A photosensitive drum and a process cartridge

Abstract

A photosensitive drum and a process cartridge, the photosensitive drum comprising: a drum cylinder and a photosensitive drum gear arranged at one axial end of the drum cylinder, the photosensitive drum gear comprising a gear body and a gear tooth integrally connected with the gear body, the gear tooth comprising a gear tooth body and an extension extending from the gear tooth body; the gear tooth body is engaged with a first printer drive transmission gear, the extension abuts against a second printer drive transmission gear; the tooth thickness of the gear tooth body is greater than the tooth thickness of the extension. The part engaged with the first printer drive transmission gear and the part abutting against the second printer drive transmission gear are integrally arranged on the gear tooth of the gear body, and such an integrated structure only needs to arrange one gear on the photosensitive drum, so that the coaxiality of the two gears does not need to be considered in the production and assembly process of the photosensitive drum, the assembly precision requirement is reduced, and the production efficiency is improved, which is conducive to reducing the production cost of the photosensitive drum.

Description

Technical Field

[0001] This invention belongs to the field of printing consumables technology, and particularly relates to a photosensitive drum and processing box. Background Technology

[0002] The processing cartridge is a removable box that is installed into the main unit of an image forming apparatus. As a whole unit, the processing cartridge mainly includes a housing, a photosensitive drum, a developing roller, and a cavity for containing developer. The photosensitive drum is used to form an electrostatic latent image and is the key component in the processing cartridge that determines the image quality.

[0003] The main unit of the image forming apparatus transmits driving force to rotating components such as the photosensitive drum and developing roller in the processing cartridge, causing these rotating components to rotate around their own axes. Figure 1 This is a schematic diagram illustrating the transmission of driving force from an image forming apparatus to a photosensitive drum in the prior art. For example... Figure 1 As shown, the image forming apparatus main unit is equipped with a printer drive transmission gear, which includes a first printer drive transmission gear 101 and a second printer drive transmission gear 102 mounted on the printer gear fixed shaft 103. An idler gear 104 driven by a motor (not shown) is also mounted on the printer gear fixed shaft 103. The photosensitive drum 200 has an independent first photosensitive drum gear 201 and a second photosensitive drum gear 202 mounted on one axial end. The first photosensitive drum gear 201 meshes with the first printer drive transmission gear 101, and the second photosensitive drum gear 202 meshes with the second printer drive transmission gear 102. The driving force of the image forming apparatus main unit is transmitted to the photosensitive drum and other rotating components through the first and second printer drive transmission gears and the first and second photosensitive drum gears. Since the first and second photosensitive drum gears are coaxially mounted on the photosensitive drum and rotate in the same direction, and the gear teeth are designed to allow the photosensitive drum to move axially toward the drive side of the image forming device and rotate around the axis when subjected to force, the structural and assembly precision requirements for the photosensitive drum are very high, which in turn leads to high production costs for the photosensitive drum. Summary of the Invention

[0004] The purpose of this invention is to provide a photosensitive drum structure and processing box that can effectively improve production efficiency and reduce the production cost of photosensitive drums.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A photosensitive drum is used in a processing cartridge, which is detachably disposed in the main body of an image forming apparatus. The main body of the image forming apparatus is provided with a first printer drive transmission gear and a second printer drive transmission gear. The processing cartridge includes a photosensitive drum, which includes a drum cylinder. The photosensitive drum also includes a photosensitive drum gear disposed at an axial end of the drum cylinder. The photosensitive drum gear includes a gear body and gear teeth integrally connected to the gear body. Each gear tooth includes a gear tooth body and an extension extending from the gear tooth body. The gear tooth body meshes with the first printer drive transmission gear, and the extension abuts against the second printer drive transmission gear. The tooth thickness of the gear tooth body is greater than the tooth thickness of the extension.

[0007] In some embodiments, the extension can extend into the second printer drive transmission gear, and the extension and the second printer drive transmission gear at least partially overlap in the photosensitive drum axis.

[0008] In some embodiments, the thickness of the extension corresponding to the portion overlapping with the second printer drive transmission gear is less than the thickness of the gear tooth body.

[0009] In some embodiments, the extension is located near the junction of two teeth with different helix angles of the first printer drive transmission gear and the second printer drive transmission gear.

[0010] In some embodiments, the extension has an abutment surface that abuts against a second printer drive transmission gear, the abutment surface being located on the left, right, or both sides of the extension.

[0011] In some embodiments, the tooth body and the extension are connected by a tooth clearance notch, which is an arc surface that is concave inward from the tooth surface.

[0012] In some embodiments, the height of the tooth body is greater than the height of the extension.

[0013] In some embodiments, the thickness of the extension corresponding to the portion overlapping with the second printer drive transmission gear is less than the thickness of the gear tooth body.

[0014] In some embodiments, the length of the gear body along the axial direction of the photosensitive drum is greater than the length of the extension along the axial direction of the photosensitive drum.

[0015] As can be seen from the above technical solution, the present invention extends an extension portion from the gear tooth body. The gear tooth body meshes with the first printer drive transmission gear, and the extension portion abuts against the second printer drive transmission gear. This integrated structure only requires one gear on the photosensitive drum, reducing one gear compared to the prior art. This eliminates the need to consider the coaxiality of the two gears during the photosensitive drum production and assembly process, lowering the assembly precision requirements, thereby improving production efficiency and reducing the production cost of the photosensitive drum. The extension portion abuts against the second printer drive transmission gear, generating an axial force to prevent the gear from moving axially. This ensures that the outward movement of the first and second printer drive transmission gears along the axis towards the idler gear reaches a balanced state, ultimately achieving smooth operation of the drive transmission force.

[0016] The present invention also provides a photosensitive drum, including a drum cylinder and a photosensitive drum gear disposed at an axial end of the drum cylinder. The photosensitive drum gear includes a gear body and gear teeth integrally connected to the gear body. The gear teeth include a first tooth portion and a second tooth portion, wherein the tooth thickness of the second tooth portion is smaller than the tooth thickness of the first tooth portion.

[0017] In some embodiments, the first tooth and the second tooth are arranged adjacent to each other along the axial direction of the gear body, the second tooth is located at one end closer to the drum, and the first tooth is located at one end farther from the drum.

[0018] In some embodiments, the first tooth is used to mesh with the first printer drive transmission gear to receive the driving force transmitted by the first printer drive transmission gear; the second tooth is used to abut against the second printer drive transmission gear to generate a force along the axial direction of the photosensitive drum.

[0019] In some embodiments, the second tooth is located near the junction of two different helical angle teeth of the first printer drive transmission gear and the second printer drive transmission gear.

[0020] In some embodiments, the second tooth is wedge-shaped; it is a cutting surface tooth formed by cutting a portion of the first tooth near the drum, and the cutting surface of the second tooth is an abutment surface that abuts against the second printer drive transmission gear.

[0021] In some embodiments, the length of the first tooth along the axial direction of the photosensitive drum is less than the length of the first printer drive transmission gear along the axial direction, and the length of the second tooth along the axial direction of the photosensitive drum is less than the length of the second printer drive transmission gear along the axial direction.

[0022] In some embodiments, the second tooth is wedge-shaped; it is a cutting surface tooth formed by cutting a portion of the tooth near the drum.

[0023] In some embodiments, the second tooth has at least one working surface located on the left, right, or both sides of the tooth.

[0024] In some embodiments, the first tooth and the second tooth are connected by a tooth clearance notch, which is an inwardly concave arc surface.

[0025] In some embodiments, the tooth thickness of the second tooth gradually decreases outward from the point where the first tooth and the second tooth are connected along the tooth axis; and / or, the tooth height of the second tooth is less than the tooth height of the first tooth.

[0026] In some embodiments, the gear teeth are helical teeth.

[0027] In some embodiments, the length of the first tooth along the axial direction of the photosensitive drum is greater than the length of the second tooth along the axial direction of the photosensitive drum.

[0028] In some embodiments, the photosensitive drum gear and the drum cylinder are connected together by a connecting part, the connecting part including an assembly part inserted into the inner cavity of one axial end of the drum cylinder, a positioning part protruding outward from the assembly part along the axis of the connecting part, and a snap-fit ​​part disposed on the radially outer side of the positioning part. The positioning part has a structure that gradually converges from the inside to the outside along the axis of the connecting part. The inner cavity of the drum cylinder is provided with snap-fit ​​ribs or snap-fit ​​grooves that snap-fit ​​with the snap-fit ​​part. The axis of the connecting part, the axis of the photosensitive drum gear, and the axis of the drum cylinder coincide.

[0029] In some embodiments, the positioning part is conical.

[0030] In some embodiments, a pair of latching portions are provided on the radially outer side of the positioning portion, which are symmetrically arranged with the axis of the photosensitive drum gear as the axis of symmetry, and the latching portions extend outward parallel to the axis of the photosensitive drum gear.

[0031] As can be seen from the above technical solution, the present invention integrates the first tooth portion, which meshes with the first printer drive transmission gear, and the second tooth portion, which abuts against the second printer drive transmission gear, onto the gear body teeth. This integrated structure requires only one gear on the photosensitive drum, reducing one gear compared to the prior art. This eliminates the need to consider the coaxiality of the two gears during the photosensitive drum production and assembly process, lowering the assembly precision requirements, thereby improving production efficiency and reducing the production cost of the photosensitive drum. In specific applications, the second tooth portion abuts against the second printer drive transmission gear, generating an axial force to prevent the gear from moving axially. This ensures that the outward movement of the first and second printer drive transmission gears along the axis towards the idler gear reaches a balanced state, ultimately achieving smooth operation of the drive transmission force.

[0032] The present invention also provides a processing box, which is detachably disposed in the main body of an image forming apparatus. The main body of the image forming apparatus is provided with a first printer drive transmission gear and a second printer drive transmission gear. The processing box includes a housing and a photosensitive drum, which is rotatably supported on the housing. The photosensitive drum is the aforementioned photosensitive drum. The photosensitive drum gear meshes with the first printer drive transmission gear, and the photosensitive drum gear abuts against the second printer drive transmission gear.

[0033] A processing box is detachably disposed in the main body of an image forming apparatus. The main body of the image forming apparatus is provided with a first printer drive transmission gear and a second printer drive transmission gear. The processing box includes a housing and a photosensitive drum, the photosensitive drum being rotatably supported on the housing. The photosensitive drum includes a drum cylinder and a photosensitive drum gear disposed at an axial end of the drum cylinder. The photosensitive drum gear includes a gear body and gear teeth integrally connected to the gear body. The gear teeth include a first tooth portion and a second tooth portion, the tooth thickness of the second tooth portion being smaller than the tooth thickness of the first tooth portion.

[0034] In some embodiments, the first tooth and the second tooth are connected or arranged adjacent to each other along the axial direction of the gear body, the second tooth is located at one end closer to the drum, and the first tooth is located at one end farther from the drum.

[0035] In some embodiments, the second tooth can extend into the second printer drive transmission gear, and the second tooth and the second printer drive transmission gear at least partially overlap in the photosensitive drum axis.

[0036] In some embodiments, the second tooth is located near the junction of two different helical angle teeth of the first printer drive transmission gear and the second printer drive transmission gear.

[0037] In some embodiments, the second tooth is wedge-shaped; it is a cutting surface tooth formed by cutting a portion of the tooth near the drum, and at least one cutting surface of the second tooth is an abutment surface that abuts against the second printer drive transmission gear.

[0038] In some embodiments, the second tooth is wedge-shaped; it is a cutting surface tooth formed by cutting a portion of the tooth near the drum.

[0039] In some embodiments, the second tooth has at least one working surface located on the left, right, or both sides of the tooth.

[0040] In some embodiments, the first tooth and the second tooth are connected by a tooth clearance notch, which is an arc surface that is concave inward from the tooth surface.

[0041] In some embodiments, the tooth thickness of the second tooth gradually decreases outward from the point where the first tooth and the second tooth are connected or adjacent along the tooth axis;

[0042] And / or, the tooth height of the second tooth is less than the tooth height of the first tooth.

[0043] In some embodiments, the thickness of the extension corresponding to the portion overlapping with the second printer drive transmission gear is less than the thickness of the gear tooth body.

[0044] In some embodiments, the length of the first tooth along the axial direction of the photosensitive drum is greater than the length of the second tooth along the axial direction of the photosensitive drum.

[0045] In some embodiments, the first tooth meshes with a first printer drive transmission gear to receive the driving force transmitted by the first printer drive transmission gear; the second tooth abuts against a second printer drive transmission gear to generate a force along the axial direction of the photosensitive drum.

[0046] In some embodiments, the photosensitive drum gear and the drum cylinder are connected together by a connecting part, the connecting part including an assembly part inserted into the inner cavity of one axial end of the drum cylinder, a positioning part protruding outward from the assembly part along the axis of the connecting part, and a snap-fit ​​part disposed on the radially outer side of the positioning part. The positioning part has a structure that gradually converges from the inside to the outside along the axis of the connecting part. The inner cavity of the drum cylinder is provided with snap-fit ​​ribs or snap-fit ​​grooves that snap-fit ​​with the snap-fit ​​part. The axis of the connecting part, the axis of the photosensitive drum gear, and the axis of the drum cylinder coincide.

[0047] In some embodiments, the positioning part is conical.

[0048] In some embodiments, a pair of latching portions are provided on the radially outer side of the positioning portion, which are symmetrically arranged with the axis of the photosensitive drum gear as the axis of symmetry, and the latching portions extend outward parallel to the axis of the photosensitive drum gear.

[0049] A processing box is detachably disposed in the main body of an image forming apparatus. The main body of the image forming apparatus is provided with a first printer drive transmission gear and a second printer drive transmission gear. The processing box includes a drum, and the photosensitive drum further includes a photosensitive drum gear disposed at an axial end of the drum. The photosensitive drum gear includes a gear body and gear teeth integrally connected to the gear body. The gear teeth include a gear tooth body and an extension extending from the gear tooth body. The gear tooth body meshes with the first printer drive transmission gear, and the extension abuts against the second printer drive transmission gear. The tooth thickness of the gear tooth body is greater than the tooth thickness of the extension.

[0050] In some embodiments, the extension can extend into the second printer drive transmission gear, and the extension and the second printer drive transmission gear at least partially overlap in the photosensitive drum axis.

[0051] In some embodiments, the thickness of the extension corresponding to the portion overlapping with the second printer drive transmission gear is less than the thickness of the gear tooth body.

[0052] In some embodiments, the extension is located near the junction of two teeth with different helix angles of the first printer drive transmission gear and the second printer drive transmission gear.

[0053] In some embodiments, the extension has an abutment surface that abuts against a second printer drive transmission gear, the abutment surface being located on the left, right, or both sides of the extension.

[0054] In some embodiments, the tooth body and the extension are connected by a tooth clearance notch, which is an arc surface that is concave inward from the tooth surface.

[0055] In some embodiments, the height of the tooth body is greater than the height of the extension.

[0056] In some embodiments, the length of the gear body along the axial direction of the photosensitive drum is greater than the length of the extension along the axial direction of the photosensitive drum.

[0057] As can be seen from the above technical solution, the present invention integrates the first tooth or gear body that meshes with the first printer drive transmission gear and the second tooth or extension that abuts against the second printer drive transmission gear onto the gear body teeth. This integrated structure only requires one gear on the photosensitive drum, reducing one gear compared to the prior art. This eliminates the need to consider the coaxiality of the two gears during the photosensitive drum production and assembly process, lowering the assembly precision requirements, thereby improving production efficiency and reducing the production cost of the photosensitive drum. In specific applications, the second tooth or extension abuts against the second printer drive transmission gear, generating an axial force to prevent the gear from moving axially. This ensures that the outward movement of the first and second printer drive transmission gears along the axis towards the idler gear reaches a balanced state, ultimately achieving smooth operation of the drive transmission force. Attached Figure Description

[0058] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 is a schematic diagram of the transmission of driving force from the main unit of the image forming apparatus to the photosensitive drum in the prior art;

[0060] Figure 2 This is a partial structural diagram of the photosensitive drum in Embodiment 1 of the present invention;

[0061] Figure 3 This is an exploded structural diagram of the photosensitive drum of Embodiment 1 of the present invention;

[0062] Figure 4 This is a partial structural diagram of the photosensitive drum assembled on the processing box according to Embodiment 1 of the present invention;

[0063] Figure 5 This is a schematic diagram of the meshing of the photosensitive drum gear and the printer drive transmission gear in Embodiment 1 of the present invention;

[0064] Figure 6 This is a schematic diagram of the structure of the photosensitive drum gear in Embodiment 1 of the present invention;

[0065] Figure 7 For along Figure 6 A view showing the direction of the solid arrow in the center;

[0066] Figure 8 For along Figure 6 Sectional view of line AA in the middle;

[0067] Figure 9For the first tooth in Embodiment 1 of the present invention Figure 6 Cross-sectional view at line AA;

[0068] Figure 10 For along Figure 6 Sectional view of the middle BB line;

[0069] Figure 11 For the second tooth in Embodiment 1 of the present invention Figure 6 Cross-sectional view at the middle BB line;

[0070] Figure 12 For along Figure 6 A cross-sectional view of the CC line;

[0071] Figure 13 For the second tooth in Embodiment 1 of the present invention Figure 6 Cross-sectional view at the CC line;

[0072] Figure 14 This is a schematic diagram of the projection of the first and second teeth on the peripheral wall of the gear body in Embodiment 1 of the present invention;

[0073] Figure 15 This is a partial structural diagram of the photosensitive drum in Embodiment 2 of the present invention;

[0074] Figure 16 This is an exploded view of the photosensitive drum in Embodiment 2 of the present invention;

[0075] Figure 17 This is a schematic diagram of the photosensitive drum assembled on the processing box and engaged with the drive transmission gear in Embodiment 2 of the present invention;

[0076] Figure 18 This is a schematic diagram of the structure of the photosensitive drum gear in Embodiment 2 of the present invention;

[0077] Figure 19 For along Figure 18 A view showing the direction of the solid arrow in the center;

[0078] Figure 20 For along Figure 18 Sectional view of the DD line;

[0079] Figure 21 For the first tooth in Embodiment 2 of the present invention Figure 18 Cross-sectional view at the DD line;

[0080] Figure 22 For along Figure 18 A cross-sectional view of the EE line;

[0081] Figure 23 For the second tooth in Embodiment 2 of the present invention Figure 18 Cross-sectional view at the EE line;

[0082] Figure 24 For along Figure 18 Sectional view of the middle FF line;

[0083] Figure 25 For the second tooth in Embodiment 2 of the present invention Figure 18 Cross-sectional view at the FF line;

[0084] Figure 26 This is a schematic diagram of the projection of the first and second teeth on the peripheral wall of the gear body in Embodiment 2 of the present invention;

[0085] Figure 27 This is a partial structural diagram of the photosensitive drum in Embodiment 3 of the present invention;

[0086] Figure 28 This is a schematic diagram of the photosensitive drum assembled on the processing box and engaged with the drive transmission gear in Embodiment 3 of the present invention;

[0087] Figure 29 This is a schematic diagram of the structure of the photosensitive drum gear in Embodiment 3 of the present invention;

[0088] Figure 30 For along Figure 29 A view showing the direction of the solid arrow in the center;

[0089] Figure 31 For along Figure 29 A cross-sectional view of the GG line in the middle;

[0090] Figure 32 For the first tooth in Embodiment 3 of the present invention Figure 29 Cross-sectional view at the GG line;

[0091] Figure 33 For along Figure 29 A cross-sectional view of the middle HH line;

[0092] Figure 34 For the second tooth in Embodiment 3 of the present invention Figure 29 Cross-sectional view at the HH line;

[0093] Figure 35 For along Figure 29 Sectional view of line II in the middle;

[0094] Figure 36 For the second tooth in Embodiment 3 of the present invention Figure 29 Cross-sectional view at line II;

[0095] Figure 37 This is a schematic diagram of the projection of the first and second teeth on the peripheral wall of the gear body in Embodiment 3 of the present invention;

[0096] Figure 38 This is a partial structural schematic diagram of the photosensitive drum in Embodiment 4 of the present invention;

[0097] Figure 39 This is a schematic diagram of the photosensitive drum assembled on the processing box and engaged with the drive transmission gear in Embodiment 4 of the present invention.

[0098] Figure 40 This is a schematic diagram of the structure of the photosensitive drum gear in Embodiment 4 of the present invention;

[0099] Figure 41 For the gear tooth body in Embodiment 4 of the present invention Figure 40 Cross-sectional view at line JJ;

[0100] Figure 42 For the extension portion of Embodiment 4 of the present invention Figure 40 Cross-sectional view at the KK line;

[0101] Figure 43 For the extension portion of Embodiment 4 of the present invention Figure 40 Cross-sectional view at line LL;

[0102] Figure 44 This is a schematic projection of the gear tooth body and extension on the peripheral wall of the gear body in Embodiment 4 of the present invention.

[0103] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Detailed Implementation

[0104] The present invention will now be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, for ease of explanation, the drawings illustrating the device structure will be partially enlarged, not according to general proportions. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of the present invention. It should be noted that the drawings are simplified and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of the present invention. Additionally, in the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Terms such as "positive," "negative," "bottom," "upper," "lower," "front," "rear," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, not indicating or implying 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 present invention.

[0105] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0106] Example 1

[0107] Laser printers, copiers, and other image forming apparatuses typically have an image processing unit and a developing unit. The developing unit uses toner or other developer to develop the electrostatic latent image formed on the image processing unit, thus creating a visible image on paper or other media. The developing unit includes a processing cartridge, which is detachably installed into the main unit of the image forming apparatus. The processing cartridge, as a single unit, includes a housing, a photosensitive drum, a developing roller, a toner hopper for containing developer, and a waste toner hopper for containing waste toner. The photosensitive drum and developing roller are rotatably supported on the housing; the toner hopper and waste toner hopper are formed within the housing. The main unit of the image forming apparatus includes a first printer drive transmission gear and a second printer drive transmission gear that can rotate coaxially. The printer drive transmission gear transmits rotational driving force to the photosensitive drum.

[0108] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 The photosensitive drum in this embodiment includes a drum cylinder 1 and a photosensitive drum gear 2. The drum cylinder 1 can rotate around its own axis. The photosensitive drum gear 2 is disposed at one end of the drum cylinder 1 along its axial direction and is fixed to the drum cylinder 1. The photosensitive drum gear 2 is used to receive the driving force transmitted from the main unit of the image forming apparatus.

[0109] like Figure 1 , Figure 6 and Figure 7 As shown, the photosensitive drum gear 2 in this embodiment includes a gear body 2-1 and gear teeth composed of a first tooth portion 2-2 and a second tooth portion 2-3. The gear teeth are disposed on the outer peripheral wall of the gear body 2-1 and integrally connected to the gear body 2-1; the photosensitive drum gear 2 includes a plurality of gear teeth arranged circumferentially at intervals on the outer peripheral wall of the gear body 2-1, and the gear teeth in this embodiment are helical teeth. The first tooth portion 2-2 and the second tooth portion 2-3 are connected along the axial direction of the gear body 2-1. In some other embodiments, the first tooth portion and the second tooth portion may also be adjacently arranged with or without gap; the second tooth portion 2-3 is located at the end closer to the drum cylinder 1, and the first tooth portion 2-2 is located at the end farther away from the drum cylinder 1.

[0110] The first tooth 2-2 meshes with the first printer drive transmission gear 21 to receive the driving force transmitted by the first printer drive transmission gear 21. The second tooth 2-3 abuts against the second printer drive transmission gear 22 to generate a force along the axial direction of the photosensitive drum. The second tooth 2-3 has an abutting surface s that abuts against the second printer drive transmission gear 22. When the processing cartridge is installed in the main unit of the image forming apparatus, the second tooth 2-3 can extend into the second printer drive transmission gear 22, that is, the second tooth 2-3 can at least partially insert into the tooth gap of the second printer drive transmission gear 22, at least partially overlap, thereby abutting against the second printer drive transmission gear 22. The thickness of the second tooth corresponding to the overlapping portion with the second printer drive transmission gear is less than the thickness of the tooth body.

[0111] When the first printer drive transmission gear 21 and the second printer drive transmission gear 22 move along Figure 4 When rotating in the middle I direction, the photosensitive drum gear 2 moves along... Figure 4 The K-direction rotation causes the drum cylinder 1 of the photosensitive drum to rotate synchronously along the K-direction.

[0112] Reference Figures 6 to 14 In this embodiment, the tooth thickness of the first tooth 2-2 is greater than that of the second tooth 2-3. The tooth thickness of the second tooth 2-3 gradually decreases along the gear tooth axis from the point where the first tooth and the second tooth connect (towards the end of the photosensitive drum gear). The axis of this invention is a straight line passing through the geometric center of any cross-section of the cylinder and parallel to the generatrix. The tooth thickness of the first tooth 2-2 is uniform along the gear tooth axis. Of course, in some embodiments, adjustments can be made to the shape and size of the end of the first tooth 2-2 away from the second tooth, as long as the meshing of the main body of the first tooth 2-2 with the first printer drive transmission gear 21 is not affected.

[0113] The tooth height of the first tooth portion 2-2 is greater than the tooth height of the second tooth portion 2-3. The first printer drive transmission gear 21 and the second printer drive transmission gear 22 are helical gears, and the gear teeth are correspondingly set to helical gears for meshing transmission. When the idler wheel driven by the motor on the image forming apparatus main unit rotates (rotation direction such as I), and drives the first printer drive transmission gear 21 to rotate, the photosensitive drum gear 2 is driven to rotate (rotation direction such as K). Because both the first printer drive transmission gear 21 and the first tooth portion are helical gears, the first printer drive transmission gear 21, when rotating, will apply a thrust to the photosensitive drum gear 2 along the axis to the right, away from the idler wheel. Due to the interaction of forces, the photosensitive drum gear 2, when rotating, will apply a thrust to the first printer drive transmission gear 21 along the axis to the left, towards the idler wheel. Since the idler wheel on the image forming apparatus main unit is configured to allow a certain amount of displacement to the left, this will cause the first printer drive transmission gear 21 to move along the axis to the left, towards the idler wheel. To prevent the first printer drive transmission gear 21 from moving excessively, the axial force generated by the contact between the second tooth 2-3 and the second printer drive transmission gear 22 can make the amount of movement of the first printer drive transmission gear 21 and the second printer drive transmission gear 22 to the left along the axis toward the idler wheel reach a balanced state, thus achieving smooth operation of the drive transmission force.

[0114] In this embodiment, the second tooth 2-3 is generally wedge-shaped. It is formed by cutting a portion of the tooth near the drum 1 (in this embodiment, by oblique cutting) to create a cutting surface (oblique surface) tooth. The remaining portion forms the first tooth 2-2. The oblique surface formed when the tooth is obliquely cut is the contact surface s (working surface) where the second tooth 2-3 abuts against the teeth of the second printer drive transmission gear 22. The wedge shape described in this invention includes shapes formed by various processing methods, such as triangles (including right angles, isosceles triangles, and arbitrary triangles), similar triangles, duckbill shapes, and inverted trumpet shapes, which facilitate the insertion of the second tooth into the tooth gap of the second printer drive transmission gear 22, with at least one surface abutting against the teeth of the second printer drive transmission gear 22.

[0115] In this embodiment, the first tooth 2-2, the second tooth 2-3, and the gear body 2-1 are an integral structure. Therefore, it is not necessary to assemble the two gears coaxially. During the production and assembly of the photosensitive drum, there is no need to consider the coaxiality of the two gears during assembly, which reduces the assembly accuracy requirements of the photosensitive drum, reduces the assembly process, and helps to improve production efficiency and reduce the production cost of the photosensitive drum.

[0116] In this embodiment, the first tooth 2-2 and the second tooth 2-3 are integrated. The second tooth 2-3 is formed by cutting a portion of the tooth near the drum 1, and the remaining portion forms the first tooth 2-2. That is, the first tooth 2-2 and the second tooth 2-3 on the photosensitive drum gear are the same tooth. After cutting one end of the tooth, a structure (second tooth) that abuts against the second printer drive transmission gear 22 is formed, and the uncut portion is a structure (first tooth) that meshes with the first printer drive transmission gear 21. Figure 7 Taking the direction shown as an example, in this embodiment, the tooth segment near the drum 1 is obliquely cut from the right side to form the second tooth 2-3, that is, the contact surface s is located on the right side of the tooth.

[0117] When the processing cartridge is installed in the main unit of the image forming apparatus, the photosensitive drum gear 2 meshes with the first printer drive transmission gear 21 and the second printer drive transmission gear 22. Specifically, the first tooth 2-2 meshes with the first printer drive transmission gear 21, and the second tooth 2-3 abuts against the second printer drive transmission gear 22. The second tooth 2-3 is located near the junction of the two gear teeth with different helix angles of the first and second printer drive transmission gears 21 and 22. Figure 5 As shown; the proximity mentioned in this invention should include the state where the connection between the second tooth 2-3 and the first tooth 2-2 is located on the left, right, or flush with the junction of the teeth of the first printer drive transmission gear 21 and the second printer drive transmission gear 22 with different helix angles.

[0118] In some implementations, such as Figure 3 As shown, the photosensitive drum gear 2 and the drum cylinder 1 are connected together by a connecting part 1-1. The connecting part 1-1 includes an assembly part 1-1a, a positioning part 1-1b, and a snap-fit ​​part 1-1c. The assembly part 1-1a is inserted into the inner cavity of one axial end of the drum cylinder 1 and cooperates with the drum cylinder 1. The assembly part 1-1a and the drum cylinder 1 can be connected together by adhesive.

[0119] The positioning part 1-1b and the assembly part 1-1a are integrated and the positioning part 1-1b protrudes outward from the assembly part 1-1a along the axis of the connecting part 1-1. The positioning part 1-1b is conical in shape, and the outer diameter of the outer end of the positioning part 1-1b is smaller than the outer diameter of the inner end of the positioning part 1-1b. That is, the positioning part 1-1b has a structure that is smaller at the outer end and larger at the inner end, gradually converging from the inside to the outside along the axis of the connecting part 1-1. The axis of the connecting part 1-1, the axis of the photosensitive drum gear 2, and the axis of the drum 1 coincide, and the axes of these three components are also the axis of the photosensitive drum.

[0120] The photosensitive drum gear 2 has an inner cavity (not shown) that mates with the positioning part 1-1b. The positioning part 1-1b can be inserted into the inner cavity of the photosensitive drum gear 2. The positioning part 1-1b is used for positioning during assembly. This conical positioning structure facilitates the quick assembly of the photosensitive drum gear 2 and the connecting part 1-1, reduces the precision requirements of assembly, and facilitates the alignment of gears and connecting parts during assembly using automated equipment. It can effectively avoid interference and collision between the gear part and the connecting part, which is conducive to improving production efficiency and reducing costs.

[0121] The snap-fit ​​part 1-1c is located radially outside the positioning part 1-1b. In this embodiment, a pair of snap-fit ​​parts 1-1c are symmetrically arranged with the axis of the connecting part 1-1 as the axis of symmetry. The snap-fit ​​parts 1-1c extend outward parallel to the axis of the connecting part 1-1. The inner cavity of the photosensitive drum gear 2 is provided with snap-fit ​​ribs or snap-fit ​​grooves (not shown) for snap-fitting with the snap-fit ​​parts 1-1c. When the positioning part 1-1b is inserted into the inner cavity of the photosensitive drum gear 2, the snap-fit ​​part 1-1c can be snapped into the snap-fit ​​ribs or snap-fit ​​grooves, so that the photosensitive drum gear cannot be disengaged from the connecting part 1-1, ensuring the reliability of the assembly connection between the photosensitive drum gear 2 and the connecting part 1-1 (drum cylinder). After the photosensitive drum gear 2 is installed on the drum cylinder 1, it cannot rotate relative to the drum cylinder 1, but can only rotate synchronously with the drum cylinder 1 around the axis of the photosensitive drum.

[0122] The photosensitive drum gear of the present invention has a first tooth and a second tooth integrally formed on the gear body. The first tooth and the second tooth replace the two photosensitive drum gears in the prior art. The first tooth and the second tooth are integrally integrated on the teeth of the same gear body. Compared with the prior art, one gear is reduced, so that the coaxiality problem of the two gears does not need to be considered during the production and assembly of the photosensitive drum, thus reducing the assembly accuracy requirements.

[0123] In practical applications, the second tooth section is formed by machining the portion of the gear teeth near the drum according to the tooth structure of the second printer drive transmission gear. This second tooth section abuts against the teeth of the second printer drive transmission gear. Because the first and second tooth sections are integrated and machined from the same gear, no assembly is required, simplifying the assembly process. Furthermore, the abutment between the second tooth section and the second printer drive transmission gear generates axial force, preventing the gear from shifting axially.

[0124] In some embodiments, the length of the first tooth 2-2 along the photosensitive drum axis is greater than the length of the second tooth 2-3 along the photosensitive drum axis, that is, the tooth width of the first tooth is greater than the tooth width of the second tooth. Optionally, the length of the first tooth 2-2 along the photosensitive drum axis is less than the length of the first printer drive transmission gear 21 along the axis, and the length of the second tooth 2-3 along the photosensitive drum axis is less than the length of the second printer drive transmission gear 22 along the axis, that is, the tooth width of the first tooth is less than the tooth width of the gear on the first printer drive transmission gear 21, and the tooth width of the second tooth 2-3 is less than the tooth width of the gear on the second printer drive transmission gear 22. In other embodiments, the length of the first tooth 2-2 along the photosensitive drum axis may also be equal to or less than the length of the second tooth 2-3 along the photosensitive drum axis. The teeth may be helical teeth or straight teeth.

[0125] Example 2

[0126] Reference Figure 15 , Figure 16 and Figure 17 The photosensitive drum in this embodiment includes a drum cylinder 1 and a photosensitive drum gear 2. The drum cylinder 1 can rotate around its own axis. The photosensitive drum gear 2 is disposed at one end of the drum cylinder 1 along its axial direction and is fixed to the drum cylinder 1. The photosensitive drum gear 2 is used to receive the driving force transmitted from the main unit of the image forming apparatus.

[0127] The photosensitive drum gear 2 includes a gear body 2-1 and gear teeth composed of a first tooth portion 2-2 and a second tooth portion 2-3. The gear teeth are disposed on the outer peripheral wall of the gear body 2-1 and integrally connected to it. The photosensitive drum gear 2 includes a plurality of gear teeth arranged circumferentially on the outer peripheral wall of the gear body 2-1. The first tooth portion 2-2 and the second tooth portion 2-3 are connected axially along the gear body 2-1, with the second tooth portion 2-3 located at the end closer to the drum 1 and the first tooth portion 2-2 located at the end farther from the drum 1. The second tooth portion 2-3 is also wedge-shaped and has an abutment surface s that abuts against the second printer drive transmission gear 22.

[0128] When the processing cartridge is installed in the main unit of the image forming apparatus, the first tooth 2-2 meshes with the first printer drive transmission gear 21, and the second tooth 2-3 can extend into the second printer drive transmission gear 22 and abut against the second printer drive transmission gear 22. When the first tooth 2-2 meshes with the first printer drive transmission gear 21, it receives the driving force transmitted by the first printer drive transmission gear 21. When the second tooth 2-3 abuts against the second printer drive transmission gear 22, it generates a force along the axial direction of the photosensitive drum.

[0129] The main difference between this embodiment and Embodiment 1 is that the cutting direction is different when cutting the gear teeth. In Embodiment 1, the tooth segment near the drum 1 is obliquely cut on the right to form the second tooth 2-3, that is, the contact surface s is located on the right side of the gear teeth. In this embodiment, the tooth segment near the drum 1 is obliquely cut on the left to form the second tooth 2-3, that is, the contact surface s is located on the left side of the second tooth 2-3; the remaining part forms the first tooth 2-2.

[0130] like Figures 18 to 26 As shown, in this embodiment, the first tooth 2-2 and the second tooth 2-3 are integrated. The second tooth 2-3 is formed by cutting the portion of the tooth near the drum 1. After machining the end of the tooth near the drum 1, a structure is formed that abuts against the second printer drive transmission gear 22 (second tooth 2-3). The uncut portion is a structure that meshes with the first printer drive transmission gear 21 (first tooth 2-2). In this embodiment, the portion of the tooth near the drum 1 is obliquely cut from the left side to form the second tooth 2-3, that is, the abutment surface s is located on the left side of the tooth.

[0131] In this embodiment, the tooth thickness of the first tooth portion 2-2 is greater than the tooth thickness of the second tooth portion 2-3. The tooth thickness of the second tooth portion 2-3 gradually decreases outward from the junction of the first and second tooth portions along the axis. The tooth thickness of the first tooth portion 2-2 is uniform along the axis. The tooth height of the first tooth portion 2-2 is greater than the tooth height of the second tooth portion 2-3.

[0132] When the processing cartridge is installed in the main unit of the image forming apparatus, the photosensitive drum gear 2 meshes with the first printer drive transmission gear 21 and the second printer drive transmission gear 22. Specifically, the first tooth 2-2 meshes with the first printer drive transmission gear 21, and the second tooth 2-3 abuts against the second printer drive transmission gear 22. The second tooth 2-3 is located near the junction of the two gear teeth with different helix angles of the first and second printer drive transmission gears 21 and 22. Figure 17 As shown.

[0133] As an optional implementation of embodiments 1 and 2, the left and right sides of the tooth segment near the drum 1 can be cut (obliquely cut) to form the second tooth portion 2-3. At this time, the oblique cut forms two cutting surfaces (oblique surfaces), which serve as abutment surfaces s, located on both sides of the tooth. That is, the second tooth portion has at least one working surface (abutment surface s) located on the left, right, or both sides of the tooth.

[0134] Example 3

[0135] Reference Figure 27 , Figure 28 and Figure 29The photosensitive drum in this embodiment includes a drum cylinder 1 and a photosensitive drum gear 2. The drum cylinder 1 can rotate around its own axis. The photosensitive drum gear 2 is disposed at one end of the drum cylinder 1 along its axial direction and is fixed to the drum cylinder 1. The photosensitive drum gear 2 is used to receive the driving force transmitted from the main unit of the image forming apparatus.

[0136] The photosensitive drum gear 2 includes a gear body 2-1 and teeth composed of a first tooth portion 2-2 and a second tooth portion 2-3. The teeth are disposed on the outer peripheral wall of the gear body 2-1 and integrally connected to it. The photosensitive drum gear 2 includes a plurality of teeth arranged circumferentially on the outer peripheral wall of the gear body 2-1. The first tooth portion 2-2 and the second tooth portion 2-3 are connected axially along the gear body 2-1, with the second tooth portion 2-3 located at the end closer to the drum 1 and the first tooth portion 2-2 located at the end farther from the drum 1. The second tooth portion 2-3 has a contact surface s that abuts against the second printer drive transmission gear 22.

[0137] The first tooth 2-2 meshes with the first printer drive transmission gear 21, and the second tooth 2-3 abuts against the second printer drive transmission gear 22. When the processing cartridge is installed in the main unit of the image forming apparatus, the second tooth 2-3 can extend into the second printer drive transmission gear 22. When the first tooth 2-2 meshes with the first printer drive transmission gear 21, it receives the driving force transmitted by the first printer drive transmission gear 21. When the second tooth 2-3 abuts against the second printer drive transmission gear 22, it generates a force along the axial direction of the photosensitive drum, preventing the gear from moving axially during transmission.

[0138] Reference Figures 30 to 37 The main difference between this embodiment and Embodiment 1 is that the portion of the gear teeth near the drum 1 is obliquely cut from the right side to form the second tooth 2-3. The contact surface s formed after the oblique cut is connected to the first tooth 2-2 by a tooth clearance notch 2-4. The tooth clearance notch 2-4 is an arc surface that is concave inward from the tooth surface, making the second tooth 2-3 roughly wedge-shaped like a duckbill. A tooth clearance notch can also be provided between the second tooth and the first tooth in Embodiment 2.

[0139] The first tooth portion 2-2 and the second tooth portion 2-3 are integrated. The second tooth portion 2-3 is formed by cutting off a portion of the tooth near the drum 1, and the remaining portion forms the first tooth portion 2-2. Specifically, after machining the end of the tooth near the drum 1, it forms a structure that abuts against the second printer drive transmission gear 22 (second tooth portion 2-3), while the uncut portion meshes with the first printer drive transmission gear 21 (first tooth portion 2-2). The tooth thickness of the first tooth portion 2-2 is greater than that of the second tooth portion 2-3. The tooth thickness of the first tooth portion 2-2 is equal along the tooth axis.

[0140] When the processing cartridge is installed in the main unit of the image forming apparatus, the photosensitive drum gear 2 meshes with the first printer drive transmission gear 21 and the second printer drive transmission gear 22. Specifically, the first tooth 2-2 meshes with the first printer drive transmission gear 21, and the second tooth 2-3 abuts against the second printer drive transmission gear 22. The second tooth 2-3 is located near the junction of the two gear teeth with different helix angles of the first and second printer drive transmission gears 21 and 22. Figure 26 As shown.

[0141] Example 4

[0142] Reference Figure 38 , Figure 39 and Figure 40 The photosensitive drum in this embodiment includes a drum cylinder 1 and a photosensitive drum gear 2. The drum cylinder 1 can rotate around its own axis. The photosensitive drum gear 2 is disposed at one end of the drum cylinder 1 along its axial direction and is fixed to the drum cylinder 1. The photosensitive drum gear 2 is used to receive the driving force transmitted from the main unit of the image forming apparatus.

[0143] In this embodiment, the photosensitive drum gear 2 includes a gear body 2-1 and gear teeth disposed on the outer peripheral wall of the gear body 2-1. The gear teeth and the gear body 2-1 are integrally connected. Each gear tooth includes a gear tooth body 2-5 and an extension portion 2-6 extending outward from one end of the gear tooth body 2-5 along the gear tooth axis. The gear tooth body 2-5 and the extension portion 2-6 are integrally connected. In this embodiment, the gear teeth are helical teeth. The extension portion 2-6 is located at the end closer to the drum 1, and the gear tooth body 2-5 is located at the end farther from the drum 1.

[0144] When the processing cartridge is installed in the main unit of the image forming apparatus, the gear body 2-5 meshes with the first printer drive transmission gear 21 to receive the driving force transmitted by the first printer drive transmission gear 21. The extension 2-6 can extend into the second printer drive transmission gear 22, thereby abutting against the second printer drive transmission gear 22 to generate a force along the axial direction of the photosensitive drum. The extension 2-6 has an abutting surface s that abuts against the second printer drive transmission gear 22. The abutting surface s can be located on the left, right, or both sides of the extension 2-6; that is, the extension has at least one working surface (abutting surface s) located on the left, right, or both sides of the gear, so as to... Figure 40 Taking the direction shown as an example, the contact surface s in this embodiment is located on both sides of the gear tooth. The extension portion described in this invention can be triangular (including right-angled, isosceles, and arbitrary triangles) and similar shapes such as triangles, duckbill shapes, and inverted trumpet shapes.

[0145] When the first printer drive transmission gear 21 and the second printer drive transmission gear 22 move along Figure 39 When rotating in the middle I direction, the photosensitive drum gear 2 moves along... Figure 39The drum rotates in the K direction, thereby causing the drum cylinder 1 of the photosensitive drum to rotate synchronously in the K direction. The upward extension 2-6 of the photosensitive drum and the second printer drive transmission gear 22 at least partially overlap, so that the extension 2-6 and the second printer drive transmission gear 22 can abut together to generate an axial force.

[0146] Reference Figures 40 to 44 In this embodiment, the tooth thickness of the gear tooth body 2-5 is greater than the tooth thickness of the extension 2-6. The tooth thickness of the gear tooth body 2-5 is equal along the gear tooth axis. In some embodiments, a second extension may extend or form at the end of the gear tooth body 2-5 away from the extension 2-6, together forming a gear tooth.

[0147] The height (tooth height) of the gear tooth body 2-5 is greater than the height (tooth height) of the extension 2-6. The helix angle direction of the gear tooth body 2-5 is the same as that of the extension 2-6, but the helix angles of the gear tooth body 2-5 and the extension 2-6 are different.

[0148] The first printer drive transmission gear 21 and the second printer drive transmission gear 22 are helical gears, and the gear teeth are correspondingly set to helical gears for meshing transmission. When the idler gear driven by the motor on the image forming apparatus main unit rotates (rotation direction such as I direction), and drives the first printer drive transmission gear 21 to rotate, the photosensitive drum gear 2 is driven to rotate (rotation direction such as K direction); when the first printer drive transmission gear 21 rotates, it applies a thrust to the photosensitive drum gear 2 along the axis to the right away from the idler gear, and when the photosensitive drum gear 2 rotates, it applies a thrust to the first printer drive transmission gear 21 along the axis to the left towards the idler gear. Since the idler gear on the image forming apparatus main unit is set to allow a certain amount of displacement to the left, this will cause the first printer drive transmission gear 21 to move to the left along the axis towards the idler gear. To prevent the first printer drive transmission gear 21 from moving excessively, the axial force generated by the contact between the extension 2-6 and the second printer drive transmission gear 22 can make the amount of movement of the first printer drive transmission gear 21 and the second printer drive transmission gear 22 to the left along the axis toward the idler wheel reach a balanced state, thus achieving smooth operation of the drive transmission force.

[0149] In this embodiment, the gear body 2-5, the extension 2-6, and the gear body 2-1 are an integral structure. Therefore, it is not necessary to assemble the two gears coaxially. During the production and assembly of the photosensitive drum, there is no need to consider the coaxiality of the two gears during assembly, which reduces the assembly accuracy requirements of the photosensitive drum, reduces the assembly process, and helps to improve production efficiency and reduce the production cost of the photosensitive drum.

[0150] When the processing cartridge is installed in the main unit of the image forming apparatus, the photosensitive drum gear 2 meshes with the first printer drive transmission gear 21 and the second printer drive transmission gear 22. Specifically, the gear tooth body 2-5 meshes with the first printer drive transmission gear 21, and the extension 2-6 abuts against the second printer drive transmission gear 22. The extension 2-6 is located near the junction of the two gear teeth with different helix angles of the first and second printer drive transmission gears 21 and 22. Figure 39 As shown; the proximity here should include the state where the extension 2-6 is connected to the gear body 2-5 and is located on the left, right or flush with the junction of the two gear teeth with different helix angles of the first printer drive transmission gear 21 and the second printer drive transmission gear 22.

[0151] In this embodiment, the photosensitive drum gear extends outward from the gear body to an extension that abuts against the second printer drive transmission gear. The gear body and the extension replace the two photosensitive drum gears in the prior art, reducing one gear compared to the prior art. This eliminates the need to consider the coaxiality of the two gears during the photosensitive drum production and assembly process, thus lowering the assembly accuracy requirements. Furthermore, the gear body and the extension are integrated, eliminating the need for assembly and simplifying the assembly process.

[0152] In some embodiments, the length of the gear tooth body 2-5 along the photosensitive drum axis is greater than the length of the extension 2-6 along the photosensitive drum axis. Optionally, the length of the gear tooth body 2-5 along the photosensitive drum axis is less than the length of the first printer drive transmission gear 21 along the photosensitive drum axis, and the length of the extension 2-6 along the photosensitive drum axis is less than the length of the second printer drive transmission gear 22 along the photosensitive drum axis. In other embodiments, the length of the gear tooth body 2-5 along the photosensitive drum axis may also be equal to or less than the length of the extension 2-6 along the photosensitive drum axis. The gear teeth may be helical or spur teeth.

[0153] In some embodiments, the gear tooth body 2-5 and the extension 2-6 are connected by a tooth clearance notch 2-4, which is an arc surface concave inward from the tooth surface, such as... Figure 30 As shown.

[0154] Example 5

[0155] This embodiment provides a processing cartridge, which is detachably disposed in the main unit of an image forming apparatus. The main unit of the image forming apparatus is provided with a first printer drive transmission gear and a second printer drive transmission gear. The processing cartridge includes a housing and a photosensitive drum, which is rotatably supported on the housing. The photosensitive drum is the photosensitive drum described in embodiments 1, 2, 3, and 4 above. When the processing cartridge is disposed in the main unit of the image forming apparatus and is in working condition, the photosensitive drum gear or the main body of the photosensitive drum gear (the first tooth portion and the gear body in the aforementioned embodiments) meshes with the first printer drive transmission gear, and the second tooth portion or extension portion of the photosensitive drum gear abuts against the second printer drive transmission gear. The processing cartridge also includes a developing roller, a toner hopper for containing developer, and a waste toner hopper for containing waste toner. The developing roller is rotatably supported on the housing.

[0156] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photosensitive drum, applied to a processing cartridge, the processing cartridge being detachably disposed in a main unit of an image forming apparatus, the main unit of the image forming apparatus being provided with a first printer drive transmission gear and a second printer drive transmission gear; the processing cartridge comprising a photosensitive drum, the photosensitive drum comprising a drum cylinder, characterized in that: The photosensitive drum also includes a photosensitive drum gear disposed at one axial end of the drum cylinder. The photosensitive drum gear includes a gear body and gear teeth integrally connected to the gear body. The gear teeth include a gear tooth body and an extension extending from the gear tooth body. The gear tooth body meshes with a first printer drive transmission gear, and the extension abuts against a second printer drive transmission gear. The tooth thickness of the gear tooth body is greater than the tooth thickness of the extension.

2. The photosensitive drum as described in claim 1, characterized in that: The extension can extend into the second printer drive transmission gear, and the extension and the second printer drive transmission gear at least partially overlap in the photosensitive drum axis.

3. The photosensitive drum as described in claim 2, characterized in that: The thickness of the extension corresponding to the portion overlapping with the second printer drive transmission gear is less than the thickness of the gear tooth body.

4. The photosensitive drum as described in claim 2, characterized in that: The extension is located near the junction of the two teeth with different helix angles of the first printer drive transmission gear and the second printer drive transmission gear.

5. The photosensitive drum as described in claim 2, characterized in that: The extension has an abutting surface that abuts against the second printer drive transmission gear, the abutting surface being located on the left, right, or both sides of the extension.

6. The photosensitive drum as described in any one of claims 1 to 5, characterized in that: The tooth body and the extension are connected by a tooth clearance notch, which is an arc surface that is concave inward from the tooth surface.

7. The photosensitive drum as described in any one of claims 1 to 5, characterized in that: The height of the tooth body is greater than the height of the extension.

8. The photosensitive drum as described in any one of claims 1, 4, and 5, characterized in that: The thickness of the extension corresponding to the portion overlapping with the second printer drive transmission gear is less than the thickness of the gear tooth body.

9. The photosensitive drum as described in any one of claims 1 to 5, characterized in that: The length of the gear tooth body along the photosensitive drum axis is greater than the length of the extension along the photosensitive drum axis.

10. A photosensitive drum, comprising a drum cylinder, characterized in that: The photosensitive drum also includes a photosensitive drum gear disposed at one axial end of the drum cylinder. The photosensitive drum gear includes a gear body and gear teeth integrally connected to the gear body. The gear teeth include a first tooth portion and a second tooth portion, and the tooth thickness of the second tooth portion is smaller than the tooth thickness of the first tooth portion.

11. The photosensitive drum as described in claim 10, characterized in that: The first tooth and the second tooth are connected or adjacent to each other along the axial direction of the gear body, with the second tooth located at the end closer to the drum and the first tooth located at the end farther from the drum.

12. The photosensitive drum as described in claim 10, characterized in that: The second tooth is wedge-shaped.

13. The photosensitive drum as described in claim 12, characterized in that: The second tooth has at least one working surface located on the left, right, or both sides of the gear tooth.

14. The photosensitive drum as described in any one of claims 10 to 13, characterized in that: The first tooth and the second tooth are connected by a tooth clearance notch, which is an arc surface that is concave inward from the tooth surface.

15. The photosensitive drum as described in any one of claims 10 to 13, characterized in that: The tooth thickness of the second tooth gradually decreases outward from the point where the first tooth and the second tooth are connected or adjacent along the tooth axis; And / or, the tooth height of the second tooth is less than the tooth height of the first tooth.

16. The photosensitive drum as described in any one of claims 10 to 13, characterized in that: The gear teeth are helical teeth.

17. The photosensitive drum as described in any one of claims 10 to 13, characterized in that: The length of the first tooth along the axial direction of the photosensitive drum is greater than the length of the second tooth along the axial direction of the photosensitive drum.

18. The photosensitive drum as described in any one of claims 10 to 13, characterized in that: The photosensitive drum gear and the drum cylinder are connected together by a connecting part. The connecting part includes an assembly part inserted into the inner cavity of one axial end of the drum cylinder, a positioning part protruding outward from the assembly part along the axis of the connecting part, and a snap-fit ​​part disposed on the radially outer side of the positioning part. The positioning part has a structure that gradually converges from the inside to the outside along the axis of the connecting part. The inner cavity of the drum cylinder is provided with snap-fit ​​ribs or snap-fit ​​grooves that snap-fit ​​with the snap-fit ​​part. The axis of the connecting part, the axis of the photosensitive drum gear, and the axis of the drum cylinder coincide.

19. The photosensitive drum as described in claim 18, characterized in that: The positioning part is conical.

20. The photosensitive drum as described in claim 18, characterized in that: A pair of latching parts are provided on the radially outer side of the positioning part, which are symmetrically arranged with the axis of the photosensitive drum gear as the axis of symmetry. The latching parts extend outward parallel to the axis of the photosensitive drum gear.

21. A processing box, detachably disposed in a main unit of an image forming apparatus, the main unit of the image forming apparatus being provided with a first printer drive transmission gear and a second printer drive transmission gear; the processing box includes a housing and a photosensitive drum, the photosensitive drum being rotatably supported on the housing, the photosensitive drum being the photosensitive drum according to any one of claims 1 to 20; the photosensitive drum gear meshes with the first printer drive transmission gear, and the photosensitive drum gear abuts against the second printer drive transmission gear.

Images