CN213690224U

CN213690224U - Powder outlet knife, developing box and processing box

Info

Publication number: CN213690224U
Application number: CN202023086533.6U
Authority: CN
Inventors: 周欣; 刘学
Original assignee: Zhuhai Tuojia Technology Co ltd
Current assignee: Zhuhai Tuojia Technology Co ltd
Priority date: 2020-11-18
Filing date: 2020-12-18
Publication date: 2021-07-13
Anticipated expiration: 2030-12-18
Also published as: CN112506015A; CN215067730U; CN213690225U

Abstract

The utility model relates to a go out powder sword and have developing box and processing box of this go out powder sword, go out powder sword and include tool rest and blade that mutually combine, the tool rest is fixed mounting in the developing box that is provided with the developer roll, the surface contact of blade and developer roll, the developer roll is arranged with the sensitization drum outside the developing box relatively, its characterized in that, go out powder sword still includes the separation power receiver of being connected with the tool rest, the separation power receiver is closer to the rotation axis of developer roll than the tool rest; when the developing box works, the developing roller is contacted with the photosensitive drum, when the developing box does not work, the separation force receiving piece receives the separation force to force the developing roller to be separated from the photosensitive drum, when the force application part outside the developing box applies the separation force to the separation force receiving piece, the stroke of the force application part can be shortened, and meanwhile, the separation force receiving piece can also obtain larger and more stable separation force.

Description

Powder outlet knife, developing box and processing box

Technical Field

The utility model relates to an electrophotographic imaging field especially relates to a detachably installs the development box in electrophotographic imaging apparatus and has this development box's processing box, and the powder-out sword is by fixed mounting in the development box.

Background

There is a process cartridge with a toner separating structure, that is, the process cartridge is divided into a developing cartridge and a drum frame which are detachably combined, wherein the developing cartridge contains toner required for the operation of the process cartridge, and the toner is conveyed to the drum frame by a developing roller rotatably mounted in the developing cartridge, a photosensitive drum required for image formation is rotatably mounted in the drum frame, and when the developing cartridge is mounted to the drum frame, the developing roller contacts with the photosensitive drum and conveys the toner to the surface of the photosensitive drum.

When the processing box does not need to work, the developing roller and the photosensitive drum are required to be separated, so that the developing roller and the photosensitive drum are prevented from being contacted for a long time, the surface of the photosensitive drum is prevented from being polluted by the developing roller, and the surface of the developing roller is prevented from being pressed and deformed.

Generally, two longitudinal ends of the process cartridge, one for receiving the driving force and the other for receiving the electric power, and likewise, two longitudinal ends of the developing cartridge and the drum frame have the same function, respectively, and there has been developed a separation mechanism for separating the developing roller and the photosensitive drum in a case where the process cartridge is not in operation, and it has been conventionally practiced to provide the separation mechanism at both longitudinal ends of the process cartridge. When the processing box does not need to work, the separating mechanisms positioned at the two longitudinal tail ends of the processing box force the developing roller and the photosensitive drum to be separated simultaneously, the photosensitive drum and the developing roller stop rotating, when the processing box needs to work, the developing roller and the photosensitive drum are contacted again, the photosensitive drum and the developing roller rotate again, and the operation is repeated.

It follows that the conventional separation structure requires the electrophotographic image forming apparatus to continuously stop and start the operation of the driving force output part in the apparatus in accordance with the image forming conditions, which makes the control device of the electrophotographic image forming apparatus more complicated; from the viewpoint of the separation mechanism itself, the separation mechanism may be worn during the multiple separation and return-to-contact of the photosensitive drum and the developing roller, and particularly, once the separation force receiving member provided on the developing cartridge is worn, the member for applying the separation force will need to travel a larger stroke before both can come into contact.

SUMMERY OF THE UTILITY MODEL

The utility model provides a can receive the play powder sword of separating force and have this development box and the processing box that goes out the powder sword specifically as follows:

a powder discharging blade including a blade holder and a blade which are combined with each other, the blade holder being fixedly installed in a developing cartridge provided with a developing roller, the blade being in contact with an outer surface of the developing roller, the developing roller being disposed opposite to a photosensitive drum outside the developing cartridge, the powder discharging blade further including a separation force receiving member connected to the blade holder, the separation force receiving member being closer to a rotation axis of the developing roller than the blade holder; when the developing cartridge is operated, the developing roller is in contact with the photosensitive drum, and when the developing cartridge is not operated, the separation force receiving member receives a separation force to force the developing roller to be separated from the photosensitive drum.

Wherein the separation force receiving member is arranged at least one longitudinal end of the blade holder in the longitudinal direction of the doctor blade.

Preferably, the separation force receiver is a plate-like body, and a downstream end face of the separation force receiver in the mounting direction of the developing cartridge is a flat surface.

The disengagement force receiving member is connected to the tool holder by a connecting member, a portion of which is inclined with respect to the tool holder, preferably at an angle of 45 °.

The utility model provides an including as above the developing box of powder-out sword is still including being located two vertical terminal end covers of casing respectively, separation force receives the piece and does not contact with the end cover, and along the installation direction of developing box, separation force receives the piece and is located between the rotation axis of end cover and developer roll.

The utility model provides a processing box, including rotatably installing the drum frame of sensitization drum and as above development box, be provided with the application of force spare that is used for receiving the piece and applys the separating force to the separating force on the drum frame.

The separating force receiving member is provided on the doctor blade closer to the rotational axis of the developing roller, so that the stroke of the urging member can be shortened and a more stable separating force of the separating force receiving member can be secured.

Drawings

Fig. 1 is a perspective view of a developing cartridge according to an embodiment of the present invention, as viewed from a driving end.

Fig. 2 is a perspective view of a developing cartridge according to an embodiment of the present invention, as viewed from a conductive end.

Fig. 3A is an exploded view of a conductive end portion of a first developing cartridge according to an embodiment of the present invention.

Fig. 3B is an exploded view of a conductive end portion of a second developing cartridge according to an embodiment of the present invention.

Fig. 4 is a side view of the developing cartridge according to the embodiment of the present invention, as viewed from the conductive end.

Fig. 5 is a schematic diagram of a relative position of the developing cartridge according to an embodiment of the present invention and the photosensitive drum after receiving the separating force.

Fig. 6 is a perspective view of the developing cartridge according to the second embodiment of the present invention, in which the second end cap is hidden and viewed from the conductive end.

Fig. 7 is an exploded view of a conductive end portion of a developing cartridge according to a second embodiment of the present invention.

Fig. 8 is a side view of the developing cartridge according to the second embodiment of the present invention, in which the second end cap is hidden and viewed from the conductive terminal.

Fig. 9 is a side view of the developing cartridge according to the second embodiment of the present invention, as viewed from the conductive end.

Fig. 10 is a perspective view of the developing cartridge according to the second embodiment of the present invention, as viewed from the conductive end.

Fig. 11 is a partially exploded view of a developing cartridge according to a third embodiment of the present invention.

Fig. 12A is a perspective view of a doctor blade according to a third embodiment of the present invention.

Fig. 12B is a top view of the doctor blade according to the third embodiment of the present invention.

Fig. 13 is a schematic view showing a position of the separation force receiving member in the conductive terminal of the developing cartridge according to the third embodiment of the present invention.

Fig. 14 is a side view of the developing cartridge according to the third embodiment of the present invention, as viewed from the conductive end.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[ example one ]

Fig. 1 is a perspective view of a developing cartridge according to an embodiment of the present invention, as viewed from a driving end; fig. 2 is a perspective view of a developing cartridge according to an embodiment of the present invention, as viewed from a conductive end.

The developing cartridge 10 is detachably mountable to a drum stand (not shown) in a mounting direction a to form a process cartridge, and then the process cartridge is mounted to the electrophotographic image forming apparatus in a direction substantially in the same direction as a. The developing cartridge 10 includes a casing 20 and a developing roller 21 rotatably mounted in the casing 20, the developing roller 21 being located at one end of the casing 20 in a mounting direction a. As shown in the drawing, one of the longitudinal ends 20a of the developing cartridge 10 is for receiving a driving force from the electrophotographic image forming apparatus and thus may be referred to as a driving end, and the other longitudinal end 20b is for receiving electric power from the electrophotographic image forming apparatus and thus may be referred to as a conductive end, which are oppositely arranged in the longitudinal direction of the developing cartridge 10/housing 20.

The developing cartridge 10 further includes a first end cap 22 mounted at the driving end 20a, a power receiving element 31 mounted on the same side as the first end cap 22, a second end cap 23 mounted at the conductive end 20b, a counting assembly 25 and a conductive bracket 24 mounted on the same side as the second end cap 23, and a driving bracket 29 mounted on the same side as the first end cap 22, wherein a part of the power receiving element 31 is covered by the first end cap 22 and the other part is exposed from the first end cap 22 to receive a driving force from the electrophotographic image forming apparatus to rotate about a rotation axis L2, which is parallel to the rotation axis L1 and the rotation axis L2, and to drive the developing roller 21 to rotate about a rotation axis L1, which is perpendicular to the mounting direction a; the conductive bracket 24 and the driving bracket 29 support both ends of the developing roller 21, respectively, the conductive bracket 24 being electrically connected to the developing roller 21 to supply power to the developing roller 21; the counting assembly 25 operates by receiving the driving force of the power receiving part 31, and thus, the conductive terminal may also be referred to as a counting terminal.

In the present embodiment, one of the conductive end 20b and the driving end 20a of the developing cartridge 10 is provided with the separation force receiving member 32 for receiving the separation force, and the other end is no longer provided with a member for receiving the separation force, and the following description will be given mainly taking an example in which the driving end 20a is not provided with the separation force receiving member and the conductive end 20b is provided with the separation force receiving member 32.

The separation force receiving member 32 extends in the longitudinal direction of the developing cartridge, and preferably, the separation force receiving member 32 extends beyond the conductive bracket 24 but not beyond the second end cap 23 in the longitudinal direction of the developing cartridge 10, which ensures that the separation force receiving member 32 can stably receive the separation force on the one hand, and the second end cap 23 protects the separation force receiving member 32 from being broken in a direction parallel to the mounting direction a on the other hand.

Fig. 3A is an exploded view of a conductive end portion of a first developing cartridge according to an embodiment of the present invention; fig. 3B is an exploded view of a conductive end portion of a second developing cartridge according to an embodiment of the present invention; fig. 4 is a side view of the developing cartridge according to the embodiment of the present invention, as viewed from the conductive end.

The housing 20 has a tip end face 201 at the conductive end, a driving gear 26 is mounted on the tip end face 201, the driving gear 26 is used for receiving the driving force of the power receiving element 31 and driving the counting gear 251 in the counting assembly 25 to rotate, and the second end cover 23 covers at least one part of the driving gear 26 and the counting gear 251; further, the conductive holder 24 is fixedly mounted on the distal end face 201, and has a support portion 241 for supporting the developing roller 21 and an extension body 242 extending in the longitudinal direction of the developing cartridge 10 and having a through hole 243, the support portion 241 and the extension body 242 each being formed extending in the longitudinal direction of the developing cartridge 10 from the main body of the conductive holder 24.

As shown in fig. 3A and 3B, the developing cartridge 10 further includes a separation force receiver 32 provided at the conductive end and formed separately from the second end cover 23, i.e., the separation force receiver 32 is not provided on the second end cover 23, the separation force receiver 32 is located closer to the developing roller 21 than the second end cover 23 in the mounting direction a, and a gap g (an enlarged schematic view of a part R1 in fig. 4) is formed between the separation force receiver 32 and the second end cover 23, thereby shortening a stroke of movement of a member (the force applying member 9) that applies the separation force to the separation force receiver 32 and ensuring that the separation force received by the separation force receiver 32 is sufficiently large.

As shown by the broken line in fig. 4, the projection of the power receiving element 31 at the conductive end is a circle S, the separation force receiving element 32 is located between the rotation axis L1 and the rotation axis L2 in the mounting direction a, and at least a part of the separation force receiving element 32 overlaps the circle S or the developing roller 21, respectively, which is advantageous in reducing the size of the developing cartridge 10 in the mounting direction a, making the developing cartridge 10 more compact. The separation force receiving member 32 is closer to the rotation shaft axis L1 than the rotation axis L2 in the mounting direction a, and the distance between the rotation axis L1 and the separation force receiving member 32 is smaller than the distance between the separation force receiving member 32 and the drive gear 26 or the counter gear 251.

Alternatively, the separation force receiving member 32 may be fixed to the conductive bracket 24 (as shown in fig. 3A) or the housing end surface 201 (as shown in fig. 3B), and the applicant of the present invention believes that the separation force receiving member 32 is preferably disposed on the housing end surface 201 to facilitate the transmission of the separation force, and when the separation force receiving member 32 receives the separation force, the separation force can be directly transmitted to the housing 20, thereby causing the developing roller 21 located in the housing 20 to be separated from the photosensitive drum, and if the separation force receiving member 32 is disposed on the second end cover 23 or the conductive bracket 24, when the separation force is applied to the separation force receiving member 32, the separation force also needs to be transmitted to the housing 21 through the second end cover 23 or the conductive bracket 24, on one hand, the transmission path of the separation force is increased, thereby causing the loss of the separation force to be increased, on the other hand, the combination of the second end cap 23 or the conductive bracket 24 and the housing 20 needs to be reinforced to counteract the effect of the separating force on the second end cap 23 or the conductive bracket 24, so as to prevent the second end cap 23 or the conductive bracket 24 from being loosely combined with the housing 20 due to the excessive separating force.

More preferably, the separation force receiving member 32 is fixed on the distal end surface 201 and penetrates through the conductive bracket 24, which is more advantageous to reduce the strength requirement of the separation force receiving member 32 itself and the bonding strength requirement of the conductive bracket 24 and the housing 20, in which the separation force receiving member 32 transmits a part of the received separation force to the housing 20 through the conductive bracket 24 and transmits another part of the received separation force directly to the housing 20, thereby preventing the entire separation force from being applied to the separation force receiving member 32, resulting in an increase in the strength requirement of the separation force receiving member 32, and simultaneously preventing the entire separation force from being applied to the conductive bracket 24, resulting in an increase in the bonding strength requirement of the conductive bracket 24 and the housing 20.

For this, as shown in fig. 3A, the conductive holder 24 is provided with the extension 242 having the through hole 243, and the separation force receiver 32 passes through the through hole 243 and protrudes from the conductive holder 24, and thus, the extension 242 also has a restriction effect on the separation force receiver 32, preventing the separation force receiver 32 from shaking in a direction crossing the longitudinal direction of the developing cartridge 10, and at the same time, the extension 242 also has a function of dispersing the separation force transmitted from the separation force receiver 32 to the conductive holder 24, so that the separation force transmitted to the conductive holder 24 is more stable.

As another implementation, as shown in fig. 3B, the separation force receiving member 32 may also be secured to the conductive bracket 24, at which point the separation force receiving member 32 may still be considered to protrude from the conductive bracket 24; for example, the separation force receiving member 32 is formed integrally with the conductive bracket 24 and extends from the main body of the conductive bracket 24 in the direction opposite to the supporting portion 241, and at this time, only the through hole 243 through which the separation force receiving member 32 passes is provided on the conductive bracket 24 without providing the extension 242; in order to enhance the strength of the separation force receiving member 32, in the direction in which the separation force is applied by the force applying member 9 (described later), a reinforcing member 32a is provided downstream of the separation force receiving member 32 to prevent the separation force receiving member 32 from being broken when receiving the separation force; for another example, the separation force receiving member 32 is formed separately from the conductive holder 24, and in this case, the separation force receiving member 32 is fixed to the main body of the conductive holder 24 by means of screws, welding, or the like, and similarly, a reinforcing member may be provided around the separation force receiving member 32 to enhance the strength thereof.

For clearer observation, only the photosensitive drum 40 incorporated with the developing cartridge 10 is shown in fig. 5, the photosensitive drum 40 is rotatably mounted about a rotation axis L4 perpendicular to the mounting direction a in a drum stand, the other parts of which are not shown, and the developing roller 21 is disposed opposite to the photosensitive drum 40. The force applying member 9 for applying the separating force to the separating force receiving member 32 is located inside the drum stand or the electrophotographic image forming apparatus, the force applying member 9 applying the separating force to the separating force receiving member 32 in the direction opposite to the mounting direction a, and since only the conductive end 20b is provided with the separating force receiving member 32, even if the force applying member 9 corresponding to the driving end 20a is moved in the direction opposite to the mounting direction a, the developing roller 21 and the photosensitive drum 40 are kept in contact at the driving end 20a but are separated from each other at the conductive end 20 b.

As shown in the figure, the force application member 9 corresponding to the conductive end 20b applies a separating force to the separating force receiving member 32, and the developing cartridge 10 or the developing roller 21 rotates clockwise around the contact point of the developing roller 21 and the photosensitive drum 40 at the driving end 20a as the origin, so that the developing roller 21 and the photosensitive drum 40 form a state in which the driving end is in contact and the conductive end is separated, at this time, an included angle α is formed between the developing roller 21 and the photosensitive drum 40, the rotation axis L1 of the developing roller 21 and the rotation axis L4 of the photosensitive drum 40 also form an included angle α, the rotation axis L1 is no longer perpendicular to the mounting direction a, and the distance between the developing roller 21 and the photosensitive drum 40 is different from the driving end 20a to the conductive end 20b along the longitudinal direction of the developing cartridge 10, and the distance is gradually.

In the state shown in fig. 5, whether the developing roller 21 in the developing cartridge 10 or the photosensitive drum 40 in the drum frame, at the driving end 20a thereof, the driving force can be transmitted from the electrophotographic image forming apparatus at all times, and even if the process cartridge at that time does not need to be operated, the developing roller 21 and the photosensitive drum 40 can be kept rotated, and when the process cartridge needs to be operated again, the photosensitive drum 40 and the developing roller 21 in rotation can be brought into an operating state faster than the photosensitive drum 40 and the developing roller 21 of the stationary device, and then the control means in the electrophotographic image forming apparatus does not need to control the driving force output part in the apparatus to stop operating, that is, the control means does not need to control whether the driving force output part in the apparatus operates according to the state of the process cartridge, thereby simplifying the control means; further, the driving end 20a of the developing cartridge 10 is not provided with the separating force receiving member, and the urging member 9 originally used for engaging with the separating force receiving member of the driving end 20a and applying the separating force may not be provided, and the drum frame or the electrophotographic image forming apparatus is simplified in structure while material cost is saved.

[ example two ]

Fig. 6 is a perspective view of the developing cartridge according to the second embodiment of the present invention, as viewed from the conductive end.

The counting assembly 25 of the present embodiment is redesigned as shown in the figure, the counting assembly 25 includes a driving member 252, a transmission gear 253 and a toggle member 254, the developing cartridge 10 further includes an intermediate gear 26a disposed at the conductive end 20b and engaged with the driving gear 26, the transmission gear 253 is engaged with the intermediate gear 26a and the driving member 252, respectively, the driving member 252 is integrally a rack, at least one protrusion for triggering the toggle member 254 and a tooth 2523 engaged with the transmission gear 253 are provided, the protrusions are a first protrusion 2521 and a second protrusion 2522 spaced in the mounting direction a, the driving force received by the power receiving member 31 is transmitted to the driving member 252 through the driving gear 26, the intermediate gear 26a and the transmission gear 253 in order, and the driving member 252 is reciprocally movable in a direction parallel to the mounting direction a while the protrusion triggers the toggle member 254 such that the toggle member 254 rotates about a rotation axis L3 perpendicular to the rotation axis L1, i.e. the axis of rotation L3 is parallel to the mounting direction a.

The driving end 20a of the developing cartridge 10 in this embodiment is not provided with the separation force receiving member, and only the conductive end 20b is provided with the separation force receiving member 32, and likewise, the separation force receiving member 32 is not in contact with the second cap 23, and the separation force receiving member 32 is not in contact with the counter assembly 25.

FIG. 7 is an exploded view of a conductive end portion of a developing cartridge according to a second embodiment of the present invention; fig. 8 is a side view of the developing cartridge according to the second embodiment of the present invention, in which the second end cap is hidden and viewed from the conductive terminal; fig. 9 is a side view of a developing cartridge according to a second embodiment of the present invention, as viewed from a conductive end; fig. 10 is a perspective view of the developing cartridge according to the second embodiment of the present invention, as viewed from the conductive end.

The separating member 32 is a separate member detachably mounted on the conductive terminal 20b in this embodiment, and like the first embodiment, the separating member 32 may be mounted on the housing 20 or the conductive bracket 24, and no matter where the separating member 32 is mounted, the housing 20 or the conductive bracket 24 is provided with the extension 27 contacting with the separating member 32, and it is realized that the separating member 32 is detachably mounted in the extension 27.

The separating member 32 is a bending body, and includes a combining portion 323 for combining with the extending body 27, a force receiving portion 321 for receiving the separating force, and a bending portion 322 located between the combining portion 323 and the force receiving portion 321; the extension 27 extends in a direction parallel to the rotation axis L1, and may extend from the housing 20 or the conductive support 24, and the extension 27 is described as extending from the conductive support 24.

The extension body 27 extends beyond the driver 252 in the direction parallel to the rotation axis L1, but not beyond the second end cap 23, so that the extension body 27 is protected in the direction parallel to the mounting direction a, while, as shown in fig. 10, the separating member 32 combined with the extension body 27 does not interfere with the driver 252, and the size of the developing cartridge 10 is not elongated in the direction parallel to the rotation axis L1, or the longitudinal direction of the developing cartridge 10, and the whole is more compact. As shown in fig. 7, the extending body 27 is a column-shaped body having a receiving cavity 271, the coupling portion 323 is received by the receiving cavity 271, meanwhile, the extending body 27 is provided with a notch 272 on a circumferential surface adjacent to a free end thereof, and the bending portion 322 is received by the notch 272, so that, in a circumferential direction of the extending body 27, the separating member 32 is restricted by at least the first side wall 27a and the second side wall 27c of the notch 272 and cannot rotate freely; further, there is a third side wall 27b between the first side wall 27a and the second side wall 27c, so that, in the direction parallel to the rotation axis L1, the bent portion 322 is restricted by the third side wall 27b, and finally, the separate piece 32 is fixed in the extension 27.

As shown in fig. 8, the projection of the power receiving member 31 at the conductive end 20b is a circle S, and when viewed from the perspective of fig. 8, at least one of a part of the extension body 27 and a part of the force receiving portion 321 of the separating member 32 is located between the rotation axis L1 and the rotation axis L2, and at least one of a part of the extension body 27 and a part of the force receiving portion 321 of the separating member 32 is located within the range of the circle S in the mounting direction a, which is advantageous in reducing the size of the developing cartridge 10 in the mounting direction a, making the developing cartridge 10 more compact.

As shown in fig. 9, when the second end cap 23 is mounted, when viewed from the perspective of fig. 9, a part of the extension 27 overlaps the second end cap 23, a part of the coupling portion 323 of the separating member 32 and a part of the bent portion 322 also overlap the second end cap 23, but the force receiving portion 321 of the separating member 32 is located outside the second end cap 23, and a gap g is formed between the force receiving portion 321 and the second end cap 23, and the stroke of the urging member 9 when applying the separating force is shortened, thereby reducing the size of the developing cartridge 10 in the mounting direction a while ensuring that the force receiving portion 321 can stably receive a larger separating force.

As shown in fig. 7, the second end cap 23 is further provided with an escape 231, and both sides of the bent portion 322 are restricted by the notched third side wall 27b and the escape 231, respectively, in a direction parallel to the rotation axis L1 after the assembly of the developing cartridge 10 is completed, thereby further ensuring that the separating member 32 does not fall off from the extension 27.

When the urging member 9 applies the separating force to the separating member 32, the force receiving portion 321 transmits the received separating force to the housing 20, and the developing roller 21 and the photosensitive drum 40 are separated at the conductive end 20b, and since the separating member 32 is not provided in the driving end 20a, the driving end of the developing roller 21 and the driving end of the photosensitive drum 40 are still in contact (as shown in fig. 5), on the one hand, the urging member 9 corresponding to the driving end 20a does not need to be provided, and on the other hand, a control device for controlling whether the urging member 9 corresponding to the conductive end 20b operates or not can be simplified, and at this time, the control device does not need to be provided to control the urging member 9 to start or stop operating according to the state of the developing cartridge 10/process cartridge.

[ third example ]

Fig. 11 is a partially exploded view of a developing cartridge according to a third embodiment of the present invention; fig. 12A is a perspective view of a doctor blade according to a third embodiment of the present invention; fig. 12B is a top view of a doctor blade according to a third embodiment of the present invention; fig. 13 is a schematic view showing a position of a separation force receiving member in a conductive terminal of a developing cartridge according to a third embodiment of the present invention; fig. 14 is a side view of the developing cartridge according to the third embodiment of the present invention, as viewed from the conductive end.

As shown in fig. 11, the developing cartridge 10 further includes a doctor blade 28 mounted in the casing 20 and contacting the developing roller 21, the doctor blade 28 being used to adjust the thickness of the toner layer on the surface of the developing roller 21, and the separation force receiving member 32 in this embodiment is connected to the doctor blade 28, preferably, integrally formed therewith.

Generally, the doctor blade 28 is made of a metal material, when the separating force receiving member 32 is formed integrally with the doctor blade 28, this means that the separating force receiving member 32 can also be made of metal, in which case the strength of the separating force receiving member 32 is higher; of course, the separating force receiving member 32 may be formed separately from the doctor blade 28 and may be connected to the doctor blade by snapping or welding, and the two may be integrally formed as an example.

As shown, the doctor blade 28 includes a blade holder 281 and a blade 282 mounted on the blade holder 281, wherein the blade holder 281 is fixedly mounted on the casing 20, the blade 282 is in contact with the outer surface of the developing roller 21, and the separation force receiving member 32 is connected to one end of the blade holder 281, and the separation force receiving member 32 is connected to the conductive end of the blade holder 281 with respect to the orientation in which the doctor blade 28 is mounted to the casing 20.

Further, the doctor blade 28 includes an attachment member for attaching the blade holder 281 and the separation force receiving member 32, and the attachment member includes at least one of a first attachment member 283 and a second attachment member 284. In this embodiment, the attachment includes both a first attachment 283 and a second attachment 284, wherein the first attachment 283 is attached to the tool holder 281 and the second attachment 284 is attached to the separation force receiver 32; further, along the length of the powder discharging blade 28, the first link 283 extends from the blade holder 281 in a direction away from the driving end, the second link 284 extends from the first link 283 in a direction away from the driving end, and the second link 284 is bent with respect to the first link 283 or the blade holder 281, specifically, when the powder discharging blade 28 is mounted to the developing cartridge 10, the second link 284 is closer to the rotation axis L1 than the first link 283 or the blade holder 281, and the separation force receiving member 32 connected to the second link 284 is also closer to the rotation axis L1 than the first link 283 or the blade holder 281.

When the coupling includes only the first coupling 283, the separation force receiver 32 is directly coupled with the first coupling 283, and in order to enable the separation force receiver 32 to smoothly receive the separation force and to prevent the separation force receiver 32 from being deformed, which may occur, the separation force receiver 32 at this time extends obliquely from the first coupling 283, and the separation force receiver 32 is closer to the rotation axis L1 of the developing roller than the first coupling 283; when the attachment comprises only the second attachment 284, the cartridge 281 is directly connected to the second attachment 284, and likewise, the second attachment 284 is still tilted with respect to the cartridge 281 and causes the separation force receiving member 32 to be closer to the developer roller's axis of rotation L1 than the cartridge 281.

In practice, the connecting members include both the first connecting member 283 and the second connecting member 284, the first connecting member 283 is connected with the tool holder 281, which is equivalent to the tool holder 281 being extended in a direction further away from the driving end 20a, and then the starting point P of the second connecting member 284 starting to be inclined is further away from the driving end 20a, or closer to the end of the conductive end 20b, so that the separating force is closer to the conductive end 20b, and when the developing roller 21 and the photosensitive drum 40 rotate with the contact point of the two at the driving end as the origin, the separating force further away from the driving end 20a or closer to the conductive end 20b can more easily separate the developing roller 21 and the conductive end of the photosensitive drum 40.

Continuing with fig. 13, assuming that the angle between the second connector 284 and the first connector 283 is a1, the force f transmitted from the separation force receiving member 32 to the second connector 284 can be decomposed into a separation force f2 in the opposite direction to the installation direction a, and the angle between the separation force f2 and the force f is a2, satisfying: a1 ═ a2 and f2 ═ f cosa2, so that the smaller a2 is, the larger f2 is, that is, the smaller the angle between the second connector 284 and the first connector 283 is, the better is; however, in view of the possible moving direction of the separation force receiving member 32 after being applied with the separation force, it is preferable to provide the angle a1 between the second link 284 and the first link 283, if a1 is 0, that is, the second link 284 and the first link 283 are in the same plane, when the separation force receiving member 32 is subjected to the separation force, the separation force receiving member 32 may cause the second link 284 to be deformed in the direction opposite to the mounting direction a, and thereafter, the urging member 9 may no longer be able to contact the separation force receiving member 32, resulting in a failure in separation of the developing roller 21 and the photosensitive drum 40.

It follows that the angle a1 is preferably 45 deg. in view of the position of the starting point P, in combination with the inclination of the second connector 284 or the disengagement force receiving member 32 relative to the tool holder 281.

As shown in an enlarged schematic view of a part R2 in fig. 13, the separation force receiver 32 and the blade holder 281 are respectively located on both sides of the conductive holder 24 in the rotational axis L1 of the developing roller 21 or the lengthwise direction of the developing cartridge 10, while the coupling member is located between the conductive holder 24 and the casing 20 in the mounting direction a, the separation force receiver 32 is not in contact with the second cap 23 with the gap g formed therebetween, and the separation force receiver 32 is closer to the rotational axis L1 of the developing roller 21 than the blade holder 281, and therefore, the stroke when the urging member 9 applies the separation force toward the separation force receiver 32 is shortened, and the separation force receiver 32 can receive a larger separation force.

Also, the driving end 20a of the developing cartridge in the present embodiment is not provided with the separation force receiving member, and only the conductive end 20b is provided with the separation force receiving member 32, as shown in fig. 5, when the separation force receiving member 32 receives the separation force, the developing cartridge as a whole or the developing roller 21 is rotated clockwise with the contact point of the developing roller 21 and the photosensitive drum 40 at the driving end 20a as the origin, so that the developing roller 21 and the photosensitive drum 40 are brought into a state where the driving ends are in contact and the conductive ends are separated from each other, in this case, the control means in the electrophotographic image forming apparatus also does not have to control whether or not the driving force output part in the apparatus operates according to the state of the developing cartridge 10/process cartridge, thereby simplifying the control device, and at the same time, it is not necessary to provide the urging member 9 at the driving end of the drum frame or the electrophotographic image forming apparatus, thereby reducing the material cost of the drum stand or the electrophotographic image forming apparatus and simplifying the structure of the drum stand or the electrophotographic image forming apparatus.

As shown in fig. 14, at least a part of the separation force receiving member 32 is located within the projection S of the power receiving member 31 at the conductive end, and at the same time, at least a part of the separation force receiving member 32 is also located between the rotation axis L1 and the rotation axis L2, thereby reducing the size of the developing cartridge 10 in the mounting direction a; further, the separating force receiving member 32 in the present embodiment is a plate-like body, and the downstream end face of the separating force receiving member 32 in the mounting direction a is a flat surface, so that the urging member 9 is more likely to contact with the separating force receiving member 32, in other words, the separating force receiving member 32 is more likely to receive the separating force, and the mounting accuracy requirement of the urging member 9 can be greatly reduced.

As a modification of the above embodiment, the separation force receiving member 32 may be provided at the driving end 20a symmetrically to the separation force receiving member 32 provided at the conductive end 20b, and at this time, the conductive end 20b is not provided with the separation force receiving member 32. Likewise, the separation force receiving member 32 provided at the driving end 20a is not in contact with the driving end cap 22 and protrudes from the driving bracket 29, and when receiving the separation force applied by the urging member 9, the developing roller 21 is separated from the photosensitive drum 40 at the driving end 20a, and the developing roller 21 remains engaged with the photosensitive drum 40 at the conductive end 20b, at which time an angle is formed between the developing roller 21 and the photosensitive drum 40, and the distance between the developing roller 21 and the photosensitive drum 40 is different, specifically, gradually decreased, from the driving end 20a to the conductive end 20b in the longitudinal direction of the developing cartridge 10.

With the provision of the separation force receiving member 32 only at the driving end 20a, it is also possible to make it unnecessary for the control means in the electrophotographic image forming apparatus to control whether or not the driving force output part in the apparatus is operated according to the state of the process cartridge, thereby simplifying the control means, and the force applying member 9 originally corresponding to the conductive end 20b may also be unnecessary.

With respect to the powder discharging blade 28, the separating force receiving members 32 may also be provided at both the driving end 20a and the conductive end 20b along the length direction of the powder discharging blade 28, that is, two separating force receiving members 32 are provided at both longitudinal ends of the blade holder 281, respectively, and in the mounting direction a, the separating force receiving members 32 at both ends of the powder discharging blade 28 are not in contact with the respective end caps at their respective ends, and are closer to the rotation axis L1 of the developing roller 21 than the blade holder 281, the stroke when the force applying member 9 applies the separating force is shortened, and the separating force received by the separating force receiving members 32 is larger and more stable;

in the case of the color electrophotographic image forming apparatus, in order to control whether the developing roller 21 and the photosensitive drum 40 in each process cartridge operate or not, respectively, the image forming apparatus needs to be provided with one driving force output member for each developing roller 21 and photosensitive drum 40 of each process cartridge, respectively, i.e., two driving force output members for each process cartridge, which not only results in an increase in material cost of the image forming apparatus, but also results in a complicated mechanism for controlling the operation of each driving force output member in the image forming apparatus, thereby further increasing the cost of the image forming apparatus.

To the developing cartridge 10 and the process cartridge having the developing cartridge 10 of the present invention, each driving force output part in the image forming apparatus starts to work together or stops working together, and it is no longer necessary for the control device in the image forming apparatus to control whether the driving force output part corresponding to the process cartridge works according to the state of the process cartridge, and therefore, the control device in the image forming apparatus can be simplified.

Claims

1. A powder discharging blade including a blade holder and a blade which are combined with each other, the blade holder being fixedly installed in a developing cartridge provided with a developing roller, the blade being in contact with an outer surface of the developing roller, the developing roller being arranged opposite to a photosensitive drum outside the developing cartridge, characterized in that the powder discharging blade further includes a separation force receiving member connected to the blade holder, the separation force receiving member being closer to a rotation axis of the developing roller than the blade holder; when the developing cartridge is operated, the developing roller is in contact with the photosensitive drum, and when the developing cartridge is not operated, the separation force receiving member receives a separation force to force the developing roller to be separated from the photosensitive drum.

2. A doctor blade as claimed in claim 1, characterized in that the separation force receiving member is arranged at least one longitudinal end of the blade holder in the longitudinal direction of the doctor blade.

3. The doctor blade as claimed in claim 1, wherein the separation force receiver is a plate-like body, and a downstream end surface of the separation force receiver in the mounting direction of the developing cartridge is a flat surface.

4. A doctor blade as claimed in claim 1, 2 or 3, characterized in that the separation force receiving member is connected to the blade holder by means of a connecting element, a part of which is inclined with respect to the blade holder.

5. A doctor blade as claimed in claim 4, characterized in that the angle of inclination is 45 °.

6. Developing cartridge, characterized in that it comprises a housing, a developing roller rotatably mounted in the housing, and a doctor blade according to any one of claims 1 to 5.

7. A developing cartridge according to claim 6, further comprising end caps respectively at both longitudinal ends of the casing, wherein said separation force receiving member is not in contact with the end caps.

8. A developing cartridge according to claim 7, wherein the separation force receiver is located between the end cap and the rotation axis of the developing roller in the mounting direction of the developing cartridge.

9. A process cartridge, characterized in that the process cartridge comprises a drum frame to which a photosensitive drum is rotatably mounted, and the developing cartridge according to any one of claims 6 to 8, the drum frame being provided with an urging member for urging the separation force receiving member to the separation force receiving member.