Developing box

Abstract

The utility model discloses a developing box which comprises a box body provided with a first end and a second end in a first direction and a third end and a fourth end in a second direction, and the first direction and the second direction are mutually crossed; the developing roller rotates around the axis of the developing roller extending in the first direction, and the developing roller is located at the third end; the transmission assembly is located at the first end and comprises a driving part which receives external power and rotates around a driving axis extending in the first direction; the forced pushing assembly is used for receiving external acting force, and in the second direction, the forced pushing assembly is located between the axis of the developing roller and the driving axis. According to the scheme, the rotating piece comprises the first rotating part and the second rotating part which can rotate relatively, so that when the first rotating part rotates reversely, the second rotating part does not drive the developing roller to rotate reversely and is not subjected to acting force which is applied by the photosensitive drum and is opposite to the force of reverse rotation, and the power output piece can stop rotating normally.

Description

Technical Field

[0001] The utility model relates to the technical field of image forming devices, and particularly relates to a developing cartridge. Background Art

[0002] A developing cartridge is a detachable part widely used in an image forming device. A disconnecting transmission member, a separating lever, a drum assembly and a power output member are arranged on the image forming device. A photosensitive drum is arranged on the drum assembly. The developing cartridge can be installed on the drum assembly. A developing roller is arranged on the developing cartridge. The developing roller contacts the photosensitive drum to transfer the developer in the developing cartridge. The developing cartridge is provided with a power receiving member. The power receiving member cooperates with the power output member and rotates following the power output member. The power receiving member transfers the power to the developing roller to make the developing roller rotate. The developing cartridge can receive the separating force applied by the separating lever and the drum assembly to separate the developing roller from the photosensitive drum, avoiding damage caused by long-term contact between the two. Before the developing roller and the photosensitive drum are separated, the image forming device issues an instruction to make the power output member rotate reversely by a certain angle, and then the disconnecting transmission member acts on the power output member to make the power output member rotate forward by a certain angle and then stop rotating, so that the power receiving member no longer receives power. In existing products, when the developing roller contacts the photosensitive drum, it receives a force opposite to the reverse rotation force. The developing roller transfers this force to the power output member through the power receiving member, so that the power receiving member cannot rotate reversely normally, and the disconnecting transmission member cannot make the power output member stop rotating, and the image forming device reports an error.

[0003] A pressing component is arranged on the developing cartridge. The pressing component is abutted by an external component to receive a pressing force. The pressing force is directed towards the photosensitive drum to make the developing roller and the photosensitive drum in close contact. In the prior art, the toner in the cartridge body is chemical toner, and the two pressing parts in the pressing component are symmetrically arranged, resulting in a printing defect of colored edges in the image formed by the image forming device. Summary of the Utility Model

[0004] According to one aspect of the utility model, a developing cartridge is provided, comprising:

[0005] A cartridge body having a first end and a second end in a first direction and a third end and a fourth end in a second direction, the first direction and the second direction intersecting each other;

[0006] A developing roller rotating around a developing roller axis extending in the first direction, the developing roller being located at the third end;

[0007] A transmission assembly located at the first end, comprising a driving part that receives external power and rotates around a driving axis extending in the first direction;

[0008] A storage medium storing information of the developing cartridge;

[0009] A pushing component that receives an external force and is located between the axis of the developing roller and the driving axis in the second direction.

[0010] In some embodiments, the transmission component includes a rotating member that transmits power to the developing roller. The rotating member includes a first rotating portion and a second rotating portion arranged coaxially. The first rotating portion and the second rotating portion can rotate relative to each other, and there is a gap between the first rotating portion and the second rotating portion in the rotating direction of the rotating member.

[0011] In some embodiments, the first rotating portion includes a first engaging portion, and the second rotating portion includes a second engaging portion. One of the first engaging portion and the second engaging portion is a protrusion extending in the first direction, and the other is a card slot recessed in the first direction. The first engaging portion engages with the second engaging portion so that the first engaging portion drives the second engaging portion to rotate.

[0012] In some embodiments, in the rotating direction of the rotating member, the size of the card slot is larger than the size of the protrusion.

[0013] In some embodiments, the rotating member is a driving portion, the first rotating portion is a power receiving portion, the first rotating portion receives external power and rotates, the second rotating portion is a driving gear, and the transmission component further includes a developing gear. The developing gear meshes with the driving gear to receive power and rotate.

[0014] In some embodiments, the angle of rotation of the power receiving portion relative to the driving gear is 15° to 360°.

[0015] In some embodiments, the rotating member is a developing gear, the second rotating portion is fixedly connected to the developing roller, and the first rotating portion receives the power transmitted by the driving portion and rotates to drive the second rotating portion to rotate.

[0016] In some embodiments, it further includes a third rotating portion and a fourth rotating portion that can rotate relative to each other.

[0017] In some embodiments, the pushing component includes a first pushing portion at the first end and a second pushing portion at the second end. When observed along the first direction, at least part of the first pushing portion and the second pushing portion do not overlap.

[0018] In some embodiments, in the second direction, the first pushing portion is closer to the axis of the developing roller than the second pushing portion.

[0019] In some embodiments, the developing cartridge is detachably mounted on the drum assembly, the drum assembly applies a pushing force to the pushing assembly, and the first pushing force received by the first pushing portion is less than the pushing force received by the second pushing portion.

[0020] In some embodiments, a first separating portion is further included. The first separating portion receives a separating force to move the developing cartridge against the first pushing force. The first separating portion is disposed at the first end. In the second direction, the first separating portion is closer to the axis of the developing roller than the first pushing portion.

[0021] Advantageous effects of the present utility model: The rotating member of this solution includes a first rotating portion and a second rotating portion that can rotate relative to each other. It can be realized that when the first rotating portion rotates in the reverse direction, the second rotating portion does not drive the developing roller to rotate in the reverse direction, and it will not be subjected to the acting force opposite to the reverse rotation force applied by the photosensitive drum, and the power output member can normally stop rotating. The two pushing portions of the pushing assembly are arranged one in front of the other, so that the pushing forces received at both ends of the developing roller are inconsistent, which can effectively solve or improve the color edge problem in the imaging of the image forming device and ensure the imaging quality of the image forming device. Description of the Drawings

[0022] Figure 1 is a schematic structural view of the developing cartridge in Embodiment 1;

[0023] Figure 2 is a schematic structural view of the second end of the developing cartridge in Embodiment 1;

[0024] Figure 3 is a schematic structural view of the first end of the developing cartridge in Embodiment 1;

[0025] Figure 4 is a schematic structural view of the power output member outputting power to the transmission assembly in Embodiment 1;

[0026] Figure 5 is an exploded view of the first end of the developing cartridge in Embodiment 1;

[0027] Figure 6 is a schematic structural view of the power receiving portion and the driving gear in Embodiment 1;

[0028] Figure 7 is an exploded view of the first end of the developing cartridge in Embodiment 2;

[0029] Figure 8 is an exploded view of the first end of the developing cartridge in another embodiment of Embodiment 2;

[0030] Figure 9 is a schematic structural view of the drum assembly in Embodiment 3;

[0031] Figure 10It is a side view of the second pressing part projected onto the first end in the third embodiment;

[0032] Figure 11 It is a cross-sectional view of the developing cartridge installed on the drum unit in the third embodiment;

[0033] Figure 12 It is a cross-sectional view of the developing cartridge installed on the drum unit from another angle in the third embodiment. Detailed implementation manners

[0034] The present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.

[0035] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] In the above description, descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0039] In the following description of directions, when observing in a direction perpendicular to Figure 1 the plane of the paper in Figure 1 the left side of the plane of the paper in Figure 1 is the left, Figure 1 the right side of the plane of the paper in Figure 1 is the right, Figure 1 the upper side of the plane of the paper in Figure 1 is the upper,

[0040] Embodiment 1:

[0041] As Figures 1-7 shown, this embodiment provides a developing cartridge 1. The developing cartridge 1 is detachably installed on the image forming apparatus. A power output member 101, a disconnecting transmission member, a separating lever, and a drum assembly are provided on the image forming apparatus. A photosensitive drum is provided on the drum assembly. The developing cartridge 1 is detachably installed on the drum assembly. The power output member 101 is rotatable and used to transmit power to the developing cartridge 1. The developing cartridge 1 includes a cartridge body 10, a developing assembly, a transmission assembly, a first cover 111, and an identification assembly.

[0042] As Figure 1As shown in the figure, the cartridge 10 has a receiving cavity for accommodating the developer. The cartridge 10 has a first end 11 and a second end 12 oppositely arranged in the first direction, a third end 13 and a fourth end 14 oppositely arranged in the second direction, and a fifth end 15 and a sixth end oppositely arranged in the third direction. A friction portion 151 is provided at the fifth end 15, and a plurality of ribs extending in the first direction are provided on the friction portion 151. The friction portion 151 is used to facilitate the user to pick up the developer cartridge 1. The transmission assembly is located at the first end 11 and is used to receive external power to drive the components in the developer cartridge 1. The external power can be provided by an image forming apparatus. The first cover 111 is detachably and fixedly installed at the first end 11 of the cartridge 10. The first cover 111 at least covers a part of the transmission assembly, and the first cover 111 is used to protect the transmission assembly.

[0043] As Figure 1 shown, the developing assembly includes a developing roller 131, an agitating frame (not shown), and a powder feeding roller (not shown). The developing roller 131, the agitating frame, and the powder feeding roller are all rotatably installed on the cartridge 10. The developing roller 131 rotates around a developing roller axis extending in the first direction. The powder feeding roller is disposed adjacent to the developing roller 131, and in the second direction, the developing roller 131 is closer to the third end 13 than the powder feeding roller. The agitating frame is used to agitate the developer in the cartridge 10 to cause friction of the developer and prevent the developer from caking. The developing roller 131 is used to contact the photosensitive drum to transfer the developer to the photosensitive drum. The developing assembly further includes a blade in contact with the developing roller 131, and the blade is used to control the thickness of the developer layer on the surface of the developing roller 131.

[0044] As Figure 1 and Figure 3 shown, the identification assembly is located at the first end 11. In this embodiment, the identification assembly is specifically a storage medium 113. The storage medium 113 is used to store information of the developer cartridge 1. When the developer cartridge 1 is installed in the image forming apparatus, the information is transmitted to the image forming apparatus so that the developer cartridge 1 can be identified by the image forming apparatus. The storage medium 113 is supported by a bracket 114, and the bracket 114 can move relative to the cartridge 10. The storage medium 113 can move relative to the cartridge 10 following the bracket 114. In some embodiments, the bracket 114 and the storage medium 113 may not move relative to the cartridge 10.

[0045] As Figure 1 and Figure 3As shown, the developing cartridge 1 further includes an assembly 112 located at the first end 11. In this embodiment, the assembly 112 is detachably mounted on the first cover 111. In some embodiments, the assembly 112 may be integrally formed with the first cover 111. The assembly 112 includes a first guiding portion 1121, a first separating portion 1122, and a first pushing portion 1123, which are integrally formed or combined. The first guiding portion 1121 is arc-shaped toward the third end 13. The first guiding portion 1121 is used to guide the developing cartridge 1 when the developing cartridge 1 is mounted on the drum assembly, so that the developing cartridge 1 can be smoothly mounted. The first separating portion 1122 protrudes in the first direction away from the first end 11 (protrudes to the right). The first separating portion 1122 is used to receive the separating force applied by the drum assembly, so that the developing roller 131 and the photosensitive drum on the drum assembly are separated. The first pushing portion 1123 is located below the first separating portion 1122 in the third direction and behind the first guiding portion 1121 in the second direction. The first pushing portion 1123 contacts the force-applying assembly on the drum assembly to receive the pushing force applied by the drum assembly, so that the developing roller 131 and the photosensitive drum are in close contact.

[0046] As Figure 1 and Figure 2 As shown, the second end 12 is provided with a second cover 121, a second separating portion 122, a second guiding portion 123, a second pushing portion 124, and a locked portion 125. The second separating portion 122 is used to receive the separating force applied by the separating lever, so that the developing roller 131 and the photosensitive drum are out of contact. The second separating portion 122 is movable relative to the cartridge body 10. The second cover 121 is used to prevent the second separating portion 122 from detaching. The second guiding portion 123 is cylindrical. In this embodiment, the second guiding portion 123 is sleeved on one end of the developing roller 131 close to the second end 12. The second guiding portion 123 is used to guide the developing cartridge 1 to be smoothly mounted on the drum assembly. The second pushing portion 124 contacts the force-applying assembly on the drum assembly to receive the pushing force applied by the drum assembly, so that the developing roller 131 and the photosensitive drum are in close contact. In this embodiment, the first pushing portion 1123 and the second pushing portion 124 together form a pushing assembly. The pushing assembly is used to receive an external force (pushing force). The first pushing portion 1123 and the second pushing portion 124 are overlapped in the first direction. In the second direction, the first pushing portion 1123 and the second pushing portion 124 are located between the driving axis of the driving portion 40 and the developing roller axis of the developing roller 131. In this embodiment, the second pushing portion 124 is made of a conductive material, that is, the second pushing portion 124 serves as an electrode to receive the voltage output by the image forming apparatus. The second pushing portion 124 is electrically connected to the developing roller 131 and the powder feeding roller to transfer the voltage to the developing roller 131 and the powder feeding roller. The locked portion 125 is provided on the second cover 121. The locked portion 1231 is used to be locked by the drum assembly to prevent the developing cartridge 1 from detaching.

[0047] As Figures 3-6As shown, the transmission assembly is disposed at the first end 11. The transmission assembly includes a driving part 40, a developing gear 41, a powder feeding gear 42, a first idler gear 43, a second idler gear 44, and a stirring gear 45. At the first end 11, there is a support column 116 extending in the first direction. The driving part 40 is rotatably supported by the support column 116. The driving part 40 is configured to receive the power output by the image forming device and rotate around the driving shaft in the first direction. The driving part 40 transmits the power to the remaining gears in the transmission assembly. The driving part 40 includes a power receiving member 401 and a driving gear 402 that rotate coaxially and are assembled separately. In the first direction, at least part of the power receiving member 401 is farther from the second end 12 than the driving gear 402. The power receiving member 401 is configured to receive the power output by the power output member 101 and rotate. The right end of the power receiving member 401 has a groove that is concave in the direction approaching the first end 11 in the first direction. A driven protrusion 4012 is disposed in the groove. The power output member 101 is inserted into the groove of the power receiving member 401 and abuts against the driven protrusion 4012 so that the power receiving member 401 follows the power output member 101 to rotate (rotate forward). The left end of the power receiving member 401 is provided with a first engaging portion 4011. The first engaging portion 4011 is a protrusion that extends leftward in the first direction, and one or more (preferably two) protrusions may be provided. The plurality of protrusions are arranged at intervals along the rotation direction of the power receiving member 401. The right end of the driving gear 402 is provided with a second engaging portion 4021. The second engaging portion 4021 is a card slot (preferably an arc-shaped slot) that is concave rightward in the first direction. The number of the card slots is adapted to the protrusions. In the rotation direction of the driving part 40, the size of the card slot is larger than that of the protrusion. That is, when the protrusion is snapped into the card slot, there is a gap between the two in the rotation direction. When the first engaging portion 4011 and the second engaging portion 4021 are engaged with each other, since there is a gap between the first engaging portion 4011 and the second engaging portion 4021 in the rotation direction of the driving part 40, the driving gear 402 and the power receiving member 401 can rotate relative to each other. When the power receiving member 401 rotates relative to the first engaging portion 4011 and the second engaging portion 4021 abuts against one end of the first engaging portion 4011, the power receiving member 401 can drive the driving gear 402 to follow the power receiving member 401 to rotate forward. When the power receiving member 401 rotates reversely, since there is a gap between the first engaging portion 4011 and the second engaging portion 4021, the driving gear 402 does not follow the power receiving member 401 to rotate reversely. That is, the driving part 40 is the rotating member in this embodiment, the power receiving member 401 is the first rotating part, and the driving gear 402 is the second rotating part. The two are coaxially arranged, and the first rotating part and the second rotating part can rotate relative to each other.

[0048] Optionally, the first engaging portion 4011 may be set as a card slot, and the second engaging portion 4021 may be set as a protrusion, as long as there is a gap in the rotation direction when the two are engaged.

[0049] Furthermore, a buckle 40111 may be provided at the left end of the first engaging portion 4011 (protrusion). When the protrusion is inserted into the card slot, the buckle 40111 engages with the card slot, thereby preventing the power receiving member 401 from disengaging from the driving gear 402 outwardly. To facilitate the engagement and stability between the first engaging portion 4011 and the second engaging portion 4021, the first engaging portion 4011 can produce a slight elastic deformation.

[0050] As Figure 4 and Figure 5 shown, the second idler gear 44 includes a first gear portion 441 and a second gear portion 442. The diameter of the first gear portion 441 is larger than that of the second gear portion 442. In the first direction, the first gear portion 441 is farther from the first end 11 than the second gear portion 442. The powder feeding gear 42 and the first gear portion 441 are engaged with the driving gear 402 to receive power and rotate. The powder feeding gear 42 is engaged with the first idler gear 43 to transmit power. The first idler gear 43 is engaged with the developing gear 41 to transmit power (the developing gear 41 can be directly or indirectly engaged with the driving gear 402). The second gear portion 442 is engaged with the stirring gear 45 to transmit power. The developing gear 41 is fixedly installed at one end of the developing roller 131 located at the first end 11 and drives the developing roller 131 to rotate. The powder feeding gear 42 is fixedly installed at one end of the powder feeding roller located at the first end 11 and drives the powder feeding roller to rotate. The stirring gear 44 is fixedly installed at one end of the stirring frame located at the first end 11 to receive power and drive the stirring frame to rotate. The meshing relationship and quantity between the gears are not limited in this embodiment and can be set according to actual requirements.

[0051] Before the image forming apparatus outputs a separating force to separate the developing roller 131 from the photosensitive drum, the image forming apparatus issues an instruction for the power output member 101 to stop rotating, specifically, disconnecting the action of the transmission member on the power output member 101, so that the power output member 101 no longer rotates, and further the power receiving member 401 no longer rotates.

[0052] During the process of the power output member 101 stopping rotating, the power output member 101 will first rotate in the reverse direction by a certain angle, thereby causing the power receiving member 401 to rotate in the reverse direction. Since there is a gap in the rotation direction between the power receiving member 401 and the driving gear 402 (the gap between the first engaging portion 4011 and the second engaging portion 4021), the power receiving member 401 rotates in the reverse direction relative to the driving gear 402, that is, the driving gear 402 does not rotate in the reverse direction. That is, except for the power receiving member 401, the remaining components in the transmission assembly, the developing roller 131, and the powder feeding roller do not rotate in the reverse direction. The angle by which the power receiving member 401 rotates in the reverse direction relative to the driving gear 402 is not less than 15°, further 15° to 360°. The specific angle can be determined by the size of the gap between the first engaging portion 4011 and the second engaging portion 4021. Then, the transmission member's action on the power output member 101 is disconnected so that the power output member 101 no longer rotates. Specifically, the transmission member that drives the power output member 101 to rotate forward again is disconnected. After rotating by a certain angle, the power output member 101 stops rotating, and then the power receiving member 401 stops rotating. The transmission assembly, the developing roller 131, the powder feeding roller, etc. all stop rotating. The first separating portion 1122 and the second separating portion 122 respectively receive the separating forces applied by the drum assembly and the separating rod, and drive the developing cartridge 1 to move away from the photosensitive drum so that the developing roller 131 is separated from the photosensitive drum.

[0053] If the power receiving member 401 does not rotate in the reverse direction relative to the driving gear 402, but drives the driving gear 402 to rotate in the reverse direction together, then the driving gear 402 will drive the remaining gears in the transmission assembly to rotate in the reverse direction. As a result, the developing roller 131 rotates in the reverse direction. When the developing roller 131 contacts the photosensitive drum, it receives a force applied by the photosensitive drum that is opposite to the reverse rotation force. After this force is transmitted to the power output member 101, the power output member 101 receives two opposite forces and cannot rotate in the reverse direction normally. Disconnecting the transmission member cannot make the power output member 101 stop rotating, and the image forming apparatus cannot work properly. On the other hand, the reverse rotation of the developing roller 131 may cause the developer to leak. At the same time, the reverse rotation of the developing roller 131 and the friction with the photosensitive drum will cause wear to both of them, thereby affecting the imaging quality of the image forming apparatus.

[0054] In some embodiments, after the power receiving member 401 rotates in the reverse direction relative to the driving gear 402, it can drive the driving gear 402 and the developing assembly to perform a slight reverse rotation, as long as this slight reverse rotation does not affect the reverse rotation of the power output member 101.

[0055] Embodiment Two:

[0056] Unless otherwise specified, the structure of the developing cartridge in this embodiment is the same as that in Embodiment One. The main difference between this embodiment and Embodiment One is that in this embodiment, the power receiving member 401 and the driving gear 402 are integrally formed.

[0057] As shown Figure 7 in the figure, in this embodiment, the power receiving member 401 and the driving gear 402 are integrally formed, that is, they cannot rotate relative to each other. The developing gear includes a third gear portion 411 and a first sleeved portion 412 arranged coaxially. In the first direction, the third gear portion 411 is farther from the second end 12 than the first sleeved portion 412. The first sleeved portion 412 is fixedly installed on the developing roller 131. The third gear portion 411 is in transmission connection with the first sleeved portion 412. The third gear portion 411 and the first sleeved portion 412 can be provided with, for example, the first engaging portion 4121 and the second engaging portion 4111 (i.e., protrusions and grooves) of the first embodiment to engage with each other, so that there is also a gap between the third gear portion 411 and the first sleeved portion 412 in the rotational direction. Preferably, one or more protrusions are provided on the first sleeved portion 412, and a mating groove (arc-shaped groove) is provided on the third gear portion 411. The third gear portion 411 drives the developing roller 131 to rotate forward through the first sleeved portion 412. When the power output member 101 drives the driving portion 40 to rotate reversely, the driving portion 40 transmits the reversely rotating power to the remaining gears of the transmission assembly. The third gear portion 411 of the developing gear rotates reversely. The third gear portion 411 rotates reversely relative to the first sleeved portion 412. Since there is a gap between the third gear portion 411 and the first sleeved portion 412, the third gear portion 411 rotates reversely relative to the first sleeved portion 412, and the first sleeved portion 412 does not rotate reversely, that is, the developing roller 131 does not rotate reversely and will not be subjected to a force opposite to the reversely rotating force applied by the photosensitive drum. The power output member 101 can stop rotating normally. That is, in this embodiment, the developing gear is a rotating member, the third gear portion 411 is the first rotating portion, and the first sleeved portion 412 is the second rotating portion.

[0058] As shown Figure 8As shown, in some embodiments, the remaining gears in the remaining transmission components can also be designed separately. For example, the powder feeding gear 42 meshing with the driving gear 402 includes a fourth gear portion 421 and a second sleeving portion 422. The second sleeving portion 422 is fixedly installed on the powder feeding roller. The fourth gear portion 421 and the second sleeving portion 422 are in transmission connection through the first engaging portion and the second engaging portion (i.e., the protrusion and the card slot) as described above. The fourth gear portion 421 drives the powder feeding roller to rotate forward through the second sleeving portion 422. The fourth gear portion 421 and the second sleeving portion 422 can rotate relative to each other (i.e., the third rotating portion and the fourth rotating portion that rotate relative to each other), that is, there is a gap between them in the rotation direction. The first gear portion 441 and the second gear portion 442 of the second idler gear 44 are separately connected and can rotate relative to each other, that is, there is a gap between them in the rotation direction. The first gear portion 441 and the second gear 442 are also in transmission connection through the first engaging portion and the second engaging portion (i.e., the protrusion and the card slot). When the power output member 101 rotates in the reverse direction, the driving portion 40 transmits the power of the reverse rotation to the fourth gear portion 421 and the first gear portion 441. The fourth gear portion 421 rotates in the reverse direction relative to the second sleeving portion 422, and the first gear portion 441 rotates in the reverse direction relative to the second gear portion 442, that is, the power of the reverse rotation is not transmitted to the powder feeding roller and the stirring frame, that is, the entire developing assembly does not rotate in the reverse direction. Without the second idler gear, the stirring gear 45 can be separately formed into a fifth gear portion and a third sleeving portion to prevent the stirring frame from rotating in the reverse direction.

[0059] It can be known that this embodiment can be used in combination with Embodiment 1.

[0060] Embodiment 3

[0061] Compared with Embodiment 1, the difference in this embodiment is that the structure of the pressing component is different.

[0062] As Figures 9-12 As shown, in this embodiment, the developing cartridge 1 is detachably installed on the drum assembly 2 of the image forming apparatus, and the drum assembly 2 is used to carry the developing cartridge 1. The drum assembly 2 includes a first side wall 21, a second side wall 22, and a photosensitive drum 23. The photosensitive drum 23 is rotatably supported by the first side wall 21 and the second side wall 22, and the photosensitive drum 23 receives the developer provided by the developing cartridge 1 to form an electrostatic latent image. The drum assembly 2 further includes a pressing component, and the pressing component applies a pressing force to the developing cartridge 1. The pressing component includes a first pressing member 211 and a second pressing member 221. The first pressing member 211 is disposed close to the first side wall 21, and the second pressing member 221 is disposed close to the second side wall 22. The first pressing member 211 is connected with a first elastic member, and the second pressing member 221 is connected with a second elastic member. The first pressing member 211 and the second pressing member 221 can move relative to the photosensitive drum 23, and the first elastic member and the second elastic member can be compressed.

[0063] As Figure 10As shown in the figure, in this embodiment, the pushing component includes a first pushing part 1123 located at the first end 11 and a second pushing part 124 located at the second end 12. The two are staggeredly arranged in the second direction, that is, when observed along the first direction, at least part of them do not overlap. In the second direction, the first pushing part 1123 is closer to the developing roller axis of the developing roller 131 than the second pushing part 124. In the second direction, both the first pushing part 1123 and the second pushing part 124 are located between the developing roller axis and the driving axis. In this embodiment, the power receiving part 401 and the driving gear 402 can rotate relative to each other or can rotate synchronously.

[0064] As Figure 11 and Figure 12 shown, when the developing cartridge 1 is installed on the drum assembly 2, the first pushing part 1123 abuts against the first force - applying member 211. The first pushing part 1123 causes the first force - applying member 211 to move in a direction away from the photosensitive drum 23. The first elastic member is compressed and stores elastic force. The elastic force of the first elastic member is transmitted to the first pushing part 1123 through the first force - applying member 211, which is the first pushing force. The second pushing part 124 abuts against the second force - applying member 221. The second pushing part 1123 causes the second force - applying member 221 to move in a direction away from the photosensitive drum 23. The second elastic member is compressed and stores elastic force. The elastic force of the second elastic member is transmitted to the second pushing part 124 through the second force - applying member 221, which is the second pushing force. Both the first pushing force and the second pushing force are in the direction of the photosensitive drum 23, so that the cartridge body 10 always has a tendency to move towards the photosensitive drum 23, and further makes the developing roller 131 and the photosensitive drum 23 in close contact. Since the first pushing part 1123 is closer to the developing roller axis than the second pushing part 124 in the second direction, the first distance that the first pushing part 1123 causes the first force - applying member 211 to move is less than the second distance that the second pushing part 124 causes the second force - applying member 221 to move, that is, the compression amount of the first elastic member is less than the compression amount of the second elastic member, that is, the first pushing force received by the first pushing part 1123 is less than the second pushing force received by the second pushing part 124.

[0065] In this embodiment, by arranging the first pushing part 1123 and the second pushing part 121 one in front of the other, the pushing forces received by the two are inconsistent, and further the pushing forces received by the developing roller 131 are inconsistent, which can effectively solve or improve the color edge problem in the image formation of the image forming device and ensure the image formation quality of the image forming device.

[0066] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A developing cartridge, comprising: A cartridge body having a first end and a second end in a first direction and a third end and a fourth end in a second direction, the first direction and the second direction intersecting each other; A developing roller rotating about a developing roller axis extending in the first direction, the developing roller being located at the third end; A transmission assembly located at the first end and including a driving portion that receives external power and rotates about a driving axis extending in the first direction; A storage medium storing information of the developing cartridge; Characterized in that it further comprises a pushing assembly that receives an external acting force, and in the second direction, the pushing assembly is located between the developing roller axis and the driving axis.

2. The developing cartridge according to claim 1, wherein, The transmission assembly includes a rotating member that transmits power to the developing roller, the rotating member includes a first rotating portion and a second rotating portion arranged coaxially, the first rotating portion and the second rotating portion can rotate relatively, and there is a gap between the first rotating portion and the second rotating portion in the rotating direction of the rotating member.

3. The developing cartridge according to claim 2, wherein The first rotating portion includes a first engaging portion, the second rotating portion includes a second engaging portion, one of the first engaging portion and the second engaging portion is a protrusion extending in the first direction, and the other is a slot recessed in the first direction, and the first engaging portion is engaged with the second engaging portion so that the first engaging portion drives the second engaging portion to rotate.

4. The developing cartridge according to claim 3, characterized in that, In the rotating direction of the rotating member, the size of the slot is larger than the size of the protrusion.

5. The developing cartridge according to claim 3, wherein The rotating member is a driving portion, the first rotating portion is a power receiving portion, the first rotating portion receives external power and rotates, the second rotating portion is a driving gear, and the transmission assembly further includes a developing gear, and the developing gear meshes with the driving gear to receive power and rotate.

6. The developing cartridge according to claim 5, wherein The angle of rotation of the power receiving portion relative to the driving gear is 15° to 360°.

7. The developing cartridge according to claim 3, wherein, The rotating member is a developing gear, the second rotating portion is fixedly connected to the developing roller, and the first rotating portion receives the power transmitted by the driving portion and rotates to drive the second rotating portion to rotate.

8. The developing cartridge according to claim 2, wherein, It further includes a third rotating portion and a fourth rotating portion that can rotate relatively.

9. The developing cartridge according to claim 1, wherein The pushing assembly includes a first pushing portion located at the first end and a second pushing portion located at the second end. When observed along the first direction, at least part of the first pushing portion and the second pushing portion do not overlap.

10. The developing cartridge according to claim 9, characterized in that, In the second direction, the first pushing portion is closer to the developing roller axis than the second pushing portion.

11. The developing cartridge according to claim 10, wherein, The developing cartridge is detachably mounted on a drum assembly, the drum assembly applies a pushing force to the pushing assembly, and the first pushing force received by the first pushing portion is less than the pushing force received by the second pushing portion.

12. The developing cartridge according to claim 11, wherein, It further includes a first separating portion that receives a separating force to make the developing cartridge move against the first pushing force, the first separating portion is arranged at the first end, and in the second direction, the first separating portion is closer to the developing roller axis than the first pushing portion.

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