Developing box

Abstract

The utility model discloses a developing box, which can be detachably mounted in a drum box with a photosensitive roller, and comprises a shell for accommodating a developing agent; a developing roller rotatable about a developing roller axis extending in a first direction; a powder feeding roller; a coupling gear for receiving the driving force and rotatable about a coupling gear axis extending in a first direction; the developing roller gear is arranged at one tail end of the developing roller and is used for driving the developing roller to rotate; a chip having an electrical contact surface; lifting the protrusion; the lifting bulge can be in contact with the interior of the electrophotographic imaging device so as to receive the force of the electrophotographic imaging device and drive the developing box to move relative to the drum box; the ratio of the maximum diameter of the developing roller to the maximum diameter of the powder feeding roller is 1-1.3; compared with the prior art, the developing box disclosed by the utility model has the advantages that the structure of the developing box is simplified by redesigning the shell, the developing roller, the powder feeding roller and the gear train, so that the production cost of the developing box is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrophotographic imaging technology, and in particular to a developing cartridge. Background Technology

[0002] A developer cartridge is an imaging consumable used in electrophotographic imaging devices (printers). The developer cartridge stores developer, and a new developer cartridge needs to be replaced after the developer in the cartridge is depleted.

[0003] Currently, the manufacturing cost of developer cartridges remains high. This application provides an upgrade to the developer cartridge to reduce the cost of using it. Utility Model Content

[0004] Therefore, this utility model provides a developing cartridge that reduces production costs through a redesign of its internal structure. This is mainly achieved through the following technical solutions:

[0005] A developing cartridge, removably mountable into a drum cassette having a photosensitive roller, the developing cartridge comprising:

[0006] A housing for containing 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;

[0007] The developing roller is rotatable 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;

[0008] A powder feeding roller, rotatable about a powder feeding roller axis extending in the first direction, the powder feeding roller being used to deliver the developer to the developing roller;

[0009] A coupling gear for receiving driving force and rotatable about a coupling gear axis extending in the first direction, wherein the coupling gear is located on the first side of the housing in the first direction;

[0010] A developing roller gear is disposed at one end of the developing roller and is used to drive the developing roller to rotate;

[0011] The chip has an electrical contact surface located on the first side of the housing in the first direction;

[0012] Elevation and protrusion;

[0013] With the developing cartridge installed in the electrophotographic imaging device, the lifting protrusion can contact the interior of the electrophotographic imaging device to receive the force of the electrophotographic imaging device and drive the developing cartridge to move relative to the drum.

[0014] The ratio of the maximum diameter of the developing roller to the maximum diameter of the powder feeding roller is 1 to 1.3.

[0015] Furthermore, when viewed along the first direction, the distance between the developing roller axis and the coupling gear axis is greater than the distance between the powder feeding roller axis and the coupling gear axis.

[0016] Furthermore, a connecting gear is provided between the coupling gear and the developing roller gear, and multiple connecting gears are provided.

[0017] Furthermore, the number of connecting gears is set to an even number.

[0018] Furthermore, in a third direction intersecting the first and second directions, the electrical contact surface is movable relative to the drum as the developing cartridge moves;

[0019] The amount of movement of the electrical contact surface relative to the drum box is L, where 3.3mm≤L≤10mm.

[0020] Furthermore, an elastic element is provided between the lifting protrusion and the housing.

[0021] Furthermore, in the second direction, the lifting protrusion is further away from the developing roller than the electrical contact surface.

[0022] Furthermore, the electrical contact surface is disposed on the first side of the housing in the first direction, and the electrical contact surface is close to the fourth side of the housing in the second direction.

[0023] Furthermore, the developing cartridge also includes a forced pusher, which can cooperate with the drum cartridge to drive the developing roller to shift toward the side closer to the photosensitive drum;

[0024] The forced push portion is closer to the fourth side of the housing than the third side of the housing in the second direction.

[0025] Furthermore, the developing cartridge also includes a guided protrusion that extends in the first direction;

[0026] When viewed along the first direction, at least a portion of the guided protrusion overlaps with the developing roller.

[0027] Beneficial effects:

[0028] In this invention, the structure of the developing cartridge is simplified by redesigning the housing, developing roller, powder feeding roller, and gear system, thereby reducing the production cost of the developing cartridge. Attached Figure Description

[0029] Figure 1 It is a type of drum box in the existing technology;

[0030] Figure 2 This is a perspective view of the developing cartridge of this utility model;

[0031] Figure 3 This is a perspective view of the developing cartridge of this utility model from another angle;

[0032] Figure 4 This is a top view of the developing cartridge of this utility model in the vertical direction;

[0033] Figure 5 This is a left view of the developing cartridge of this utility model in the left-right direction;

[0034] Figure 6 This is a front view of the developing cartridge of this utility model in the front-rear direction;

[0035] Figure 7 This is an exploded structural diagram of the left end of the developing cartridge of this utility model;

[0036] Figure 8 This is an exploded structural diagram of the cover of this utility model;

[0037] Figure 9 This is a left view of the developing cartridge and the drum cartridge in the first position of the present invention, in the left-right direction.

[0038] Figure 10 This is a left view of the developing cartridge and drum in the second position of the present invention, in the left-right direction.

[0039] Figure 11 This is a perspective view of the developing cartridge in Embodiment 2 of this utility model;

[0040] Figure 12 This is a top view of the developing cartridge in the vertical direction in Embodiment 2 of this utility model;

[0041] Figure 13 This is Embodiment 2 of the present invention. Figure 12 A cross-sectional view along the AA direction;

[0042] Figure 14 This is a left view of the developing cartridge in the left-right direction in Embodiment 2 of this utility model;

[0043] Figure 15 This is an exploded structural diagram of the cover in Embodiment 2 of this utility model;

[0044] Figure 16This is a left view of the developing cartridge in the left-right direction in Embodiment 2 of this utility model with the protective cover hidden.

[0045] Figure 17 This is a schematic diagram showing the positional relationship between the developing roller and the powder feeding roller in Embodiment 2 of this utility model. Detailed Implementation

[0046] To make the objectives, technical solutions, and technical effects of the embodiments of this utility model clearer, the technical solution of the developing cartridge of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely preferred embodiments of this utility model, and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the protection scope of this utility model.

[0047] Figure 1 The diagram shows a prior art drum cartridge 50 that can be used in conjunction with the developing cartridge 100 of this invention. Figure 2-6 The diagram shows a developing cartridge 100 of the present invention. The developing cartridge 100 can be detachably installed into the drum cartridge 50, and then the two can be detachably installed together into an electrophotographic imaging device (hereinafter referred to as "imaging device") for imaging operations. The imaging device is specifically a laser electronic printer.

[0048] like Figure 1 As shown in the figure, a prior art drum box 50 is illustrated. The drum box 50 includes a drum frame 51, which has a developing cartridge receiving portion configured as a cavity to accommodate a developing cartridge 100. A photosensitive drum 52 is rotatably supported on one side of the drum frame 51 in the front-rear direction. The photosensitive drum 52 is arranged in the front side of the developing cartridge receiving portion in the front-rear direction and can rotate about a photosensitive drum axis extending in the left-right direction. The drum box 50 also includes push-pull assemblies 55 respectively disposed on the left and right sides inside the developing cartridge receiving portion. The push-pull assemblies 55 are elastic push-pull assemblies that can apply an elastic push-pull force externally. A locking member 54 is also disposed on the rear side of the push-pull assembly 55 on the right side of the drum box 50. The locking member 54 is not limited to being disposed in a position behind the push-pull assembly 55 on the right side of the drum box 50. The locking member 54 can lock the developing cartridge 100 by blocking the movement of the developing cartridge 100, thereby stably holding the developing cartridge 100 in the drum box 50 and preventing the developing cartridge 100 from accidentally falling out of the drum box 50.

[0049] The developing cartridge housing is provided with guide portions 56 on both sides in the left-right direction. The guide portions 56 are used to guide the developing cartridge 100 to the correct position in the developing cartridge housing. In the front-back direction, the guide portions 56 are located between the photosensitive drum 52 and the push assembly 5. When viewed in the left-right direction, the push assembly 55, the guide portions 56 and the photosensitive drum 52 are generally arranged from back to front in the front-back direction.

[0050] like Figure 2-8 As shown in the figure, a developing cartridge 100 of this utility model is illustrated. The developing cartridge 100 includes a housing 101, which has a first side and a second side separately disposed in the left-right direction, and a third side and a fourth side separately disposed in the front-back direction. The housing 101 includes a powder container 102 for containing developer. A cover 103 is detachably installed on the left side of the powder container 101a, which covers at least a portion of the gear train. The gear train is located on the first side of the housing 101 in the left-right direction. Figure 7-8 As shown, the gear system includes, but is not limited to, a coupling gear 111, a developing roller gear 112, a powder feeding roller gear 113, a stirrer gear 114, and multiple connecting gears. The coupling gear 111 includes a coupling portion 111a and a gear portion 111b. The gear portion 111b moves with the movement of the coupling portion 111a. In this embodiment, the coupling portion 111a and the gear portion 111b are integrally formed. The developing roller gear 112 is connected to the gear portion 111b of the coupling gear 111 through multiple connecting gears. The powder feeding roller gear 113 is meshed with the gear portion 111b of the coupling gear 111. The stirrer gear 114 is connected to the gear portion 111b of the coupling gear 111 through one or more connecting gears, so that the developing roller gear 112, the powder feeding roller gear 113, and the stirrer gear 114 can rotate with the rotation of the coupling gear 111.

[0051] Furthermore, the number of connecting gears between the developing roller gear 112 and the coupling gear 111 is set to an even number. In other words, 2n (n is a positive integer) connecting gears connect the developing roller gear 112 and the coupling gear 111. Of course, this is not a limitation; the developing roller gear 112 can also directly mesh with the gear portion 111b of the coupling gear 111. The rotation directions of the developing roller gear 112 and the coupling gear 111 are opposite. The number of connecting gears between the agitator gear 114 and the coupling gear 111 is set to an odd number. In other words, 2n+1 (n is 0 or a positive integer) connecting gears connect the developing roller gear 112 and the coupling gear 111. Of course, this is not a limitation; the rotation directions of the agitator gear 114 and the coupling gear 111 are the same. In this embodiment, a first connecting gear 115 and a second connecting gear 116 connect the coupling gear 111 and the developing roller gear 112, as shown below. Figure 8As shown, the first connecting gear 115 and the second connecting gear 116 are connected to the inner side of the cover 103 via the first support column 103a and the second support column 103b, respectively. The first connecting gear 115 meshes with the gear portion 111b of the coupling gear 111, and the second connecting gear 116 meshes with the developing roller gear 112. The driving force of the coupling gear 111 can be transmitted to the developing roller gear 112 through the first connecting gear 115 and the second connecting gear 116. A third connecting gear 117 is connected between the coupling gear 111 and the agitator gear 114. The third connecting gear 117 meshes with both the coupling gear 111 and the agitator gear 114, and the coupling gear 111 transmits driving force to the agitator gear 114 through the third connecting gear 117. With the developing cartridge 100 installed in the imaging apparatus, the coupling part 111a of the coupling gear 111 can be connected to the driving member (not shown) in the imaging apparatus to receive the driving force of the imaging apparatus, so that the coupling gear 111 rotates about its axis extending in the left and right direction. The coupling gear 111 then transmits the driving force to the developing roller gear 112, the powder feeding roller gear 113 and the agitator gear 114, so that the developing roller gear 112, the powder feeding roller gear 113 and the agitator gear 114 rotate about their respective axes extending in the left and right direction. The developing cartridge 100 also includes a developing roller 120, a powder feeding roller 130, and a stirrer 140, which are rotatably supported by the housing 101. The developing roller gear 112, the powder feeding roller gear 113, and the stirrer gear 114 are respectively connected to the left ends of the developing roller 120, the powder feeding roller 130, and the stirrer 140, and can respectively drive the developing roller 120, the powder feeding roller 130, and the stirrer 140 to rotate around their respective axes extending in the left-right direction. The developing roller 120 is located on the third side of the housing 101 in the front-back direction, and the powder feeding roller 130 is positioned close to the developing roller 120 in the front-back direction. The agitator 140 is located on the fourth side of the housing 101, which is closer to the developing roller 120 than the developing roller 120. In the front-to-back direction, the agitator 140 is closer to the fourth side of the housing 101 than the powder feeding roller 130. That is, in the front-to-back direction, the developing roller 120, the powder feeding roller 130 and the agitator 104 are arranged from front to back. The rotation of the agitator 104 and the powder feeding roller 130 agitates the developer inside the powder hopper 102 and transports the developer inside the powder hopper 102 from back to front to the developing roller 120. The developing roller 102 transports the developer to the photosensitive drum 52 by rotating to develop the electrostatic latent image on the photosensitive drum 52, thereby realizing the imaging operation.

[0052] like Figure 2-3As shown, the developing cartridge 100 is provided with a locking protrusion 107 on the right side in the left-right direction, which cooperates with the locking member 54 in the drum cassette 50. When the developing cartridge 100 is installed in the drum cassette 50, the locking protrusion 107 cooperates with the locking member 54 on the drum cassette 50 to stably hold the developing cartridge 100 in the drum cassette 50 and prevent the developing cartridge 100 from falling out of the drum cassette 50. The developing cartridge 100 is provided with forced push protrusions 106 on both sides in the left-right direction, which cooperate with the forced push part 55 in the drum cassette 50. The forced push protrusions 106 are formed by extending outward from the side walls of the toner hopper 102 in the left-right direction. When the developing cartridge 100 is installed in the drum cassette 50, the forced push protrusions 106 can receive the force in the front-back direction provided by the forced push part 55 to make the developing roller 120 and the photosensitive drum 52 in close contact. The developing cartridge 100 also includes guided protrusions 105 on both sides in the left-right direction. At least a portion of the guided protrusions 105 coincides with the roller shaft of the developing roller 120 when viewed in the left-right direction. The guided protrusions 105 are constructed as columnar protrusions extending in the left-right direction. During the installation of the developing cartridge 100 into the drum cassette 50, the guided protrusions 105 cooperate with the guide portion 56 in the drum cassette 50 to install the developing cartridge 100 into the correct position in the drum cassette 50. In other embodiments of this utility model, the guided protrusions 105 may also be formed by the roller shaft of the developing roller 120 extending out of the housing 101 in the left-right direction.

[0053] like Figure 4As shown, the developing cartridge 100 also includes a chip 171 for storing information about the developing cartridge 100. The chip 171 is located on the first side of the housing 101 in the left-right direction. Specifically, the developing cartridge 100 also includes a chip holder 172 extending outward from the outer side of the cover 103 away from the powder compartment 102 in the left-right direction. The chip holder 172 is used to fix and support the chip 171 on the first side of the housing 101. In the front-back direction, the chip 171 is further away from the developing roller 120 than the coupling gear 111. That is, the electrical contact surface 171a is positioned on the first side of the housing 101 in the left-right direction, and in the front-back direction, the electrical contact surface 171a is further away from the developing roller 120 than the coupling gear 111. In the front-back, left-right, and up-down directions, the electrical contact surface 171a is connected to the coupling gear 111. The 11-spaced arrangement prevents the electrical contact surface 171a from interfering with the driving force of the coupling gear 111 received by the imaging device. The chip 171 includes an electrical contact surface 171a and a storage section (not shown). The storage section is electrically connected to the electrical contact surface 171a and records information about the developing cartridge 100. When the developing cartridge 100 is installed in the imaging device, the electrical contact surface 171a contacts and forms an electrical connection with the electrical contacts 12 inside the imaging device, thereby establishing a communication link between the developing cartridge 100 and the imaging device. When the developing cartridge 100 is in use, the imaging device identifies the developing cartridge 100 and records its information. Before the developing cartridge 100's service life is exhausted, the imaging device can prompt the user to replace the developing cartridge 100 in time through the operation panel or indicator lights.

[0054] The developing cartridge 100 also includes an electrode 160, which has an electrical contact portion 161 exposed on a second side of the housing 101 in the left-right direction. When the developing cartridge 100 is installed in the imaging device, the electrical contact portion 161 can be electrically connected to a power supply component (not shown) inside the imaging device to receive power from the imaging device. The electrode 160 is electrically connected to at least one of the developing roller 120, the powder delivery roller 130, and the powder discharge blade 104 to supply power to at least one of them, thus facilitating the delivery of developer in the powder hopper 102. In this embodiment, the electrode 160 is electrically connected to the developing roller 120 and the powder delivery roller 130 to supply power to them. The electrical contact surface 171a and the electrical contact portion 161 are spaced apart on both sides of the housing 101 in the left-right direction to prevent interference between them when they are electrically connected to the imaging device.

[0055] Compared to existing developing cartridges, the toner cartridge 102 in the developing cartridge 100 of this invention has a shorter vertical distance. During the installation of the developing cartridge 100 into the imaging device, the developing cartridge 100 of this invention has greater operating space, reducing interference between the developing cartridge 100 and the interior of the imaging device, thus allowing the developing cartridge 100 to be installed more smoothly into the imaging device. Specifically, in Figure 5 In the vertical direction shown, the lowest point of the powder compartment 102 is higher than the lowest point of the cover 103. Forced-push protrusions 106 extend outwards from both sides of the powder compartment 102. These forced-push protrusions 106 are constructed as plate-shaped protrusions extending in the front-back direction to reduce the vertical space of the forced-push protrusions 106, making the structure of the developing cartridge 100 more compact. Furthermore, the shorter vertical distance of the powder compartment 102 miniaturizes the developing cartridge 100 and also reduces its production cost.

[0056] Compared with the prior art, the toner cartridge 102 increases the range of motion of the developing cartridge 100 relative to the drum cartridge 50 by eliminating the support portion 102b at the bottom of the toner cartridge 102 that contacts the drum frame 51 in the drum cartridge 52. Specifically, as shown in the figure... Figure 9-10 As shown, with the developing cartridge 100 installed in the imaging device, the developing cartridge 100 can move between a first position and a second position relative to the drum frame 51 of the drum housing 50. In the vertical direction, the second position of the developing cartridge 100 is further away from the bottom of the drum housing 50 than the first position of the developing cartridge 100 relative to the drum housing 50. That is, in the vertical direction, the second position of the developing cartridge 100 is at a higher position than the first position of the developing cartridge 100. The first position of the developing cartridge 100 is the position of the developing cartridge 100 relative to the drum housing 50 before the developing cartridge 100 and drum housing 50 are installed in the imaging device. The second position of the developing cartridge 100 is the position of the developing cartridge 100 relative to the drum housing 50 when the developing cartridge 100 and drum housing 50 are installed inside the imaging device. Figure 7-10 As shown, the developing cartridge 100 also includes a lifting portion 181 movable relative to the housing 101. An elastic member 182 is provided between the housing 101 and the lifting portion 181. The lifting portion 181 can receive external forces from the developing cartridge 100 from a first position. Figure 10 Move to the second position (as shown by the dashed line). Figure 10 (As shown by the solid line in the middle), the developing cartridge 100 is moved from its first position to its second position. When the lifting part 181 is not subjected to external force, the elastic member 182 pushes the lifting part 181 from its second position to its first position. The elastic member 182 is preferably a spring. Specifically, as shown... Figure 8 and Figure 10As shown, the cover 103 has a mounting groove 103c at its rear end in the front-rear direction. At least a portion of the lifting part 181 is located inside the mounting groove 103c. Before the combination of the developing cartridge 100 and the drum cartridge 50 is installed into the imaging device, the developing cartridge 100 is in the first position. At this time, the combination of the developing cartridge 100 and the drum cartridge 50 is relatively low in the vertical direction, and the combination of the developing cartridge 100 and the drum cartridge 50 can smoothly enter the interior of the imaging device. After the combination of the developing cartridge 100 and the drum cartridge 50 enters the interior of the imaging device, the user closes the outer cover 11 of the imaging device from bottom to top. During the closing process of the outer cover 11, the force plate 11a located inside the outer cover 11 contacts the lifting part 181 and pushes the lifting part 181 to move from back to front along the mounting groove 103c. Observed in the left-right direction, the lifting part 181 is set as a triangular or trapezoidal structure that is narrow at the front and wide at the back. In other words, the length of the front end of the lifting part 181 in the front-rear direction in the vertical direction is less than the length of the rear end of the lifting part 181 in the front-rear direction in the vertical direction. During the movement of the lifting section 181 from back to front, the bottom of the lifting section 181 contacts the abutment surface 57 on the drum frame 51. Thus, the lifting section 181 is simultaneously subjected to a forward pushing force and an upward supporting force. Under the action of these two forces, the lifting section 181 drives the developing cartridge 100 to move from the first position to the second position. During this movement, the electrical contact surface 171a also moves along with the developing cartridge 100 from the first position (…). Figure 10 The position shown by the middle dashed line) towards the second position ( Figure 10 The position (shown by the solid line) is moved so that the electrical contact surface 171a contacts the electrical contact 12 inside the imaging device in the second position and provides the electrical contact surface 171a with a direction that causes the electrical contact surface 171a to be offset toward the electrical contact 12, so that the developing cartridge 100 and the electrical contact 12 inside the imaging device are stably connected.

[0057] Furthermore, such as Figure 10 As shown, during the process of the developing cartridge 100 moving from the first position to the second position, the electrical contact surface 171a moves by a distance L in the vertical direction. The value of L is in the range of 3.3mm≤L≤10mm. When L is less than 3.3mm, the combination of the developing cartridge 100 and the drum cartridge 50 will interfere with the imaging device during the installation process, increasing the difficulty of loading and unloading the machine and reducing the user experience. When L is greater than 10mm, the capacity of the toner cartridge 102 is reduced, affecting the sheet output of the developing cartridge 100 and increasing the operating cost of the developing cartridge 100. Preferably, in this embodiment, 5mm≤L≤6mm.

[0058] Example 2:

[0059] Appendix Figure 11-17The present invention illustrates a developing cartridge according to Embodiment 2. The parts identical to those in Embodiment 1 will not be repeated here. The difference in Embodiment 2 lies in the structure of the developing cartridge and the developing rollers disposed within it, which differ from those in Embodiment 1. Specifically, as shown... Figure 11-14 As shown, the developing cartridge 100 has a force-applying part 109 on its first side in the left-right direction. The force-applying part 109 is further away from the developing roller 120 in the front-back direction than the rotation axis of the coupling gear 111. When the developing cartridge 100 is installed in the drum cassette 50, the force-applying part 109 can contact a rear wall (not shown) of the developing cartridge receiving portion in the drum cassette 50 and apply a pushing force to that rear wall. While the force-applying part 109 applies a pushing force to the drum cassette 50, it is also subjected to a reaction force from the drum cassette 50, thereby causing the developing roller 120 to come into close contact with the photosensitive drum 52 in the drum cassette 50. That is to say, in this embodiment, the force-applying part 109 can replace the function of the forced push protrusion 106 in the above embodiment 1. Optionally, in this embodiment, the developing cartridge 100 is provided with the force-applying part 109 instead of the forced push protrusion 106.

[0060] like Figure 11-14 As shown, the developing cartridge 100 also includes a detection protrusion 108. The detection protrusion 108 can move relative to the housing 101 according to the rotation of the coupling gear 111. The detection protrusion 108 is disposed on the first side of the housing 101 in the left-right direction, and is closer to the fourth side of the housing 101 in the front-back direction relative to the third side of the housing 101. When the developing cartridge 100 is installed in the imaging device, the detection protrusion 108 can actuate the detection component (not shown) inside the imaging device to transmit information such as the age of the developing cartridge 100 to the imaging device. That is to say, in this embodiment, the detection protrusion 108 replaces at least a part of the function of the chip 171 in the above embodiment 1. Optionally, the developing cartridge 100 of this utility model can be provided with the detection protrusion 108 or the chip 171 alone, or it can be provided with both the detection protrusion 108 and the chip 171 simultaneously.

[0061] like Figure 17As shown, compared with the prior art, the developing roller 120 is set to a smaller size to reduce the material cost of the developing roller 120, thereby reducing the production cost of the developing cartridge 100. Specifically, the diameter of the developing roller 120 is R1, and the diameter of the powder feeding roller 130 is R2. In the prior art, the maximum outer diameter of the developing roller 120 is approximately 1.5 times the maximum outer diameter of the powder feeding roller 130, that is, in the prior art, R1≈1.5*R2, specifically, 1.4*R2≤R1≤1.6*R2. In this embodiment, the developing roller 120 is set to a smaller size, 0.9*R2≤R1≤1.3*R2. Preferably, in this embodiment, the value range of R1 is 12.5-17mm, and the value range of R2 is 13.2±0.1mm. More preferably, R2≤R1≤1.3*R2. Preferably, in this embodiment, the value range of R1 is 16±1mm, and the value range of R2 is 13.2±0.1mm.

[0062] like Figure 15-16 As shown, in this embodiment, the gear system also includes a drive gear 118 for transmitting driving force to the detected protrusion 108. The drive gear 118 is meshed with the gear portion 111b of the coupling gear 111 through the stirring rack gear 114 and the third connecting gear 117. When the developing cartridge 100 is installed in the imaging device, the drive gear 118 can receive the driving force of the coupling gear 111 and drive the drive gear 118 to rotate around the drive gear axis A5 extending in the left-right direction. The drive gear 118 is provided with at least one actuating protrusion 118a on the side away from the powder compartment 102 in the left-right direction. When the drive gear 118 rotates, the actuating protrusion 118a applies a pushing force to the detected protrusion 108 installed on the cover 103 to drive the detected protrusion 108 to move relative to the cover 103. The detected protrusion 108 can actuate the detection components inside the imaging device to transmit information such as whether the developing cartridge 100 is a new cartridge to the imaging device. To ensure that the developing roller 120 maintains contact with the photosensitive drum 52, the axis A1 of the developing roller 120 is positioned further forward in the front-to-back direction. For example... Figure 16 As shown, when viewed from the left side of the developing chamber 100 along the left-right direction, the distance S1 between the axis A1 of the developing roller 120 and the rotation axis A2 of the coupling gear 111 is greater than the distance S2 between the axis A3 of the powder feeding roller 130 and the rotation axis A2 of the coupling gear 111. When viewed from the left side of the developing chamber 100 along the left-right direction, the axis A1 of the developing roller 120, the axis A3 of the powder feeding roller 130, the rotation axis A2 of the coupling gear 111, the rotation axis of the stirring rack 140, and the axis A5 of the drive gear are arranged sequentially in the front-back direction.

[0063] Functions and beneficial effects:

[0064] The development cartridge simplifies its structure by redesigning the housing, developing roller, powder feeding roller, and gear system, thereby reducing the production cost of the development cartridge.

[0065] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A developing cartridge, removably mountable into a drum housing having a photosensitive drum, the developing cartridge comprising: A housing for containing 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; The developing roller is rotatable 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; A powder feeding roller, rotatable about a powder feeding roller axis extending in the first direction, the powder feeding roller being used to deliver the developer to the developing roller; A coupling gear for receiving driving force and rotatable about a coupling gear axis extending in the first direction, wherein the coupling gear is located on the first side of the housing in the first direction; A developing roller gear is disposed at one end of the developing roller and is used to drive the developing roller to rotate; The chip has an electrical contact surface located on the first side of the housing in the first direction; The developing cartridge is characterized by further including a lifting protrusion; With the developing cartridge installed in the electrophotographic imaging device, the lifting protrusion can contact the interior of the electrophotographic imaging device to receive the force of the electrophotographic imaging device and drive the developing cartridge to move relative to the drum. The ratio of the maximum diameter of the developing roller to the maximum diameter of the powder feeding roller is 1 to 1.

3.

2. The developing cartridge according to claim 1, characterized in that, When viewed along the first direction, the distance between the axis of the developing roller and the axis of the coupling gear is greater than the distance between the axis of the powder feeding roller and the axis of the coupling gear.

3. The developing cartridge according to claim 1, characterized in that, A connecting gear is provided between the coupling gear and the developing roller gear, and multiple connecting gears are provided.

4. The developing cartridge according to claim 3, characterized in that, The number of connecting gears is set to an even number.

5. The developing cartridge according to claim 1, characterized in that, In a third direction intersecting the first and second directions, the electrical contact surface is movable relative to the drum as the developing cartridge moves; The amount of movement of the electrical contact surface relative to the drum box is L, where 3.3mm≤L≤10mm.

6. The developing cartridge according to claim 1, characterized in that, An elastic element is provided between the lifting protrusion and the housing.

7. The developing cartridge according to claim 1, characterized in that, In the second direction, the raised protrusion is further away from the developing roller than the electrical contact surface.

8. The developing cartridge according to claim 1, characterized in that, The electrical contact surface is disposed on the first side of the housing in the first direction, and the electrical contact surface is located near the fourth side of the housing in the second direction.

9. The developing cartridge according to claim 1, characterized in that, The developing cartridge also includes a forced pusher that can cooperate with the drum cartridge to drive the developing roller to shift toward the side closer to the photosensitive drum; The forced push portion is closer to the fourth side of the housing than the third side of the housing in the second direction.

10. The developing cartridge according to claim 1, characterized in that, The developing cartridge also includes a guided protrusion that extends in the first direction; When viewed along the first direction, at least a portion of the guided protrusion overlaps with the developing roller.

Images