Drive head, photosensitive drum and processing box

Abstract

A driving head, a photosensitive drum and a processing box, which relate to the technical field of electronic photographic imaging equipment, wherein the driving head is used to receive the torque of a driving rod of a laser printer, and comprises a body and a driven rod that reciprocates axially relative to the body; the body comprises an inner cylinder and an outer cylinder arranged coaxially, and the inner cylinder and the outer cylinder are connected radially by a connecting part; both ends of the outer cylinder are open; one end of the inner cylinder is open, and the other end is a sealed bottom plate, a limiting hole is arranged at the center of the bottom plate, and more than three through strip-shaped openings are arranged, one end of the through strip-shaped opening is connected to the limiting hole and the length direction is radially, and more than three through strip-shaped openings are evenly distributed in the circumferential direction; the driven rod has a limiting disk that matches the inner cylinder gap and an axial limiting head that matches the limiting hole. The photosensitive drum and the processing box are both equipped with the driving head of the above structure. It has the advantages of simple structure, convenient assembly and high imaging quality.

Description

Technical Field

[0001] The present invention relates to a driving head for transmitting rotational force and a photosensitive drum and a processing box using the driving head as a component thereof. Background Art

[0002] The imaging process of a laser printer with a processing box as the basic core is that the surface of the photosensitive drum is evenly charged by the charging roller. The laser scanner emits a modulated laser beam containing image information to the outer cylindrical surface of the photosensitive drum. After being irradiated by the laser beam, a static charge distribution diagram with different distributions is formed on the cylindrical surface of the photosensitive drum, that is, an electrostatic latent image corresponding to the image to be printed. After that, the developer such as toner transmitted from the developing roller is adsorbed on the surface of the photosensitive drum after the thickness is adjusted by the powder discharge knife, and the aforementioned electrostatic latent image is covered and converted into a visible image that can be observed by the naked eye. As the photosensitive drum rotates, the visible image formed by the toner on the surface of the photosensitive drum is transferred to the position of the transfer roller. The transfer voltage carried by the transfer roller transfers the visible image of toner to the surface of a recording medium such as paper. The visible image of toner on the recording medium is then heated and pressurized by a heating roller and a pressure roller, so that the toner penetrates into the fiber layer of the recording medium, and the visible image formed by the toner is permanently solidified on the recording medium. After the visible image on the photosensitive drum is transferred by the transfer roller, the residual toner attached to it is scraped off by the waste toner scraper into the waste toner collection bin, and the surface of the photosensitive drum is restored to a non-static and dust-free standby state after the static electricity is eliminated by the corresponding de-staticizing equipment. This completes a basic imaging workflow. As a result of the repeated operation of this process, the image required by the printer can be obtained.

[0003] US Patent Document US2008 / 0152388A1 discloses a process cartridge having a ball universal joint in the drive head at the end of the photosensitive drum. The ball universal joint is prone to undesirable separation, especially during transportation, which may cause the ball universal joint to lose its transmission function or become unstable.

[0004] As an improvement to the technical solution disclosed in US2008 / 0152388A1, there is a method as Fig.10 The drive head shown in the figure is composed of a main body 1, a driven rod 2, a spring 3, a pin 4, a limiter 5 and a positioning member 6 which are assembled. The structure is relatively complex and the assembly is also relatively troublesome, and further structural simplification design is required. On the other hand, after the limiter 5 is fixed in the inner cavity of the main body 1, the radial extrusion pressure between the two is too large, which will affect the out-of-roundness of the gear part on the main body 1, resulting in imaging quality problems. Therefore, it is even more necessary to improve the design. Summary of the invention

[0005] The main purpose of the present invention is to provide a driving head with a simple structure and convenient assembly;

[0006] Another object of the present invention is to provide a photosensitive drum constructed by the above-mentioned drive head;

[0007] Still another object of the present invention is to provide a processing box constructed by the above-mentioned photosensitive drum.

[0008] To achieve the above-mentioned main purpose, the driving head provided by the present invention is used to receive the torque of the laser printer driving rod, including a main body and a driven rod that moves axially back and forth relative to the main body; the main body has an inner cylinder part and an outer cylinder part that are coaxially arranged, and the inner cylinder part and the outer cylinder part are radially connected by a connecting part; both ends of the outer cylinder part are open; one end of the inner cylinder part is open, and the other end is a sealed bottom plate, a limiting hole is arranged in the center of the bottom plate, and more than three through strip openings are arranged, one end of the through strip opening is connected to the limiting hole and the length direction is along the radial direction, and the more than three through strip openings are evenly distributed in the circumferential direction; the driven rod has a limiting plate that is gap-matched with the inner cylinder part and an axial limiting head that is matched with the limiting hole.

[0009] It can be seen from the above scheme that since the main body is set in the structural form of inner and outer cylinders, that is, an inner cylinder is set in the cylinder of the prior art, the influence of other parts assembled in the inner cylinder on the out-of-roundness of the outer cylinder is relatively isolated, and the limit plate and the driven rod are set as one body to reduce the radial force on the inner cylinder, and will not affect the out-of-roundness of the outer cylinder. In addition, the cooperation between the axial limit head and the limit hole eliminates the positioning parts in the prior art, which reduces the parts of the drive head and improves the assembly efficiency. More than three through strip openings can make the diameter of the limit hole expand when subjected to axial force, which is convenient for axial extrusion through the limit head during assembly.

[0010] A further solution is that the connecting part is a torus, and the torus is located approximately in the middle of the outer cylinder in the axial direction. This solution can minimize the influence of the inner cylinder axis on the outer cylinder when the inner cylinder axis changes its angle.

[0011] Another further solution is that a plurality of axially arranged reinforcing ribs are further provided between the outer cylinder and the inner cylinder, the reinforcing ribs extend from the connecting portion toward the bottom plate, and the plurality of reinforcing ribs are evenly distributed in the circumferential direction; more than three through strip-shaped openings extend radially to the peripheral wall of the inner cylinder and extend axially on the peripheral wall. The advantage of this solution is that it can strengthen the support of the inner cylinder.

[0012] A further solution is that the distance between the reinforcing rib and the adjacent end of the through strip opening in the axial direction is greater than or equal to zero. This solution can strengthen the support for the inner cylinder while making the elasticity of the limiting hole meet the design requirements within an optional range.

[0013] A further solution is that a mark is provided on the visible surface of the open end of the inner tube or the same direction end of the outer tube, and the mark is used as a reference for the pre-set torque of the spring when the driven rod is assembled to the body. The advantage of this solution is that it is easy to produce and assemble the drive head.

[0014] A further solution is that the mark is a pair of symmetrically arranged protrusions or depressions. The advantage of this solution is that the mark is eye-catching and not easy to disappear.

[0015] To achieve another object of the present invention, one end of the photosensitive drum provided by the present invention is equipped with the driving head described in any of the above solutions.

[0016] To achieve another object of the present invention, the processing box provided by the present invention includes a box body, and the photosensitive drum described in the above scheme is installed on the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural exploded view of an embodiment of a drive head of the present invention;

[0018] Figure 2 is a perspective view of an embodiment of a drive head of the present invention;

[0019] Figure 3 is a cross-sectional view of an embodiment of a drive head of the present invention;

[0020] Figure 4 It is the main view of this body;

[0021] Figure 5 yes Figure 4 A top view of

[0022] Figure 6 yes Figure 4 Bottom view of

[0023] Figure 7 It is a stereogram of the main body;

[0024] Figure 8 is a perspective view of an embodiment of a photosensitive drum of the present invention;

[0025] Fig. 9 is a perspective view of an embodiment of a process cartridge of the present invention;

[0026] Fig.10 It is a structural exploded view of the existing drive head.

[0027] The present invention is further described below in conjunction with various embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0028] The accompanying drawings of the embodiments are only schematic diagrams of the structural principles, and the same reference numerals in the drawings represent the same structures. If there are slight differences, they will be specially explained in words.

[0029] In addition, only the structure of the present invention that is different from the prior art is introduced in detail below, and for the working principle of the drive head itself and other structures related to the present invention, and the structure of the photosensitive drum and the processing box, those skilled in the art can refer to the prior art of the present invention, patent documents CN103376696A, CN104155864A and other disclosures to understand and implement them.

[0030] Drive head embodiment

[0031] See also Figure 1 and Figure 2 The drive head according to the present invention is used to mesh with the laser printer drive rod, receive and transmit torque, and is assembled from three parts: a body 1, a driven rod 2 and a spring 3. The spring 3 is installed in the body 1 in a compressed and twisted manner. The main body of the spring 3 is sleeved on the rod body of the driven rod 2. The spring 3 is a compression spring and a torsion spring. The body 1 has an outer cylinder 11 and an inner cylinder 12 and a connecting portion 13 arranged therebetween. The outer cylinder 11 and the inner cylinder 12 are arranged coaxially. Figure 3 It can be seen that the connecting part 13 of this example is a torus. From the radial direction, the outer circle of the torus is connected to the outer cylinder, and the inner circle is connected to the inner cylinder. Two depressions 124 are symmetrically arranged on the open end surface of the inner cylinder 12 as marks, and a pair of force-bearing parts 125 are symmetrically arranged on the inner wall. One end of the spring 3 is a hook 32 with a plane in the circumferential surface, and the other end is a hook 31 with a plane in the radial surface. The upper end of the driven rod 2 is a pair of meshing teeth 25 that mesh with the driving rod, and from top to bottom are the limit plate 21 that is clearance-matched with the inner cylinder 12, a pair of symmetrically arranged force transmission parts 24, the rod body 23 and the axial limit head 22. The spring 3 is sleeved outside the rod body 23, and the hook 32 is sleeved on one of the force transmission parts 24.

[0032] See also Figure 3 The outer cylinder 11 is open at both ends, the outer periphery of the upper end is the gear part, and the lower end is used to insert the drum of the photosensitive drum and be fixed to the end of the drum, while the inner cylinder 12 is only connected by the connecting part 13, and the connecting part 13 is roughly located in the middle of the outer cylinder 11 in the axial direction, that is, far away from the two ends. The inner cylinder 12 will not directly affect the out-of-roundness of the outer cylinder 11 due to the change of out-of-roundness or axis tilt during the assembly or operation of the driven rod 2. The upper end of the inner cylinder 12 is open, and the lower part is a sealed bottom plate 121. The center of the bottom plate 121 is provided with a limit hole. The bottom plate 121 is symmetrically provided with a pair of spring seats 126 on one side of the inner cylinder 12. The hook 31 at the other end of the spring 3 is hooked on the spring seat 126 in the form of generating a torsional restoring force. The diameter of the axial limit head 22 is slightly larger than the diameter of the limit hole in the natural state. In this way, the spring 3 is also squeezed and arranged in the cavity of the inner cylinder 12. Figure 3In the state shown, when one end of the meshing tooth 25 is subjected to an axial external force from the laser printer driving rod to overcome the axial restoring force of the spring 3, the driven rod 2 will move downward in a straight line along the axis relative to the body 1. After the external force disappears, under the action of the axial restoring force of the spring 3, the driven rod will move upward until the axial limit head 22 is blocked by the limit hole.

[0033] See also Figure 4 and Figure 5 , Figure 4 is the main view of the body 1, Figure 5 It is a top view of the body 1. The aforementioned force-bearing part 125 is arranged on the inner wall of the inner cylinder 12. The force-bearing part 125 cooperates with the force-transmitting part 24 to transmit torque inside the driving head. On the other hand, when the driven rod 2 moves downward, it also cooperates with the limiting plate 21 to limit the downward movement of the driven rod 2. A limiting hole 122 is arranged at the center of the bottom plate 121, and four through strip openings 123 are arranged. One end of each through strip opening 123 is connected to the limiting hole 122, and its length direction is along the radial direction. From the circumferential direction, the four through strip openings 123 are evenly distributed, forming a cross opening with the limiting hole 122 as the center on the bottom plate 121. As mentioned above, a pair of spring seats 126 are also arranged on the inner side of the bottom plate 121.

[0034] See also Figure 6 , Figure 6 It is a bottom view of the main body 1 , and eight reinforcing ribs 111 evenly distributed in the circumferential direction are arranged between the outer cylinder portion 11 and the inner cylinder portion 12 .

[0035] Replay Figure 3 The reinforcing ribs 111 are arranged axially and extend from the connecting portion 13 to the bottom plate 121. In this example, the through strip openings 123 extend radially to the peripheral wall of the inner cylinder portion 12 and extend axially on the peripheral wall. Figure 3 In this example, the axial distance between the adjacent ends of the downwardly extending reinforcing rib 111 and the upwardly extending through strip opening 123 is 1 mm. The axial extension distance between the two and the size of the distance can be determined based on factors such as the hardness, elasticity and structural dimensions of the main body material, so as to meet the expansion requirements required for the assembly of the limiting hole 122, the limiting function during operation and the strength requirements of the inner cylinder.

[0036] See also Figure 7 , Figure 7 It is a three-dimensional diagram viewed from the open end of the inner cylinder portion 12 , which more clearly expresses the positional relationship among the bottom plate 121 , the limiting hole 122 , the through strip opening 123 , the spring seat 126 and the force-bearing portion 125 .

[0037] Drive head assembly

[0038] See also Figure 1In this example, during assembly, the spring 3 is firstly put on the rod body 23 and the hook 32 at one end is hooked on a force transmission part 24, and then the hook 31 at the other end of the spring 3 is hooked on the spring seat 126, and when the limit plate 21 is located at the upper end of the force receiving part 125, the driven rod 2 is rotated counterclockwise relative to the body 1 to Figure 2 When the position shown is reached, that is, the line connecting a pair of meshing teeth 25 coincides with the line connecting a pair of recesses 124, the driven rod 2 is pressed axially downward, so that the axial limit head 22 presses the limit hole 122. Due to the existence of the through strip-shaped opening 123, the diameter of the limit hole 122 expands. After the axial limit head 22 passes through the limit hole 122, the limit hole 122 rebounds to the diameter in the natural state, forming a clearance fit with the rod body 23, thereby completing the assembly of the entire drive head.

[0039] Other embodiments of the drive head

[0040] Other embodiments according to the present invention may have the following forms. The connecting portion 13 may also be an intermittent annular body, and in the case where the material strength is sufficient, it may even be designed as a spoke-shaped connecting portion. The through-strip openings 123 should be set to a minimum of three. When the elasticity of the material selected to manufacture the main body 1 is too small, the number of strips should be increased accordingly to facilitate assembly; of course, if the elasticity of the material is relatively large, the length of the through-strip openings 123 may be limited to the bottom plate 121, and it does not even need to reach the boundary of the bottom plate 121. Obviously, the depression 124 used as a mark may also be a protrusion, and may also be set on the visible surface of the outer cylinder 11 at the same end. The above-mentioned variations can also achieve the corresponding purposes of the present invention.

[0041] Photosensitive drum embodiment

[0042] See also Figure 8 Since the present invention is mainly an improvement on the drive head 100 , the photosensitive drum according to the present invention is a photosensitive drum having the drive head 100 in the above-mentioned various embodiments installed at one end of the drum 200 .

[0043] Processing box embodiment

[0044] See also Fig. 9 Also, since the present invention is mainly an improvement on the drive head 100, the processing box according to the present invention is a photosensitive drum with the above-mentioned drive head 100 rotatably installed between the two end walls of the box body 300.

Claims

1. A driving head, used to receive the torque of the driving rod of the laser printer, comprising a body and a driven rod that reciprocates axially relative to the body; Features: The body comprises an inner cylinder portion and an outer cylinder portion arranged coaxially, wherein the inner cylinder portion and the outer cylinder portion are connected in radial direction via a connecting portion; The outer tube portion has open ends at both ends; The inner cylinder is open at one end and is a sealed bottom plate at the other end. A limiting hole is provided at the center of the bottom plate, and more than three through strip openings are provided. One end of the through strip opening is connected to the limiting hole and the length direction is radial. The more than three through strip openings are evenly distributed in the circumferential direction. The driven rod has a limit plate that is clearance-matched with the inner cylinder and an axial limit head that is blocking-matched with the limit hole. The diameter of the axial limit head is slightly larger than the diameter of the limit hole in a natural state. The diameter of the limit hole expands when subjected to axial force, which facilitates axial extrusion of the axial limit head during assembly. After the axial limit head passes through the limit hole, the limit hole rebounds to the diameter in the natural state, forming a clearance fit with the rod body of the driven rod.

2. The drive head according to claim 1, characterized in that: The connecting portion is a circular ring, and the circular ring is approximately located in the middle of the outer cylinder in the axial direction.

3. The drive head according to claim 1, characterized in that: A plurality of axially arranged reinforcing ribs are also provided between the outer cylinder portion and the inner cylinder portion, the reinforcing ribs extending from the connecting portion toward the bottom plate, and the plurality of reinforcing ribs are evenly distributed in the circumferential direction; The three or more through-strip openings extend radially to the peripheral wall of the inner cylinder portion and extend axially on the peripheral wall.

4. The drive head according to claim 3, characterized in that: The axial distance between the reinforcing rib and the adjacent ends of the through strip opening is greater than or equal to zero.

5. The drive head according to any one of claims 1 to 4, characterized in that: A mark is provided on the visible surface of the open end of the inner cylinder or the same-direction end of the outer cylinder, and the mark is used as a reference for the pre-set torque of the spring when the driven rod is assembled to the body.

6. The drive head according to claim 5, characterized in that: The mark is a pair of symmetrically arranged protrusions or depressions.

7. A photosensitive drum, comprising a drum, characterized in that: A drive head according to any one of claims 1 to 6 is mounted on one end of the drum.

8. A processing box, comprising a box body, characterized in that: The photosensitive drum according to claim 7 is installed on the box body.

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