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 comprises a body and a driven rod that reciprocates axially relative to the body; a transverse partition wall is arranged in the body, one side of the transverse partition wall is a receiving cavity, and the other side is provided with a pair of elastic claws, the pair of elastic claws extend axially from the transverse partition wall in a cantilever shape, and the radial maximum dimension is smaller than the diameter of the receiving cavity; the driven rod has an axial limit head that cooperates with the pair of elastic claws. 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 where the transfer roller is located. 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 on the technical solution disclosed in US2008 / 0152388A1, a Chinese invention patent application with publication number CN103376696A discloses an invention entitled a torque transmission device and a process cartridge for a laser printer. The driving head disclosed therein comprises a body and a driven rod, the driven rod comprises a guide column and an input head located on one side of the length direction of the guide column, the body is provided with an accommodating cavity, the guide column is located in the accommodating cavity and can reciprocate along the axial direction of the body.

[0005] The driving head provided by CN103376696A is provided with an input arm on its body, and the driven rod and the body maintain a matching relationship that can reciprocate mutually in the axial direction or longitudinal direction of the body, and the limiting mechanism limits the moving area of ​​the driven rod in the axial direction of the body, and at the same time, the component end cover of the limiting mechanism limits the position of the output arm in the accommodating cavity so that the driven rod as a whole is also fixed on the body. In this structural mode, the input arm on the body receives the rotational driving force transmitted by the output arm on the driven rod, so that the body rotates, and then drives other working parts into a rotating working state. At the same time, the limiting mechanism limits the moving area of ​​the driven rod in the axial direction of the body, and limits the component guide column of the driven rod in the accommodating cavity inside the body, avoiding the risk of the driven rod falling off from the body, thereby ensuring that the entire torque receiving assembly has good reliability and stability when transmitting the rotational driving force. The photosensitive drum and processing box using the torque receiving assembly inherit the above-mentioned characteristics of the torque receiving assembly, and have the advantages of stable machine drop during installation, reliable performance when transmitting rotational force, and stable operation.

[0006] However, the drive head of CN103376696A is composed of four parts, namely a main body, a force-bearing rod, a spring and a pressure cover, which are assembled together. The structure is relatively complex and the assembly is also relatively troublesome. Further structural simplification design is required, especially for some drive heads with smaller main body diameters. The pressure cover and the main body are positioned by snap-fitting arranged in the circumferential direction. After the pressure cover is assembled, the out-of-roundness of the main body is often increased, resulting in imaging quality problems. Therefore, it is even more necessary to improve the design. Summary of the invention

[0007] The main purpose of the present invention is to provide a driving head with a simple structure and convenient assembly;

[0008] Another object of the present invention is to provide a photosensitive drum constructed by the above-mentioned drive head;

[0009] Still another object of the present invention is to provide a processing box constructed by the above-mentioned photosensitive drum.

[0010] In order 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; a transverse partition wall is arranged in the main body, one side of the transverse partition wall is a receiving cavity, and the other side is provided with a pair of elastic claws, the pair of elastic claws extend axially from the transverse partition wall in a cantilever shape, and the radial maximum dimension is smaller than the diameter of the receiving cavity; the driven rod has an axial limit head that cooperates with the pair of elastic claws.

[0011] It can be seen from the above scheme that compared with the prior art, the present invention omits the pressure cover and eliminates the radial force of the pressure cover on the buckle of the main body, thereby not affecting the out-of-roundness of the main body, and improves the structure of the main body and the driven rod, making the assembly of the drive head relatively simple, convenient and quick.

[0012] A further solution is that, viewed from a section through the axis of the body, the partition wall is a straight wall, a folded wall or a curved wall perpendicular to the axis. Such a design minimizes the effect of the elastic claw on the out-of-roundness of the body when it is subjected to force.

[0013] Another further solution is that an annular wall surrounding the pair of elastic claws is extended axially from the transverse partition wall, and the diameter of the annular wall is smaller than the diameter of the accommodating cavity. For the present invention with a smaller diameter of the drive head, the diameter of the elastic claws is even smaller, and the provision of the annular wall can increase the strength of the elastic claws, effectively preventing damage to the elastic claws during assembly and malfunction of the elastic claws during driving operation, while further reducing the influence of the relative movement of the internal parts of the drive head on the non-roundness of the body.

[0014] A further solution is that the body further includes a conduit portion, the conduit portion and the pair of elastic claws are co-centrally connected and extend axially from the transverse partition wall toward one side of the accommodating cavity, and the driven rod has a first sliding section that is clearance-matched with the conduit portion. This solution makes the axial movement of the driven rod relative to the body more stable.

[0015] A further solution is that a circular sliding hole is formed between the claw tips of the pair of elastic claws; and the driven rod has a second sliding section that is gap-matched with the sliding hole.

[0016] A further solution is to provide a first alignment mark on the visible surface of the peripheral wall surrounding the accommodating cavity; a second alignment mark is provided on the visible surface of the driven rod; the first alignment mark and the second alignment mark are used to determine the relative rotation angle between the two during the assembly process of the driven rod to the main body.

[0017] To achieve the above-mentioned other object, the photosensitive drum provided by the present invention includes a drum cylinder, and the driving head of any of the above-mentioned schemes is installed at one end of the drum cylinder.

[0018] To achieve the above-mentioned further object, the processing box provided by the present invention comprises a box body, and the photosensitive drum of the above-mentioned solution is installed on the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a front view of the body in the drive head embodiment;

[0020] Figure 2 yes Figure 1 Right view of;

[0021] Figure 3 yes Figure 1 Left view of

[0022] Figure 4 yes Figure 3 A-A section view;

[0023] Figure 5 yes Figure 3 B-B section view;

[0024] Figure 6 yes Figure 1 A stereogram from the first person’s perspective;

[0025] Figure 7 yes Figure 1 A stereogram from a second perspective;

[0026] Figure 8 is a cross-sectional view of another embodiment of the body;

[0027] Fig. 9 is a front view of a driven rod in an embodiment of a drive head;

[0028] Fig.10 yes Fig. 9 Right view of;

[0029] Fig.11 yes Fig. 9 Left view of

[0030] Fig.12 yes Fig. 9 A stereogram from the first person’s perspective;

[0031] Fig.13 yes Fig. 9 A stereogram from a second perspective;

[0032] Fig.14 is a structural diagram of an embodiment of a drive head;

[0033] Fig.15 yes Fig.14 C-C section view of

[0034] Fig.16 yes Fig.14 The structural breakdown diagram of

[0035] Fig.17 is a schematic structural diagram of an embodiment of a photosensitive drum;

[0036] Fig.18 It is a schematic structural diagram of a process box embodiment.

[0037] The present invention is further described below in conjunction with various embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] Drive head embodiment

[0041] The driving head according to the present invention is composed of three parts: a body, a driven rod and a spring. The body structure is as follows: Figures 1 to 7 .

[0042] See also Figure 1 The main body 1 is roughly cylindrical in shape and is provided with wheel-shaped teeth 18 for transmitting torque to other rotating parts, and a pair of elastic claws 13 extend from the left side.

[0043] See also Figure 2 A receiving cavity 12 is provided at one end of the body 1. The receiving cavity 12 is roughly cylindrical. A small groove 151 serving as a first alignment mark is provided on the end surface of a peripheral wall 15 surrounding the receiving cavity 12. A pair of convex strips 19 serving as force arms are also radially symmetrically provided on the inner side of the peripheral wall 15. The conduit portion 16 is also a spring seat, which is provided with a fixing groove 161 for circumferentially positioning the end of the spring.

[0044] See also Figure 3 A circular sliding hole 17 is formed between the claw tips of the pair of elastic claws 13 , and the annular wall 14 is arranged around the pair of elastic claws 13 .

[0045] See also Figure 4 A transverse partition wall 11 is provided in the body 1. In this example, the transverse partition wall 11 is Figure 4 From a middle perspective, it is a folded wall composed of two straight walls perpendicular to the axis of the body 1 and a wall parallel to the axis and connecting the two straight walls. From a spatial perspective, the transverse partition wall 11 is composed of two annular walls with a larger and smaller diameter and a cylindrical wall.

[0046] The right side of the transverse partition wall 11 is the accommodating chamber 12, and the left side is provided with a pair of elastic claws 13. The elastic claws 13 extend from the transverse partition wall 11 to the left along the axial direction of the body 1, forming a cantilever structure based on the transverse partition wall 11. The outer contour line of the maximum cross section of the pair of elastic claws 13 is a circle, and its diameter is smaller than the diameter of the accommodating chamber 12. An annular wall 14 surrounding the pair of elastic claws 13 also extends axially from the transverse partition wall 11, and the diameter of the annular wall 14 is also smaller than the diameter of the accommodating chamber 12. A small groove 151 is provided on the end surface of the peripheral wall 15 as a first alignment mark, and the small groove 151 will be explained when explaining the assembly process of the drive head. The body 1 also has a conduit portion 16, which is arranged co-centering with the pair of elastic claws 16 and extends rightward from the transverse partition wall 11, that is, extends axially toward one side of the accommodating chamber 12.

[0047] See also Figure 5 Combined with Figure 4 The cross section of the elastic claw 13 is an arc, which can improve the bending strength of the elastic claw, and the sliding hole 17 is arranged at the claw tip.

[0048] See also Figure 6 and Figure 7 The two figures reflect the structures of the main body 1 at both ends of the axial direction from different angles, which can more clearly illustrate the structural features represented by each number and the positional relationship between them.

[0049] Driven rod

[0050] The structure of the driven rod is shown in Figures 9 to 13 .

[0051] See also Fig. 9 The driven rod 2 has an axial stopper 21 that matches with a pair of elastic claws 13, and to the right are the second sliding section 22 that matches with the sliding hole 17, and the first sliding section 23 that matches with the guide tube 16. To the right is the reinforcing cylinder 24, on the outer wall of which are symmetrically provided with a pair of power bars 25 for transmitting torque, a sliding disk 26 that matches with the accommodating cavity, and a pair of input teeth 27. Among them, a small groove 28 is provided on the circumference of the sliding disk 26 as a second alignment mark.

[0052] See also Fig.10 The function of a pair of input teeth 27 is the same as that of the prior art, which is to receive the torque transmitted from the printer power head.

[0053] See also Fig.11 A spring seat 29 is also provided co-center-line on the inner side of the reinforcing tube 24, and a fixing groove 291 is provided on the spring seat 29 for circumferentially positioning the fixed end of the spring.

[0054] See also Fig.12 and Fig.13The two figures reflect the structures of the driven rod 2 at both ends of the axial direction from different angles, which can more clearly illustrate the structural features represented by each number and the positional relationship between them.

[0055] Drive head

[0056] See also Fig.14 The driving head 100 is assembled by a body 1, a driven rod 2 and a spring. The assembled sliding disk 26 is located in the accommodating cavity 12 and is clearance-matched with the inner wall of the peripheral wall 15.

[0057] See also Fig.15 As in the prior art, the spring 3 is placed in the accommodating cavity 12. The spring 3 is both a compression spring and a torsion spring. Both ends of the spring 3 form a straight rod hook bent toward the center of the spring circle. In the axial direction, one end 32 is sleeved on the spring seat 29, and its straight rod hook is inserted into the fixing groove 291. The other end 31 is sleeved on the conduit portion 16 as the spring seat, and its straight rod hook is inserted into the fixing groove 161. When the driven rod 2 moves to the right relative to the body 1 in the axial direction, the end surface of the reinforcing tube 24 is pressed against the transverse partition wall 11. When the driven rod 2 moves to the left relative to the body 1 under the action of the compression and restoring force of the spring 3, the limit is that the limit head 21 is pressed against the claw tip of the elastic claw 13. Fig.15 status.

[0058] Drive head assembly

[0059] See also Fig.16 In this example, during assembly, first, one end 31 of the spring 3 is installed into the accommodating cavity 12 of the body 1, and the end is sleeved on the conduit portion 16 in the form of a straight rod hook inserted into the fixing groove 161, and then one end of the limit head 21 of the driven rod 2 is inserted into the one end 32 of the spring 3, so that the end is sleeved on the fixing seat 291 in the form of a straight rod hook inserted into the fixing groove 291, and the pressure of the driven rod 2 moving toward the body 1 is applied in the axial direction. At this time, the angle between the small groove 28 and the connecting line of the small groove 151 and the center line is about 120 degrees to 160 degrees. Fig.14 In the state shown, before the power bar 25 passes over the convex bar 19 in the axial direction, the driven rod 2 is rotated around the axis relative to the main body 1 until the small groove 28 is aligned with the small groove 151 in the circumferential direction, and the compression restoring force and torsional restoring force of the spring 3 are preset, and then the axial push is applied to force the limit head 21 to be pushed open in the radial direction and pass through a pair of elastic claws 13. After the limit head 21 passes through, the assembly of the drive head 100 is completed.

[0060] Photosensitive drum embodiment

[0061] See also Fig.17 Since the present invention is mainly an improvement on the drive head 100 , the photosensitive drum according to the present invention is provided with the drive head 100 installed at one end of the drum 200 .

[0062] Processing box embodiment

[0063] See also Fig.18 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.

[0064] Other Implementations

[0065] Only other embodiments of the drive head 100 are described below.

[0066] See also Figure 8 Since the present invention is a structural improvement for a body 1 with a relatively small diameter, a transverse partition 11 and a pair of elastic claws 13 are mainly provided in the body 1. The transverse partition 11 can also be designed as Figure 8 The straight wall form shown has the advantage that the structure is simpler than the previous example; the transverse partition wall 11 can also be designed in the form of a curved wall, such as a quadratic curved wall, which has the advantage that the elastic claw 13 can be relatively prevented from breaking and undesired deformation.

Claims

1. A driving head, used to receive the torque of a driving rod of a laser printer, comprising a body and a driven rod that reciprocates axially relative to the body; Features: A transverse partition is provided in the body, one side of the transverse partition is a receiving cavity, and the other side is provided with a pair of elastic claws, the pair of elastic claws extend axially from the transverse partition in a cantilever shape, and the maximum radial dimension is smaller than the diameter of the receiving cavity, and a circular sliding hole is formed between the claw tips of the pair of elastic claws; The body is further provided with a conduit portion, the conduit portion and the pair of elastic claws are co-centering and extending axially from the transverse partition wall toward one side of the accommodation cavity; The driven rod comprises an axial limit head matched with the pair of elastic claws, a first sliding section matched with the conduit portion in a clearance, and a second sliding section matched with the sliding hole in a clearance.

2. The drive head according to claim 1, characterized in that: Viewed from a section passing through the axis of the body, the transverse partition wall is a straight wall, a folded wall or a curved wall perpendicular to the axis.

3. The drive head according to claim 1, characterized in that: An annular wall surrounding the pair of elastic claws is further extended axially from the transverse partition wall, and the diameter of the annular wall is smaller than the diameter of the accommodating cavity.

4. The drive head according to any one of claims 1 to 3, characterized in that: A first alignment mark is provided on a visible surface of a peripheral wall surrounding the accommodating cavity; A second alignment mark is provided on the visible surface of the driven rod; The first alignment mark and the second alignment mark are used to determine a relative rotation angle between the driven rod and the body during the assembly process of the driven rod to the body.

5. A photosensitive drum, comprising a drum, characterized in that: A drive head according to any one of claims 1 to 4 is mounted on one end of the drum.

6. A processing box, comprising a box body, characterized in that: The photosensitive drum according to claim 5 is installed on the box body.

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