Protective cover and developing cartridge assembly

Abstract

The utility model discloses a protective cover and developing box assembly, the developing box includes: developing casing, is used to accommodate developer, developing roller is used to bear developer, and the rotation axis direction of developing roller is the first direction, end cover is located developing casing one end, and support is located the other end. The protective cover includes protective cover main part, first installation part and second installation part. First installation part includes first main part and joint, and joint cooperates with end cover, and second installation part is connected with protective cover main part, has the recess or is closed structure, and forms the joint or the cladding type connection with support. Along the first direction, first installation part and second installation part are opposite and located the both ends of protective cover main part, realize double -end fixed, prevent loose and fall off, and promote developing roller protection reliability.

Description

Technical Field

[0001] This utility model relates to the field of electrophotographic imaging technology, and in particular to a protective cover and a developing cartridge assembly having the protective cover. Background Technology

[0002] A developing cartridge is available, typically detachably installed in an electrophotographic imaging device. The developing cartridge has a developing housing for containing developer and a developing roller rotatably disposed within the developing housing. The developing roller carries the developer and supplies it to a photosensitive drum outside the developing cartridge, thereby developing an electrostatic latent image on the photosensitive drum.

[0003] In existing technologies, the protective covers for developing cartridges typically employ a simple slotted structure fitted onto both ends of the developing cartridge. The fit between these covers and the end caps or supports is relatively loose, making them prone to axial movement or even detachment during transportation, handling, or installation. This fails to effectively protect precision components such as the developing rollers and powder discharge blades. Especially when the protective cover only has a fitting structure at one end and lacks effective restraint at the other, the overall connection stability is poor, making it susceptible to protection failure due to vibration or external forces, affecting the reliability and lifespan of the developing cartridge. Furthermore, existing protective covers often lack directional positioning or foolproof design when connecting to the structures at both ends of the developing cartridge (such as end caps and supports), leading to improper assembly or reverse installation, further reducing protective performance.

[0004] Therefore, there is an urgent need in the existing technology for a protective cover structure that is reliable in connection, stable in assembly, and capable of coordinating fixation at both ends, in order to solve the technical problems of the protective cover being easy to fall off, incomplete protection, and low assembly error tolerance. Utility Model Content

[0005] This utility model provides a protective cover employing the following technical solution and a developing cartridge assembly having the protective cover, in order to solve at least one of the above-mentioned problems.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A protective cover, detachably mounted to a developing cartridge, the developing cartridge being configured to be detachably mounted into an apparatus, the developing cartridge comprising: a developing housing for containing developer; a developing roller rotatably disposed within the developing housing for carrying developer, the direction of the rotation axis of the developing roller being defined as a first direction; an end cap disposed at one end of the developing housing in the first direction, the end cap having an end cap body and a first through hole formed in the end cap body; a developing coupling member exposed through the first through hole, the developing coupling member being used to receive a rotational driving force output from the apparatus to drive the developing roller to rotate; and a bracket disposed at the other end of the developing housing in the first direction, characterized in that: the protective cover includes The protective cover body is used to protect the developing roller; a first mounting part includes a first main body and a connecting part formed on the first main body, the first main body being connected to the protective cover body, and the connecting part being used to cooperate with the end cap; and a second mounting part is connected to the protective cover body and is used to cooperate with the bracket; wherein, along a first direction, the first mounting part and the second mounting part are disposed opposite to each other at both ends of the protective cover body, the second mounting part has a second main body and a groove formed on the second main body, or the second mounting part is configured as a closed structure, and the second mounting part can form a snap-fit ​​or wrap-around connection with the bracket, effectively preventing the protective cover from loosening or detaching at the other end.

[0008] Furthermore, the developing cartridge includes an extension formed around the first through hole, the extension being used to protect the developing coupling component, and the connecting portion and the second mounting portion being configured as a closed structure, the connecting portion being used to cooperate with the extension portion so that the protective cover can be fixed after being installed into the developing cartridge.

[0009] Furthermore, the protective cover also has a first covering portion, a second covering portion, a third covering portion and a fourth covering portion extending from the main body of the protective cover. Along a first direction, the first covering portion and the second covering portion are respectively disposed on both sides of the main body of the protective cover; the third covering portion and the fourth covering portion are disposed opposite to each other along a third direction, and the first direction and the third direction intersect. The covering portion can provide more comprehensive protection for the surface of the developing roller exposed to the outside.

[0010] Furthermore, the developing cartridge includes a powder dispensing blade fixedly mounted on the developing housing. The powder dispensing blade is used to adjust the thickness of the toner layer on the surface of the developing roller. The first covering part and the second covering part can cover the powder dispensing blade, protecting it from being scratched, deformed, or contaminated.

[0011] Furthermore, the protective cover has a functional portion extending from the joint, and the functional portion is provided with a handle portion, which makes it easier for the user to grasp the handle portion, making the disassembly process of the protective cover more convenient and faster.

[0012] Furthermore, the developing cartridge has a fastening member formed on the developing housing or support, and the second mounting portion has a fastening member for engaging with the fastening member. The fastening member is configured as a protrusion, and the fastening member is configured as a groove. The engagement of the protrusion and the groove enhances the connection stability between the two.

[0013] Furthermore, a first fastening part and a second fastening part are provided on both sides of the groove, and the bracket has a bracket body and a fastened part formed on the bracket body. The fastened part is used to cooperate with the first fastening part and the second fastening part, which can enhance the snapping strength between the fastened part and the fastening part.

[0014] Furthermore, the direction intersecting the first direction is the third direction. Along the third direction, the first and second fastening parts are not connected, and the shortest distance between them is less than the diameter of the fastened part, thereby effectively preventing the protective cover from falling off when subjected to vibration or external impact.

[0015] Furthermore, the developing cartridge includes an action mechanism for receiving a separation force applied by the device, and the protective cover also has a clearance portion formed on the side of the protective cover body facing the developing cartridge, the clearance portion for avoiding the action mechanism, thereby effectively preventing interference between the protective cover and the action mechanism.

[0016] This utility model also provides a developing cartridge assembly, characterized in that: it includes a developing cartridge and the protective cover, the developing cartridge is detachably installed in an electrophotographic imaging device, and includes a developing housing and a developing roller rotatably disposed in the developing housing, the protective cover being detachably combined with the developing housing.

[0017] By adopting the above technical solution, the beneficial effects that this utility model can achieve are as follows: The developing cartridge assembly provided by this utility model provides a first mounting part and a second mounting part at both ends of the protective cover, and makes them cooperate with the end cap and bracket of the developing cartridge respectively, thereby realizing the double-end cooperative fixation of the protective cover in the first direction, which significantly improves the stability of the connection and the ability to resist falling off.

[0018] Specifically, the first mounting part cooperates with the end cap through a joint to achieve axial limiting and circumferential positioning; the second mounting part is provided with a groove or has a closed structure, which can form a snap-fit ​​or enveloping connection with the bracket, effectively preventing the protective cover from loosening or detaching at the other end. The differentiated and complementary connection methods at both ends not only enhance the symmetry and stress balance of the overall structure, but also improve assembly accuracy and reliability. Attached Figure Description

[0019] Figure 1A and Figure 1B This is a perspective view of the developing cartridge assembly according to Embodiment 1 of this utility model.

[0020] Figure 1C This is an exploded view of the protective cover and developing cartridge involved in Embodiment 1 of this utility model.

[0021] Figure 1D This is a perspective view of the protective cover involved in Embodiment 1 of this utility model.

[0022] Figure 1E This is a perspective view of the protective cover drive end according to Embodiment 1 of this utility model.

[0023] Figure 1F This is a perspective view of the non-driving end of the developing cartridge according to Embodiment 1 of this utility model.

[0024] Figure 1G This is a perspective view of the non-driving end of the protective cover according to Embodiment 1 of this utility model.

[0025] Figure 2A This is a perspective view of the driver end of the developing cartridge assembly according to Embodiment 2 of this utility model.

[0026] Figure 2B This is a perspective view of the non-driving end of the developing cartridge assembly according to Embodiment 2 of this utility model.

[0027] Figure 2C This is a perspective view of the protective cover involved in Embodiment 2 of this utility model.

[0028] Figure 2D This is a perspective view of the protective cover drive end involved in Embodiment 2 of this utility model.

[0029] Figure 3A This is a perspective view of the driver end of the developing cartridge assembly according to Embodiment 3 of this utility model.

[0030] Figure 3B This is a perspective view of the non-driving end of the developing cartridge assembly according to Embodiment 3 of this utility model.

[0031] Figure 3C This is a perspective view of the protective cover involved in Embodiment 3 of this utility model.

[0032] Figure 3D This is a perspective view of the developing cartridge drive end according to Embodiment 3 of this utility model.

[0033] Figure 3E This is a perspective view of the protective cover drive end involved in Embodiment 3 of this utility model.

[0034] Figure 4A This is a perspective view of the non-driving end of the developing cartridge assembly according to Embodiment 4 of this utility model.

[0035] Figure 4B This is a perspective view of the protective cover involved in Embodiment 4 of this utility model. Detailed Implementation

[0036] The following detailed description, with reference to the accompanying drawings, further illustrates the protective cover and the structure of the developing cartridge assembly with the protective cover, as well as other aspects of this utility model.

[0037] Example 1

[0038] like Figure 1A , Figure 1B and Figure 1C As shown, the developing cartridge assembly 9 includes a developing cartridge 1 and a protective cover 2 for at least partially protecting the developing cartridge 1. The developing cartridge 1 is detachably installed in an electrophotographic imaging device (hereinafter referred to as the "device"). The developing cartridge 1 has a developing housing 10 for containing developer and a developing roller 11 rotatably disposed in the developing housing 10. The developing roller 11 is used to carry the developer and supply the developer to a photosensitive drum outside the developing cartridge 1, so as to develop the electrostatic latent image on the surface of the photosensitive drum. The developing cartridge 1 also has a toner discharge blade 16 fixedly disposed on the developing housing 10. The toner discharge blade 16 is used to adjust the thickness of the toner layer on the surface of the developing roller 11. The protective cover 2 is detachably installed on the developing housing 10.

[0039] To make the following description clearer, such as Figure 1A , Figure 1B and Figure 1C As shown, the direction of the rotation axis L of the developing roller 11 is defined as the first direction / left-right direction; the direction intersecting with the first direction is defined as the second direction / front-back direction. Along the front-back direction, the end of the developing cartridge 1 on which the developing roller 11 is installed is defined as the front, and the end opposite to the front is defined as the rear; the direction intersecting with the first and second directions is defined as the third direction / up-down direction; the direction of gravity of the developing cartridge 1 is downward, and the end opposite to the downward is upward.

[0040] like Figure 1A As shown, along the first direction, the developing cartridge 1 further includes a developing roller gear 12 coaxially arranged with the developing roller 11, and a developing connecting component 13 disposed at one end of the developing housing 10. The developing connecting component 13 is used to receive the rotational driving force output by the device, thereby directly or indirectly driving the developing roller gear 12 to drive the developing roller 11 to rotate. Along the first direction, the end of the developing cartridge 1 used to receive the driving force from the device is defined as the driving end / left side, and the end opposite to the driving end is defined as the non-driving end / right side.

[0041] like Figure 1A and Figure 1CAs shown, along the first direction, the developing cartridge 1 has an end cap 14 disposed at the driving end of the developing housing 10. The end cap 14 is used to cover at least a portion of the developing roller gear 12. The end cap 14 has an end cap body 140 and a first through hole 141 formed on the end cap body 140. The developing coupling component 13 is exposed through the first through hole 141. The end cap 14 is also provided with an extension 142 extending to the left from the end cap body 140. In other words, the extension 142 extends from the end cap body 140 in a direction away from the developing housing 10. The extension 142 is formed around the first through hole 141 and is used to protect the developing coupling component 13.

[0042] like Figure 1C , Figure 1D and Figure 1E As shown, the protective cover 2 has a protective cover body 20 for protecting the developing roller 11, and a first covering portion 21, a second covering portion 22, a third covering portion 23, and a fourth covering portion 24 extending from the protective cover body 20. Along a first direction, the first covering portion 21 and the second covering portion 22 are respectively disposed on both sides of the protective cover body 20. The third covering portion 23 and the fourth covering portion 24 are disposed opposite each other along a third direction. The protective cover body 20, the first covering portion 21, the second covering portion 22, the third covering portion 23, and the fourth covering portion 24 are integrally formed. The protective cover body 20 is used to cover and protect the developing roller 11. The first covering part 21 is used to cover and protect the part of the developing cartridge 1 located at the drive end, the second covering part 22 is used to cover and protect the part of the developing cartridge 1 located at the non-drive end, the third covering part 23 and the fourth covering part 24 can strengthen the strength of the protective cover body 20, and the first covering part 21, the second covering part 22, the third covering part 23 and the fourth covering part 24 are also used to prevent impurities from entering between the protective cover body 20 and the developing roller 11. The first covering part 21 and the second covering part 22 can also cover the powder discharge knife 16, or the first covering part 21 and the second covering part 22 are located above the powder discharge knife 16.

[0043] like Figure 1B , Figure 1C and Figure 1D As shown, along the first direction, the developing cartridge 1 also has a bracket 15 disposed at the non-driving end of the developing housing 10. The bracket 15 is used to support the developing roller 11. The bracket 15 can also be used to support conductive components or the bracket 15 is made of conductive material to transmit the power output by the device to the developing roller 11.

[0044] The protective cover 2 also includes a first mounting portion 25 and a second mounting portion 26 extending from the protective cover body 20. Along a first direction, the first mounting portion 25 and the second mounting portion 26 are disposed opposite to each other at both ends of the protective cover body 20, and both the first mounting portion 25 and the second mounting portion 26 are connected to the protective cover body 20 and integrally formed. The first mounting portion 25 and the first covering portion 21 are spaced apart, and a first gap 20a is formed between the first mounting portion 25 and the first covering portion 21, so that during the process of installing the protective cover 2 to the developing cartridge 1, the first mounting portion 25 and the first covering portion 21 can undergo elastic deformation, thereby enabling the protective cover 2 to be smoothly installed to the developing cartridge 1.

[0045] The first mounting portion 25 has a first main body portion 250 and a connecting portion 251 formed on the first main body portion 250. The first main body portion 25 is connected to the protective cover body 20. The connecting portion 251 is used to cooperate with the extension portion 142 so that the protective cover 2 can be fixed after being installed into the developing cartridge 1. The connecting portion 251 is not exposed outward along the radial direction of the connecting portion 251, or along the direction perpendicular to the first direction. The connecting portion 251 is set as a closed structure, which can not only protect the developing cartridge 1, but also make the protective cover 2 more stably fixed. The second mounting portion 26 is set as an open slot for cooperating with the bracket 15. When manually installing the protective cover 2, the second mounting portion 26 can be first made to cooperate with the bracket 15, and then rotated around the cooperation point between the second mounting portion 26 and the bracket 15 as a fulcrum, so that the protective cover 2 can be installed smoothly. When automatically installing the protective cover 1, the installation process of the protective cover 2 can also be made smoother and faster.

[0046] In some embodiments, the second mounting portion 26 may also be configured as a closed structure similar to the connecting portion 251, and the second mounting portion 26 is not exposed to the outside in a direction perpendicular to the first direction.

[0047] The developing cartridge 1 also has a fastening member 151 formed on the developing housing 10. The second mounting part 26 has a second main body part 260 and a fastening member 261 formed on the second main body part 260. The fastening member 261 cooperates with the fastening member 151 to further fix the protective cover 2 stably to the developing cartridge 1.

[0048] like Figure 1D and Figure 1EAs shown, the protective cover 2 also has an action portion 2510 extending from the joint portion 251. The action portion 2510 includes a handle portion 252, which facilitates the user to grasp the handle portion 252, making the disassembly process of the protective cover 2 more convenient and faster. The action portion 2510 also includes a guide portion 253 for guiding the installation of the protective cover 2. The guide portion 253 has a guide surface 2531 on the side facing the second mounting portion 26. The guide surface 2531 is inclined relative to the first direction. During the installation of the protective cover 2, the guide surface 2531 and the second mounting portion 26 are inclined together. The extension 142 abuts against the first mounting portion 25, causing it to elastically deform in a direction away from the developing cartridge 1, until the extension 142 engages with the connecting portion 251. At this point, the protective cover 2 is installed. Preferably, the connecting portion 251 is a through hole. When installing the protective cover 2, the guide portion 253 can play a guiding role, making the installation process time-saving and labor-saving. The setting of the guide surface 2531 not only facilitates automated production but also further optimizes the installation process. In this embodiment, at least a portion of the handle portion 252 forms the guide portion 253.

[0049] The handle portion 252 is provided with an anti-slip portion 2521 on the side facing away from the second mounting portion 26. The anti-slip portion 2521 is used to increase the friction between the operator and the handle portion 252. When it is necessary to remove the protective cover 2, the user's hand is less likely to slip and fall off, thereby further improving the operability of removing the protective cover 2. Preferably, the anti-slip portion 2521 is provided with stripes with several evenly spaced intervals.

[0050] In some implementations, such as Figure 1A , Figure 1B , Figure 1C and Figure 1D As shown, the protective cover 1 also has at least one of a first gripping portion 211 disposed on the first covering portion 21 and a second gripping portion 221 disposed on the second covering portion 22. Along a third direction, the first gripping portion 211 extends from the first covering portion 21 and the second gripping portion 221 extends from the second covering portion 22. The first gripping portion 211 and the second gripping portion 221 both have the same function as the handle portion 252.

[0051] Example 2

[0052] like Figure 2A , Figure 2B and Figure 2C As shown, the following will introduce Embodiment 2 of this application. The parts that are the same as those in Embodiment 1 will not be repeated in this embodiment. The difference is that the structure of the protective cover 2 is different.

[0053] like Figure 2AAs shown, the developing cartridge 1 also has a chip holder 143 and a lifting portion 144 formed on the end cap body 140. The chip holder 143 is used to carry chips containing information related to the developing cartridge 1, and the chip holder 143 is fixed relative to the end cap 14. When the developing cartridge 1 is installed in the device, the lifting portion 144 cooperates with the device to lift the chip holder 143, thereby enabling the chip to form a stable electrical connection with the electrical contacts in the device. The protective cover 2 also has an active portion 2510 extending from the connecting portion 251. The active portion 2510 includes a portion extending from the connecting portion 251. The guide portion 253 and the handle portion 252 extending from the guide portion 253 are connected to each other, and the handle portion 252 extends from the guide portion 253 in a direction away from the joint portion 251 to avoid the lifting portion 144 and prevent the protective cover 2 from interfering with the lifting portion 144 when it is installed; the guide portion 253 has a guide surface 2531, which is inclined relative to the first direction with reference to the first direction. The guide portion 253 is provided so that it can play a guiding role when the protective cover 2 is installed.

[0054] In some implementations, such as Figure 2C As shown, the protective cover 1 also has at least one of a first gripping portion 211 disposed on the first covering portion 21 and a second gripping portion 221 disposed on the second covering portion 22. Along a third direction, the first gripping portion 211 extends from the first covering portion 21 and the second gripping portion 221 extends from the second covering portion 22. The first gripping portion 211 and the second gripping portion 221 both have the same function as the handle portion 252.

[0055] like Figure 2B As shown, along the first direction, the developing cartridge 1 also has a bracket 15 connected to the other end of the developing housing 10. The bracket 15 is disposed at the non-drive end and is used to support the developing roller 11. The bracket 15 can also be used to support conductive components or the bracket 15 is made of conductive material to transmit the power output by the device to the developing roller 11. The bracket 15 has a bracket body 150 and a fastening member 151 formed on the bracket body 150. The second mounting portion 26 has a second body portion 260 and a fastening member 261 formed on the second body portion 260. The fastening member 261 cooperates with the fastened member 151 to further securely fix the protective cover 2 to the developing cartridge 1. Along the second direction, the second mounting portion 26 and the second covering portion 22 are spaced apart, and a second gap 20b is formed between the second mounting portion 26 and the second covering portion 22, so that the second mounting portion 26 can generate elastic deformation during the process of installing the protective cover 2 to the developing cartridge 1. Preferably, the fastening member 261 is a protrusion and the fastened member 151 is a groove.

[0056] In some embodiments, the second mounting portion 26 may be configured as an open slot or a closed structure.

[0057] Example 3

[0058] like Figure 3A , Figure 3B and Figure 3C As shown, the following will introduce Embodiment 3 of this application. The parts that are the same as those in Embodiment 1 or Embodiment 2 will not be repeated in this embodiment. The difference is that the structure of the fastening member is different.

[0059] like Figure 3A As shown, the protective cover 2 also has one of a first gripping portion 211 and a second gripping portion 221 extending from the joint portion 251 in a third direction. The first gripping portion 211 and the second gripping portion 221 have the same function as the handle portion 252, and one of them can be selected.

[0060] like Figure 3A and Figure 3B As shown, along the first direction, the developing cartridge 1 further has a bracket 15 connected to the non-drive end of the developing housing 10. The bracket 15 is used to support the developing roller 11. The bracket 15 can also be used to support conductive components, or the bracket 15 is made of conductive material to transmit the power output from the device to the developing roller 11. The bracket 15 has a bracket body 150 and a fastening member 151 formed on the bracket body 150. The fastening member 151 includes a first fastening portion 152 and a second fastening portion 153. The second mounting portion 26 has a second body portion 260 and a second mounting portion 260. The second mounting portion 26 also has fastening members 261 disposed on both sides of the groove 260a formed on the groove 260a. The fastening members 261 include a first fastening portion 262 and a second fastening portion 263 disposed opposite to each other. Along a third direction, the first fastening portion 262 and the second fastening portion 263 are not connected. For example, the first fastening portion 262 and the second fastening portion 263 are disposed at intervals. The first fastening portion 262 is used to cooperate with the first fastened portion 152, and the second fastening portion 263 is used to cooperate with the second fastened portion 153, so as to further fix the protective cover 2 stably to the developing cartridge 1.

[0061] like Figure 3D and Figure 3EAs shown, the developing cartridge 1 also has an action mechanism 17 for receiving at least the separation force applied by the device. When the developing cartridge 1 is installed in the device and when the developing cartridge 1 does not need to be developed, the action mechanism 17 receives the separation force applied by the device to force the developing roller 11 to separate from the photosensitive drum outside the developing cartridge 1. The protective cover 2 also has a clearance portion 27 formed inside the protective cover body 20 (towards the developing cartridge 1). The clearance portion 27 is used to avoid the action mechanism 17 to prevent interference between the protective cover 2 and the action mechanism 17 during the installation of the protective cover 2.

[0062] Example 4

[0063] like Figure 4A and Figure 4B As shown, the following will introduce Embodiment 4 of this application. The parts that are the same as those in the above embodiments will not be repeated in this embodiment. The difference from Embodiment 3 is that the abutment method between the fastening member and the fastened member is different.

[0064] like Figure 4A and Figure 4B As shown, along the first direction, the developing cartridge 1 further has a bracket 15 connected to the non-drive end of the developing housing 10. The bracket 15 is used to support the developing roller 11. The bracket 15 can also be used to support conductive components, or the bracket 15 is made of conductive material to transmit the power output from the device to the developing roller 11. The bracket 15 has a bracket body 150 and a fastening member 151 formed on the bracket body 150. The second mounting portion 26 has a second main body 260 and a groove 260a formed on the second main body 260. The second mounting portion 26 also has a groove 260a provided in the groove 260a. The fastening members 261 on both sides of 60a include a first fastening part 262 and a second fastening part 263 arranged opposite to each other. In the third direction, the first fastening part 262 and the second fastening part 263 are not connected. For example, the first fastening part 262 and the second fastening part 263 are arranged at intervals. Both the first fastening part 262 and the second fastening part 263 are used to cooperate with the fastened part 151. In the third direction, the shortest distance between the first fastening part 262 and the second fastening part 263 is less than the diameter of the fastened part 151, further making the protective cover 2 stably fixed to the developing cartridge 1.

[0065] As described above, the handle 252 makes the disassembly of the protective cover 2 faster, shortens the disassembly time and facilitates operation; when installing the protective cover 2, the guide 253 can play a guiding role, making the installation process of the protective cover 2 time-saving and labor-saving; the joint 251 and the fastener 261 make the protective cover 2 more securely installed on the developing cartridge 1.

Claims

1. A protective cover, detachably mounted to a developing cartridge, the developing cartridge being configured to be detachably mounted into the device, the developing cartridge comprising: The developer housing is used to contain the developer. A developing roller, rotatably disposed in a developing housing, is used to carry the developing agent, and the direction in which the axis of rotation of the developing roller extends is defined as a first direction; An end cap is disposed at one end of the developing housing in a first direction, the end cap having an end cap body and a first through hole formed on the end cap body; The developing coupling component is exposed through the first through hole, and the developing coupling component is used to receive the rotational driving force output by the device to drive the developing roller to rotate; and A support, disposed at the other end of the developing housing in the first direction, is characterized in that: The protective cover includes: The main body of the protective cover is used to protect the developing roller; A first mounting portion includes a first main body and a connecting portion formed on the first main body, the first main body being connected to the protective cover body, and the connecting portion being used to mate with the end cap; and The second mounting part is connected to the main body of the protective cover and is used to cooperate with the bracket; Along the first direction, the first mounting portion and the second mounting portion are disposed opposite to each other at both ends of the protective cover body. The second mounting portion has a second main body portion and a groove formed on the second main body portion, or the second mounting portion is configured as a closed structure.

2. The protective cover according to claim 1, characterized in that, The developing cartridge includes an extension formed around a first through hole, the extension being used to protect the developing coupling component. The connecting portion and the second mounting portion are configured as a closed structure, the connecting portion being used to cooperate with the extension portion so that the protective cover can be fixed after being installed into the developing cartridge.

3. The protective cover according to claim 2, characterized in that, The protective cover also has a first covering portion, a second covering portion, a third covering portion and a fourth covering portion extending from the main body of the protective cover. Along a first direction, the first covering portion and the second covering portion are respectively disposed on both sides of the main body of the protective cover; the third covering portion and the fourth covering portion are disposed opposite to each other along a third direction, and the first direction and the third direction intersect.

4. The protective cover according to claim 3, characterized in that, The developing cartridge includes a powder dispensing blade fixedly mounted on the developing housing. The powder dispensing blade is used to adjust the thickness of the toner layer on the surface of the developing roller. The first covering part and the second covering part can cover the powder dispensing blade.

5. The protective cover according to claim 4, characterized in that, The protective cover has a functional portion extending from the joint, and the functional portion is provided with a handle.

6. The protective cover according to claim 1, characterized in that, The developing cartridge has a fastening member formed on the developing housing or support, and the second mounting portion has a fastening member for engaging with the fastening member, the fastening member being a protrusion and the fastening member being a groove.

7. The protective cover according to claim 1, characterized in that, The groove has a first fastening part and a second fastening part on both sides. The bracket has a bracket body and a fastened part formed on the bracket body. The fastened part is used to cooperate with the first fastening part and the second fastening part.

8. The protective cover according to claim 7, characterized in that, The direction intersecting the first direction is the third direction. Along the third direction, the first and second fastening parts are not connected and the shortest distance between them is less than the diameter of the fastened part.

9. The protective cover according to claim 1, characterized in that, The developing cartridge includes an action mechanism for receiving a separation force applied by the device, and the protective cover also has a clearance portion formed on the side of the protective cover body facing the developing cartridge, the clearance portion being used to avoid the action mechanism.

10. A developing cartridge assembly, characterized in that: The device includes a developing cartridge and a protective cover as described in any one of claims 1-9, the developing cartridge being detachably mounted in an electrophotographic imaging apparatus, and including a developing housing and a developing roller rotatably disposed in the developing housing, the protective cover being detachably coupled to the developing housing.

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