CN106896686A - A power transmission device, a photosensitive element and a process cartridge - Google Patents

Abstract

The invention relates to a power transmission device, and a photosensitive element and a processing box with the power transmission device, wherein the power transmission device comprises a flange with a rotation axis L1, a flange bracket, a power receiving part and a power transmission part which are installed in the flange, and a movable part, the flange bracket is used for supporting the flange, the power transmission part is installed in the power receiving part, the power receiving part passes through the movable part, the movable part is installed between the flange and the flange bracket, when the power transmission device is combined with or separated from a power output device, the acting force of a cover door of a printer is not needed, and therefore, the photosensitive element or the processing box with the power transmission device can be effectively ensured to be widely used.

Description

A power transmission device, a photosensitive element and a process cartridge

technical field

The invention relates to the field of electrophotographic imaging, in particular to a power transmission device, a photosensitive element and a process box with the power transmission device.

Background technique

A printer is a type of electrophotographic imaging device, and a process cartridge detachably installed in the printer is a consumable therein. The process cartridge works by receiving driving force from the printer. In order to obtain the driving force required for the process cartridge to work, Generally, a power output device is arranged in the printer, and a power transmission device is arranged in the process box. After the process box is loaded into the printer, the power transmission device is combined with the power output device to receive and transmit driving force; When it is disassembled, the power transmission device is disengaged from the power output device.

Fig. 1 is a schematic view of the overall structure of a conventional process box, and Fig. 2 is a schematic view of the structure of a power transmission device in a conventional process box.

As shown in Figures 1 and 2, the process cartridge C includes a process cartridge housing 1 and a photosensitive element 11 rotatably installed in the process cartridge housing, and the process cartridge C is installed in the printer along the Y direction in the figure, defining the Y The direction is the horizontal direction, and the X direction perpendicular to the Y direction is the vertical direction. In order to receive the driving force from the printer, a power receiving port 12 is installed at a longitudinal end of the photosensitive element 11. When the process cartridge is loaded into the printer, the power receiving port 12 stretches out and combines with the power output device in the printer, and receives the driving force ; When the process box needs to be disassembled from the printer, the power receiving port 12 is retracted, and at this time, the power receiving port 12 is disengaged from the power output device in the printer.

In order to realize the above-mentioned extension and retraction process of the power receiving port 12, a control device for controlling the expansion and contraction of the power receiving port 12 is also provided in the process box C. The control device includes a spring 18 and a pressing rod 13, and the pressing rod 13 is connected to The power receiving port 12 is connected, and one end of the spring 18 is connected with the other end of the pressing rod 13, and the other end of the spring is connected with the process cartridge housing 1; the end connected with the power receiving port on the described pressing rod 13 is provided with a push-out surface 13a, the indentation surface 13b, and the inclined surface 13c between the push-out surface and the indentation surface. When the pressing rod 13 is not subjected to external force, the indentation surface 13b is in contact with the power socket 12, and the power socket 12 is retracted at this moment. state; as shown in Figure 2, when the pressing rod 13 is subjected to the external force F, the pressing rod 13 moves toward the Y direction, the power receiving port 12 contacts the inclined surface 13c, and is applied to the power receiving port 12 along the X direction through the inclined surface 13c The active force pushes the power receiving port 12 to move along the X direction to protrude, and finally reaches the pushing surface 13a. At this time, the power receiving port 12 is supported by the pushing surface 13a. At the same time, in order to stabilize the movement track of the pressing rod 13 , a guiding groove 19 is provided on the process cartridge housing 1 , and the pressing rod 13 is installed in the guiding groove 19 .

However, after the process cartridge C is loaded into the printer, the end of the pressing rod 13 connected to the spring 18 is a free end suspended outside, and the external force F comes from the printer door, that is to say, the power receiving port 12 Extending out requires the help of the printer door. It must be ensured that the printer door is closed along the Y direction and can touch the pressing rod 13, and the printer door can continuously apply force to the pressing rod 13. When the printer door is loose, Even if the printer door can touch the pressing rod 13, it cannot provide continuous active force to the pressing rod 13, and the stretching of the power receiving port 12 will not be realized; when the closing direction of the printer door is perpendicular to the X direction and the Y direction During the -Z direction, the printer cover door will not be able to touch the pressing rod 13, therefore, the power receiving port 12 will not stretch out, and the scope of application of the process box provided with the power receiving port 12, pressing rod 13 and spring 18 is limited. Extremely restrictive.

Contents of the invention

The present invention provides a power transmission device which is mounted on one longitudinal end of a photosensitive element which is rotatably mounted in a process cartridge, and does not require the use of a printer cover when the process cartridge is loaded into the printer. The door, the power transmission device can realize the combination with the power output device in the printer and receive the driving force.

The present invention also provides a power transmission device, which is installed on one longitudinal end of the process box. Combined with the power take-off device in and receives the driving force.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

A power transmission device, comprising a flange with a rotation axis L1, a flange bracket, a power receiving part installed in the flange, a power transmission part and a movable part, the flange bracket is used to support the flange, and the power The transmission part is installed in the power receiving part, and the power receiving part passes through the movable part, and the movable part is installed between the flange and the flange bracket.

The movable part includes a movable plate, a second through hole arranged on the movable plate, and an elastic element connected with the movable plate, the power receiving element passes through the second through hole, and the elastic element abuts against the movable plate. between the plate and the flange bracket or between the movable plate and the flange.

The power receiving member has a rotation axis L2, includes an intermediate rod, and first and second end portions respectively located at two ends of the intermediate rod along the rotation axis L2.

The intermediate rod is a cylinder, and a long hole extending along the rotation axis L2 is opened in the radial direction of the cylinder.

The second end portion includes an extension extending from the middle rod to a direction away from the middle rod along the rotation axis L2 and a freely rolling ball mounted on the extension.

The extension part is a cone, wherein the bottom of the cone is connected to the middle rod, and the ball is mounted on the top of the cone.

The flange includes a flange opening, a flange cavity, a limiting rib protruding radially inward from the inner wall of the flange cavity, and a plurality of ribs protruding radially inward from the inner wall of the flange cavity and extending along the rotation axis L1. a power receiving portion, a bottom wall opposite to the flange opening along the rotation axis L1, a tapered portion extending from the bottom wall to the flange opening along the rotation axis L1, and a receiving portion at the top end of the tapered portion, the The receiving part is used to accommodate the sphere.

The present invention also provides a photosensitive element, which includes a photosensitive cylinder and the above-mentioned power transmission device, and the power transmission device is installed at the end of the photosensitive cylinder.

The present invention also provides a process cartridge including the photosensitive member as described above, the photosensitive member being rotatably mounted in the process cartridge.

When the power transmission device of the present invention, or the photosensitive element adopting the power transmission device of the present invention, or the process cartridge with the power transmission device of the present invention is combined with and disengaged from the power output device provided in the printer, it will not It is necessary to rely on the force of the printer door, even if the printer door is loose or the closing direction of the printer door is in the -Z direction perpendicular to the X direction and the Y direction, it will not affect the combination of the power transmission device and the power output device. detachment, thereby effectively ensuring that the photosensitive element or the process box installed with the power transmission device can be widely used.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a conventional process cartridge.

Fig. 2 is a schematic structural view of a power transmission device in a conventional process cartridge.

Fig. 3 is an overall configuration diagram of a power transmission device according to the present invention.

Fig. 4 is an exploded schematic view of the power transmission device involved in the present invention.

Fig. 5 is a schematic structural view of the power receiving part in the power transmission device of the present invention.

Fig. 6 is a schematic structural view of the flange in the power transmission device of the present invention.

Fig. 7 is a sectional view of section A-A in Fig. 3 .

Fig. 8 is a schematic diagram of the overall structure of the power output device.

Fig. 9A is a schematic diagram of the installation state of the power transmission device toward the power output device.

Fig. 9B is a sectional view of section B-B in Fig. 9A.

Fig. 10A is a schematic diagram of a state in which the power transmission device and the power output device are combined.

Fig. 10B is a sectional view of section E-E in Fig. 10A.

detailed description

Embodiments of the present invention will be described in detail below with reference to FIGS. 3-8 , 9A, 9B, 10A and 10B.

The power transmission device of the present invention is installed at one end of the photosensitive element, the photosensitive element also includes a photosensitive cylinder, the power transmission device is installed at the end of the photosensitive cylinder, and the power transmission device is used to transmit the received driving force to the photosensitive cylinder and is used to drive the rotation of the entire photosensitive element.

The present invention also relates to a process cartridge, which includes a photosensitive element rotatably installed therein. The photosensitive element receives driving force to rotate through a power transmission device, and completes an imaging process together with other components in the process cartridge.

[Structure of power transmission device]

Fig. 3 is an overall structural diagram of the power transmission device involved in the present invention; Fig. 4 is an exploded schematic view of the power transmission device involved in the present invention; Fig. 5 is a schematic structural view of the power receiving part in the power transmission device involved in the present invention; Fig. 6 is A schematic structural view of the flange in the power transmission device of the present invention; FIG. 7 is a cross-sectional view of the A-A section in FIG. 3 .

As shown in Figures 3 and 4, the power transmission device 20 includes a flange 21, a flange bracket 22, a power receiving part 23 and a power transmission part 27 installed in the flange, and a power transmission part installed between the flange and the flange bracket. The movable part 24, the flange bracket 22 is used to support the flange 21, the power transmission part 27 is installed in the power receiving part 23, the power receiving part 23 passes through the movable part 24, and with the movement of the movable part 24 Move and move; the power transmission device 20 has a rotation axis L1, and the power receiver 23 has a rotation axis L2. In the state shown in FIG. 3, the rotation axes L1 and L2 are coaxial, that is, they coincide. Preferably, the power transmission member 27 is a pin, and the length of the pin along the direction perpendicular to the rotation axis L2 is d5.

As shown in FIG. 4 , the flange 21 is cylindrical as a whole, and the rotation axis L1 of the power transmission device 20 is the rotation axis of the flange 21. The flange 21 includes a flange opening 211 and is adjacent to the flange opening. The rotating surface 212 of the flange bracket 22 includes a first through hole 221 and a supporting surface 222 adjacent to the first through hole; the movable part 24 includes a movable plate 240, a second through hole 241 arranged on the movable plate, and The elastic element 243 connected with the movable plate; when the power transmission device 20 is assembled, the support surface 222 is used to support the rotating surface 212, and the elastic element 243 abuts between the movable plate 240 and the flange bracket 22 or against Connected between the movable plate 240 and the flange 21 .

The movable plate 240 is preferably a cuboid block, and along the direction perpendicular to the rotation axis L2, the length of the movable plate is d4, which satisfies: d4>d5. As shown in Figure 4, the movable plate 240 also includes a first end portion 240a and a second end portion 240b located in the length direction of the movable plate, and the first end portion and the second end portion are respectively located in the longitudinal direction of the movable plate. two ends.

As shown in FIG. 5 , the power receiver 23 includes an intermediate rod 230 , and a first end portion 231 and a second end portion 232 respectively located at two ends of the intermediate rod along the rotation axis L2. The intermediate rod 230 , the first end portion 231 and the second end portion 232 are integrally formed, and at least one of the two end portions may be formed separately from the middle rod, that is, the first end portion 231 is formed separately from the middle rod 230, and the second end portion 232 is formed separately from the middle rod 230. The middle rod 230 is integrally formed; or the first end portion 231 is integrally formed with the middle rod 230, and the second end portion 232 is formed separately from the middle rod 230; or the first end portion 231 and the second end portion 232 are both separated from the middle rod 230 body formation.

The middle rod 230 is a cylinder, and a long hole 233 is opened in the radial direction of the cylinder. The long hole 233 is a through hole and extends along the rotation axis L2. The elongated hole bottom 233b of the second end portion, the power transmission member 27 passes through the elongated hole 233, and is combined with the power receiving portion 214 (as shown in FIG. 6 ) arranged in the flange 21, thereby transmitting the driving force to Flange 21.

The first end portion 231 is used to combine with the power output device in the printer and receive the driving force. As shown in FIG. The protrusions 231b protrude from the support platform 231a to the direction away from the intermediate rod 230 along the rotation axis L2. Preferably, the number of the protrusions 231b is two, and they are arranged radially opposite to each other on the support platform; of course, the implementation of the present invention In an example, the supporting platform 231a is not necessary, in this case, the protruding portion 231b directly protrudes from the middle rod 230 in a direction away from the middle rod along the rotation axis L2.

The second end portion 232 includes an extension 232a extending from the middle rod 230 to a direction away from the middle rod along the rotation axis L2 and a ball 232b mounted on the extension 232a. Preferably, the extension 232a is a cone, Wherein, the bottom of the cone is connected with the middle rod 230, the ball 232b is installed on the top of the cone, and the ball 232b can roll freely.

As shown in Figure 6, the flange 21 also includes a flange cavity 210 formed therein, a limiting rib 213 protruding radially inward from the inner wall of the flange cavity, and a limiting rib 213 radially inward from the inner wall of the flange cavity. A plurality of power receiving parts 214 protruding and extending along the rotation axis L1, a bottom wall 215 opposite to the flange opening 211 along the rotation axis L1, a tapered cone extending from the bottom wall 215 to the flange opening 211 along the rotation axis L1 part 216 and a receiving part 217 at the tip of the tapered part. Between the bottom wall 215 and the flange 21, a split structure or an integrated structure can be adopted. Similarly, a split structure or an integrated structure can also be adopted between the tapered portion 216 and the bottom wall 215. Preferably, The bottom wall 215 , the flange 21 and the tapered portion 216 are integrally formed, and the power receiving portions 214 are two radially opposite ones.

In the embodiment of the present invention, the inner diameter of the limiting rib 213 is d1, the inner diameter of the flange opening 211 is d2, and the outer diameter of the flange opening is d3, satisfying: d1<d2<d3, in order to satisfy the power transmission As for the assembly requirements of the device 20, the dimensions also satisfy: d1<d5<d2<d3, and d1<d5<d2<d4, the distance between the outer diameter d3 of the flange opening and the length d4 of the movable plate 240 The relationship is not particularly limited. Preferably, the outer diameter d3 of the flange opening and the length d4 of the movable plate 240 satisfy: d3≤d4, therefore, the relationship between the various dimensions is: d1<d5<d2< d3≤d4.

As shown in Figure 4 and Figure 7, the assembly process of the power transmission device 20 is:

a. the step of combining the middle rod 230 with the movable plate 240;

b. the step of installing the power transmission member 27;

c. the step of installing the power receiver 23;

d. the step of combining the flange 21 and the flange bracket 22;

e. The step of installing the elastic element 243 .

The step a is realized by passing the middle rod 230 of the power receiving part through the second through hole 241 on the movable plate 240; step b is by passing the power transmission part 27 through the long hole 233 on the middle rod 230; Step c is to install the intermediate rod 230 with the power transmission part 27 into the flange 21, and the power transmission part 27 is against the limit rib 213, and the movable plate 240 is located on the flange 21 at the same time; after the step d is completed, The rotating surface 212 of the flange is combined with the support surface 222 of the flange bracket; the step e is realized by installing the elastic element 243 between the movable plate 240 and the flange bracket 22, or by installing the elastic element 243 on the movable Between the plate 240 and the flange 21, in the embodiment of the present invention, preferably, the elastic element 243 is located between the movable plate 240 and the flange bracket 22, and the elastic element 243 is a spring. Of course, the elastic element 243 Elastic rubber, elastic steel sheets, etc. can also be used.

When the power transmission device 20 is in the position shown in Figure 3 and Figure 7, the power receiving part 23 is in the extended state, as shown in Figure 7, the ball 232b is located in the accommodation part 217, the power transmission part 27 is located at the bottom 233b of the long hole, elastic The element 243 is in a compressed state, and at this time, the rotation axis L2 of the power receiving member 23 is coaxial with the rotation axis L1 of the power transmission device.

In order to prevent the elastic element 243 from falling off, the power transmission device 20 also includes a positioning column 242 for positioning the elastic element 243. As shown in FIG. 4, the positioning column 242 protrudes from the side of the movable plate 240, and the elastic element 243 is installed on the positioning column 242; in order to stabilize the motion track of the power transmission member 27, the power transmission device 20 also includes a limit ring 26 with an outer diameter of d6, and the outer diameter d6 of the limit ring satisfies: d6=d2 , that is, the outer diameter of the limit ring is the same as the inner diameter of the flange opening 211, and the limit ring 26 is supported by the power receiving part 214. As shown in Figure 7, the power transmission member 27 is located between the limit ring 26 and the limit rib In the track G formed by 213; at the same time, in order to stabilize the movement track of the power receiving part 23 in the flange cavity 210, the power transmission device 20 also includes a limiter 25. In the embodiment of the present invention, the limiter 25 It is at least one pair of limit springs, and the limit springs are arranged opposite to each other along the radial direction of the flange 21. To install the limit springs, as shown in FIG. The positioning protrusion 234, preferably, the positioning protrusion 234 is a circle of ribs protruding radially outward from the middle rod 230, as shown in Figure 7, one end of the limit spring 25 is sleeved on the middle rod 230, and located on the positioning protrusion 234 , and the other end is fixedly installed on the flange 21 .

[Structure of PTO]

Fig. 8 is a schematic diagram of the overall structure of the power output device.

As shown in the figure, the power output device includes a power output member 3 and a support member 4 adjacent to the power output member 3. The power output member 3 has a rotation axis L3, including a rotation shaft 30 and an upward direction from the rotation shaft. Two power take-off rods 31 protrude outward, and the two power take-off rods 31 are arranged oppositely on the rotating shaft 30; The supporting part 41 protruding in the direction is also provided with a groove 41a at the end of the supporting part 41, thus, an open space S is formed between the supporting part 4 and the power output part 3, and the open space S includes the supporting part The open space S1 formed between the main body 40 and the rotating shaft 30 and the open space S2 formed between the supporting part 41 and the rotating shaft 30 allow the power output rod 31 to freely pass through.

[Incorporation and disengagement of power transmission device and power take-off device]

Fig. 9A is a schematic diagram of the installation state of the power transmission device toward the power output device; Fig. 9B is a cross-sectional view of the B-B section in Fig. 9A; Fig. 10A is a schematic diagram of the state where the power transmission device and the power output device are completely combined; Fig. 10B is a cross-sectional view of E-E in Fig. 10A cutaway view.

As shown in FIG. 9A, the power transmission device 20 moves toward the power output device along the Y direction in the figure. At this time, the movable plate 240 moves to the downstream of the flange 21 along the Y direction under the elastic force of the elastic member 243. The power receiver 23 passes through the second through hole 241 on the movable plate. Therefore, the movement of the movable plate 240 along the Y direction will drive the power receiver 23 to also move along the Y direction. At this time, the power receiver 23 is also located in the installation direction. Downstream of Y. As shown in Figure 9B, the movable plate 240 is pushed to the edge of the flange 21 by the elastic element 243, the ball 232b is located on the bottom wall 215, and the limit spring 25 is in a stretched state, thus, the elastic element 243 exerts a force on the movable plate 240. The pushing force must be greater than the pulling force exerted by the limit spring 25 on the power receiving member 23. Along the Y direction, the first end portion 231 of the power receiving member 23 is within the scope of the open space S2 as a whole, that is to say, viewed from the installation direction In addition, the first end 231 is entirely located between the end 32 of the rotating shaft 30 adjacent to the power take-off rod 31 and the free end 41b of the support portion 41, that is, in the rotation axis L2 of the power receiving member or the rotation of the rotating shaft. In the direction of the axis L3, the end 231b1 of the protruding part 231b is closer to the flange bottom wall 215 than the end 32 of the power output rod 31, and the interface 231a1 between the support table 231a and the middle rod 230 is closer than the free end of the support part. 41b is further away from the flange bottom wall 215 . At this time, the power receiving part 23 is in the retracted state, and the height relative to the bottom wall 215 in the direction of the rotation axis L2 is zero, the power transmission part 27 is located at the top 233a of the long hole, the rotation axis L1 of the flange, the power receiving part The rotation axis L2 of the rotation shaft and the rotation axis L3 of the rotation shaft are parallel to each other.

When the power receiving member 23 touches the groove 41a on the support part, the power transmission device 20 continues to move along the Y direction, and the groove 41a will exert a force along the -Y direction on the middle rod 230, the effect The force will push the power receiver 23 to move in the -Y direction, and at the same time, the power receiver 23 drives the movable plate 240 to compress the elastic element 243 to move in the -Y direction, as shown in Figures 10A and 10B, when the power receiver 23 is subjected to -Y When the force is applied in the direction, the ball 232b rolls under the drive of the power receiving member 23. Due to the existence of the tapered portion 216, the rolling of the ball 232b from the bottom wall 215 to the surface of the tapered portion 216 will make the power receiving member 23 in the The height relative to the bottom wall 215 in the direction of the rotation axis L2 gradually increases, so that the power receiving member 23 gradually protrudes, and its rotation axis L2 also gradually approaches the rotation axis L1 of the flange 21. At the same time, the rotation axis of the flange 21 L1 is also gradually approaching the rotation axis L3 of the rotation shaft 30, until the ball 232b enters the receiving portion 217 at the top of the tapered portion, at this time, the power receiving member 23 is fully extended, and a part of the supporting platform 231a enters the open space S1, The elastic element 243 is compressed, and the power transmission member 27 moves to the bottom 233b of the long hole. The rotation axis L1 of the flange, the rotation axis L2 of the power receiving member and the rotation axis L3 of the rotating shaft are coaxial, and the power receiving member 23 completes the connection with the power output member. 3, that is, the combination of the power transmission device and the power output device is completed.

When the power transmission device 20 needs to be disassembled, the flange 21 is pulled along the -Y direction, and since the power receiving part 23 is still in the state of being combined with the power output part 3, the power receiving part 23 will move to the Y direction relative to the flange 21. As the flange 21 continues to move in the -Y direction, the ball 232b on the power receiver 23 will roll along the surface of the tapered portion 216. In the direction of the rotation axis L2, the power receiver 23 is relatively The height of 215 gradually decreases, and the power receiving member 23 gradually disengages from the power output member 3 until the ball 232b reaches the bottom wall 215. At this time, the power receiving member 23 reaches the retracted position shown in FIG. 9B, that is, the power receiving member 23 Located downstream in the installation direction Y, the power transmission device is disengaged from the power output device, and the rotation axis L1 of the flange, the rotation axis L2 of the power receiver and the rotation axis L3 of the rotation shaft are parallel to each other.

[other instructions]

As described above, since the power output device includes the support member 4 disposed adjacent to the power output member 3, when the power transmission device 20 is moved in the installation direction Y, the middle rod 230 of the power receiver 23 is supported by the support member 4. The portion 41 exerts a force along the −Y direction, thereby forcing the ball 232b to roll along the surface of the tapered portion 216 .

When the power output device does not include the support member 4, but only includes the power output member 3, if the power transmission device 20 is still moved in the Y direction, the first end portion 240a and the second end portion 240b of the movable plate 240 It will touch the inner wall of the printer. Similarly, the movable plate 240 is subjected to the force in the -Y direction, and overcomes the force of the elastic element 243 to move in the -Y direction. At the same time, it drives the power receiver 23 to move in the -Y direction. At this time, the ball 232b on the power receiving part 23 moves along the surface of the tapered part 216 from the bottom wall 215 to the receiving part 217, so that the power receiving part 23 stretches out and combines with the power output part 3, and the power transmission device and the power output The combination of the device is completed; when it is necessary to disengage the power transmission device from the power output device, similarly, the flange 21 is pulled along the -Y direction, and the ball 232b rolls from the accommodating part 217 to the surface of the tapered part 216, and along the tapered The surface of the portion 216 drives the power receiving member 23 to roll toward the bottom wall 215 , so that the height of the power receiving member 23 relative to the bottom wall 215 gradually decreases, and at the same time, the power receiving member 23 is disengaged from the power output member 3 .

In summary, when the power transmission device 20 of the present invention is combined with and disengaged from the power output device provided in the printer, it does not need to rely on the force of the printer door, even if the printer door is loose or the printer door is closed. The direction is perpendicular to the X direction and the Y direction - Z direction will not affect the combination and disengagement of the power transmission device 20 and the power output device, thereby effectively ensuring that the photosensitive element or the process box on which the power transmission device 20 is installed can be widely used.

Claims (11)

1. A power transmission device, comprising a flange with a rotation axis L1, a flange bracket, a power receiving part installed in the flange, a power transmission part and a movable part, the flange bracket is used to support the flange, the The power transmission part is installed in the power receiving part, and the feature is that the power receiving part passes through the movable part, and the movable part is installed between the flange and the flange bracket. 2. A power transmission device according to claim 1, wherein the movable member comprises a movable plate, a second through hole arranged on the movable plate, and an elastic element connected to the movable plate, so that The power receiving member passes through the second through hole. 3. The power transmission device according to claim 2, wherein the elastic element abuts between the movable plate and the flange bracket. 4. The power transmission device according to claim 2, wherein the elastic element abuts between the movable plate and the flange. 5. A power transmission device according to claim 3 or 4, characterized in that, the power receiving member has a rotation axis L2, includes an intermediate rod, and first rods respectively located at two ends of the intermediate rod along the rotation axis L2. end portion and second end portion. 6 . The power transmission device according to claim 5 , wherein the intermediate rod is a cylinder, and a long hole extending along the rotation axis L2 is opened in the radial direction of the cylinder. 7 . 7. A power transmission device according to claim 6, characterized in that, the second end part comprises an extension part extending from the middle rod to a direction away from the middle rod along the rotation axis L2, and an extension part mounted on the extension part Free rolling sphere. 8 . The power transmission device according to claim 7 , wherein the extension part is a cone, wherein the bottom of the cone is connected to the middle rod, and the ball is mounted on the top of the cone. 9. A power transmission device according to claim 8, characterized in that the flange comprises a flange opening, a flange cavity, a limiting rib protruding radially inward from the inner wall of the flange cavity, The inner wall of the flange cavity protrudes radially inward and a plurality of power receiving parts extending along the rotation axis L1, the bottom wall opposite to the flange opening along the rotation axis L1, and the flange opening from the bottom wall along the rotation axis L1 An extended tapered portion and a receiving portion located at the top of the tapered portion, the receiving portion is used to accommodate a sphere. 10. A photosensitive element, characterized by comprising a photosensitive cylinder and the power transmission device according to any one of claims 1-9, wherein the power transmission device is installed at the end of the photosensitive cylinder. 11. A process cartridge, comprising the photosensitive member according to claim 10, said photosensitive member being rotatably mounted in the process cartridge.