Developing box

Abstract

The utility model discloses a developing box, which can be detachably mounted on a drum box with a photosensitive drum, and comprises a shell, a first side, a second side, a first electrode, a second electrode, a third electrode, a fourth electrode, a fifth electrode and a sixth electrode, a developing roller; a coupling gear; a chip including an electrical contact surface; the bearing plate is used for supporting the rotatable developing roller, the bearing plate extends in a second direction to form a force receiving part, and the force receiving part can receive force outside the developing box to drive the developing roller to be close to the photosensitive drum; the force receiving portion is located between the rotation axis of the coupling gear and the electric contact surface in the second direction; the developing box disclosed by the utility model can effectively avoid the phenomenon that the forced and pushed bulges are abraded and damaged, so that the service life is prolonged, and the contact tightness between the photosensitive drum and the developing roller is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic photographic imaging, in particular to a developing box. Background Art

[0002] A developer cartridge is a consumable component used in electrophotographic imaging devices, such as printers. During use, the developer cartridge can be detachably mounted to the drum cartridge and, together with the drum cartridge, installed within the electrophotographic imaging device. Conventional developer cartridges include a drive gear, a powder feed roller, a developer roller, a stirring frame, and a storage chip. The drum cartridge includes a drum frame and a photosensitive drum. After the developer cartridge is installed, the developer roller in the developer cartridge contacts the drum, allowing the developer inside the cartridge to be transferred to the photosensitive drum, thereby developing the electrostatic latent image on the drum.

[0003] At the same time, the storage chip includes an electrical contact surface that is electrically connected to the internal electrical connection components of the electronic photographic imaging device. After the developer box is installed in the electronic photographic imaging device, the electrical contact surface maintains contact with the electrical connection components, so that the developer box and the electronic photographic imaging device establish a communication connection, and through this connection, the developer box can transmit the model, age and capacity life information of the developer box to the electronic photographic imaging device; on the one hand, such a setting requires a stable connection between the electrical contact surface and the electrical connection structure; on the other hand, during the transportation and use of the developer box shell, the forced push protrusion extending outward from the shell is at risk of being broken, and therefore, the structure of the existing developer box needs to be optimized. Utility Model Content

[0004] Therefore, the present invention provides a developing cartridge to solve the above technical problems, which is mainly achieved through the following technical solutions:

[0005] A developing cartridge capable of being detachably mounted on a drum cartridge having a photosensitive drum, the developing cartridge comprising:

[0006] a housing for accommodating a developer, the housing having a first side and a second side separately disposed in a first direction, and a third side and a fourth side separately disposed in a second direction intersecting the first direction;

[0007] a developing roller rotatable about a developing roller axis extending in the first direction, the developing roller being closer to the third side of the housing relative to the fourth side of the housing in the second direction;

[0008] a coupling gear having a coupling portion, the coupling gear being located on the first side of the housing in the first direction, the coupling portion being configured to receive a driving force from outside the developing cartridge and drive the developing roller to rotate;

[0009] a chip comprising an electrical contact surface, the electrical contact surface being located on the first side of the housing in the first direction;

[0010] a bearing plate, configured to rotatably support the developing roller, wherein the bearing plate extends a force receiving portion in the second direction, the force receiving portion being capable of receiving a force from outside the developing cartridge to drive the developing roller closer to the photosensitive drum;

[0011] The force receiving portion is located between the rotation axis of the coupling gear and the electrical contact surface in the second direction.

[0012] Furthermore, it also includes a chip frame for supporting the chip and the electrical contact surface; the chip frame is fixed to the first side of the shell or is integrally formed with the shell.

[0013] Furthermore, it also includes an agitator and an agitator gear for driving the agitator, and in the first direction, at least a portion of the forced protrusion overlaps with the gear portion of the agitator frame gear.

[0014] Furthermore, in the first direction, at least a portion of the forced pushing protrusion overlaps with the large gear portion of the stirring frame gear.

[0015] Furthermore, the force receiving portion is formed by extending from the bearing plate in the second direction.

[0016] Furthermore, an agitator and an agitator gear for driving the agitator; an intermediate connecting gear for transmitting driving force is provided between the coupling gear and the agitator gear; the end of the force receiving portion in the second direction is located between the rotation axis of the intermediate connecting gear and the electrical contact surface.

[0017] Furthermore, in a third direction intersecting the first direction and the second direction, the electrical contact surface, the coupling gear, and the forced pushing protrusion are arranged in sequence.

[0018] Furthermore, it further includes a second force receiving portion, wherein the force receiving portion is located on the first side of the shell in the first direction, and the second force receiving portion is located on the second side of the shell in the first direction.

[0019] Further, when viewed along the first direction, at least a portion of the force receiving portion and the second force receiving portion overlap.

[0020] Furthermore, in a third direction intersecting the first direction and the second direction, the electrical contact surface, the coupling gear, and the forced pushing protrusion are arranged in sequence.

[0021] Beneficial effects:

[0022] 1. The developer cartridge of the present invention can effectively reduce the wear and damage of the forced push protrusion, increase the service life, and ensure the tightness of the contact between the photosensitive drum and the developing roller.

[0023] 2. The forced pushing portion of the present invention is spaced apart from the electrical contact surface of the storage chip, thereby avoiding interference between the forced pushing portion and the electrical contact surface when the developing cartridge is installed on the drum cartridge and the imaging device and when the imaging device is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural diagram of the drum box in the utility model;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the developing cartridge in Example 1 of the present utility model;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the developing cartridge in Example 1 of the present utility model from another angle;

[0027] Figure 4 This is a schematic structural diagram of the right side of the developing cartridge in Example 1 of the present utility model;

[0028] Figure 5 1 is a schematic side cross-sectional view of the developing cartridge in the vertical direction in Example 1 of the present utility model;

[0029] Figure 6 This is a partially exploded schematic diagram of the left end portion of the developing cartridge in Example 1 of the present utility model;

[0030] Figure 7 This is a partially exploded schematic diagram of another angle of the left end portion of the developing cartridge in Example 1 of the present utility model;

[0031] Figure 8 This is a partially exploded schematic diagram of the left end portion of the developing cartridge in Example 1 of the present utility model at another angle;

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of the second forced-pushing protrusion in Example 1 of the present utility model;

[0033] Figure 10 It is a schematic diagram of the left side structure of the developing cartridge in Example 2 of the present utility model;

[0034] Figure 11 This is a schematic diagram of the right side structure of the developing cartridge in Example 2 of the present utility model;

[0035] Figure 12 This is a partially exploded schematic diagram of the left end portion of the developing cartridge in Example 2 of the present utility model;

[0036] Figure 13 This is a partially exploded schematic diagram of another angle of the left end portion of the developing cartridge in Example 2 of the present utility model;

[0037] Figure 14 This is a schematic diagram of the three-dimensional structure of the developing cartridge in Example 3 of the present utility model;

[0038] Figure 15 This is a partially exploded schematic diagram of the left end portion of the developing cartridge in Example 3 of the present utility model;

[0039] Figure 16 This is a schematic diagram of the left side position of the gear train and chip in Example 3 of the present utility model;

[0040] Figure 17 This is a schematic diagram of the position of the gear train and the chip at another angle in Example 3 of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and technical effect of the embodiment of the present invention more clear, the technical solution of the developer cartridge of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiment described is only a preferred embodiment of the present invention, not all embodiments. Based on the embodiment of the present invention, other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figure 1 As shown, a drum cartridge 50 in the prior art is shown; Figure 2 As shown, a developing box 100 is shown; the developing box 100 can be detachably installed inside the drum box 50, and the two can be installed together as a whole into an electronic photographic imaging device (hereinafter referred to as the "imaging device"). The drum box 50, the developing box 100 and the imaging device can cooperate with each other to complete the imaging operation.

[0044] like Figure 2-6 As shown, in the following description, when referring to the direction of the developing box 100, the axial direction of the developing roller 104 is the first direction (left-right direction), and the coupling gear 111 is located on the left side of the developing roller 104; the arrangement direction of the stirring frame axis and the developing roller axis is roughly the second direction (front-back direction), and the developing roller axis is located at the front end of the stirring frame axis; the third direction (up-down direction) is the direction intersecting the first direction and the second direction.

[0045] 1. Drum box

[0046] like Figure 1As shown, a drum cartridge 50 is shown, which can accommodate a developer cartridge 100 and is installed to an imaging device together with the developer cartridge 100 to perform imaging operations. The drum cartridge 50 includes a drum frame 51 for accommodating the developer cartridge 100, and a photosensitive drum 52 rotatably supported at the front end portion in the front-to-back direction of the drum frame 51; the left end of the photosensitive drum 52 is connected to a photosensitive drum gear, and after the drum cartridge 50 is installed to the imaging device, the photosensitive drum gear of the drum cartridge 50 is engaged with the drum drive gear (not shown) of the imaging device to receive the driving force of the imaging device and drive the photosensitive drum 52 to rotate around the photosensitive drum axis extending in the left-right direction; the drum frame 51 includes a locking member 54, and the locking member 54 includes a locking portion and a lifting portion. The locking portion is closer to the upper side of the drum frame 51 relative to the lifting portion, and the locking member 54 can rotate around an axis provided between the locking portion and the lifting portion, wherein the locking portion is used to prevent The developer box 100 is blocked from moving to lock the developer box 100 inside the drum box 50, so as to prevent the developer box 100 from being separated from the drum box 50 due to external force after the developer box 100 is installed in the drum box 50; the lifting portion can push the developer box 100 upward when the developer box 100 and the drum box 50 are detached, so that the developer box 100 is separated from the drum box 50 to release the lock with the drum box 50; the drum box 50 is also provided with a storage unit (not shown) and a drum electrical contact surface (not shown) for connecting the storage unit (not shown) to the imaging device. When the drum box 50 is installed in the imaging device, the drum electrical contact surface can be electrically contacted with the electrical contacts of the imaging device, so that the drum box 50 and the imaging device establish a communication link.

[0047] The interior of the drum box 50 also includes a pushing portion 55 for applying a pushing force to the forced pushing protrusion 120 in the developing box 100. When the developing box 100 is installed to the imaging device, the forced pushing protrusion 120 contacts the pushing portion 55, so that the pushing portion 55 applies a pushing force to the forced pushing protrusion 120 to make the developing box 104 contact the photosensitive drum 52.

[0048] 2. Developer box

[0049] like Figure 2-8As shown, a developing cartridge 100 in Example 1 of the present invention is shown. The developing cartridge 100 can be detachably installed in the above-mentioned drum cartridge 50 and can be installed in an imaging device together with the drum cartridge 50 to complete an imaging operation. The developing cartridge 100 includes a housing 101, the housing 101 includes a powder bin 101a for accommodating developer and an end cover 101b detachably installed on the left side of the powder bin 101a; the end cover 101b can cover at least part of the gear system in the developing cartridge 100, the gear system includes but is not limited to a coupling gear 111, a stirring frame gear 112, a powder feeding roller gear 113, a developing roller gear 114 and a plurality of connecting gears. The coupling gear 111 is arranged on the left side of the housing 101, and the coupling gear 111 has a coupling portion 111a and a gear portion 111b. When the developing cartridge 100 is installed with the drum cartridge 50, the coupling portion 111a can be connected to a driving member (not shown) of the imaging device to receive the driving force of the imaging device to drive the coupling gear 111 to rotate around a driving gear axis extending in the left-right direction. The coupling gear 111 is engaged with the powder feeding roller gear 113 and the developing roller gear 114, so that the coupling gear 111 can drive the powder feeding roller gear 113 and the developing roller gear 114 to rotate. The coupling gear 111 is engaged with the stirring frame gear 112 through the idler gear 115 to transmit driving force to the stirring frame gear 112, thereby driving the coupling gear 111 to rotate. The developing box 100 also includes a developing roller 104, a powder feeding roller 103 and a stirring frame 102 supported on the shell 101. The left ends of the developing roller 104, the powder feeding roller 103 and the stirring frame 102 are respectively connected to the developing roller gear 114, the powder feeding roller gear 113 and the stirring frame gear 112, so that each gear can respectively drive the developing roller 104, the powder feeding roller 103 and the stirring frame 102 to rotate around their respective axes extending in the left and right directions; the developing roller 104 is arranged at the front end of the shell 101 in the front-to-back direction. When the developing box 100 is installed on the drum box 50, the developing roller 104 can contact the photosensitive drum 52. During the operation of the developing box 100, the coupling gear 111 is connected to the driving member of the imaging device to receive the imaging device The driving force drives the stirring frame 102, the powder feeding roller 103 and the developing roller 104 to rotate respectively. The stirring frame 102 stirs the developer inside the shell 101 and feeds the developer to the powder feeding roller 103. The powder feeding roller 103 continues to stir the developer and feeds it to the developing roller 104. The developing roller 104 feeds the developer on it to the photosensitive drum 52 through its contact with the photosensitive drum 52 to develop the electrostatic latent image on the photosensitive drum 52; the developing box 100 also includes an electrode 105, and the electrode 105 has an electrical connection part. The electrical connection part can be connected to the power supply device of the imaging device to receive the power provided by the imaging device and transmit the power to the developing roller 104 and the powder feeding roller 103, thereby ensuring the smooth transportation of the developer.

[0050] The developer cartridge 100 further includes a chip holder 170 and a chip 180 supported by the chip holder 170. The chip holder 170 is located on the left side of the housing 101 in the left-right direction and is closer to the rear side of the housing 101 than the front side of the housing 101 in the front-back direction. Preferably, in this embodiment, the chip holder 170 is movable relative to the housing 101. Alternatively, in other embodiments, the chip holder 170 is fixedly mounted on one side of the housing 101 or extends outward from one side of the housing 101. The chip 180 includes a storage portion (not shown) and an electrical contact surface 181. The storage portion stores information such as the model of the developer cartridge 100. The storage portion is electrically connected to the electrical contact surface 181, which can contact an electrical contact point (not shown) of an imaging device and electrically connect to the imaging device, thereby establishing a communication link between the developer cartridge 100 and the imaging device. When the service life of the developer cartridge 100 is about to expire, the imaging device can prompt the user to replace the developer cartridge 100 with a new one through an operation panel or an indicator light.

[0051] In order to achieve close contact between the developing roller 104 in the developing box 100 and the photosensitive drum 52 in the drum box 50, forced pushing protrusions 120 extending in the left and right directions are also provided on both sides of the shell 101 in the developing box 100; when viewed from the left and right directions, at least a part of the forced pushing protrusions 120 located on the left and right sides of the shell 101 overlap.

[0052] Specifically, a first forced push protrusion 120R extends from the right side of the powder bin 101a in the shell 101 in the left-right direction; a second forced push protrusion 120L extends from the left side of the powder bin 101a in the left-right direction; when viewed from the left-right direction, the first forced push protrusion 120R and the second forced push protrusion 120L at least partially overlap.

[0053] In order to describe the position of the forced pushing protrusion 120 on the developer cartridge 100, the position of the forced pushing protrusion 120 is specifically described below by taking the second forced pushing protrusion 120L provided on the left side of the shell 101 as an example; in the up-down direction, the second forced pushing protrusion 120L is located below the electrical contact surface 181 and the coupling gear 111, and the second forced pushing protrusion 120L is spaced apart from the electrical contact surface 181 and the coupling gear 111 in the up-down direction; in the front-to-back direction, the second forced pushing protrusion 120L is closer to the developing roller 104 than the electrical contact surface 181, and the coupling gear 111, The second forced pushing protrusion 120L and the electrical contact surface 181 are arranged in sequence in the front-to-back direction; the forced pushing protrusion 120L extends in the left-right direction. In order to ensure the contact between the second forced pushing protrusion 120L and the forced pushing portion 55 in the drum box 50, the second forced pushing protrusion 120L at least partially overlaps with the gear portion of the stirring frame gear 112 in the left-right direction. While realizing the miniaturization of the developing box 100, it avoids the situation where the forced pushing protrusion 120 interferes with the electrical connection between the electrical contact surface 181 and the electrical contact head when the developing box 100 is installed on the drum box 50 and the imaging device.

[0054] Optionally, the developing box 100 also includes a detected protrusion and a counting gear for transmitting driving force to the detected protrusion. Specifically, the stirring frame gear 112 includes a large gear portion 112a for engaging with the idler gear 115 and a small gear portion 112b for engaging with the counting gear. In the left and right directions, the second forced pushing protrusion 120L at least partially overlaps with the large gear portion 112a.

[0055] like Figure 9 As shown, further, the second forced-pushing protrusion 120L includes a first protrusion 121 and a second protrusion 122 interconnected with the first protrusion 121, and the first protrusion 121 and the second protrusion 122 both protrude from the left side of the powder bin 101a, and the second forced-pushing protrusion 120L is configured to move the developing box 100 toward the direction of the photosensitive drum 52 of the drum box 50 under the action of external force, so that the developing roller 104 contacts the photosensitive drum 52 of the drum box 50.

[0056] When the developer cartridge 100 is installed to the drum cartridge 50, the external force is applied to the second forced pushing protrusion 120L by the pushing portion 55, so that the developer cartridge 100 can be moved in the direction close to the drum cartridge 50 to ensure the stability of the contact between the developing roller 104 and the photosensitive drum 52 of the drum cartridge 50, thereby improving the effect of electrostatic latent image transfer. Since the second forced pushing protrusion 120L includes a first protrusion 121 and a second protrusion 122 interconnected with the first protrusion 121, the first protrusion 121 extends in the left and right directions and in the up and down directions roughly perpendicular to the moving direction of the developer cartridge 100, and the second protrusion 122 extends in the left and right directions and in the front and back directions roughly parallel to the moving direction of the developer cartridge 100; the second protrusion 122 can effectively enhance the mechanical strength of the first protrusion 121, so that when an external force is applied to the first protrusion 121, the second forced pushing protrusion 120 can be effectively avoided from being worn and damaged, thereby improving the service life and ensuring the tightness of the contact between the photosensitive drum 52 and the developer roller 104.

[0057] Example 2:

[0058] Next, we will combine the Figure 10-13 Embodiment 2 of the present invention is described in detail. Embodiment 2 provides a developing box. The similarities between the developing box of this embodiment and the developing box in the above-mentioned embodiment 1 will not be repeated in this embodiment. The difference is that the shell 201 of the developing box 200 also includes a bearing plate 201d, and the bearing plate 201d is also provided with a forced thrust portion 230 for receiving a forced thrust force.

[0059] Specifically, the bearing plate 201d is located between the end cover 201b and the main body 201a in the left-right direction, and the developing roller 204 and the powder feeding roller 203 are rotatably supported in the main body 201a by the bearing plate 201d, and transport the developer to the photosensitive drum 52 in the drum box 50. The bearing plate 201d includes a plurality of through holes, and the roller shafts of the developing roller 204 and the powder feeding roller 203 pass through the through holes, so that the developing roller 204 and the powder feeding roller 203 are supported. The developing roller gear 213 and the powder feeding roller gear 214 are respectively installed on the roller shafts of the developing roller 204 and the powder feeding roller 203. The developing box 200 includes a stirring frame 202 for stirring the developer inside the main body 201a, and a stirring frame gear 212 for driving the stirring frame 202; when the developing box 200 is installed to the imaging device The driving gear 211 is connected to the driving member (not shown) in the imaging device to receive the driving force of the imaging device; the stirring frame gear 212 is connected to the driving gear 211 through the idler gear 215 to receive the driving force of the driving gear 211 to drive the stirring frame 202 to rotate, so that the stirring frame 202 stirs the developer inside the main body 201a and at the same time transports the developer to the powder feeding roller 203; the developing roller gear 213 and the powder feeding roller gear 214 are both engaged with the driving gear 211 to receive the driving force of the driving gear 211, thereby driving the developing roller 204 and the powder feeding roller 202 to rotate respectively, and the powder feeding roller 202 enables the powder feeding roller 203 to transport the developer to the developing roller 204, and the developing roller 204 rotates to transfer the developer to the photosensitive drum 52 of the drum box 50, thereby developing the electrostatic latent image on the photosensitive drum 52.

[0060] The forced pushing portion 230 is integrally formed with the main body of the bearing plate 201d and extends generally in the front-to-back direction. This provides the forced pushing portion 230 with sufficient strength to withstand the pushing force applied by the pushing portion 55 in the drum cartridge 50, thereby maintaining contact between the developing roller 204 and the photosensitive drum 52 in the drum cartridge 50. This effectively reduces wear and damage to the forced pushing portion 230, improves its service life, and ensures tight contact between the photosensitive drum 52 and the developing roller 204. Furthermore, the forced pushing portion 230 no longer extends outward from one side of the main body 201a, simplifying the structure of the main body 201a and reducing the difficulty in manufacturing the main body 201a. Furthermore, the bearing plate 201d is much smaller than the main body 201a, resulting in a lower production cost for the bearing plate 201d than for the main body 201a. With the same yield rate, the overall manufacturing cost of the developing cartridge 200 can be effectively reduced.

[0061] The developing cartridge 200 further includes a storage chip 280 and a chip rack 270 for supporting the storage chip 280; the storage chip 280 and the chip rack 270 are disposed on the left side of the housing 201; specifically, the chip rack 270 is mounted on the left side of the end cover 201b, the storage chip 280 is located on the top of the chip rack 270 in the vertical direction, and the storage chip 280 has an exposed electrical contact surface 281, which can be connected to an electrical connector (not shown) in the imaging device to establish a communication link between the developing cartridge 200 and the imaging device; in the front-to-back direction, the forced pushing portion 230 is located on the developing roller 2 04 and the electrical contact surface 281, and the forced pushing portion 230 is spaced apart from the electrical contact surface 281 in the front-to-back direction. In the up-down direction, the forced pushing portion 230 is located below the storage chip 280 and the chip rack 270, and the forced pushing portion 230 is spaced apart from the storage chip 280 and the chip rack 270 in the up-down direction; in the left-right direction, the forced pushing portion 230 and the electrical contact surface 281 are arranged opposite to each other on the left and right sides of the end cover 201b; this avoids mutual interference between the forced pushing portion 230 and the electrical contact surface 281 when the developing box 200 is installed to the drum box 50 and the imaging device.

[0062] Example 3:

[0063] Next, we will combine the Figure 14-17 The third embodiment of the present invention is described in detail. This embodiment provides a developer cartridge. The similarities between this embodiment and the developer cartridges of the first and second embodiments are not further described. The difference lies in that a forced push portion 420 extends outwardly from both sides of the housing 401 in the left and right directions. The forced push portion 420 is configured to cause the developer cartridge to move toward the drum assembly under the action of an external force, thereby bringing the developer roller 21 into contact with the photosensitive drum of the drum assembly. Specifically, the forced push portion 420 extends outwardly from both sides of the powder hopper 401a in the left and right directions. On the right side of the powder hopper 401a, the forced push portion 420 includes a first protrusion 421 and a second protrusion 422 interconnected with the first protrusion 421. The first protrusion 421 is used to generate the forced push force of the forced push portion 55 in the drum cartridge 50 to push the developer cartridge 100 toward the photosensitive drum 52. The second protrusion 422 extends in the front-to-back direction to effectively enhance the mechanical strength of the first protrusion 421.

[0064] On the other hand, printers are constantly pursuing miniaturization, making it difficult to accommodate larger gear trains. Therefore, this embodiment provides a developer cartridge 400, which includes a chip 480 connected to the left side of an end cap 401 via a chip holder 480. Chip 480 includes a storage portion (not shown) and an electrical contact surface 481. The storage portion stores information about the model, age, and maximum print volume of the developer cartridge 400. Electrical contact surface 481 can establish a communication link with an imaging device, allowing the imaging device to identify the developer cartridge 400. Compared with the prior art, this helps reduce the size of the gear train and the space occupied by the gear train, facilitating the trend toward miniaturization of printers.

[0065] The gear train includes a drive gear 411, a developing roller gear 414, and a powder feed roller gear 413. The drive gear 411 is rotatably connected to the left side of the powder hopper 401a. The developing roller gear 414 is sleeved on the outer surface of the developing roller 404, and the powder feed roller gear 413 is sleeved on the outer surface of the powder feed roller 403. The developing roller gear 414 and the powder feed roller gear 413 are respectively meshed with the drive gear 411. The gear train also includes a connecting gear 415 and an agitator gear 412. The connecting gear 415 is rotatably connected to the left side of the powder hopper 401a. The connecting gear 415 includes a first gear portion 415a and a second gear portion 415b, which are axially connected in sequence. The second gear portion 415b meshes with the drive gear 411. The connecting gear 415 is a double gear, with the first gear portion 415a closer to the powder hopper 401a and the second gear portion 415b farther away from the powder hopper 401a. The diameter of the second gear portion 415b is larger than that of the first gear portion 415a. The stirring frame gear 412 includes a third gear portion 412a and a fourth gear portion 412b. The stirring frame gear 412 is sleeved on the outer surface of the end portion of the stirring frame 402. The third gear portion 412a and the first gear portion 415a are engaged with each other. The outer diameter of the third gear portion 412a is larger than the outer diameter of the fourth gear portion 412b. The third gear portion 412a faces the powder bin 401a, and the fourth gear portion 412b faces away from the powder bin 401a.

[0066] In one implementation of the present embodiment, in the left-right direction, the first protrusion 421, the third gear portion 412a and the electrical contact surface 481 are arranged in sequence, and the distance between the free end of the first protrusion 421 away from the powder bin 401a and the left end face of the main body 401 is less than or equal to the distance between the end face of the third gear portion 412a facing the powder bin 401a and the left end face of the main body 401; so as to avoid interference between the components when the developing box 400 is in use.

[0067] In another embodiment of this embodiment, the projection of the second protrusion 422 on the powder bin 401a extends in the front-to-back direction; the chip 480 and its electrical contact surface 481, the drive gear 411, the developer roller gear 414, the powder feed roller gear 413, the connecting gear 415, and the third gear portion 412a are all located on the same side of the second protrusion 422. When viewed in a left-right cross-section, the entire forced push portion 420 is located outside the addendum circle of the drive gear 411, the addendum circle of the developer roller gear 414, and the addendum circle of the connecting gear 415; and when viewed in a left-to-right direction, the electrical contact surface 481 is located outside the addendum circle of the drive gear 411, the addendum circle of the developer roller gear 414, the tooth circle of the connecting gear 415, and the projection of the forced push portion 420.

[0068] In another embodiment of this embodiment, on the right side of the shell 401, the second protrusion 422 extends to the locked protrusion 406, so that the first protrusion 421, the second protrusion 422 and the locking protrusion 406 are formed as one piece to enhance the mechanical strength of the first protrusion 421 and the locking protrusion 406.

[0069] Functions and beneficial effects:

[0070] 1. The developer cartridge of the present invention can effectively reduce the wear and damage of the forced push protrusion, increase the service life, and ensure the tightness of the contact between the photosensitive drum and the developing roller.

[0071] 2. The forced pushing portion of the present invention is spaced apart from the electrical contact surface of the storage chip, thereby avoiding interference between the forced pushing portion and the electrical contact surface when the developing cartridge is installed on the drum cartridge and the imaging device and when the imaging device is used.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A developing cartridge capable of being detachably mounted on a drum cartridge having a photosensitive drum, the developing cartridge comprising: a housing for accommodating a developer, the housing having a first side and a second side separately disposed in a first direction, and a third side and a fourth side separately disposed in a second direction intersecting the first direction; a developing roller rotatable about a developing roller axis extending in the first direction, the developing roller being closer to the third side of the housing relative to the fourth side of the housing in the second direction; a coupling gear having a coupling portion, the coupling gear being located on the first side of the housing in the first direction, the coupling portion being configured to receive a driving force from outside the developing cartridge and drive the developing roller to rotate; a chip comprising an electrical contact surface, the electrical contact surface being located on the first side of the housing in the first direction; It is characterized by further comprising: a bearing plate for rotatably supporting the developing roller, wherein the bearing plate extends a force receiving portion in the second direction, and the force receiving portion can receive a force from outside the developing cartridge to drive the developing roller closer to the photosensitive drum; The force receiving portion is located between the rotation axis of the coupling gear and the electrical contact surface in the second direction.

2. The developing cartridge according to claim 1, wherein It also includes a chip frame for supporting the chip and the electrical contact surface; the chip frame is fixed to the first side of the housing or is integrally formed with the housing.

3. The developing cartridge according to claim 1, wherein: The invention further includes a stirring frame and a stirring frame gear for driving the stirring frame, wherein at least a portion of the force receiving portion overlaps with a gear portion of the stirring frame gear in the first direction.

4. The developing cartridge according to claim 3, wherein: At least a portion of the force receiving portion overlaps with the large gear portion of the stirring frame gear in the first direction.

5. The developing cartridge according to claim 1, wherein The force receiving portion is formed to extend from the bearing plate in the second direction.

6. The developing cartridge according to claim 1, wherein: It also includes a stirring frame and a stirring frame gear for driving the stirring frame; an intermediate connecting gear for transmitting driving force is provided between the coupling gear and the stirring frame gear; the end of the force receiving portion in the second direction is located between the rotation axis of the intermediate connecting gear and the electrical contact surface.

7. The developing cartridge according to claim 1, wherein: In a third direction intersecting the first direction and the second direction, the electrical contact surface, the coupling gear, and the force receiving portion are arranged in sequence.

8. The developing cartridge according to claim 1, wherein: A second force receiving portion is further included. The force receiving portion is located on the first side of the housing in the first direction, and the second force receiving portion is located on the second side of the housing in the first direction.

9. The developing cartridge according to claim 8, wherein: When viewed along the first direction, at least a portion of the force receiving portion and the second force receiving portion overlap.

10. The developing cartridge according to claim 8, wherein In a third direction intersecting the first direction and the second direction, the electrical contact surface, the coupling gear, and the second force receiving portion are arranged in sequence.

Images