Developing box and drum box

Abstract

The utility model discloses a developing box, which can be detachably mounted in a drum box with a locking part, and comprises a shell used for accommodating a developing agent and provided with a first side and a second side arranged at an interval with the first side in a first direction; a developing roller; a coupling gear; a chip having an electrical contact surface; a locking protrusion located on a first side of the housing in a first direction; in a state in which the developing cartridge is engaged with the drum cartridge, the locking protrusion cooperates with the locking portion to restrict movement of the developing cartridge relative to the drum cartridge in the third direction; the electrical connection surface is located between the coupling gear and the locking protrusion in the second direction. In the second direction, a first distance is formed between the coupling gear and the electric contact surface, a second distance is formed between the electric contact surface and the locking protrusion, and the first distance is larger than the second distance; compared with the prior art, the locking mode provided by the utility model reduces the influence of the movement of the developing box in the front-back direction on the locking function.

Description

Technical Field

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

[0002] The processing box is a consumable material used in an electronic photographic imaging device. In the prior art, the processing box is generally divided into two parts: a developing box and a drum box. When in use, the user first installs the developing box into the drum box, and then installs the two together into the electronic photographic imaging device for imaging. The drum box includes a drum frame for accommodating the developing box, and a photosensitive drum installed on the front side of the drum frame in the front-to-back direction; a developing roller is provided on the front side of the developing box in the front-to-back direction; a pushing portion for applying a pushing force to the developing box to make the photosensitive drum contact the developing roller is provided inside the drum box, and a locking portion for locking the developing box inside the drum box, and the locking portion is located at the rear end of the drum box in the front-to-back direction.

[0003] In the prior art, the pushing portion applies a forward thrust to the developer box in the front-to-back direction so that the photosensitive drum and the developing roller contact each other; at the same time, after the developer box is installed to the drum box, the locking portion contacts the locking protrusion at the rear end of the developer box in the front-to-back direction so that the developer box is locked inside the drum box; in actual use, the developer box moves to the front end of the drum box under the push of the pushing portion, so that the contact area between the locking portion at the rear end of the drum box and the locking protrusion becomes smaller, thereby reducing the locking strength of the locking portion on the developer box, making it easy for the developer box to fall off from the drum box, which is not conducive to the imaging operation of the developer box. Utility Model Content

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

[0005] The utility model provides a developing box, which can be detachably installed in a drum box with a locking rod, and the developing box includes:

[0006] A housing for containing a 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;

[0007] A developing roller rotatable about a developing roller axis extending in a first direction, the developing roller being located on a third side of the housing in a second direction;

[0008] A coupling gear rotatable about a coupling gear axis extending in a first direction, the coupling gear being used to receive a driving force from the outside of the developing cartridge, the coupling gear being located at a first side of the housing in the first direction;

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

[0010] Locking protrusion;

[0011] When the developing cartridge is engaged with the drum cartridge, the locking protrusion cooperates with the locking lever to prevent the developing cartridge from being separated from the drum cartridge;

[0012] The electrical contact surface is located between the coupling gear and the locking protrusion in the second direction;

[0013] 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 locking protrusion, wherein the first distance is greater than the second distance.

[0014] Further, in the first direction, the locking protrusion is spaced apart from the electrical contact surface, and the electrical contact surface is farther away from the second side of the housing than the locking protrusion.

[0015] Further, the locking protrusion is closer to the fourth side of the housing relative to the third side of the housing in the second direction;

[0016] The housing further comprises an end cover, and the locking protrusion is located at a fourth side of the end cover in the second direction;

[0017] The locking protrusion is formed and extended from the rear side of the end cover in the second direction.

[0018] Further, when the developing cartridge is positioned such that: the developing cartridge is placed along the second direction as a horizontal direction and the electrical contact surface faces upward of the housing, the locking protrusion has a contact surface facing upward of the housing in a third direction, and the third direction intersects the first direction and the second direction;

[0019] The contact surface is formed to extend in the second direction.

[0020] The utility model also provides a drum box, comprising:

[0021] A photosensitive drum rotatable about a photosensitive drum axis extending in a first direction;

[0022] A drum frame, used for rotatably supporting the photosensitive drum, the drum frame can be used to accommodate the developing cartridge, the drum frame having a first end in a first direction and a second end separated from the first end, and the drum frame having a third end and a fourth end in a second direction intersecting the first direction;

[0023] a locking lever rotatable from a first position to a second position about a first axis intersecting the first direction;

[0024] The first position of the locking lever is configured as a position where the locking lever restricts movement of the developing cartridge in a third direction, and the second position of the locking lever is configured as a position where the developing cartridge can move relative to the locked lever in a third direction, the third direction intersecting the first direction and the second direction.

[0025] Furthermore, it also includes a driving rod, which can receive a force from the outside of the drum box and move relative to the drum frame, and the locking rod can move from the first position to the second position according to the movement of the driving rod.

[0026] Further, the driving rod comprises a force-bearing portion for receiving external force, a force-applying portion for transmitting the driving force to the locking rod, and a rotating pivot, and the rotating pivot is located between the force-bearing portion and the force-applying portion in the third direction.

[0027] Further, the locking rod comprises a shaft, the shaft substantially extends along the second direction, and the locking rod rotates around the shaft from the first position to the second position.

[0028] Furthermore, the locking rod includes a force-bearing portion as a force-bearing point and a locking portion as a force-applying point. In the third direction, the force-bearing portion is located between the shaft and the locking portion.

[0029] When the developing box and the drum box are engaged, the locking rod is located below the locking protrusion, and the contact surface between the limiting protrusion and the locking part extends in the front-to-back direction, thereby increasing the contact area between the locking part and the locking protrusion; compared with the prior art, the locking method of the utility model reduces the influence of the movement of the developing box in the front-to-back direction on the locking function. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the developing box of the utility model;

[0031] Figure 2 It is a three-dimensional structural schematic diagram of the developing box of the utility model from another angle;

[0032] Figure 3 It is a cross-sectional view of the developing box of the utility model in the vertical direction;

[0033] Figure 4 It is a structural schematic diagram of the left end portion of the developer cartridge of the utility model;

[0034] Figure 5 It is a structural schematic diagram of the left end portion of another embodiment of the developing cartridge of the utility model;

[0035] Figure 6 It is a partially exploded schematic diagram of the left end portion of the developer cartridge of the utility model;

[0036] Figure 7 It is a three-dimensional structural schematic diagram of the drum box of the utility model;

[0037] Figure 8 It is a three-dimensional structural schematic diagram of the drum box of the utility model from another angle;

[0038] Fig. 9 This utility model Figure 7 Middle A: Enlarged view;

[0039] Fig.10 It is an exploded schematic diagram of the locking assembly of the utility model;

[0040] Fig.11 It is a three-dimensional structural schematic diagram of the locking assembly of the utility model in the locked state;

[0041] Fig.12 It is a three-dimensional structural schematic diagram of the locking assembly of the utility model in the locked state from another angle;

[0042] Fig.13 It is a three-dimensional structural schematic diagram of the locking assembly of the utility model in the unlocked state;

[0043] Fig.14 It is a three-dimensional structural schematic diagram of the locking component of the utility model in the unlocked state from another angle. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and technical effect of the embodiment of the utility model clearer, the technical scheme of the processing box of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiment is only a preferred embodiment of the utility model, not all embodiments. Based on the embodiment of the utility model, other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the utility model.

[0045] In the following description, when referring to the direction of the developing box 100, the axial direction of the developing roller 120 is taken as the left-right direction (first direction), and the end cover 112 is located on the left side of the developing roller 120 in the left-right direction; the front-to-back direction (second direction) is defined as the arrangement direction of the developing roller axis and the stirring frame axis, and the developing roller 120 is located at the front end of the stirring frame 140 in the front-to-back direction; the up-and-down direction (third direction) is a direction intersecting the left-to-right direction and the front-to-back direction; preferably, the left-to-right direction, the front-to-back direction and the up-and-down direction are perpendicular to each other.

[0046] like Figure 7-9As shown in the figure, a drum cartridge 50 is shown, and the drum cartridge 50 includes a drum frame 51, a photosensitive drum 52, a locking assembly 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 a signal from an electrophotographic imaging device (hereinafter referred to as "imaging device") and form an electrostatic latent image, the photosensitive drum 52 can be rotatably supported on the drum frame 51 around a photosensitive drum axis extending in the left and right directions, and the pushing portion 55 is arranged at the rear of the drum frame 51. When the developing cartridge 100 is installed to 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 assembly 54 is arranged above one side of the drum frame 51. When the developing cartridge 100 is installed to the drum cartridge 50, the locking assembly 54 cooperates with the locking protrusion 410 of the developing cartridge 100 to lock the developing cartridge 100 inside the drum frame 51, thereby preventing the developing cartridge 100 from falling off.

[0047] like Figure 1-6 As shown, a developing box 100 of the utility model is shown, the developing box 100 can be installed in the drum box 50 in a detachable manner, and the two can be installed in the imaging device as a whole, and the imaging device can complete the imaging operation under the cooperation of the two; the developing box 100 includes a shell 110, the shell 110 has a left side and a right side spaced apart from the left side in the left-right direction, the shell 110 has a front side and a rear side spaced apart from the front side in the front-to-back direction, the shell 110 includes a powder bin 111 for accommodating the developer, the shell 110 includes an end cover 112 which can also be detachably installed on the left side of the powder bin 111 in the left-to-right direction; the powder bin 111 includes a handle 111a for the convenience of the user to hold; 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 the present 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-to-right direction. As shown Figure 5 As shown, the gear system includes but is not limited to a coupling gear 150 for receiving a driving force from the imaging device, a developing roller gear 121, a powder feeding roller gear 131 and a stirring frame gear 141; the coupling gear 150 can rotate around a coupling gear axis extending in the left-right direction, the coupling gear 150 can mesh with the developing roller gear 121 and the powder feeding roller gear 131, and the coupling gear 150 can drive the developing roller gear 121 and the powder feeding roller gear 131 to rotate; the coupling gear 150 meshes with the stirring frame gear 141 through the idler gear 151, so that the coupling gear 150 drives the stirring frame gear 141 to rotate through the idler gear 151. The developing box 100 also includes a developing roller 120, a powder feeding roller 130 and a stirring frame 140. The left ends 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 and right directions.

[0048] The developing roller 120 is arranged on the front side of the shell 110 in the front-to-back direction. The developing roller 120 can rotate around the developing roller axis extending in the left-right direction. When the developing box 100 is installed on the drum box 50, the developing roller 120 contacts the photosensitive drum 52 in the drum box 50; when the developing box 100 and the drum box 50 are installed together in the imaging device, the coupling gear 150 can be connected to the driving component inside the imaging device to receive the driving force of the imaging device, and the coupling gear 150 can respectively drive the developing roller 120, the powder feeding roller 130 and the stirring frame 140 to rotate to perform imaging operations; during the imaging operation, the stirring frame 140 is used to stir the developer inside the shell 110, and at the same time transport the developer to the powder feeding roller 130, and the powder feeding roller 130 then transports the developer to the developing roller 120, and the developing roller 120 transfers the developer it carries to the photosensitive drum 52 to develop the electrostatic latent image on the photosensitive drum 52. A powder knife 117 is provided between the developing roller 120 and the housing 110 . The powder knife 117 is used to control the thickness of the developer on the developing roller 120 , so that the developer on the developing roller 120 is more uniform, thereby improving the imaging quality of the developing box 100 .

[0049] 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.

[0050] The developing box 100 is also provided with an electrode 160, which includes an electrical contact portion arranged on the right side of the developing box 100. When the developing box 100 is installed on the drum box 50, the electrical contact portion can be electrically connected to a power supply component (not shown) inside 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.

[0051] The developer cartridge 100 further includes a guided protrusion 105 and a forced pushing protrusion 106. The guided protrusion 105 can cooperate with the guide groove 53 of the drum cartridge 50 to guide the developer cartridge 100 to be installed in a suitable position in the drum cartridge 50; when the developer cartridge 100 is installed in the drum cartridge 50, the forced pushing protrusion 106 can receive the forced pushing force of the forced pushing portion 55 to make the developer roller 120 in close contact with the photosensitive drum 52, and the guided protrusion 105 is formed by extending outward from both sides of the housing 101 in the left-right direction; when viewed in the left-right direction, the guided protrusion 105 overlaps at least a part of the developer roller 120 in the left-right direction, the guided protrusion 105 is located at the front side of the housing 110 in the front-to-back direction, and the forced pushing protrusion 106 is located at the rear side of the housing 110 in the front-to-back direction.

[0052] like Figure 4-5 As shown, the developing box 100 further 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 this embodiment, a protective cover 113 is arranged on the left side of the end cover 112, and the protective cover 113 has a groove extending in the up-down direction, and a part of the chip frame 230 is located in the groove, so that the chip frame 230 can move relative to the protective cover 112 in the up-down direction, and the chip frame 230 is installed between the protective cover 112 and the limiting bracket 113 to prevent the chip frame 230 from being separated from the developing box 100.

[0053] Optional, such as Figure 5 As shown, in other embodiments, the chip rack 230 is fixedly installed on the left side of the end cover 112 in the left-right direction. Specifically, the chip rack 170 is fixedly connected to the left side of the end cover 112 by elastic buckles or screws. The chip rack 170 can also be extended from the left side of the end cover 112 from right to left in the left-right direction. The chip rack 170 can also be extended from the left side of the powder bin 111 from right to left in the left-right direction.

[0054] The chip 220 includes an electrical contact surface 221, which is located on the left side of the shell 110 in the left-right direction. The chip 220 is arranged in a mounting groove at the top of the chip frame 230 in the up-down direction so that the electrical contact surface 221 is exposed to the top of the chip frame 230 in the up-down direction. The electrical contact surface 221 is arranged to face the top of the shell 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 developer box 100 is installed in the imaging device, the electrical contact surface 221 is connected to the electrical contact component in the imaging device, so that the chip 220 establishes a communication link with the imaging device.

[0055] The developer box 100 also includes a locking protrusion 410, which extends from the rear side of the shell 110 in the front-to-back direction. When the developer box 100 is installed to the drum box 50, the locking protrusion 410 is used to cooperate with the locking assembly 54 of the drum box 50 to prevent the developer box 100 from falling off from the drum box 50. The locking protrusion 410 is located on the left side of the shell 110 in the left-right direction, or in other words, the locking protrusion 410 is located on the side of the shell 110 close to the electrical contact surface 221 in the left-right direction; the locking protrusion 410 and the electrical contact surface 221 are separated in the left-right direction, and the electrical contact surface 221 is farther away from the right side of the shell 110 than the locking protrusion 410; in the front-to-back direction, the locking protrusion 410 is farther away from the developing roller 120 than the electrical contact surface 221; the electrical contact surface 221 is located between the coupling gear 150 and the locking protrusion 410 in the front-to-back direction; in the front-to-back direction, there is a first distance between the coupling gear 150 and the electrical contact surface 221, and there is a second distance between the electrical contact surface 221 and the locking protrusion 410, wherein the first distance is greater than the second distance. Fig.10 As shown, in order to better realize the locking function of the drum box 50 on the developer box 100, the locking protrusion 410 is located on the left side of the shell 110 in the left-right direction, and the locking protrusion 410 is located at the rear end of the shell 110 in the front-to-back direction; further, in the present embodiment, the locking protrusion 410 is extended from the rear side of the end cover 112 in the front-to-back direction.

[0056] In this embodiment, the locking assembly 54 includes a driving rod 541 and a locking rod 542. The driving rod 541 can move between a first position in a locked state and a second position in an unlocked state under the action of an external force, and the driving rod 541 can drive the locking rod 542 to move between the first position in the locked state and the second position in the unlocked state. In other words, the locking rod 542 can move between the first position and the second position in the left and right directions, and the locking rod 542 is located at a first end portion of the drum frame 51 in the left and right directions; when the developing cartridge 100 is installed to the drum cartridge 50 device, the first position of the locking rod 542 is configured so that the locking rod 542 limits the developing cartridge 100 to move upward The second position of the locking lever 542 is configured as the position of the locking lever 542 when the developing box 100 can move in the up-down direction relative to the locked lever 542; specifically, the driving lever 541 includes a force-bearing portion 541a for receiving external force and a force-applying portion 541b for transmitting the driving force to the locking lever 542, and a rotating pivot 541d located between the force-bearing portion 541a and the force-applying portion 541b in the up-down direction; the locking lever 542 includes a receiving portion 542a for receiving the forced thrust and a locking portion 542b contacting the locking protrusion 410, and a rotating shaft 542c located above the receiving portion 542a and the locking portion 542b in the up-down direction. The driving lever 541 is rotatably connected to the drum frame 51 through the rotating pivot 541d, and a first elastic member 543 is provided between the driving lever 541 and the drum frame 51, and the first elastic member 543 is used to keep the driving lever 542 in the first position. In this embodiment, the first elastic member 543 is preferably a torsion spring. The locking rod 542 is rotatably connected to the drum frame 51 via a rotating shaft 542c. A second elastic member 544 is provided between the locking rod 542 and the drum frame 51 for keeping the locking rod 542 in the first position. The second elastic member 542 is preferably a torsion spring.

[0057] The following will refer to the attached Figure 12-14 As shown, the process of locking and separating the developing box 100 and the drum box 50 is described.

[0058] like Figure 11-12 As shown, when the developer box 100 is engaged with the drum box 50, the locking rod 542 is located on the left side of the locking protrusion 410 in the left-right direction, and the driving rod 541 is located behind the locking protrusion 410 in the front-to-back direction; the locking protrusion 410 has an upper contact surface facing the upper part of the shell 110 in the up-down direction, and the upper contact surface is extended along the front-to-back direction. At this time, the locking portion 542a of the locking rod 542 contacts the upper contact surface of the locking protrusion 410, thereby limiting the movement of the developer box 100 in the up-down direction and preventing the developer box 100 from falling off from the drum box 50.

[0059] Specifically, in the front-to-back direction, the locking rod 542 is located in front of the driving rod 541, and the driving rod 541 has a first guide surface 541e inclined above one side of the locking rod 542 in the front-to-back direction, and a second guide surface 542d inclined in the left-right direction at the top of the locking rod 542; during the installation of the developing box 100 to the drum box 50, the user installs the developing box 100 from top to bottom into the interior of the drum box 50, and during this process, the locking protrusion 410 of the developing box 100 contacts the first guide surface 541e and the second guide surface 542d, respectively, and respectively pushes the driving rod 542 to temporarily move in the direction of the second position, so that when the limiting protrusion 410 moves to the bottom of the locking portion 542a, the locking protrusion 410 is restricted by the locking portion 542a in the up and down directions, thereby achieving the locking of the developing box 100 by the drum box 50.

[0060] More specifically, when the developing box 100 and the drum box 50 are in the engaged state, the locking rod 542 is located below the locking protrusion 410, and the contact surface between the limiting protrusion 410 and the locking portion 542a extends in the front-to-back direction, thereby increasing the contact area between the locking portion 542a and the locking protrusion 410; compared with the prior art, the locking method of the utility model reduces the influence of the movement of the developing box 100 in the front-to-back direction on the locking function.

[0061] When it is necessary to separate the developing cartridge 100 from the drum cartridge 50, as shown in FIG. Figure 12-13 As shown, the user applies a downward force to the force-bearing portion 541a of the driving rod 541, so that the force-bearing portion 541a of the driving rod 541 rotates backward in the front-to-back direction around the rotating pivot 541d. At the same time, the force-applying portion 541b rotates forward in the front-to-back direction and applies a thrust to the receiving portion 542b of the locking rod 542, so that the locking rod 542 rotates toward the left side in the left-to-right direction around the rotating shaft 542c, and the locking portion 542a rotates to the left side together with the locking rod 542. At this time, the locking portion 542a moves away from above the locking protrusion 410, so that the developing box 100 leaves the drum box 50 from the bottom to the top, thereby realizing the separation of the developing box 100 from the drum box 50.

[0062] When the developer box 100 is installed to the drum box 50, the electrical contact surface 221 and the locking assembly 54 are located on the same side of the developer box 100 in the left-right direction, and in the front-back direction, the electrical contact surface 221 is located between the locking assembly 54 and the photosensitive drum 52. The locking protrusion 410 is restricted by the locking assembly 54, so that the engagement between the developer box 100 and the drum box 50 is more stable, and the electrical connection between the electrical contact surface 221 and the imaging device is more stable.

[0063] Optionally, different from the above embodiment, in other embodiments, the locking protrusion and the locking assembly can also be arranged on the right side of the housing 110, that is, the locking protrusion is arranged on the right side of the housing 110 and extends in the front-to-back direction, and the locking assembly is arranged on the right side of the drum frame 51 at a position corresponding to the locking protrusion. Similar technical effects are achieved through similar technical solutions, which will not be described in detail here.

[0064] 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 aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may 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 embodiments of the present invention.

Claims

1. A developing cartridge that can be detachably mounted in a drum cartridge having a locking lever, 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 a first direction, the developing roller being located on the third side of the housing in the second direction; a coupling gear rotatable about a coupling gear axis extending in the first direction, the coupling gear being used to receive a driving force from outside the developing cartridge, the coupling gear being located on the first side of the housing in the first direction; 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 in that it also includes a locking protrusion; In a state where the developing cartridge is engaged with the drum cartridge, the locking protrusion cooperates with the locking lever to prevent the developing cartridge from being disengaged from the drum cartridge; the electrical contact surface is located between the coupling gear and the locking protrusion in the second direction; 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 locking protrusion, wherein the first distance is greater than the second distance.

2. The developing cartridge according to claim 1, characterized in that: The locking protrusion is spaced apart from the electrical contact surface in the first direction, and the electrical contact surface is farther from the second side of the housing than the locking protrusion.

3. The developing cartridge according to claim 1, characterized in that: the locking protrusion being closer to the fourth side of the housing relative to the third side of the housing in the second direction; The housing further comprises an end cover, wherein the locking protrusion is located on the fourth side of the end cover in the second direction; The locking protrusion is formed to extend from the rear side of the end cover in the second direction.

4. The developing cartridge according to claim 1, wherein: When the developing cartridge is positioned such that: the developing cartridge is placed along the second direction as a horizontal direction and the electrical contact surface faces upward of the housing, the locking protrusion has a contact surface facing upward of the housing in a third direction, the third direction intersecting the first direction and the second direction; The contact surface is formed extending in the second direction.

5. 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, the drum frame can be used to accommodate a developing cartridge, the drum frame having a first end in the first direction and a second end separated from the first end, and the drum frame having a third end and a fourth end in a second direction intersecting the first direction; It is characterized in that it also includes a locking rod, which can rotate from a first position to a second position around a first axis intersecting the first direction; The first position of the locking rod is configured as a position where the locking rod limits the developer box from moving in a third direction, and the second position of the locking rod is configured as a position of the locking rod when the developer box can move in a third direction relative to the locking rod, and the third direction intersects with the first direction and the second direction.

6. The drum cartridge according to claim 5, characterized in that A driving lever is further included, the driving lever being movable relative to the drum frame by receiving a force from outside the drum cartridge, and the locking lever being movable from the first position to the second position according to the movement of the driving lever.

7. The drum cartridge according to claim 6, characterized in that The driving lever comprises a force receiving portion for receiving an external force, a force applying portion for transmitting the driving force to the locking lever, and a rotating pivot, wherein the rotating pivot is located between the force receiving portion and the force applying portion in the third direction.

8. The drum cartridge according to claim 5, characterized in that The locking lever includes a shaft extending generally in the second direction, and the locking lever rotates about the shaft from the first position to the second position.

9. The drum cartridge according to claim 8, characterized in that The locking rod includes a force receiving portion as a force receiving point and a locking portion as a force applying point. In the third direction, the force receiving portion is located between the shaft and the locking portion.

Images