Developing box and drum box

Abstract

The utility model discloses a developing box which can be detachably mounted in a drum box with a pressing plate. The developing box comprises a shell, a developing part and a driving part, a developing roller; a coupling gear; a forced pushing protrusion which can receive an external force to force the developing roller to be close to the photosensitive drum of the drum box when the developing box is installed on the drum box; a chip having an electrical contact surface; a positioning protrusion located closer to a third side of the housing relative to a fourth side of the housing in the second direction; when the developing box is jointed with the drum box, the positioning bulge can be connected with an external force so as to limit the movement of the developing box relative to the drum box in the third direction; according to the utility model, the pressing plate respectively applies downward pushing force in the up-down direction to the positioning bulges which extend outwards in the left-right direction from the developing box, so as to resist the rotating torque M generated by the movement between the developing roller and the photosensitive drum in the imaging process of the developing box, thereby ensuring that in the imaging process, the rotating torque M is not influenced; and the connection stability between the developing box and the drum box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrophotographic imaging, in particular to a developing cartridge and a drum cartridge. Background Art

[0002] The processing cartridge is a consumable used in an electrophotographic imaging device. In the prior art, the processing cartridge is generally divided into a developing cartridge and a drum cartridge. When in use, the user first installs the developing cartridge into the drum cartridge, and then installs the two together into the electrophotographic imaging device for imaging operations. The drum cartridge includes a drum frame for accommodating the developing cartridge, and a photosensitive drum installed on the front side of the drum frame in the front-rear direction; a developing roller is provided on the front side of the developing cartridge in the front-rear direction; when the developing cartridge is installed into the drum cartridge, the photosensitive drum contacts the developing roller.

[0003] In the prior art, the drum cartridge restricts the developing cartridge inside the drum frame through a locking portion provided on one side and rear of the drum frame, so as to prevent the developing cartridge from falling off the drum cartridge. However, during the imaging process of the electrophotographic imaging device, the electrophotographic imaging device needs to supply driving force to the developing cartridge and the drum cartridge, so as to drive components such as the photosensitive drum, the developing roller, the powder feeding roller, and the stirring frame in the developing cartridge and the drum cartridge to rotate to complete the imaging operation. During the imaging process, the photosensitive drum and the developing roller are in contact with each other and their rotations are relative. When the photosensitive drum and the developing roller rotate relatively, a force is generated to make the developing cartridge tilt upward relative to the drum cartridge, so that the engagement between the developing cartridge and the drum cartridge becomes unstable, thereby affecting the imaging effect of the electrophotographic imaging device. Summary of the Utility Model

[0004] Therefore, the utility model provides a developing cartridge and a drum cartridge to solve the above technical problems, which are mainly realized through the following technical solutions:

[0005] A drum cartridge, comprising:

[0006] A photosensitive drum that can rotate around a photosensitive drum axis extending in a first direction;

[0007] A drum frame for rotatably supporting the photosensitive drum, and the drum frame can be used to accommodate the developing cartridge;

[0008] The drum frame has a first end portion and a second end portion separated from the first end portion in the first direction;

[0009] It further includes a pressing plate, and the pressing plate is disposed close to the photosensitive drum in a second direction intersecting with the first direction, and the pressing plate can move between a first position and a second position;

[0010] The first position of the pressing plate is configured as the position of the pressing plate when the developing cartridge is disengaged from the drum cartridge, and the second position of the pressing plate is configured as the position of the pressing plate when the developing cartridge is engaged with the drum cartridge.

[0011] Further, the pressing plate includes a shaft that extends substantially along the first direction, and the pressing plate rotates about the shaft from the first position to the second position.

[0012] Further, the pressing plate includes a force-receiving portion as a force-receiving point and a locking portion as a force-applying point;

[0013] In a third direction that intersects the first direction and the second direction, the force-receiving portion is located between the shaft and the locking portion.

[0014] Further, in a state where the developing cartridge is engaged with the drum cartridge, the force-receiving portion receives the force of the guiding portion of the developing cartridge, and the locking portion applies a force to the positioning protrusion of the developing cartridge.

[0015] Further, an elastic member is provided between the pressing plate and the drum frame bracket for forcing the pressing plate toward the first position.

[0016] The present utility model also provides a developing cartridge that can be detachably mounted to a drum cartridge, and the developing cartridge includes:

[0017] A housing for accommodating a developer, the housing having a first side in a first direction and a second side spaced from the first side, and the housing having a third side in a second direction and a fourth side spaced from the third side;

[0018] A developing roller that can rotate about a developing roller axis extending in the first direction, and the developing roller is located on the third side of the housing in the second direction;

[0019] A coupling gear that can rotate about the coupling gear axis extending in the first direction, and the coupling gear is used to receive a driving force from outside the developing cartridge;

[0020] A forced push protrusion that can receive an external force to force the developing roller close to the photosensitive drum of the drum cartridge when the developing cartridge is mounted to the drum cartridge;

[0021] A chip having an electrical contact surface, and the electrical contact surface is located on the first side of the housing in the first direction;

[0022] A positioning protrusion that is located closer to the third side of the housing than the fourth side of the housing in the second direction;

[0023] In a state where the developing cartridge is engaged with the drum cartridge, the positioning protrusion can receive an external force to restrict movement of the developing cartridge relative to the drum cartridge in a third direction that intersects the first direction and the second direction.

[0024] Further, in the second direction, there is a first distance between the coupling gear and the electrical contact surface, and a second distance between the electrical contact surface and the positioning protrusion;

[0025] wherein, the first distance is less than the second distance;

[0026] In the first direction, the electrical contact surface is closer to the fourth side relative to the third side.

[0027] Further, it further includes an end cap, and a through hole is provided on the end cap for exposing at least a part of the coupling gear on the first side of the housing in the first direction;

[0028] The positioning protrusion is configured as an outer wall of the through hole.

[0029] Further, all the positioning protrusions are located on the second side of the housing in all the first directions; the developing cartridge further includes an electrode for receiving power outside the developing cartridge;

[0030] The positioning protrusion is configured as at least a part of the electrode.

[0031] Further, it further includes a guiding protrusion that can cooperate with the drum frame to guide the installation of the developing cartridge onto the drum cartridge;

[0032] In the second direction, the positioning protrusion is farther from the third side of the housing than the guiding protrusion.

[0033] On both sides of the drum cartridge in the left - right direction, pressing plates extending in the front - back direction are respectively provided; positioning protrusions extending out on both sides of the developing cartridge in the left - right direction. In a state where the developing cartridge is engaged with the imaging device, the pressing plates respectively apply a downward thrust in the up - down direction to the positioning protrusions extending outward from the developing cartridge in the left - right direction to counter the rotational torque M generated by the relative movement between the developing roller and the photosensitive drum during the imaging process of the developing cartridge, thereby ensuring the stability of the connection between the developing cartridge and the drum cartridge during the imaging process. Additionally, in the front - back direction, the positioning protrusions and the electrical contact surface are disposed opposite to each other on both sides of the housing. When the developing cartridge is installed onto the drum cartridge, the positioning protrusions receive a downward thrust in the up - down direction from the pressing plates; at the same time, one side of the developing cartridge closer to the electrical contact surface in the front - back direction is subjected to the locking force of the locking portion, restricting the movement of the electrical contact surface relative to the drum cartridge; when the developing cartridge and the drum cartridge are installed onto the imaging device together, the connection between the electrical contact surface and the imaging device is more stable. Brief Description of the Drawings

[0034] Figure 1 is a perspective view of the developing cartridge of the present utility model;

[0035] Figure 2 is a perspective view of the developing cartridge of the present utility model from another angle;

[0036] Figure 3 is a vertical cross-sectional view of the developing cartridge of the present utility model;

[0037] Figure 4 is a perspective view of the left end of the developing cartridge of the present utility model;

[0038] Figure 5 is a partial exploded view of the end cap and the main body of the present utility model;

[0039] Figure 6 is a perspective view of the drum cartridge of the present utility model;

[0040] Figure 7 is a vertical cross-sectional view of the developing cartridge and the drum cartridge in the engaged state of the present utility model;

[0041] Figure 8 is a structural view of the left side of the drum cartridge of the present utility model;

[0042] Figure 9 is a structural view of the right side of the drum cartridge of the present utility model;

[0043] Figure 10 is a perspective view of the drum cartridge in the separated state of the developing cartridge and the drum cartridge of the present utility model;

[0044] Figure 11 is a perspective view of the drum cartridge from another angle in the separated state of the developing cartridge and the drum cartridge of the present utility model;

[0045] Figure 12 is a structural view of the left side of the two in the engaged state of the developing cartridge and the drum cartridge of the present utility model;

[0046] Figure 13 is a structural view of the right side of the two in the engaged state of the developing cartridge and the drum cartridge of the present utility model. Detailed Description of the Preferred Embodiment

[0047] To make the objectives, technical solutions, and technical effects of the embodiments of the present utility model clearer, the technical solutions of the processing cartridge of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only preferred embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model.

[0048] In the following description, when referring to the direction of the developing cartridge 100, the axial direction of the developing roller 120 is defined as the left-right direction (the first direction), and the end cap 112 is located on the left side of the developing roller 120 in the left-right direction; the front-back direction (the second direction) is defined as the arrangement direction of the axis of the developing roller and the axis of the stirring frame, and the developing roller 120 is located at the front end of the stirring frame 140 in the front-back direction; the up-down direction (the third direction) is the direction intersecting with the left-right direction and the front-back direction; preferably, the left-right direction, the front-back direction, and the up-down direction are perpendicular to each other.

[0049] As Figure 6 shown in the figure, a drum cartridge 50 is shown. The drum cartridge 50 can be installed together with the developing cartridge 100 into an electrophotographic imaging device (hereinafter referred to as "imaging device") for imaging operations. The drum cartridge 50 includes a drum frame 51, a photosensitive drum 52, a locking portion 54, and a pushing portion 55; the drum frame 51 is used to accommodate the developing cartridge 100, the photosensitive drum 52 is used to receive signals from the imaging device and form an electrostatic latent image, the photosensitive drum 52 is rotatably supported on the drum frame 51 around the photosensitive drum axis extending in the left-right direction, the pushing portion 55 is arranged at the rear part of the drum frame 51 in the front-back direction, and when the developing cartridge 100 is installed into the drum cartridge 50, the pushing portion 55 is used to apply a forward pushing force to the developing cartridge 100, so that the developing roller 120 contacts the photosensitive drum 52. The locking portion 54 is arranged at the rear in the front-back direction on the left side of the drum frame 51, and the locking portion 54 is used to apply a locking force to the rear in the front-back direction of the housing 110 to lock the developing cartridge 100 inside the drum frame 51, thereby preventing the developing cartridge 100 from falling off.

[0050] As Figures 8 - 9 shown in the figure, the drum cartridge 50 further includes a guiding groove for guiding the installation of the developing cartridge 100 to the installation position. The guiding groove includes a first guiding groove 56 and a second guiding groove 57. Specifically, the guiding groove extends in the front-back direction, the first guiding groove 56 is located on the left side of the drum frame 51, and the second guiding groove 57 is located on the right side of the drum frame 51.

[0051] As Figures 1 - 5As shown, a developing cartridge 100 of the present utility model is shown, which can be detachably installed into a drum cartridge 50, and the two can be installed into an imaging device as a whole. With the cooperation of the two, the imaging device can complete an imaging operation; the developing cartridge 100 includes a housing 110 as a main body part, and the housing 110 includes a powder bin 111 for accommodating a developer, and an end cover 112 detachably installed at the left end of the powder bin 111 in the left-right direction; the powder bin 111 includes a handle 111a for the user to hold conveniently; the end cover 112 can cover at least a part of the gear train located on one side of the powder bin 111. Preferably, in this embodiment, the above-mentioned gear train and the end cover 112 are located on the left side of the powder bin 111 in the left-right direction. As Figure 5 shown, the gear train includes, but is not limited to, an input gear 150 for receiving the driving force from the imaging device, a developing roller gear 121, a powder feeding roller gear 131, and a stirring frame gear 141; the input gear 150 can mesh with the developing roller gear 121 and the powder feeding roller gear 131, and the input gear 150 can drive the developing roller gear 121 and the powder feeding roller gear 131 to rotate; the input gear 150 meshes with the stirring frame gear 141 through an idler gear 151, so that the input gear 150 drives the stirring frame gear 141 to rotate through the idler gear 151. The developing cartridge 100 further includes a developing roller 120, a powder feeding roller 130, and a stirring frame 140. The left end parts of the developing roller 120, the powder feeding roller 130, and the stirring frame 140 are respectively connected to the developing roller gear 121, the powder feeding roller gear 131, and the stirring frame gear 141, and each gear drives the developing roller 120, the powder feeding roller 130, and the stirring frame 140 to rotate along their respective axes extending in the left-right direction.

[0052] The developing roller 120 is arranged at the front end of the housing 110 in the front-back direction. When the developing cartridge 100 is installed into the drum cartridge 50, the developing roller 120 contacts the photosensitive drum 52 in the drum cartridge 50; when the input gear 150 receives the driving force of the imaging device, the input gear 150 drives the developing roller 120, the powder feeding roller 130, and the stirring frame 140 to rotate respectively; the stirring frame 140 is used for stirring the developer inside the housing 110 and conveying the developer to the powder feeding roller 130, and the powder feeding roller 130 then conveys the developer to the developing roller 120, and the developing roller 120 transfers the developer onto the photosensitive drum 52 to develop the electrostatic latent image on the photosensitive drum 52. The developing cartridge 100 further includes a forced push protrusion 106. In the state where the developing cartridge 100 is installed into the drum cartridge 50, the forced push protrusion 106 can receive the forced pushing force of the forced pushing part 55 to make the developing roller 120 closely contact the photosensitive drum 52. A blade 117 is arranged between the developing roller 120 and the housing 110, and the blade 117 is used for controlling the thickness of the developer on the developing roller 120 to make the developer on the developing roller 120 more uniform, thereby improving the imaging quality of the developing cartridge 100.

[0053] Optionally, the gear train further includes a counting gear 171, which is meshed and connected with the stirring frame gear 141 and can rotate following the rotation of the stirring frame gear 141, and the counting gear 171 is constructed as a half-tooth gear structure; the developing box 100 also includes a transmission rod 172, an elastic member 173 and a toggle protrusion 170, the transmission rod 172 spans the left side and the right side of the shell 110 in the left and right directions, and the toggle protrusion 170 is arranged on the right side of the transmission rod 172, that is, the toggle protrusion The protrusion 170 is arranged on the right side of the shell 110, and a plurality of protrusions extend from the side of the counting gear 171 close to the powder bin 111 in the left-right direction. When the counting gear rotates, the protrusion applies a driving force to the right in the left-right direction to the transmission rod 172, and the elastic member 173 applies a force to the left in the left-right direction to the transmission rod 172. The setting of the protrusion and the elastic member 173 drives the protrusion 170 to move back and forth in the left-right direction to move the detection body (not shown) inside the imaging device to complete the counting.

[0054] The developer box 100 is also provided with an electrode 160, which includes an electrical contact portion exposed on the right side of the developer box 100. When the developer box 100 is installed in the imaging device, the electrical contact portion can be electrically connected to a power supply component (not shown) of the imaging device. The electrode 160 can be electrically connected to at least one of the developing roller 120, the powder feeding roller 130 and the powder discharge knife 117 through the electrical connection between the electrical contact portion and the power supply component. In the present embodiment, the electrical contact portion is electrically connected to the developing roller 120 and the powder feeding roller 130 to ensure that the developer can be stably transported.

[0055] like Figures 4 - 5 As shown, the developing box 100 includes a chip 220 for storing information of the developing box 100, and a chip frame 230 for supporting the chip 220; the chip frame 230 is installed on the left side of the housing 110, and specifically, the chip frame 230 is arranged on the left side of the end cover 112 in the left-right direction. Preferably, in this embodiment, a protective cover 113 is arranged on the left side of the end cover 112, and the protective cover has a groove extending in the up-down direction, and at least a part of the chip frame 230 is located in the groove, so that the chip frame 230 can be installed between the end cover 112 and the protective cover 113 in a movable manner relative to the end cover 112 in the up-down direction, so as to prevent the chip frame 230 from being separated from the developing box 100.

[0056] Optional, such as Figure 7As shown, in other embodiments, the chip holder 230 is fixedly installed on the left side of the end cap 112 in the left-right direction. Specifically, the chip holder 170 is fixedly connected to the left side of the end cap 112 by means of elastic buckles or screws. The chip holder 170 can also be formed by extending from the left side of the end cap 112 in the left-right direction from right to left. The chip holder 170 can also be formed by extending from the left side of the powder cartridge 111 in the left-right direction from right to left. The chip 220 is disposed in the mounting groove at the top of the chip holder 230 in the up-down direction and is exposed at the top of the chip holder 230.

[0057] The chip 220 includes an electrical contact surface 221. The electrical contact surface 221 is located on the left side of the housing 110 in the left-right direction. The chip 220 is disposed in the mounting groove at the top of the chip holder 230 in the up-down direction so that the electrical contact surface 221 is exposed at the top of the chip holder 230 in the up-down direction. The electrical contact surface 221 is arranged to face upward of the housing 110 in the up-down direction. In the left-right direction, the electrical contact surface 221 is closer to the rear side relative to the front side. After the developing cartridge 100 is installed in the imaging device, the electrical contact surface 221 is connected to the electrical contact member in the imaging device, so that a communication link is established between the chip 220 and the imaging device. The electrical contact surface 221 is composed of a plurality of contact terminals arranged in the left-right direction.

[0058] The developing cartridge 100 further includes guiding protrusions extending outward in the left-right direction from both sides of the housing 110. The guiding protrusions include a first guiding protrusion 310 located at the left end of the developing cartridge 100 and a second guiding protrusion 320 located at the right end of the developing cartridge 100. In this embodiment, the first guiding protrusion 310 and the second guiding protrusion 320 are coaxial with the developing roller 120. In other embodiments, the portion of the developing roller shaft extending to the left side of the housing 110 serves as the first guiding protrusion 310, and the portion of the developing roller shaft extending to the right side of the housing 110 serves as the second guiding protrusion 320.

[0059] The developing cartridge 100 further includes positioning protrusions extending in the left-right direction from both sides of the housing 110. The positioning protrusions include a first positioning protrusion provided on the left side of the developing cartridge 100 and a second positioning protrusion located on the right side of the developing cartridge 100. Specifically, in this embodiment, the end cap 112 includes a through hole 112a for exposing the input gear 150 on the left side of the housing 110. The left side of the end cap 112 includes a hole wall 330 of the through hole 112a extending in the left-right direction. In this embodiment, the hole wall 330 serves as the first positioning protrusion. A bearing plate for supporting the developing roller 120 and the powder feeding roller 130 is provided on the right side of the housing 110. The right side of the bearing plate includes a power connection protrusion 340 extending in the left-right direction and serving as the electrical contact portion of the electrode 160. In this embodiment, the power connection protrusion 340 serves as the second positioning protrusion.

[0060] As Figure 7As shown, when the developing cartridge 100 performs an imaging operation, the developing cartridge 100 is installed inside the drum cartridge 50. At this time, the developing roller 120 contacts the photosensitive drum 52 and rotates relatively simultaneously (as shown in the figure, the developing roller 120 rotates in the counterclockwise S direction, and the photosensitive drum 52 rotates in the clockwise R direction). In addition, the guiding protrusion coaxial with the developing roller 120 provided on the developing cartridge 100 is supported on the drum cartridge 50. In the vertical direction of the line L connecting the axes of the photosensitive drum 52 and the developing roller 120 (the tangential direction of the photosensitive drum 52 and the developing roller 120), the photosensitive drum 52 applies a downward frictional force F to the developing roller 120. Correspondingly, under the support of the guiding protrusion, a rotational torque M is generated on the developing cartridge 100. This rotational torque M forces the developing cartridge 100 to tilt upward in the downstream direction of the rotational torque M with the guiding protrusion as the fulcrum. The positioning protrusion on the developing cartridge 100 is farther from the front side of the housing 110 than the guiding protrusion in the forward direction. The force outside the positioning protrusion developing cartridge 100 overcomes the rotational torque M to prevent the developing cartridge 100 from tilting, improving the stability of the developing cartridge 100 and ensuring the imaging quality of the developing cartridge 100.

[0061] As Figure 6 shown, the guiding groove of the drum cartridge 50 includes an upper guide plate and a lower guide plate; in the up and down direction, the upper guide plate is located above the lower guide plate, and when the developing cartridge 100 is engaged with the drum cartridge 50, in the up and down direction, the upper guide plate is located above the positioning protrusion, and the upper guide plate at least partially coincides with the positioning protrusion in the front and back direction; specifically, the first guiding groove 56 includes a first upper guide plate 561 and a first lower guide plate 562, and the first upper guide plate 561 is located above the first lower guide plate 562 in the up and down direction. The second guiding groove 57 includes a second upper guide plate 571 and a second lower guide plate 572, and the second upper guide plate 571 is located above the second lower guide plate 572 in the up and down direction. When the developing cartridge 100 is engaged with the drum cartridge 50, in the up and down direction, the hole wall 330 is located between the first upper guide plate 561 and the first lower guide plate 562, and the power connection protrusion 340 is located between the second upper guide plate 571 and the second lower guide plate 572; in other words, when the developing cartridge 100 is installed in the drum cartridge 50, the hole wall 330 can contact the first upper guide plate 561 and receive the supporting force of the first upper guide plate 561 to limit the movement of the developing cartridge 100 relative to the drum cartridge 50 in the up and down direction; the power connection protrusion 340 can contact the second upper guide plate 571 and receive the supporting force of the second upper guide plate 571 to limit the movement of the developing cartridge 100 relative to the drum cartridge 50 in the up and down direction.

[0062] Furthermore, as Figure 10 and 12As shown, the first upper guide plate 561 is configured as a pressure plate rotatable relative to the drum frame 51. A first elastic member 563 is provided between the first upper guide plate 561 and the drum frame 51. The first upper guide plate 561 includes a first force-receiving end 561a for receiving an external thrust, a first pressing end 561b for applying a force to the hole wall 330, and a first rotating shaft 561c located between the first force-receiving end 561a and the first pressing end 561b in the up-down direction. In the up-down direction, the first force-receiving end 561a is located below the first pressing end 561b. The first elastic member 563 is configured as a tension spring for keeping the first upper guide plate 561 in a forward rotation tendency; as Figure 10 and Figure 12 shown, before the drum cartridge 50 is engaged with the developing cartridge 100, the first upper guide plate 561 rotates forward under the action of the first elastic member 563. At this time, the first upper guide plate 561 is in a first position, and the first position is configured to facilitate the entry of the first guiding protrusion 310 and the hole wall 330 into the first guiding groove 56. That is to say, the first position is the position of the first upper guide plate 561 when the developing cartridge 100 is separated from the drum cartridge 50. In use, the user places the developing cartridge 100 on the drum cartridge 50 from top to bottom. At this time, the first guiding protrusion 310 and the hole wall 330 of the developing cartridge 100 enter the first guiding groove 56. Subsequently, the user presses the developing cartridge 100 downward, so that the first guiding protrusion 310 moves forward from back to front in the front-rear direction along the first guiding groove 56. During the movement of the first guiding protrusion 310, the first guiding protrusion 310 contacts the first upper guide plate 561, and the first guiding protrusion 310 applies a forward thrust in the front-rear direction to the first force-receiving end 561a of the first upper guide plate 561 and pushes the first force-receiving end 561a forward, so that the first pressing end 561b of the first upper guide plate 561 rotates downward around the first rotating shaft 561c. At this time, the first upper guide plate 561 is in a second position, and the second position is configured such that the first pressing end 561b contacts the power connection protrusion 340 of the developing cartridge 100 and applies a downward thrust to the hole wall 310. In the second position, the developing cartridge 100 is fixed inside the drum cartridge 50. In the state where the developing cartridge 100 is installed inside the drum cartridge 50, the developing cartridge 100 is located in front of the pressing portion 55 in the front-rear direction. At this time, the pressing portion 55 applies a forward thrust to the forced pressing protrusion 106 of the developing cartridge 100 in the front-rear direction, so that the developing cartridge 100 has a tendency to move forward in the front-rear direction, and the first guiding protrusion 310 has a tendency to move forward in the front-rear direction together with the developing cartridge 100; thus, the first upper guide plate 561 continuously applies a forward thrust in the front-rear direction to the first force-receiving end 561a; to maintain the downward thrust applied by the first pressing end 561b to the hole wall 330, so that the engagement between the developing cartridge 100 and the drum cartridge 100 is more stable.

[0063] Similarly, as Figure 11 and 13As shown, the second upper guide plate 571 is configured as a pressing plate rotatable relative to the drum frame 51. A second elastic member 573 is provided between the second upper guide plate 571 and the drum frame 51. The second upper guide plate 571 includes a second force-receiving end 571a for receiving an external thrust, a second pressing end 571b for receiving the force applied by the power connection protrusion 340, and a second rotating shaft 571c located between the second force-receiving end 571a and the second pressing end 571b in the vertical direction. In the vertical direction, the second force-receiving end 571a is located below the second pressing end 571b; the second elastic member 573 is configured as a tension spring for keeping the second upper guide plate 571 in a forward rotation tendency; as Figure 11 and Figure 13 shown, before the drum cartridge 50 is engaged with the developing cartridge 100, the second upper guide plate 571 rotates forward under the action of the second elastic member 573. At this time, the second upper guide plate 571 is in the first position, and the first position is configured to facilitate the second guiding protrusion 320 and the power connection protrusion 340 to enter the second guiding groove 57. That is to say, the first position is the position of the second upper guide plate 571 when the developing cartridge 100 is separated from the drum cartridge 50; during use, the user places the developing cartridge 100 on the drum cartridge 50 from top to bottom. At this time, the second guiding protrusion 320 and the power connection protrusion 340 of the developing cartridge 100 enter the second guiding groove 57. Subsequently, the user presses the developing cartridge 100 downward, so that the second guiding protrusion 320 moves forward from back to front in the front-rear direction along the second guiding groove 57. During the movement of the second guiding protrusion 320, the second guiding protrusion 320 contacts the second upper guide plate 571, and the second guiding protrusion 320 applies a forward thrust in the front-rear direction to the second force-receiving end 571a of the second upper guide plate 571, and pushes the second force-receiving end 571a forward, so that the second pressing end 571b of the second upper guide plate 571 rotates downward around the second rotating shaft 571c. At this time, the second upper guide plate 571 is in the second position, and the second position is configured to make the second pressing end 571b contact the power connection protrusion 340 of the developing cartridge 100 and apply a downward thrust to the power connection protrusion 340. In the second position, the developing cartridge 100 is fixed inside the drum cartridge 50; in the state where the developing cartridge 100 is installed inside the drum cartridge 50, the developing cartridge 100 is located in front of the pressing portion 55 in the front-rear direction. At this time, the pressing portion 55 applies a forward thrust to the forced pressing protrusion 106 of the developing cartridge 100 in the front-rear direction, so that the developing cartridge 100 maintains a tendency to move forward in the front-rear direction, and the second guiding protrusion 320 has a tendency to move forward in the front-rear direction together with the developing cartridge 100; thus, the second upper guide plate 571 continuously applies a forward thrust in the front-rear direction to the second force-receiving end 571a; to maintain the downward thrust applied by the second pressing end 571b to the power connection protrusion 340, so as to make the engagement between the developing cartridge 100 and the drum cartridge 100 more stable.

[0064] Optionally, in this embodiment, the power connection protrusion 340 is integrally formed with the electrode 160; in other embodiments, the second positioning protrusion is separately provided from the electrode 160.

[0065] In addition, during the imaging operation of the developing cartridge 100 and the imaging device, the first upper guide plate 561 and the second upper guide plate 571 respectively apply a downward thrust in the up-and-down direction to the hole wall 330 and the power connection protrusion 340 extending outward in the left-and-right direction from the developing cartridge 100, so as to counteract the rotational torque M generated by the relative movement between the developing roller 120 and the photosensitive drum 52 during the imaging process of the developing cartridge 100, thereby ensuring the stability of the connection between the developing cartridge 100 and the drum cartridge 50 during the imaging process.

[0066] In the front-and-rear direction, the hole wall 330 serving as the positioning protrusion and the electrical contact surface 221 are disposed opposite to each other on both sides of the housing 110. When the developing cartridge 100 is installed on the drum cartridge 50, the hole wall 330 receives a downward thrust in the up-and-down direction from the first upper guide plate 561; at the same time, the side of the developing cartridge 100 close to the electrical contact surface 221 in the front-and-rear direction is subjected to the locking force of the locking portion 54, restricting the movement of the electrical contact surface 221 relative to the drum cartridge 50; when the developing cartridge 100 and the drum cartridge 50 are installed on the imaging device together, the connection between the electrical contact surface 221 and the imaging device is more stable.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drum box, comprising: A photosensitive drum rotatable about a photosensitive drum axis extending in a first direction; A drum frame, used for rotatably supporting the photosensitive drum, and the drum frame can be used to accommodate a developing box; The drum frame has a first end in the first direction and a second end separated from the first end; The method is characterized in that it further comprises a pressing plate, wherein the pressing plate is arranged close to the photosensitive drum in a second direction intersecting the first direction, and the pressing plate can move between a first position and a second position; The first position of the pressure plate is configured as the position of the pressure plate in a state where the developing cartridge is disengaged from the drum cartridge, and the second position of the pressure plate is configured as the position of the pressure plate in a state where the developing cartridge is engaged with the drum cartridge.

2. The drum cartridge according to claim 1, characterized in that The pressure plate includes a shaft extending generally in the first direction, and the pressure plate rotates about the shaft from the first position to the second position.

3. The drum cartridge according to claim 1, characterized in that The pressure plate includes a force-bearing portion as a force-bearing point, and a locking portion as a force-applying point; In a third direction intersecting the first direction and the second direction, the force receiving portion is located between the shaft and the locking portion.

4. The drum cartridge according to claim 3, characterized in that In a state where the developing cartridge is engaged with the drum cartridge, the force receiving portion receives a force of the guide portion of the developing cartridge, and the locking portion applies a force to the positioning protrusion of the developing cartridge.

5. The drum cartridge according to claim 1, characterized in that The pressing plate and the drum frame bracket are provided with elastic members for forcing the pressing plate to the first position.

6. A developing cartridge, which can be detachably mounted to the drum cartridge according to any one of claims 1 to 5, the developing cartridge comprising: A housing for containing developer, wherein the housing has a first side in a first direction and a second side spaced apart from the first side, and the housing has a third side in a second direction and a fourth side spaced apart from the third side; a developing roller rotatable about a developing roller axis extending in the first direction, the developing roller being located on the third side of the housing in the second direction; a coupling gear rotatable about the coupling gear axis extending in the first direction, the coupling gear being used to receive a driving force from the outside of the developing cartridge; a forced pushing protrusion, which can receive external force to force the developing roller to approach the photosensitive drum of the drum cartridge when the developing cartridge is installed to the drum cartridge; a chip having 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 positioning protrusion located closer to the third side of the housing relative to the fourth side of the housing in the second direction; When the developing cartridge is engaged with the drum cartridge, the positioning protrusion may receive an external force to limit movement of the developing cartridge relative to the drum cartridge in a third direction intersecting the first direction and the second direction.

7. The developing cartridge according to claim 6, wherein: In the second direction, there is a first distance between the coupling gear and the electrical contact surface, and there is a second distance between the electrical contact surface and the positioning protrusion; wherein the first distance is smaller than the second distance; In the first direction, the electrical contact surface is closer to the fourth side than to the third side.

8. The developing cartridge according to claim 6, wherein: Also included is an end cover, the end cover is provided with a through hole for exposing at least a portion of the coupling gear to the first side of the housing in the first direction; The positioning protrusion is configured as an outer hole wall of the through hole.

9. The developing cartridge according to claim 6, wherein: The positioning protrusion is located at the second side of the housing in the first direction; the developing box further includes an electrode, the electrode is used to receive power outside the developing box; The positioning protrusion is configured as at least a portion of the electrode.

10. The developing cartridge according to claim 6, wherein: Also included is a guide protrusion that can cooperate with the drum frame to guide the developer cartridge to be installed to the drum cartridge; In the second direction, the positioning protrusion is farther from the third side of the housing than the guide protrusion.

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