Drum and process cartridge

Abstract

The utility model provides a kind of drum box and the processing box with the drum box of having it, drum box includes drum shell and rotatably arranged in the photosensitive drum in drum shell, the surface of photosensitive drum is used to form latent electrostatic image, photosensitive drum and the developing roller outside drum box are oppositely arranged along front-back direction, photosensitive drum rotates around the rotation axis parallel to left and right direction;Drum box further includes the waste powder bin formed in the drum shell and the cleaning scraper detachably arranged in the drum shell, cleaning scraper is used to scrape off waste powder remaining on the surface of photosensitive drum, waste powder bin is used to accommodate waste powder;In up-down direction, drum shell includes the sixth side plate above waste powder bin, sixth side plate includes first sub-side plate, second sub-side plate and the step portion connecting first sub-side plate and second sub-side plate, in up-down direction, first sub-side plate is located above second sub-side plate, along front-back direction, part of cleaning scraper coincides with step portion, in this way, cleaning scraper can be stably arranged in drum shell.

Description

Technical Field

[0001] This utility model relates to the field of electrophotographic imaging technology, and in particular to a drum box and a processing box having the drum box. Background Technology

[0002] The processing cartridge can be detachably installed into an electrophotographic imaging device. The processing cartridge includes a drum box as an imaging mechanism and a developing cartridge as a developing mechanism. The drum box and the developing cartridge are combined with each other. The developing cartridge includes a developing housing and a developing roller rotatably disposed in the developing housing. The developing roller is used to supply toner contained in the developing housing to the photosensitive drum disposed in the drum box, so that the electrostatic latent image on the surface of the photosensitive drum is developed.

[0003] The drum housing includes a drum shell and a cleaning scraper detachably disposed in the drum shell. The photosensitive drum is rotatably disposed in the drum shell. The cleaning scraper is used to scrape off residual toner on the surface of the photosensitive drum to prevent residual toner from affecting the subsequent imaging quality.

[0004] Generally, the residual toner scraped off by the cleaning blade is stored in the drum housing. To reduce operating costs, after the toner in the developing housing is used up, the user will add new toner to the developing housing to continue generating new residual toner. Therefore, the larger the space in the drum housing that can accommodate residual toner, the better.

[0005] However, cleaning scrapers are typically fixed to the drum housing with screws. Given the increased space within the drum housing to accommodate residual toner, how to ensure the cleaning scraper is stably mounted within the drum housing is a problem that researchers need to consider. Utility Model Content

[0006] This utility model provides a drum box and a processing box having the drum box, to solve at least one of the above-mentioned technical problems. The specific technical solution is as follows:

[0007] The drum box includes a drum housing and a photosensitive drum rotatably disposed in the drum housing. The surface of the photosensitive drum is used to form an electrostatic latent image. The photosensitive drum and the developing roller outside the drum box are disposed opposite each other in the front-back direction. The photosensitive drum rotates about a rotation axis parallel to the left-right direction. The left-right direction intersects the front-back direction. The direction that intersects both the left-right direction and the front-back direction is the up-down direction.

[0008] The drum housing also includes a waste toner bin formed within the drum housing and a cleaning scraper detachably disposed within the drum housing. The cleaning scraper is used to scrape off waste toner residue on the surface of the photosensitive drum, and the waste toner bin is used to hold the waste toner. In the vertical direction, the drum housing includes a sixth side plate located above the waste toner bin. The sixth side plate includes a first sub-side plate, a second sub-side plate, and a stepped portion connecting the first sub-side plate and the second sub-side plate. In the vertical direction, the first sub-side plate is located above the second sub-side plate. In the front-back direction, a portion of the cleaning scraper coincides with the stepped portion.

[0009] The drum box is also provided with two mounting platforms that are spaced apart from each other in the left-right direction. The mounting platforms are accommodated by the waste powder bin. The mounting platforms are used to install cleaning scrapers. In the left-right direction, at least a portion of the stepped portion is located between the two mounting platforms.

[0010] The drum box / drum shell is provided with two functional parts that are spaced apart and opposite each other in the left-right direction. The functional parts are open in the front direction, and at least a part of the functional parts is opposite to the mounting platform in the front-back direction.

[0011] The mounting platform includes a seventh part for mounting the cleaning scraper, wherein the size of the seventh part is less than or equal to the size of the actuating part in the left-right direction.

[0012] The drum box is also equipped with a discharge port for discharging waste powder from the waste powder bin and a fourth sealing element for sealing the discharge port. The discharge port is open to the front and is connected to the waste powder bin.

[0013] The drum shell also includes a tenth side plate, a seventh side plate that is spaced apart from the sixth side plate in the vertical direction, and an eighth and ninth side plates that are spaced apart from each other in the horizontal direction. In the vertical direction, the sixth side plate is located above the seventh side plate. In the horizontal direction, the eighth side plate is located to the left of the ninth side plate. The sixth, seventh, eighth and ninth side plates are all connected to the tenth side plate. In the front-back direction, the tenth side plate is located in front of the sixth, seventh, eighth and ninth side plates.

[0014] The waste powder bin is formed by a second sub-side plate, a portion of an eighth side plate, a portion of a ninth side plate, and a tenth side plate. The waste powder bin is open at least to the rear. An operating space is formed between another portion of the first sub-side plate, another portion of the eighth side plate, and another portion of the ninth side plate. In the front-back direction, the cleaning scraper is located behind the waste powder bin, and the waste powder bin is located in front of the operating space. The cleaning scraper is set in the operating space. In the vertical direction, a portion of the operating space is located above the waste powder bin.

[0015] The powder discharge port is located on the tenth side plate and extends through the tenth side plate in the front-to-back direction. In the vertical direction, the powder discharge port is closer to the second sub-side plate than to the seventh side plate.

[0016] The connection between the tenth side plate and the seventh side plate is formed with a rounded chamfer, and the connection between the tenth side plate and the sixth side plate / second sub-side plate is formed with a right angle.

[0017] The mounting platform is connected to at least one of the eighth side plate, the ninth side plate, the tenth side plate, the second sub-side plate, and the step portion to enhance the stability of the mounting platform in the drum box.

[0018] The cleaning scraper includes a blade holder and a blade mounted on the blade holder. The blade is used to contact the surface of the photosensitive drum to scrape off waste powder from the surface of the photosensitive drum. In the front-to-back direction, at least a portion of the blade holder coincides with the stepped portion.

[0019] The processing cartridge includes a developing cartridge and the aforementioned drum cartridge, which are connected together. The developing cartridge includes a developing housing and a developing roller rotatably disposed in the developing housing. The developing housing contains toner. The developing roller and the photosensitive drum are disposed opposite to each other. The toner is supplied to the photosensitive drum through the developing roller, thereby developing the electrostatic latent image on the surface of the photosensitive drum.

[0020] Compared with the prior art, in the processing box and drum box provided by this utility model, along the front-to-back direction, a part of the cleaning scraper or at least a part of the scraper holder coincides with the step portion. Through the mounting platform / seventh part and the step portion, the cleaning scraper / scraper holder is stably set in the drum shell, thereby enabling the cleaning scraper to clean the waste powder on the surface of the photosensitive drum more thoroughly and avoid the waste powder on the surface of the photosensitive drum from affecting the subsequent imaging quality. Attached Figure Description

[0021] Figure 1 This is a perspective view of the processing box involved in this utility model.

[0022] Figure 2 This utility model relates to a processing box, along... Figure 1 Plan view after sectioning along the CC direction.

[0023] Figure 3A and Figure 3B This is a perspective view of the drum of the processing box involved in this utility model.

[0024] Figure 4 This is a perspective view of some components of the drum of the processing box involved in this utility model.

[0025] Figure 5 This is a perspective view of the drum shell of the processing box involved in this utility model.

[0026] Figure 6 This utility model relates to the drum shell of the processing box, along... Figure 3B A three-dimensional view after being sectioned along the DD direction. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a perspective view of the processing box involved in this utility model; Figure 2 This utility model relates to a processing box, along... Figure 1 Plan view after sectioning along the CC direction.

[0029] like Figure 1 and Figure 2 As shown, the processing cartridge 100 includes a drum cartridge 11 and a developing cartridge 12 connected to each other. The drum cartridge 11 includes a drum housing 111 and a photosensitive drum 112 rotatably disposed in the drum housing 111. The surface of the photosensitive drum 112 is used to form an electrostatic latent image. The developing cartridge 12 includes a developing housing 121 and a developing roller 122 rotatably disposed in the developing housing 121. The developing roller 122 and the photosensitive drum 112 are arranged opposite to each other. In other words, the photosensitive drum 112 and the developing roller 122 outside the drum cartridge 11 are arranged opposite to each other in the front-back direction. The developing roller 122 is used to carry toner and supply the toner contained in the developing housing 121 to the photosensitive drum 112, so that the electrostatic latent image on the surface of the photosensitive drum 112 is developed.

[0030] In some embodiments, the processing cartridge 100 further includes a toner cartridge 20 and a toner cartridge mounting portion 13 for mounting the toner cartridge. The toner cartridge mounting portion 13 is connected to the developing cartridge 12. The toner cartridge 20 is used to hold toner and supply toner to the developing cartridge 12 to expand the toner capacity of the processing cartridge 100. The toner cartridge 20 is detachably mounted to the toner cartridge mounting portion 13.

[0031] Figure 3A and Figure 3B This is a perspective view of the drum of the processing box involved in this utility model; Figure 4 This is a perspective view of some components of the drum of the processing box involved in this utility model.

[0032] like Figure 2 , Figure 3A , Figure 3B and Figure 4 As shown, the drum housing 11 includes a waste toner bin 113 formed within the drum housing 111 and a cleaning scraper 114 detachably mounted on the drum housing 111. The cleaning scraper 114 is used to scrape off residual toner (also referred to as "waste toner") on the surface of the photosensitive drum 112, and the waste toner bin 113 is used to hold the toner scraped off by the cleaning scraper 114.

[0033] The developing roller 122 rotates around a first rotation axis L parallel to the left-right direction, and the photosensitive drum 112 rotates around a rotation axis parallel to the first rotation axis L. The direction intersecting the left-right direction is the front-back direction. The developing cartridge 12 and the photosensitive drum 112 are arranged in a back-to-forehead direction. In the front-back direction, at least a portion of the photosensitive drum 112 is located in front of the developing roller 122. The direction intersecting both the left-right direction and the front-back direction is the up-down direction. Preferably, the left-right direction, the front-back direction, and the up-down direction are orthogonal to each other.

[0034] like Figure 2 and Figure 3A As shown, the drum box 11 also includes a charging roller 115 for charging the surface of the photosensitive drum 112, and at least a portion of the charging roller 115 is located above the photosensitive drum 112 in the vertical direction.

[0035] Figure 5 This is a perspective view of the drum shell of the processing box involved in this utility model.

[0036] like Figure 3A , Figure 3B , Figure 4 and Figure 5 As shown, the drum housing 111 includes a sixth side plate 111a and a seventh side plate 111b spaced apart and opposite each other in the vertical direction, and an eighth side plate 111c and a ninth side plate 111d spaced apart and opposite each other in the horizontal direction. In the vertical direction, the sixth side plate 111a is located above the seventh side plate 111b, and in the horizontal direction, the eighth side plate 111c is located to the left of the ninth side plate 111d. The drum housing 111 also includes a sixth side plate 111a, a seventh side plate 111b, an eighth side plate 111c, and a ninth side plate 111d that are simultaneously spaced apart and opposite each other in the vertical direction. The tenth side plate 111e, connected to 11d, is located in front of the sixth side plate 111a, the seventh side plate 111b, the eighth side plate 111c, and the ninth side plate 111d in the front-back direction. The sixth side plate 111a, the seventh side plate 111b, the eighth side plate 111c, the ninth side plate 111d, and the tenth side plate 111e enclose and form the waste powder bin 113. The waste powder bin 113 is open at least to the rear. In the vertical direction, the waste powder bin 113 is located below the sixth side plate 111a.

[0037] The sixth side plate 111a includes a first sub-side plate 111a1, a second sub-side plate 111a2, and a stepped portion 111a3 connecting the first sub-side plate 111a1 and the second sub-side plate 111a2. In the vertical direction, the first sub-side plate 111a1 is located above the second sub-side plate 111a2. In the front-back direction, the first sub-side plate 111a1 is located behind the second sub-side plate 111a2. That is to say, in the vertical direction, the second sub-side plate 111a2 is recessed downward relative to the first sub-side plate 111a1. In this way, the overall shape of the drum box 11 is simpler and more beautiful.

[0038] The waste powder bin 113 is formed by the enclosure of the second sub-side plate 111a2, a portion of the eighth side plate 111c, a portion of the ninth side plate 111d, and the tenth side plate 111e. An operating space 116 is formed between the first sub-side plate 111a1, another portion of the eighth side plate 111c, and another portion of the ninth side plate 111d. In the front-back direction, the waste powder bin 113 is located in front of the cleaning scraper 114, and the waste powder bin 113 is located in front of the operating space 116. The cleaning scraper 114 is disposed in the operating space 116. In the vertical direction, a portion of the operating space 116 is located above the waste powder bin 113. In this way, the cleaning scraper 114 has enough space to operate during assembly, which simplifies the installation of the cleaning scraper 114. At the same time, the cleaning scraper 114 is less likely to interfere with the first sub-side plate 111a1, the eighth side plate 111c, and the ninth side plate 111d.

[0039] like Figure 4 As shown, the cleaning scraper 114 includes a blade holder 114a and a blade 114b mounted on the blade holder 114a. The blade 114b is used to contact the surface of the photosensitive drum 112 to scrape off waste powder from the surface of the photosensitive drum 112. Along the front-back direction, a portion of the cleaning scraper 114 overlaps with the step portion 111a3. Furthermore, at least a portion of the blade holder 114a overlaps with the step portion 111a3. With this arrangement, the cleaning scraper 114 can be more stably mounted on the drum housing 111, thereby enabling the cleaning scraper 114 to clean the waste powder on the surface of the photosensitive drum 112 more thoroughly, thus avoiding the impact of waste powder on the surface of the photosensitive drum 112 on the subsequent imaging quality.

[0040] In some embodiments, the tool holder 114a is configured in an "L" shape, comprising a fifth part 114a1 and a sixth part 114a2 connected to each other. In the vertical direction, the fifth part 114a1 is located above the sixth part 114a2, and the following fastener is connected to the sixth part 114a2. With this configuration, because the operating space 116 is large enough, interference between the components is less likely to occur when assembling the remaining parts of the drum box 11. After the drum box 11 is assembled, if the drum box 11 is impacted or falls, the charging roller 115 and the photosensitive drum 112 are less likely to come into contact with the fifth part 114a1, thus avoiding damage to the charging roller 115 and the photosensitive drum 112.

[0041] Continue as Figure 4 As shown, the drum housing 11 also includes a third seal 119 disposed on the seventh side plate 111b. The third seal 119 is used to prevent waste powder from leaking between the drum housing 111 and the photosensitive drum 112. The third seal 119 can contact the photosensitive drum 112. In the vertical direction, the cleaning scraper 114 is located above the third seal 119. Along the direction intersecting with the horizontal direction, an inlet 111f is formed between the cleaning scraper 114 and the third seal 119 to allow waste powder to enter the waste powder chamber 113. In the front-back direction, the cleaning scraper 114 and the third seal 119 are located behind the waste powder chamber 113. With this arrangement, the waste powder can enter the waste powder chamber 113 through the inlet 111f. At the same time, the cleaning scraper 114 and the third seal 119 can prevent waste powder from leaking backward from the waste powder chamber 113.

[0042] In some embodiments, the third seal 119 is provided as a smooth plastic sheet to avoid damage to the surface of the photosensitive drum 112.

[0043] Figure 6 This utility model relates to the drum shell of the processing box, along... Figure 3B A three-dimensional view after being sectioned along the DD direction.

[0044] In some implementations, such as Figure 3B , Figure 5 and Figure 6 As shown, the drum box 11 is also provided with a powder discharge port 117a for discharging waste powder from the waste powder bin 113 and a fourth sealing member 117b for sealing the powder discharge port 117a. The powder discharge port 117a is connected to the waste powder bin 113. The powder discharge port 117a is provided on the tenth side plate 111e. The powder discharge port 117a is open facing forward. In the front-back direction, the powder discharge port 117a penetrates the tenth side plate 111e in the front-back direction. The powder discharge port 117a is opposite to the inlet 111f in the front-back direction.

[0045] In some embodiments, in the vertical direction, the powder discharge port 117a is closer to the second sub-side plate 111a2 than the seventh side plate 111b. This can be understood as the distance between the lowest point of the powder discharge port 117a and the seventh side plate 111b being greater than the distance between the lowest point of the powder discharge port 117a and the second sub-side plate 111a2. In this way, the portion of the waste powder bin 113 located below the lowest point of the powder discharge port 117a can hold more waste powder, making it less likely for the waste powder in the waste powder bin 113 to reach the lowest point of the powder discharge port 117a. During the opening of the fourth seal 117b, the waste powder will not flow out from the powder discharge port 117a.

[0046] like Figure 2 and Figure 6 As shown, the connection between the tenth side plate 111e and the seventh side plate 111b forms a rounded chamfer, and the connection between the tenth side plate 111e and the sixth side plate 111a / second sub-side plate 111a2 forms a right angle. With this configuration, the flow of waste powder in the waste powder bin becomes smoother. During the process of waste powder being discharged through the discharge port 117a, the waste powder can be discharged more conveniently, and a small amount of waste powder will not remain in the waste powder bin 113. For example, the waste powder will not remain at the connection between the tenth side plate 111e and the seventh side plate 111b or at the connection between the tenth side plate 111e and the second sub-side plate 111a2.

[0047] like Figure 5 As shown, the drum box 11 is also provided with two mounting platforms 118 that are spaced apart from each other in the left-right direction. The mounting platforms 118 are accommodated by the waste powder bin 113. The mounting platforms 118 are used to install at least the cleaning scraper 114 / blade holder 114a. In the left-right direction, at least a portion of the step portion 111a3 is located between the two mounting platforms 118. The mounting platforms 118 are connected to at least one of the tenth side plate 111e, the second sub-side plate 111a2 and the step portion 111a3 to enhance the stability of the mounting platforms 118 in the drum box 111, thereby enhancing the stability of the cleaning scraper 114 in the drum box 11.

[0048] In some embodiments, the mounting platform 118 may also be connected to at least one of the eighth side plate 111c and the ninth side plate 111d, which can further enhance the stability of the mounting platform 118 and allow the cleaning scraper 114 to be more stably fixed to the drum housing 111.

[0049] The drum housing 11 is also provided with a fastener for fixing the cleaning scraper 114 / blade holder 114a to the drum housing 111. In some embodiments, the fastener is a screw, and the mounting platform 118 is provided with a screw hole 118a. The screw can pass through the mounting hole provided on the blade holder 114a and engage with the screw hole 118a, so that the cleaning scraper 114 / blade holder 114a is fixed to the drum housing 111.

[0050] In some embodiments, the fastener is provided as an adhesive to secure the cleaning scraper 114 / blade holder 114a to the mounting platform 118.

[0051] In some embodiments, the tool holder 114a can be directly fixed to the step portion 111a3, for example, by adhesive. In this way, the drum box 11 does not need to be equipped with the mounting platform 118, the manufacturing cost of the drum box 11 can be reduced, and the capacity of the waste powder hopper 113 can be increased.

[0052] like Figure 3B and Figure 6 As shown, the drum box 11 / drum shell 111 is also provided with two working parts 118b facing forward. The two working parts 118b are arranged opposite each other at intervals in the left and right direction. The working parts 118b are used to facilitate demolding of the drum shell 111 during injection molding. At the same time, they can also prevent the drum shell 111 from deforming after injection molding, which would affect the dimensional accuracy of the drum shell 111 and thus affect the subsequent assembly / assembly of the drum shell 111.

[0053] Along the front-to-back direction, at least a portion of the active part 118b is opposite to the mounting platform 118, which helps to prevent deformation of the mounting platform 118 after injection molding.

[0054] In the vertical direction, the functional part 118b is closer to the second sub-side plate 111a2 than the seventh side plate 111b.

[0055] In some embodiments, the screw hole 118a is located behind the actuating part 118b in the front-back direction.

[0056] In some embodiments, the powder discharge port 117a is located between two working parts 118b in the left-right direction.

[0057] In some embodiments, the actuating part 118b is configured as a through hole extending in the front-back direction, and the actuating part 118b communicates with the screw hole 118a.

[0058] In some embodiments, the actuating part 118b is configured as a groove that opens forward.

[0059] like Figure 5 As shown, the mounting platform 118 includes a seventh part 118c and an eighth part 118d connected in the left-right direction. The seventh part 118c is used to install the cleaning scraper 114 / blade holder 114a, and the eighth part 118d is used to enhance the stability of the mounting platform 118 in the drum box 11. Therefore, in the mounting platform 118, at least the eighth part 118d has certain requirements in terms of its dimensions in the left-right direction.

[0060] In some embodiments, the screw hole 118a is located in the seventh part 118c.

[0061] As mentioned above, along the front-to-back direction, a portion of the cleaning scraper 114 / at least a portion of the blade holder 114a coincides with the step portion 111a3. With this configuration, the mounting platform 118 can only have the seventh part 118c and not the eighth part 118d. Furthermore, the size of the seventh part 118c in the left-to-right direction is not limited. In the technical solution provided by this utility model, the step portion 111a3 can stably mount the blade holder 114a on the drum housing 111. The mounting platform 118 / the seventh part 118c only serves to enhance the fixing effect. In order to allow the waste powder bin 113 to hold as much waste powder as possible, the size of the seventh part 118c in the left-to-right direction is as small as possible. With this configuration, the waste powder bin 113 can hold more toner. For example, the size of the seventh part 118c in the left-to-right direction is less than or equal to the size of the actuating part 118b in the left-to-right direction.

[0062] [Beneficial Effects]

[0063] Compared with the prior art, the processing box 100 and the drum box 11 in the processing box 100 provided by this utility model have the following beneficial effects:

[0064] Firstly, along the front-to-back direction, a portion of the cleaning blade 114 or at least a portion of the blade holder 114a coincides with the step portion 111a3. Through the mounting platform 118 / seventh part 118c and the step portion 111a3, the cleaning blade 114 / blade holder 114a is stably mounted on the drum housing 111, thereby enabling the cleaning blade 114 to clean the waste powder on the surface of the photosensitive drum 112 more thoroughly, avoiding the impact of the waste powder on the surface of the photosensitive drum 112 on the subsequent imaging quality.

[0065] Secondly, the drum housing 111 is also provided with two working parts 118b facing forward. The working parts 118b are used to facilitate demolding of the drum housing 111 during the injection molding process. At the same time, they can also prevent the drum housing 111 from deforming after injection molding, which would affect the dimensional accuracy of the drum housing 111 and thus affect the subsequent assembly / assembly of the drum housing 111.

[0066] Thirdly, the mounting platform 118 is accommodated by the waste powder bin 113. The mounting platform 118 is provided with a seventh part 118c. The dimension of the seventh part 118c in the left-right direction is less than or equal to the dimension of the function part 118b in the left-right direction. In this way, the volume occupied by the mounting platform 118 / seventh part 118c in the waste powder bin 113 is small, and the capacity of the waste powder bin 113 can be increased to accommodate more waste powder.

[0067] Fourthly, in the front-back direction, the waste powder bin 113 is located in front of the operating space 116, and the cleaning scraper 114 is arranged in the operating space 116. In the vertical direction, a part of the operating space 116 is located above the waste powder bin 113. In this way, the cleaning scraper 114 has enough space to operate during assembly, which simplifies the installation of the cleaning scraper 114. At the same time, the cleaning scraper 114 is less likely to interfere with the first sub-side plate 111a1, the eighth side plate 111c, and the ninth side plate 111d.

Claims

1. A drum housing, comprising a drum shell and a photosensitive drum rotatably disposed within the drum shell, the surface of the photosensitive drum being used to form an electrostatic latent image, the photosensitive drum and a developing roller outside the drum housing being disposed opposite each other in the front-back direction; the photosensitive drum rotates about a rotation axis parallel to the left-right direction, the left-right direction intersecting the front-back direction, and the direction intersecting both the left-right and front-back directions is the up-down direction. Its features are, The drum housing also includes a waste toner bin formed within the drum housing and a cleaning scraper detachably disposed within the drum housing. The cleaning scraper is used to scrape off waste toner residue on the surface of the photosensitive drum, and the waste toner bin is used to hold the waste toner. In the vertical direction, the drum housing includes a sixth side plate located above the waste toner bin. The sixth side plate includes a first sub-side plate, a second sub-side plate, and a stepped portion connecting the first sub-side plate and the second sub-side plate. In the vertical direction, the first sub-side plate is located above the second sub-side plate. In the front-back direction, a portion of the cleaning scraper coincides with the stepped portion.

2. The drum box according to claim 1, characterized in that, The drum box is also provided with two mounting platforms that are spaced apart from each other in the left-right direction. The mounting platforms are accommodated by the waste powder bin. The mounting platforms are used to install cleaning scrapers. In the left-right direction, at least a portion of the stepped portion is located between the two mounting platforms. The drum box / drum shell is provided with two functional parts that are spaced apart and opposite each other in the left-right direction. The functional parts are open in the front direction, and at least a part of the functional parts is opposite to the mounting platform in the front-back direction.

3. The drum box according to claim 2, characterized in that, The mounting platform includes a seventh part for mounting the cleaning scraper, wherein the size of the seventh part is less than or equal to the size of the actuating part in the left-right direction.

4. The drum box according to claim 2, characterized in that, The drum box is also equipped with a discharge port for discharging waste powder from the waste powder bin and a fourth sealing element for sealing the discharge port. The discharge port is open to the front and is connected to the waste powder bin.

5. The drum box according to claim 4, characterized in that, The drum shell also includes a tenth side plate, a seventh side plate that is spaced apart from the sixth side plate in the vertical direction, and an eighth and ninth side plates that are spaced apart from each other in the horizontal direction. In the vertical direction, the sixth side plate is located above the seventh side plate. In the horizontal direction, the eighth side plate is located to the left of the ninth side plate. The sixth, seventh, eighth and ninth side plates are all connected to the tenth side plate. In the front-back direction, the tenth side plate is located in front of the sixth, seventh, eighth and ninth side plates. The waste powder bin is formed by a second sub-side plate, a portion of an eighth side plate, a portion of a ninth side plate, and a tenth side plate. The waste powder bin is open at least to the rear. An operating space is formed between another portion of the first sub-side plate, another portion of the eighth side plate, and another portion of the ninth side plate. In the front-back direction, the cleaning scraper is located behind the waste powder bin, and the waste powder bin is located in front of the operating space. The cleaning scraper is set in the operating space. In the vertical direction, a portion of the operating space is located above the waste powder bin.

6. The drum box according to claim 5, characterized in that, The powder discharge port is located on the tenth side plate and extends through the tenth side plate in the front-to-back direction. In the vertical direction, the powder discharge port is closer to the second sub-side plate than to the seventh side plate.

7. The drum box according to claim 5, characterized in that, The connection between the tenth side plate and the seventh side plate is formed with a rounded chamfer, and the connection between the tenth side plate and the sixth side plate / second sub-side plate is formed with a right angle.

8. The drum box according to claim 5, characterized in that, The mounting platform is connected to at least one of the eighth side plate, the ninth side plate, the tenth side plate, the second sub-side plate, and the step portion to enhance the stability of the mounting platform in the drum box.

9. The drum box according to claim 1, characterized in that, The cleaning scraper includes a blade holder and a blade mounted on the blade holder. The blade is used to contact the surface of the photosensitive drum to scrape off waste powder from the surface of the photosensitive drum. In the front-to-back direction, at least a portion of the blade holder coincides with the stepped portion.

10. A processing box, characterized in that, The invention includes a developer cartridge combined with each other and a drum cartridge as described in any one of claims 1 to 9. The developer cartridge includes a developer housing and a developer roller rotatably disposed in the developer housing. The developer housing contains toner. The developer roller and the photosensitive drum are disposed opposite to each other. The toner is supplied to the photosensitive drum through the developer roller, thereby developing an electrostatic latent image on the surface of the photosensitive drum.

Images