Drum assembly

Abstract

The embodiment of the utility model relates to the technical field of image formation, and discloses a drum assembly, and the drum assembly comprises a lower frame which is provided with an end wall in a first direction, and the end wall is provided with a through hole; the photosensitive drum extends in the first direction, a gear is arranged at one end of the photosensitive drum, and the photosensitive drum penetrates through the through hole and the photosensitive drum through a drum shaft to be supported on the end wall; the upper frame is provided with a charging part, the upper frame is clamped with the lower frame, the upper frame is provided with a side wall opposite to the end wall, the side wall is provided with a sliding groove, and the sliding groove is matched with the drum shaft. By means of the mode, the efficiency of alignment and adaptation of the installation holes and the protrusions of the upper frame and the lower frame is improved.

Description

Technical Field

[0001] This application relates to the field of image forming apparatus technology, specifically to a drum assembly. Background Technology

[0002] The drum assembly is inserted into the developing cartridge, and together they are installed into the image forming apparatus (such as a printer) to provide developer to the image forming apparatus. In the prior art, when assembling the drum assembly, the drum shaft needs to be passed through the upper frame, lower frame, and photosensitive drum on one side first, and then through the lower frame and upper frame on the other side to complete the installation of the drum assembly. This installation method makes it difficult to align the holes of the upper frame, lower frame, and photosensitive drum at the same time, resulting in low production efficiency. Utility Model Content

[0003] In view of the above problems, this application provides a drum assembly that improves assembly efficiency.

[0004] According to one aspect of the embodiments of this application, a drum assembly is provided, the drum assembly including: a lower frame having an end wall in a first direction, the end wall having a through hole;

[0005] A photosensitive drum extends along a first direction, and a gear is provided at one end of the photosensitive drum. The photosensitive drum is supported on the end wall by a drum shaft passing through a through hole and the photosensitive drum.

[0006] The upper frame is equipped with a charging component. The upper frame is snapped into the lower frame. The upper frame has a side wall that is opposite to the end wall. The side wall has a sliding groove that is adapted to the drum shaft.

[0007] The drum assembly provided in this application embodiment has a sliding groove in the upper frame, which allows the photosensitive drum and drum shaft to be installed on the lower frame first, followed by the installation of the upper frame. This eliminates the need for the drum shaft to pass through the upper and lower frames, gears, and photosensitive drum simultaneously, improving assembly efficiency. Furthermore, the sliding groove guides the installation of the upper and lower frames, allowing for pre-positioning and improving the efficiency of aligning and fitting the mounting holes and protrusions of the upper and lower frames.

[0008] Optionally, the chute extends downward and the opening of the chute faces downward.

[0009] Optionally, the groove and the drum shaft are interference-fitted.

[0010] Optionally, the drum shaft has a shaft body with limiting recesses at both ends, and the inner wall of the slide groove of the upper frame is adapted to the limiting recesses.

[0011] Optionally, the upper part of the slide is smaller, and the lower part of the slide is larger.

[0012] Optionally, one of the end wall or side wall has a protrusion, and the other has a mounting hole.

[0013] Optionally, the end wall includes a first end wall and a second end wall disposed opposite to each other in a first direction, the side wall includes a first side wall and a second side wall disposed opposite to each other in a first direction, the protrusion includes a first protrusion and a second protrusion, and the mounting hole includes a first mounting hole and a second mounting hole.

[0014] One of the first end wall and the first side wall is provided with a first protrusion, and the other is provided with a first mounting hole, wherein the first protrusion engages with the first mounting hole;

[0015] One of the second end wall and the second side wall is provided with a second protrusion, and the other is provided with a second mounting hole, the second protrusion engaging with the second mounting hole.

[0016] Optionally, the lower frame has at least one of a front protrusion or a front mounting hole at its front end in the second direction, and the upper frame has at least the other of a front protrusion or a front mounting hole.

[0017] Optionally, the lower frame has a third end wall at the front end in the second direction, and the third end wall has a first front end mounting hole, a second front end protrusion and a third front end mounting hole in the first direction.

[0018] The upper frame is provided with a first front end protrusion, a second front end mounting hole and a third front end protrusion in the first direction;

[0019] The first front protrusion engages with the first front mounting hole, the second mounting hole engages with the second front protrusion, and the third front protrusion engages with the third front mounting hole.

[0020] Optionally, the protrusion and front mounting hole are located on both sides of the drum shaft in the second direction.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 A schematic diagram of the drum assembly provided in this embodiment is shown;

[0024] Figure 2 An exploded view of the drum assembly provided in this embodiment is shown;

[0025] Figure 3 An exploded view of the drum assembly provided in this embodiment from another angle is shown;

[0026] Figure 4 An exploded view of the drum assembly provided in this embodiment is shown from another angle;

[0027] Figure 5 A cross-sectional view of the drum assembly provided in this embodiment is shown;

[0028] Figure 6 A schematic diagram of the side structure of the upper frame in the drum assembly provided in this embodiment is shown;

[0029] Figure 7 A schematic diagram of the drum shaft in the drum assembly provided in this embodiment is shown. Detailed Implementation

[0030] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0035] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0036] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] For ease of description, this embodiment will use the left and right direction as the first direction, the front and back direction as the second direction, and the up and down direction as the third direction.

[0039] Please see Figures 1 to 7 This application provides a drum assembly. By setting a sliding groove on the upper frame, the drum shaft does not need to be aligned with the upper and lower frames, the photosensitive drum, and the gears simultaneously, thus improving the assembly efficiency of the drum assembly.

[0040] The drum assembly includes an upper frame 2, a lower frame 3, a photosensitive drum 4, a drum shaft 5, a charging component 6, a cleaning roller 7, and a cleaning steel shaft 8. The charging component 6, located on the upper frame 2, charges the photosensitive drum 4 and includes components such as corona wires and grids. The photosensitive drum 4, cleaning roller 7, and cleaning steel shaft 8 are rotatably supported at both ends of the lower frame 3 in the left-right direction. The photosensitive drum 4 receives developer from the developing cartridge. The cleaning roller 7 contacts the surface of the photosensitive drum 4 to remove excess developer. The cleaning steel shaft 8 removes developer from the surface of the cleaning roller 7. A gear 42 is located at the left end of the photosensitive drum 4. The gear 42 receives driving force from the image forming apparatus and rotates the photosensitive drum 4, cleaning roller 7, and cleaning steel shaft 8. The photosensitive drum 4 has an internal drum hole 41. The drum shaft 5 passes through the photosensitive drum 4 and the gear 42 and supports it. Waste toner bins are located at corresponding positions on the cleaning roller 7 and cleaning steel shaft 8 to receive collected waste toner.

[0041] The lower frame 3 has a first end wall 31 and a second end wall 32 arranged opposite each other in the left-right direction, and a third end wall 33 at its front end in the front-rear direction. The first end wall 31 has a first end wall through hole 311 through which the drum shaft 5 passes. The first end wall 31 has a first protrusion 312, the second end wall 32 has a second protrusion 322, and the third end wall 33 has a second front end protrusion 332, all three protrusions facing outward of the drum assembly. The third end wall 33 also has a first front end mounting hole 331 and a third front end mounting hole 3331, which are located on both sides of the second front end protrusion 332 in the left-right direction.

[0042] Correspondingly, the upper frame 2 has a first sidewall 21 and a second sidewall 22 arranged opposite to each other in the left-right direction. The first sidewall 21 has a first mounting hole 212, which is adapted to the first protrusion 312. The second sidewall 22 has a second mounting hole 222, which is adapted to the second protrusion 322, and the second mounting hole 222 specifically opens upward. The upper frame 2 has a second front mounting hole 232, which is adapted to the second front protrusion 332. The upper frame 2 also has a first front protrusion 231 and a third front protrusion 2331, which are adapted to the first front mounting hole 331 and the third front mounting hole 3331, respectively. Specifically, the first protrusion 312 and the first front mounting hole 331 are located on both sides of the drum shaft 5 of the photosensitive drum 4 in the front-back direction, and the second protrusion 322 and the third front mounting hole 3331 are located on both sides of the drum shaft 5 of the photosensitive drum 4, which improves the overall stability of the upper and lower frame adaptation.

[0043] The first end wall 31 and the second end wall 32 of the lower frame 3 have a first through hole 311 and a second through hole 321, respectively. The first side wall 21 and the second side wall 22 of the upper frame 2 have a first sliding groove 211 and a second sliding groove 221, respectively. The two sliding grooves extend downward and open downward, and are adapted to the drum shaft 5.

[0044] During assembly, the photosensitive drum 4 and drum shaft 5 are first installed on the lower frame 3, and then the upper frame 2 is installed on the lower frame 3. Specifically, the drum hole 41 of the photosensitive drum 4, which has the gear 42 fixed thereon, is aligned with the first through hole 311 of the first end wall 31 in the lower frame 3. Next, the drum shaft 5 passes through the gear 42 and the photosensitive drum 4, then passes through the second end wall 32 and protrudes outside the first end wall 31 and the second end wall 32. Then, the upper frame 2 is moved downwards towards the lower frame 3, and the first sliding groove 211 of the first side wall 21 and the second sliding groove 221 of the second side wall 22 are aligned with the two ends of the drum shaft 5, respectively. Then, the multiple mounting holes and protrusions of the upper frame 2 and the lower frame 3 are fitted together, so that the upper frame 2 and the lower frame 3 are snapped together. The sliding groove design allows the photosensitive drum 4 and drum shaft 5 to be installed on the lower frame 4 first, and then the upper frame is installed. The drum shaft 5 does not need to pass through the upper and lower frames, the gear 42, and the photosensitive drum 5 simultaneously, thus improving assembly efficiency. In addition, the sliding grooves guide the installation of the upper and lower frames, allowing them to be pre-positioned and improving the efficiency of aligning and fitting the mounting holes and protrusions of the upper and lower frames.

[0045] The upper frame 2 has a positioning part 2332 at the front end of the second side wall 22, which is close to the third front end protrusion 2331. The positioning part 2332 is adapted to the side wall 3332 on the outer side of the second end wall 32 of the lower frame 3. When the upper frame 2 is installed downwards towards the lower frame 3, the positioning part 2332 slides downwards along the side wall 3332, which improves the accuracy of the third front end protrusion 2331 aligning with the third front end mounting hole 3331 of the lower frame 3 and improves the assembly efficiency.

[0046] The first slide groove 211 and the second slide groove 221 open downwards. The upper part of the slide groove is smaller and the lower part is larger, which facilitates the slide groove of the upper frame 2 to continue downwards and be installed together with the drum shaft 5 when it approaches the drum shaft 5. The drum shaft 5 is interference-fitted with the upper part of the slide groove. The extension direction of the slide groove can be vertical or at a certain angle to the vertical direction.

[0047] The drum shaft 5 has a shaft body 51, and limiting recesses 52 are provided at both ends of the shaft body 51. During assembly, the inner wall of the slide groove of the upper frame 2 is adapted to the limiting recesses 52 to prevent the drum shaft 5 from moving axially after the upper and lower frames are installed. In other embodiments, to prevent the drum shaft 5 from moving axially, fasteners can also be installed on the outside of the slide groove to limit the drum shaft 5. The limiting recesses 52 can also be provided only at one end of the drum shaft 5. In other embodiments, after the upper and lower frames are installed, there is a slight gap between the slide groove and the drum shaft, such as 0-2mm, specifically 1mm. That is, the slide groove plays a guiding role for the installation of the upper and lower frames and does not limit the drum shaft. The gear 42 can be integrally formed with the photosensitive drum 4 or can be mounted and fixed to the photosensitive drum 4.

[0048] The upper frame 2 may have a groove in only one of the first side wall 21 and the second side wall 22, and the lower frame 3 may have a through hole corresponding to the groove in only one of the first end wall 31 and the second end wall 32.

[0049] The first mounting hole 212, the second mounting hole 222, the first front mounting hole 331, the second front mounting hole 232, and the third front mounting hole 3331 in the mounting holes of the upper frame 2 and the lower frame 3 are preferably through holes, which facilitates checking whether they are properly engaged during assembly and improves assembly efficiency. Optionally, the mounting holes can also be blind holes. The first protrusion 312, the second protrusion 322, the first front protrusion 231, the second front protrusion 332, and the third front protrusion 2331 in the protrusions of the upper frame 2 and the lower frame 3 are protruding or snap-fit ​​shaped. The positions of the mounting holes and protrusions of the upper frame 2 and the lower frame 3 can also be interchanged. The front mounting holes include one or more of the first front mounting hole 331, the second front mounting hole 232, and the third front mounting hole 3331, and the front protrusions include one or more of the first front protrusion 231, the second front protrusion 332, and the third front protrusion 2331. The lower frame 3 has at least one of a front end protrusion or a front end mounting hole, and the upper frame 2 has at least the other of a front end protrusion or a front end mounting hole. The first protrusion 312 may also be located between the first front end mounting hole 331 and the drum shaft 5 or directly above the drum shaft 5, and the second protrusion 322 may also be located between the third front end mounting hole 3331 and the drum shaft 5 or directly above the drum shaft 5.

[0050] In this embodiment, the upper frame of the drum assembly is provided with a sliding groove, which allows the photosensitive drum 4 and drum shaft 5 to be installed on the lower frame 4 first, followed by the installation of the upper frame. The drum shaft 5 does not need to pass through the upper and lower frames, the gear 42, and the photosensitive drum 5 simultaneously, thus improving assembly efficiency. Furthermore, the sliding groove guides the installation of the upper and lower frames, allowing them to be pre-positioned and improving the efficiency of aligning and fitting the mounting holes and protrusions of the upper and lower frames.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drum assembly, characterized in that, include: The lower frame has an end wall in a first direction, and the end wall has a through hole; A photosensitive drum extends along a first direction, and a gear is provided at one end of the photosensitive drum. The photosensitive drum is supported on the end wall by a drum shaft passing through the through hole and the photosensitive drum. The upper frame is equipped with a charging component. The upper frame is snapped into the lower frame. The upper frame has a side wall that is opposite to the end wall. The side wall is provided with a sliding groove that is adapted to the drum shaft.

2. The drum assembly according to claim 1, characterized in that, The groove extends downward and its opening faces downward.

3. The drum assembly according to claim 2, characterized in that, The groove is interference-fitted with the drum shaft.

4. The drum assembly according to claim 3, characterized in that, The drum shaft has a shaft body, and the two ends of the shaft body are provided with limiting recesses. The inner wall of the sliding groove of the upper frame is adapted to the limiting recesses.

5. The drum assembly according to claim 4, characterized in that, The upper part of the groove is smaller, and the lower part of the groove is larger.

6. The drum assembly according to any one of claims 2 to 5, characterized in that, One of the end walls or the side walls is provided with a protrusion, and the other is provided with a mounting hole.

7. The drum assembly according to claim 6, characterized in that, The end wall includes a first end wall and a second end wall disposed opposite to each other in a first direction; the side wall includes a first side wall and a second side wall disposed opposite to each other in a first direction; the protrusion includes a first protrusion and a second protrusion; and the mounting hole includes a first mounting hole and a second mounting hole. One of the first end wall and the first side wall is provided with the first protrusion, and the other is provided with the first mounting hole, wherein the first protrusion is engaged with the first mounting hole; One of the second end wall and the second side wall is provided with the second protrusion, and the other is provided with the second mounting hole, and the second protrusion engages with the second mounting hole.

8. The drum assembly according to claim 7, characterized in that, The lower frame is provided with at least one of a front protrusion or a front mounting hole at its front end in the second direction, and the upper frame is provided with at least the other of the front protrusion or the front mounting hole.

9. The drum assembly according to claim 8, characterized in that, The lower frame is provided with a third end wall at the front end in the second direction, and the third end wall is provided with a first front end mounting hole, a second front end protrusion and a third front end mounting hole in the first direction. The upper frame is provided with a first front end protrusion, a second front end mounting hole and a third front end protrusion in a first direction; The first front end protrusion engages with the first front end mounting hole, the second mounting hole engages with the second front end protrusion, and the third front end protrusion engages with the third front end mounting hole.

10. The drum assembly according to claim 8, characterized in that, The protrusion and the front mounting hole are located on both sides of the drum shaft in the second direction.

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