Processing box and image forming device

Abstract

The utility model relates to a processing box and an image forming device, the processing box is detachably arranged in the image forming device, and the processing box comprises a box body, a photosensitive drum, a developing roller and a charging roller, the developing roller comprises a developing roller shaft; the charging roller comprises a charging roller shaft; the first conductive piece is arranged at one end of the box body in the length direction; the second conductive part is arranged at one end, opposite to the first conductive part, of the photosensitive drum; the third conductive part is arranged on the box body in the opposite direction of the first conductive part and is in contact with the end part of the charging roll shaft; wherein the distance L1 from any point of the first conductive piece to the second conductive piece, the distance L2 from any point of the first conductive piece to the third conductive piece, and the distance L3 from any point of the first conductive piece to the end face of the developing roller shaft meet the following relations: L1lt; l2lt; and L3. Compared with the prior art, the processing box image forming device provided by the utility model can ensure better electric connection between the high-voltage contact on the image forming device and the charging roller and the developing roller of the processing box, so that the problem of printing defects is avoided.

Description

Technical Field

[0001] The utility model relates to a processing box and an image forming device. Background Art

[0002] An image forming device forms an image on a print medium based on an input signal. Printers, copiers, fax machines, and multifunction devices (MFPs) that integrate the functions of printers, copiers, and fax machines are examples of image forming devices. For example, a printer is crucial for charging the charging roller, developer roller, and photosensitive drum, generating a high-voltage charge that enables toner to be transferred between the developer roller and photosensitive drum, and between the photosensitive drum and paper. Charging the charging roller, developer roller, and photosensitive drum requires contact springs that contact a high-voltage plate, transferring the high voltage to the charging roller, developer roller, and photosensitive drum via wires or springs. In existing technology, the charging roller and developer roller electrodes on the process cartridge are located on the same surface. When the process cartridge is installed in the image forming device, the contact springs on the image forming device body deform when subjected to external forces, preventing proper contact with the charging roller and developer roller electrodes on the process cartridge. This results in poor charging of the process cartridge and defective image formation. Summary of the Invention

[0003] In order to ensure that the charging roller electrode and the developing roller electrode of the process cartridge can maintain good electrical connection with the image forming device, thereby preventing defects in image formation.

[0004] In a first aspect, the present invention provides a process cartridge that is detachably mounted in an image forming apparatus, comprising a cartridge body; a photosensitive drum rotatably mounted on the cartridge body;

[0005] A developing roller, the developing roller being rotatably mounted on the cartridge body and arranged parallel to the photosensitive drum, comprising a developing roller shaft; a charging roller, the charging roller being rotatably mounted on the cartridge body and arranged parallel to the photosensitive drum, comprising a first conductive member of the charging roller shaft, arranged at one end in the longitudinal direction of the cartridge body; a second conductive member, arranged at one end of the photosensitive drum in the opposite direction to the first conductive member; and a third conductive member, arranged on the cartridge body in the opposite direction to the first conductive member, in contact with the end of the charging roller shaft; wherein the distance L1 from any point of the first conductive member to the second conductive member, the distance L2 from any point of the first conductive member to the third conductive sheet, and the distance L3 from any point of the first conductive member to the end face of the developing roller shaft, satisfy the following relationship: L1 <L2<L3。

[0006] In combination with the first aspect, in a possible design, the processing box also includes an end cover, the end cover is provided with a first mounting hole, a second mounting hole and a recess, the second mounting hole is provided in the recess, the first mounting hole cooperates with the developing roller shaft, and the second mounting hole cooperates with the third conductive part.

[0007] In combination with the first aspect, in a possible design, the processing box further includes a chip, which is mounted on the box body and connected to the first conductive member.

[0008] In combination with the first aspect, in a possible design, the box body is provided with a third mounting hole for the first conductive member to pass through.

[0009] In combination with the first aspect, in a possible design, the first conductive member is connected to the chip and has a first contact portion exposed to the surface of the process box.

[0010] In combination with the first aspect, in a possible design, the second conductive member has a clamping portion, and the clamping portion contacts the inner wall of the photosensitive drum.

[0011] In combination with the first aspect, in a possible design, the third conductive member is connected to the charging roller and has a second contact portion exposed on the surface of the process box.

[0012] In the second aspect, the utility model also provides an image forming device, comprising a main body and the aforementioned processing box installed in the main body, wherein the main body is provided with high-voltage contacts, and is characterized in that when the processing box is installed to the main body, one of the high-voltage contacts is electrically connected to the second contact portion of the third conductive member of the processing box, and the other one of the high-voltage contacts is electrically connected to the end of the developing roller of the processing box.

[0013] In combination with the second aspect, in a possible design, the main body is provided with a grounding component, and when the processing box is installed to the main body, the grounding component is electrically connected to the first conductive member.

[0014] The processing box and image forming device provided in the present application can ensure that the high-voltage contacts on the image forming device body form a good electrical connection with the charging roller conductive parts and the end of the developing roller on the processing box, thereby preventing the formation of printed image defects.

[0015] Other features and advantages of the embodiments of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the embodiments of the present invention. The purposes and other advantages of the embodiments of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the image forming device in the present utility model;

[0018] Figure 2 It is a cross-sectional view of the processing box in the utility model;

[0019] Figure 3 It is a cross-sectional view of the processing box in the utility model;

[0020] Figure 4 It is a three-dimensional diagram of the end cover of the processing box in the present utility model;

[0021] Figure 5 This is a partial cross-sectional view of the first conductive member and the box body in the present invention;

[0022] Figure 6 It is a three-dimensional diagram of the first conductive member in the present utility model;

[0023] Figure 7 It is a side view of the first conductive member in the present invention.

[0024] Figure 8 It is a partial cross-sectional view of the installation and cooperation of the second conductive member and the photosensitive drum in the present utility model;

[0025] Figure 9 It is a three-dimensional diagram of the second conductive member in the present invention;

[0026] Figure 10 It is a three-dimensional diagram of the third conductive member in the present utility model;

[0027] Figure 11 A three-dimensional diagram of the high-voltage contacts of the image forming device body in the present invention

[0028] In the picture:

[0029] 1. Image forming device; 2. Imaging assembly; 3. Laser scanning unit; 4. Fixing assembly; 5. Transfer roller; 6. Paper box; 7. Transport assembly;

[0030] 21. Photosensitive drum; 22. Developing drum; 23. Charging roller; 24. Powder discharge blade; 25. Second conductive member; 26. Developing roller shaft; 27. Charging roller shaft; 28. Stirring member; 29. ​​First conductive member; 30. Third conductive member; 31. End cap; 32. Second mounting hole; 33. First mounting hole; 34. Third mounting hole; 35. Chip; 36. Conductive steel shaft; 37. Grounding conductive sheet; 38. High-voltage contact; 39. High-voltage contact;

[0031] 291, first contact portion; 292, first clamping portion; 293, elastic arm; 294, first bending portion; 295, second bending portion; 296, second clamping portion;

[0032] 251, shrapnel;

[0033] 301, second contact portion; 302, third contact portion;

[0034] 311. Side of the end cap; 312. Recessed portion

[0035] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0040] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0041] like Figure 1 The image forming apparatus 1 shown is a schematic diagram of the overall structure. The image forming apparatus 1 generally includes a control panel, an imaging component 2, a laser scanning unit 3, a fixing component 4, a transfer roller 5, a paper box 6, and a conveying component 7.

[0042] Structurally, the image forming device 1 includes an outer shell, and a frame is arranged inside the outer shell. The frame is the skeleton part of the entire machine. The above-mentioned imaging component 2, laser scanning unit 3, fixing component 4, transfer roller 5, paper box 6, and conveying component 7 are assembled in the internal frame. The frame provides fixed support for the installation, positioning and circuit connection of each module component.

[0043] The user operates the control panel to coordinate the various modules to complete a print task. First, upon receiving a print control command, the laser scanning unit 3 uses a laser to scan the imaging assembly 2, forming the desired image. The transport assembly 7 removes the print medium (typically paper) from the paper tray 6 and transports it to the nip formed by the imaging assembly 2 and the transfer roller 5. After the paper passes through the nip, the desired image is transferred to the print medium. The transport assembly 7 then transports the paper with the toner image to the fixing assembly 4 for fixing, which fixes the toner image on the paper surface before it is discharged.

[0044] Specifically, the imaging assembly 2 includes a photosensitive drum 21, a developing roller 22, a charging roller 23, a powder blade 24, a stirring member 28, and a cleaning member. The specific imaging steps include:

[0045] The first step: charging. The charging roller or corona assembly 23 is used to charge the surface of the photosensitive drum with a uniform positive (negative) charge.

[0046] Step 2: Exposure: The laser scanning unit 3 emits a laser beam carrying digital information to scan the surface of the photosensitive drum 21. The surface of the photosensitive drum 21 illuminated by the laser becomes conductive, the voltage is reduced, and an electrostatic latent image with different potentials is formed on the surface of the photosensitive drum.

[0047] Step 3: Development. First, the developer, a mixture of toner and carrier, is attracted to the surface of the developing roller 22. Controlled by the powder blade 24, a uniform layer of developer of a specific thickness forms on the roller 22. During this process, friction charges the toner. Then, through the action of an AC / DC bias, the toner is transferred to the photosensitive drum. The electrostatic latent image on the drum attracts the toner, forming a visible toner image on the drum surface.

[0048] Step 4: Transfer. The photosensitive drum 21, carrying the toner image, rotates and encounters the paper in the conveyor assembly 7. The transfer roller 5 applies a negative (positive) voltage to the back of the paper, attracting the positive (negative) charged toner image to the paper.

[0049] Step 5: Fixing. The paper carrying the toner image enters the fixing assembly 4, which consists of a heating roller and a pressure roller. Under the action of heat and pressure, the toner image on the paper is melted and fixed to the paper fibers, forming the print we see.

[0050] Step 6: Cleaning. Since not all the toner on the surface of the photosensitive drum 21 is transferred to the paper, the remaining toner on the photosensitive drum 21 must be removed with a cleaning blade and collected in the waste toner bin for subsequent processing.

[0051] Step 7: Discharge: After the transfer, the surface of the photosensitive drum 21 still carries a small amount of static charge. The imaging assembly 2 uses the charging roller 23 to eliminate the static charge remaining on the surface of the photosensitive drum so that the next cycle of development can be carried out.

[0052] like Figure 2 and Figure 3 As shown, the processing box 2 includes a box body, a photosensitive drum 21, a developing roller 22, a charging roller 23, a powder knife 24, and a stirring member 28. The stirring member 28 thoroughly mixes the toner and the carrier to form a developer. The photosensitive drum 21 is rotatably mounted on the box body, and the developing roller 22 is rotatably mounted on the box body and arranged parallel to the photosensitive drum. The charging roller 23 is rotatably mounted on the box body and arranged parallel to the photosensitive drum. The rotation axes of the photosensitive drum 21 and the developing roller 22 are parallel and rotate in opposite directions. The powder knife 24 is arranged along the axis of the developing roller 22 and is maintained in a position to form a fixed width gap with the surface of the developing roller 22. After the developing roller 22 is charged, the surface can absorb the developer to form a developer layer. The developer layer has uneven thickness when it is not treated. After the gap between the powder knife 203 and the surface of the developing roller 202 is treated, it becomes a uniform thickness. The surface of the photosensitive drum 21 is scanned by the laser scanning unit 3 to form an electrostatic latent image. The electrostatic latent image area of ​​the photosensitive drum 21 absorbs the toner on the surface of the developing roller 22 to form a toner image on the surface of the photosensitive drum 205.

[0053] During the process of forming a toner image on the photosensitive drum surface, both the charging roller 23 and the developing roller 22 need to be connected to the high voltage on the image forming apparatus body. The charging roller 23 includes a conductive charging roller shaft 27, which is electrically connected to a high-voltage contact 38 on the image forming apparatus body via a third conductive member 30. The developing roller 22 includes a conductive developing roller shaft 26, the end of which directly contacts a high-voltage contact 39 on the image forming apparatus body, forming an electrical connection.

[0054] When printing begins, the charging roller 23 connects to the high voltage of the image forming device and charges the surface of the photosensitive drum 21 with high voltage. The laser scanning unit 3 then emits laser light onto the surface of the photosensitive drum 21 based on the data signal sent by the image forming device's control unit. The resistance of the area of ​​the photosensitive drum 21 exposed to the laser light decreases, and the charge in the area of ​​the photosensitive drum 21 exposed to the laser light is then conducted to the grounded conductive sheet 37 via the second conductive member 25 disposed inside the photosensitive drum 21. Areas of the photosensitive drum 21 not exposed to the laser light still carry a positive charge, ultimately forming a latent image composed of positive charges on the surface of the photosensitive drum. The image forming device applies a bias voltage to the developing roller 22 by directly contacting the end of the developing roller 22 via the high-voltage contact 39. This creates a potential difference between the surface of the photosensitive drum 21 and the developing roller 22, causing negatively charged toner to be attracted to the surface of the photosensitive drum 21, thereby forming a toner image on the surface of the photosensitive drum 21.

[0055] like Figure 3 and Figure 4 As shown, the processing box 2 also includes an end cover 31. The end cover 21 is fixed to the box body of the processing box 2. The end cover 31 is provided with a first mounting hole 33 and a second mounting hole 32. The developing roller shaft 26 of the developing roller 22 is installed in the first mounting hole 33 of the end cover 31, and the end of the developing roller shaft 26 is flush with the side surface 311 of the end cover 31. The end cover 31 has a recess 312, and the second mounting hole 32 is provided in the recess 312 of the end cover 31. The third conductive member 30 is fixed to the box body of the processing box 2 by screws. The second contact portion 301 of the third conductive member 30 passes through the second mounting hole 32 of the end cover 31, and the third contact portion of the third conductive member 30 contacts the end of the charging roller 23, thereby realizing that the image forming device 1 applies high voltage to the charging roller 23.

[0056] like Figure 5 As shown, the process cartridge 2 also includes a chip 35. The body of the process cartridge 2 is provided with a third mounting hole 34. The chip 35 is enclosed within the process cartridge 2, and a first conductive member 29 is embedded in the process cartridge to communicate with the chip 35. The first contact portion 291 of the first conductive member 29 is exposed to the surface of the process cartridge 2 through the third mounting hole 34 in the body, and contacts a grounding component provided on the image forming apparatus 1.

[0057] In order to ensure that the first conductive member 29, the second conductive member 25, the third conductive member 30 of the process cartridge 2 and the end of the developing roller 22 form a good electrical connection with the image forming device 1, thereby preventing defects in image formation, the distance L1 from any point of the first conductive member 29 to the second conductive member is smaller than the distance L2 from any point of the first conductive member 29 to the third conductive member 30, and the distance L3 from any point of the first conductive member 29 to the end of the second conductive sheet of the developing roller 22 on the same side is smaller than L1. <L2<L3。

[0058] In one embodiment, the first conductive member 29 is stamped from a whole piece of conductive plate, and includes a first contact portion 291 located in the middle section, and a first clamping portion 292 and a second clamping portion 296 respectively bent at both ends of the first contact portion 291. A third mounting hole is provided on the box body for the first conductive member 291 to pass through.

[0059] In one embodiment, if Figure 5 、 Figure 6 and Figure 7 The first conductive member 29 is formed by stamping and bending a single piece of conductive material into a "J"-shaped structure. The first contact portion 291 in the middle is flat. The end of the first clamping portion 292 is bent to form a first bent portion 294. The end of the second clamping portion 296 is bent to form a second bent portion 295. The middle section of the first clamping portion 292 has a stamped elastic arm 293.

[0060] The second bent portion 295 is hooked upward and locked to the inner surface of the box body, and the elastic arm 293 is protruded outward and locked in the locking portion of the box body. The locking forces of the second bent portion 295 and the elastic arm 293 are opposite.

[0061] The first bent portion 294 abuts against the chip 35 , thereby establishing an electrical connection with the chip 35 .

[0062] Optionally, the first bent portion 294 has a plane at the portion abutting against the chip 35 , and abuts against the surface of the chip 35 under the elastic action of the material, thereby improving the stability of the connection.

[0063] In one embodiment, the conductive structure of the photosensitive drum 21 includes a second conductive member 25 and a conductive steel shaft 36 disposed on the image forming apparatus body. The inner wall of the photosensitive drum 21 is connected to the conductive steel shaft 36 via the second conductive member 25. The end of the conductive steel shaft 36 is connected to the grounding structure of the image forming apparatus 1, thereby grounding the photosensitive drum 21.

[0064] like Figure 9As shown, the main body of the second conductive member 25 of the photosensitive drum 21 is annular. The hollow area in the middle of the ring is for the conductive steel shaft 36 to pass through. There is a spring 251 extending from the outer edge of the ring. The spring 251 is bent toward the axis. When the conductive steel shaft 36 passes through, the spring 251 abuts against the circumferential surface of the conductive steel shaft 251 due to its own elasticity. The outer edge of the second conductive member 25 is also provided with a clamping portion 252. The end of the clamping portion 252 contacts the inner wall of the photosensitive drum 21, thereby achieving the positive charge on the surface of the photosensitive drum 21 being conducted to the grounding structure of the image forming device 1 through the second conductive member 25 and the conductive steel shaft 36.

[0065] Optional, such as Figure 8 As shown, a conductive steel shaft 36 is mounted on the main body of the image forming apparatus and contacts the main body's metal sheet via a Z-shaped conductive grounding piece 37, thereby conducting away the positive charge on the surface of the photosensitive drum 21. The Z-shaped grounding piece 37 is elastic, with one end fixed to the main body's metal sheet by a screw, and the other end elastically crimped onto the end of the conductive steel shaft 36.

[0066] In one embodiment, if Figure 10 As shown, the third conductive member 30 is fixed to the box body of the processing box 2 by screws, and has a second contact portion 301 and a third contact portion 302, wherein the second contact portion 301 passes through the second mounting hole 32 of the end cover 31, and the third contact portion of the third conductive member 30 contacts the end of the charging roller 23, thereby enabling the image forming device 1 to apply high voltage to the charging roller 23.

[0067] Another aspect of the present invention is as follows Figure 11 As shown, an image forming device 1 includes a main body and the aforementioned processing box 2 installed in the main body, and a high-voltage contact is provided on the main body. It is characterized in that when the processing box is installed to the main body, the high-voltage contact 38 is electrically connected to the second contact portion 301 of the third conductive member 30 of the processing box 2, and the high-voltage contact 39 is electrically connected to the end of the developing roller 22 of the processing box 2.

[0068] Furthermore, the body of the image forming apparatus 1 is provided with a grounding component. When the process cartridge is mounted to the body, the grounding component is electrically connected to the first conductive member 29 .

[0069] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A process cartridge, detachably mounted in an image forming apparatus, comprising a cartridge body; a photosensitive drum rotatably mounted on the cartridge body; A developing roller, which is rotatably mounted on the box body and arranged parallel to the photosensitive drum, and includes a developing roller shaft; The charging roller is rotatably mounted on the box body and arranged parallel to the photosensitive drum, including a charging roller shaft A first conductive member is provided at one end of the box body in the longitudinal direction; a second conductive member, disposed at one end of the photosensitive drum in a direction opposite to the first conductive member; a third conductive member, provided on the box body in a direction opposite to the first conductive member, and in contact with an end portion of the charging roller shaft; It is characterized by: The distance L1 from any point of the first conductive member to the second conductive member, the distance L2 from any point of the first conductive member to the third conductive sheet, and the distance L3 from any point of the first conductive member to the end surface of the developing roller shaft satisfy the following relationship: L1 <L2<L3。 2. The process cartridge according to claim 1, wherein The processing box also includes an end cover, which is provided with a first mounting hole, a second mounting hole and a recess, the second mounting hole is provided in the recess, the first mounting hole cooperates with the developing roller shaft, and the second mounting hole cooperates with the third conductive member.

3. The process cartridge according to claim 1, wherein The processing box further includes a chip, which is mounted on the box body and connected to the first conductive member.

4. The process cartridge according to claim 1, wherein The box body is provided with a third mounting hole for the first conductive member to pass through.

5. The process cartridge according to claim 3, wherein: The first conductive member is in communication with the chip and has a first contact portion exposed to the surface of the process box.

6. The process cartridge according to claim 1, wherein The second conductive member has a clamping portion, and the clamping portion contacts the inner wall of the photosensitive drum.

7. The process cartridge according to claim 1, wherein The third conductive member is connected to the charging roller and has a second contact portion exposed on the surface of the process box.

8. An image forming device comprising a main body and a process cartridge according to any one of claims 1 to 7 installed in the main body, wherein the main body is provided with a high-voltage contact, characterized in that: When the process cartridge is mounted to the body, one of the high-voltage contacts is electrically connected to the second contact portion of the third conductive member of the process cartridge, and the other of the high-voltage contacts is electrically connected to the end of the developing roller of the process cartridge.

9. The image forming apparatus according to claim 8, wherein The body is provided with a grounding component, and when the process cartridge is mounted to the body, the grounding component is electrically connected to the first conductive member.

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