Imaging unit and toner cartridge
By designing separate developing and non-developing sections for the scraper in the toner cartridge, and using zoned pressure and elastic materials, the problems of photosensitive drum wear and toner leakage were solved, resulting in a longer service life and higher image quality.
Patent Information
- Application Number
- CN202520366012.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-04
AI Technical Summary
In existing toner cartridges, the contact structure between the scraper and the photosensitive drum causes wear on the photosensitive drum, reduces the cleaning effect, and easily leads to toner leakage.
The scraper is designed with developing and non-developing sections. The developing section applies high cleaning pressure when it comes into contact with the developing area of the photosensitive drum, while the non-developing section applies low cleaning pressure when it comes into contact with the non-developing area of the photosensitive drum. The use of elastic materials and zoned pressure design ensures effective cleaning and protection of the photosensitive drum.
It extends the lifespan of the photosensitive drum, improves the problem of toner leakage, enhances image quality, simplifies the structure, and reduces production costs.
Smart Images
Figure CN223911168U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electrophotographic imaging, and in particular to an imaging unit and a toner cartridge provided with the imaging unit. BACKGROUND
[0002] Electrophotographic imaging equipment (such as laser printers, inkjet printers, etc.) is a common office equipment; among them, the laser printer is to form characters and / or patterns, etc. on the printing medium such as paper by the way of electronic imaging, and uses the toner cartridge as the consumable container.
[0003] The existing toner cartridge usually comprises a developing unit and an imaging unit, wherein the imaging unit comprises a waste powder bin, a photosensitive drum, a charging roller, a cleaning blade, etc. The photosensitive drum and the charging roller are rotatably installed on the waste powder bin around their own shaft centers, the photosensitive drum is arranged at the waste powder collecting port of the waste powder bin, and the charging roller is used for charging the photosensitive drum; the cleaning blade is installed on the waste powder bin, the blade of the cleaning blade is in contact with the surface of the photosensitive drum, and the contact positions of the two are located at the waste powder collecting port, so that the blade can scrape off the residual waste powder on the photosensitive drum and make the waste powder fall into the waste powder collecting port and be recycled into the waste powder bin, thereby ensuring the printing quality, and in addition, the blade can also play the role of lubricating the photosensitive drum to prevent the photosensitive drum from being worn in the long-term use.
[0004] However, since the contact structure and contact mode of the blade with the developing area and the non-developing area of the photosensitive drum are the same, and the contact stress and cleaning mode in the actual work of the developing area and the non-developing area of the photosensitive drum are different, the photosensitive drum is prone to wear and tear and the cleaning effect of the blade is poor in the long-term abutment with the blade, thereby causing the residual toner on the surface of the photosensitive drum to cause imaging defects, and the serious problem of toner leakage may also occur. SUMMARY
[0005] In order to solve the above problems, the main purpose of the utility model is to provide an imaging unit which can improve the imaging quality and prolong the service life of the photosensitive drum.
[0006] Another purpose of the utility model is to provide a toner cartridge provided with the above imaging unit.
[0007] In order to realize the main purpose of the utility model, the utility model provides an imaging unit, which comprises a waste powder bin, a photosensitive drum and a cleaning blade, the photosensitive drum is rotatably installed on the waste powder bin around its own shaft center, the cleaning blade is installed on the waste powder bin, the cleaning blade comprises a blade, and the blade is in contact with the surface of the photosensitive drum, wherein the blade has a developing section and two non-developing sections, the developing section is located between the two non-developing sections, the developing section is in contact with the developing area of the photosensitive drum, the non-developing sections are in contact with the non-developing areas of the photosensitive drum, and the cleaning pressure of the developing section on the developing area is greater than the cleaning pressure of the non-developing sections on the non-developing areas.
[0008] From the above, by the partition pressure design of the scraping piece, the cleaning efficiency of the scraping piece is optimized, the wear speed of the photosensitive drum is reduced, the service life of the photosensitive drum is prolonged, and the powder leakage problem is improved.
[0009] Further, the scraping piece has elasticity; the elasticity of the non-development section is greater than that of the development section.
[0010] From the above, the development section has lower elasticity, which can exert greater cleaning pressure on the photosensitive drum to ensure that the toner in the development area of the photosensitive drum is completely removed, avoiding image residue; and the non-development section has higher elasticity, which can automatically adjust the contact force and angle according to the rotation and surface condition of the photosensitive drum, avoiding hard friction on the non-development area of the photosensitive drum, and prolonging the service life of the photosensitive drum.
[0011] One preferred solution is that the scraping piece is made of polyurethane material, rubber material or foamed elastic material.
[0012] From the above, by the design of the scraping piece material, reliable cleaning of the scraping piece on the photosensitive drum can be ensured without causing excessive wear to the photosensitive drum, ensuring the performance and service life of the photosensitive drum.
[0013] Another preferred solution is that from the junction of the non-development section and the development section to the first end of the non-development section away from the development section, the thickness of the non-development section gradually decreases.
[0014] From the above, this design helps to avoid damage to the photosensitive drum by the non-development section of the scraping piece, and ensures that the cleaning effect on the non-development area of the photosensitive drum can meet the requirements.
[0015] Further, the first face of the non-development section facing the photosensitive drum is an inclined plane; in the thickness direction of the scraping piece, the first vertical distance between the inclined plane and the axis of the photosensitive drum at the junction is less than the second vertical distance between the inclined plane and the axis of the photosensitive drum at the first end.
[0016] From the above, this design makes the non-development section of the scraping piece better fit the surface of the photosensitive drum, while ensuring that the end of the non-development section does not have excessive contact pressure with the surface of the photosensitive drum, and that the elasticity of the non-development section increases as it gets closer to its end, so that it can adapt to the possible jumping of the end of the photosensitive drum during rotation, to better protect the photosensitive drum.
[0017] Another preferred solution is that the non-development section is subjected to material reduction and hollowing out.
[0018] Further, the non-development section is provided with a blind groove extending from the end face of the non-development section away from the development section in the length direction of the blade, or a groove hole extending from one face of the non-development section to the other face of the non-development section in the thickness direction of the blade, or the groove hole penetrating through the non-development section in the thickness direction of the blade.
[0019] As can be seen, the design helps to further improve the elastic performance of the non-development section.
[0020] Further, the non-development section is provided with a chamfer structure in contact with the surface of the photosensitive drum.
[0021] As can be seen, since the non-development section of the photosensitive drum is a non-working area, chamfering the edge of the non-development section of the blade in contact with the photosensitive drum can avoid the blade exerting excessive pressure on the surface of the photosensitive drum, thereby ensuring that the non-development section of the photosensitive drum has a required cleaning effect, and avoiding damage to the surface of the photosensitive drum by the non-development section of the blade, thereby prolonging the service life of the photosensitive drum and improving the powder leakage problem.
[0022] In order to achieve another purpose of the present application, the present application provides a toner cartridge, comprising a developing unit, the developing unit comprising a developing frame and a developing roller, the developing roller being rotatably installed on the developing frame about its own axis, wherein the toner cartridge further comprises the above-mentioned imaging unit, the developing frame is connected with a waste powder bin, the developing roller is in separable contact with a photosensitive drum, the photosensitive drum is provided with a photosensitive drum gear, the developing roller is provided with a developing roller gear, and the photosensitive drum gear and the developing roller gear are directly or indirectly linked.
[0023] As can be seen, the toner cartridge is provided with the above-mentioned imaging unit, which can have a longer service life and better avoid the powder leakage problem.
[0024] Further, the toner cartridge is an integrated toner cartridge, or the toner cartridge is a split toner cartridge.
[0025] As can be seen, the imaging unit can be applied to an integrated toner cartridge or a split toner cartridge, has a large application range, and is practical. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 is a structural diagram of a first embodiment of the toner cartridge of the present application.
[0027] Figure 2 is a structural diagram of the imaging unit of the first embodiment of the toner cartridge of the present application after omitting part of the assembly.
[0028] Figure 3 is a structural diagram of the cleaning doctor of the first embodiment of the toner cartridge of the present application from a first perspective.
[0029] Figure 4 is the structure diagram of the cleaning scraper of the first embodiment of the toner cartridge in the second perspective view.
[0030] Figure 5 is the structure diagram of the imaging unit of the first embodiment of the toner cartridge after the second part of the assembly is omitted.
[0031] Figure 6 is the partial view of the cleaning scraper of the second embodiment of the toner cartridge.
[0032] Figure 7 is the partial view of the cleaning scraper of the third embodiment of the toner cartridge.
[0033] The utility model will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION
[0034] The first embodiment of the toner cartridge
[0035] Referring to Figure 1 , the toner cartridge 100 comprises an imaging unit 101 and a developing unit 102. Among them, the developing unit 102 comprises a developing frame 4 and a developing roller 5, the developing roller 5 is rotatably installed on the developing frame 4 around its own axis, of course, the developing unit 102 also comprises other components, such as powder feeding roller, stirring frame, powder output scraper, transmission wheel group and the like, since the functions, effects, installation mode, movement principle of the foregoing other components and the corresponding functional components in the existing developing unit 102 are identical, therefore, it is not described here.
[0036] In combination with Figure 2The imaging unit 101 comprises a waste powder bin 1, a photosensitive drum 2 and a cleaning blade 3. The photosensitive drum 2 is rotatably mounted on the waste powder bin 1; the cleaning blade 3 comprises a blade holder 31 and a blade 32, the blade holder 31 is connected with the waste powder bin 1, and the blade 32 is mounted on the waste powder bin 1 and in contact with the surface of the photosensitive drum 2 to clean the photosensitive drum 2 and remove the residual toner on the surface of the photosensitive drum 2. Similarly, the imaging unit 101 also comprises other components, such as a charging roller, a biasing mechanism for controlling the contact between the charging roller and the photosensitive drum 2, and the like. Since the functions, effects, mounting methods and movement principles of the foregoing components and the corresponding functional components in the existing imaging unit 101 are consistent, they will not be described here. The waste powder bin 1 is movably connected with the developing frame 4, so that the photosensitive drum 2 can be in contact with or separated from the developing roller 5; when the toner cartridge 100 is in a printing operation state, the photosensitive drum 2 is in contact with and linked with the developing roller 5, and in this embodiment, the photosensitive drum 2 is provided with a photosensitive drum gear 23, and the developing roller 5 is provided with a developing roller gear 5151; when the photosensitive drum 2 is in contact with and linked with the developing roller 5, the photosensitive drum gear 23 is engaged with the developing roller gear 5151, so that the two can rotate towards each other, thereby transferring the toner on the developing roller 5 to the photosensitive drum 2; when the toner cartridge 100 is in a non-printing operation state, the photosensitive drum 2 is separated from and unlinked with the developing roller 5, so that the photosensitive drum gear 23 is disengaged from the developing roller gear 5151, thereby facilitating the cleaning blade 3 to clean the surface of the photosensitive drum 2. It should be noted that the engagement between the photosensitive drum gear 23 and the developing roller gear 5151 can be direct engagement or indirect engagement through the above-mentioned transmission wheel set.
[0037] Since the photosensitive drum 2 has a developing area 21 and a non-developing area 22, wherein the developing area 21 participates in the imaging printing operation, and the non-developing area 22 generally does not participate in the imaging printing operation, so that there is a certain difference between the developing area 21 and the non-developing area 22; therefore, the blade 32 of the cleaning blade 3 is optimized and designed to ensure the cleaning ability and cleaning effect of the blade 32 on the developing area 21, thereby reducing the cleaning pressure of the blade 32 on the non-developing area 22, avoiding damage to the photosensitive drum 2, thereby prolonging the service life of the photosensitive drum 2 and improving the toner leakage of the toner cartridge 100. The number of non-developing areas 22 is two, and in the axial direction of the photosensitive drum 2, the developing area 21 is located between the two non-developing areas 22.
[0038] In combination with Figures 3 to 5The developing section 321 and the two non-developing sections 322 are formed on the blade 32, and in the axial direction of the photosensitive drum 2, the developing section 321 is located between the two non-developing sections 322, so that when the cleaning doctor 3 is assembled, the developing section 321 of the blade 32 is in contact with the developing area 21 of the photosensitive drum 2, and one non-developing section 322 of the blade 32 is in contact with one non-developing area 22 of the photosensitive drum 2; wherein the cleaning pressure of the developing section 321 on the developing area 21 is greater than the cleaning pressure of the non-developing section 322 on the non-developing area 22.
[0039] It can be understood that through the pressure zoning design of the blade 32, the blade 32 can be used to clean and optimize different areas of the photosensitive drum 2. For example, because the cleaning pressure of the developing section 321 on the developing area 21 is greater, the developing section 321 can scrape off the residual toner on the developing area 21, clean it up and recycle it into the waste toner bin 1, avoid the residual toner on the photosensitive drum 2 from falling off due to vibration, friction and other factors during continuous rotation of the photosensitive drum 2, and cause toner leakage, ensure the cleaning effect of the residual toner on the developing area 21, ensure the residual toner removal rate, and reduce the possibility of toner leakage; and the cleaning pressure of the non-developing section 322 is reduced, which ensures that the non-developing section 322 meets the cleaning requirements of the non-developing area 22, reduces the wear of the non-developing area 22 (especially reduces the pressure applied by the end of the non-developing section 322 far away from the developing section 321 to the surface of the photosensitive drum 2), avoids damage to the surface of the photosensitive drum 2 by the non-developing section 322, ensures the service life of the photosensitive drum 2, and improves or even eliminates the toner leakage problem. It can be seen that this design can solve the technical problems existing in the prior art, balance the cleaning effect of the cleaning doctor 3 and the durability of the photosensitive drum 2, avoid printing defects, and improve the imaging quality.
[0040] Preferably, the blade 32 is elastic, and the elasticity of the non-development section 322 is greater than that of the development section 321. In this way, the pressure can be partitioned by means of material gradient, thickness difference or local structure difference, thus simplifying the structure and facilitating mass production without complex components. Since the elasticity of the development section 321 is lower (the rigidity is higher), it is ensured that the development section 321 exerts greater cleaning pressure on the development area 21, ensuring that the residual toner on the development area 21 is completely removed, avoiding image residual and toner leakage. The non-development section 322 has higher elasticity, which can automatically adjust the contact force and angle according to the rotation and surface condition of the photosensitive drum 2, so as to conform to the surface of the photosensitive drum 2, ensuring the cleaning effect on the non-development area 22, and at the same time, it can adapt to the possible jumping of the two ends of the photosensitive drum 2 during rotation, avoiding hard friction and / or hard extrusion on the non-development area 22 of the photosensitive drum 2, thereby preventing the surface of the photosensitive drum 2 from being damaged and prolonging the service life of the photosensitive drum 2. The differential design of the elasticity of the blade 32 itself enables different sections to better perform their respective functions, ensuring efficient cleaning of the development area 21, making the thickness of the toner layer attached to the development area 21 more uniform, and reducing interference and damage to the non-development area 22.
[0041] The blade 32 is preferably made of polyurethane material, rubber material or foamed elastic material, which can not only ensure the cleaning force and effect of the development section 321 and the non-development section 322, but also better prevent the blade 32 from damaging the photosensitive drum 2. In addition, the above-mentioned materials for manufacturing the blade 32 are mature materials in the prior art, which can not only ensure the stability and reliability of the structure of the blade 32, but also reduce production cost and process difficulty, and are more conducive to the production and use of the blade 32.
[0042] Further, the non-development section 322 is provided with a chamfer structure 3222 located at the bottom edge of the surface of the non-development section 322 facing the photosensitive drum 2, and the chamfer structure 3222 preferably extends to the end of the development section 321, so that the development section 321 and the non-development section 322 are smoothly transitioned at the junction, avoiding stress concentration at the junction, ensuring the structural stability and service life of the blade 32, thereby also avoiding the existence of sharp parts at the junction to damage the surface of the photosensitive drum 2. The non-development section 322 mainly contacts the surface of the photosensitive drum 2 through the chamfer structure 3222. The chamfer structure 3222 can be a rounded chamfer structure or an inclined chamfer structure.
[0043] Firstly, since the non-development area 22 of the photosensitive drum 2 is usually a non-working area, by chamfering the edge of the non-development section 322 of the blade 32 in contact with the photosensitive drum 2, the existence of sharp structures at the contact between the non-development section 322 and the photosensitive drum 2 is avoided, preventing the blade 32 from exerting excessive pressure on the surface of the photosensitive drum 2, and thus ensuring that the non-development area 22 of the photosensitive drum 2 has a satisfactory cleaning effect while avoiding damage to the surface of the photosensitive drum 2 by the non-development section 322 of the blade 32, thereby facilitating the extension of the service life of the photosensitive drum 2 and improving the problem of powder leakage. Secondly, the chamfered structure 3222 can play a role in guiding the flow of toner; when the blade 32 scrapes the toner, the chamfered structure 3222 can make the toner flow in a specific direction, avoiding the accumulation of toner in the contact area between the blade 32 and the photosensitive drum 2, and helping to smoothly guide the toner to the waste powder collection area, improving the toner collection efficiency, reducing toner residues, and thus improving the clarity and quality of the image, preventing problems such as toner contamination; and the chamfered structure 3222 can also avoid toner splashing during the scraping process, making the flow of toner more smooth and controllable, reducing the occurrence of toner splashing due to excessive impact, maintaining the cleanliness of the internal electronic photographic imaging equipment, and reducing the risk of equipment failure caused by toner splashing.
[0044] In the embodiment, the thickness of the non-developing section 322 gradually decreases from the junction with the developing section 321 to the first end of the non-developing section 322 away from the developing section 321. Since the elasticity of the non-developing section 322 is greater than that of the developing section 321, the gradually decreasing thickness can make the pressure from the junction with the developing section 321 to the first end of the non-developing section 322 form a gradual effect when the non-developing section 322 is in contact with the non-developing area 22 of the photosensitive drum 2. At the junction, the thickness is relatively large, and the pressure can be relatively large, ensuring that it can effectively receive a small amount of carbon powder and other impurities that may remain after the developing section 321 is cleaned; and as the thickness gradually decreases to the first end, the pressure also gradually decreases, gently cleaning the edge and other parts of the non-developing area 22, avoiding damage to the non-developing area 22 due to excessive pressure. As can be seen, this thickness design can make the non-developing section 322 better adapt to the cleaning needs of different positions of the non-developing area 22 of the photosensitive drum 2; the part of the non-developing area 22 close to the developing area 21 may have more carbon powder remaining, and the relatively large thickness and pressure can better clean it; and at the first end away from the developing area 21, there is usually less carbon powder, and the smaller thickness and pressure can complete the basic cleaning without unnecessary impact on the surface of the photosensitive drum 2, achieving comprehensive and delicate cleaning of the non-developing area 22. Furthermore, the gradually decreasing thickness of the non-developing section 322 makes the elasticity of the first end away from the developing area 21 optimal, which can better adapt to the possible jumping of the two ends of the photosensitive drum 2 during rotation, avoiding hard collision between the surface of the photosensitive drum 2 and the end of the scraper, that is, protecting the photosensitive drum 2, the imaging unit 101 and the scraper, and avoiding the vibration of the photosensitive drum 2 and / or the scraper caused by the impact, so as to improve the powder leakage problem.
[0045] Further, the first surface of the non-developing section 322 facing the photosensitive drum 2 is an inclined plane 3221, and the second surface of the developing section 321 facing the photosensitive drum 2 is a plane, and the included angle between the inclined plane 3221 and the plane is an obtuse angle; that is, as shown in Figure 5 the first vertical distance L1 between the inclined plane 3221 and the axis of the photosensitive drum 2 at the junction is less than the second vertical distance L2 between the inclined plane 3221 and the axis of the photosensitive drum 2 at the first end in the thickness direction of the scraper 32.
[0046] The design of the inclined plane 3221 makes the contact pressure between the non-development section 322 and the surface of the photosensitive drum 2 present a specific distribution. Since the junction is closer to the axis of the photosensitive drum 2, a relatively large pressure is generated at the junction when the photosensitive drum 2 is contacted, which helps to better remove a small amount of residual toner and other impurities that may be brought from the development area 21; and as the vertical distance gradually increases towards the first end, the pressure gradually decreases, which gently cleans the edge of the non-development area 22 and other parts, realizes the targeted pressure distribution of different positions of the non-development area 22, and improves the cleaning effect. In addition, the inclined plane 3221 can guide the toner to a certain extent. During the cleaning process of the scraping blade 32 rotating with the photosensitive drum 2, the inclined plane 3221 can make the scraped toner gather or flow along the inclined direction to a specific position, which is conducive to more effectively collecting the toner into the waste toner bin 1, reducing the residual and diffusion of toner in the non-development area 22, and further improving the cleaning effect and imaging quality.
[0047] As can be seen from the above, through the design of the imaging unit 101 of the toner cartridge 100, the toner cartridge 100 and the imaging unit 101 can have a longer service life, and the toner leakage problem can be avoided. The toner cartridge 100 can be set as a one-piece toner cartridge 100 or a split toner cartridge 100 according to different types of electrophotographic imaging equipment, use requirements, design requirements, etc., so that the toner cartridge 100 has a larger application range and stronger practicality.
[0048] Second embodiment of toner cartridge
[0049] Reference Figure 6 The difference between the present embodiment and the first embodiment of the toner cartridge is the structural design of the non-development section of the scraping blade, specifically:
[0050] The non-development section 61 of the scraping blade 6 is subjected to material reduction hollowing treatment to enhance the elasticity of the non-development section 61. In the present embodiment, the non-development section 61 can still maintain the design that the thickness gradually decreases from the junction of the non-development section 61 and the development section to the first end of the non-development section 61 away from the development section; in addition, a blind groove 611 is formed on the non-development section 61, which extends into the non-development section 61 from the end surface of the non-development section 61 away from the development section in the length direction of the scraping blade 6, realizing the material reduction hollowing treatment of the non-development section 61. Of course, in some embodiments, the design that the thickness of the non-development section 61 gradually decreases can be cancelled, and only the above-mentioned blind groove 611 is formed on the non-development section 61.
[0051] Third embodiment of toner cartridge
[0052] Reference Figure 7 The difference between the present embodiment and the second embodiment of the toner cartridge is the material reduction hollowing structure of the non-development section of the scraping blade, specifically:
[0053] In the present embodiment, the blind groove structure on the non-imaging section 71 is cancelled, and a groove hole 711 is formed on the non-imaging section 71, wherein the groove hole 711 extends from one side of the non-imaging section 71 to the other side of the non-imaging section 71 in the thickness direction of the blade 7 and penetrates the non-imaging section 71 in the thickness direction of the blade 7. Of course, as other optional solutions, in some embodiments, the groove hole 711 can not penetrate the non-imaging section 71 in the thickness direction of the blade 7. Wherein the number of groove holes 711 can be more than two, and the more than two groove holes 711 are preferably regularly distributed, such as the more than two groove holes 711 can be linearly distributed, such as the more than four groove holes 711 can be rectangularly distributed (i.e. N rows and M columns, wherein N≥2, M≥2), such as the more than four groove holes 711 can be circularly distributed, and the like; therefore, they are not listed one by one here.
[0054] Finally, it needs to be emphasized that the above description is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An image forming unit, comprising: a waste powder bin; a photosensitive drum rotatably mounted on the waste powder bin about an axis thereof; a cleaning blade mounted on the waste powder bin, the cleaning blade comprising a blade piece in contact with a surface of the photosensitive drum; characterized in that: the blade piece has a developing section and two non-developing sections, the developing section being located between the two non-developing sections, the developing section being in contact with a developing area of the photosensitive drum, the non-developing sections being in contact with non-developing areas of the photosensitive drum, a cleaning pressure of the developing section on the developing area being greater than a cleaning pressure of the non-developing sections on the non-developing areas.
2. The image forming unit according to claim 1, characterized in that: the blade piece has elasticity; the elasticity of the non-developing sections is greater than the elasticity of the developing section.
3. The image forming unit according to claim 2, characterized in that: the blade piece is made of a polyurethane material, a rubber material or a foamed elastic material.
4. The image forming unit according to claim 2, characterized in that: from a joint of the non-developing sections with the developing section to a first end of the non-developing sections away from the developing section, a thickness of the non-developing sections gradually decreases.
5. The image forming unit according to claim 4, characterized in that: a first face of the non-developing sections facing the photosensitive drum is an inclined plane; in a thickness direction of the blade piece, a first vertical distance between the inclined plane and the axis of the photosensitive drum at the joint is less than a second vertical distance between the inclined plane and the axis of the photosensitive drum at the first end.
6. The image forming unit according to claim 2, characterized in that: the non-developing sections are subjected to material reduction hollowing.
7. The image forming unit according to claim 6, characterized in that: a blind groove is formed on the non-developing sections, the blind groove extending into the non-developing sections from an end face of the non-developing sections away from the developing section in a length direction of the blade piece; or a groove hole is formed on the non-developing sections, the groove hole extending from one face of the non-developing sections to another face of the non-developing sections in a thickness direction of the blade piece, or the groove hole penetrates through the non-developing sections in the thickness direction of the blade piece.
8. The image forming unit according to any one of claims 1 to 7, characterized in that: the non-developing sections have a chamfer structure in contact with the surface of the photosensitive drum.
9. A toner cartridge comprising a developing unit, the developing unit comprising: a developing frame; a developing roller rotatably mounted on the developing frame about an axis thereof; characterized in that: the toner cartridge further comprises the image forming unit according to any one of claims 1 to 8, the developing frame is connected with the waste powder bin, the developing roller is in separable contact with the photosensitive drum, the photosensitive drum is provided with a photosensitive drum gear, the developing roller is provided with a developing roller gear, the photosensitive drum gear and the developing roller gear are directly or indirectly linked.
10. The toner cartridge according to claim 9, characterized in that: the toner cartridge is a one-piece toner cartridge; or the toner cartridge is a split toner cartridge.