CN110850697A - process cartridge - Google Patents

Abstract

The invention provides a process cartridge, comprising a developing frame, a developing roller, a developing roller driving assembly and a separating mechanism, wherein the developing roller is rotatably supported on the developing frame, and the developing roller driving assembly includes a driving head, a transmission gear, a movable part and an elastic part One end of the developing roller is connected with a drive gear, the drive gear and the transmission gear are meshed with each other, the movable piece can be moved along the axial direction of the transmission gear and connected with the transmission gear, one end of the movable piece can be connected with the drive head, and the elastic piece forces the movable piece to approach The driving head is used for receiving the rotational force of the imaging device, and the separating mechanism can receive the force of the imaging device to make the movable member move along the axial direction of the transmission gear to separate the movable member and the driving head. The processing box has good working stability, simple structure, low production cost and high production efficiency.

Description

process cartridge

technical field

The present invention relates to the technical field of printing consumables, and in particular, to a process cartridge that is detachably mounted to an image forming apparatus.

Background technique

An electrophotographic image forming apparatus usually has an image processing unit and a developing unit. The electrostatic latent image formed on the image processing unit is developed using a developer such as toner provided by the developing unit to form a visible image on a medium such as paper. Among them, as a consumable, toner needs to be continuously replenished in the electrophotographic image forming apparatus. Generally, a process cartridge having a certain amount of toner contained in the developing unit detachably installed in the electrophotographic image forming apparatus is used to provide toner to the developing unit.

Referring to FIGS. 1 and 2, an existing process cartridge 1 includes a driving assembly, a developing roller 14, a stirring frame (not shown), a powder feeding roller (not shown) and a photosensitive drum 13. The driving assembly includes a first driving assembly 11 and a first driving assembly 11 and a first driving assembly. Two drive assemblies 12, the first drive assembly 11 drives the photosensitive drum 13 to rotate, the second drive assembly 12 drives the developing roller 14, the stirring frame and the powder feed roller to rotate, the second drive assembly 12 includes a clutch 121, a second drive head 122, a drive Gear 123 and spring 124. During the image forming process of the process cartridge 1 in the image forming apparatus, the clutch 121 and the spring 124 connect the second driving head 122 with the driving gear 123 , and the first driving assembly 11 receives the driving force of the first driving head in the image forming apparatus, thereby driving the photosensitive drum 13 When rotated, the second driving head 122 receives the driving force of the second transmission head in the image forming apparatus, thereby driving the developing roller 14, the stirring frame and the powder feeding roller to rotate. When the process cartridge 1 is printing in the image forming apparatus, in order to improve the printing quality, the photosensitive drum 13 needs to be cleaned at the printing gap. Since the photosensitive drum 13 and the developing roller 14 are always in contact during printing, during the cleaning process, the two separate. When the process cartridge 1 is cleaning the photosensitive drum 13, the clutch 121 disengages the second driving head 122 from the driving gear 123, and the second driving head in the image forming apparatus continues to drive the second driving head 122 to rotate. The drive head 122 is separated, the drive gear 123 stops rotating, and the developing roller 14, the stirring frame and the powder feeding roller all stop rotating. At this time, the first drive head in the imaging device continues to drive the first drive assembly 11 to rotate, thereby driving the photosensitive drum. 13 rotates to clean the remaining powder on the photosensitive drum 13 .

However, during the cleaning process of the existing process cartridge 1, in order to separate the photosensitive drum and the developing roller by a certain gap, the developing roller 14, the second driving assembly 12 and the developing frame rotate at a certain angle under the force of the image forming device. In order to rotate the developing roller 14 , the second driving assembly 12 and the developing frame, the entire process cartridge 1 has a complicated structure, resulting in high assembly difficulty, high production cost and low production efficiency.

SUMMARY OF THE INVENTION

In order to solve the above problems, the main purpose of the present invention is to provide a process cartridge with low production cost, high production efficiency and good working stability.

In order to achieve the above-mentioned main purpose, the present invention provides a process cartridge, which is detachably mounted to an image forming apparatus, the process cartridge includes a developing frame, a developing roller, a developing roller driving assembly and a separation mechanism, the developing roller is rotatably supported on the developing roller On the frame, the driving assembly of the developing roller includes a driving head, a transmission gear, a movable part and an elastic part. One end of the developing roller is connected with a driving gear. The driving gear and the transmission gear are meshed with each other. Gear connection, one end of the movable part can be connected with the driving head, the elastic part forces the movable part to be close to the driving head, the driving head is used to receive the rotational force of the imaging device, and the separation mechanism can receive the force of the imaging device so that the movable part can move along the transmission gear. Axial movement separates the movable member from the drive head.

It can be seen from the above scheme that the driving assembly of the developing roller includes a driving head, a transmission gear, a movable part and an elastic part, one end of the developing roller is connected with a driving gear, the driving gear and the transmission gear are meshed with each other, and the movable part can move along the axial direction of the transmission gear. Connected with the transmission gear, one end of the movable part can be connected with the drive head, the elastic part forces the movable part to be close to the drive head, the drive head is used to receive the rotational force of the imaging device, and the separation mechanism can receive the force of the imaging device so that the movable part can transmit along the transmission head. Axial movement of the gear causes separation between the movable member and the drive head. Therefore, when the image forming apparatus cleans the photosensitive drum, the separation mechanism receives the force of the image forming apparatus, so that the movable member moves along the axial direction of the transmission gear to separate the movable member and the driving head, and the developing roller stops rotating, so that the developing roller Without supplying powder to the photosensitive drum, the imaging device can clean the rotating photosensitive drum, and the working stability is good. Moreover, the structure of the process cartridge is simple, which can effectively reduce the production cost and improve the production efficiency. At the same time, when the process cartridge is placed in or taken out from the image forming apparatus, the resistance is small, and the installation or taking out operation is more convenient and labor-saving.

A further solution is that the separation mechanism includes a separation control member and a pusher, the separation control member includes a guide portion and a force-receiving portion, the force-receiving portion can receive the force of the imaging device, and the pusher is provided with a guided portion, and the force-receiving portion is provided with a guided portion. Receiving the force of the image forming apparatus, through the cooperation between the guide part and the guided part, the movable part is driven to move along the axial direction of the transmission gear, so that the movable part and the driving head are separated.

In a further solution, the process cartridge further includes a holding end cover installed on the side of the developing frame, the holding end cover is provided with a limiting hole, and the pushing member is further provided with a protrusion, and the protrusion is matched with the limiting hole.

A further solution is that the holding end cover is further provided with a limiting slot, the limiting slot extends rotatably around the axis of the transmission gear, and the separation control member further includes a limiting portion, and the limiting portion is located in the limiting slot.

Still further, the drive head is rotatably held on the holding end cap.

A further solution is that the body of the separation control member is a ring structure, the outer peripheral surface of the ring structure protrudes along the radial direction of the ring structure to form a guide portion, and the outer peripheral wall of the ring structure extends outward to form a force bearing portion, The ring structure protrudes on the end surface of the holding end cover to form a limited portion, the drive head extends along the axial direction of the transmission gear with a circular table, one end of the circular table can be connected with one end of the movable piece, and the ring structure is sleeved on the clearance fit. on the round table.

A further solution is that the body of the pusher is a circular ring structure, the end surface of the circular ring structure close to the separation control member protrudes to form a guided portion, the guided portion protrudes toward the holding end cap to form a protrusion, and the body of the movable member is a circular ring. In the boss structure, the small diameter boss of the circular boss structure can be connected with one end of the circular boss, and the circular ring structure is sleeved on the small diameter boss with clearance fit.

A further solution is that the surfaces of the guide portion and the guided portion that are in conflict with each other are inclined surfaces.

A further solution is that the transmission gear is provided with an accommodating cavity open at one end of its axial direction, the accommodating cavity is provided with a convex arm, the movable part is located in the accommodating cavity, and the large-diameter disc of the circular boss structure is provided with a through hole. The protruding arm is arranged through the through hole, the elastic member is a spring, and the spring is pressed between the bottom of the accommodating cavity and the large-diameter disc.

A further solution is that the end surface of the small-diameter boss is provided with a first ratchet tooth, and the end surface of the circular truncated platform is provided with a second ratchet tooth, and the first ratchet tooth can engage with the second ratchet tooth.

Description of drawings

FIG. 1 is a structural diagram of a conventional process cartridge.

FIG. 2 is a partially exploded view of a conventional process cartridge.

FIG. 3 is a structural diagram of an embodiment of the process cartridge of the present invention.

FIG. 4 is a first partial structural diagram of an embodiment of the process cartridge of the present invention.

FIG. 5 is a second partial structural diagram of the embodiment of the process cartridge of the present invention.

FIG. 6 is a structural diagram of a holding end cap in an embodiment of the process cartridge of the present invention.

7 is an exploded view of the cooperation of the developing roller drive assembly and the separation mechanism in the embodiment of the process cartridge of the present invention.

8 is a structural diagram of the cooperation between the developing roller driving assembly and the separating mechanism in the embodiment of the process cartridge of the present invention.

Figure 9 is a partially exploded view of the developing roller drive assembly in the embodiment of the process cartridge of the present invention.

10 is a structural diagram of a separation mechanism in an embodiment of the process cartridge of the present invention.

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

Detailed ways

3, the process cartridge 2 is detachably installed into the image forming apparatus, and the process cartridge 2 includes a drum frame 21, a developing frame 24, a photosensitive drum 22, a developing roller 25, a photosensitive drum driving assembly 23, a developing roller driving assembly, a separation mechanism, and Holding the end caps 26 , the photosensitive drum 22 is rotatably supported on the drum frame 21 , and the developing roller 25 is rotatably supported on the developing frame 24 . The photosensitive drum driving assembly 23 and the developing roller driving assembly are located on the same side of the process cartridge 2 , and the photosensitive drum driving assembly 23 is used for receiving the first rotational force of the image forming apparatus and driving the photosensitive drum 22 to rotate.

4 to 9 , the developing roller driving assembly includes a driving head 27 , a transmission gear 29 , a movable member 32 and an elastic member 33 . The movable member 32 is connected to the transmission gear 29 movably along the axial direction of the transmission gear 29, one end of the movable member 32 can be connected with the driving head 27, the elastic member 33 forces the movable member 32 to be close to the driving head 27, and the driving head 27 is used for receiving the imaging The second rotational force of the device.

Specifically, the transmission gear 29 is provided with an accommodating cavity 291 which is open at one end in the axial direction. The accommodating cavity 291 is provided with four protruding arms 292 extending in the axial direction of the transmission gear 29 , and the four protruding arms 292 surround the transmission gear 29 The axes are evenly arranged. At the same time, the bottom of the accommodating cavity 291 is protrudingly provided with a cylindrical body 293 . The movable member 32 is located in the accommodating cavity 291, and the body of the movable member 32 is a circular boss structure. The circular boss structure has a small diameter boss 322 and a large diameter disc 321 connected to each other. The end surface of the small diameter boss 322 is provided with a surrounding small diameter. The first ratchet teeth 323 of the boss 322 have a circle around the axis, the large-diameter disc 321 is provided with four through holes 324, the four through-holes 324 are evenly arranged around the axis of the large-diameter disc 321, and the four protruding arms 292 are respectively spaced The four through-holes 324 are fitted through the four through holes 324 . A ring body 325 extends axially along the transmission gear 29 on the side of the large-diameter disc 321 away from the drive head 27 , the elastic member 33 is a spring, and the two ends of the spring 33 are respectively sleeved on the cylindrical body 293 and the ring body 325 , And the spring 33 is pressed between the bottom of the accommodating cavity 291 and the large-diameter disk 321 .

The drive head 27 sequentially extends along the axial direction of the transmission gear 29 to connect the drive force receiving portion 271 , the circular table 273 and the guide rod 272 , and the guide rod 272 can move through the movable member 32 and inserted into the cylindrical body 293 inside the hole. The end surface of the circular table 273 is provided with a second ratchet tooth 274 which surrounds the axis of the circular table 273 for a circle.

6, the driving force receiving portion 271 of the driving head 27 is rotatably held on the holding hole 263 of the holding end cap 26, the holding end cap 26 is mounted on the side of the developing frame 24, and the holding end cap 26 is provided with three limiting holes. 261 and a limit slot 262 , the limit slot 262 extends rotatably around the axis of the transmission gear 29 .

4 to 10 , the separation mechanism is located between the driving force receiving portion 271 and the large-diameter disk 321, and the separation mechanism can receive the force of the image forming apparatus to move the movable member 32 relative to the driving head 27 between the contact position and the separation position . In the contact position, the movable member 32 is connected with the driving head 27 to drive the developing roller 25 to rotate. At this time, the photosensitive drum 22 is in contact with the developing roller 25 . In the separation position, the movable member 32 and the driving head 27 are separated, and the rotation of the developing roller 25 is stopped, while the photosensitive drum 22 is still in contact with the developing roller 25 at this time. That is, the separation mechanism may separate between the movable member 32 and the driving head 27 by receiving the force of the image forming apparatus to move the movable member 32 along the axial direction of the transmission gear 29 .

Specifically, the separation mechanism includes a separation control member 30 and a push member 31. The body of the push member 31 is a ring structure, and the ring structure is sleeved on the small-diameter boss 322 of the movable member 32 with clearance fit, and the ring structure is close to the separation control member. The end surface of the component 30 protrudes to form three guided parts 311 , and the three guided parts 311 protrude toward the holding end cover 26 to form protrusions 312 , and the three protrusions 312 are respectively inserted into the three limiting holes of the holding end cover 26 . 261, through the cooperation between the protrusion 312 and the limiting hole 261, the rotation of the pushing member 31 is restricted. The body of the separation control member 30 is a ring structure 302 , and the ring structure 302 is sleeved on the circular platform 273 of the driving head 27 with clearance fit. In the guide portion 303 , the three guide portions 303 and the three guided portions 311 are arranged in a staggered manner in the circumferential direction of the transmission gear 29 , and the surfaces of the guide portion 303 and the guided portion 311 that interfere with each other are inclined surfaces 306 and 313 . The outer peripheral wall of the ring structure 302 extends outward to form a force-receiving portion 301 , and the force-receiving portion 301 can receive the force of the imaging device. The end surface of the ring structure 302 close to the holding end cover 26 protrudes to form a restrained portion 304 , and the restrained portion 304 is movably located in the restraining groove 262 of the holding end cover 26 , and passes through the restrained portion 304 and the restraining portion 304 . The cooperation between the grooves 262 limits the rotation angle of the separation control member 30 and improves the working stability.

After the process cartridge 2 is installed in the image forming apparatus, in the normal printing state of the image forming apparatus, the developing roller 25 is in contact with the photosensitive drum 22, and the movable member 32 is in the contact position relative to the driving head 27, that is, the force receiving portion 301 of the separation control member 30 is not received The force applied to the imaging device, the movable member 32 and the driving head 27 are connected and cooperated, the driving head 27 receives the second rotational force of the imaging device and drives the transmission gear 29 to rotate, so that the driving gear 28 drives the developing roller 25 to rotate, while the photosensitive drum rotates. The driving assembly 23 receives the first rotational force of the image forming apparatus to drive the photosensitive drum 22 to rotate. During the printing process of the process cartridge 2, both the photosensitive drum 22 and the developing roller 25 are in a rotating state, and the developing roller 25 is in contact with the photosensitive drum 22, so that the toner is stably transferred from the developing roller 25 to the photosensitive drum 22, and further A series of exposure, development, transfer and other laser printing are realized on printing paper.

When the image forming apparatus needs to clean the photosensitive drum 22, the cleaning unit of the image forming apparatus applies a force to the force receiving part 301 of the separation control member 30 of the process cartridge 2, and as the force receiving part 301 receives the force of the image forming apparatus, the driving action The member 32 moves from the contact position to the separation position, that is, along with the force receiving part 301 of the separation control member 30 receiving the force of the imaging device, the force receiving part 301 synchronously drives the guide part 303 of the separation control member 30 to rotate, because the separation control member 30 The surfaces of the guide portion 303 that interfere with the guided portion 311 of the pusher 31 are both inclined surfaces 306 and 313, so that the pusher 31 is moved away from the drive head 27 along with the rotation of the guide portion 303, and the movable member 32 is also forced to move away from the drive head 27. The drive head 27 moves so that there is separation between the movable member 32 and the drive head 27 . At this time, the spring 33 is in a compressed state, and the driving head 27 still receives the second rotational force of the image forming apparatus and continues to rotate, but the driving head 27 is in an idling state. Due to the separation between the movable member 32 and the driving head 27, the transmission gear 29 stops rotating, so the driving gear 28 and the developing roller 25 also stop rotating, the developing roller 25 does not supply powder to the photosensitive drum 22, and the photosensitive drum driving assembly 23 drives the photosensitive drum 22. Rotate to clean its surface.

When the photosensitive drum 22 is cleaned, the separation control member 30 and the push member 31 of the process cartridge 2 are reset, and the spring 33 forces the movable member 32 to approach the driving head 27 under the action of its restoring force, so that the movable member 32 and the driving head 27 Connect and cooperate with each other, continue to drive the developing roller 25 to rotate, realize the supply of powder to the photosensitive drum 22, and then realize the continuous printing of the imaging device, effectively ensure the transfer of toner between the developing roller 25 and the photosensitive drum 22, and make the process cartridge 2 discharge powder. More uniform and stable print quality. Moreover, the structure of the process cartridge 2 is simple, which can effectively reduce the production cost and improve the production efficiency. At the same time, when the process cartridge 2 is placed in or taken out from the image forming apparatus, the resistance is small, and the installation or take-out operation is more convenient and labor-saving.

The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles of the claimed scope of the present invention shall be included in the patent of the present invention. within the scope of the application.

Claims (10)

1. A process cartridge detachably mountable to an image forming apparatus, said process cartridge including a developing frame and a developing roller rotatably supported on said developing frame, characterized in that:

the processing box also comprises a developing roller driving component and a separating mechanism, wherein the developing roller driving component comprises a driving head, a transmission gear, a moving part and an elastic part, one end of the developing roller is connected with a driving gear, and the driving gear is meshed with the transmission gear;

the movable piece is movably connected with the transmission gear along the axial direction of the transmission gear, one end of the movable piece is connected with the driving head, the elastic piece forces the movable piece to be close to the driving head, and the driving head is used for receiving the rotating force of the imaging device;

the separation mechanism may receive an urging force of the image forming apparatus so that the movable member moves in the axial direction of the transmission gear to separate between the movable member and the drive head.

2. A process cartridge according to claim 1, wherein:

the separation mechanism includes a separation control member and a pushing member, the separation control member includes a guide portion and a force receiving portion that can receive an acting force of the image forming apparatus;

the pushing piece is provided with a guided part;

and as the force bearing part receives the acting force of the image forming device, the movable part is driven to move along the axial direction of the transmission gear through the matching of the guide part and the guided part, so that the movable part and the driving head are separated.

3. A process cartridge according to claim 2, wherein:

the processing box further comprises a holding end cover arranged on the side face of the developing frame, the holding end cover is provided with a limiting hole, and the pushing piece is further provided with a protrusion matched with the limiting hole.

4. A process cartridge according to claim 3, wherein:

the separation control piece further comprises a limited part, and the limited part is located in the limited groove.

5. A process cartridge according to claim 3, wherein:

the drive head is rotatably retained on the retaining end cap.

6. A process cartridge according to claim 4, wherein:

the body of the separation control part is of a ring structure, the outer peripheral surface of the ring structure protrudes along the radial direction of the ring structure to form the guide part, the outer peripheral wall of the ring structure extends outwards to form the stress part, and the end surface of the ring structure, which is close to the holding end cover, protrudes to form the limited part;

the driving head is provided with a circular table along the axial extension of the transmission gear, one end of the circular table can be connected with one end of the movable part, and the ring body structure is sleeved on the circular table in a clearance fit manner.

7. A process cartridge according to claim 6, wherein:

the body of the pushing piece is of a circular ring structure, the circular ring structure is protruded on the end face close to the separation control piece to form the guided part, and the guided part is protruded towards the holding end cover to form the protrusion;

the body of the moving part is of a round boss structure, a small-diameter boss of the round boss structure can be connected with one end of the round platform, and the ring structure is sleeved on the small-diameter boss in a clearance fit mode.

8. A process cartridge according to claim 7, wherein:

the surfaces of the guiding part and the guided part which are in butt fit are inclined surfaces.

9. A process cartridge according to claim 7, wherein:

an accommodating cavity with an opening at one axial end is arranged on the transmission gear, and a convex arm is arranged in the accommodating cavity;

the movable piece is positioned in the accommodating cavity, a through hole is formed in the large-diameter disc of the circular boss structure, and the convex arm penetrates through the through hole;

the elastic piece is a spring, and the spring is pressed between the bottom of the accommodating cavity and the large-diameter disc.

10. A process cartridge according to any one of claims 7 to 9, wherein:

the end face of the small-diameter boss is provided with a first ratchet, the end face of the circular truncated cone is provided with a second ratchet, and the first ratchet can be meshed with the second ratchet.

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