Drive coupling member and image forming apparatus

Abstract

The utility model discloses a driving connection part which comprises a body used for being connected with target equipment. The first driving structure is arranged on the body and used for being meshed with a target driving structure on target equipment; the first driving structure comprises a first meshing tooth part which is provided with a first surface used for abutting against a target driving structure so as to transmit rotation acting force through the first surface; wherein the first meshing tooth part is provided with a limiting structure used for abutting against the target driving structure, the limiting structure forms a second surface on the side, away from the first surface, of the first meshing tooth part, a second spacing distance can be formed between the second surface and the target driving structure, and the second spacing distance is set to be equal to or smaller than 0.5 mm; the technical problem that the speed of the photosensitive drum is unstable in the rotating process when the frictional resistance applied to the photosensitive drum by the developing roller exceeds the driving torque provided by the printer main body is solved, and the adverse effect on the selenium drum unit caused by the excessive displacement of the target driving structure is effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coupling components, and particularly relates to a driving coupling component and an image forming device. BACKGROUND

[0002] Image forming devices, such as laser printers, copiers and multifunction peripherals, are widely used in office, home and industrial environments to provide users with efficient and convenient document output solutions. One of the core components of these devices is the OPC drum, which undertakes the key task of converting image information from digital signals to physical toner images. The power transmission between the OPC drum and the printer body is realized through a driving head. Specifically, the built-in motor of the printer is connected to the corresponding interface of the OPC drum through the driving head, ensuring that the OPC drum can accurately perform the printing task as the motor operates.

[0003] In existing image forming devices, the design of the driving coupling component of the printer body and the driving coupling component of the OPC drum mainly focuses on the power transmission efficiency and stability during forward rotation. In order to ensure effective power transmission, the design of the driving surface must ensure sufficient contact area and appropriate friction coefficient to maintain good engagement during the starting moment and continuous operation. However, the structure design of the non-driving surface located in the opposite direction is often simplified, as shown in the accompanying drawings Figure 1 、 Figure 2 and Figure 3 , mainly to facilitate the rapid docking of the two during startup. Therefore, the non-driving surface is usually designed with a larger gap and adopts an inclined or curved surface structure, which not only helps to reduce unnecessary wear, but also ensures easy re-engagement after the device stops working.

[0004] Although the above design ensures the stability of the engagement between the printer body driving coupling component and the selenium drum driving coupling component to some extent, there are still some deficiencies in actual application. In particular, when the printer is working, the contact between the photosensitive drum and the developing roller and the rotation of the two in opposite directions will cause significant sliding friction between the two. If the friction coefficient between the developing roller and the photosensitive drum is too high, the frictional resistance exerted by the developing roller on the photosensitive drum can exceed the driving torque provided by the printer body. Since the non-driving surface of the printer body driving coupling component and the non-driving surface of the selenium drum driving coupling component have a first interval distance and do not have a function of effectively limiting the reverse displacement, the photosensitive drum is prone to speed instability during rotation. Such changes in speed not only affect the uniformity of toner distribution on the photosensitive drum, but also ultimately affect the printed documents, resulting in image quality degradation, such as blurred text edges, broken lines, or inconsistent colors. These problems seriously affect the user experience, so optimizing the design of the driving head to improve the printing quality has become a technical problem that must be solved. Utility model content

[0005] The application provides a driving coupling component to solve the technical problem that the frictional resistance exerted by the developing roller on the photosensitive drum exceeds the driving torque provided by the printer body, which easily leads to speed instability of the photosensitive drum during rotation. The limiting structure is provided on the first meshing part to form a second surface on the limiting structure, and the second surface can form a second interval distance with the target driving structure, so that the limiting structure can limit the maximum displacement distance of the target device in the first driving structure, thereby solving the technical problem.

[0006] To solve the above technical problem, the application provides a driving coupling component, which mainly comprises: a body for connecting with a target device; a first driving structure provided on the body for engaging with a target driving structure on the target device to enable the body to rotate synchronously with the target device; the first driving structure comprises: a first meshing part having a first surface for abutting on the target driving structure to transmit a rotating force through the first surface;

[0007] The first meshing part is provided with a limiting structure for abutting against the target driving structure, and the limiting structure forms a second surface on the side of the first meshing part away from the first surface. The second surface can form a second interval distance with the target driving structure, and the second interval distance is set to be equal to or less than 0.5 mm.

[0008] In some embodiments, the second surface is provided as a straight surface structure extending axially along the body to form the second interval distance with the target driving structure.

[0009] In some embodiments, the second surface comprises: a first region capable of forming a second spacing distance with the target driving structure for abutting against the target driving structure; and a second region capable of forming a third spacing distance with the target driving structure, the third spacing distance being greater than the second spacing distance.

[0010] In some embodiments, the limiting structure is integrally formed with the first toothed portion.

[0011] In some embodiments, the drive coupling member further comprises: a first connecting end disposed on the first end of the body, the first connecting end being formed with a first driving structure, and each first toothed portion being arranged along a circumferential direction of the first connecting end.

[0012] In some embodiments, the drive coupling member further comprises: a second connecting end disposed on a second end of the body opposite to the first end, for connecting with a driving device; and a second driving structure formed on the second connecting end, so that the body is capable of receiving a rotational driving force of the driving device through the second driving structure.

[0013] In some embodiments, the second driving structure comprises: a second toothed portion arranged along a circumferential direction of the second connecting end, and a slot formed between adjacent second toothed portions, so that the second driving structure is capable of being engaged with the driving device.

[0014] In some embodiments, the slot is a straight slot structure extending axially along the second connecting end, and each second toothed portion has a third surface and a fourth surface facing away from each other, the third surface being used for abutting against the driving device so that the body is capable of receiving the rotational driving force of the driving device, and the fourth surface being used for abutting against the driving device to limit a maximum displacement distance of the driving device in the slot.

[0015] In some embodiments, the body is provided with a transition region between the first connecting end and the second connecting end, the transition region being a tapered structure gradually narrowing from the second end of the body to the first end.

[0016] The present application also provides an image forming apparatus comprising a driving device connected with the aforementioned drive coupling member.

[0017] By the technical solution, the driving coupling component is provided. The limiting structure is arranged on the first tooth part to form the second surface on the limiting structure. The second surface can form the second interval distance with the target driving structure. The engagement between the target driving structure and the driving coupling component is more closely and stably. The limiting structure can effectively prevent the excessive displacement of the target driving structure, thereby reducing the adverse effects of the sliding friction on the selenium drum unit. Since the limiting structure limits the maximum distance of the reverse displacement of the target driving structure, the sliding friction between the photosensitive drum and the developing roller is effectively controlled. Thus, the problem of unstable rotation speed of the photosensitive drum caused by the excessively high friction coefficient can be avoided, thereby ensuring that the toner is more evenly distributed in the printing process and improving the printing quality. Through the above improvement measures, the problems of blurred text edges, broken lines or inconsistent colors that may occur in the printing process can be significantly improved. Users can obtain clearer and higher quality printed documents, thereby improving the use experience. In summary, the application provides an effective solution. Through simple structural improvement, the engagement performance between the driving coupling component and the target device is significantly improved, the printing quality and the reliability of the device are optimized, and the application has important practical value and market prospect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A perspective view of a driving coupling component driving a selenium drum unit in the prior art;

[0019] Figure 2 An exploded view of the driving coupling component in the prior art;

[0020] Figure 3 A structural view of the driving coupling component in the prior art;

[0021] Figure 4 A structural view of the driving coupling component according to the first embodiment of the application;

[0022] Figure 5 A structural view of the driving coupling component according to the second embodiment of the application.

[0023] REFERENCE SIGNS:

[0024] 1, the body;

[0025] 11, the first connecting end; 12, the second connecting end; 13, the transition area;

[0026] 111, the first tooth part; 112, the limiting structure; 121, the second tooth part; 122, the slot; 123, the locking tongue;

[0027] 111a, first surface; 111b, second surface; 111c, first region; 111d, second region; 121a, third surface; 121b, fourth surface; 122a, notch; 123a, limiting protrusion;

[0028] 2, target device; 21, target driving structure;

[0029] 3, selenium drum unit;

[0030] L1, first interval distance;

[0031] L2, second interval distance;

[0032] L3, third interval distance. DETAILED DESCRIPTION

[0033] The application will be further described in detail below with reference to the accompanying drawings.

[0034] Referring to Figures 1 to 3 As shown in the drawings, the application proposes a driving coupling component, which can include: a body 1 for connecting a target device 2, the body 1 being capable of transmitting driving force to the target device 2 to make the target device 2 enter a working state, it is necessary to explain that the target device 2 in the application can be a working state of rotating by itself, and in the embodiment the target device 2 can be a driving connector connected to the selenium drum unit 3 in the printer. A first driving structure is provided on the body 1, and the first driving structure can be engaged with a target driving structure 21 on the target device 2 to enable the body 1 to drive the target device 2 to rotate synchronously with the body 1 when the body 1 rotates, thereby transmitting the rotating force to the selenium drum unit 3. The first driving structure can be composed of two or more first engaging teeth 111 to be able to form an engaging relationship with the target driving structure 21, and the first engaging teeth 111 have a first surface 111a and a second surface 111b; it should be noted that when the body 1 drives the target device 2 to rotate through the first driving structure, the first surface 111a is used to abut on the target driving structure 21 to transmit the rotating force, and the second surface 111b faces in the direction opposite to the rotating direction of the body 1, and through the principle of rotational inertia the second surface 111b can form a first interval distance L1 with the target driving structure 21, and in the prior art the first interval distance L1 is greater than 0.5mm.

[0035] Referring to Figure 4As shown, in some embodiments, the technical key point of the present application is that the first engaging part 111 is provided with a limiting structure 112 capable of filling the first interval distance L1, so as to form a second surface 111b for abutting against the target driving structure 21 by the limiting structure 112, and the second surface 111b and the target driving structure 21 form a second interval distance L2, which is equal to or less than 0.5 mm. In the present application, after the target device 2 is separated or broken away from the inertial force in some cases, the limiting structure 112 can abut against the target driving structure 21 to limit the rotation deviation of the target device 2 within the range of the second interval distance L2; so as to ensure stable engagement while preventing the friction force of the developing roller in the selenium drum unit 3 on the photosensitive drum from being too large to cause the rotation speed to lose control, so as to improve the print image quality.

[0036] First embodiment

[0037] Reference Figure 4 As shown, in one embodiment, the second surface 111b can be provided as a straight surface structure extending axially along the body 1, and the second surface 111b can be perpendicular to the structure of the body 1. It needs to be explained that in the present embodiment, when the body 1 drives the target device 2 to be in a normal working state, the minimum interval distance between the second surface 111b and the target driving structure 21 is the second interval distance L2; and in some cases, the second surface 111b can be in contact with the target driving structure 21, so as to limit the displacement distance of the target driving structure 21 by the limiting structure 112, for example: when the friction force of the developing roller in the selenium drum unit 3 on the photosensitive drum is too large, the limiting structure 112 can be limited to ensure that the driving connecting part connected to the printer driving device can effectively control the rotation speed of the photosensitive drum through the driving joint on the selenium drum unit 3.

[0038] Second embodiment

[0039] Reference Figure 5As shown, in another embodiment, the second surface 111b can also be provided with other structures, such as a slope structure, or a stepped structure, etc., as long as the partial region of the second surface 111b can form the second interval distance L2 with the target driving structure 21 in the normal working state of the application, and the partial region can limit the target driving structure 21. In the embodiment, the second surface 111b can include a first region 111c and a second region 111d. In the normal working state of the application, the first region 111c can form the second interval distance L2 with the target driving structure 21, and the second region 111d can form a third interval distance L3 with the target driving structure 21, the third interval distance L3 is greater than the second interval distance L2, and the third interval distance L3 is less than the first interval distance L1; so that in some special cases, the first region 111c on the limiting structure 112 can limit the displacement of the target driving structure 21 in a limiting manner. In order to make the limiting structure 112 more effectively limit the target driving structure 21, the first tooth part 111 can be divided into a top part and a root part. The top part can be explained as the outer end part of the first tooth part 111 away from the body 1, and the root part can be explained as the connecting part of the first tooth part 111 close to the body 1; so that the first region 111c can be arranged at the position close to the top part of the first tooth part 111 on the second surface 111b, and the second region 111d can be arranged at the position close to the root part of the first tooth part 111 on the second surface 111b.

[0040] It should be noted that the limiting structure 112 can be connected to the first tooth part 111 by welding or bonding and other fixed connection methods. In the embodiment, the limiting structure 112 is integrally formed with the first driving structure to improve the stability of the limiting structure 112 and the first driving structure.

[0041] Referring to Figure 3As shown, in some embodiments, the driving coupling component is a shaft component, thus, has a first end and a second end on the body 1, and is provided with a first connecting end head 11 on the first end and a second connecting end head 12 on the second end on the body 1. The first driving structure is formed on the first connecting end head 11, so that the first connecting end head 11 is used for connecting the target device 2, and each first tooth part 111 can be uniformly arranged along the circumference of the first connecting end head 11, so that the rotating force on the body 1 can be uniformly transmitted to the target device 2. And the second connecting end head 12 is formed with a second driving structure, and the second driving structure can be composed of two or more than two second tooth parts 121, and the second connecting end head 12 can be used to connect the driving device (not shown in the figure) on the printer, so that the body 1 can be driven by the driving device through the second connecting end head 12 to rotate; each second tooth part 121 is uniformly arranged along the circumference of the second connecting end head 12, so that the second connecting end head 12 can uniformly transmit the rotating force from the driving device. Specifically, there is a slot 122 between two adjacent second tooth parts 121, and the driving part of the driving device extends into the slot 122 and engages with the second driving structure, so as to drive the driving coupling component to rotate by abutting against the second tooth part 121.

[0042] Referring to Figure 3 , Figure 4 and Figure 5 , in further embodiments, the slot 122 between the two adjacent second tooth parts 121 is provided as a straight slot structure, and the second tooth part 121 has a third surface 121a and a fourth surface 121b which are away from each other. The third surface 121a of each second tooth part 121 can abut against the driving part of the driving device for receiving the rotating force, and the fourth surface 121b is used to abut against the driving part on the driving device to limit the maximum position distance of the driving part in the slot 122. A lock tongue 123 with elastic deformation characteristics is further provided on the slot bottom between the third surface 121a and the fourth surface 121b in the slot 122. The lock tongue 123 is arranged in the notch 122a formed on the slot bottom. Since only the root of the lock tongue 123 is connected with the structure of the second connecting end head 12, the lock tongue 123 has elastic characteristics in the notch 122a, and a limiting protrusion 123a is arranged on the outer end of the lock tongue 123 away from the first connecting end head 11, so that the second connecting end head 12 can be fixed on the second connecting end head 12 by the lock tongue 123 when it is engaged with the driving part of the driving device, so as to form a more stable engagement connection relationship between the driving coupling component and the driving device.

[0043] Referring to Figure 3As shown, in some embodiments, the body 1 is further provided with a transition region 13 between the first connecting end 11 and the second connecting end 12, the transition region 13 is in a tapered structure gradually reduced from the second end to the first end of the body 1, and the size of the first connecting end 11 is smaller than the size of the second connecting end 12. Thus, the driving coupling component proposed in the present application can not only stabilize the transmission, but also adapt the first driving structure and the second driving structure to be shaped on the corresponding first connecting end 11 or second connecting end 12 according to their sizes, and the transition region 13 can give way to the structures of other components during the transmission of the body 1, so as to avoid the influence of other components on the working state or rotation performance of the driving coupling component.

[0044] The embodiments of the present application are described in detail above, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described above by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless specifically stated and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0048] Finally, it should be noted that the above description is only for the preferred embodiments of the present application, and those of ordinary skill in the art can make various similar modifications under the inspiration of the present application without departing from the purpose and scope of the present application. Such modifications are also within the protection scope of the present application.

[0049] The above is only some embodiments of the present application. Those of ordinary skill in the art can make several modifications and improvements without departing from the creative concept of the present application, and these are all within the protection scope of the present application.

Claims

1. A drive coupling member characterized by, Comprising: a body (1) for connecting with a target device (2); a first driving structure provided on the body (1) for engaging with a target driving structure (21) on the target device (2) to enable the body (1) to rotate synchronously with the target device (2); the first driving structure comprising: a first meshing part (111) having a first surface (111a) for abutting against the target driving structure (21) to transmit a rotating force through the first surface (111a); wherein the first meshing part (111) is provided with a limiting structure (112) for abutting against the target driving structure (21), the limiting structure (112) forming a second surface (111b) on a side of the first meshing part (111) away from the first surface (111a), the second surface (111b) being capable of forming a second spacing distance (L2) with the target driving structure (21), the second spacing distance (L2) being set to be equal to or less than 0.5 mm.

2. The driving coupling component according to claim 1, wherein the second surface (111b) is provided as a straight surface structure extending axially along the body (1) to form the second spacing distance (L2) with the target driving structure (21).

3. The drive coupling member of claim 1, wherein, the second surface (111b) comprises: a first region (111c) capable of forming the second spacing distance (L2) with the target driving structure (21) for abutting against the target driving structure (21); a second region (111d) capable of forming a third spacing distance (L3) with the target driving structure (21), the third spacing distance (L3) being greater than the second spacing distance (L2).

4. The driving coupling component according to claim 1, wherein the limiting structure (112) is integrally formed with the first meshing part (111).

5. The drive coupling member of claim 1, wherein, Further comprising: a first connecting end (11) provided on a first end of the body (1), the first connecting end (11) being formed with the first driving structure, and each of the first meshing parts (111) being arranged circumferentially along the first connecting end (11).

6. The drive coupling member of claim 5, wherein, Further comprising: a second connecting end (12) provided on a second end of the body (1) away from the first end for connecting with a driving device; a second driving structure formed on the second connecting end (12) to enable the body (1) to receive a rotating driving force of the driving device through the second driving structure.

7. The drive coupling member of claim 6, wherein, the second driving structure comprising: a second meshing part (121) arranged circumferentially along the second connecting end (12) and forming a slot (122) between adjacent second meshing parts (121) to enable the second driving structure to engage with the driving device.

8. The driving coupling component according to claim 7, wherein The insertion slot (122) is arranged as a straight slot structure extending axially along the second connecting end (12), and the second toothed part (121) has a third surface (121a) and a fourth surface (121b) facing away from each other, the third surface (121a) being used for abutting on the driving device to enable the body (1) to receive a rotary driving force from the driving device, and the fourth surface (121b) being used for abutting against to limit the maximum displacement distance of the driving device in the insertion slot (122).

9. The drive coupling part according to claim 1, characterized in that The body (1) is provided with a transition area (13) between the first connecting end (11) and the second connecting end (12), the transition area (13) being arranged as a taper structure gradually reducing from the second end to the first end of the body (1).

10. An image forming apparatus characterized by comprising: A driving device connected with the drive coupling part according to any one of the preceding claims 1-9.

Images