A developing cartridge

Abstract

A developing cartridge includes a cartridge body, a developing roller rotatable about a first axis extending in a first direction, disposed at a third end, the developing roller coaxially fixedly provided with a developing gear at a first end, a powder feeding roller rotatable about a second axis extending in the first direction, the powder feeding roller coaxially fixedly provided with a powder feeding gear at the first end, a drive portion rotatable about a drive axis extending in the first direction, capable of receiving a driving force from an outside, disposed at the first end, a first thrust portion capable of receiving a thrust force from the outside, at least partially located between the first axis and the drive axis in a second direction, a storage medium including an electrical contact surface disposed at the first end, a first idler and a second idler rotatable about a third axis extending in the first direction, and the first idler engages with the drive portion, the developing gear engages with the first idler through the second idler, and the powder feeding gear engages with the drive portion.

Description

Technical Field

[0001] This utility model relates to the field of electronic imaging technology, specifically to a developing cartridge. Background Technology

[0002] The developing cartridge is a detachable component widely used in image forming apparatuses. It includes a developing roller and a toner delivery roller. Image forming apparatuses typically have four developing cartridges corresponding to the four photosensitive drums. Each developing cartridge contains a different color of developer. The developing roller contacts the photosensitive drum and transfers the toner to it, allowing the image forming apparatus to use various colors of toner for imaging, meeting more printing needs. The developing cartridge receives driving force from the image forming apparatus through a transmission assembly to drive the developing roller and toner delivery roller to rotate. However, the existing transmission assembly has an unreasonable design and low transmission stability. Utility Model Content

[0003] To solve at least one of the above-mentioned technical problems, the present invention provides a developing cartridge, which includes:

[0004] The box has a first end and a second end that are arranged opposite to each other in a first direction, a third end and a fourth end that are arranged opposite to each other in a second direction, and a fifth end and a sixth end that are arranged opposite to each other in a third direction.

[0005] The developing roller is rotatable about a first axis extending in a first direction and is disposed at the third end. A developing gear is coaxially fixed at the first end of the developing roller.

[0006] The powder feeding roller is capable of rotating about a second axis extending along a first direction, and a powder feeding gear is coaxially fixed at the first end of the powder feeding roller.

[0007] The drive unit, which is rotatable about a drive axis extending in a first direction and capable of receiving driving force from the outside, is disposed at the first end.

[0008] The first thrust section is capable of receiving thrust from the outside, and in the second direction, the first thrust section is at least partially located between the first axis and the drive axis;

[0009] A storage medium, including an electrical contact surface disposed at a first end;

[0010] A first idler wheel and a second idler wheel rotating about a third axis extending along a first direction; and

[0011] The first idler gear meshes with the drive unit, the developing gear meshes with the first idler gear via the second idler gear, and the powder feeding gear meshes with the drive unit.

[0012] The design of the first and second idler wheels in this invention enables the transmission assembly to operate smoothly, thereby improving the performance of the developing cartridge.

[0013] In some implementations, the first idler wheel rotates about the second axis, and there is no power transmission between the powder feeding gear and the first idler wheel;

[0014] In the first direction, the powder feeding gear is located between the first idler gear and the first end, or the first idler gear is located between the powder feeding gear and the first end.

[0015] In some embodiments, the powder feeding gear is located between the first idler gear and the first end, and the powder feeding gear is provided with a first cylinder. In a first direction, the first cylinder is farther away from the first end than the powder feeding gear, and the first idler gear is rotatably sleeved on the first cylinder.

[0016] In some embodiments, in the first direction, the length of the first cylinder is H1, and the length of the first idler wheel is less than or equal to H1;

[0017] The value of H1 is in the range of 4mm ≤ H1 ≤ 6mm.

[0018] In some embodiments, the second idler wheel is provided with a second cylinder, which enables the second idler wheel to avoid the powder feeding gear.

[0019] In some embodiments, the length of the powder feeding gear in the first direction is H2, and the length of the second cylinder in the first direction is greater than or equal to H2;

[0020] The value of H2 is in the range of 2mm ≤ H2 ≤ 4mm.

[0021] In some embodiments, a first idler wheel is located between the powder feeding gear and the first end. The powder feeding gear or the first end is provided with a first cylinder. In a first direction, the first cylinder is closer to the first end than the powder feeding gear. The first idler wheel is rotatably sleeved on the first cylinder.

[0022] In some embodiments, the first idler wheel rotates about a fourth axis extending along a first direction, the fourth axis not coinciding with the second axis;

[0023] In the second direction, the distance between the third axis and the first axis is the first distance A1, and the distance between the fourth axis and the first axis is the second distance A2;

[0024] The first distance A1 has a range of values ​​that satisfy 3.5mm < A1 < 7.6mm;

[0025] The range of the second distance A2 is 10.8mm < A2 < 14.5mm.

[0026] In some implementations, in the third direction, the distance between the third axis and the first axis is the third distance D1, and the distance between the fourth axis and the first axis is the fourth distance D2;

[0027] The value range of the third distance D1 satisfies 5.6mm < D1 < 8.7mm;

[0028] The range of the fourth distance D2 is 4.4mm < D2 < 10.6mm.

[0029] In some implementations, the first idler wheel and the second idler wheel have the same outer diameter and the same number of teeth. Attached Figure Description

[0030] Figure 1 This is a first-view perspective perspective view of the drum assembly in Embodiment 1 of this utility model;

[0031] Figure 2 This is a second-view perspective perspective view of the drum assembly in Embodiment 1 of this utility model;

[0032] Figure 3 This is a partial third-view perspective view of the drum assembly in Embodiment 1 of this utility model;

[0033] Figure 4 This is a perspective view of the developing cartridge in Embodiment 1 of this utility model;

[0034] Figure 5 This is a perspective view of the first protective cover of the developing cartridge in Embodiment 1 of this utility model;

[0035] Figure 6 This is an exploded schematic diagram of the first protective cover of the developing cartridge in Embodiment 1 of this utility model;

[0036] Figure 7 This is a perspective view of the second end of the developing cartridge in Embodiment 1 of this utility model;

[0037] Figure 8 This is a three-dimensional schematic diagram of the first end of the developing cartridge in Embodiment 1 of this utility model;

[0038] Figure 9 This is a schematic cross-sectional view of the developing cartridge in Embodiment 1 of this utility model;

[0039] Figure 10 This is an exploded view of the first end of the developing cartridge in Embodiment 1 of this utility model;

[0040] Figure 11 This is a schematic diagram of the developer cartridge drive assembly configuration method A according to Embodiment 1 of this utility model;

[0041] Figure 12 This is a schematic diagram of the developer cartridge drive assembly configuration method B in Embodiment 1 of this utility model;

[0042] Figure 13 This is a schematic diagram of the developer cartridge drive assembly configuration method C according to Embodiment 1 of this utility model;

[0043] Figure 14 This is a three-dimensional cross-sectional view of the developing cassette and drum assembly in embodiment A of this utility model.

[0044] Figure 15 This is a three-dimensional cross-sectional view of the developing cassette and drum assembly in embodiment C of this utility model.

[0045] Figure 16 This is a three-dimensional schematic diagram of the first end of the developing cartridge in Embodiment 2 of this utility model;

[0046] Figure 17 This is a schematic diagram of the first end explosion in Embodiment 2 of this utility model;

[0047] Figure 18 This is a three-dimensional schematic diagram of the first end from another perspective in Embodiment 2 of this utility model;

[0048] Figure 19 This is a partial three-dimensional schematic diagram of Embodiment 2 of this utility model;

[0049] Figure 20 This is a partial three-dimensional schematic diagram of a modified embodiment of the present invention, which is a second embodiment of the present invention.

[0050] Figure label:

[0051] 1. Developing cartridge; 10. Cartridge body; 100. Receiving cavity; 101. Partition wall; 11. First end; 111. First cover; 1121. First guided part; 1122. First pushing part; 1123. Separator; 113. Storage medium; 1131. Electrical contact surface; 114. First support; 115. Second support; 12. Second end; 1241. Second guided part; 129. Conductive steel sheet; 13. Third end; 131. Developing roller; 14. Fourth end; 15. Fifth end; 16. Sixth end; 40. Drive unit; 401. Power receiving unit; 402. Drive gear; 41. Developing gear; 42. Powder feeding gear; 421. First cylinder; 43. First idler wheel; 44. Second idler wheel; 441. Second cylinder;

[0052] 2. Drum assembly; 21. First sidewall; 211. First guide rail; 212. First force-applying component; 22. Second sidewall; 221. Second guide rail; 222. Second force-applying component; 223. First conductive part; 224. Second conductive part; 23. Photosensitive drum; 24. Separation rod;

[0053] L1, first horizontal line; A1, first distance; A2, second distance; D1, third distance; D2, fourth distance. Detailed Implementation

[0054] The present invention 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 of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0055] 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 utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation" should be interpreted broadly. For example, "installation" and "connection" can refer to fixed connections or movable connections, and "fixation" can refer to non-removable fixed connections or detachable fixed connections. A "non-removable fixed connection" can be formed separately and then installed, or it can be directly integrally formed; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] In this utility model, unless otherwise explicitly 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.

[0058] 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 the present invention. 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.

[0059] Example 1

[0060] like Figures 1-7 As shown, this embodiment provides a developing cartridge 1, which is detachably mounted on the drum assembly 2 of the image forming apparatus. The image forming apparatus is provided with a separation output component, and the drum assembly 2 is used to carry the developing cartridge 1.

[0061] like Figures 1-3 As shown, the drum assembly 2 includes a first sidewall 21, a second sidewall 22, and a photosensitive drum 23. The photosensitive drum 23 is rotatably supported by the first sidewall 21 and the second sidewall 22. The photosensitive drum 23 receives developer provided by the developing cartridge 1 to form an electrostatic latent image. A first guide rail 211 is provided at the first sidewall 21, and a second guide rail 221 is provided at the second sidewall 22. Both the first guide rail 211 and the second guide rail 221 have arc-shaped openings to guide the developing cartridge 1 to be smoothly installed into the drum assembly 2. The drum assembly 2 also includes a first force-applying member 212 located near the first sidewall 21 and a second force-applying member 222 located near the second sidewall 22. The first force-applying member 212 and the second force-applying member 222 are symmetrically arranged in a first direction and are movable relative to the photosensitive drum 23. The drum assembly 2 is also provided with a separation rod 24 near the first side wall. The separation rod 24 can move relative to the drum assembly 2. Specifically, the separation rod 24 can receive the force applied by the separation force output member on the image forming apparatus, and thus, while displacing relative to the drum assembly 2, it applies a separation force to the developing cartridge, forcing the developing roller on the developing cartridge 1 to separate from the photosensitive drum 23.

[0062] The drum assembly 2 also includes a first conductive part 223 and a second conductive part 224. The first conductive part 223 is fixedly disposed with the second force-applying member 212 and can move relative to the drum assembly 2 together with the second force-applying member 212. The first conductive part 223 can transmit voltage to the developing cartridge 1. The second conductive part 224 is disposed at the second side wall 22 of the drum assembly 2. The second conductive part 224 can introduce power supply voltage (image forming apparatus voltage) to the drum assembly 2. Specifically, the second conductive part 224 is electrically connected to the first conductive part 223, and the second conductive part 224 can introduce power supply voltage into the developing cartridge 1 through the first conductive part 223.

[0063] like Figures 4-10 As shown, the developing cartridge 1 includes a cartridge body 10, a developing assembly, a transmission assembly, a separator, and an identification assembly.

[0064] The housing 10 has a receiving cavity for containing developer, see [reference]. Figure 4 The box body 10 has a first end 11 that is relatively disposed in the first direction (corresponding to) Figure 4 (right direction in the middle) and the second end 12 (corresponding to) Figure 4 (in the left direction); the box 10 has a third end 13 (corresponding to) set opposite to it in the second direction. Figure 4 (in the forward direction) and the fourth end 14 (corresponding to) Figure 4 (The rear direction in the middle); see also Figure 4 , Figure 7 and Figure 8 The box body 10 has a fifth end 15 positioned in the third direction (corresponding to...). Figure 8 (upward direction) and the sixth end 16 (corresponding to) Figure 8 (in the lower direction). The cartridge 10 has a friction part (not shown in the figure) on its fifth end 15. The friction part has multiple ribs extending along the first direction. The friction part is used to facilitate the user to pick up the developing cartridge 1. The transmission assembly is located at the first end 11 of the cartridge 10 and is used to receive the power output from the image forming apparatus to drive the developing assembly in the developing cartridge 1. The first cover 111 is detachably fixed to the first end 11 of the cartridge 10 by means of screws. The first cover 111 covers at least part of the transmission assembly and is used to protect the transmission assembly.

[0065] The identification component is located at the first end 11 of the housing 10. In this application, the identification component is specifically a storage medium 113. The storage medium 113 is used to store information of the developing cartridge 1. When the developing cartridge 1 is installed in the image forming apparatus, the information is transmitted to the image forming apparatus, so that the developing cartridge 1 can be identified by the image forming apparatus. The storage medium 113 includes an electrical contact surface 1131 integrally formed therewith or separately combined with it. The electrical contact surface 1131 can be electrically connected to the image forming apparatus, specifically to an electrical contact pin on the image forming apparatus, so that the developing cartridge information in the storage medium 131 can be identified by the image forming apparatus.

[0066] The storage medium 113 is located behind the fourth end 14 of the housing 10 in the second direction. Specifically, the electrical contact surface 1131 has a first horizontal line L1, which is a horizontal line formed by connecting the electrical contact surface 1131 and the point where the image forming apparatus is electrically connected. In the second direction, the first horizontal line L1 is located behind the fourth end 14 of the housing 10. Alternatively, in other embodiments, the first horizontal line L1 on the electrolytic contact surface 1131 coincides with the fourth end 14 of the housing 10. That is, in the second direction, the relationship between the first distance between the fourth end 14 and the third end 13 and the second distance between the electrolytic contact surface 1131 and the third end 13 is that the first distance is less than or equal to the second distance. When the first distance is less than the second distance, the first horizontal line L1 is located behind the fourth end 14; when the first distance is equal to the second distance, the first horizontal line L1 coincides with the fourth end 14.

[0067] The storage medium 113 is fixedly mounted on the first bracket 114, and the second bracket 115 is provided at the first end 11 of the box body 10. Specifically, the second bracket 115 is integrally formed with the first cover 111, and the first bracket 114 is snapped onto the second bracket 115 by means of a snap fastener.

[0068] In other embodiments, the first bracket 114 may be omitted, and the storage medium 113 may be directly fixed on the second bracket 115.

[0069] The developing assembly includes a developing roller 131 and a powder feed roller (not shown in the figure), both of which are rotatably mounted in a receiving cavity between a first end 11 and a second end 12. The developing roller 131 rotates about a first axis extending in a first direction, and the powder feed roller rotates about a second axis extending in the first direction. The powder feed roller 132 is disposed adjacent to the developing roller 131, and in the second direction, the developing roller 131 is closer to the third end 13 of the cartridge 10 than the powder feed roller. The developing roller 131 is used to contact the photosensitive drum 23 to transfer developer to the photosensitive drum 23. The developing assembly also includes a powder exit blade (not shown in the figure), which extends in the first direction and is used to contact the developing roller 131 to control the thickness of the developer layer on the developing roller 131.

[0070] The developing cartridge 1 also includes a guided portion and a pushing portion. The guided portion facilitates the smooth installation of the developing cartridge 1 onto the drum assembly 2. The guided portion includes a first guided portion 1121 and a second guided portion 1241. The first guided portion 1121 is located at a first end 11, and the second guided portion 1241 is located at a second end 12. Preferably, the first guided portion 1121 is integrally formed with the first cover 111. In other embodiments, it can also be separately provided from the first cover 111. The first guided portion 1121 is arc-shaped and is guided by the first guide rail 211 to facilitate the installation of the developing cartridge 1. When the developing cartridge 1 is installed onto the drum assembly 2, the pushing part is abutted by the force-applying component so that the developing cartridge 1 receives the pushing force applied by the drum assembly 2, making the developing roller 131 in close contact with the photosensitive drum 23. The pushing part includes a first pushing part 1122 located at the first end 11. The first pushing part 1122 is abutted by the first force-applying member 212 to receive the pushing force applied to the first end 11. The developing cartridge 1 is also provided with a cartridge force-applying member (not shown in the figure) at the second end 12. The cartridge force-applying member can cooperate with the drum assembly 2 to apply a pushing force to the second end 12. In the second direction, the first pushing part 1122 is at least partially located between the first axis and the drive axis (the description of the drive axis is below). The developing cartridge 1 also includes a separating member 1123, which is a protrusion protruding in the first direction. The separating member 1123 can receive the separating force applied by the separating rod 24 on the drum assembly 2. In this application, the first guided part 1121, the first pushing part 1122, and the separating part 1123 can be integrally formed to reduce the number of parts, or they can be set separately. The specific setting method is limited according to the environment in which the developing cartridge is used.

[0071] A transmission assembly is disposed at the first end 11 of the housing 10. The transmission assembly includes a drive unit 40, which rotates about a drive axis extending in a first direction. The drive unit 40 includes a power receiving unit 401 and a drive gear 402, which can be integrally formed or combined. In the first direction, the drive gear 402 is closer to the housing 10 than the power receiving unit 401. In this embodiment, the power receiving unit 401 and the drive gear 402 are integrally formed. The power receiving unit 401 receives the power output from the image forming apparatus, thereby driving the drive gear 402 to rotate and transmitting driving force.

[0072] The transmission assembly also includes a developing gear 41, a powder feeding gear 42, a first idler gear 43, and a second idler gear 44. The developing gear 41 is located at the first end of the developing roller 131, and the powder feeding gear 42 is located at the first end of the powder feeding roller. The powder feeding gear 42 directly meshes with the drive gear 402 to receive the driving force from the drive unit 40 and thus drive the powder feeding roller to rotate. The first idler gear 43 directly meshes with the drive gear 402, and the second idler gear 44 meshes with both the developing gear 41 and the first idler gear 43. That is, the developing gear 41 receives the driving force from the drive unit 40 through the first idler gear 43 and the second idler gear 44 and thus drives the developing roller 131 to rotate. There is no driving force transmission between the powder feeding gear 42 and the developing gear 41.

[0073] In this embodiment, the cartridge 10 has a receiving cavity 100 for containing developer. The developing cavity 100 has a partition wall 101, which divides the receiving cavity 100 into a cavity for containing developer and a developing cavity for containing developing roller 131 and powder feeding roller. The developing cartridge 1 also has a conductive steel sheet 129, which is disposed at the second end 12 of the developing cartridge 1 and is used to transmit the voltage on the power supply electrode to the developing cartridge 1. In the first direction, the projections of the driving part 40, the partition wall 101 and the conductive steel sheet 129 do not overlap with each other.

[0074] In this embodiment, the partition wall 101 also serves to reinforce the receiving cavity of the developing cartridge.

[0075] In this embodiment, in the second direction, the first idler wheel 43 and the second idler wheel 44 are located between the drive unit 40 and the developing gear 41. In the third direction, the first idler wheel 43, which directly meshes with the drive gear 402, is closer to the fifth end 15 of the developing cartridge 1 than the second idler wheel 44, which directly meshes with the developing gear 41. In other embodiments, the gears are arranged in different ways. The number and position of the idler wheels are set according to the specific usage environment of the developing cartridge. No further limitations are made here.

[0076] like Figure 10 As shown, a transmission assembly is disposed at the first end 11 of the housing. The transmission assembly includes a drive unit 40, which receives the driving force of the image forming apparatus. The drive unit 40 includes a power receiving unit 401 and a drive gear 402, which can be integrally formed or combined. In a first direction, the drive gear 402 is closer to the housing than the power receiving unit 401. In this embodiment, the power receiving unit 401 and the drive gear 402 are integrally formed. The power receiving unit 401 receives the power output from the image forming apparatus, thereby driving the drive gear 402 to rotate and transmitting the driving force.

[0077] The transmission assembly also includes a developing gear 41, a powder feeding gear 42, a first idler gear 43, and a second idler gear 44. The developing gear 41 is coaxially fixedly mounted on 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 coaxially fixedly mounted on one end of the powder feeding roller located at the first end 11 and drives the powder feeding roller 132 to rotate. The second idler gear 44 rotates about a third axis extending along a first direction. The second idler gear 44 meshes with the developing gear 41 and the first idler gear 43. The first idler gear 43 rotates about a fourth axis extending along a first direction. The first idler gear 43 meshes with the second idler gear 44 and the drive gear 402. That is, the drive gear 402 transmits driving force to the developing gear 41 through the first idler gear 43 and the second idler gear 44 to drive the developing roller 131. At the same time, the developing gear 42 directly meshes with the drive gear 402 to drive the powder feeding roller.

[0078] like Figures 11-15 As shown, with the rotation axis of the developing roller 131 as a reference, the following are defined: in the second direction, the distance from the rotation axis (third axis) of the second idler wheel 44 to the rotation axis (first axis) of the developing roller 131 is the first distance A1; the distance from the rotation axis (fourth axis) of the first idler wheel 43 to the rotation axis (first axis) of the developing roller 131 in the second direction is the second distance A2; in the third direction, the distance between the rotation axis (third axis) of the second idler wheel 44 and the rotation axis (first axis) of the developing roller 131 is the third distance D1; and the distance from the rotation axis (fourth axis) of the first idler wheel 43 to the rotation axis (first axis) of the developing roller 131 in the third direction is the fourth distance D2.

[0079] When the drive gear 402 drives the developing gear 41 through the first idler gear 43 and the second idler gear 44, the reverse force on the developing gear 41 (i.e., the force that the drive gear 402 needs to overcome to drive the developing gear 41) corresponds to the torque required to drive the developing gear 41. In this scheme, the size and teeth of the first idler gear 43 and the second idler gear 44 are the same, that is, the structure of the first idler gear 43 and the second idler gear 44 is the same, which ensures that the transmission ratio is consistent. Therefore, the arrangement of the first idler gear 43 and the second idler gear 44 can affect the torque. When the torque is too large, it will cause the drive gear 401 to fail to drive, the image forming device to alarm, the first idler gear 43 and / or the second idler gear 44 to break teeth, or damage to the first idler gear 43 and / or the second idler gear 44, resulting in the inability to transmit power. Therefore, this scheme provides an explanation of the optimal position of the first idler gear 43 and the second idler gear 44.

[0080] like Figure 11 and Figure 14As shown, in transmission assembly configuration A, when the second idler wheel 44 is far from the sixth end 16 (the sixth end corresponds to the downward direction in the figure) and the first idler wheel 43 is close to the sixth end 16, the torque it possesses is minimal. Specifically, when the first distance A1 is 3.5mm; the second distance A2 is 10.8mm; the third distance D1 is 8.7mm; and the fourth distance D2 is 4.4mm, the torque transmitted from the first idler wheel 43 and the second idler wheel 44 to the drive gear 402 is minimal. Simultaneously, as... Figure 18 As shown, at this distance, when the developing cartridge 1 is installed on the drum assembly 2, the second idler wheel 44 will interfere with the photosensitive drum 23. After installation, the interference will disappear, which will affect the installation process of the developing cartridge 1, making the installation difficult and affecting customer use.

[0081] like Figure 12 As shown, this is the transmission component setup B. When the second idler wheel 44 is close to the sixth end 16 and the first idler wheel 43 is far from the sixth end 16, the torque on it is at its maximum, and the second idler wheel 44 will not interfere with the photosensitive drum 23. Specifically, when the first distance A1 is 7.6mm, the second distance A2 is 14.5mm, the third distance D1 is 5.6mm, and the fourth distance D2 is 10.6mm, the torque transmitted from the first idler wheel 43 and the second idler wheel 44 to the drive gear 402 is at its maximum. Under this torque, the image forming device will trigger an alarm, and due to the excessive torque, problems such as tooth breakage of the first idler wheel 43 and / or the second idler wheel 44, gear displacement, etc., will occur, rendering it unusable.

[0082] In summary, the distance between the positions of the first idler wheel 43 and the second idler wheel 44 should satisfy the following ranges: 3.5mm < A1 < 7.6mm; 10.8mm < A2 < 14.5mm; 5.6mm < D1 < 8.7mm; 4.4mm < D2 < 10.6mm.

[0083] like Figure 13 , Figure 15 As shown, this is configuration C of the transmission assembly. In this configuration, the preferred distances between the rotation axis of the second idler wheel 44 and the rotation axis of the developing roller 131 in the second and third directions are: A1 = 5.1 mm; D1 = 7.9 mm. The preferred distances between the rotation axis of the first idler wheel 43 and the rotation axis of the developing roller 131 in the second and third directions are: A2 = 13.5 mm; D2 = 9.4 mm. At these distances, the torque is moderate, the image forming apparatus will not alarm, and the gears will not be damaged. Furthermore, at these distances, the second idler wheel 44 will not interfere with the photosensitive drum 23, and will not affect the installation of the developing cartridge 1 in the drum assembly 2.

[0084] Preferably, in this application, the optimal setting is only one of the settings. For different printer models, the alarm range is different. Even if it is not the optimal setting, it will not affect the use and can still achieve the above purpose, as long as it is within the above distance range. The specifics will not be elaborated here.

[0085] Example 2

[0086] like Figures 16-19 As shown, in this embodiment, the number of gears remains the same as in embodiment three. The only difference is that the first idler wheel 43 and the powder feeding gear 42 rotate coaxially, that is, the first idler wheel 43 rotates around the second axis. Everything else is exactly the same as in embodiment three.

[0087] like Figures 16-18 As shown, in this embodiment, the first idler wheel 43 rotates coaxially with the powder feeding gear 42, and there is no power transmission between the first idler wheel 43 and the powder feeding gear 42. Specifically, the powder feeding gear 42 has a first cylinder 421, which is a hollow columnar part with a D-shaped opening inside and a cylindrical shape outside. The powder feeding gear 421 is sleeved on the powder feeding roller through the D-shaped opening to drive the powder feeding roller. The first idler wheel 43 is sleeved on the powder feeding gear 42 through the first cylinder 421, and the first idler wheel 43 can rotate relative to the powder feeding gear 42.

[0088] In this embodiment, the first idler wheel 43 and the powder feeding gear 42 simultaneously mesh with the drive gear 402 to receive driving force. The powder feeding gear 42 drives the powder feeding roller to rotate through the D-shaped opening. The first idler wheel 43 rotates relative to the powder feeding gear 42 around the first cylinder 421. At the same time, the first idler wheel 43 can also transmit the driving force to the developing gear 41 through the second idler wheel 44 to drive the developing roller 131 to rotate. The second idler wheel 44 has a second cylinder 441, which makes the teeth of the second idler wheel 44 a certain distance from the first end 11 in the first direction, so as to avoid the teeth of the powder feeding gear 42.

[0089] Furthermore, in this embodiment, in the first direction, the first cylinder 421 is farther from the first end 11 than the powder feeding gear 42, and the second cylinder 441 is closer to the first end than the second idler wheel 44. That is, in the first direction, the powder feeding gear 42 is located between the first idler wheel 43 and the box body 100, and the second cylinder 441 avoids the powder feeding gear 42 to prevent the second idler wheel 44 from interfering with the powder feeding gear 42.

[0090] Furthermore, in other embodiments, the first idler wheel 43 is still coaxially arranged with the powder feeding gear 42, but in the first direction, the first idler wheel 43 can be located between the powder feeding gear 42 and the cartridge 100. Therefore, the first cylinder 421 can be omitted on the powder feeding gear 42, and the second cylinder 441 can also be omitted on the second idler wheel 44, which reduces the manufacturing cost of the developing cartridge 1. No further details are provided here.

[0091] No power transmission is provided between the first idler wheel 43 and the powder feeding gear 42, so that the transmission chains of the powder feeding roller and the developing roller are independent of each other and do not interfere with each other, thereby improving transmission stability. In other embodiments, the first idler wheel 43 and the powder feeding gear 42 can also be fixedly arranged coaxially.

[0092] like Figure 19 As shown, in this embodiment, in the first direction, the length of the first cylinder 421 is H1, the length of the powder feeding gear 42 is H2, and the length of the second cylinder 441 on the second idler wheel 44 in the first direction is preferably greater than or equal to the length H2 of the powder feeding gear 42, so as to avoid the powder feeding gear 42 and prevent interference between the gears when they rotate. In the first direction, the length of the first idler wheel 43 is preferably less than or equal to the length H1 of the first cylinder 421, so as to facilitate the first cylinder 421 supporting the first idler wheel 43. In other embodiments, the length of the idler wheel 43 can also be slightly greater than the length H1 of the first cylinder 421, as long as the first cylinder 421 can support the first idler wheel 43 and achieve stable transmission.

[0093] In this embodiment, the length H1 of the first cylinder 421 ranges from 4mm to 6mm, and the length H2 of the powder feeding gear 42 ranges from 2mm to 4mm. Preferably, the length H1 of the first cylinder 421 is 5mm, and the length H2 of the powder feeding gear 42 is 3mm. In other embodiments, different transmission sequences and corresponding dimensions can be set according to the volume of the developing cartridge 1.

[0094] like Figure 20 As shown, this is a variation of the present embodiment. In this embodiment, in the first direction, the first idler wheel 43 is located between the powder feeding gear 42 and the first end 11. That is, compared with the above-mentioned scheme of Embodiment 2, the order of the first idler wheel 43 and the powder feeding gear 42 is reversed. With this setting, there is no need to set the second cylinder 441 on the second idler wheel 44. The first idler wheel 43 can continue to be sleeved on the first cylinder 421, except that the first cylinder 421 extends toward the first end 11, or the first cylinder can be directly set on the first end 11, or the first idler wheel 43 and the powder feeding gear 42 are both sleeved on the powder feeding roller, except that the first idler wheel 43 and the powder feeding roller have no power transmission. This is just a different setting method, which is roughly similar to Embodiment 2. The specific details will not be elaborated here.

[0095] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, or the above technical solutions can be freely combined, including freely combining the technical features of the different embodiments described above. All of these fall within the protection scope of this utility model.

Claims

1. A developing cartridge, characterized in that, The developing cartridge includes: The box has a first end and a second end that are arranged opposite to each other in a first direction, a third end and a fourth end that are arranged opposite to each other in a second direction, and a fifth end and a sixth end that are arranged opposite to each other in a third direction. A developing roller, capable of rotating about a first axis extending in a first direction, is disposed at the third end, and a developing gear is coaxially fixedly disposed at the first end of the developing roller; The powder feeding roller is rotatable about a second axis extending along a first direction, and a powder feeding gear is coaxially fixed at the first end of the powder feeding roller; The drive unit, which is rotatable about a drive axis extending in a first direction and capable of receiving driving force from the outside, is disposed at the first end; The first thrust section is capable of receiving thrust from the outside, and in the second direction, the first thrust section is at least partially located between the first axis and the drive axis; A storage medium, including an electrical contact surface disposed at the first end; A first idler wheel and a second idler wheel rotating about a third axis extending along a first direction; and The first idler gear meshes with the drive unit, the developing gear meshes with the first idler gear via the second idler gear, and the powder feeding gear meshes with the drive unit.

2. The developing cartridge according to claim 1, characterized in that, The first idler wheel rotates around the second axis, and there is no power transmission between the powder feeding gear and the first idler wheel; In a first direction, the powder feeding gear is located between the first idler gear and the first end, or the first idler gear is located between the powder feeding gear and the first end.

3. The developing cartridge according to claim 2, characterized in that, The powder feeding gear is located between the first idler wheel and the first end. The powder feeding gear is provided with a first cylinder. In a first direction, the first cylinder is farther away from the first end than the powder feeding gear. The first idler wheel is rotatably sleeved on the first cylinder.

4. The developing cartridge according to claim 3, characterized in that, In the first direction, the length of the first cylinder is H1, and the length of the first idler wheel is less than or equal to H1; The value of H1 is in the range of 4mm ≤ H1 ≤ 6mm.

5. The developing cartridge according to claim 4, characterized in that, The second idler wheel is provided with a second cylinder, which enables the second idler wheel to avoid the powder feeding gear.

6. The developing cartridge according to claim 5, characterized in that, In the first direction, the length of the powder feeding gear is H2, and the length of the second cylinder in the first direction is greater than or equal to H2; The value of H2 is in the range of 2mm ≤ H2 ≤ 4mm.

7. The developing cartridge according to claim 2, characterized in that, The first idler wheel is located between the powder feeding gear and the first end. The powder feeding gear or the first end is provided with a first cylinder. In a first direction, the first cylinder is closer to the first end than the powder feeding gear. The first idler wheel is rotatably sleeved on the first cylinder.

8. The developing cartridge according to claim 1, characterized in that, The first idler wheel rotates about a fourth axis extending along a first direction, the fourth axis not coinciding with the second axis; In the second direction, the distance between the third axis and the first axis is a first distance A1, and the distance between the fourth axis and the first axis is a second distance A2; The first distance A1 has a value range that satisfies 3.5mm < A1 < 7.6mm; The value range of the second distance A2 is 10.8mm < A2 < 14.5mm.

9. The developing cartridge according to claim 8, characterized in that, In the third direction, the distance between the third axis and the first axis is the third distance D1, and the distance between the fourth axis and the first axis is the fourth distance D2; The value range of the third distance D1 satisfies 5.6mm < D1 < 8.7mm; The value range of the fourth distance D2 satisfies 4.4mm < D2 < 10.6mm.

10. The developing cartridge according to claim 9, characterized in that, The first idler wheel and the second idler wheel have the same outer diameter and the same number of teeth.

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