Process cartridge

Abstract

A process cartridge (701), which is detachably mounted in an image forming device. The image forming device comprises a drive transmission unit (811), which comprises a drive force transmission member (180) and braking force engagement members (814, 818) located inside the drive force transmission member (180), the drive force transmission member (180) comprising a connecting frame (180j). The process cartridge (701) comprises: a photosensitive frame (705); a photosensitive drum (707), which is rotatably supported on the photosensitive frame (705) in an axial direction (M1); and a drum coupling (770), which is disposed at the end of the photosensitive drum (707) in a first direction (M1A) in the axial direction (M1), wherein the drum coupling (770) can move towards the drive transmission unit (811) in the first direction (M1A) so as to engage with the drive transmission unit (811), the direction opposite the first direction (M1A) in the axial direction being a second direction (M2A), and the drum coupling (770) can abut against the connecting frame (180j), and thus can receive a driving force from the connecting frame (180j) to rotate, so as to drive the photosensitive drum (707) to rotate. By means of receiving a driving force from the connecting frame (180j), the drum coupling (770) achieves the driving of the photosensitive drum (707); thus, the drum coupling (770) can have various shapes / structures, which is conducive to future upgrades.

Description

A processing box Technical Field

[0001] This application relates to the field of image forming apparatus technology, and more particularly to a processing box. Background Technology

[0002] In the existing field of electrophotographic image forming apparatuses, the electrophotographic photosensitive element (hereinafter referred to as the photosensitive drum) and the processing device acting on the photosensitive drum are integrally formed into a box (usually referred to as the processing box). This processing box can be detached from the main assembly of the image forming apparatus.

[0003] A type of drive transmission unit, such as that disclosed in Chinese Patent CN113574469A, engages with a drive force receiving unit (i.e., a coupling) on ​​a processing box via multiple components to drive and brake it. Referring to Figures 1-6, a drive transmission unit 811 disposed on the main assembly of an image forming apparatus includes a drive force transmission assembly and a braking force application assembly. The drive force transmission assembly includes a drive gear 813 and a drive force transmission member 180. The drive force transmission member 180 is provided with a drive force transmission portion 180v. The braking force application assembly includes a first braking force engagement member 814 and a second braking force engagement member 818. A drum coupling 770 is provided on the processing box. The drum coupling 770 is provided with a drive force receiving portion 770b and a braking force receiving portion 770c. The drive force receiving portion 770b is used to engage with the drive force transmission member 180 to receive drive force, and the braking force receiving portion 770c is used to engage with the first braking force engagement member 814 and the second braking force engagement member 818 to receive braking force. The drum coupling 770b needs to be engaged with the braking force application component before it can be driven; otherwise, it will produce abnormal noise during the development process. In existing designs, the drum coupling 770 that can be engaged with the braking force application component is usually driven by the driving force transmission part 180v on the driving force transmission member 180. This limits the shape of the drum coupling 770b and is not conducive to diverse subsequent upgrades.

[0004] Application content

[0005] According to one aspect of this application, a processing box is provided, detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, the drive force transmission member including a connecting frame, the processing box including:

[0006] Photosensitive frame;

[0007] The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction;

[0008] A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction.

[0009] The drum coupling can abut against the connecting frame and receive the driving force of the connecting frame to rotate, thereby driving the photosensitive drum to rotate.

[0010] In some embodiments, the drum coupling includes a main body, a idling part, and a drive part. The main body is disposed at one end of the photosensitive drum in a first direction. The idling part is capable of engaging with the braking force engagement member and idling relative to the main body. The drive part is capable of receiving the driving force of the connecting frame to drive the main body to rotate synchronously to drive the photosensitive drum.

[0011] In some embodiments, before the driving unit drives the main body to rotate synchronously, the driving unit can rotate relative to the main body while having axial movement.

[0012] In some embodiments, the drive unit is driven by the idler and / or the connecting frame to rotate relative to the main body.

[0013] In some embodiments, the idling part is provided with a mating hole, and the driving part is provided with a driving rod. When the driving part rotates and moves axially, the driving rod moves axially within the mating hole.

[0014] In some embodiments, the main body is provided with a first guide portion, and the drive portion is provided with a second guide portion that cooperates with the first guide portion. The first guide portion and the second guide portion cooperate to guide the drive portion to rotate relative to the main body while having axial movement.

[0015] In some embodiments, the idling part can rotate the drive part by abutting against the drive rod through a mating hole.

[0016] In some embodiments, the drive rod can extend out of the mating hole in a first direction to abut against the connecting bracket to receive the driving force of the connecting bracket.

[0017] In some embodiments, the drive rod has a top portion whose outer diameter decreases along the first direction.

[0018] In some embodiments, the idling part has a first rotating protrusion and the driving part has a second rotating protrusion. When the idling part is idling, the first rotating protrusion pushes the second rotating protrusion to rotate the driving part.

[0019] In some embodiments, when the mating hole abuts against the drive rod on its upstream inner wall in the rotation direction, the mating hole can push the drive rod to rotate the drive unit.

[0020] In some embodiments, the first guide portion is a guide groove provided on the inner wall of the main body portion, the guide groove extending spirally relative to the axial direction;

[0021] The second guide portion is a guide rib provided on the outer wall of the drive portion, and the guide rib extends spirally relative to the axial direction; the guide rib is adapted to the guide groove.

[0022] In some embodiments, the main body is provided with a first driving protrusion, and the driving part is provided with a second driving protrusion. When the driving part rotates relative to the main body, the first driving protrusion and the second driving protrusion are axially offset from each other.

[0023] When the driving part rotates relative to the main body and moves along the first direction, the second driving protrusion approaches the first driving protrusion in the axial direction.

[0024] When the driving part is driven by the connecting frame alone, the second driving protrusion abuts against the first driving protrusion and pushes the first driving protrusion to rotate the main body.

[0025] In some embodiments, the drum coupling further includes a rotating member that abuts against the drive unit. The rotating member has a fourth guide portion, and the idler portion is provided with a third guide portion that cooperates with the fourth guide portion. When the idler portion rotates, the fourth guide portion can push the rotating member to move axially, and the rotating member pushes the drive unit that abuts against it to move axially.

[0026] In some embodiments, the main body is provided with a drive groove, which communicates with the first guide portion. When the second guide portion moves from the first guide portion to the drive groove and abuts against it, the drive portion can drive the main body to rotate.

[0027] In some embodiments, the first guide portion is a spiral groove, and the second guide portion is a protrusion structure that can move within the first guide portion.

[0028] In some embodiments, the third guide portion is provided on the spiral groove on the circumferential wall of the idling portion, the third guide portion has the same slope as the first guide portion, and the fourth guide portion is a protruding structure that can move within the third guide portion.

[0029] In some embodiments, the drum coupling further includes an elastic element disposed between the idling section and the drive section, the elastic element being configured to apply a force toward the drive section in a second direction.

[0030] In some embodiments, the idling part is rotatably supported on the photosensitive frame, the photosensitive frame is provided with a fifth guide part, and the idling part is provided with a sixth guide part that cooperates with the fifth guide part. The cooperation between the fifth guide part and the sixth guide part enables the idling part to rotate relative to the main body while having axial movement.

[0031] In some embodiments, the idling part is provided with a mating hole, and the driving part is provided with a driving rod. When the idling part rotates and moves axially, the driving rod protrudes from the mating hole.

[0032] In some embodiments, a first elastic element is also included, disposed between the main body and the idling part, for positioning the idling part in an initial position away from the photosensitive drum in a first direction.

[0033] In some embodiments, the driving part is provided with a driving protrusion, and the main body is provided with a driving groove that cooperates with the driving protrusion. The driving part drives the main body to rotate synchronously through the abutment between the driving protrusion and the driving groove.

[0034] In some embodiments, a second elastic member is provided between the driving part and the main body part, the second elastic member positioning the driving part away from the photosensitive drum in a first direction.

[0035] In some embodiments, the mating hole abuts against the drive rod and can push the drive rod to rotate the drive unit.

[0036] In some embodiments, the idling part is provided with a force-receiving part, and a first elastic element is provided between the idling part and the photosensitive frame. The first elastic element applies a force to the idling part in the opposite direction of rotation.

[0037] In some embodiments, the driving part is rotatably disposed within the main body, the main body is provided with a first driving protrusion, the first driving protrusion is provided with a driving force receiving surface, the driving part is provided with a second driving protrusion, the second driving protrusion can contact the driving force receiving surface to push the first driving protrusion, thereby causing the main body to rotate.

[0038] In some embodiments, the main body is provided with a free-spinning groove, and the second drive protrusion is capable of moving within the free-spinning groove.

[0039] In some embodiments, a second elastic member is provided between the main body and the driving part, the second elastic member positioning the second driving protrusion away from the driving force receiving surface.

[0040] In some embodiments, the idling section includes an idling force engagement section, which is engaged with the driving force transmission section and the braking force engagement member.

[0041] According to one aspect of this application, another processing box is provided, detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, the processing box comprising:

[0042] Photosensitive frame;

[0043] The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction;

[0044] A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction.

[0045] The drum coupling is provided with a joint, which receives driving force by engaging with the second end face of the drive transmission member.

[0046] In some embodiments, the joint has a surface that is axially inclined relative to the photosensitive drum.

[0047] In some embodiments, the radial width of the joint decreases along the first direction.

[0048] In some embodiments, the joint has a first end and a second end in the axial direction, the second end being further away from the photosensitive drum than the first end, the drum coupling having a first end face in a first direction, the first end being connected to the first end face, and the second end protruding along the first direction.

[0049] In some implementations, the second end is a pointed end.

[0050] In some embodiments, the first end face is a pressing part. When the drum coupling is engaged with the drive transmission unit, the pressing part abuts against the second end face and presses the drive transmission unit to move it in the first direction.

[0051] In some embodiments, the joint includes one or more protrusions; or, the joint includes one or more annular protrusions.

[0052] In some embodiments, the drum coupling further includes a protective portion that encloses the engagement portion inside it.

[0053] In some embodiments, the protective portion is a second annular protrusion, the inner diameter of which increases along the first direction.

[0054] According to one aspect of this application, another processing box is provided, detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, the drive force transmission member including a connecting frame, the processing box including:

[0055] Photosensitive frame;

[0056] The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction;

[0057] A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction.

[0058] The drum coupling is provided with a connecting part and a pressing part. The connecting part receives driving force by engaging with the drive transmission unit. When the drum coupling is engaged with the drive transmission unit, the pressing part abuts against the drive transmission unit and presses the drive transmission unit to move it in the first direction.

[0059] In some embodiments, the joint portion is a third annular protrusion, and the pressing portion is the end face of the third annular protrusion in the first direction.

[0060] In some embodiments, the joint is provided with a notch that can engage with the connecting frame.

[0061] In some embodiments, the engagement portion includes a driving force receiving portion, which is a side surface of the notch portion in the circumferential direction. When the notch portion is engaged with the connecting frame, the driving force receiving portion abuts against the side surface of the connecting frame to receive the driving force.

[0062] In some embodiments, the braking force engagement member includes a first braking force engagement member and a second braking force engagement member, with a radial gap between the first braking force engagement member and the second braking force engagement member;

[0063] When the drum coupling engages with the drive transmission unit, the third annular protrusion is inserted into the gap.

[0064] In some embodiments, when the drum coupling engages with the drive transmission unit, the pressing portion abuts against the first braking force engagement member and / or the second braking force engagement member to push the drive transmission unit to move along the first direction.

[0065] In some embodiments, when the drum coupling engages with the drive transmission unit, the pressing portion abuts against the end face of the connecting frame in the second direction to push the drive transmission unit to move in the first direction.

[0066] In some embodiments, the engagement portion is a fourth annular protrusion, which has a notch that can engage with the driving force transmission portion on the driving transmission unit.

[0067] In some embodiments, the joint includes a driving force receiving portion, which is a side surface of the notch in the circumferential direction.

[0068] In some embodiments, the driving force receiving portion is an inclined surface that is tilted relative to the axial direction of the photosensitive drum.

[0069] In some embodiments, the joint is telescopically disposed on the drum coupling along the axial direction of the photosensitive drum.

[0070] In some embodiments, the joint includes a driving force receiving portion and an elastic portion, the elastic portion being disposed between the driving force receiving portion and the drum coupling, such that the driving force receiving portion is in an extended state.

[0071] In some embodiments, the pressing part is the end face of the drum coupling in a first direction. When the drum coupling is engaged with the drive transmission unit, the pressing part abuts against the second end face of the drive transmission member and presses the drive transmission unit to move it in the first direction.

[0072] According to one aspect of this application, another processing box is provided, detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, the processing box comprising:

[0073] Photosensitive frame;

[0074] The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction;

[0075] A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction.

[0076] The coupling includes a fixing part, which can compress the braking force engagement member so that the braking force engagement member is tightly against the inner wall of the driving force transmission member.

[0077] In some embodiments, the radial width of the fixing portion increases along the second direction.

[0078] In some embodiments, the outer surface of the fixing part away from the axis is an inclined surface, which is inclined relative to the axial direction.

[0079] In some embodiments, the fixing part includes a second part and a first part that are connected and disposed along the first direction.

[0080] In some embodiments, the drum coupling has a first end face perpendicular to the axial direction, and the angle between the outer side of the first portion and the first end face is larger than the angle between the outer side of the second portion and the first end face.

[0081] In some embodiments, the drum coupling includes a engagement portion capable of engaging with the braking engagement member to receive driving force.

[0082] In some embodiments, the joining portion and the fixing portion are arranged alternately in the rotational direction.

[0083] In some embodiments, the radial width of the joint is greater than the maximum radial width of the fixing portion.

[0084] In some embodiments, the drum coupling includes a guide for moving the braking force engagement member relative to the driving force transmission member.

[0085] In some embodiments, the radial width of the guide portion is smaller than the maximum radial width of the fixing portion.

[0086] The beneficial effects of this application are as follows: This solution receives the driving force of the connecting frame through the driving rod of the driving part to drive the photosensitive drum, and sets up an idle part to engage with the braking force engagement component, which solves the problem of abnormal noise. The engagement and separation of braking and driving make the shape / structure of the drum coupling more diverse, which is beneficial for future upgrades. Attached Figure Description

[0087] Figure 1 is a schematic diagram of the structure of the image forming apparatus in the prior art CN113574469A;

[0088] Figure 2 is a schematic diagram of the processing box of prior art CN113574469A being installed in an image forming apparatus;

[0089] Figure 3 is a schematic diagram of the drive transmission unit in the prior art CN113574469A;

[0090] Figure 4 is a cross-sectional view of the drive transmission unit of the prior art CN113574469A;

[0091] Figure 5 is a schematic diagram of the drive transmission unit (only a part of the structure is shown) of the prior art CN113574469A;

[0092] Figure 6 is a structural schematic diagram of the drum coupling in the prior art CN113574469A;

[0093] Figure 7 is a schematic diagram of the overall structure of the processing box at one angle according to Embodiment 1 of this application;

[0094] Figure 8 is a schematic diagram of the overall structure of the processing box from another angle in Embodiment 1 of this application;

[0095] Figure 9 is a structural schematic diagram of the drum coupling in the initial position according to Embodiment 1 of this application;

[0096] Figure 10 is a schematic diagram of the drum coupling in the engaged state according to Embodiment 1 of this application;

[0097] Figure 11 is an exploded view of the drum coupling of Embodiment 1 of this application;

[0098] Figure 12 is a structural schematic diagram of the main body of Embodiment 1 of this application from one angle;

[0099] Figure 13 is a structural schematic diagram of the main body of Embodiment 1 of this application from another angle;

[0100] Figure 14 is a schematic diagram of the structure of the idler section in Embodiment 1 of this application;

[0101] Figure 15 is a structural schematic diagram of the drive unit at one angle according to Embodiment 1 of this application;

[0102] Figure 16 is a structural schematic diagram of the drive unit from another angle in Embodiment 1 of this application;

[0103] Figure 17 is a cross-sectional view of the drum coupling in the initial position according to Embodiment 1 of this application;

[0104] Figure 18 is a cross-sectional view of the drum coupling of Embodiment 1 of this application in the engaged state;

[0105] Figure 19 is a cross-sectional view of the drum coupling and drive transmission unit of Embodiment 1 of this application at an angle;

[0106] Figure 20 is an enlarged view of point A in Figure 19;

[0107] Figure 21 is a cross-sectional view of the drum coupling and drive transmission unit of Embodiment 1 of this application from another angle;

[0108] Figure 22 is a structural schematic diagram of the drum coupling in the initial position according to Embodiment 2 of this application;

[0109] Figure 23 is a schematic diagram of the drum coupling in the engaged state according to Embodiment 2 of this application;

[0110] Figure 24 is an exploded view of the drum coupling of Embodiment 2 of this application;

[0111] Figure 25 is a structural schematic diagram of the main body of Embodiment 2 of this application;

[0112] Figure 26 is a structural schematic diagram of the idler section at one angle according to Embodiment 2 of this application;

[0113] Figure 27 is a structural schematic diagram of the idler section from another angle in Embodiment 2 of this application;

[0114] Figure 28 is a schematic diagram of the drive unit in Embodiment 2 of this application;

[0115] Figure 29 is a schematic diagram of the connection between the drum coupling and the drive transmission unit in Embodiment 2 of this application;

[0116] Figure 30 is a schematic diagram of the structure of the drum coupling according to Embodiment 3 of this application;

[0117] Figure 31 is an exploded view of the drum coupling according to Embodiment 3 of this application;

[0118] Figure 32 is a schematic diagram of the main body of Embodiment 3 of this application;

[0119] Figure 33 is a schematic diagram of the structure of the idler section in Embodiment 3 of this application;

[0120] Figure 34 is a structural schematic diagram of the first support member in Embodiment 3 of this application;

[0121] Figure 35 is a schematic diagram of the drive unit in Embodiment 3 of this application;

[0122] Figure 36 is a cross-sectional view of the drum coupling and the driving force transmission component at an angle according to Embodiment 3 of this application;

[0123] Figure 37 is a cross-sectional view of the drum coupling and the driving force transmission component of Embodiment 3 of this application from another angle;

[0124] Figure 38 is a schematic diagram of the processing box in Embodiment 4 of this application;

[0125] Figure 39 is an enlarged view of point B in Figure 38;

[0126] Figure 40 is a schematic diagram of the structure of the drum coupling in Embodiment 4 of this application;

[0127] Figure 41 is a schematic diagram of the main body of Embodiment 4 of this application;

[0128] Figure 42 is a schematic diagram of the structure of the idler section in Embodiment 4 of this application;

[0129] Figure 43 is a structural schematic diagram of the first support member in Embodiment 4 of this application;

[0130] Figure 44 is a structural schematic diagram of the driving part at one angle according to Embodiment 4 of this application;

[0131] Figure 45 is a structural schematic diagram of the drive unit from another angle in Embodiment 4 of this application;

[0132] Figure 46 is a schematic diagram of the cooperation between the drive unit and the main body unit in Embodiment 4 of this application;

[0133] Figure 47 is a cross-sectional view of the engagement of the drive unit and the main body in Embodiment 4 of this application;

[0134] Figure 48 is a cross-sectional view of the engagement of the drum coupling and the driving force transmission component in Embodiment 4 of this application;

[0135] Figure 49 is a schematic diagram of the overall structure of the processing box at one angle according to Embodiment 5 of this application;

[0136] Figure 50 is an exploded view of the drum coupling and photosensitive drum of Embodiment 5 of this application;

[0137] Figure 51 is a schematic diagram of the processing box and the drive transmission unit in Embodiment 5 of this application;

[0138] Figure 52 is an enlarged schematic diagram of point C in Figure 51;

[0139] Figure 53 is a schematic diagram of the engagement of the drum coupling and the drive transmission unit in Embodiment 5 of this application;

[0140] Figure 54 is a schematic diagram of the structure of a modified example of the drum coupling of Embodiment 5 of this application;

[0141] Figure 55 is a schematic diagram of the engagement of the drum coupling and the drive transmission unit in a modified example of Embodiment 5 of this application;

[0142] Figure 56 is a schematic diagram of the structure of the drum coupling in Embodiment Six of this application;

[0143] Figure 57 is a schematic diagram of the engagement of the drum coupling and the drive transmission unit in Embodiment 6 of this application;

[0144] Figure 58 is a schematic diagram of the processing box in Embodiment 7 of this application;

[0145] Figure 59 is a schematic diagram of the drum coupling of Embodiment 7 of this application;

[0146] Figure 60 is a cross-sectional view of the drum coupling and drive transmission unit in Embodiment 7 of this application;

[0147] Figure 61 is an enlarged schematic diagram of point D in Figure 60;

[0148] Figure 62 is a schematic diagram of the engagement between the joint and the drive transmission unit in Embodiment 7 of this application;

[0149] Figure 63 is a schematic diagram of the engagement between the joint and the drive transmission unit in Embodiment 7 of this application, with the braking force application component omitted in the figure;

[0150] Figure 64 is a cross-sectional view of the non-driving end of the processing box in Embodiment 7 of this application;

[0151] Figure 65 is a structural schematic diagram of the drum coupling of Embodiment 8 of this application;

[0152] Figure 66 is a cross-sectional view of the joint and the drive transmission unit in Embodiment 8 of this application;

[0153] Figure 67 is a cross-sectional view of the drum coupling and drive transmission unit in Embodiment 8 of this application;

[0154] Figure 68 is a structural schematic diagram of the drum coupling of Embodiment 9 of this application;

[0155] Figure 69 is a partially exploded view of the drum coupling of Embodiment 9 of this application;

[0156] Figure 70 is a cross-sectional view of the drum coupling of Embodiment 9 of this application;

[0157] Figure 71 is a cross-sectional view of the joint and the drive transmission unit in Embodiment 9 of this application;

[0158] Figure 72 is a cross-sectional view of the drum coupling and drive transmission unit in Embodiment 9 of this application;

[0159] Figure 73 is a schematic diagram of the overall structure of the processing box from another angle according to Embodiment Eleven of this application;

[0160] Figure 74 is a schematic diagram of the overall structure of the drum coupling according to Embodiment Eleven of this application;

[0161] Figure 75 is a partial structural schematic diagram of the drum coupling of Embodiment Eleven of this application;

[0162] Figure 76 is an axial front view of the drum coupling according to Embodiment Eleven of this application;

[0163] Figure 77 is a cross-sectional view of the drum coupling and drive transmission unit of Embodiment 11 of this application at an angle;

[0164] Figure 78 is a cross-sectional view of the drum coupling and drive transmission unit of Embodiment 11 of this application from another angle;

[0165] Figure 79 is an enlarged schematic diagram of point E in Figure 78. Detailed Implementation

[0166] The present application will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0167] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0168] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., 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, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0169] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0170] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0171] The image forming apparatus (also called an imaging apparatus or electronic imaging apparatus) in this embodiment can be a copier, fax machine, printer (laser beam printer, LED printer, etc.), multifunction printer, etc. This application uses a laser beam printer as an example for description. The processing cartridge can be removed from the main assembly of the image forming apparatus. When the consumables in the processing cartridge are used up, the old processing cartridge needs to be removed and a new processing cartridge needs to be installed. The processing cartridge contains developer (e.g., toner), and the processing cartridge can also be called a "consumable cartridge," "cartridge," "toner container," "toner box," etc. In this embodiment, the detachable component can also be the drum unit 704. When replacing the drum unit 704, the drum unit 704 on the original consumable cartridge is removed, and then the new drum unit 704 is installed on the processing cartridge, and then the processing cartridge is reinstalled on the main assembly of the device.

[0172] The main component of the image forming apparatus in this embodiment adopts a main component in the prior art, such as the main component 800 disclosed in Chinese patent application CN113574469A. It engages with a coupling on the processing cartridge 701 through multiple components for driving and braking. Referring to Figures 1 and 2, the image forming apparatus includes a main component 800 and a cartridge door 804. The main component 800 is provided with a receiving portion, a drive transmission unit 811, a separation mechanism, and a transfer unit, etc. The cartridge door 804 is located on the outside of the main component 800 and can open or close the receiving portion of the main component 800. When the cartridge door 804 is open, the lower guide rail 805 guiding the processing cartridge 701 is provided on the bottom surface of the space, and the upper guide rail 806 is provided on the upper surface. The cartridge 701 is guided to the installation position by the upper and lower guide rails (805, 806) provided above and below the space, that is, the cartridge 701 can be installed into the main component 800 along the length direction (Z1 direction) of the cartridge.

[0173] Referring to Figures 3 to 5, the drive transmission unit 811 disposed on the main component 800 includes a drive force transmission component and a braking force application component. The drive force transmission component includes a drive gear 813 and a drive force transmission member 180. The drive gear 813 is rotatably supported on a support shaft 812, and the support shaft 812 abuts against a first machine baffle 822. The drive force transmission member 180 includes a cylindrical portion 180c. One end of the drive force transmission member 180 is provided with a drive force transmission part 180v, and the other end of the drive force transmission member 180 is fixedly connected to the drive gear 813 (preferably the drive gear 813 and the drive force transmission member 180 are integrally disposed), so that the drive gear 813 and the drive force transmission member 180 rotate together.

[0174] The braking force application assembly includes a braking member 816, a first braking force engagement member 814, a second braking force engagement member 818, a braking engagement spring 821, a drum drive coupling spring 820, and a braking transmission member 817. The braking member 816 includes a fixed side and a rotating side. The fixed side is fixedly connected to the support shaft 812, and the rotating side is capable of rotating relative to the fixed side to generate braking force. The method of generating braking force can be appropriately selected from those methods that use friction and viscosity.

[0175] The first braking force engagement member 814 and the second braking force engagement member 818 are used to apply braking force to the processing box 701. They can be assembled together by engaging the rotation stop protrusion and the rotation stop recess, and they can have synchronous operation. The second braking force engagement member 818 is located inside the first braking force engagement member 814, and the engagement portion of the first braking force engagement member 814 can fit against or abut against the drive force transmission part 180v.

[0176] The axial portion of the brake transmission member 817 passes through a mating hole in the middle of the first brake force engagement member 814 and the second brake force engagement member 818 and connects to the rotational side of the brake member 816, so as to transmit braking force to the first brake force engagement member 814 and the second brake force engagement member 818. The first brake force engagement member 814 and the second brake force engagement member 818 are movable along the rotation axis M1 of the drive transmission unit 811, and the axis M1 is parallel to the Z1 and Z2 directions.

[0177] Specifically, the brake transmission member 817 is provided with a protrusion, and the corresponding first brake force engagement member 814 is also provided with a protrusion. When the protrusion of the brake transmission member 817 engages with the protrusion of the first brake force engagement member 814, the brake transmission member 817 can transmit braking force to the first brake force engagement member 814.

[0178] The first braking force engagement member 814 and the second braking force engagement member 818 are movable relative to the brake transmission member 817 and the brake member 816 in the axial direction M1. When the protrusion of the brake transmission member 817 is misaligned or separated from the protrusion of the first braking force engagement member 814 in the axial direction M1, the second braking force engagement member 818 and the first braking force engagement member 814 will not receive braking force.

[0179] Continuing, referring to Figures 3 and 4, one end of the brake engagement spring 821 presses against the end face of the brake member 816, and the other end presses against the flange portion of the first braking force engagement member 814. The brake engagement spring 821 is in a compressed state, and it applies an elastic force to the first braking force engagement member 814 along the M1B direction (i.e., the Z2 direction). This elastic force allows the brake transmission member 817 to remain engaged with the first braking force engagement member 814.

[0180] Referring to Figure 4, the brake engagement spring 821 controls the extension and retraction of the drive force transmission member 180 and the drive gear 813. In the initial state, the drive gear 813 abuts against the second machine baffle 823 and is limited by it under the elastic action of the brake engagement spring 821. When the drive force transmission member 180 and / or the drive gear 813 are subjected to external force and move in the direction of M1A, the brake engagement spring 821 is compressed, so the drive gear 813 can move in the directions of M1A and M1B.

[0181] The drum drive coupling spring 820 is a compression helical spring and is configured to be sandwiched and compressed between the end face of the brake member 816 and the flange portion of the brake transmission member 817. The drum drive coupling spring 820 applies a repulsive force (pushing force, elastic force) to each of the end face of the brake member 816 and the flange portion of the brake transmission member 817.

[0182] The drive transmission unit 811 also includes a stop 815 assembled into the drive force transmission member 180 and fixed to move integrally with the drive force transmission member 180 in the axial direction MI. This prevents the drum coupling from colliding with the first brake engagement member 814 and prevents the first brake engagement member 814 from disengaging from the drive force transmission member 180 when the user installs the box with force.

[0183] In each component of the drive transmission unit 811 described above, the first braking force engagement member 814 and the second braking force engagement member 818 are movable relative to the brake transmission member 817 and the drive gear 813 in the M1A (Z1 direction) and M1B (Z2 direction) directions, and are also movable relative to the drive force transmission member 180 in the M1A and M1B directions.

[0184] Referring to Figure 5, the driving force transmission component 180 includes a driving force transmission part 180v, a positioning boss 180i, and a connecting frame 180j. The driving force transmission part 180v is a protruding structure disposed on the inner wall of the driving force transmission component 180. The driving force transmission part 180v includes a driving transmission surface 180d, which is a side surface of the driving force transmission part 180v in the circumferential direction. The driving force transmission part 180v also includes a driving transmission inclined surface 180f, which is a surface on the driving force transmission part 180v (protruding structure) facing the M1B direction. The driving transmission inclined surface 180f is inclined relative to the axial direction M1, and one end of the driving transmission inclined surface 180f is connected to the driving transmission surface 180d. The positioning boss 180i is located at the central axis position of the driving force transmission component 180, and the connecting frame 180j connects the positioning boss 180i and the driving force transmission part 180v.

[0185] The first braking engagement member 814 has two engagement portions that protrude in the form of claws towards the processing box and engage with the drum coupling. The second braking engagement member 818 has two engagement portions that protrude in the form of claws towards the processing box and engage with the drum coupling. The engagement portions extend outward and are exposed through a through hole between the connecting bracket 180j and the cylindrical portion 180c.

[0186] Referring to Figures 7 and 8, the processing cartridge of this embodiment includes a drum unit 704 and a developing unit 706, which are pivotally connected around a rotating support pin 730. The length direction of the processing cartridge is defined as the Z direction (Z1 and Z2 directions), the width direction as the X direction (X1 and X2 directions), and the height direction as the Y direction (Y1 and Y2 directions), wherein the X, Y, and Z directions are mutually perpendicular. When the processing cartridge is installed in the main assembly 800 of the image forming apparatus along the Z1 direction, the length direction (Z direction) is parallel to the axial direction M1 of the drive transmission unit 811.

[0187] Referring to Figures 7 and 8, the drum unit 704 includes a photosensitive frame 705 (one of the processing cartridge housings), a photosensitive drum 707 rotatably supported on the photosensitive frame 705, a charging roller, and a drum coupling 770 disposed at the end of the photosensitive drum 707. The drum coupling 770 engages with the drive transmission unit 811 of the main assembly to receive driving force, thereby driving the photosensitive drum 707 to rotate. A first support member 733R and a second support member 733L are connected to both ends of the photosensitive frame 705 along its length. The drum coupling 770 is supported by the first support member 733R (i.e., the driving end supporting the photosensitive drum), and the other end (non-driving end) of the photosensitive drum 707 is supported by the second support member. The axial direction of the photosensitive drum 707 extends along the M1A direction (Z1 direction) and the M1B direction (Z2 direction). The M1A direction is also the direction in which the drum coupling 770 is closer to the drive transmission unit 811, and is also called the first direction. The M1B direction is also the direction in which the drum coupling 770 is farther away from the drive transmission unit 811, and is also called the second direction.

[0188] The developing unit 706 includes a developing frame 716 (one of the processing cartridge housings), a developing roller rotatably supported on the developing frame 716, and a developing drive force receiving unit. The developing drive force receiving unit engages with a developing drive force transmission unit on the main assembly to receive driving force, thereby driving the developing roller to rotate. Specifically, the photosensitive drum 707 and the developing roller are both positioned above the processing cartridge in the height direction (on one side in the Y1 direction).

[0189] Referring to Figures 9-18, in this embodiment, the drum coupling 770 includes a main body 7701, an idle part 7702, a drive part 7703, and an elastic element 7704.

[0190] Referring to Figures 9-13, the main body 7701 includes a mounting portion 7701a, a cylindrical portion 7701b, a baffle portion 7701c, a first guide portion 7701d, a first drive protrusion 7701e, and a first connecting portion 7701f. The mounting portion 7701a is located at one end of the main body 7701 facing the photosensitive drum 707 (i.e., the end in the M1B direction). The mounting portion 7701a is used to connect with the photosensitive drum 707, thereby fixing the main body 7701 to one end of the photosensitive drum 707. Specifically, the mounting portion 7701a is a cylindrical / cylindrical structure adapted to the photosensitive drum 707. During assembly, the mounting portion 7701a is inserted into the photosensitive drum 707 and fastened within it by an interference fit. It can also be fixed by snap-fit, adhesive, screwing, or other methods. The baffle portion 7701c is provided at one end of the mounting portion 7701a in the M1A direction. The outer diameter of the baffle portion 7701c is larger than the outer diameter of the mounting portion 7701a. When the mounting portion 7701a is inserted into the photosensitive drum 707, the baffle portion 7701c abuts against the end face of the photosensitive drum 707 in the M1B direction, thereby defining the position of the main body portion 7701. The cylindrical portion 7701b is disposed on the M1A direction side of the baffle portion 7701c. The cylindrical portion 7701b extends in a direction away from the photosensitive drum 707 (M1A direction, first direction). The interior of the cylindrical portion 7701b is hollow and forms two parts with different inner diameters, namely the first part 77011b and the second part 77012b. The first part 77011b is disposed near the M1A direction end of the cylindrical portion 7701b, and the second part 77012b is located on the M1B direction side of the first part 77011b. The inner diameter of the first part 77011b is smaller than the inner diameter of the second part 77012b. The first guide portion 7701d is disposed on the inner wall of the first part 77011b. The first guide portion 7701d is a guide groove that extends obliquely relative to the axial direction M1 of the main body 7701. That is, the guide groove extends spirally along the inner wall of the first part 77011b. The M1A direction end of the first guide portion 7701d (the end away from the photosensitive drum 707) is located on the downstream side of its M1B end (the end close to the photosensitive drum 707) in the rotation direction A. The first driving protrusion 7701e is a protrusion structure provided on the inner wall of the second part 77012b of the cylindrical part 7701b. The first driving protrusion 7701e protrudes radially on the inner wall of the second part 77012b, but the inner wall of the first driving protrusion 7701e does not protrude from the inner wall of the first part 77011b. In the axial direction (M1 direction), the first driving protrusion 7701e abuts against the M1B direction end face of the first part 77011b. There are two first driving protrusions 7701e, and the two first driving protrusions 7701e are arranged in a centrally symmetrical manner.The first connecting part 7701f is provided on the outer side of the M1A direction end of the cylindrical part 7701b. The first connecting part 7701f is used to rotatably connect with the idling part 7702, so that the idling part 7702 can rotate relative to the main body part 7701.

[0191] Referring to Figures 9-11 and 14, the idling part 7702 includes an idling base 7702a, an idling force receiving part 7702b, a limiting part 7702c, an idling guide part 7702d, a mating hole 7702e, a first connecting post part 7702f, and a first rotating protrusion 7702g. The idling base 7702a is generally a disc-shaped structure. The idling base 7702a can be fitted onto the first connecting part 7701f of the cylindrical part 7701b. One of the first connecting part 7701f and the idling base 7702a is provided with an annular groove (not shown), and the other is provided with an annular protrusion (not shown) that matches the annular groove. The annular groove and the annular protrusion engage, thereby realizing the relative rotation of the idling part 7702 and the main body 7701, and the idling part 7702 will not detach from the main body 7701 along the axial direction. The idle force receiving part 7702b, the limiting part 7702c, and the idle guide part 7702d are all provided on the end face of the idle base 7702a in the M1A direction. The idle force receiving part 7702b, the limiting part 7702c, and the idle guide part 7702d have the same structure and function as the components on the drum coupling in CN113574469A (as shown in Figure 6). Among them, the limiting part 7702c is equivalent to component 770a in Figure 6. The limiting part 7702c is used to cooperate with the positioning boss 180i of the drive force transmission component 180 to position the drive force transmission component 180. The idle guide part 7702d is equivalent to components 770d and 770g in Figure 6. It is used to guide the first braking force engagement component 814 and the second braking force engagement component 818 so that the idle force receiving part 7702b can smoothly... The idling force receiving part 7702b engages with the first braking force receiving member 814 and the driving force transmission part 180v. The idling force receiving part 7702b is a protruding structure radially projecting from the outer wall of the limiting part 7702c. Its surface on the upstream side of the rotation direction A (equivalent to 770b in Figure 6) is in contact with the driving transmission surface 180d of the driving force transmission part 180v, thereby receiving driving force to allow the idling part 7702 to idle relative to the main body part 7701. The surface of the idling force receiving part 7702b on the downstream side of the rotation direction A (equivalent to 770c in Figure 6) is in contact with the engaging portion of the first braking force receiving member 814 to receive braking force, thus preventing abnormal noise during rotation. Two idling force receiving parts 7702b and two idling guide parts 7702d are provided, and both are centrally symmetrically arranged. The mating hole 7702e penetrates axially through the end face of the idling base 7702a and the idling force receiving part 7702b. Two mating holes 7702e are provided, each penetrating through one of the two idling force receiving parts 7702b. The first connecting post 7702f is provided on the end face of the idling base 7702a in the M1B direction. The first connecting post 7702f is a cylindrical structure, located at the central axis of the idling base 7702a and extending along the M1B direction.The first rotating protrusion 7702g is disposed on the circumferential surface of the M1B direction end of the first connecting post 7702f. The first rotating protrusion 7702g protrudes radially along the first connecting post 7702f. There are two first rotating protrusions 7702g, and the two first rotating protrusions 7702g are arranged in a centrally symmetrical manner.

[0192] Referring to Figures 9-13 and 15-16, the drive unit 7703 includes a rotating part 7703a, a drive rod 7703b, a second guide part 7703c, a second drive protrusion 7703d, and a second rotating protrusion 7703e. The rotating part 7703a is a cylindrical component with a hollow interior. It has two parts with different inner diameters: a third part 77031a and a fourth part 77032a. The third part 77031a is located on the M1A side, and the fourth part 77032a is located on the M1B side. The inner diameter of the third part 77031a is smaller than that of the fourth part 77032a. The inner diameter of the third part 77031a is adapted to the outer diameter of the first connecting column 7702f. The third part 77031a is also provided with a clearance groove 77033a, which extends axially to avoid the first rotating protrusion 7702g, so that the first connecting column 7702f can be smoothly inserted into the drive part 7703. The outer diameter of the rotating part 7703a is adapted to the inner diameter of the first part 77011b of the main body 7701. When the driving part 7703 is installed inside the main body 7701, the outer wall of the rotating part 7703a fits against the inner wall of the first part 77011b. The second guide portion 7703c is disposed on the outer circumferential surface of the rotating portion 7703a and is disposed near the M1A direction end of the rotating portion 7703a. The second guide portion 7703c is a guide rib that extends obliquely relative to the axial direction M1 of the rotating portion 7703a, that is, the guide rib extends spirally along the outer wall of the rotating portion 7703a. The M1A direction end of the guide rib (the end away from the photosensitive drum 707) is located on the downstream side of its M1B end (the end near the photosensitive drum 707) in the rotation direction A, and the guide rib is adapted to the guide groove (the first guide portion 7701d) (having the same slope). When the driving portion 7703 is assembled with the main body portion 7701, the second guide portion 7703c is embedded in the first guide portion 7701d. The second driving protrusion 7703d is disposed on the outer circumferential surface of the rotating part 7703a at the M1B direction end. The second driving protrusion 7703d protrudes radially, and there are two second driving protrusions 7703d arranged centrally symmetrically. The second rotating protrusion 7703e is disposed on the inner wall of the fourth part 77032a of the rotating part 7703a. The second rotating protrusion 7703e has a rib structure, which protrudes radially and extends axially. When the first connecting column 7702f is assembled in the rotating part 7703a, the first rotating protrusion 7702g can abut against the second rotating protrusion 7703e in the rotation direction A.A drive rod 7703b is disposed on the end face of the rotating part 7703a in the M1A direction. The drive rod 7703b extends along the M1A direction and at least part of it can be inserted into the mating hole 7702e of the idling part 7702. The drive rod 7703b has a rod body 77031b and a top end 77032b. The rod body 77031b is a cylindrical rod, with its M1B end connected to the end face of the rotating part 7703a and its M1A end connected to the top end 77032b. The top end 77032b is frustum-shaped, and its outer diameter gradually decreases along the first direction (M1A direction). That is, the outer diameter of the top end 77032b is largest at the end closer to the photosensitive drum 707 and smallest at the end farther away from the photosensitive drum 707. The outer diameter of the M1B end of the top end 77032b is equal to the outer diameter of the rod body 77031b. The diameter of the mating hole 7702e is larger than the outer diameter of the rod body 77031b, allowing the drive rod 7703b to have a certain degree of freedom in the rotational direction A within the mating hole 7702e. Alternatively, the top part can also be hemispherical or other shapes, as long as its outer diameter decreases along the M1A direction.

[0193] Referring to Figures 11 and 17-18, an elastic element 7704 is disposed between the drive unit 7703 and the idling unit 7702. The elastic element 7704 is configured to apply a force to the drive unit 7703, causing it to move in the M1B direction, and to keep the drive unit 7703 at its furthest point in the second direction (M1B direction) (i.e., the position closest to the photosensitive drum 707, i.e., the initial position) without being subjected to other external forces. Preferably, the elastic element 7704 is a compression spring, but it can also be a torsion spring or other components. As shown in Figure 15, the rotating part 7703a is provided with a mounting groove 7703f for mounting the elastic member 7704. The mounting groove 7703f is recessed from the M1A end face of the rotating part 7703a in the direction close to the photosensitive drum 707. The mounting groove 7703f is an annular groove structure. The elastic member 7704 is sleeved in the mounting groove 7703f, with one end abutting the bottom of the mounting groove 7703f and the other end abutting the M1B end face of the idle base 7702a. The elastic member 7704 is constructed to be in a compressed state, thereby continuously applying pressure along the direction of the drive part 7703. The force in the M1B direction keeps the drive part 7703 in the initial position. At this time, the top part 77032b of the drive rod 7703b does not extend out of the M1A direction end of the mating hole 7702e. The second rotating protrusion 7703e is in a position that can abut against the first rotating protrusion 7702g in the rotation direction A. The second drive protrusion 7703d is axially offset from the first drive protrusion 7701e. The two are in a position that cannot abut against each other in the rotation direction A. The second drive protrusion 7703d is located on the M1B direction side of the first drive protrusion 7701e.

[0194] Referring to Figure 1-21, when the drum coupling 770 is in its initial position and moves along the M1A direction (first direction) with the processing box to engage with the drive force transmission member 180, the idler part 7702 first engages with the drive force transmission member 180, and the idler force receiving part 7702b is embedded between the first braking force engaging member 814 and the drive force transmission part 180v and abuts against both. Alternatively, the idler guide part 7702d first guides the first braking force engaging member 814 and the second braking force engaging member 818 away from the drive force transmission part 180v, and then the idler force receiving part 7702b is embedded between the first braking force engaging member 814 and the drive force transmission part 180v and abuts against both. The engagement process of the idler part 7702 and the drive force transmission member 180 is the same as described in CN113574469A, and will not be described in detail here.

[0195] Referring to Figures 9-10 and 17-21, after the idler part 7702 is engaged with the driving force transmission member 180, the driving force transmission member 180v drives the idler part 7702 to rotate in the rotation direction A. Since there is no driving force transmission between the idler part 7702 and the main body 7701, the idler part 7702 will not directly drive the main body 7701 to rotate (the idler part 7702 idles relative to the main body 7701). However, the idler part 7702 will push the second rotating protrusion 7703e and the mating hole 7702e through the first rotating protrusion 7702g. The drive rod 7703b is driven (at this time, the inner wall 77021e of the mating hole 7702e in the upstream direction of rotation A abuts against the drive rod 7703b), thereby driving the drive part 7703 to rotate. As the drive part 7703 starts to rotate, the main body 7701 remains stationary. The second guide part 7703c on the drive part 7703 moves along the first guide part 7701d, causing the drive part 7703 to rotate while moving in the first direction (M1A direction). The drive rod 7703b gradually extends into the mating hole 7702e, and the elastic element 7704 is compressed. Because the drive rod 7703b does not extend far enough into the mating hole 7702e during the initial engagement, the force applied by the drive rod 7703b alone is not stable enough. Therefore, the first rotating protrusion 7702g and the mating hole 7702e are needed to jointly drive the drive part 7703 to rotate. As the drive rod 7703b moves along the first direction (M1A direction) until the M1A end face of the top part 77032b is flush with the M1A end face of the mating hole 7702e, the second rotating protrusion 770... The M1B end of 3e will pass over the M1A end of the first rotating protrusion 7702g. That is, in the axial direction, the second rotating protrusion 7703e and the first rotating protrusion 7702g are offset from each other. The second rotating protrusion 7703e is located on the M1A direction side of the first rotating protrusion 7702g. The second rotating protrusion 7703e and the first rotating protrusion 7702g are disengaged from each other. At this time, the drive part 7703 is rotated only by the contact between the mating hole 7702e and the drive rod 7703b.

[0196] Referring to Figures 17-21, as the idler 7702 and drive 7703 continue to rotate, the drive 7703 moves further along the first direction (M1A direction), and the second drive protrusion 7703d on the drive 7703 gradually approaches the first drive protrusion 7701e of the main body 7701 in the axial direction. The elastic element 7704 is further compressed, and the drive rod 7703b also moves further along the first direction (M1A direction). Its top end 77032b extends out of the end face of the mating hole 7702e, reaching a position where it can abut against the connecting frame 180j. In the axial direction, when the M1A end face of the top end 77032b is about to pass the M1B end face of the connecting frame 180j, the mating hole 7702e in the rotation direction... The upstream inner wall 77021e of A is located upstream of the downstream side wall 1801j of the connecting frame 180j in the rotation direction A. That is, the upstream inner wall 77021e and the downstream side wall 1801j have a first gap in the rotation direction A. The difference between the radius of the M1B direction end of the top part 77032b of the drive rod 7703b (i.e. the radius of the rod body 77031b) and the radius of the M1A end of the top part 77032b is equal to the value of the first gap. Therefore, when the M1A end face of the top part 77032b contacts the downstream side wall 1801j of the connecting frame 180j, the upstream inner wall 77021e of the mating hole 7702e and the downstream side wall 1801j of the connecting frame 180j simultaneously push the drive rod 7703b.

[0197] Referring to Figures 17-21, as the drive rod 7703b moves further along the first direction (M1A direction), the outer wall of the top end 77032b abuts against the downstream side wall 1801j of the connecting frame 180j and slides relative to the downstream side wall 1801j along the M1A direction. Since the outer diameter of the top end 77032b gradually increases, during the relative sliding process between the downstream side wall 1801j and the top end 77032b, a pushing force is exerted on the drive rod 7703b. This pushing force has a component along the rotational direction A and an axial component. This component along the rotational direction A is superimposed on the rotational pushing force of the downstream side wall 1801j on the top end 77032b, causing the rotational speed of the drive rod 7703b in the rotational direction A to be slightly greater than the rotational speed of the driving force transmission member 180. Meanwhile, the idle part 7702 continues to rotate at the rotational speed of the driving force transmission member 180. Therefore, the driving rod 7703b will leave the upstream inner wall 77021e of the mating hole 7702e in the rotation direction A (disengagement from contact). After that, the M1B end face of the top part 77032b also passes over the downstream side wall 1801j of the connecting frame 180j. The rod part 77031b of the driving rod 7703b abuts against the downstream side wall 1801j of the connecting frame 180j. The connecting frame 180j drives the driving part 7703 to rotate independently. At this time, the second driving protrusion 7703d on the driving part 7703 abuts against the first driving protrusion 7701e on the main body part 7701 and pushes the first driving protrusion 7701e, causing the main body part 7701 to rotate, thereby driving the photosensitive drum 707 and making the processing box work.

[0198] Subsequently, the idler unit 7702 rotates along rotation direction A under the drive of the drive force transmission unit 180v, the drive unit 7703 rotates along rotation direction A under the drive of the connecting frame 180j, and the main body 7701 rotates along rotation direction A under the drive of the drive unit 7703. By engaging the idler unit 7702 with the braking force engagement member, the abnormal noise problem is solved, and the drive force of the connecting frame 180j is received through the drive rod 7703b of the drive unit 7703, thus driving the photosensitive drum 707. The engagement and separation of braking and driving allow for diverse shapes / structures of the drum coupling 770.

[0199] During the engagement process, the connecting frame 180j restricts the drive rod 7703b in the rotation direction A, preventing both the drive rod 7703b and the drive unit 7703 from rotating back to their original positions. However, once the processing box is removed, the restriction of the connecting frame 180j disappears, the idler part 7702 disengages, the elastic element 7704 recovers its deformation, pushing the drive unit 7703 to rotate in the opposite direction of rotation A. With the cooperation of the second guide part 7703c and the first guide part 7701d, the drive unit 7703 returns to its initial position.

[0200] Example 2

[0201] This embodiment provides another processing box, which differs from the first embodiment in that the structure of the drum coupling is different.

[0202] Referring to Figures 22-23, in this embodiment, the drum coupling 770 includes a main body 7701, a drive part 7703, a rotating part 7705, and an idle part 7702.

[0203] Referring to Figures 22-25, the main body 7701 includes a mounting part 7701a, a baffle part 7701c, a connecting cylinder part 7701g, a first guide part 7701d, and a first connecting part 7701f. The structure and connection of the mounting part 7701a, the baffle part 7701c, and the first connecting part 7701f are the same as in Embodiment 1, and will not be described again here. The connecting cylinder portion 7701g is located on one side of the baffle portion 7701c in the M1B direction and is located at the central axis of the main body portion 7701, that is, in the inner periphery of the mounting portion 7701a. The connecting cylinder portion 7701g is hollow inside and has a first guide portion 7701d on its circumferential wall. The first guide portion 7701d is a first spiral groove that extends spirally around the connecting cylinder portion 7701g. There are two first spiral grooves, which are centrally symmetrical. Each first spiral groove is connected to a drive groove 7701h at its M1A end. The drive groove 7701h is a straight groove opened on the circumferential wall of the connecting cylinder portion 7701g and extends along the axial direction M1.

[0204] Referring to Figures 22-24 and 26-27, the idling part 7702 includes an idling base 7702a, an idling force receiving part 7702b, a limiting part 7702c, an idling guide part 7702d, a mating hole 7702e, and a third guide part 7702h. The idling force receiving part 7702b, the limiting part 7702c, the idling guide part 7702d, and the mating hole 7702e are the same as in Embodiment 1, and will not be described again here. In this embodiment, the idling base 7702a is longer in axial length than in Embodiment 1, and is cylindrical with a hollow interior. The third guide part 7702h is a second spiral groove provided on the circumferential wall of the idling base 7702a. The second spiral groove has the same slope as the first spiral groove (first guide part 7701d). Two second spiral grooves are provided, and the two second spiral grooves are centrally symmetrically arranged. Each second spiral groove has an anti-detachment part 7702j at the M1B direction end. The anti-detachment part 7702j is a protrusion used to prevent the component in the second spiral groove from coming out.

[0205] Referring to Figures 22-24 and 28, the drive unit 7703 includes a second connecting post 7703g, a third connecting post 7703h, an abutment baffle 7703j, a second guide 7703c, and a drive rod 7703b. The second connecting post 7703g and the third connecting post 7703h are axially connected to each other. The second connecting post 7703g is located on the M1B direction side of the third connecting post 7703h. The outer diameter of the third connecting post 7703h is larger than the outer diameter of the second connecting post 7703g. The abutment baffle 7703j is provided on the third connecting post 7703h. The abutment baffle 7703j has a ring-shaped protrusion structure and protrudes radially from the circumferential wall of the third connecting post 7703h. The drive rod 7703b is located at the M1A direction end of the third connecting post 7703h, and the structure of the drive rod 7703b is the same as in Embodiment 1. The outer diameter of the second connecting post 7703g is adapted to the inner diameter of the connecting cylinder 7701g, and it can be inserted into the connecting cylinder 7701g. The second guide 7703c is provided on the circumferential wall of the M1B direction end of the second connecting post 7703g. The second guide 7703c is a protruding structure and can enter the drive groove 7701h and the first guide 7701d (first spiral groove) and move within the drive groove 7701h and the first spiral groove.

[0206] The rotating component 7705 has a ring structure and is sleeved on the third connecting post 7703h of the driving part 7703. It can rotate relative to the driving part 7703. During assembly, the rotating component 7705 is sleeved on the third connecting post 7703h and assembled with the driving part 7703 to the main body 7701. The second guide part 7703c is aligned with the driving groove 7701h and then moves along the driving groove 7701h into the first guide part 7701d. When it moves along the first guide part 7701d to the farthest point in the second direction (the first guide part 7701d is located at the M1B direction end of the first spiral groove), the M1B direction end of the rotating component 7705 abuts against the M1A direction end face of the main body 7701, and the M1A direction end of the rotating component 7705 abuts against the abutment baffle 7703j. The rotating part 7705 has a fourth guide part 7705a on its outer circumference. The fourth guide part 7705a is a protruding structure and can enter the third guide part 7702h (second spiral groove) of the idling part 7702 and move within the second spiral groove.

[0207] Referring to Figure 24, the elastic member 7704 is disposed between the idling part 7702 and the driving part 7703. The elastic member 7704 is located inside the idling base 7702a and one end of it abuts against the inner end face of the idling base 7702a in the M1B direction, and the other end abuts against the end face of the abutting baffle 7703j of the driving part 7703 in the M1A direction.

[0208] Referring to Figure 22, in the initial position, the drive part 7703 is located at its furthest point under the action of the elastic member 7704. The top part 77032b of the drive rod 7703b is no longer in the mating hole 7702e. The first guide part 7701d is located at the M1B direction end of the second guide part 7703c. The fourth guide part 7705a is located at the M1B direction end of the third guide part 7702h and abuts against the surface of the third guide part 7702h in the M1B direction. The fourth guide part 7705a can also abut against the anti-detachment part 7702j to prevent the fourth guide part 7705a from detaching from the third guide part 7702h.

[0209] Referring to Figures 22-29, when the drum coupling 770 engages with the driving force transmission member 180, the engagement process of the idle part 7702 is the same as in Embodiment 1. After the idle part 7702 engages with the driving force transmission member 180, the driving force transmission member 180v drives the idle part 7702 to rotate in the rotation direction A. The third guide part 7702h exerts a pushing force on the fourth guide part 7705a. This pushing force has a component force in the M1A direction and a component force in the rotation direction A (due to the pressure of the elastic member 7704 and the friction between the rotating member 7705 and the abutment baffle 7703j, etc., the rotation direction...). The component force of A cannot drive the rotating part 7705 to rotate. The component force along the M1A direction pushes the rotating part 7705 to move in the M1A direction. The rotating part 7705 then pushes the abutting baffle 7703j that it abuts against, causing the driving part 7703 to also move in the M1A direction. The elastic member 7704 is compressed. When the driving part 7703 moves in the M1A direction, due to the guiding effect of the first guide part 7701d on the second guide part 7703c, the driving part 7703 simultaneously generates a rotational motion, that is, the driving part 7703 rotates and moves outward, causing the driving rod 7703b to extend into the mating hole 7702e.

[0210] After the drive rod 7703b extends into the mating hole 7702e, the mating hole 7702e will also push the drive rod 7703b to rotate the drive unit 7703. The second guide part 7703c will continue to rotate and move along the first guide part 7701d in the first direction. Then, the engagement of the drive rod 7703b with the connecting frame 180j is the same as in Embodiment 1. When the rod body 77031b of the drive rod 7703b abuts against the downstream side wall 1801j of the connecting frame 180j, after the drive unit 7703 is driven by the connecting frame 180j alone, the second guide part 7703c will leave the first guide part 7701d and enter the drive groove 7701h, and abut against the downstream inner wall of the drive groove 7701h in the rotation direction A, thereby driving the main body 7701 to rotate, and then driving the photosensitive drum 707 to work. After the driving rod 7703b is pushed by the mating hole 7702e to rotate the driving part 7703, the force of the mating hole 7702e on the driving rod 7703b can counteract the pushing force of the elastic member 7704 on the driving part 7703b in the M1B direction, so that the driving part 7703b keeps its position unchanged in the axial direction. Therefore, the force of the elastic member 7704 in the M1B direction will not act on the rotating part 7705 through the abutment baffle 7703j. The fourth guide part 7705a of the rotating part 7705 will no longer move axially, but will be driven to rotate synchronously by the idle part 7702.

[0211] The other structures in this embodiment are the same as in Embodiment 1, and will not be described again here.

[0212] Example 3

[0213] This embodiment provides another processing box, which differs from the first embodiment in that the structure of the drum coupling is different.

[0214] Referring to Figures 30-35, in this embodiment, the drum coupling 770 includes a main body 7701, an idle part 7702, a drive part 7703, a first elastic element 7706, and a second elastic element 7707.

[0215] Referring to Figures 30-32, the main body 7701 includes a mounting part 7701a, a cylindrical part 7701b, a baffle part 7701c, a mounting groove 7701k, and a drive groove 7701h. The mounting part 7701a is located at one end of the main body 7701 facing the photosensitive drum 707 (i.e., the end in the M1B direction). The mounting part 7701a is used to connect with the photosensitive drum 707, thereby fixing the main body 7701 to one end of the photosensitive drum 707. Specifically, the mounting part 7701a is a cylindrical / cylindrical structure adapted to the photosensitive drum 707. During assembly, the mounting part 7701a is inserted into the photosensitive drum 707 and fastened inside the photosensitive drum 707 by an interference fit. It can also be fixed by snap-fit, adhesive, screw, or other methods. A baffle portion 7701c is provided at one end of the mounting portion 7701a in the M1A direction. The outer diameter of the baffle portion 7701c is larger than the outer diameter of the mounting portion 7701a. When the mounting portion 7701a is inserted into the photosensitive drum 707, the baffle portion 7701c abuts against the end face of the photosensitive drum 707 in the M1B direction, thereby defining the position of the main body portion 7701. A cylindrical portion 7701b is located at the central axis of the main body portion 7701 and extends along the axial direction M1. A drive groove 7701h is provided on the cylindrical portion 7701b. The drive groove 7701h is a strip-shaped groove that extends radially along the cylindrical portion 7701b and penetrates the cylindrical portion 7701b axially. A mounting groove 7701k is provided at one end of the main body portion 7701 in the M1A direction. The mounting groove 7701k is an annular groove provided around the cylindrical portion 7701b.

[0216] Referring to Figures 30-31 and 33-34, the idler portion 7702 is rotatably and movable along the axial direction M1 on the first support member 733R. The first support member 733R is provided with a rotating hole 7331R for supporting the idler portion 7702. The rotating hole 7331R extends along the axial direction M1, and the inner wall of the rotating hole 7331R is provided with a fifth guide portion 7332R. The fifth guide portion 7332R is a guide groove that extends obliquely relative to the axial direction M1, that is, the guide groove extends spirally along the inner wall of the rotating hole 7331R. The M1A direction end of the fifth guide portion 7332R (the end away from the photosensitive drum 707) is located upstream of its M1B direction end (the end closer to the photosensitive drum 707) in the rotation direction. The idler portion 7702 includes an idler base portion 7702a, a limiting portion 7702c, an idler engagement portion 7702m, a mating hole 7702e, and a sixth guide portion 7702n. The idling base 7702a is roughly cylindrical in shape and hollow inside. The outer diameter of the idling base 7702a is adapted to the rotating hole 7331R and can be fitted inside the rotating hole 7331R. The sixth guide portion 7702n is disposed on the outer wall of the idle base 7702a. The sixth guide portion 7702n is a guide rib that extends obliquely relative to the axial direction M1 of the idle base 7702a. That is, the guide rib extends spirally along the outer wall of the idle base 7702a. The M1A direction end of the guide rib (the end away from the photosensitive drum 707) is located on the upstream side of its M1B end (the end close to the photosensitive drum 707) in the rotation direction A. The guide rib is adapted to the guide groove (the fifth guide portion 7332R) (having the same slope). When the idle base 7702a is assembled with the first support member 733R, the idle base 7702a is fitted into the rotating hole 7331R and the sixth guide portion 7702n is embedded into the fifth guide portion 7332R.

[0217] Referring to Figure 33, a limiting part 7702c and an idle engagement part 7702m are provided on the end face of the idle base 7702a in the M1A direction. The limiting part 7702c corresponds to component 770a in Figure 6, and it engages with the positioning boss 180i of the drive force transmission member 180 to position the drive force transmission member 180. The idle engagement part 7702m is a protruding structure extending from the end face of the idle base 7702a in the M1A direction. The idle engagement part 7702m includes an idle force receiving part 7702b, a braking force engagement part 7702p, and an idle guide part 7702d.

[0218] Referring to Figures 33 and 36, the engagement portion of the first braking force engagement member 814 has a triangular groove 814a on the upstream side of the rotation direction A and an inclined surface 814b on the downstream side of the rotation direction A. The idle force receiving portion 7702b (equivalent to 770b in Figure 6) is located upstream of the idle engagement portion 7702m in the rotation direction A and can fit against the drive transmission surface 180d of the drive force transmission portion 180v, thereby receiving the driving force to cause the idle portion 7702 to idle. The braking force engagement portion 7702p (equivalent to 770c in Figure 6) is located downstream of the idle engagement portion 7702m in the rotation direction A. The braking force engagement portion 7702p can engage with the triangular groove 814a of the engagement portion of the first braking force engagement member 814, enabling… To avoid abnormal noise during rotation, the braking force engagement portion 7702p can be triangular, which can fit into the triangular groove 814a of the first braking force engagement member 814. The braking force engagement portion 7702p can also be other shapes, as long as it can extend into the triangular groove 814a. Preferably, the braking force engagement portion 7702p has a first inclined surface 77021p, which is the surface near the photosensitive drum 707. The first inclined surface 77021p gradually extends incline away from the photosensitive drum 707 in the rotation direction A. The idle guide 7702d is equivalent to components 770d and 770g in Figure 6. It is used to guide the first braking force engagement member 814 and the second braking force engagement member 818, so that the braking force engagement member is away from the driving force transmission part 180v, and the idle engagement part 7702m can smoothly enter between the first braking force engagement member 814 and the driving force transmission part 180v and engage with the first braking force engagement member 814 and the driving force transmission part 180v. The idle guide 7702d is the end face of the idle engagement part 7702m facing the M1A direction. The idle guide 7702d is a guide slope, which gradually extends towards the photosensitive drum 707 in the rotation direction A.

[0219] Two idling joints 7702m are provided, and the two idling joints 7702m are arranged symmetrically at the center. Two mating holes 7702e are provided, axially penetrating the end face of the idling base 7702a, and each of the two idling force receiving parts 7702b is provided. In the radial direction, the mating holes 7702e are located inside the idling joints 7702m.

[0220] Referring to Figures 30-31 and 35, the drive unit 7703 includes a rotating part 7703a, a drive rod 7703b, and a drive protrusion 7703k. The rotating part 7703a is a cylindrical component whose outer diameter is adapted to the inner diameter of the idle base 7702a, and can be fitted inside the idle base 7702a and rotate relative to the idle base 7702a. A drive rod 7703b is disposed on the end face of the rotating part 7703a in the M1A direction. The drive rod 7703b extends along the M1A direction and at least part of it can be inserted into the mating hole 7702e of the idling part 7702. The drive rod 7703b has a rod body 77031b and a top end 77032b. The rod body 77031b is a cylindrical rod. Its M1B end is connected to the end face of the rotating part 7703a, and its M1A end is connected to the top end 77032b. The outer diameter of the top end 77031b gradually decreases along the first direction (M1A direction). That is, the outer diameter of the top end 77032b is largest at the end closer to the photosensitive drum 707 and smallest at the end farther away from the photosensitive drum 707. The outer diameter of the M1B direction end of the top end 77032b is equal to the outer diameter of the rod body 77031b. The size of the mating hole 7702e is larger than the outer diameter of the rod portion 77031b (for example, the mating hole 7702e can be an arc-shaped groove / strip groove, etc.), so that the drive rod 7703b has a certain degree of freedom in the rotation direction A within the mating hole 7702e. Optionally, the top end can be hemispherical, frustum-shaped, or other shapes, as long as its outer diameter decreases along the M1A direction. The drive protrusion 7703k is provided on the end face of the rotating part 7703a in the M1A direction. The drive protrusion 7703k is a flat and elongated plate-like member that can be inserted into the drive groove 7701h of the main body 7701 and fit against the drive groove 7701h, so that when the drive part 7703 rotates, it can drive the main body 7701 to rotate through the contact between the drive protrusion 7703k and the drive groove 7701h.

[0221] Referring to Figures 30-31, a first elastic member 7706 is disposed between the main body 7701 and the idling part 7702. The first elastic member 7706 is configured to apply a force to the idling part 7702, causing it to move in the M1A direction, and to keep the idling part 7702 at its furthest point in the first direction (i.e., the position furthest from the photosensitive drum 707, i.e., the initial position) without being subjected to other external forces. Preferably, the first elastic member 7706 is a compression spring, but it can also be a torsion spring or other components. The first elastic member 7706 is fitted inside the mounting groove 7701k, with one end abutting the bottom of the mounting groove 7701k and the other end abutting the M1B direction end face of the idling base 7702a. The first elastic member 7706 is configured to be in a compressed state, thereby continuously applying a force along the M1A direction to the idling part 7702, keeping the idling part 7702 in its initial position.

[0222] Referring to Figures 30-31, a second elastic member 7707 is disposed between the main body 7701 and the drive part 7703. The second elastic member 7707 is preferably a compression spring, which is sleeved on the drive protrusion 7703k, with one end abutting the M1A direction end face of the cylindrical part 7701b and the other end abutting the M1B direction end face of the rotating part 7703a. The second elastic member 7707 is configured to apply a force in the M1A direction to the drive part 7703, so that it remains at the furthest point in the first direction (i.e., the position furthest from the photosensitive drum 707, i.e., the initial position) without being subjected to other external forces.

[0223] When the drum coupling 770 is in its initial position (before engaging with the drive force transmission member 180), the idle part 7702 is at its furthest point in the first direction under the force of the first elastic member 7706, the drive part 7703 is at its furthest point in the first direction under the force of the second elastic member 7707, and the top part 77032b of the drive rod 7703b does not extend into the mating hole 7702e.

[0224] Referring to Figures 1-5 and 30-37, when the drum coupling 770 is in its initial position and moves along the M1A direction (first direction) with the processing box to engage with the driving force transmission member 180, the idle part 7702 first contacts the driving force transmission member 180. At this time, there are two situations: (1) When the idle engagement part 7702m and the driving force transmission part 180v are in close phase in the rotation direction A (i.e., when viewed along the axial direction M1, the idle engagement part 7702m and the driving force transmission part 180v have an overlapping part), the M1A direction end of the idle engagement part 7702m will contact the M1B direction end of the driving force transmission part 180v and then push the driving force transmission member 180 in the M1A direction, and the drum drive coupling spring 820 and the brake engagement spring 821 are compressed. Then, as the driving force transmission component 180 begins to rotate, since the idle joint 7702m remains stationary, the idle joint 7702m enters between the driving force transmission part 180v of the driving force transmission component 180 and the first braking force engagement component 814, and no longer presses against the driving force transmission part 180v. Under the partial rebound force of the drum drive coupling spring 820 and the brake engagement spring 821, the driving force transmission part 180v moves a certain distance in the direction of M1B. (2) When the idler and the driving force transmission part 180v are not in close phase on the circumference (i.e., when viewed along the axial direction M1, the idler engagement part 7702m and the driving force transmission part 180v have no overlapping part), the idler engagement part 7702m will continue to move in the direction of M1A until the limiting part 7702c of the end face of the idler part 7702 completely engages with the positioning boss 180i and abuts against the end face of the connecting frame 180j in the direction of M1B, and then pushes the driving force transmission member 180 in the direction of M1A, and the drum drive coupling spring 820 and the brake engagement spring 821 are compressed.Then, as the driving force transmission component 180 begins to rotate, two situations arise: ① If the driving force transmission part 180v, the idle engagement part 7702m, and the first braking force engagement component 814 are arranged sequentially in the rotation direction A, then the idle engagement part 7702m can directly complete the engagement (the idle force receiving part 7702b is in contact with the driving transmission surface 180d, and the braking force engagement part 7702p is engaged with the triangular groove 814a of the first braking force engagement component 814); ② If the first braking force engagement component 814, the idle engagement part 7702m, and the driving force transmission part 180v are arranged sequentially in the rotation direction A, then as the driving force transmission component 180 rotates, the idle engagement part 7702m will first move along the inclined surface 814b of the first braking force engagement component 814 to the first The end of the braking force engagement member 814 in the M1B direction (during this process, the idle engagement part 7702m pushes the driving force transmission member 180 along the M1A direction, and the drum drive coupling spring 820 and the brake engagement spring 821 are compressed again), and then the idle guide part 7702d is used to push the first braking force engagement member 814 apart in the rotation direction A until the gap between the first braking force engagement member 814 and the driving force transmission part 180v is large enough, and the idle engagement part 7702m enters the gap. At this time, in the rotation direction A, the driving force transmission part 180v, the idle engagement part 7702m, and the first braking force engagement member 814 are arranged in sequence, and the idle engagement part 7702m can complete the engagement, and the drum drive coupling spring 820 and the brake engagement spring 821 partially spring back.

[0225] After the idler 7702 is engaged with the drive force transmission member 180, the drive force transmission member 180v drives the idler 7702 to rotate in the rotation direction A. The sixth guide 7702n on the idler 7702 moves along the fifth guide 7332R, causing the idler to rotate while retracting in the second direction (M1B direction). The first elastic member 7706 is compressed, and the drum drive coupling spring 820 and the brake engagement spring 821 continue to rebound. The drive force transmission member 180v continues to move in the M1B direction. The top end 77032b of the drive rod 7703b abuts against the inner end wall of the idler base 7702a and is also pushed to move in the second direction (M1B direction). The second elastic member 7707 is compressed.

[0226] If the idler 7702 rotates to the position corresponding to the mating hole 7702e and the drive rod 7703b before the retraction of the idler 7702 in the M1B direction is completed, the drive rod 7703b will no longer abut against the idler base 7701a. Instead, it will gradually emerge from the mating hole 7702e as the idler 7702 retracts. The second elastic element 7707 will also deform and recover, causing the drive rod 7703b to extend in the M1A direction. The idler 7702 can push the drive rod 7703b through the mating hole 7702e, causing the drive 7703b to rotate with the idler 7702. After the idling part 7702 has finished retracting, the sixth guide part 7702n leaves the fifth guide part 7332R. The idling part 7702 can rotate relative to the first support member 733R and no longer move axially. The first elastic member 7706 is compressed to the maximum extent. The drum drive coupling spring 820 and the brake engagement spring 821 fully rebound. After the driving force transmission member 180 returns to its initial position, it no longer continues to move in the M1B direction. At this time, the drive rod 7703b can abut against the connecting frame 180j and receive the driving force of the connecting frame 180j, causing the drive part 7703 to rotate. Then, through the abutment relationship between the drive protrusion 7703k and the drive groove 7701h, the main body part 7701 rotates, thereby driving the photosensitive drum 707.

[0227] If the drive rod 7703b has not yet emerged from the mating hole 7702e after the idling part 7702 has finished retracting in the M1B direction, when the mating hole 7702e rotates to the phase where the drive rod 7703b is located (the position corresponding to the mating hole 7702e and the drive rod 7703b), the drive rod 7703b is pushed out by the deformation recovery force of the second elastic member 7707, extends into the drive force transmission member 180, and abuts against the connecting frame 180j to receive the driving force of the connecting frame 180j to rotate the drive part 7703, thereby driving the main body part 7701 to rotate.

[0228] Subsequently, the idler unit 7702 rotates along rotation direction A under the drive of the drive force transmission unit 180v, the drive unit 7703 rotates along rotation direction A under the drive of the connecting frame 180j, and the main body 7701 rotates along rotation direction A under the drive of the drive unit 7703. By engaging the idler unit 7702 with the braking force engagement member, the abnormal noise problem is solved, and the drive rod 7703b of the drive unit 7703 receives the driving force from the connecting frame 180j, thus driving the photosensitive drum 707. The separation of braking and driving engagements allows for diverse shapes and structures in the drum coupling 770, facilitating future upgrades.

[0229] When the processing box is removed, the first elastic element 7706 returns to its original shape, pushing the idler 7702 to rotate and move along the M1A direction to the furthest point (away from the photosensitive drum 707). The drive rod 7703b is hidden inside the idler 7702, and the drum coupling 770 returns to its initial position.

[0230] Example 4

[0231] This embodiment provides another processing box, which differs from Embodiment 3 in that the structure of the drum coupling is different.

[0232] Referring to Figures 38-40, in this embodiment, the drum coupling 770 includes a main body 7701, an idle part 7702, a drive part 7703, a first elastic element 7706, and a second elastic element 7707.

[0233] Referring to Figures 40-41, the main body 7701 includes a mounting portion 7701a, a cylindrical portion 7701b, a baffle portion 7701c, a first driving protrusion 7701e, a receiving portion 7701m, and a vacant slot 7701n. The structure and connection of the mounting portion 7701a and the baffle portion 7701c are the same as in Embodiment 3, and will not be described again here. The cylindrical portion 7701b is disposed on one side of the baffle portion 7701c in the M1A direction. The cylindrical portion 7701b extends in a direction away from the photosensitive drum 707 (M1A direction, first direction). The interior of the cylindrical portion 7701b is hollow, and a portion of the cylindrical portion 7701b is supported within the rotating hole 7331R of the first support member 733R. The first driving protrusion 7701e is a protrusion structure provided on the inner wall of the cylindrical portion 7701b. The first driving protrusion 7701e protrudes radially from the cylindrical portion 7701b, and the side of the first driving protrusion 7701e on the upstream side in the rotation direction A is a driving force receiving surface 77011e. Two first driving protrusions 7701e are provided, and the two first driving protrusions 7701e are arranged centrally symmetrically. The receiving portion 7701m is provided inside the cylindrical portion 7701b and is located at the central axis of the main body portion 7701. The receiving portion 7701m is a hollow cylindrical member used to receive the second elastic member 7707. There is a radial gap between the outer wall of the receiving portion 7701m and the inner wall of the first driving protrusion 7701e. The idle slot 7701n is an arc-shaped groove formed between the two first driving protrusions 7701e inside the cylindrical part 7701b and the outer wall of the receiving part 7701m. The extension direction of the arc-shaped groove is along the rotation direction A. There are also two idle slots 7701n, and the two idle slots 7701n are arranged in a centrally symmetrical manner.

[0234] Referring to Figures 38-40 and 42-43, the idler part 7702 is rotatably disposed in the rotating hole 7331R of the first support member 733R. The idler part 7702 includes an idler base 7702a, an idler engagement part 7702m, a mating hole 7702e, and a force-bearing part 7702q. In this embodiment, the idling base 7702a is axially shortened compared to Embodiment 3. The idling base 7702a is disc-shaped. The first support member 733R is provided with a locking structure 7333R. The locking structure 7333R includes a plurality of elastic buckles arranged at intervals around the rotating hole 7331R. The hooks of the elastic buckles extend out of the M1A direction end face of the rotating hole 7331R. When the idling part 7702 is assembled in the rotating hole 7331R, the hooks of the elastic buckles abut against the M1A direction end face of the idling base 7702a, thereby preventing the idling part 7702 from disengaging from the rotating hole 7331R. A mating hole 7702e is provided through the central axis of the idling base 7702a. An idling engagement portion 7702m is provided on the M1A direction end face of the idling base 7702a, and is located around the mating hole 7702e. The radial radius of the idling engagement portion 7702m is close to that of the driving force transmission portion 180v and the first braking force engagement member 814. The structure of the idling engagement portion 7702m is the same as in Embodiment 3, and will not be described again here. A force-receiving portion 7702q is a protrusion provided on the M1A direction end face of the idling base 7702a. The force-receiving portion 7702q is used to cooperate with the first elastic member 7706 to receive the force of the first elastic member 7706. Multiple force-receiving portions 7702q can be provided, arranged circumferentially at intervals on the M1A direction end face of the idling base 7702a.

[0235] Referring to Figures 38-40 and 44-47, the drive unit 7703 includes a rotating part 7703a, a drive rod 7703b, a second drive protrusion 7703d, a connecting part 7703m, and a reset groove 7703n. The rotating part 7703a is generally disc-shaped. The outer diameter of the rotating part 7703a is larger than the outer diameter of the receiving part 7701m of the main body 7701, and also larger than the inner diameter of the mating hole 7702e of the idle part 7702. The connecting part 7703m is an annular component, located at the central axis position of the end face in the M1B direction of the rotating part 7703a. The inner diameter of the connecting part 7703m is adapted to the inner diameter of the receiving part 7701m. During assembly, the connecting part... Part 7703m is inserted into receiving part 7701m so that driving part 7703 is rotatably supported in receiving part 7701m, and the M1B direction end of rotating part 7703a abuts against the M1A direction end face of receiving part 7701m, and the M1A direction end of rotating part 7703a abuts against the M1B direction end face of idle base 7702a, that is, rotating part 7703a is sandwiched between receiving part 7701m and idle part. The drive rod 7703b is located at the M1A direction end of the rotating part 7703a. The M1A direction end of the drive rod 7703b is provided with a sliding inclined surface 77033b. There are two drive rods 7703b, which are centrally symmetrically arranged. Both drive rods 7703b extend from the mating hole 7702e of the idling part 7702. The radial position of the drive rod 7703b is close to the radius of the second braking force engaging member 818. The second drive protrusion 7703d is provided on the circumferential wall of the rotating part 7703a. The second drive protrusion 7703d protrudes radially, and there are two second drive protrusions 7703d. The two second drive protrusions 7703d are arranged in a centrally symmetrical manner. When the driving part 7703 is assembled on the main body part 7701, the second drive protrusion 7703d is located in the idle groove 7701n. The reset groove 7703n is an arc-shaped groove that passes through the rotating part 7703a.

[0236] Referring to Figures 46-47, the second elastic element 7707 is disposed within the receiving portion 7701m. The second elastic element 7707 is preferably a torsion spring, with its coil portion housed within the receiving portion 7701m, and one arm abutting against the receiving portion 7701m. An abutting groove or abutting block may be provided on the receiving portion 7701m to abut against the second elastic element 7707. The other arm of the second elastic element 7707 extends into the reset groove 7703n and abuts against the rotating portion 7703a. The force exerted by the second elastic element 7707 on the driving portion 7703 causes it to be in the initial position (where the second driving protrusion 7703d is located within the idle groove 7701n away from the driving force receiving surface 77011e of the first driving protrusion 7701e) without any other external force. That is, the direction of the force exerted by the second elastic element 7707 is opposite to the rotation direction A.

[0237] Referring to Figure 39, the first elastic element 7706 is disposed on the first support member 733R. The first support member 733R is provided with a connecting post 7334R and an abutting protrusion 7335R. The first elastic element 7706 is preferably a torsion spring, with its coil portion sleeved on the connecting post 7334R. One arm abuts against the abutting protrusion 7335R, and the other arm abuts against the force-receiving portion 7702q of the idling part 7702. The direction of the force exerted by the first elastic element 7706 on the idling part 7702 is opposite to the rotation direction A.

[0238] Referring to Figures 39-48, when the drum coupling 770 moves along the M1A direction (first direction) with the processing box and engages with the driving force transmission member 180, according to the positional relationship of the idle engagement part 7702m, the drive rod 7703b, the driving force transmission part 180v, and the braking force engagement members (first braking force engagement member 814 and second braking force engagement member 818) in the rotation direction A, the following four situations may exist: (1) In the rotation direction A, the drive rod 7703b and the idle engagement part 7702m, the drive rod 7703b, the driving force transmission part 180v, and the braking force engagement members (first braking force engagement member 814 and second braking force engagement member 818) are in the rotation direction A. The joint 7702m is located between the drive force transmission part 180v and the braking force engagement member (specifically between the drive transmission surface 180d and the triangular groove 814a). At this time, it is in a position where it can directly complete the engagement. When the rotation starts, the idle force receiving part 7702b of the idle joint 7702m is in contact with the drive transmission surface 180d, the braking force joint 7702p is engaged with the triangular groove 814a of the first braking force engagement member 814, and the drive rod 7703b is in contact with the connecting frame 180j. The idle joint 7702m is driven to rotate by the driving force transmission part 180v. The driving rod 7703b is pushed by the connecting frame 180j to make the driving part 7703 rotate. Due to the second elastic element 7707, the driving part 7703 is in the initial position where the second driving protrusion 7703d is away from the driving force receiving surface 77011e of the first driving protrusion 7701e. At this time, the driving part 7703 rotates, and the second driving protrusion 7703d begins to rotate in the idle groove 7701n in the direction of gradually approaching the driving force receiving surface 77011e of the first driving protrusion 7701e and compressing the second elastic element 7707. However, it has not yet driven the main body 7701. Only when the driving part 7703 rotates to the point where the second driving protrusion 7703d contacts the driving force receiving surface 77011e of the first driving protrusion 7701e will it start to drive the main body 7701 to rotate.(2) The drive rod 7703b is located between the drive force transmission part 180v and the braking force engagement member, and the idle engagement part 7702m is located on the outer side (the first braking force engagement member 814 is on the downstream side of the rotation direction A). When the drive force transmission member 180 starts to rotate, the connecting frame 180j will push the drive rod 7703b to rotate the drive part 7703. Since the drive part 7703 is in the initial position, when the drive rod 7703b drives the drive part 7703 to rotate at this time, the second drive protrusion 7703d begins to idle. The rotating groove 7701n rotates inward toward the driving force receiving surface 77011e of the first driving protrusion 7701e, but does not drive the main body 7701. As the driving force transmission member 180 continues to rotate, the driving force transmission member 180v pushes the first braking force engaging member 814 to rotate. The first braking force engaging member 814 pushes the idle engagement part 7702m located downstream of it. The idle engagement part 7702m is subjected to a force opposite to the rotation direction A by the first elastic member 7706 and does not rotate with the first braking force engaging member. Instead of rotating, the first braking engagement member 814 moves along the inclined surface 814b to the M1B end of the first braking engagement member 814 (during this process, the idle engagement part 7702m pushes the first braking engagement member 814 along the M1A direction, and the brake engagement spring 821 is compressed). After the first braking engagement member 814 is pressed down, the idle engagement part 7702m will pass over the first braking engagement member 814 and pass through the idle guide part 7702d (guide inclined surface) to make the first braking engagement member 814 rotate. 4. When the idle joint 7702m moves away from the drive transmission surface 180d, it reaches between the drive force transmission part 180v and the first braking force engagement member 814. The brake engagement spring 821 rebounds, the first braking force engagement member 814 resets, and the idle joint 7702m completes engagement with the drive force transmission part 180v and the first braking force engagement member 814. The second drive protrusion 7703d rotates to contact the drive force receiving surface 77011e of the first drive protrusion 7701e, and the drive part 7703 begins to drive the main body part 7701. (3) The idle joint 7702m is located between the driving force transmission part 180v and the braking force engagement member, and the driving rod 7703b is located on the outside (the braking force engagement member is on the downstream side of the rotation direction A). When the driving force transmission member 180 starts to rotate, the driving force transmission part 180v pushes the idle joint 7702m and the braking force engagement member to move towards the driving rod 7703b. The sliding inclined surface 77033b of the driving rod 7703b contacts the inclined surface 814b of the second braking force engagement member 818 and pushes the second braking force engagement member 818 to move in the M1A direction. After the driving rod 7703b passes the second braking force engagement member 818, it reaches the position of contacting the connecting frame 180j and is driven to rotate by the connecting frame 180j, thereby driving the main body 7701 to rotate.(4) Neither the drive rod 7703b nor the idle engagement part 7702m is located between the drive force transmission part 180v and the braking force engagement member (both are located downstream of the braking force engagement member in the rotation direction A). When the drive force transmission member 180 starts to rotate, the drive force transmission part 180v pushes the braking force engagement member toward the idle engagement part 7702m and the drive rod 7703b. After contact, the drive rod 7703b presses down and passes over the second braking force engagement member 818, and the idle engagement part 7702m presses down and passes over the first braking force engagement member 814. The idle guide part 7702d (guide slope) of the idle engagement part 7702m pushes away the first braking force engagement member 814, so that the drive rod 7703b and the idle engagement part 7702m are both located between the drive force transmission part 180v and the braking force engagement member, and the two are engaged. After that, the drive rod 7703b rotates to drive the main body part 7701 to rotate.

[0239] When the processing box finishes its work and is removed, the deformation of the second elastic element 7707 recovers, causing the drive unit 7703 to reset to its initial position.

[0240] The other structures in this embodiment are the same as in Embodiment 3, and will not be described again here.

[0241] Example 5

[0242] Referring to Figures 1-6, the drive transmission unit 811, mounted on the main assembly of the image forming apparatus, includes a drive force transmission assembly and a braking force application assembly. The drive force transmission assembly includes a drive gear 813 and a drive force transmission member 180. The braking force application assembly includes a first braking force engagement member 814 and a second braking force engagement member 818. A drum coupling 770 is provided on the processing box. The drum coupling 770 has a drive force receiving portion 770b and a braking force receiving portion 770c. The drive force receiving portion 770b engages with the drive force transmission member 180 to receive drive force, and the braking force receiving portion 770c engages with the first braking force engagement member 814 and the second braking force engagement member 818 to receive braking force.

[0243] In the above-mentioned scheme, the drum coupling 770 has a complex structure. The drive transmission unit 811 and the drum coupling 770 need to be engaged multiple times or run for a long time before they can be effectively matched. This can easily lead to unstable connection and unsmooth power transmission. In addition, it can easily cause the drum coupling 143 to deform and fail to engage.

[0244] To address the aforementioned issues, this embodiment provides a processing box, which differs from the previous embodiments in that the structure of the drum coupling is different.

[0245] Referring to Figure 50, in this embodiment, the drum coupling 770 includes a mounting portion 7701a, a cylindrical portion 7701b, a limiting portion 7702c, and a connecting portion. The mounting portion 7701a is disposed on the side of the drum coupling 770 facing the photosensitive drum 707 (i.e., the side in the M1B direction). The mounting portion 7701a is used to connect with the photosensitive drum 707, thereby fixing the drum coupling 770 to one end of the photosensitive drum 707. Specifically, the mounting portion 7701a is a cylindrical / cylindrical structure adapted to the photosensitive drum 707. During assembly, the mounting portion 7701a is inserted into the photosensitive drum 707 and can be fixed by means of snap-fit, adhesive, screwing, etc.

[0246] Referring to Figure 50, the cylindrical portion 7701b is disposed on the M1A direction side of the mounting portion 7701a, that is, extending in a direction away from the photosensitive drum 707. The surface of the cylindrical portion 7701b along the M1A direction is the first end face 77013b. An annular groove 77014b recessed along the M1B direction is formed on the first end face 77013b. A limiting portion 7702c is disposed in the annular groove 77014b. The limiting portion 7702c is a first annular protrusion disposed at the central axis position of the annular groove 77014b. The first annular protrusion protrudes from the bottom of the annular groove 77014b in the M1A direction and extends beyond the first end face 77013b. The inner diameter of the first annular protrusion is adapted to the positioning protrusion 180i of the driving force transmission member 180. When the driving force transmission member 180 extends along the M1B direction and engages with the drum coupling 770, a part of the positioning protrusion 180i extends into the limiting part 7702c and fits against the limiting part 7702c, which can play a positioning role for the driving force transmission member 180.

[0247] Referring to Figures 50-53, the engagement portion is disposed on the first end face 77013b of the cylindrical portion 7701b. The engagement portion includes at least one protrusion 7704a, which is used to engage with the drive force transmission member 180 to receive the drive force that rotates the drum coupling 770. Specifically, the protrusion 7704a has a first end and a second end. The second end is further away from the photosensitive drum 707 than the first end. The first end (M1B direction end) of the protrusion 7704a is fixedly connected to the first end face 77013b. The second end protrudes in the M1A direction and is a sharp end, that is, the protrusion 7704a is a conical structure. Along the direction from the first end to the second end (i.e., the M1A direction), the radial width of the protrusion 7704a gradually decreases, thereby forming a sharp structure at the second end. Preferably, the protrusion 7704a is a conical structure, or it can be a multi-faceted pyramidal structure. That is, the protrusion 7704a has at least one inclined surface, which is inclined relative to the axial direction (M1 direction) of the photosensitive drum 707. The protrusion 7704a is used to engage with the second end face 180e of the driving force transmission member 180. The second end face 180e is the end face of the cylindrical portion 180c facing the photosensitive drum 707 in the direction of M1B. When engaged, when the drum coupling 770 moves relative to the driving force transmission member 180 in the direction of M1A, the second end of the protrusion 7704a contacts the second end face 180e. As the drum coupling 770 goes deeper, its second end (sharp end) pierces into the second end face 180e and engages with it (that is, the second end of the protrusion 7704a pierces a hole in the second end face 180e and the second end is at least partially embedded in the hole to form a synchronously rotating engagement relationship). This allows it to receive the driving force rotation of the driving force transmission member 180, thereby driving the photosensitive drum 707 to rotate.

[0248] Referring to Figure 50, the number of protrusions 7704a is preferably multiple. In this embodiment, four are used. The multiple protrusions 7704a are distributed at intervals on the first end face 77013b along the rotation direction of the drum coupling 770.

[0249] The protrusion 7704a can be made of a hard material, such as steel, iron, aluminum or various alloy materials, so that the protrusion 7704a has high strength and rigidity and can penetrate into the second end face 180e of the driving force receiving member 180.

[0250] Referring to Figures 54-55, the drum coupling 770 further includes a protective portion 7704b, disposed at the M1A direction end of the cylindrical portion 7701b. The protective portion 7704b covers (surrounds) the outer circumferential surface or the first end face 77013b of the M1A end of the cylindrical portion 7701b, and encloses the joint portion inside it, thereby providing protection and preventing the sharp ends of the joint portion from piercing / scratching the user. The protective portion 7704b is a second annular protrusion. One end of the protective portion 7704b is connected to the cylindrical portion 7701b, and the other end extends in a direction away from the photosensitive drum 707. The M1A direction end of the protective portion 7704b is further away from the photosensitive drum 707 than the M1A direction end of the limiting portion 7702c. Along the direction away from the photosensitive drum (M1A direction), the inner diameter of the protective portion 7704b gradually increases. When the drum coupling 770 moves along the M1A direction to engage with the drive force transmission member 180, the M1A direction end of the cylindrical portion 180c extends into the protective portion 7704b and fits against the protective portion 7704b. That is, the protective portion 7704b covers a part of the drive force transmission member 180, which can restrict the drive force transmission member 180 and prevent the drive force transmission member 180 and the drum coupling 340 from tilting and causing printing defects. At the same time, there is friction between the drive force transmission member 180 and the protective portion 7704b, and as the drum coupling 770 moves, the friction between it and the protective portion 7704b gradually increases, so that the drum coupling 770 and the photosensitive drum 707 can rotate smoothly.

[0251] In this embodiment, the drum coupling receives driving force by engaging the end face of the driving force transmission member 180 with the engagement portion (protrusion 7704a). This eliminates the need for engagement with components such as the driving force transmission member 180v, the first braking force engagement member 814, and the second braking force engagement member 818, thus simplifying the cumbersome engagement process while still enabling driving.

[0252] Example 6

[0253] This embodiment provides another processing box, which differs from Embodiment 5 in that the structure of the joint is different.

[0254] Referring to Figure 56, in this embodiment, the joint is an annular protrusion 7706a. The annular protrusion 7706a is arranged around the first end face 77013b of the drum coupling 770. The annular protrusion 7706a has a first end and a second end. The first end is fixedly connected to the first end face 77013b, and the second end protrudes along the M1A direction. Along the direction from the first end to the second end (i.e., the M1A direction), the radial width of the annular protrusion 7706a gradually decreases, thereby forming a sharp structure at the second end. That is, the radial cross-section of the annular protrusion 7706a is conical.

[0255] Referring to Figures 56-57, when the driving force transmission member 180 moves relative to the drum coupling 770 along the M1B direction, the second end of the annular protrusion 7706a contacts the second end face 180e, and as the driving force transmission member 180 moves, its second end (sharp end) inserts into the second end face 180e and engages with it (that is, the second end of the annular protrusion 7706a pierces the annular groove on the second end face 180e and the second end is at least partially embedded in the annular groove to form a synchronously rotating engagement relationship), thereby receiving the driving force rotation of the driving force transmission member 180, thereby driving the photosensitive drum 707 to rotate.

[0256] The annular protrusion 7706a can be made of a hard material, such as steel, iron, aluminum or various alloy materials, so that the protrusion 7706a has high strength and rigidity and can penetrate into the second end face 180e of the driving force receiving member 180.

[0257] Alternatively, the annular protrusion 7706a can be non-circular, but divided into multiple intermittent annular protrusions 7706a.

[0258] The other structures of the processing box in this embodiment are the same as those in Embodiment 5, and will not be described again here.

[0259] Example 7

[0260] Referring to Figures 1-6, a type of existing drive transmission unit 811 engages with a drum coupling 770 on a processing box via multiple components to drive and brake it. Most existing drum couplings 770 adapted to this type of drive transmission unit 811 are integrally molded parts, relying solely on their own structure to guide the multiple components of the drive transmission unit 811 to engage with their predetermined locations. This type of drum coupling 770 requires multiple guide surfaces (770d, 770g, etc.), and indirectly achieves alignment and engagement by guiding the translation and rotation of different components on the drive transmission unit 811, making the guiding process relatively complex. During the operation of the cartridge, the drive force needs to be transmitted in conjunction with different components on the drive transmission unit 811. Therefore, the connection is prone to instability during the power transmission process. The two need to be engaged multiple times or run for a long time before they can be effectively matched. This will cause the drum coupling 770 to wear and deform, and make it difficult to engage. In particular, when the first braking force engaging component 814 and the second braking force engaging component 818 and the braking force receiving part 770c of the drum coupling 770 are difficult to engage, it will cause the brake transmission component 817 to move axially. This movement will be transmitted to the photosensitive drum 707, which will eventually cause the photosensitive drum 707 to move axially from time to time, affecting the printing quality. Furthermore, improper engagement and movement will also cause abnormal noise.

[0261] To solve the above problems, referring to Figure 58, this embodiment provides a processing box, which differs from Embodiment 5 in that the structure of the drum coupling is different.

[0262] Referring to Figures 58-59, in this embodiment, the drum coupling 770 includes a mounting portion 7701a, a cylindrical portion 7701b, a limiting portion 7702c, and a connecting portion. The structure of the mounting portion 7701a is the same as in Embodiment 5. The first end face 77013b of the cylindrical portion 7701b does not have an annular groove 77014b. The limiting portion 7702c is directly disposed at the central axis position of the first end face 77013b. A plurality of convex ribs 77016b are provided on the circumferential surface of one end of the cylindrical portion 7701b in the M1A direction. The convex ribs 77016b extend radially and axially. Providing convex ribs 77016b can increase the wall thickness (radial thickness) of the M1A direction end of the cylindrical portion 7701b, thereby increasing the strength of the drum coupling 770.

[0263] Referring to Figures 59-63, the joint is a third annular protrusion 7707a disposed on the first end face 77013b. The third annular protrusion 7707a protrudes along the M1A direction, and the joint can be fixed to the first end face 77013b by means of snapping, gluing, etc. The diameter of the third annular protrusion 7707a is smaller than the diameter of the cylindrical part 7701b, that is, there is a certain distance between the outer circumferential surface of the third annular protrusion 7707a and the outer circumferential surface of the cylindrical part 7701b. The joint includes a notch 7707d, a pressing part 7707b, and a driving force receiving part 7707c. There are two notches 7707d, which are centrally symmetrically disposed on the third annular protrusion 7707a. The notch 7707d is a roughly rectangular notch that penetrates the inner and outer walls of the third annular protrusion 7707a, and extends at one end (the M1A direction end) to the M1A direction end face of the third annular protrusion 7707a. The notch 7707d has a driving force receiving portion 7707c on one side in the circumferential direction. The width of the notch 7707d in the circumferential direction is adapted to the width of the connecting frame 180j of the driving force transmission member 180. The pressing portion 7707b is the end face of the third annular protrusion 7707a in the M1A direction (i.e., the end face of the end away from the photosensitive drum 707 in the axial direction). The height of the pressing portion 7707b is higher than the height of the limiting portion, that is, the pressing portion 7707b is further away from the photosensitive drum 707 than the limiting portion. When the drum coupling 770 is engaged with the driving force transmission member 180, the pressing portion 7707b can press the driving force transmission member 180 to move it away from the processing box in the axial M1 direction (moving in the M1A direction), and the drive gear 813 disengages from the second machine baffle 823. When the driving force transmission member 180 moves to its limit position, that is, when the driving force transmission member 180 can no longer move along the M1A direction, the first braking force engagement member 814 and the second braking force engagement member 818 can rotate freely; however, the braking transmission member 817 is axially fixed (the braking force transmission member 817 abuts against the support column 812 and is directly or indirectly pressed along the M1A direction by the driving force transmission member 180), and it cannot move along the M1A / M1B direction.

[0264] Referring to Figures 5 and 60-64, in this embodiment, the third annular protrusion 7707a has a small radial thickness, which is adapted to the gap 819 between the first braking force engagement member 814 and the second braking force engagement member 818. That is, when the drum coupling 770 moves relative to the driving force transmission member 180 in the M1A direction to engage with the driving force transmission member 180, the third annular protrusion 7707a is inserted from the gap 819 between the first braking force engagement member 814 and the second braking force engagement member 818.

[0265] During this engagement process, two scenarios exist. In the first scenario, after the third annular protrusion 7707a is inserted from the gap 819, the pressing part 7707b abuts against the surface of the connecting frame 180j of the driving force transmission member 180 in the M1B direction. As the drum coupling 770 moves along the M1A direction, the pressing part 7707b presses against the connecting frame 180j, causing the entire driving force transmission member 180 to move away from the processing box (moving along the M1A direction). It should be noted that, to ensure the drum coupling 770 and the driving force transmission member...

[0266] In the first case, engagement of 180 will not cause jamming. Now, an elastic member 7071 is provided on the non-drive side (M1B direction side) of the processing box for limiting. Referring to Figure 64, the elastic member 7071 is disposed between the non-drive end of the photosensitive drum 707 and the second support member 733L. The non-drive end of the photosensitive drum 707 is provided with a non-drive bearing 7073. The non-drive bearing 7073 has a recessed receiving groove 7072. The elastic member 7071 is accommodated in the receiving groove 7072, with one end abutting the bottom of the receiving groove 7072 and the other end abutting the second support member 733L. The elastic extension and contraction direction of the elastic member 7071 is along the M1 direction. When the driving force transmission component 180 moves to its limit position, it can no longer move along the M1A direction. At this time, the elastic element 7071 between the photosensitive drum 707 and the second support component 733L is compressed and avoids jamming, so that the drum coupling 770 and the driving force transmission component 180 will not get stuck. Subsequently, the driving force transmission member 180 rotates to the position corresponding to the notch 7707d and the connecting frame 180j (i.e., the pressing part 7707b disengages from the connecting frame 180j), and the elastic element 7071 between the photosensitive drum 707 and the second support member 733L deforms back to its initial state. At this time, the notch 7707d engages with the connecting frame 180j, the end face of the notch 7707d in the M1B direction abuts against the end face of the connecting frame 180j in the M1A direction, and the driving force receiving part 7707c on the notch 7707d abuts against one end face of the connecting frame 180j in the circumferential direction, thereby completing the engagement of the drum coupling 770 and the driving force transmission member 180, and the driving force is transmitted to the drum coupling 770 through the connecting frame 180j. Furthermore, during the subsequent development process, since there is no axially movable gap between the first braking force receiving component 814, the second braking force receiving component 818, the braking transmission component 817, and the driving force transmission component 180 (this state is called the fully depressed state), the braking transmission component 817 will not experience axial movement, will not produce abnormal noise, and will not cause axial movement of the photosensitive drum 707. It should be noted that the elastic element 7071 is initially set to a compressed state, and the force of the elastic element 7071 is greater than the reaction force of the depressed driving force transmission component 180, thereby ensuring that when the drum coupling 770 is engaged with the driving force transmission component 180, the driving force transmission component 180 always remains in a fully depressed state.

[0267] In the second scenario, when the third annular protrusion 7707a is inserted into the gap 819, the notch 7707d is positioned corresponding to the connecting frame 180j, and the notch 7707d directly engages with the connecting frame 180j. At this time, the pressing part 7707b abuts against the first braking force engaging member 814 or the second braking force engaging member 818. As the drum coupling 440 moves along the M1A direction, the pressing part 7707b presses the first braking force engaging member 814 or the second braking force engaging member 818 to move the entire driving force transmission member 180 in the M1A direction. That is, pressing the driving force transmission member 180 to move it along the M1A direction and engaging the driving force receiving part 7707c with the connecting frame 180j are performed simultaneously.

[0268] In this embodiment, the joint (third annular protrusion 7707a) can be made of hard material, such as steel, iron, aluminum or various alloy materials, so that the third annular protrusion 7707a has high strength and rigidity and is not easily damaged.

[0269] The drum coupling 770 in this embodiment has a simple structure and does not need to be connected with components such as the driving force transmission part 180v, the first braking force engagement component 814, and the second braking force engagement component 818. This eliminates the cumbersome engagement process, allows for fast engagement, and does not produce any abnormal noise.

[0270] Example 8

[0271] This embodiment provides another processing box, which differs from the previous embodiment in that the structure of the drum coupling is different.

[0272] In this embodiment, the drum coupling 770 includes a mounting portion 7701a, a cylindrical portion 7701b, a limiting portion 7702c, a connecting portion, and a pressing portion. The structures of the mounting portion 7701a, the cylindrical portion 7701b, and the limiting portion 7702c are the same as in Embodiment 5.

[0273] Referring to Figure 65, in this embodiment, the pressing part is the end face (i.e., the first end face 77013b) of the cylindrical part 7701b away from the photosensitive drum 707. After an annular groove 77014b recessed in the M1B direction is formed on the first end face 77013b, only the outer ring of the circumference remains, that is, the pressing part (first end face 77013b) is an annular surface.

[0274] Referring to Figures 65-67, the joint is a fourth annular protrusion 7708, which is disposed within the annular groove 77014b. The fourth annular protrusion 7708 protrudes from the bottom of the annular groove 77014b in the M1A direction and extends beyond the first end face 77013b, meaning that the M1A direction end of the joint is further away from the photosensitive drum 707 than the pressing part. The joint is located on the periphery of the limiting part, and the M1A direction end of the limiting part is further away from the photosensitive drum 707 than the M1A direction end of the joint. The radial thickness of the fourth annular protrusion 7708 is thicker than that of the third annular protrusion 7707a in Embodiment 7, and its position is further away from the central axis than that of the third annular protrusion 7707a. When the joint engages with the driving force transmission member 180, the joint (fourth annular protrusion 7708) will not be inserted into the gap 819 between the first braking force engaging member 814 and the second braking force engaging member 818.

[0275] Referring to Figures 65-67, the joint is provided with a notch 7708a and a driving force receiving part 7708c. The notch 7708a penetrates the inner and outer walls of the fourth annular protrusion 7708, and extends at one end (M1A direction end) in the axial direction to the M1A direction end face of the fourth annular protrusion 7708. The circumferential width of the notch 7708a is adapted to the width of the driving force transmission part 180v (protrusion structure). The notch 7708a has a straight side in the circumferential direction and an inclined side in the other direction. The inclined side is the driving force receiving part 7708c. The driving force receiving part 7708c is inclined relative to the axial direction M1 and has an inclination that matches the driving transmission inclined surface 180f. When the joint is engaged with the driving force transmission member 180, the notch 7708a engages with the driving force transmission part 180v, and the driving force receiving part 7708c (inclined surface) abuts against the driving transmission inclined surface 180f to receive the driving force.

[0276] Referring to Figure 65, at least two notches 7708a are provided (the same number as the driving force transmission part 180v), and the two notches 7708a are centrally symmetrical about the axial direction M1. The two centrally symmetrical notches 7708a form a group. Preferably, two groups of notches 7708a (a total of four notches 7708a) are provided on the joint. The two groups of notches 7708a are alternately arranged in the circumferential direction of the joint. Specifically, the first notch, the second notch, the third notch and the fourth notch are arranged sequentially in the circumferential direction, wherein the first notch and the third notch are a centrally symmetrical group, and the second notch and the fourth notch are a centrally symmetrical group. When the drum coupling 770 is engaged with the driving force transmission member 180, the two driving force transmission parts 180v engage with one of the groups of notches to realize the driving force transmission. Providing two groups of notches can increase the engagement probability and shorten the engagement time.

[0277] Referring to Figures 65-67, when the drum coupling 770 moves relative to the driving force transmission member 180 along the M1A direction to engage with the driving force transmission member 180, there are two situations. In the first situation, the position of one set of notches 7708a on the engagement portion directly corresponds to the driving force transmission member 180v, and the other set of notches 7708a corresponds to the engagement portion of the first braking force engagement member 814 (i.e., the claw portion extending out of the driving force transmission member 180). In this case, direct engagement is possible. As the drum coupling 770 moves along the M1A direction, one set of notches 7708a engages with the driving force transmission member 180v, and the driving force receiving portion 7708c on it abuts against the driving transmission inclined surface 180f. The other set of notches 7708a then covers the engagement portion of the first braking force engagement member 814. As the drum coupling 770 moves further along the M1A direction, the pressing part contacts the second end face 180e of the driving force transmission member 180 and pushes the driving force transmission member 180 to move along the M1A direction. The first braking force receiving member 814, the second braking force receiving member 818, and the braking transmission member 817 move together along the M1A direction with the driving force transmission member 180. The braking transmission member 817 contacts the support shaft 812, and the braking engagement spring 821 is compressed. At this point, the drum coupling 770 and the driving force transmission member 180 are engaged and can receive driving force to rotate. In the subsequent development process, since there is no movable gap in the axial direction between the first braking force receiving member 814, the second braking force receiving member 818, the braking transmission member 817 and the driving force transmission member 180, the braking transmission frame 817 will not produce axial movement, will not produce abnormal noise, and will not cause the photosensitive drum 707 to move axially.

[0278] In the second scenario, during engagement, the engagement portion of the first braking force engagement member 814 is close to or abuts the driving force transmission part 180v. The two sets of notches 7708a are not aligned with the driving force transmission part 180v or the engagement portion of the first braking force engagement member 814. In this case, direct engagement is not possible. The driving force transmission member 180 will first rotate a certain angle, causing one set of notches 7708a to engage with the engagement portion of the first braking force engagement member 814. As the driving force transmission member 180 continues to rotate, the first braking force engagement member 814 will be stuck by the notches 7708a, i.e., the driving force transmission member 1... 80 rotates relative to the first braking force engaging member 814. The first braking force engaging member 814 gradually moves away from the driving force transmission part 180v until the distance between the two is sufficient for the engaging part to engage. At this time, the position of another set of notches 7708a corresponds to the driving force transmission part 180v. The drum coupling 770 can continue to move along the M1A direction so that the other set of notches 7708a engages with the driving force transmission part 180v. The driving force receiving part 7708c on it abuts against the driving transmission inclined surface 180f. The subsequent process of pressing the driving force transmission member 180 moving along the M1A direction is the same as the first case.

[0279] The drum coupling 770 in this embodiment has a simple structure, engages with the drive transmission component 180 quickly, and does not produce abnormal noise.

[0280] Example 9

[0281] This embodiment provides another processing box, which differs from Embodiment 8 in that the structure of the drum coupling is different.

[0282] Referring to Figures 68-69, in this embodiment, the drum coupling 770 includes a mounting portion 7701a, a cylindrical portion 7701b, a limiting portion 7702c, a connecting portion, and a pressing portion. The structures of the mounting portion 7701a and the limiting portion 7702c are the same as in Embodiment 8. The first end face 77013b of the cylindrical portion 7701b does not have an annular groove 77014b. The portion of the first end face 77013b that contacts the second end face 180e of the driving force transmission member 180 is still the pressing portion, i.e., the ring around the periphery of the first end face 77013b. The first end face 77013b also has several connecting holes 77015b extending axially M1 through the first end face 77013b.

[0283] Referring to Figures 68-70, in this embodiment, the joint portion is telescopically disposed on the cylindrical portion 7701b along the axial direction M1. The joint portion includes a driving force receiving portion 7709c and an elastic portion 7709a. The driving force receiving portion 7709c is generally a rod-shaped member, which passes through the communicating hole 77015b of the first end face 77013b along the axial direction M1 and can move within the communicating hole 77015b. When the driving force receiving portion 7709c is in the extended state and the outer surface of the driving force receiving portion 7709c abuts against the driving transmission surface 180d of the driving force transmission portion 180v, it can receive driving force rotation. The driving force receiving part 7709c is preferably a round rod. The M1A direction end of the driving force receiving part 7709c is set as an arc surface. The M1B direction end of the driving force receiving part 7709c is located in the connecting hole 77015b and is provided with a limiting part 7709d. The limiting part 7709d can abut against the inner side of the first end face 77013b to prevent the driving force receiving part 7709c from coming out of the connecting hole 77015b. The limiting part 7709d can be a protruding structure. The elastic part 7709a is disposed between the driving force receiving part 7709c and the cylindrical part 7701b. Specifically, the cylindrical part 7701b has a support part 7709e inside. The support part 7709e can be a disc-shaped component, which is arranged parallel to the first end face 77013b. A through hole can be opened at the central axis position of the support part 7709e. The through hole is aligned with the limiting part. The support part 7709e is fixed by bolts 7709f passing through the through hole and the limiting part. One end of the elastic part 7709a abuts against the support part 7709e, and the other end abuts against the driving force receiving part 7709c. The elastic part 7709a is configured to keep the driving force receiving part 7709c in an extended state (the position where the limiting part 7709d abuts against the cylindrical part 7701b) when not subjected to external force. The interior of the driving force receiving part 7709c can be hollow. The other end of the elastic part 7709a extends into the driving force receiving part 7709c and abuts against the M1A direction end of the driving force receiving part 7709c. Optionally, the M1B direction end of the driving force receiving part 7709c can be provided with a connecting part to connect with the elastic part 7709a. The elastic part 7709a is preferably a compression spring, but it can also be various elastic components such as elastic sponge, elastic rubber, and elastic sheet.

[0284] Multiple joints can be provided, the number of which matches the number of connecting holes 77015b on the first end face 77013b. In this embodiment, four joints are provided, and the four joints are evenly distributed along the circumference. Providing multiple joints can improve the jointing efficiency.

[0285] Referring to Figures 68-72, when the drum coupling 770 moves relative to the driving force transmission member 180 along the M1A direction to engage with the driving force transmission member 180, there are two situations. The first situation is that the engagement portion of the first braking force engagement member 814 is separated from the driving transmission surface 180d, and the space (gap) between them is sufficient for the driving force receiving part 7709c to be inserted. When the two driving force receiving parts 7709c in the drum coupling 770 are aligned with the space between the first braking force engagement member 814 and the driving transmission surface 180d, the driving force receiving part 7709c can be directly inserted into the space between the first braking force engagement member 814 and the driving transmission surface 180d as the drum coupling 770 moves, and abuts against the driving transmission surface 180d to receive the driving force when the driving force transmission member 180 rotates. If the driving force receiving portions 7709c of the other two joints that are not engaged with the driving transmission surface 180d are in a position abutting against the first braking force engaging member 814 and / or the second braking force engaging member 818, then these two driving force receiving portions 7709c are in a retracted state.

[0286] The second scenario involves the engagement portion of the first braking force engagement member 814 approaching or adhering to the driving force transmission part 180v. The space between the first braking force engagement member 814 and the driving force transmission part 180v is insufficient for the driving force receiving part 7709c to insert. In this case, direct engagement is not possible. As the drum coupling 770 moves along the M1A direction, all or part of the engagement portion is abutted by components on the driving force transmission member 180 and is in a retracted state. As the driving force transmission member 180 rotates, some of the engagement portions will abut against the first braking force engagement member 814, thus retracting the driving force. The power transmission member 180 and the first braking force engagement member 814 rotate relative to each other. The first braking force engagement member 814 gradually moves away from the driving force transmission part 180v until the space between them is large enough for the driving force receiving part 7709c to be inserted and the space is aligned with other engagement parts. Under the action of the elastic part 7709a, the driving force receiving part 7709c extends along the M1A direction and inserts into the space between the first braking force engagement member 814 and the driving transmission surface 180d. When the driving force transmission member 180 rotates, it abuts against the driving transmission surface 180d to receive the driving force.

[0287] In this embodiment, the process of the pressing drive force transmission component 180 moving along the M1A direction is the same as in Embodiment 8, and will not be repeated here.

[0288] Example 10

[0289] This embodiment provides another processing box. The structure of the drum coupling 770 in this embodiment is the same as that in embodiment five. The first end face 77013b of the cylindrical part 7701b of the drum coupling 770 serves as the pressing part.

[0290] Referring to Figure 50, when the drum coupling 770 moves relative to the drive force transmission member 180 along the M1A direction, the second end of the engagement portion (protrusion 7704a) contacts the second end face 180e of the drive force transmission member 180. As the drum coupling 770 moves further in, its second end (sharp end) penetrates into and engages with the second end face 180e (i.e., the second end of protrusion 7704a protrudes from the hole on the second end face 180e and is at least partially embedded in the hole to form a synchronously rotating engagement). As the drum coupling 770 moves further along the M1A direction, the pressing portion (first end face 77013b) of the drum coupling 770 contacts the second end face 180e and pushes the drive force transmission member 180 to move along the M1A direction (moving away from the photosensitive drum 707). The first braking force connection... The receiving component 814, the second braking force receiving component 818, and the braking transmission component 817 move together along the M1A direction with the driving force transmission component 180. The braking transmission component 817 contacts the support shaft 812, the braking engagement spring 821 is compressed, the drive gear 813 disengages from the second machine baffle 823, and the driving force transmission component 180 moves to its limit position. At this point, the drum coupling 770 and the driving force transmission component 180 are engaged and can receive driving force to rotate. In the subsequent development process, since there is no movable gap in the axial direction between the first braking force receiving component 814, the second braking force receiving component 818, the braking transmission component 817 and the driving force transmission component 180, the braking transmission component 817 will not have axial movement, will not produce abnormal noise, and will not cause the photosensitive drum 707 to have axial movement.

[0291] Example 11

[0292] Referring to Figures 1-6, the drive transmission unit 811, mounted on the main assembly of the image forming apparatus, includes a drive force transmission assembly and a braking force application assembly. The drive force transmission assembly includes a drive gear 813 and a drive force transmission member 180. The braking force application assembly includes a first braking force engagement member 814 and a second braking force engagement member 818. A drum coupling 770 is provided on the processing box. The drum coupling 770 has a drive force receiving portion 770b and a braking force receiving portion 770c. The drive force receiving portion 770b engages with the drive force transmission member 180 to receive drive force, and the braking force receiving portion 770c engages with the first braking force engagement member 814 and the second braking force engagement member 818 to receive braking force.

[0293] In the above-described scheme, the drum coupling on the processing box is inserted into the image forming apparatus from the M1A direction. The guide surface 770d on the drum coupling 770 will be pressed against the end face of the drive force transmission part 180v of the drive transmission unit 811 in the M1B direction, and then slide into the predetermined position. However, when the friction is large, if the guide surface 770d and the end face of the drive force transmission part 180v cannot slide relative to each other, it will cause the drum coupling and / or drive transmission unit 811 to be unable to be installed or to be worn.

[0294] To address the aforementioned issues, this embodiment provides a processing box, which differs from Embodiment 5 in that the structure of the drum coupling is different.

[0295] Referring to Figures 73-76, in this embodiment, the drum coupling 770 includes a mounting portion 7701a, a cylindrical portion 7701b, a limiting portion 7702c, a connecting portion 7710, a guiding portion 7711, and a fixing portion 7712. The structures of the mounting portion 7701a, the cylindrical portion 7701b, and the limiting portion 7702c are the same as in Embodiment 5, and will not be described again here.

[0296] Referring to Figures 74-76, the joint portion 7710 is disposed on the outer circumferential surface of the limiting portion 7702c. The joint portion 7710 is a first protrusion that radially protrudes from the outer circumferential surface of the limiting portion 7702c. The M1B end of the joint portion 7710 is connected to the first end face 77013b, and the M1A direction end of the joint portion 7710 is approximately located at the middle position of the limiting portion 7702c in the M1A direction. The joint portion 7710 is provided with a driving force receiving portion 7710a, which is a surface of the joint portion 7710 on the upstream side in the rotation direction A of the drum coupling 770. The driving force receiving portion 7710a is a surface inclined relative to the axial direction M1. The driving force receiving portion 7710a can engage with the inclined surface 818b on the engagement portion of the second braking force engaging member 818 to receive the driving force. In this embodiment, there are two joint portions 7710, which are centrally symmetrically arranged.

[0297] Referring to Figures 74-76, the fixing part 7712 is disposed on the outer circumferential surface of the limiting part 7702c. The fixing part 7712 is a second protrusion that radially protrudes from the outer circumferential surface of the limiting part 7702c. The fixing part 7712 is spaced apart from the connecting part 7710 in the rotation direction A. The M1B end of the fixing part 7712 is connected to the first end face 77013b. Along the M1A direction, the radial width of the fixing part 7712 gradually decreases, that is, the fixing part 7712 moves away from the axis. The side surface is inclined relative to the first end face 77013b. Specifically, the fixing part 7712 includes a first part 7712a and a second part 7712b, which are axially connected. The first part 7712a is further away from the photosensitive drum 707 than the second part 7712b. The axial height of the connection point between the first part 7712a and the second part 7712b is approximately flush with the M1A direction end of the joint 7710. The slope of the outer side surface of the first part 7712a away from the axis is different from the slope of the outer side surface of the second part 7712b away from the axis. The angle between the outer side surface of the first part 7712a and the first end face 77013b is larger than the angle between the outer side surface of the second part 7712b and the first end face 77013b. The M1A end of the first part 7712a does not protrude beyond the M1A end of the limiting part 7702c. The radial width of the first part 7712a gradually increases along the M1B direction, and the radial width of the second part 7712b also gradually increases along the M1B direction. The maximum radial width of the fixing part 7712 is smaller than the radial width of the connecting part 7710. In this embodiment, there are two fixing parts 7712, which are centrally symmetrically arranged and staggered with the two connecting parts 7710 in the rotation direction A. The fixing part 7712 is used to contact the braking force connecting member and radially push the braking force connecting member apart when the drum coupling 770 is engaged with the driving force transmission member 180, so that the braking force connecting member is tightly attached to the inner wall of the driving force transmission member 180, and can prevent it from moving / rotating relative to the inner wall.

[0298] Referring to Figures 74-76, a guide portion 7711 is disposed on the outer circumferential surface of the limiting portion 7702c. The guide portion 7711 is a convex rib structure extending along the rotation direction A. The M1A direction end of the guide portion 7711 does not protrude beyond the M1A end of the limiting portion 7702c, but is further away from the first end face 77013b than the M1A end of the fixing portion 7712. Two guide portions 7711 are provided, and the two guide portions 7711 are centrally symmetrical. A notch 7711a is formed between the two guide portions 7711. The notch 7711a is at least partially aligned with the fixing portion 7712. The guide portion 7712 has a guide slope 7711b at the downstream end of the rotation direction A. The guide slope 7711b is a surface inclined relative to the axial direction. The M1A end of the guide slope 7711b (the end away from the photosensitive drum 707) is located on the upstream side of its M1B end (the end closer to the photosensitive drum 707) in the rotation direction A. The radial width of the guide portion 7711 is smaller than the maximum radial width of the fixing portion 7712 and also smaller than the radial width of the connecting portion 7710. In this embodiment, the radial widths of the guide portion 7711, the fixing portion 7712, and the connecting portion 7710 are all smaller than the inner diameter of the drive force transmission portion 180v. The guide portion 7711 is used to guide the braking force engaging member to move away from the drive transmission surface 180d of the drive force transmission portion 180v when the drum coupling 770 engages with the drive force transmission member 180.

[0299] Referring to Figures 77-79, when the drum coupling 770 moves along the M1A direction and engages with the drive force transmission member 180, two situations exist. In the first situation, the engagement portion of the second braking force engagement member 818 is not aligned with the notch 7711a between the two guide portions 7711. The M1A end face of the guide portion 7711 abuts against the end of the engagement portion of the second braking force engagement member 818. As the drum coupling 770 is further inserted along the M1A direction, the second braking force engagement member 818 and the first braking force engagement member 814 are pushed and moved along the M1A direction, compressing the drum drive coupling spring 820 and the brake engagement spring 821. When the drive force transmission member 180 begins to rotate, if the engagement portion of the first braking force engagement member 814 is in contact with the drive transmission surface 180d of the drive force transmission part 180v, the drive force transmission member 180 drives the first braking force engagement member 814 and the second braking force engagement member 818 relative to the drum coupling. The device 770 rotates; if the engagement portion of the first braking force engagement member 814 does not fit with the drive transmission surface 180d, the drive force transmission member 180 rotates relative to the first braking force engagement member 814 until it fits with it, and then drives the first braking force engagement member 814 and the second braking force engagement member 818 to rotate; when the second braking force engagement member 818 is pushed to rotate until its engagement portion is opposite to the notch 7711a of the guide portion 7711, the engagement portion contacts the guide slope 7711b, and the drum drive coupling spring 820 and the brake engagement spring 821 deform and recover, pushing the second braking force engagement member 818 and the first braking force engagement member 814 to move along the guide slope 7711b in the M1B direction, so that the second braking force engagement member 818 rotates in the rotation direction A at a speed faster than the drive force transmission member 180, thereby causing the second braking force engagement member 818 to move in the rotation direction A to a position away from the drive transmission surface 180d.Subsequently, the engaging portion of the second braking force engaging member 818 enters through the notch 7711a of the guide portion 7711, and its inner side contacts the fixing portion 7712. First, the M1A direction end of the first part 7712a of the fixing portion 7712 engages with the inner side of the second braking force engaging member 818. As the drum coupling 770 moves along the M1A direction, the fixing portion 7712 slides relative to the engaging portion of the second braking force engaging member 818, and the contact position between the engaging portion and the fixing portion 7712 moves from the first part 7712a towards the second part 7712b, that is, the engaging portion and the fixing portion... The radial width of the contact position of part 7712 gradually increases, the joint portion of the second braking force engaging member 818 is pushed away from the axis and contacts the first braking force engaging member 814. Under the pushing action of the fixing part 7712, the second braking force engaging member 818 further presses the joint portion of the first braking force engaging member 814 away from the axis, so that the joint portion of the first braking force engaging member 814 is tightly attached to the inner wall of the driving force transmission member 180. Under the action of friction, the braking force engaging member will not rotate relative to the driving force transmission member 180 during operation. Finally, the driving force receiving part 7710a of the joint 7710 engages with the inclined surface 818b of the joint portion of the second braking force engaging member 818 to receive the driving force. Due to the squeezing force of the fixing part 7712, the first braking force engaging member 814 is frictionally fixed by the driving force transmitting member 180. As the driving force transmitting member 180 rotates, the friction generated between the driving force transmitting member 180 and the first braking force engaging member 814 will drive the first braking force engaging member 814 to rotate. The first braking force engaging member 814 drives the second braking force engaging member 818 to rotate synchronously, thereby driving the drum coupling 770 to rotate and driving the processing box to work.

[0300] In the second scenario, when the second braking force engagement member 818 and the first braking force engagement member 814 are initially aligned with the notch 7711a of the guide portion 7711 of the drum coupling 770, the engagement portion of the second braking force engagement member 818 directly contacts the guide slope 7711b and is guided by the guide slope 7711b to a position away from the drive transmission surface 180d. The second braking force engagement member 818 can then enter from the notch 7711a and contact the fixing portion 7712. The fixing portion 7712 can directly compress the braking force engagement member, and the engagement portion 7710 can directly engage with the slope 818b of the second braking force engagement member 818.

[0301] In this embodiment, the radial width of the guide portion 7711, the fixing portion 7712, and the connecting portion 7710 is smaller than the inner diameter of the driving force transmission portion 180v. Furthermore, the second braking force connecting member 818, which is closer to the axis, is used for driving. This avoids the situation where the components on the drum coupling 770 are squeezed against the end face of the driving force transmission portion 180v and cannot slide relative to each other. This ensures that the drum coupling 770 can be connected smoothly, stably, and quickly, reducing the possibility of wear on the drum coupling 770 and the driving force transmission member 180.

[0302] The above descriptions are merely some embodiments of this application. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this application, and all such modifications and improvements fall within the scope of protection of this application.

Claims

1. A processing box detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, the drive force transmission member including a connecting frame, characterized in that, The processing box includes: Photosensitive frame; The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction; A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction. The drum coupling can abut against the connecting frame and receive the driving force of the connecting frame to rotate, thereby driving the photosensitive drum to rotate.

2. The processing box according to claim 1, characterized in that, The drum coupling includes a main body, a idling part, and a drive part. The main body is disposed at one end of the photosensitive drum in a first direction. The idling part can engage with the braking force engagement member and idle relative to the main body. The drive part can receive the driving force of the connecting frame to drive the main body to rotate synchronously to drive the photosensitive drum.

3. The processing box according to claim 2, characterized in that, Before the driving unit drives the main body to rotate synchronously, the driving unit can rotate relative to the main body and also have axial movement.

4. The processing box according to claim 3, characterized in that, The drive unit rotates relative to the main body unit under the drive of the idler unit and / or the connecting frame.

5. The processing box according to claim 4, characterized in that, The idle part is provided with a mating hole, and the driving part is provided with a driving rod. When the driving part rotates and moves axially, the driving rod moves axially within the mating hole.

6. The processing box according to claim 5, characterized in that, The main body is provided with a first guide portion, and the drive portion is provided with a second guide portion that cooperates with the first guide portion. The first guide portion and the second guide portion cooperate to guide the drive portion to rotate relative to the main body while having axial movement.

7. The processing box according to claim 5, characterized in that, The idling part can rotate by abutting the drive rod through the mating hole.

8. The processing box according to claim 5, characterized in that, The drive rod can extend out of the mating hole in a first direction to reach the position abutting against the connecting frame, so as to receive the driving force of the connecting frame.

9. The processing box according to claim 7, characterized in that, The drive rod has a top portion, the outer diameter of which decreases along the first direction.

10. The processing box according to claim 5, characterized in that, The idling part has a first rotating protrusion, and the driving part has a second rotating protrusion. When the idling part is idling, the first rotating protrusion pushes the second rotating protrusion, causing the driving part to rotate.

11. The processing box according to claim 7, characterized in that, When the mating hole abuts against the drive rod on its upstream inner wall in the rotation direction, the mating hole can push the drive rod to rotate the drive part.

12. The processing box according to claim 6, characterized in that, The first guide portion is a guide groove provided on the inner wall of the main body portion, and the guide groove extends spirally relative to the axial direction; The second guide portion is a guide rib provided on the outer wall of the drive portion, and the guide rib extends spirally relative to the axial direction; the guide rib is adapted to the guide groove.

13. The processing box according to any one of claims 3-12, characterized in that, The main body is provided with a first driving protrusion, and the driving part is provided with a second driving protrusion. When the driving part rotates relative to the main body, the first driving protrusion and the second driving protrusion are offset from each other in the axial direction. When the driving part rotates relative to the main body and moves along the first direction, the second driving protrusion approaches the first driving protrusion in the axial direction. When the driving part is driven by the connecting frame alone, the second driving protrusion abuts against the first driving protrusion and pushes the first driving protrusion to rotate the main body.

14. The processing box according to any one of claims 6-9, characterized in that, The drum coupling also includes a rotating component that abuts against the drive unit. The rotating component has a fourth guide portion, and the idle part is provided with a third guide portion that cooperates with the fourth guide portion. When the idle part rotates, the fourth guide portion can push the rotating component to move axially, and the rotating component pushes the drive unit that abuts against it to move axially.

15. The processing box according to claim 14, characterized in that, The main body is provided with a drive groove, which is connected to the first guide part. When the second guide part moves from the first guide part to the drive groove and abuts against it, the drive part can drive the main body to rotate.

16. The processing box according to claim 15, characterized in that, The first guide portion is a spiral groove, and the second guide portion is a protruding structure that can move within the first guide portion.

17. The processing box according to claim 16, characterized in that, The third guide portion is provided on the spiral groove on the circumferential wall of the idling part, the third guide portion has the same slope as the first guide portion, and the fourth guide portion is a protruding structure that can move within the third guide portion.

18. The processing box according to any one of claims 2-12 and 15-17, characterized in that, The drum coupling also includes an elastic element disposed between the idling part and the driving part, the elastic element being configured to apply a force toward the driving part in a second direction.

19. The processing box according to claim 2, characterized in that, The idling part is rotatably supported on the photosensitive frame, the photosensitive frame is provided with a fifth guide part, and the idling part is provided with a sixth guide part that cooperates with the fifth guide part. The cooperation between the fifth guide part and the sixth guide part enables the idling part to rotate relative to the main body while having axial movement.

20. The processing box according to claim 19, characterized in that, The idling part is provided with a mating hole, and the driving part is provided with a driving rod. When the idling part rotates and moves axially, the driving rod is exposed from the mating hole.

21. The processing box according to claim 20, characterized in that, It also includes a first elastic element disposed between the main body and the idling part, for positioning the idling part in an initial position away from the photosensitive drum in a first direction.

22. The processing box according to claim 21, characterized in that, The driving part is provided with a driving protrusion, and the main body is provided with a driving groove that cooperates with the driving protrusion. The driving part drives the main body to rotate synchronously through the abutment between the driving protrusion and the driving groove.

23. The processing box according to claim 22, characterized in that, A second elastic element is also provided between the driving part and the main body part, the second elastic element causing the driving part to be positioned away from the photosensitive drum in a first direction.

24. The processing box according to claim 20, characterized in that, The mating hole abuts against the drive rod and can push the drive rod to rotate the drive unit.

25. The processing box according to claim 19, characterized in that, The idling part is provided with a force-receiving part, and a first elastic element is provided between the idling part and the photosensitive frame. The first elastic element applies a force to the idling part that is opposite to the direction of rotation.

26. The processing box according to claim 25, characterized in that, The driving part is rotatably disposed within the main body. The main body is provided with a first driving protrusion, the first driving protrusion having a driving force receiving surface. The driving part is provided with a second driving protrusion, the second driving protrusion being able to contact the driving force receiving surface to push the first driving protrusion, thereby causing the main body to rotate.

27. The processing box according to claim 26, characterized in that, The main body is provided with a free-spinning groove, and the second drive protrusion can move within the free-spinning groove.

28. The processing box according to claim 27, characterized in that, A second elastic element is provided between the main body and the driving part, and the second elastic element causes the second driving protrusion to be located away from the driving force receiving surface.

29. The processing box according to any one of claims 19-28, characterized in that, The idling section includes an idling force engagement section, which is engaged with the driving force transmission section and the braking force engagement component.

30. A processing box detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, characterized in that, The processing box includes: Photosensitive frame; The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction; A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction. The drum coupling is provided with a joint, which receives driving force by engaging with the second end face of the drive transmission member.

31. The processing box according to claim 30, characterized in that, The joint has a surface that is inclined relative to the axial direction of the photosensitive drum.

32. The processing box according to claim 31, characterized in that, Along the first direction, the radial width of the joint decreases.

33. The processing box according to claim 32, characterized in that, The joint has a first end and a second end in the axial direction, the second end being further away from the photosensitive drum than the first end, the drum coupling having a first end face in a first direction, the first end being connected to the first end face, and the second end protruding along the first direction.

34. The processing box according to claim 33, characterized in that, The second end is a sharp end.

35. The processing box according to claim 33, characterized in that, The first end face is a pressing part. When the drum coupling is engaged with the drive transmission unit, the pressing part abuts against the second end face and presses the drive transmission unit to move it in the first direction.

36. The processing box according to any one of claims 30-34, characterized in that, The joint includes one or more protrusions; or, the joint includes one or more annular protrusions.

37. The processing box according to any one of claims 30-34, characterized in that, The drum coupling also includes a protective portion that encloses the engagement portion inside it.

38. The processing box according to claim 37, characterized in that, The protective part is a second annular protrusion, and the inner diameter of the second annular protrusion increases along the first direction.

39. A processing box detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, the drive force transmission member including a connecting frame, characterized in that, The processing box includes: Photosensitive frame; The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction; A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction. The drum coupling is provided with a connecting part and a pressing part. The connecting part receives driving force by engaging with the drive transmission unit. When the drum coupling is engaged with the drive transmission unit, the pressing part abuts against the drive transmission unit and presses the drive transmission unit to move it in the first direction.

40. The processing box according to claim 39, characterized in that, The joint portion is a third annular protrusion, and the pressing portion is the end face of the third annular protrusion in the first direction.

41. The processing box according to claim 40, characterized in that, The joint is provided with a notch, which can engage with the connecting frame.

42. The processing box according to claim 41, characterized in that, The joint includes a driving force receiving part, which is a side surface of the notch in the circumferential direction. When the notch is engaged with the connecting frame, the driving force receiving part abuts against the side surface of the connecting frame to receive the driving force.

43. The processing box according to claim 42, characterized in that, The braking force engagement component includes a first braking force engagement component and a second braking force engagement component, and there is a radial gap between the first braking force engagement component and the second braking force engagement component. When the drum coupling engages with the drive transmission unit, the third annular protrusion is inserted into the gap.

44. The processing box according to claim 43, characterized in that, When the drum coupling engages with the drive transmission unit, the pressing part abuts against the first braking force engagement member and / or the second braking force engagement member to push the drive transmission unit to move along the first direction.

45. The processing box according to claim 44, characterized in that, When the drum coupling engages with the drive transmission unit, the pressing part abuts against the end face of the connecting frame in the second direction to push the drive transmission unit to move in the first direction.

46. ​​The processing box according to claim 39, characterized in that, The joint is a fourth annular protrusion, and the fourth annular protrusion has a notch, which can engage with the driving force transmission part on the driving transmission unit.

47. The processing box according to claim 46, characterized in that, The joint includes a driving force receiving portion, which is a side surface of the notch in the circumferential direction.

48. The processing box according to claim 47, characterized in that, The driving force receiving part is an inclined surface that is tilted relative to the axial direction of the photosensitive drum.

49. The processing box according to claim 39, characterized in that, The joint is telescopically mounted on the drum coupling along the axial direction of the photosensitive drum.

50. The processing box according to claim 49, characterized in that, The joint includes a driving force receiving part and an elastic part. The elastic part is disposed between the driving force receiving part and the drum coupling, so that the driving force receiving part is in an extended state.

51. The processing box according to any one of claims 39-50, characterized in that, The pressing part is the end face of the drum coupling in the first direction. When the drum coupling is engaged with the drive transmission unit, the pressing part abuts against the second end face of the drive transmission member and presses the drive transmission unit to move it in the first direction.

52. A processing box detachably mounted in an image forming apparatus, the image forming apparatus including a drive transmission unit, the drive transmission unit including a drive force transmission member and a braking force engagement member located inside the drive force transmission member, characterized in that, The processing box includes: Photosensitive frame; The photosensitive drum is rotatably supported on the photosensitive frame along the axial direction; A drum coupling is axially disposed at one end of the photosensitive drum in a first direction, and the drum coupling is capable of approaching the drive transmission unit along the first direction to engage with the drive transmission unit; the direction axially opposite to the first direction is the second direction. The coupling includes a fixing part, which can compress the braking force engagement member so that the braking force engagement member is tightly against the inner wall of the driving force transmission member.

53. The processing box according to claim 52, characterized in that, Along the second direction, the radial width of the fixing part increases.

54. The processing box according to claim 53, characterized in that, The outer surface of the fixing part away from the axis is an inclined surface, which is inclined relative to the axial direction.

55. The processing box according to claim 54, characterized in that, The fixing part includes a second part and a first part that are connected and disposed along the first direction.

56. The processing box according to claim 55, characterized in that, The drum coupling has a first end face perpendicular to the axial direction, and the angle between the outer side of the first part and the first end face is larger than the angle between the outer side of the second part and the first end face.

57. The processing box according to any one of claims 52-56, characterized in that, The drum coupling includes a engagement portion that can engage with the braking force engagement member to receive driving force.

58. The processing box according to claim 57, characterized in that, The joint and the fixing part are arranged alternately in the rotational direction.

59. The processing box according to claim 57, characterized in that, The radial width of the joint is greater than the maximum radial width of the fixing part.

60. The processing box according to any one of claims 58-59, characterized in that, The drum coupling includes a guide portion for moving the braking force engagement member relative to the driving force transmission member.

61. The processing box according to claim 60, characterized in that, The radial width of the guide portion is less than the maximum radial width of the fixing portion.

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