Developing roller protection structure
Patent Information
- Application Number
- CN202522351962.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-06
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-11-06
AI Technical Summary
[0003]现有技术中是由弹性构造产生一定推力，把显影辊(Dev)压着在光鼓(OPC)上，所以显影辊会有一定量的变形存在，正常工作时，显影辊和光鼓都在旋转，不会使得显影辊产生变形，但是如果长时间不工作，显影辊的局部变形状态长时间保持，就会使显影辊产生塑性变形，影响后续打印的画像品质
当不需要使用硒鼓时，通过旋转螺纹旋接件，由于扩张锥件受到空腔壁的限制，螺纹旋接件只能驱动扩张锥件上移或下移，当扩张锥件上移时，弹簧会拉动第一轴杆和第二轴杆接近使显影辊和光鼓接触；当扩张锥件下移时，倾斜面逐渐下移推动第一轴杆和第二轴杆分离，使显影辊和光鼓分开，避免了长时间接触导致显影辊的局部变形，而影响后续打印画像品质的情况发生它具有结构简单、配合紧凑，设计合理等优点；因此，它是一种技术性和经济性均具有优越性能的产品。
Smart Images
Figure CN224651754U_ABST
Abstract
Description
[Technical Field] This utility model mainly relates to a protective structure for a developing roller. [Background Technology] The developing roller is mainly used in image forming devices that utilize electrophotography, such as copiers, printers, and fax machines. In these devices, the developing roller's function is to deliver the developer to the image carrier on which an electrostatic latent image is formed. Its performance directly affects the quality of the image forming device, especially the print density.
[0003] In existing technology, a certain amount of thrust is generated by an elastic structure to press the developing roller (Dev) onto the optical drum (OPC). Therefore, the developing roller will have a certain amount of deformation. During normal operation, both the developing roller and the optical drum are rotating, which will not cause the developing roller to deform. However, if it is not used for a long time, the local deformation state of the developing roller will remain for a long time, which will cause the developing roller to undergo plastic deformation and affect the image quality of subsequent printing. [Utility Model Content] To solve at least one of the above problems, this utility model proposes a new structural solution. The developing roller protection structure adopts the following technical solution: A developing roller protection structure includes a developing roller, a photodiode, and a separation mechanism, wherein the developing roller and the photodiode are arranged adjacent to each other, and the separation mechanism is located between the developing roller and the photodiode; The developing roller has a first shaft, the optical drum has a second shaft, and a spring connects the first shaft and the second shaft; The separation mechanism includes a threaded connector, an expansion cone, and a housing. The housing has a cavity, and the expansion cone is placed inside the cavity. The top of the housing has a through hole, through which the threaded connector enters the cavity and screws onto the expansion cone. The bottom of the housing is open, and the expansion cone is pushed out or retracted into the housing by rotating the threaded connector. The side of the expansion cone simultaneously pushes the first shaft and the second shaft to separate or contact the developing roller and the optical drum.
[0005] Preferably, the thickness of the cavity is adapted to the thickness of the expansion cone to restrict the rotation of the expansion cone through the housing.
[0006] Preferably, the expansion cone is provided with a screw hole for connection of threaded couplings.
[0007] Preferably, the side of the expanding cone is an inclined surface.
[0008] The beneficial effects of this utility model compared with the prior art are: When the toner cartridge is not in use, rotating the threaded connector causes the expansion cone to move upwards or downwards due to the constraint of the cavity wall. When the expansion cone moves upwards, the spring pulls the first and second shafts closer together, bringing the developing roller and the optical drum into contact. When the expansion cone moves downwards, the inclined surface gradually moves downwards, pushing the first and second shafts apart, separating the developing roller and the optical drum. This avoids prolonged contact that could cause localized deformation of the developing roller, affecting the quality of subsequent printed images. It has advantages such as simple structure, compact fit, and reasonable design; therefore, it is a product with superior performance in both technology and economy. [Attached Image Description] Figure 1 A first-view schematic diagram of the developing roller protection structure in a preferred embodiment of this utility model; Figure 2 This is a schematic diagram of the internal structure of the box in a preferred embodiment of the present utility model; Figure 3 This is a second-view schematic diagram of the developing roller protection structure in a preferred embodiment of the present invention.
Detailed Implementation Methods
[0011] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0012] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0013] The preferred embodiment provided by this utility model is as follows: Figures 1-3 As shown, a developing roller protection structure includes a developing roller 1, a light drum 2, and a separation mechanism 3. The developing roller 1 and the light drum 2 are arranged adjacent to each other, and the separation mechanism 3 is located between the developing roller 1 and the light drum 2. The developing roller 1 has a first shaft 11, and the optical drum 2 has a second shaft 21. The first shaft 11 and the second shaft 21 are connected by a spring 13. The separation mechanism 3 includes a threaded connector 31, an expansion cone 32, and a housing 33. The housing 33 has a cavity 34, and the expansion cone 32 is placed inside the cavity 34. The thickness of the cavity 34 is adapted to the thickness of the expansion cone 32 so as to restrict the rotation of the expansion cone 32 by the housing 33. The side of the expansion cone 32 is an inclined surface 35. As the expansion cone 32 gradually moves downward, the inclined surface 35 will gradually push away the developing roller 1 and the optical drum 2 on both sides.
[0014] The top of the box 33 is provided with a through hole 36, and the threaded connector 31 enters the cavity 34 through the through hole 36 and is screwed into the expansion cone 32; the expansion cone 32 is provided with a screw hole for the threaded connector 31 to connect, and the screw hole can vertically penetrate the expansion cone 32.
[0015] The bottom of the housing 33 is open, and the expansion cone 32 is rotated by the threaded connector 31 to push it out or retract into the housing 33. The side of the expansion cone 32 simultaneously pushes the first shaft 11 and the second shaft 21 to separate or contact the developing roller 1 and the optical drum 2.
[0016] Operating principle: The cartridge 33 can be fixed on the side cover of the toner cartridge. The toner cartridge can be provided with corresponding holes for the threaded connector 31 to connect. The threaded connector 31 is kept outside the toner cartridge. When the toner cartridge is not in use, by rotating the threaded connector 31, the expansion cone 32 is restricted by the wall of the cavity 34. The threaded connector 31 can only drive the expansion cone 32 to move up or down. When the expansion cone 32 moves up, the spring will pull the first shaft 11 and the second shaft 21 to approach each other, so that the developing roller 1 and the optical drum 2 come into contact. When the expansion cone 32 moves down, the inclined surface 35 gradually moves down, pushing the first shaft 11 and the second shaft 21 to separate, so that the developing roller 1 and the optical drum 2 are separated. This avoids the situation where the developing roller 1 is locally deformed due to long-term contact, which would affect the quality of subsequent printed images.
[0017] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0018] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.
Claims
1. A developing roller protection structure, characterized in that: It includes a developing roller, a photodiode, and a separation mechanism. The developing roller and the photodiode are arranged adjacent to each other, and the separation mechanism is located between the developing roller and the photodiode. The developing roller has a first shaft, the optical drum has a second shaft, and a spring connects the first shaft and the second shaft; The separation mechanism includes a threaded connector, an expansion cone, and a housing. The housing has a cavity, and the expansion cone is placed inside the cavity. The top of the housing has a through hole, through which the threaded connector enters the cavity and screws onto the expansion cone. The bottom of the housing is open, and the expansion cone is pushed out or retracted into the housing by rotating the threaded connector. The side of the expansion cone simultaneously pushes the first shaft and the second shaft to separate or contact the developing roller and the optical drum.
2. The developing roller protection structure according to claim 1, characterized in that: The thickness of the cavity is adapted to the thickness of the expansion cone to restrict the rotation of the expansion cone through the housing.
3. The developing roller protection structure according to claim 1, characterized in that: The expansion cone has a screw hole for threaded connection.
4. The developing roller protection structure according to claim 1, characterized in that: The side of the expansion cone is an inclined surface.