Non-contact developing roller

Abstract

The application relates to the technical field of developing rollers, and discloses a non-contact developing roller, which comprises a mounting shell and a motor one, the inner wall of the mounting shell is rotationally connected with a carbon powder roller, the outer surface of the carbon powder roller is rotationally connected with a connecting piece one, and the inner wall of the connecting piece one is rotationally connected with a developing roller. The non-contact developing roller is provided with the connecting piece one, a worm, a worm wheel and other components. When the gap between the developing roller and a photosensitive drum changes due to thermal expansion, the motor one is started to drive the worm to rotate, the worm wheel is driven to rotate through the worm, the connecting piece one can rotate through the connection between the worm wheel and the connecting piece one, the connecting piece one drives the developing roller to slide on the inner wall of the limiting cylinder, the developing roller can make a circular motion with the center of the carbon powder roller as the center, the developing roller can approach or move away from the photosensitive drum, the gap between the developing roller and the photosensitive drum can be finely adjusted, and the gap change caused by thermal expansion and the like can be compensated.

Description

Technical Field

[0001] This application relates to the field of developing roller technology, specifically a non-contact developing roller. Background Technology

[0002] The developing roller is a core component in electronic imaging equipment such as laser printers and copiers. It is responsible for accurately transferring toner to the surface of the photosensitive drum to form a visible image. Its structure is usually composed of a metal core, a conductive elastic layer and a surface coating. By developing bias voltage, the surface of the roller is charged, adsorbing charged toner in the toner cartridge, and transferring the toner according to the electrostatic latent image distribution by means of contact friction between the elastic layer and the photosensitive drum.

[0003] Among existing developing rollers, it is found that they are usually equipped with contact developing rollers and non-contact developing rollers. Contact developing rollers are prone to wear, so non-contact developing rollers are usually used. However, when existing non-contact developing rollers are in use, the gap between the developing roller and the photosensitive drum usually changes due to thermal expansion, which affects the image density and can easily lead to local areas being too light or too dark. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a non-contact developing roller, which has the advantages of facilitating fine-tuning of the gap between the developing roller and the photosensitive drum, thereby compensating for gap changes caused by thermal expansion, etc. This solves the problem that existing non-contact developing rollers often experience gap changes between the developing roller and the photosensitive drum due to thermal expansion during use, affecting image density and easily leading to localized areas that are too light or too dark.

[0005] To achieve the above objectives, this application provides the following technical solution: a non-contact developing roller, comprising a mounting shell and a motor, wherein a toner roller is rotatably connected to the inner wall of the mounting shell, a connector is rotatably connected to the outer surface of the toner roller, a developing roller is rotatably connected to the inner wall of the connector, the developing roller comprising a roller body, the outer surface of the roller body being covered with hard rubber, and the outer surface of the hard rubber being covered with soft rubber, a limit cylinder is fixedly connected to both the front and back of the mounting shell, a worm gear is fixedly connected to the output shaft of the motor, a worm wheel meshes with the outer surface of the worm gear, the inner wall of the worm wheel is fixedly connected to the outer surface of the connector, a photosensitive drum is rotatably mounted on the inner wall of the mounting shell, a retainer is rotatably connected to the outer surface of the worm gear, and the back of the retainer is fixedly connected to the front of the mounting shell.

[0006] In this scheme, to facilitate fine-tuning of the developing roller's position and compensate for gap changes caused by thermal expansion, the toner roller is positioned on the inner wall of the mounting housing and is configured to rotate. A motor is positioned on the front of the mounting housing, and a worm gear is mounted on the output shaft of the motor. A worm wheel is mounted on the side of the worm gear, and the worm gear and worm wheel are connected. The rotation of the worm gear allows the worm wheel to rotate. The photosensitive drum is positioned on the inner wall of the mounting housing and is also configured to rotate. A connector is placed between the toner roller and the developing roller to ensure that the distance between them does not change. The worm wheel is connected to the connector. When the gap between the developing roller and the photosensitive drum changes due to thermal expansion, the toner roller is adjusted accordingly. The motor drives the worm gear to rotate, which in turn drives the worm wheel to rotate, which in turn drives the connecting part to rotate. This, in turn, drives the developing roller to rotate. At this time, the developing roller makes a circular motion around the center of the toner roller, allowing it to move closer to or further away from the photosensitive drum. This facilitates fine-tuning of the gap between the developing roller and the photosensitive drum, thereby compensating for gap changes caused by thermal expansion. The developing roller consists of a roller body, hard rubber, and soft rubber. The hard rubber wraps around the roller body, and the soft rubber wraps around the hard rubber. The inner hard rubber has a higher hardness, which can effectively transmit torque and prevent slippage from affecting the developing efficiency. The outer soft rubber is soft and can form a uniform and appropriate pressure distribution when in contact with the photosensitive drum, improving the developing quality.

[0007] Furthermore, a mounting bracket one is fixedly connected to the front of the mounting shell, and a mounting bracket two is fixedly connected to the back of the mounting shell.

[0008] With the above scheme, mounting bracket one is installed on the front of the mounting shell and set as a fixed connection to support mounting bracket one. Mounting bracket two is installed on the back of the mounting shell and is also set as a fixed connection to support mounting bracket two.

[0009] Furthermore, a mounting block is fixedly connected to the front of the mounting bracket, and the inner wall of the mounting block is fixedly connected to the outer surface of the motor.

[0010] The above method involves installing the mounting block on the front of the mounting frame and setting a fixed connection between them to achieve the installation of the mounting block. The mounting block is then connected to the surface of the motor to support the motor and ensure its stable operation.

[0011] Furthermore, two limiting discs are fixedly connected to the outer surface of the developing roller.

[0012] The above solution involves installing two limiting discs on the surface of the developing roller. The surface of the limiting discs contacts the inner wall of the mounting shell, which can block the position of the limiting cylinder and prevent the developing roller from moving.

[0013] Furthermore, a second motor is fixedly connected to the upper surface of the second mounting bracket, and the output shaft of the second motor is fixedly connected to the inner wall of the toner roller.

[0014] The above scheme involves mounting motor 2 on the upper surface of mounting bracket 2 and establishing a fixed connection between them. Mounting bracket 2 supports motor 2, and the inner wall of the toner roller is connected to the output shaft of motor 2, enabling the toner roller to rotate.

[0015] Furthermore, a second connector is rotatably connected to the outer surface of the toner roller, and the inner wall of the second connector is rotatably connected to the outer surface of the developing roller.

[0016] With the above solution, connector 2 is installed on the outer surface of the toner roller and set as a rotatable connection to limit the position of connector 2. Connector 2 is also connected to the developing roller. With connector 1 and connector 2, the distance between the toner roller and the developing roller can be guaranteed to remain unchanged.

[0017] Furthermore, a pulley is fixedly connected to the outer surface of the toner roller, and a synchronous belt meshes with the outer surface of the pulley.

[0018] The above method involves mounting pulley one on the surface of the toner roller, fixing the toner roller to pulley one, and placing the timing belt on the surface of pulley one, thus engaging pulley one with the timing belt.

[0019] Furthermore, the inner wall of the synchronous belt is engaged with a second pulley, and the inner wall of the second pulley is fixedly connected to the outer surface of the developing roller.

[0020] With the above scheme, pulley two is set on the inner wall of the synchronous belt and meshes with it. When pulley one rotates, it is driven by the synchronous belt, which in turn enables pulley two to rotate. Pulley two enables the developing roller to rotate, which in turn enables motor two to drive the toner roller to rotate. The developing roller can then follow the toner roller and rotate in the same direction.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects: This non-contact developing roller, through the inclusion of a connector, worm gear, and worm wheel, allows the developing roller to rotate when thermal expansion causes a change in the gap between it and the photosensitive drum. Motor 1 is activated, causing the worm gear to rotate, which in turn rotates the worm wheel. The worm wheel's connection to connector 1 allows connector 1 to rotate, which in turn drives the developing roller to slide along the inner wall of the limiting cylinder. This allows the developing roller to move in a circular motion around the center of the toner roller, moving it closer to or further away from the photosensitive drum. This facilitates fine-tuning of the gap between the developing roller and the photosensitive drum, compensating for gap changes caused by thermal expansion. Motor 2 rotates pulley 1, and a synchronous belt enables pulleys 1 and 2 to rotate in the same direction. The synchronous belt ensures that the toner roller and developing roller always rotate synchronously, regardless of how the developing roller's position is adjusted. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the entire application; Figure 2 This is the overall main view structure diagram of this application; Figure 3 This is a structural diagram showing the connection relationship between the worm and the worm wheel in this application; Figure 4 This is a structural diagram showing the connection relationship between pulley one and the timing belt in this application; Figure 5 This is a structural diagram showing the connection relationship between the developing roller and the limiting disk in this application; Figure 6 This is a cross-sectional structural diagram of the developing roller in this application.

[0023] In the picture: 1. Mounting housing; 2. Limiting cylinder; 3. Toner roller; 4. Developing roller; 401. Roller body; 402. Hard rubber; 403. Soft rubber; 5. Connector 1; 6. Motor 1; 7. Worm gear; 8. Worm wheel; 9. Cage; 10. Photosensitive drum; 11. Mounting bracket 1; 12. Mounting block; 13. Mounting bracket 2; 14. Limiting disc; 15. Connector 2; 16. Motor 2; 17. Pulley 1; 18. Pulley 2; 19. Synchronous belt. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 , Figure 3 and Figure 6This embodiment of a non-contact developing roller includes a mounting shell 1 and a motor 6. A toner roller 3 is rotatably connected to the inner wall of the mounting shell 1, and a connector 5 is rotatably connected to the outer surface of the toner roller 3. A developing roller 4 is rotatably connected to the inner wall of the connector 5. The developing roller 4 includes a roller body 401, the outer surface of which is covered with hard rubber 402, and the outer surface of the hard rubber 402 is covered with soft rubber 403. Limiting cylinders 2 are fixedly connected to both the front and back of the mounting shell 1. A worm gear 7 is fixedly connected to the output shaft of the motor 6. A worm wheel 8 meshes with the outer surface of the worm gear 7. The inner wall of the worm wheel 8 is fixedly connected to the outer surface of the connector 5. A photosensitive drum 10 is rotatably mounted on the inner wall of the mounting shell 1. A retainer 9 is rotatably connected to the outer surface of the worm gear 7. The back of the retainer 9 is fixedly connected to the front of the mounting shell 1.

[0026] Please see Figure 2 , Figure 3 and Figure 4 Mounting housing 1 has a mounting bracket 11 fixedly connected to the front and a mounting bracket 2 13 fixedly connected to the back. Mounting bracket 11 is installed on the front of mounting housing 1 and is fixedly connected to support mounting bracket 11. Mounting bracket 2 13 is installed on the back of mounting housing 1 and is also fixed to support mounting bracket 2 13.

[0027] Please see Figure 2 and Figure 3 Mounting bracket 11 has a mounting block 12 fixedly connected to its front side. The inner wall of mounting block 12 is fixedly connected to the outer surface of motor 6. Mounting block 12 is installed on the front side of mounting bracket 11, and a fixed connection is made between them to realize the installation of mounting block 12. Mounting block 12 is connected to the surface of motor 6. By connecting mounting block 12 to motor 6, the motor 6 is supported, ensuring the stable operation of motor 6.

[0028] Please see Figure 4 and Figure 5 Two limiting discs 14 are fixedly connected to the outer surface of the developing roller 4. The two limiting discs 14 are installed on the surface of the developing roller 4. The surface of the limiting discs 14 contacts the inner wall of the mounting shell 1, which can block the position of the limiting cylinder 2 and prevent the developing roller 4 from moving.

[0029] Please see Figure 4 A motor 16 is fixedly connected to the upper surface of the mounting frame 13. The output shaft of the motor 16 is fixedly connected to the inner wall of the toner roller 3. The motor 16 is mounted on the upper surface of the mounting frame 13 and fixedly connected to it. The mounting frame 13 supports the motor 16 and connects the inner wall of the toner roller 3 to the output shaft of the motor 16, so that the toner roller 3 can rotate.

[0030] Please see Figure 4 A second connector 15 is rotatably connected to the outer surface of the toner roller 3. The inner wall of the second connector 15 is rotatably connected to the outer surface of the developing roller 4. The second connector 15 is installed on the outer surface of the toner roller 3 and is configured as a rotatable connection to limit the position of the second connector 15 and connect the second connector 15 to the developing roller 4. The first connector 5 and the second connector 15 can ensure that the distance between the toner roller 3 and the developing roller 4 does not change.

[0031] Please see Figure 4 A pulley 17 is fixedly connected to the outer surface of the toner roller 3. A timing belt 19 is engaged with the outer surface of the pulley 17. The pulley 17 is installed on the surface of the toner roller 3, the toner roller 3 is fixed to the pulley 17, and the timing belt 19 is placed on the surface of the pulley 17, and the pulley 17 and the timing belt 19 are engaged.

[0032] Please see Figure 4 The inner wall of the synchronous belt 19 is engaged with a pulley 18. The inner wall of the pulley 18 is fixedly connected to the outer surface of the developing roller 4. The pulley 18 is set on the inner wall of the synchronous belt 19 and is engaged. When the pulley 17 rotates, it is driven by the synchronous belt 19, which in turn enables the pulley 18 to rotate. The pulley 18 enables the developing roller 4 to rotate, which in turn enables the motor 16 to drive the toner roller 3 to rotate. The developing roller 4 can then follow the toner roller 3 and rotate in the same direction.

[0033] In this embodiment, a non-contact developing roller is provided with components such as a connector 5, a worm gear 7, and a worm wheel 8. When the gap between the developing roller 4 and the photosensitive drum 10 changes due to thermal expansion, the motor 6 is started to rotate the worm gear 7, which in turn rotates the worm wheel 8. The worm wheel 8 is connected to the connector 5, allowing the connector 5 to rotate. This causes the connector 5 to drive the developing roller 4 to slide on the inner wall of the limiting cylinder 2, enabling the developing roller 4 to move in a circular motion around the center of the toner roller 3. This allows the developing roller 4 to move closer to or further away from the photosensitive drum 10, facilitating fine-tuning of the gap between the developing roller 4 and the photosensitive drum 10, thereby compensating for gap changes caused by thermal expansion. The motor 16 rotates the pulley 17, and the synchronous belt 19 enables the pulleys 17 and 18 to rotate in the same direction. With the synchronous belt 19, the toner roller 3 and the developing roller 4 can always rotate synchronously, regardless of how the developing roller 4 is adjusted.

[0034] It should be noted that the setting of the limiting cylinder 2 allows the developing roller 4 to slide on the inner wall of the limiting cylinder 2, providing movement space for the developing roller 4, and can limit the developing roller 4 so that the developing roller 4 can only move inside the limiting cylinder 2. The setting of the retainer 9 can ensure that the worm 7 is always connected to the worm wheel 8.

[0035] The working principle of the above embodiments is as follows: When the gap between the developing roller 4 and the photosensitive drum 10 changes due to thermal expansion, firstly, motor 6 is started to rotate the worm gear 7. The retainer 9 limits the worm gear 7, which in turn causes the worm wheel 8 to rotate. The worm wheel 8 drives the connecting piece 5 to rotate, which in turn causes the connecting piece 5 to slide the developing roller 4 on the inner wall of the limiting cylinder 2. This allows the developing roller 4 to move in a circular motion around the center of the toner roller 3, enabling it to move closer to or further away from the photosensitive drum 10. This facilitates fine-tuning of the gap between the developing roller 4 and the photosensitive drum 10, thus compensating for gap changes caused by thermal expansion. Motor 16 then rotates the pulley 17, which in turn... The timing belt 19 enables pulley 17 and pulley 18 to rotate in the same direction. Through the timing belt 19, the toner roller 3 and the developing roller 4 can always rotate synchronously, regardless of how the developing roller 4 is adjusted. The developing roller 4 includes a roller body 401, hard rubber 402, and soft rubber 403. The hard rubber 402 wraps around the roller body 401, and the soft rubber 403 wraps around the hard rubber 402. The inner hard rubber 402 has a higher hardness, which can effectively transmit torque and avoid affecting the developing efficiency due to slippage. The outer soft rubber 403 is soft and can form a uniform and appropriate pressure distribution when in contact with the photosensitive drum 10, thereby improving the developing quality.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-contact developing roller, comprising a mounting housing (1) and a motor (6), characterized in that: The inner wall of the mounting housing (1) is rotatably connected to a toner roller (3), the outer surface of the toner roller (3) is rotatably connected to a connector (5), the inner wall of the connector (5) is rotatably connected to a developing roller (4), the developing roller (4) includes a roller body (401), the outer surface of the roller body (401) is covered with hard rubber (402), the outer surface of the hard rubber (402) is covered with soft rubber (403), the front and back of the mounting housing (1) are fixedly connected to limit cylinders (2), the output shaft of the motor (6) is fixedly connected to a worm gear (7), the outer surface of the worm gear (7) is meshed with a worm wheel (8), the inner wall of the worm wheel (8) is fixedly connected to the outer surface of the connector (5), the inner wall of the mounting housing (1) is rotatably mounted to a photosensitive drum (10), the outer surface of the worm gear (7) is rotatably connected to a retainer (9), the back of the retainer (9) is fixedly connected to the front of the mounting housing (1).

2. The non-contact developing roller according to claim 1, characterized in that: Mounting bracket one (11) is fixedly connected to the front of the mounting shell (1), and mounting bracket two (13) is fixedly connected to the back of the mounting shell (1).

3. A non-contact developing roller according to claim 2, characterized in that: The mounting bracket (11) is fixedly connected to the front of the mounting block (12), and the inner wall of the mounting block (12) is fixedly connected to the outer surface of the motor (6).

4. A non-contact developing roller according to claim 1, characterized in that: Two limiting discs (14) are fixedly connected to the outer surface of the developing roller (4).

5. A non-contact developing roller according to claim 2, characterized in that: The upper surface of the mounting bracket 2 (13) is fixedly connected to the motor 2 (16), and the output shaft of the motor 2 (16) is fixedly connected to the inner wall of the toner roller (3).

6. A non-contact developing roller according to claim 1, characterized in that: The outer surface of the toner roller (3) is rotatably connected to a second connector (15), and the inner wall of the second connector (15) is rotatably connected to the outer surface of the developing roller (4).

7. A non-contact developing roller according to claim 1, characterized in that: The outer surface of the toner roller (3) is fixedly connected to a pulley (17), and the outer surface of the pulley (17) is engaged with a synchronous belt (19).

8. A non-contact developing roller according to claim 7, characterized in that: The inner wall of the synchronous belt (19) is engaged with a pulley (18), and the inner wall of the pulley (18) is fixedly connected to the outer surface of the developing roller (4).

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