WO2020224349A1

WO2020224349A1 - Working method of process cartridge, and process cartridge and imaging device

Info

Publication number: WO2020224349A1
Application number: PCT/CN2020/081260
Authority: WO
Inventors: 苏健强; 杨晓锋
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2019-05-07
Filing date: 2020-03-26
Publication date: 2020-11-12
Also published as: CN109946940B; CN109946940A

Abstract

A working method of a process cartridge, and the process cartridge and an imaging device. The process cartridge comprises a developing frame (21), a drum frame (31), a developing roller (22), and a photosensitive drum (4). The developing frame (21) can rotate relative to the drum frame (31). The developing roller (22) moves between an imaging position and a cleaning position relative to the photosensitive drum (4). The photosensitive drum (4) comprises a drum tube (41) and a first driving assembly (42) mounted at an axial end of the drum tube (41). The developing roller (22) comprises a roller body (221) and a second driving assembly (5) mounted at an axial end of the roller body (221). The first driving assembly (42) and the second driving assembly (5) are located on the same side of the process cartridge. The working method of the process cartridge comprises an imaging step and a cleaning step. In the imaging step, the developing roller (22) is in contact with the photosensitive drum (4), the first driving assembly (42) drives the photosensitive drum (4) to rotate, and the second driving assembly (5) drives the developing roller (22) to rotate. In the cleaning step, the developing roller (22) is separated from the photosensitive drum (4), the first driving assembly (42) drives the photosensitive drum (4) to rotate, and the second driving assembly (5) drives the developing roller (22) to rotate.

Description

Working method of processing box, processing box and imaging equipment

Technical field

The invention relates to the field of electrophotographic imaging, in particular to a working method of a processing box, a processing box and an imaging device.

Background technique

An electrophotographic imaging device usually has an image processing unit and a developing unit. Developers such as toner provided by the developing unit are used to develop the electrostatic latent image formed on the image processing unit to form a visible image on media such as paper. Among them, toner is a consumable and needs to be constantly replenished in the electrophotographic imaging equipment. Generally, a toner container with a certain amount of toner, which is detachably mounted to a developing unit in an electrophotographic image forming apparatus, is used to supply toner to the developing unit.

An existing powder cartridge includes a drive assembly, a developing roller, a stirring frame, a powder feed roller, and a photosensitive drum. The drive assembly includes a first drive assembly 11 and a second drive assembly 12. The first drive assembly 11 drives the photosensitive drum to rotate, and the second drive The assembly 12 drives the developing roller, the stirring frame and the powder feeding roller to rotate, and the second driving assembly 12 includes a clutch 121, a second driving head 122 and a driving gear 123. During the imaging of the process cartridge, the clutch 121 fixedly connects the second drive head 122 with the drive gear 123. The first drive head receives the driving force of the first drive head in the machine to drive the photosensitive drum to rotate, and the second drive head 122 receives the machine. The driving force of the second transmission head in the drive to drive the developing roller, stirring frame and powder feeding roller to rotate. When the developing cartridge is in the printing process of the machine, in order to improve the printing quality, the photosensitive drum needs to be cleaned in the printing gap. Because the photosensitive drum and the developing roller are always in contact during printing, the two need to be separated during the cleaning process. When the process cartridge is cleaning the photosensitive drum, the clutch 121 disengages the second drive head 122 from the drive gear 123, and the second drive head in the machine continues to drive the second drive head 122 to rotate, due to the drive gear 123 and the second drive head 122 Separately, the driving gear 123 stops rotating, and the developing roller, the stirring frame and the powder feeding roller all stop rotating. At this time, the first driving head in the machine continues to drive the first driving head to rotate, thereby driving the photosensitive drum to rotate and realizing the opposite Cleaning of the remaining powder.

Therefore, during imaging and cleaning, the clutch 121 needs to switch back and forth between the connecting position for connecting the driving gear 123 with the second driving head 122 and the disengaging position for separating the driving gear 123 from the second driving head 122. The middle clutch 121 is damaged, and the second transmission head cannot transmit the driving force to the developing roller, which will affect the normal use of the machine. In addition, the back and forth switching of the clutch 121 will reduce the working efficiency of the machine. If the clutch 121 is in the process of switching positions, there is no Moving to the preset position will affect the transmission of driving force between the second driving head of the machine and the second driving head 122 of the process cartridge.

Summary of the invention

technical problem

In the existing process cartridge, if the clutch is damaged, the second transmission head cannot transmit the driving force to the developing roller, which affects the normal use of the machine, and switching the clutch back and forth will reduce the working efficiency of the machine. In addition, the structure of the second driving assembly It is complicated and difficult to assemble, which will increase the cost and reduce the production efficiency of the processing box.

In order to solve the above-mentioned problems, the first object of the present invention is to provide a working method of a process cartridge that can improve the working efficiency of the process cartridge.

The second object of the present invention is to provide a process cartridge that can improve the working efficiency of the process cartridge and reduce the production cost.

The third object of the present invention is to provide an image forming apparatus having the above-mentioned process cartridge.

Technical solutions

In order to achieve the above-mentioned first objective, the present invention provides a working method of a process cartridge. The process cartridge includes a developing frame, a drum frame, a developing roller and a photosensitive drum. The developing roller is rotatably supported on the developing frame, and the photosensitive drum is rotatably supported. On the drum frame, the developing frame can rotate relative to the drum frame. The developing roller moves relative to the photosensitive drum between the imaging position and the cleaning position. In the imaging position, the developing roller contacts the photosensitive drum, and in the cleaning position, the developing roller and the photosensitive drum Separate. The photosensitive drum includes a drum and a first drive assembly mounted on one axial end of the drum. The developing roller includes a roller body and a second drive assembly mounted on one axial end of the roller body. The first drive assembly and the second drive assembly are located at The same side of the process box. The working method of the process cartridge includes an imaging step and a cleaning step; the imaging step includes: the developing roller contacts the photosensitive drum, the first driving assembly drives the photosensitive drum to rotate, and the second driving assembly drives the developing roller to rotate. The cleaning step includes: the developing roller is separated from the photosensitive drum, the first driving assembly drives the photosensitive drum to rotate, and the second driving assembly drives the developing roller to rotate.

A preferred solution is that the rotational speed of the developing roller in the imaging step is greater than the rotational speed of the developing roller in the cleaning step.

A further solution is that the rotational speed of the photosensitive drum in the imaging step is greater than the rotational speed of the photosensitive drum in the cleaning step.

A preferred solution is that during the working process of the processing box, the imaging step and the cleaning step are alternately performed.

In order to achieve the above-mentioned second object, the present invention provides a process cartridge, which is detachably installed in an imaging device. The imaging device includes a first transmission head, a second transmission head, and a driving mechanism. The driving mechanism drives the first transmission head and The second driving head rotates at the same time. The process cartridge includes a developing frame, a drum frame, a developing roller and a photosensitive drum. The developing roller is rotatably supported on the developing frame, and the photosensitive drum is rotatably supported on the drum frame. The developing frame can be rotatably supported on the drum frame. The frame rotates and the developing roller moves relative to the photosensitive drum between the imaging position and the cleaning position. In the imaging position, the developing roller contacts the photosensitive drum, and in the cleaning position, the developing roller is separated from the photosensitive drum. The photosensitive drum includes a drum and a first drive assembly mounted on one axial end of the drum. The developing roller includes a roller body and a second drive assembly mounted on one axial end of the roller body. The first drive assembly and the second drive assembly are located at On the same side of the process box, the first drive assembly is coupled with the first drive head and receives the first drive force transmitted by the first drive head, and the second drive assembly is coupled with the second drive head and receives the second drive transmitted by the second drive head force. In the imaging position, the first transmission head drives the photosensitive drum to rotate, and the second transmission head drives the developing roller to rotate. In the cleaning position, the first transmission head drives the photosensitive drum to rotate, and the second transmission head drives the developing roller to rotate.

A preferred solution is that the first drive assembly is arranged coaxially with the drum, the axis of the second drive assembly is arranged parallel to the central axis of the roller body, and the second drive assembly includes a transmission gear and a second drive head that are connected to each other. It is coaxially arranged with the second driving head.

A further solution is that the transmission gear and the second drive head are integrally formed.

A further solution is that the transmission gear is detachably fixedly connected to the second driving head.

A preferred solution is that the rotational speed of the developing roller at the imaging position is greater than the rotational speed of the developing roller at the cleaning position.

In order to achieve the above-mentioned third objective, the present invention provides an imaging device, which includes a cartridge compartment and a processing cartridge detachably installed in the cartridge compartment. The cartridge compartment is provided with a first transmission head, a second transmission head and a driving mechanism. The mechanism drives the first transmission head and the second transmission head to rotate simultaneously, and the processing box is the above-mentioned processing box.

The solution to the problem

The beneficial effects of the invention

Beneficial effect

In the cleaning step, after the developing roller and the photosensitive drum are separated, the first driving assembly still drives the photosensitive drum to rotate, while the second driving assembly still drives the developing roller to rotate. When the cleaning blade of the drum unit cleans the photosensitive drum, the developing roller moves to The imaging position, that is, the developing roller is in contact with the photosensitive drum, and the driving mechanism of the imaging device drives the first driving assembly and the second driving assembly to rotate, thereby driving the developing roller and photosensitive drum to rotate at the same time. Therefore, the switching process between the cleaning step and the imaging step is easier , It is smoother, and there will be no jamming or failure of the connection between the second drive assembly and the developing roller, and the drive cannot be transmitted to the rotating mechanism such as the developing roller. In addition, the process cartridge of the present invention simplifies the structure of the second driving assembly, makes the connecting structure of the developing roller and the second driving head simpler, and can greatly reduce the production cost.

In addition, the rotation speed of the developing roller during the cleaning step is relatively small, which can ensure that the developing roller will not transport the toner outward when cleaning the photosensitive drum.

At the same time, the imaging step and the cleaning step are alternately performed, which can improve the printing quality. When the imaging step and the cleaning step are alternately performed, the developing roller and the second transmission head are always in a connected state, which is different from the prior art. The separation in the cleaning step can greatly improve the work efficiency compared to the coupling in the imaging step, and the coupling failure of the developing roller and the second transmission head will not occur.

Brief description of the drawings

Description of the drawings

Figure 1 is a partial view of a conventional process cartridge.

Figure 2 is a structural diagram of the first embodiment of the process cartridge of the present invention.

Figure 3 is a structural diagram of the first embodiment of the process cartridge of the present invention with some parts hidden.

Figure 4 is a structural diagram of the developing unit in the first embodiment of the process cartridge of the present invention.

Figure 5 is a partial view of the developing unit in the first embodiment of the process cartridge of the present invention.

Figure 6 is a structural diagram of the second drive assembly in the second embodiment of the process cartridge of the present invention.

Figure 7 is a cross-sectional view of the second drive assembly in the second embodiment of the process cartridge of the present invention.

Figure 8 is an exploded view of the structure of the second drive assembly in the second embodiment of the process cartridge of the present invention.

The present invention will be further described below with reference to the drawings and embodiments.

Invention embodiment

Embodiments of the invention

Working method of processing box, processing box and imaging equipment first embodiment

The imaging device of this embodiment includes a cartridge compartment and a process cartridge detachably installed in the cartridge compartment. The cartridge compartment is provided with a first transmission head (not shown), a second transmission head (not shown), and a driving mechanism ( (Not shown), the driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously.

2 to 5, the process cartridge includes a developing unit 2 and a drum unit 3. The developing unit 2 includes a developing frame 21 and a developing roller 22 rotatably supported on the developing frame 21, a powder feeding roller 23, and a stirring frame 24. A force receiving part 25 is provided at the bottom of one end of the frame 21. The drum unit 3 includes a drum frame 31, a photosensitive drum 4 rotatably supported on the drum frame 31, and a cleaning blade 33 mounted on the drum frame 31. Both ends of the cleaning blade 33 are supported on the drum frame 31, and the cleaning blade 33 The blade abuts on the photosensitive drum 4 for cleaning the remaining toner on the photosensitive drum 4. The top of the end of the drum frame 31 away from the force receiving portion 25 is provided with elastic members such as a spring 34, and the first end of the spring 34 abuts on On the drum frame 31, the second end of the spring 34 abuts on the developing frame 21. The hinged position of the developing frame 21 and the drum frame 31 is located between the force receiving portion 25 and the spring 34 in the height direction of the process cartridge. An urging member (not shown) is provided. After the urging member applies a force F1 to the force receiving portion 25, the developing frame 21 rotates relative to the drum frame 31, the developing roller 22 is separated from the photosensitive drum 4, and the developing roller 22 is relative to the photosensitive drum. When the drum 4 moves to the cleaning position, the spring 34 is in a compressed state at this time; the urging member moves in the reverse direction, and after the force on the force receiving portion 25 is removed, the spring 34 pushes the developing frame 21 to rotate under the action of its own elastic restoring force , The developing roller 22 is in contact with the photosensitive drum 4, and the developing roller 22 moves relative to the photosensitive drum 4 to the imaging position.

The photosensitive drum 4 includes a drum 41 and a first driving assembly 42 installed at one axial end of the drum 41. The first driving assembly 42 includes a first driving head 422. The first driving head 422 and the drum 41 are coaxially arranged. The cross section of a driving head 422 is a triangle with a circular hole in the center. The first driving assembly 42 is coupled with the first transmission head and receives the first driving force transmitted by the first transmission head.

The developing roller 22 includes a roller body 221 and a second drive assembly 5 mounted on one axial end of the roller body 221. The first drive assembly 42 and the second drive assembly 5 are located on the same side of the process cartridge. The transmission head is coupled to and receives the second driving force transmitted by the second transmission head. A developing roller gear 222 is sleeved on one axial end of the roller body 221. The developing roller gear 222 and the roller body 221 are relatively fixed in the circumferential direction. The developing roller gear 222 can drive the roller body 221 to rotate. The second driving assembly 5 includes interconnection The transmission gear 51 and the second drive head 52 in this embodiment are integrally formed with the transmission gear 51 and the second drive head 52. The cross section of the second drive head 52 is a triangle with a circular hole in the center. The transmission gear 51 and the second drive The head 52 is arranged coaxially, and the axis of the second driving assembly 5 and the axis of the roller body 221 are parallel to each other, the transmission gear 51 is meshed with the developing roller gear 222, and the powder feeding roller 23 is provided with a powder feeding roller gear 231 at the axial end, The powder feed roller gear 231 meshes with the transmission gear 51, the axial end of the stirring frame 24 is provided with a stirring frame gear 241, and the stirring frame gear 241 is connected to the transmission gear 51 through

intermediate gears

26 and 27.

The working method of the process cartridge includes an imaging step and a cleaning step. During the working process of the process cartridge, the imaging step and the cleaning step are alternately performed.

The imaging step includes: the driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously. At this time, the developing roller 22 is in contact with the photosensitive drum 4, and the first transmission head drives the first driving assembly 42 to rotate, thereby driving the photosensitive drum 4 to rotate. The second drive head drives the second drive assembly 5 to rotate, thereby driving the developing roller 22, the powder feeding roller 23 and the stirring frame 24 to rotate. The stirring frame 24 is used to agitate the toner in the powder bin of the developing unit 2 and the powder feeding roller 23 is used In order to transport the toner in the powder bin to the developing roller 22, the developing roller 22 cooperates with the photosensitive drum 4 to perform imaging work.

The cleaning step includes: the driving mechanism drives the first transmission head and the second transmission head to rotate at the same time. At this time, after the force applying member in the imaging device applies the force F1 to the force receiving portion 25, the developing frame 21 rotates relative to the drum frame 31, The developing roller 22 is separated from the photosensitive drum 4, the first driving head drives the first driving assembly 42 to rotate, thereby driving the photosensitive drum 4 to rotate, and the second driving head drives the second driving assembly 5 to rotate, thereby driving the developing roller 22 and the powder feeding roller 23 Rotating with the stirring frame 24, the cleaning blade 33 cleans the remaining powder on the surface of the photosensitive drum 4. The rotational speed of the developing roller 22 in the imaging step is greater than the rotational speed of the developing roller 22 in the cleaning step, and the rotational speed of the photosensitive drum 4 in the imaging step is greater than the rotational speed of the photosensitive drum 4 in the cleaning step.

A second embodiment of a working method of a processing box, processing box and imaging equipment

As an explanation of the second embodiment of the working method of the process cartridge, the process cartridge and the imaging device of the present invention, the following only describes the differences from the first embodiment of the above-mentioned working method of the process cartridge, the process cartridge and the imaging device Description.

Referring to Figures 6 to 8, in this embodiment, the transmission gear 6 is detachably and fixedly connected to the second drive head 7. The second drive head 7 includes a main body portion 71, a meshing portion 72, a connecting portion 73, a drive rib 74 and a positioning部75. The engaging portion 72 and the connecting portion 73 are arranged at the first axial end of the main body portion 71, and the connecting portion 73 is connected between the engaging portion 72 and the main body portion 71. The cross-sectional shape of the engaging portion 72 is a triangle with a circular hole in the center. , The connecting portion 73 is circular in cross section, and the diameter of the connecting portion 73 is greater than or equal to the diameter of the circumscribed circle of the engaging portion 72, the driving rib 74 protrudes outward from the outer peripheral wall of the main body 71 in the radial direction of the main body 71, and The four driving ribs 74 are evenly arranged along the circumferential direction of the second driving head 7, the extending direction of the driving ribs 74 is parallel to the axial direction of the main body portion 71, and the positioning portion 75 is provided at the second axial end of the main body portion 71.

One axial end of the transmission gear 6 is provided with a positioning groove 61 and a matching groove 62. The positioning portion 75 is inserted into the positioning groove 61, and the positioning portion 75 is in interference fit with the positioning groove 61. The four matching grooves 62 are along the transmission gear 6 The driving rib 74 extends into the matching groove 62, and the driving rib 74 cooperates with the groove wall 621 of the matching groove 62 to realize the transmission of driving force.

In addition, the second driving head can also be detachably fixedly connected with the transmission gear in other ways. The number of driving ribs can also be changed as needed, and the number of matching grooves is not less than the number of driving ribs. The number of driving mechanisms in the printing device may also be two, and the two driving mechanisms respectively drive the first transmission head and the second transmission head to rotate. The second driving assembly can also be arranged coaxially with the developing roller. The above-mentioned changes can also achieve the objective of the present invention.

It can be seen from the above that in the cleaning step, after the developing roller and the photosensitive drum are separated, the first driving assembly still drives the photosensitive drum to rotate, while the second driving assembly still drives the developing roller to rotate. When the cleaning blade of the drum unit cleans the photosensitive drum, The developing roller moves to the imaging position, that is, the developing roller is in contact with the photosensitive drum, and the driving mechanism of the imaging device drives the first driving assembly and the second driving assembly to rotate, thereby driving the developing roller and the photosensitive drum to rotate at the same time.

Industrial applicability

The process of switching between the cleaning step and the imaging step of the process cartridge of the present invention is simpler and smoother, and there will be no jamming or failure of the connection between the second drive assembly and the developing roller, and the drive cannot be transmitted to the rotating mechanism such as the developing roller. on. In addition, the process cartridge of the present invention simplifies the structure of the second drive assembly, makes the connecting structure of the developing roller and the second transmission head simpler, can greatly reduce the production cost, and has good industrial applicability.

Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications, which are based on the spirit and principle of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the scope of protection of the present invention should be included.

Claims

A working method of a processing box is characterized by:

The process cartridge includes a developing frame, a drum frame, a developing roller, and a photosensitive drum. The developing roller is rotatably supported on the developing frame, the photosensitive drum is rotatably supported on the drum frame, and the developing The frame is rotatable relative to the drum frame, and the developing roller moves relative to the photosensitive drum between an imaging position and a cleaning position. In the imaging position, the developing roller is in contact with the photosensitive drum. Cleaning position, the developing roller is separated from the photosensitive drum;

The photosensitive drum includes a drum and a first drive assembly installed at one axial end of the drum. The developing roller includes a roller body and a second drive assembly installed at one axial end of the roller body. The first drive assembly and the second drive assembly are located on the same side of the process cartridge;

The working method of the process box includes an imaging step and a cleaning step;

The imaging step includes: the developing roller is in contact with the photosensitive drum, the first driving assembly drives the photosensitive drum to rotate, and the second driving assembly drives the developing roller to rotate; the cleaning step includes: The developing roller is separated from the photosensitive drum, the first driving assembly drives the photosensitive drum to rotate, and the second driving assembly drives the developing roller to rotate.
A working method of a processing box according to claim 1, wherein:

The rotation speed of the developing roller in the imaging step is greater than the rotation speed of the developing roller in the cleaning step.
A working method of a processing box according to claim 2, characterized in that:

The rotational speed of the photosensitive drum in the imaging step is greater than the rotational speed of the photosensitive drum in the cleaning step.
A working method of a processing box according to any one of claims 1 to 3, characterized in that:

During the working process of the process cartridge, the imaging step and the cleaning step are alternately performed.
The processing box is characterized by:

The process box is detachably installed in an imaging device, and the imaging device includes a first transmission head, a second transmission head, and a driving mechanism. The driving mechanism drives the first transmission head and the second transmission head simultaneously. When rotating, the process cartridge includes a developing frame, a drum frame, a developing roller, and a photosensitive drum, the developing roller is rotatably supported on the developing frame, and the photosensitive drum is rotatably supported on the drum frame, so The developing frame is rotatable relative to the drum frame, and the developing roller moves relative to the photosensitive drum between an imaging position and a cleaning position. In the imaging position, the developing roller is in contact with the photosensitive drum. In the cleaning position, the developing roller is separated from the photosensitive drum;

The photosensitive drum includes a drum and a first drive assembly installed at one axial end of the drum. The developing roller includes a roller body and a second drive assembly installed at one axial end of the roller body. The first drive assembly and the second drive assembly are located on the same side of the process cartridge. The first drive assembly is coupled with the first transmission head and receives the first driving force transmitted by the first transmission head. The second driving assembly is coupled with the second transmission head and receives the second driving force transmitted by the second transmission head;

In the imaging position, the first transmission head drives the photosensitive drum to rotate, and the second transmission head drives the developing roller to rotate;

In the cleaning position, the first transmission head drives the developing roller to rotate, and the second transmission head drives the photosensitive drum to rotate.
The process cartridge of claim 5, wherein:

The first drive assembly is arranged coaxially with the drum, the axis of the second drive assembly is arranged parallel to the central axis of the roller body, and the second drive assembly includes a transmission gear and a second drive connected to each other. Head, the transmission gear is coaxially arranged with the second driving head.
The process cartridge according to claim 6, wherein:

The transmission gear and the second driving head are integrally formed.
The process cartridge according to claim 6, wherein:

The transmission gear is detachably fixedly connected to the second driving head.
The process cartridge according to any one of claims 5 to 8, wherein:

The rotating speed of the developing roller at the imaging position is greater than the rotating speed of the developing roller at the cleaning position.
The imaging device includes a box warehouse and a processing box detachably installed in the box warehouse,

The cartridge compartment is provided with a first transmission head, a second transmission head and a driving mechanism, wherein the driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously, and the processing cartridge is The process cartridge according to any one of claims 5 to 9.