photosensitive unit 6. The photosensitive unit 6 has a photosensitive drum 61 and a gear 65 provided at one end of the photosensitive drum 61 in the direction of the rotation axis.

The photosensitive unit 6 further includes second contact members 180a and 180b as sheet members. The second contact members 180a and 180b contact the surface of the photosensitive drum 61 at one end and the other end in the rotational axis direction of the photosensitive drum 61, and remove paper dust and toner 11 as adhesions adhering to the surface of the photosensitive drum 61. The photosensitive unit 6 further includes an attachment section 615 to which the developing unit 7 can be attached. The second contact members 180a and 180b as sheet members are provided on the photosensitive frame 610 of the photosensitive unit 6.

On the other hand, the developing unit 7 has a developing roller 71. Furthermore, the developing unit 7 is configured with storage sections 702a, 702b that store the paper dust and toner 11 as adhering matter removed by the second contact members 180a, 180b. Here, consider the state in which the process cartridge 5 is placed at the image forming position. In this state, the storage sections 702a, 702b are provided vertically below the second contact members 180a, 180b as sheet members at one end side and the other end side in the rotational axis direction of the photosensitive drum 61.

The storage section 702a on one end side of the photosensitive drum 61 in the direction of the rotation axis extends from outside the gear 65 to inside one end face 61a of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61. The storage section 702b on the other end side of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61 extends from outside to inside the other end face 61b of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61. The storage sections 702a and 702b that store the paper powder and toner 11 as adhesions removed by the second abutment members 180a and 180b are provided in the developing frame 700 of the developing unit 7.

The photosensitive frame 610 of the photosensitive unit 6 has cutouts 614a and 614b at positions corresponding to the storage sections 702a and 702b. This allows the paper dust and toner 11 that have accumulated in the storage sections 702a and 702b to be removed every time the developing unit 7 is replaced. This makes it possible to prevent the paper dust and toner 11 that have accumulated in the storage sections 702a and 702b from overflowing from the storage sections 702a and 702b even if the life of the photosensitive unit 6 is further extended compared to the first embodiment.

By ensuring a large capacity for the storage sections 702a and 702b in this way, it is possible to prevent the overflow of paper dust and toner 11 as adhesions from the storage sections 702a and 702b even if the life of the photoconductor unit 6 is further extended. The other configurations are configured in the same way as in the first embodiment, and the same effects can be obtained.

Third Embodiment
Next, the configuration of a third embodiment of the process cartridge according to the present invention will be described with reference to Fig. 6. Note that the same reference numerals are used for components configured similarly to the above-described embodiments, or the same names are used for components even if the reference numerals are different, and the description thereof will be omitted. Fig. 6 is a cross-sectional view showing the configuration of a portion of the process cartridge 5 of this embodiment.

In the second embodiment, the storage portions 702a, 702b were formed in a part of the developing frame 700 of the developing unit 7, and the photosensitive frame 610 of the photosensitive unit 6 was provided with the second abutting members 180a, 180b as sheet members. In this embodiment, the developing frame 700 of the developing unit 7 is provided with the second abutting members 280a, 280b as sheet members, and the storage portions 702a, 702b for storing the paper powder and toner 11 as adhesions removed by the second abutting members 280a, 280b.

The process cartridge 5 used in the image forming device 1 is configured to have a photosensitive unit 6 and a developing unit 7. The photosensitive unit 6 is configured to have a photosensitive drum 61, a gear 65 provided at one end of the photosensitive drum 61 in the direction of the rotation axis, and an attachment portion 615 to which the developing unit 7 can be attached.

On the other hand, the developing unit 7 has a developing roller 71. Furthermore, the developing unit 7 has second contact members 280a, 280b as sheet members that come into contact with the surface of the photosensitive drum 61 at one end side and the other end side in the rotational axis direction of the photosensitive drum 61 and remove paper dust and toner 11 as adhesions adhering to the surface of the photosensitive drum 61.

The developing unit 7 is further configured with storage sections 702a, 702b that store the paper dust and toner 11 as adhering matter removed by the second contact members 280a, 280b. Here, consider the state in which the process cartridge 5 is disposed at the image forming position. In this state, the storage sections 702a, 702b are provided vertically below the second contact members 280a, 280b as sheet members at one end side and the other end side in the rotational axis direction of the photosensitive drum 61.

The storage section 702a on one end side of the photosensitive drum 61 in the direction of the rotation axis extends from outside the gear 65 to inside one end face 61a of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61. On the other hand, the storage section 702b on the other end side of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61 extends from outside to inside the other end face 61b of the photosensitive drum 61 in the direction of the rotation axis of the photosensitive drum 61.

As shown in FIG. 6, the developing frame 700 of the developing unit 7 is provided with second contact members 280a, 280b as sheet members that remove the paper dust and toner 11 as adhesions adhering to the surface of the photosensitive drum 61. Furthermore, the developing frame 700 of the developing unit 7 is provided with storage sections 702a, 702b that store the paper dust and toner 11 as adhesions removed by the second contact members 280a, 280b.

As a result, the second contact members 280a, 280b are also replaced every time the development unit 7 is replaced. This makes it possible to prevent a decrease in the removal performance of removing the paper dust and toner 11 as adhesions adhering to the surface of the photosensitive drum 61 due to wear of the second contact members 280a, 280b, etc., even if the photosensitive unit 6 has a longer life than the second embodiment. In other words, even if the photosensitive unit 6 has a longer life than the second embodiment, it is possible to prevent the paper dust and toner 11 as adhesions from overflowing from the storage sections 702a, 702b. The other configurations are configured in the same way as the above-mentioned embodiments, and the same effects can be obtained.

6...Photosensitive unit (photosensitive cartridge)
7...Developing unit (developing cartridge)
61: photosensitive drum; 71: developing roller; 180a, 180b: second contact member (sheet member)
613a, 613b...storage section

Claims (3)

A developing cartridge,
a frame provided with a container for containing toner and an opening communicating with the container;
a developing roller disposed outside the container so as to face the opening and configured to rotate while carrying toner;
a supply roller configured to contact the developing roller and supply the toner contained in the container to the developing roller through the opening;
a regulating member configured to contact the developing roller and regulate a thickness of a toner layer carried on a surface of the developing roller;
A sheet member;
having
the sheet member is provided only at an end of the developing cartridge in a direction of a rotation axis of the developing roller,
a free end of the sheet member faces a second surface area of the developing roller opposite to a first surface area of the developing roller facing the opening, the second surface area being exposed to the outside of the developing cartridge, so as not to come into contact with the second surface area;
A developing cartridge characterized by: 2. The developing cartridge according to claim 1, wherein the sheet member is provided to contribute to the recovery and storage of the toner. A developing cartridge as described in claim 1 or 2, characterized in that when the end is a first end, the sheet member is also provided at a second end, which is the end opposite the first end in the direction of the rotation axis.

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