CN220105520U - Process cartridge and image forming apparatus - Google Patents

Process cartridge and image forming apparatus Download PDF

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Publication number
CN220105520U
CN220105520U CN202320750837.2U CN202320750837U CN220105520U CN 220105520 U CN220105520 U CN 220105520U CN 202320750837 U CN202320750837 U CN 202320750837U CN 220105520 U CN220105520 U CN 220105520U
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CN
China
Prior art keywords
photosensitive drum
process cartridge
gear
developing roller
driving force
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Active
Application number
CN202320750837.2U
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Chinese (zh)
Inventor
杨晓锋
易新华
何永刚
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Print Rite Unicorn Image Products Co Ltd
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Print Rite Unicorn Image Products Co Ltd
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Priority to CN202320750837.2U priority Critical patent/CN220105520U/en
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Abstract

The utility model provides a processing box and imaging equipment, the processing box includes box body, photosensitive drum and developing roller, the axial end of the photosensitive drum has driving parts, the box body has concave parts near the driving parts, the driving parts include mounting seat, driving force receiving head and elastic reset parts; the elastic restoring force of the elastic restoring piece forces the driving force receiving head to rotate relative to the mounting seat so as to restore the driving force receiving head; one end of the driving force receiving head is provided with a first coupling part, the first coupling part is positioned outside the accommodating cavity and faces the concave part, the driving force receiving head is also provided with an axial limiting part and a transmission arm, the mounting seat is also provided with a limiting matching part, and the axial limiting part is in limiting matching with the limiting matching part in the axial direction of the photosensitive drum; the inner peripheral wall of the accommodating cavity is provided with a circumferential limiting part, and the transmission arm can be in limiting fit with the circumferential limiting part in the circumferential direction of the photosensitive drum. The processing box can ensure that the twisting bulge cannot be separated from the driving head, and realizes stable transmission of driving force.

Description

Process cartridge and image forming apparatus
Technical Field
The present utility model relates to the field of electrophotographic image forming technology, and more particularly, to a process cartridge and an image forming apparatus.
Background
An image forming apparatus (e.g., a laser printer) is an apparatus for forming an image on an image forming medium (e.g., paper) by at least the processes of charging, exposing, developing, transferring, fixing, and cleaning using an electrophotographic principle, and a material device of a printing consumable used on the image forming apparatus is generally called a process cartridge.
However, since there are various ways of the existing image forming apparatus to the process cartridge, in order to improve the versatility of the process cartridge, the invention patent application publication No. CN110347029a discloses a process cartridge in which a secondary gear is provided at an end of a developing roller, but it is found in practical use that when a twisting projection of a photosensitive drum in the process cartridge is engaged with a driving head having a gear, the driving head is swung to be offset due to a longer length of the driving head in the image forming apparatus or a bias arrangement of the driving head, and the free end contact of the cartridge body driving head with the driving head during the process of mounting the process cartridge, thereby making it difficult for the driving head at the end of the photosensitive drum to be engaged with the driving head correctly, and a slipping phenomenon occurs.
In the original process cartridge, the developing roller gear at the shaft end of the developing roller is a helical gear, the tooth part on the driving head of the image forming apparatus is also a helical tooth, the developing roller gear can support the driving head in the radial direction, and when the helical tooth of the driving head and the developing roller gear rotate in a state of being meshed with each other, a force F1 which enables the driving head to approach the driving head of the photosensitive drum can be generated, and simultaneously, after the twisting concave part on the driving head is engaged with the twisting convex part at the end part of the photosensitive drum, a force F2 which enables the driving head to approach the driving head of the photosensitive drum can be generated through the rotation between the driving head and the twisting concave part in the engaged state, and stable connection between the twisting concave part and the twisting convex part can be ensured under the resultant force of the forces F1 and F2, so that stable transmission of driving force is ensured.
In the process cartridge disclosed in the above patent application, since the gear engaged with the tooth portion of the driving head is eliminated, the driving head can move toward the driving head of the photosensitive drum only by the force F2, and since the force F2 is small, the length of engagement in the axial direction between the twisting concave portion of the driving head and the twisting convex portion of the end portion of the photosensitive drum is short, and at the same time, since the position of the driving head is arbitrary when the image forming apparatus is stopped, after the process cartridge is mounted, the twisting convex portion of the process cartridge and the twisting concave portion of the driving head are not completely engaged, and thus, the driving head is extremely liable to be disengaged from the twisting convex portion during rotation, thereby affecting the transmission of the driving force.
In addition, since the engagement position of the twisting concave portion of the driving head with the twisting projection of the process cartridge is generally not a correct full engagement position when the user installs the process cartridge into the image forming apparatus installation chamber, the torque at which the driving head drives the twisting projection to rotate is instantaneously increased, and since the length of the engagement of the twisting concave portion of the driving head with the twisting projection of the photosensitive drum end in the axial direction is short and there is no gear supporting the driving head, the driving head is easily caused to shake in the radial direction due to the vibration of the image forming apparatus during printing, the twisting projection is easily caused to generate a large axial separation at the incomplete engagement position, the driving head is forced to be disengaged from the twisting projection, and thus the transmission of the driving force cannot be realized.
Disclosure of Invention
A first object of the present utility model is to provide a process cartridge which ensures that a twisting projection is not disengaged from a drive head, achieving stable transmission of driving force.
A second object of the present utility model is to provide an image forming apparatus employing the above-described process cartridge.
In order to achieve the first object, the present utility model provides a process cartridge comprising a cartridge body, a photosensitive drum and a developing roller, wherein the photosensitive drum and the developing roller are rotatably supported between two end walls of the cartridge body, a transmission member is arranged at an axial end of the photosensitive drum, a recess is formed in the cartridge body near the transmission member, and the recess is recessed from an end wall of a first end of the cartridge body toward a second end of the cartridge body; the transmission part comprises a mounting seat, a driving force receiving head and an elastic resetting part; the mounting seat is arranged at the axial end of the photosensitive drum and coaxially arranged with the photosensitive drum, the mounting seat is internally provided with a containing cavity, the driving force receiving head is arranged in the containing cavity, and the elastic restoring force of the elastic restoring piece forces the driving force receiving head to rotate relative to the mounting seat so as to restore the driving force receiving head; one end of the driving force receiving head is provided with a first coupling part, the first coupling part is positioned outside the accommodating cavity and faces the concave part, the driving force receiving head is also provided with an axial limiting part, the mounting seat is also provided with a limiting matching part, and the axial limiting part is in limiting matching with the limiting matching part so that the driving force receiving head is fixed relative to the mounting seat in the axial direction of the photosensitive drum; the driving force receiving head further comprises a transmission arm, a circumferential limiting part is arranged on the inner circumferential wall of the accommodating cavity, and the transmission arm can be in limiting fit with the circumferential limiting part in the circumferential direction of the photosensitive drum.
As can be seen from the above-described arrangement, when the cartridge loader is handled, the second coupling portion of the drive head in the image forming apparatus is engaged with the first coupling portion, and since the position at which the drive head is stopped when the image forming apparatus is stopped is indefinitely, the engagement position of the first coupling portion and the second coupling portion is not the correct full engagement position, and at the same time, since the free end of the drive head can slightly swing in the radial direction, the axis of the drive head may be in an inclined state when no gear is engaged with the gear portion of the drive head in the radial direction for guiding. Then, after the image forming apparatus is operated, the driving belt drives the driving force receiving head to rotate relative to the mounting base and the photosensitive drum, and in the rotating process, the driving force receiving head applies an acting force to the elastic resetting piece, and simultaneously the first coupling part gradually rotates to a position completely clamped with the second coupling part of the driving head and is coupled with the second coupling part. Then, after the driving head continues to drive the driving force receiving head to rotate to the position where the transmission arm is abutted to the circumferential limiting piece, the driving head drives the mounting seat and the photosensitive drum to rotate, driving force transmission is achieved, and due to the buffer effect of the elastic reset piece, the driving force receiving head can be better clamped with the driving head completely, torque born by the driving force receiving head is reduced, stable connection of the driving head and the first coupling part is ensured, and the problem that in the prior art, torque for the driving head to drive the torsion bulge to rotate is increased instantaneously, so that the first coupling part is disconnected with the second coupling part of the driving head is avoided.
In a preferred scheme, a developing roller gear is arranged at the axial end of the developing roller, a photosensitive drum gear is arranged at the axial end of the photosensitive drum, and the developing roller gear is in transmission connection with the photosensitive drum gear.
It can be seen that the transmission of the driving force to the developing roller is achieved by providing the photosensitive drum gear at the end of the photosensitive drum.
The developing roller gear and the photosensitive drum gear are arranged on one side of the box body close to the transmission part; the photosensitive drum gear is fixedly connected with the mounting seat; or the photosensitive drum gear and the mounting seat are integrally formed.
Further, the developing roller gear and the photosensitive drum gear are arranged on one side of the box body far away from the transmission part.
It follows that the gear train may also be located at an end remote from the transmission member with greater design flexibility.
In a preferred embodiment, the developing roller is provided with a developing roller gear at an axial end thereof, the developing roller gear being located on a side of the first coupling portion adjacent to the recess portion in an axial direction of the photosensitive drum, at least a portion of the developing roller gear extending into the recess portion, the developing roller gear being located radially outward of the first coupling portion and adjacent to the first coupling portion in a radial direction of the photosensitive drum.
In this way, the first coupling portion may be provided with the developing roller gear on the side close to the recess portion, and the gear portion of the drive head may be engaged with the developing roller gear to transmit the rotational force to the developing roller and other members.
Preferably, the elastic restoring piece comprises an elastic piece main body, a first torsion arm and a second torsion arm; the elastic piece main body is sleeved outside the driving force receiving head, the first torsion arm is in limiting fit with the driving force receiving head in the circumferential direction of the mounting seat, and the second torsion arm is in limiting fit with the mounting seat in the circumferential direction of the mounting seat.
The first torsion arm is connected to the transmission arm, and the second torsion arm extends outwards from the peripheral wall of the elastic piece main body along the radial direction and is in limit fit with the circumferential limiting piece along the circumferential direction.
In a preferred embodiment, the driving force receiving head comprises a first coupling part, a supporting table and a connecting column which are arranged along the axial direction, a force transmission arm is arranged on the connecting column, and at least one end of the force transmission arm extends outwards from the peripheral wall of the connecting column in the radial direction; or the force transmission arm is arranged on the supporting table, is connected to the peripheral wall of the supporting table and extends along the axial direction of the driving force receiving head.
Preferably, the cross section of the first coupling part is triangular and is twisted in a counterclockwise direction from an end near the recess to an end far from the recess.
Therefore, after the first coupling part is connected with the second coupling part of the driving head, acting force towards the photosensitive drum is applied to the first coupling part along with the rotation of the driving head, so that the connection stability of the first coupling part and the driving head is ensured.
In a preferred embodiment, the process cartridge further includes a guide member mounted on the shaft core of the developing roller or on the cartridge body, the guide member being located on a side of the transmission member away from the photosensitive drum in the axial direction of the photosensitive drum, the guide member having a projection; the protrusion has a first position and a second position, when the protrusion is located at the first position, the protrusion can be in fit connection with a peripheral gear of a driving head in the image forming apparatus, the protrusion can be driven from the first position to the second position by the peripheral gear, and when the protrusion is located at the second position, the protrusion is released from fit connection with the peripheral gear.
Therefore, when the processing box is installed in the imaging equipment, the guide piece is matched with the peripheral gear of the driving head in the imaging equipment through the bulge to position, guide and support the driving head, so that the driving head can be stably and accurately engaged with the first coupling part of the transmission piece on the photosensitive drum and/or the developing roller gear on the developing roller, the driving head can stably and reliably drive the photosensitive drum and/or the developing roller to rotate, and the working stability and reliability of the processing box and the imaging equipment are ensured. In addition, the design of the processing box can also avoid excessive abrasion of the guide piece on the peripheral gear of the driving head, so that the service lives of the processing box and the driving head are prolonged.
Further, the process cartridge further includes a return mechanism coupled between the cartridge body and the guide member, the return mechanism configured to urge the projection from the second position to the first position.
It follows that the reset mechanism is provided such that when the process cartridge is taken out of the electrophotographic image forming apparatus, the reset mechanism can automatically reset the guide member, so that the projection can accurately guide and position the driving head when the process cartridge is again mounted into the electrophotographic image forming apparatus.
In order to achieve the second object, the present utility model provides an image forming apparatus including a main body in which a cartridge is provided, a driving head is provided on a sidewall of the cartridge, the driving head includes a gear portion and a second coupling portion, the gear portion is located on a peripheral wall of the driving head, and the second coupling portion is located at an axial end of the driving head, wherein the process cartridge is detachably mounted in the cartridge, the driving head extends into the recess, and the first coupling portion is engaged with the second coupling portion.
Drawings
Fig. 1 is a block diagram of a first embodiment of a process cartridge of the present utility model.
Fig. 2 is a block diagram of a first omitted part of the components of the first embodiment of the process cartridge of the present utility model.
Fig. 3 is a partial structural view of the first embodiment of the process cartridge of the present utility model after omitting part of the components.
Fig. 4 is a partial structural view of the first embodiment of the process cartridge of the present utility model after omitting part of the components.
Fig. 5 is a partial structural view of a first embodiment of the process cartridge of the present utility model.
Fig. 6 is a structural view of the first embodiment of the process cartridge of the present utility model after omitting part of the components.
Fig. 7 is a partial structural view of the second embodiment of the process cartridge of the present utility model with part of the components omitted.
Fig. 8 is a block diagram of a third embodiment of the process cartridge of the present utility model with parts of the components omitted.
Fig. 9 is a structural view of a fourth embodiment of the process cartridge of the present utility model.
Fig. 10 is a block diagram of a fourth embodiment of the process cartridge of the present utility model with parts of the components omitted.
Fig. 11 is a structural view of a guide of a fourth embodiment of the process cartridge of the present utility model.
Fig. 12 is a structural view of a first end cap of a fourth embodiment of the process cartridge of the present utility model.
Fig. 13 is a partial structural view of the fourth embodiment of the process cartridge of the present utility model with part of the components omitted.
Fig. 14 is a relative positional diagram of the first and second positions of the projection of the guide of the fourth embodiment of the process cartridge of the present utility model.
Fig. 15 is a partial structural view of a fourth embodiment of the process cartridge of the present utility model.
Fig. 16 is a block diagram of the fifth embodiment of the process cartridge of the present utility model with parts of the components omitted when the protrusions are in the first position.
Fig. 17 is a structural view of the fifth embodiment of the process cartridge of the present utility model with parts of the components omitted when the protrusions are in the second position.
Fig. 18 is a structural view of a sixth embodiment of the process cartridge of the present utility model.
Fig. 19 is a structural view of the cartridge of the sixth embodiment of the present utility model mated with the drive head after omitting part of the components.
Fig. 20 is a structural view of a second omitted part of the components of the sixth embodiment of the process cartridge of the present utility model, which is mated with the drive head.
Fig. 21 is a block diagram showing a guide member in a first position after a third omitted part assembly of the sixth embodiment of the process cartridge of the present utility model.
Fig. 22 is a structural view of a guide of a sixth embodiment of the process cartridge of the present utility model.
Fig. 23 is a block diagram of a lever of a sixth embodiment of the process cartridge of the present utility model.
Fig. 24 is a structural view of a fourth omitted part of the guide member of the sixth embodiment of the process cartridge of the present utility model in the second position.
Fig. 25 is a schematic view showing the relative positions of the first position and the second position of the projection of the sixth embodiment of the process cartridge of the present utility model.
Fig. 26 is a partial structural view of a sixth embodiment of the process cartridge of the present utility model.
Fig. 27 is a partial structural view of a sixth embodiment of the process cartridge of the present utility model after omitting part of the components.
Fig. 28 is a block diagram of a seventh embodiment of the process cartridge of the present utility model with parts of the components omitted.
Fig. 29 is a block diagram of a process cartridge according to a ninth embodiment of the present utility model before the drive head is engaged with the image forming apparatus.
Fig. 30 is a sectional view of a process cartridge according to an eighth embodiment of the present utility model after a rotational force transmitting assembly is mated with a drive head in an image forming apparatus.
Fig. 31 is a structural view of a rotational force transmitting assembly in an eighth embodiment of the process cartridge of the present utility model.
Fig. 32 is a structural exploded view of a rotational force transmitting assembly in an eighth embodiment of the process cartridge of the present utility model.
Fig. 33 is a sectional view of a rotational force transmitting assembly in an eighth embodiment of the process cartridge of the present utility model.
Fig. 34 is a block diagram of a process cartridge according to a ninth embodiment of the present utility model before the drive head is engaged with the image forming apparatus.
Fig. 35 is a structural view of a tenth embodiment of the process cartridge of the present utility model.
Fig. 36 is a perspective view of a rotational force transmitting assembly in an eleventh embodiment of the process cartridge of the present utility model.
Fig. 37 is a structural exploded view of a rotational force transmitting assembly in an eleventh embodiment of the process cartridge of the present utility model.
Fig. 38 is a left side view of a rotational force transmitting assembly in an eleventh embodiment of the process cartridge of the present utility model.
The utility model is further described below with reference to the drawings and examples.
Detailed Description
First embodiment of Process Cartridge
Referring to fig. 1 to 6, a process cartridge is detachably mounted in an image forming apparatus including a main body in which a cartridge compartment is provided, a door cover is provided on a compartment opening of the cartridge compartment, a driving head 101 is provided on a side wall of the cartridge compartment, the door cover is connected with the driving head 101, the driving head 101 protrudes toward the inside of the cartridge compartment when the door cover is closed, and the driving head 101 is retracted toward the side wall when the door cover is opened. The drive head 101 includes a peripheral gear 1011 and a second coupling portion 1012, the peripheral gear 1011 being located on a peripheral wall of the drive head 101, and the second coupling portion 1012 being located at an axial end of the drive head 101.
The process cartridge 100 includes a cartridge body 1, a developing roller 2, a photosensitive drum 3, and a guide 4. The cartridge 1 preferably includes a developing frame 11, a drum frame 12, a first end cover 13, and a second end cover 14, the developing roller 2 is rotatably mounted on both end walls of the developing frame 11 of the cartridge 1 around a first rotation axis of itself, and the developing roller 2 is provided with a developing roller gear 21. The photosensitive drum 3 is rotatably mounted on two end walls of the drum frame 12 of the box body 1 around a second rotation axis of the photosensitive drum 3, a first end of the photosensitive drum 3 is provided with a rotary force transmission assembly 30, the rotary force transmission assembly 30 comprises a transmission member 31 and a photosensitive drum gear 311, in the embodiment, the photosensitive drum gear 311 is formed on the transmission member 31, and the end part of the transmission member 31 is also provided with a first coupling part 312; of course, in other embodiments, the transmission member 31 and the photosensitive drum gear 311 may be provided relatively independently, and the transmission member 31 and the photosensitive drum gear 311 may be located at both ends of the photosensitive drum 3.
The drum frame 12 is connected to the developing frame 11 so that the developing roller 2 can abut on the photosensitive drum 3, and so that the developing roller gear 21 meshes with the photosensitive drum gear 311; wherein the first coupling portion 312 on the transmission member 31 is used for interfacing with the second coupling portion 1012 (see fig. 5) of the driving head 101 in the image forming apparatus, so that the driving head 101 can drive the photosensitive drum 3 to rotate about the second rotation axis through the transmission member 31. Preferably, the first coupling portion 312 and the second coupling portion 1012 each have a generally triangular prism shape. The first end cover 13 is mounted on the first end wall of the developing frame 11, and the first end cover 13 is covered on the developing roller gear 21, that is, the developing roller gear 21 is located between the first end wall of the developing frame 11 and the first end cover 13 and within the first end cover 13; wherein, the first end cover 13 is provided with an opening 133, so that a part of the developing roller gear 21 can be exposed outside the first end cover 13; the second end cap 14 is mounted on the second end wall of the developing frame 11. The process cartridge 100 is provided with a recess 144 near the opening 133. In this embodiment, the recess 144 is located on the first end cap 13, the recess 144 is recessed from the end wall of the first end cap 13 toward the second end cap 14, and the drive head 101 can extend into the recess 144 to engage the rotational force transmitting assembly 30.
The guide member 4 is used for guiding, positioning and supporting the driving head 101, so that after the process cartridge 100 is installed in the image forming apparatus, the second coupling portion 1012 of the driving head 101 can be accurately abutted with the first coupling portion 312 of the transmission member 31 on the photosensitive drum 3 and/or the peripheral gear 1011 of the driving head 101 can be accurately abutted with the developing roller gear 21 on the developing roller 2, and a certain supporting effect is provided for the driving head 101, so that the driving head 101 can stably and reliably drive the photosensitive drum 3 and/or the developing roller 2 to rotate, and the stability and reliability of the operation of the process cartridge 100 and the image forming apparatus are ensured.
Referring to fig. 2 and 3, in the present embodiment, the guide 4 is mounted on the shaft core of the developing roller 2, and in the axial direction of the photosensitive drum 3, the guide 4 is located on the side of the transmission member 31 away from the photosensitive drum 3; specifically, the guide 4 is located inside the first end cover 13, and the guide 4 is located between the developing roller gear 21 and the outer end surface of the first end cover 13. The guide 4 has a projection 41, which is exposed to the outside of the first end cover 13 through an opening so that the first projection can be engaged with the peripheral gear 1011 of the drive head 101 to guide, position and support the drive head 101 during the process of mounting the process cartridge 100 into the image forming apparatus. The projection 41 has a first position (shown in fig. 3) and a second position (shown in fig. 5), and when the process cartridge 100 is mounted into the image forming apparatus with the projection 41 in the first position, the projection 41 is cooperatively connected with the peripheral gear 1011 of the drive head 101. When the process cartridge 100 is mounted into the image forming apparatus and the image forming apparatus drives the process cartridge 100 for the first time, the projection 41 may be driven by the peripheral gear 1011 of the drive head 101 from the first position to the second position, and when the projection 41 is located at the second position, the projection 41 is out of the mating connection with the peripheral gear 1011. Preferably, the projection 41 is one helical tooth or one straight tooth, so that the projection 41 can be adaptively set according to the type of the peripheral gear 1011 of the driving head 101 in the image forming apparatus to enable the process cartridge 100 to be used for different types of image forming apparatuses. In conjunction with fig. 4 and 5, specifically, in the present embodiment:
The peripheral gear 1011 of the drive head 101 is a helical gear, and the projection 41 is a helical tooth. The guide member 4 further comprises a first annular portion 42 and a first limiting portion 43, the guide member 4 is sleeved on the shaft core 22 of the developing roller 2 through the first annular portion 42, and the guide member 4 can rotate around a first rotation shaft center relative to the shaft core 22, wherein the first rotation shaft center and the central line of the shaft core 22 are arranged in a collinear manner. The first limiting portion 43 is connected between the first annular portion 42 and the protrusion 41, and preferably, the first limiting portion 43 is disposed in a substantially partial annular shape, and the diameter of the first limiting portion 43 is larger than that of the first annular portion 42, so that the first limiting portion 43 is located between the first annular portion 42 and the protrusion 41 in the radial direction of the first annular portion 42. In addition, a clamping structure is formed between the first limiting portion 43 and the first annular portion 42, the first limiting portion 43 and the protrusion 41 are preferably integrally formed.
The cartridge 1 is provided with a second limiting portion 131, preferably, the second limiting portion 131 is disposed inside the first end cap 13, and the first limiting portion 43 is preferably cylindrical, and is located at a downstream end of the first limiting portion 43 along a first direction R in which the protrusion 41 rotates from the second position to the first position, so that when the protrusion 41 is located at the first position, the second limiting portion 131 is located in the clamping structure and abuts against the first limiting portion 43, and further, the guide 4 is prevented from crossing the first position, so that when the process cartridge 100 is mounted in the image forming apparatus, the protrusion 41 can be accurately engaged with the peripheral gear 1011 of the driving head 101 to accurately position and guide the driving head 101.
Here, a brief description is given of a part of the existing structure of the image forming apparatus including a main body in which a cartridge is provided, a door provided on a mouth of the cartridge, the above-described drive head 101 provided on a side wall in the cartridge, the door being connected to the drive head 101 such that when the door is closed, the drive head 101 moves in an axial direction of the photosensitive drum 3 toward a position where the process cartridge 100 is placed, and when the door is opened, the drive head 101 retracts in the axial direction of the photosensitive drum 3 toward the side wall of the cartridge. Wherein, the circumference of the driving head 101 is provided with a circumference gear 1011, the end of the driving head 101 is provided with a second coupling part 1012, in this embodiment, the first coupling part 312 is a coupling protrusion, and the second coupling part 1012 is a coupling recess.
Before the process cartridge 100 is mounted into the cartridge bay of the image forming apparatus, the projection 41 of the guide 4 is moved to the first position. Next, the process cartridge 100 is mounted in the cartridge housing, and when the door is closed, the driving head 101 is moved toward the transmission member 31 of the photosensitive drum 3 in the axial direction of the photosensitive drum 3, and when the driving head 101 is moved to the guide 4, the projection 41 of the guide 4 is engaged with the peripheral gear 1011 of the driving head 101 to guide, position and support the driving head 101, so that the driving head 101 precisely abuts the second coupling portion 1012 of itself with the first coupling portion 312 on the transmission member 31 of the photosensitive drum 3 and/or precisely engages the peripheral gear 1011 of the driving head 101 with the developing roller gear 21 on the developing roller 2 through the projection 41, to ensure that the driving head 101 stably and reliably drives the photosensitive drum 3 and/or the developing roller 2 to rotate.
When the process cartridge 100 is mounted in the cartridge bay of the image forming apparatus and the image forming apparatus is operated for the first time, as the driving head 101 rotates, the projection 41 of the guide 4 is driven by the peripheral gear 1011 of the driving head 101 from the first position to the second position such that the projection 41 is out of engagement with the peripheral gear 1011 and the projection 41 is held at the second position, thereby preventing the projection 41 from increasing the abrasion of the peripheral gear 1011 in the subsequent process while also preventing part of the driving force of the driving head 101 from being lost to the projection 41. After the process cartridge 100 is taken out from the cartridge bay of the image forming apparatus and before the process cartridge 100 is reloaded into the cartridge bay, the projection 41 of the guide 4 is restored to the first position to ensure that the projection 41 of the guide 4 is still capable of guiding, positioning and supporting the driving head 101 when the process cartridge 100 is reloaded into the cartridge bay; wherein the return of the projection 41 of the guide 4 to the first position is preferably performed by manual operation of the guide 4, but may also be driven by related mechanisms, such as some mechanism within the imaging apparatus.
Further, in conjunction with fig. 6, in the axial direction of the photosensitive drum 3, a first distance H1 between a first end face of the projection 41 near the developing roller gear 21 and an outer end face of the first end cap 13 is smaller than a second distance H2 between a second end face of the developing roller gear 21 near the projection 41 and the outer end face, and a third distance H3 between a third end face of the transmission member 41 near the outer end face and the outer end face is greater than or equal to the second distance H2. This design ensures that the guide 4 can reliably guide and position the drive head 101, and at the same time, can avoid the mutual interference between the guide 4 and the parts such as the developing roller gear 21 and the transmission member 41, thereby ensuring the reliability of the operation of the process cartridge 100.
Further, when the projection 41 is at the first rotation position, a first straight line is formed between the projection 41 and the center line of the shaft core of the developing roller 2; when the projection 41 is in the second position, a second straight line is formed between the projection 41 and the center line of the shaft core of the developing roller 2. The angle between the first straight line and the second straight line is preferably greater than or equal to 40 °, so that when the protrusion 41 is in the second position, the protrusion 41 can be completely disengaged from the engagement with the peripheral gear 1011 of the driving head 101, thereby avoiding mutual friction between the protrusion 41 and the peripheral gear 1011 of the driving head 101.
When the boss 41 is located at the first position, at least a part of the boss 41 is located in an annular region surrounded by the addendum circle of the peripheral gear 1011 and the dedendum circle of the peripheral gear, and a part of the boss 41 extends between two adjacent teeth of the peripheral gear 1011 with which it is engaged; wherein the first position is located in the circumferential direction of the photosensitive drum 3, a third straight line is formed between the center line of the shaft core of the developing roller 2 and the center line of the photosensitive drum 3, a fourth straight line is formed between the first position and the center line of the photosensitive drum 3, and an included angle between the fourth straight line and the third straight line is between 0 DEG and 15 deg. The design enables the protrusion 41 to be accurately and reliably matched with the peripheral gear 1011 of the driving head 101 so as to accurately guide and position the driving head 101; in addition, the first position of the protrusion 41 is set along the circumferential direction of the photosensitive drum 3, so that the guide member 4 has more flexible position setting conditions, and the guide member 4 can be flexibly adjusted according to the shapes and structures of different box bodies 1, so that the guide member 4 can be suitable for the box bodies 1 with different shapes and structures.
Preferably, the first annular portion 42 is in interference fit with the shaft core of the developing roller 2, and the maximum static friction force between the first annular portion 42 and the shaft core of the developing roller 2 is preferably between 0.1 newton and 30 newton, so as to prevent the guide member 4 from rotating randomly, and further ensure that the protrusion 41 of the guide member 4 can be precisely and cooperatively connected with the peripheral gear 1011 of the driving head 101 in the first position, so as to guide and position the driving head 101. Preferably, the maximum static friction between the first annular portion 42 and the shaft core of the developing roller 2 is preferably between 0.5 newton and 10 newton.
In summary, by designing the process cartridge, the process cartridge is enabled to reduce the influence on the driving force of the driving head in the image forming apparatus and to extend the life of the driving head.
Second embodiment of Process Cartridge
Referring to fig. 7, the present embodiment is different from the first embodiment of the process cartridge in that in the present embodiment, the process cartridge further includes a first return elastic member 51 connected between the guide member 52 and the shaft core 531 of the developing roller 53, the first return elastic member 51 being capable of forcing the projection 521 to rotate in a first direction by forcing the projection 521 of the guide member 52 to rotate in a first direction when the process cartridge is taken out of the image forming apparatus, so that the guide member 51 does not need to be manually returned. Preferably, the first reset elastic member 51 is a first torsion spring, the first torsion spring is sleeved on the shaft core 531 of the developing roller 53, a notch 5311 is provided on the shaft core 531, a first end of the first torsion spring 51 is clamped in the notch 5311, a first clamping portion 5221 is provided on the first annular portion 522 of the guide member 52, and a second end of the first torsion spring is clamped in the first clamping portion 5221. Of course, in other embodiments, the first reset elastic member 51 may be connected between the cartridge (e.g., the first end cap or the developing frame) and the guide member 52.
Third embodiment of Process Cartridge
Referring to fig. 8, the present embodiment is different from the first embodiment of the process cartridge in that in the present embodiment, the guide 61 further has an elastic portion 611, the elastic portion 611 is connected to the cartridge body, and the elastic portion 611 is used to force the protrusion 612 of the guide 61 to rotate in the first direction.
Preferably, the first end cover 62 of the cartridge body is provided with a second engaging portion 621, the second engaging portion 621 is located at an upstream end of the elastic portion 611 along a first direction in which the protrusion 612 of the guide 61 rotates from the second position to the first position, and when the protrusion 612 of the guide 61 is located at the first position, the elastic portion 611 of the guide 61 abuts against the second engaging portion 621, so that when the driving head of the image forming apparatus drives the protrusion 612 of the guide 61 to rotate from the first position to the second position, the elastic portion 611 is elastically deformed by the second engaging portion 621, and a force is generated that can force the protrusion 612 to rotate from the second position to the first position, so that when the process cartridge is taken out from the image forming apparatus, the elastic portion 611 forces the protrusion 612 to rotate to the first position by its own elastic potential energy, thereby eliminating the need of manually resetting the guide 61. Of course, in other embodiments, the second clamping portion 621 may be disposed on the developing frame of the cartridge; alternatively, the second engaging portion 621 may be replaced with an engaging groove that engages the elastic cloth 611. Further, the elastic portion 611 is preferably integrally formed with the first annular portion 613.
Fourth embodiment of Process Cartridge
The present embodiment is different from the first embodiment of the process cartridge in the structure of the guide, the connection object of the guide, and the like, and specifically, in the present embodiment, in combination with fig. 9 to 14:
the guide 71 is mounted on the cartridge body, and preferably, the first end cap 72 of the cartridge body is provided with a connection post 721, wherein the connection post 721 is disposed coaxially with the shaft core of the developing roller or the connection post 721 is parallel to the shaft core of the developing roller. The guide 71 has a protrusion 711, a second annular portion 712, and an abutment portion 713, the second annular portion 712 is rotatably fitted around the first rotation axis on the connection post 721, and the protrusion 711 is exposed to the outside of the first end cap 72 through the opening of the first end cap 72. The protrusion 711 and the abutment 713 are distributed around the second annular portion 712, the abutment 713 being located inside the first end cap 72 and within the first end cap 72.
The process cartridge further includes a second return elastic member connected between the abutting portion 713 and the cartridge body, the second return elastic member being for forcing the protrusion 711 to rotate toward the first position. Preferably, a second reset elastic member is connected between the first end cover 72 and the abutting portion 713 of the cartridge body, a limit post 722 is provided on the first end cover 72, the second reset elastic member preferably adopts a second torsion spring 73, the second torsion spring 73 is sleeved on the limit post 722, a first end of the second torsion spring 73 is connected with the first end cover 72, and a second end of the second torsion spring 73 is connected with the abutting portion 713 of the guide member 71, so that when the process cartridge is taken out from the image forming apparatus, the second reset elastic member can force the protrusion 711 to rotate to the first position, thereby eliminating the need of manually resetting the guide member 71.
Further, an elastic limiting portion 723 is further provided on the first end cover 72 of the case, the elastic limiting portion 723 extends toward the second annular portion 712, and the elastic limiting portion 723 is elastically deformable in the axial direction. Further, the protruding end of the elastic stopper 723 has a first guide wedge surface 7231 and a first stopper surface 7232. The second annular portion 712 of the guide 71 is provided with a third stopper 714, and the third stopper 714 has a second guide wedge surface 7141 and a second stopper surface 7142. In the first direction in which the protrusion 711 rotates from the second position to the first position, the first stopper surface 7232 is located at the upstream end of the first guide wedge surface 7231, the third stopper 714 is located at the upstream end of the abutment 713, and the second guide wedge surface 7141 is located at the upstream end of the second stopper surface 7142. And, when the protrusion 711 is located at the first position, the first guide wedge 7231 abuts the second guide wedge 7141; when the protrusion 711 is in the second position, the first stop surface 7232 abuts the second stop surface 7142.
The arrangement is such that when the driving head driving protrusion 711 is rotated from the first position to the second position, the third stopper 714 forces the elastic stopper 723 to move inward of the first end cap 72 in the axial direction of the developing roller by the first guide wedge 7231 and the second guide wedge 7141, thereby causing the third stopper 714 to pass over the end of the elastic stopper 723 and compressing and storing the second torsion spring 73. When the projection 711 is driven to the second position, the elastic stopper 723 moves outward of the first end cap 72 in the axial direction of the developing roller to return to the initial position, and the abutment 713 of the guide 71 is forced to rotate toward the first position by the elastic potential energy of the second torsion spring 73. When the guide 71 rotates to the first position, the second limiting surface 7142 of the third limiting portion 714 of the guide 71 will abut against the first limiting surface 7232 of the elastic limiting portion 723 to limit the protrusion 711 to the second position, so that the elastic limiting portion 723 limits the protrusion 711 to continue to rotate to the first position, thereby preventing the protrusion 711 from abutting against the peripheral gear of the driving head, preventing the protrusion 711 and the peripheral gear from wearing each other, and prolonging the service lives of the guide 71 and the driving head.
When the process cartridge is taken out of the image forming apparatus, the elastic stopper 723 is pressed by the existing structure of the cartridge of the image forming apparatus (e.g., the inner side surface of the cartridge) to move toward the inner side of the first end cap 72 in the axial direction of the developing roller, and the second stopper 7142 of the third stopper 714 of the guide 71 is further separated from contact with the first stopper 7232 of the elastic stopper 723, so that the guide 71 moves the third stopper 714 beyond the elastic stopper 723 under the action of the elastic potential energy of the second torsion spring 73, and finally the protrusion 711 of the guide 71 is rotated to the first position, thereby completing automatic reset of the protrusion 711. Preferably, the elastic limiting portion 723 is provided with an abutment protrusion 7233, and the abutment protrusion 7233 extends outward of the first end cover 72 in the axial direction of the developing roller, so that the existing structure in the cartridge can better force the elastic limiting portion 723 to move inward of the first end cover 72 in the axial direction of the developing roller during the process of taking out the process cartridge from the cartridge, thereby ensuring that the third limiting portion 714 can go beyond the elastic limiting portion 723. Of course, in other embodiments, the elastic stopper 723 may be provided on the developing frame or other components to achieve the same function.
Further, when the protrusion 711 is in the first position, a first straight line L1 is formed between the protrusion 711 and the rotation axis of itself; when the protrusion 711 is in the second position (as shown by the short dashed line portion in fig. 13), a second straight line L2 is formed between the protrusion 711 and the rotation axis of itself. The angle a between the first line L1 and the second line L2 is preferably greater than or equal to 40 °, so that when the protrusion 711 is in the second position, the protrusion 711 can be completely disengaged from the peripheral gear of the driving head, thereby avoiding mutual friction between the protrusion 711 and the peripheral gear of the driving head.
Further, referring to fig. 15, when the protrusion 711 is located at the first position, at least a part of the protrusion 711 is located in an annular region S surrounded by the tooth top circle of the peripheral gear of the drive head and the tooth root circle of the peripheral gear, and a part of the protrusion 711 extends between two adjacent teeth of the peripheral gear which are engaged with the protrusion 711; the first position is located in the circumferential direction of the photosensitive drum, a third straight line L3 is formed between the center line of the shaft core of the developing roller and the center line of the photosensitive drum, a fourth straight line L4 is formed between the first position I and the center line of the photosensitive drum 3, and an included angle b between the fourth straight line L4 and the third straight line L3 is between 0 and 15 degrees. The design enables the protrusion 711 to be accurately and reliably matched with the peripheral gear of the driving head so as to accurately guide and position the driving head; in addition, the first position of the protrusion 711 is set along the circumferential direction of the photosensitive drum, so that the guide member 71 has more flexible position setting conditions, and the guide member 71 can be flexibly adjusted according to the shapes and structures of different box bodies, so that the guide member 71 can be suitable for the box bodies with different shapes and structures.
Preferably, the second annular portion 712 is in interference fit with the connecting post 721, and the maximum static friction between the second annular portion 712 and the connecting post 721 is preferably between 0.1 newton and 30 newton, so as to prevent the guide member 71 from rotating randomly, and further ensure that the protrusion 711 of the guide member 71 can be precisely and cooperatively connected with the peripheral gear of the driving head in the first position, so as to guide and position the driving head. Preferably, the maximum static friction between the second annular portion 712 and the connecting post 721 is preferably between 0.5 newton and 10 newton.
Fifth embodiment of Process Cartridge
The present embodiment is different from the fourth embodiment of the process cartridge in the structure of the guide, the connection object of the guide, the structure of the reset mechanism, and the like, and specifically, in the present embodiment, in combination with fig. 16 and 17:
the guide 82 is preferably mounted on the first end cap 81 of the cartridge body, the first end cap 81 being provided with a second connecting post 811, the second connecting post 811 being provided coaxially with the axis of the developing roller, or the second connecting post 811 being parallel to the axis of the developing roller. The guide 82 has a third annular portion 821, a receiving portion 822, and a protrusion 823, the third annular portion 821 is rotatably fitted over the second connection post 811 and is interference fit with the second connection post 811, and the protrusion 823 is exposed to the outside of the first end cover 81 through the opening of the first end cover 81. The boss 823 and the deflector 822 are distributed around the third annular portion 821, with the deflector 822 being located within the first end cap 81. In this embodiment, the protrusion 823 preferably employs a helical tooth; of course, in other embodiments, the protrusion 823 may be a straight tooth.
The process cartridge further includes a return mechanism 863, and the return mechanism 83 includes a lever 831 and a third return elastic member 832, the lever 831 being slidably mounted on the cartridge body, the third return elastic member 832 being connected between the cartridge body and the lever 831. The third reset elastic member 832 may force the lever 831 to toggle the portion 822 to control the protrusion 823 to rotate in a first direction, which is a direction in which the protrusion 823 rotates from the second position to the first position. The shift lever 831 has a shift portion 8311, and a fourth limiting portion 812 is disposed on the first end cover 81 of the case. Along the first direction, the fourth limiting portion 812 is located at the downstream end of the dialed portion 822; the first end of the shifting lever 831 extends out of the first end cover 81 from the inside of the first end cover 81, a shifting portion 8311 is formed at the second end of the shifting lever 831, the shifting portion 8311 can be adjacent to the shifted portion 822, the shifting lever 831 is slidably connected with the first end cover 81, so that the shifting portion 8311 can shift the guide member 82 to rotate through the shifted portion 822 to control the protrusion 823 of the guide member 82 to rotate to the first position; the toggle portion 8311 has a third position and a fourth position.
The third return elastic member 832 preferably employs a compression spring, which in this embodiment is disposed outside the first end cap 81, the compression spring being sleeved on the lever 831, the compression spring being connected between the first end of the lever 831 and the first end cap 81. The third reset elastic member 832 is configured to force the poking portion 8311 of the poking lever 831 to move from the third position to the fourth limiting portion 812, so that the poking portion 8311 pokes the poking portion 822 of the guiding member 82 to move to the fourth limiting portion 812, and further drives the protrusion 823 of the guiding member 82 to rotate to the first position. When the third reset elastic member 832 drives the poking portion 8311 to move to the third position, the poking portion 822 is abutted between the poking portion 8311 and the fourth limiting portion 812. At this time, the fourth limiting portion 812 plays a role of preventing the protrusion 823 from excessively moving, so as to prevent the protrusion 823 from crossing the first position and failing to accurately guide and position the driving head.
When the protrusion 823 of the guide member 82 is driven by the peripheral gear of the driving head to rotate to the second position, the poking part 822 of the guide member 82 forces the poking part 8311 to move to the fourth position, and the third reset elastic member 832 is charged. When the protrusion 823 is driven to the second position, the poking part 822 forces the poking part 8311 to be kept at the fourth position, and the third reset elastic member 832 is in an energy storage state, so that when the process cartridge is taken out from the imaging device, the third reset elastic member 832 can force the poking part 8311 of the poking rod 831 to move to the third position, so that the protrusion 823 of the guide member 82 is driven to the first position, and automatic reset of the guide member 82 is realized.
In addition, the second connecting post 811 and the third annular portion 821 are in interference fit, and the maximum static friction force between the second connecting post 811 and the third annular portion 821 is between 0.1 newton and 30 newton, so that the guide 82 is prevented from rotating at will, and further, the protrusion 823 of the guide 82 can be accurately matched and connected with the peripheral gear of the driving head at the first position, and meanwhile, the guide 82 can be prevented from falling off from the second connecting post 811. Preferably, the maximum static friction between the second connecting post 811 and the third annular portion 821 is between 0.5 newton and 10 newton.
When the process cartridge is mounted in the cartridge bay of the image forming apparatus and the image forming apparatus is operated for the first time, as the driving head rotates, the protrusion 823 of the guide member 82 is driven by the peripheral gear of the driving head from the first position to the second position, while the guide member 82 drives the poking portion 8311 to the fourth position through the poking portion 822 and the poking portion 8311 of the poking lever 831, and the third reset elastic member 832 is in the energy storage state. After the process cartridge is taken out of the cartridge compartment of the image forming apparatus, the poking portion 8311 of the poking lever 831 pokes the poking portion 822 of the guide member 82 under the action of the elastic potential energy of the third reset elastic member 832, so that the protrusion 823 of the guide member 82 rotates to the first position, and automatic reset of the guide member 82 is achieved, so that when the process cartridge is again loaded into the cartridge compartment, the protrusion 823 of the guide member 82 can guide, position and support the driving head.
It should be noted that, in other embodiments, the guide 82 may be slidably mounted on the case (such as the first end cover or the developing frame, etc.), so that the protrusion 823 of the guide 82 may be slidably moved between the first position and the second position, and when the guide 82 is slidably mounted on the case, the case is further provided with a reset mechanism for forcing the protrusion 823 of the guide 82 to slidably reset from the second position to the first position.
Sixth embodiment of the Process Cartridge
The present embodiment is different from the first embodiment of the process cartridge in that in the present embodiment, referring to fig. 18 to 22, the process cartridge further includes a reset mechanism 95, and a guide 94 is mounted on the cartridge body 91, preferably, a connection post 9131 is provided on a first end cap 913 of the cartridge body 91. The connection post 9131 is preferably disposed coaxially with the axis of the developing roller 92; or the connection posts 9131 are disposed offset from the axis of the developing roller 92, and the connection posts 9131 are preferably parallel to the axis of the developing roller 92. The guide member 94 has an annular portion 941, a receiving portion 942, and a protrusion 943, the annular portion 941 is rotatably fitted around the rotation axis of the connection post 9131 on the connection post 9131, and the protrusion 943 is exposed from the first end cap 913 through the opening of the first end cap 913. Wherein the protrusions 943 and the dialed portions 942 are distributed around the annular portion 941, and the dialed portions 942 are located in the first end; the protrusion 943 has a first position (as shown in fig. 18-21) and a second position (as shown in fig. 24). Further, the projection 943 in the present embodiment is a helical tooth; of course, in other embodiments, the projection 943 may be a straight tooth or other shape.
Referring to fig. 23, the reset mechanism 95 includes a lever 951 and a reset elastic member 952, wherein the lever 951 is slidably mounted on the box 91, the reset elastic member 952 is connected between the box 91 and the lever 951, and the reset elastic member 952 can force the lever 951 to toggle the toggling portion 942 to control the protrusion 943 to rotate along a first direction R, which is a direction in which the protrusion 943 moves from the second position to the first position.
Preferably, the lever 951 has a toggle portion 9511, an engaging portion 9512, and a second limiting portion 9513, and a limiting portion 9132, a sliding slot 9133, and a through hole 9134 are disposed on the first end cover 913 of the case 91. Wherein, along the first direction R, the limiting portion 9132 is located at a downstream end of the dialing portion 942; the first end of the lever 951 extends from the inside of the first end cap 913 to the outside of the first end cap 913 through the through hole 9134, the toggle portion 9511 and the engaging portion 9512 are both located at the second end of the lever 951, the second limiting portion 9513 is formed at the end of the lever 951, and the toggle portion 9511 can be adjacent to the dialed portion 942. The shift lever 951 is connected with the sliding groove 9133 of the first end cover 913 through the clamping portion 9512, so that the shift lever 951 can slide along the sliding groove 9133, and further the shift portion 9511 can shift the guide member 94 around the connecting column 9131 through the shift receiving portion 942 to control the tooth-shaped protrusion 943 of the guide member 94 to move to the first position; the toggle portion 9511 has a third position (as shown in fig. 18 to 21) and a fourth position (as shown in fig. 24).
The return elastic member 952 is preferably a compression spring, which is disposed outside the first end cap 913 in this embodiment, and is sleeved on the lever 951 and located between the second limiting portion 9513 and the first end cap 913; the first end of the compression spring abuts against the second limiting portion 9513, and the second end of the compression spring abuts against the first end cap 913.
The reset elastic member 952 is used for forcing the shifting portion 9511 of the shift lever 951 to move toward the third position, so that the shifting portion 9511 shifts the shifted portion 942 of the guide member 94 toward the limiting portion 9132, and further drives the protrusion 943 of the guide member 94 to move toward the first position. When the reset elastic member 952 drives the toggle portion 9511 to move to the third position, the driven portion 942 abuts between the toggle portion 9511 and the limiting portion 9132. At this time, the limiting portion 9132 plays a role of preventing the protrusion 943 from excessively moving, so as to prevent the protrusion 943 from crossing the first position and failing to accurately guide and position the driving head 9101.
When the protrusion 943 of the guide 94 is driven by the peripheral gear 91011 of the driving head 9101 to move to the second position, the dialed portion 942 of the guide 94 forces the dial portion 9511 to move to the fourth position and causes the reset spring 952 to store energy. When the protrusion 943 is driven to the second position, the poking part 942 forces the poking part 9511 to maintain the fourth position, and the reset elastic member 952 is in the energy storage state. It can be seen that when the protrusion 943 is driven from the first position to the second position, the poking portion 942 of the guide member 94 can move the poking portion 9511 of the poking lever 951 to the fourth position, so that the reset elastic member 952 is in the energy storage state, so as to ensure that when the process cartridge 9100 is taken out from the image forming apparatus, the reset elastic member 952 can force the poking portion 9511 of the poking lever 951 to move to the third position, so as to drive the protrusion 943 of the guide member 94 to the first position, thereby realizing automatic reset of the guide member 94.
In addition, an interference fit is adopted between the connection post 9131 and the annular portion 941, and the maximum static friction force between the connection post 9131 and the annular portion 941 is preferably between 0.1 newton and 30 newton, so as to prevent the guide member 94 from rotating randomly, and further ensure that the protrusion 943 of the guide member 94 can be precisely matched and connected with the peripheral gear 91011 of the driving head 9101 in the first position, so as to play a guiding and positioning role on the driving head 9101, and prevent the guide member 94 from being separated from the connection post 9131. Preferably, the maximum static friction between the connecting post 9131 and the annular portion 941 is between 0.5 newton and 10 newton.
When the process cartridge 9100 is mounted in a cartridge bay of an image forming apparatus and the image forming apparatus is operated for the first time, as the driving head 9101 rotates, the boss 943 of the guide 94 is driven by the shaft gear of the driving head 9101 from the first position to the second position, and at the same time the guide 94 drives the lever 951 to the fourth position via the plucking part 942 and the plucking part 9511 of the lever 951, and the return elastic member 952 is brought into the energy storage state. When the process cartridge 9100 is taken out of the cartridge compartment of the image forming apparatus, the pulling portion 9511 of the pulling lever 951 pulls the pulled portion 942 of the guide member 94 under the action of the elastic potential energy of the reset elastic member 952, so that the protrusion 943 of the guide member 94 rotates to the first position, and automatic reset of the guide member 94 is achieved, so that the protrusion 943 of the guide member 94 still can guide, position and support the driving head 9101 when the process cartridge 9100 is mounted in the cartridge compartment again.
Referring to fig. 25, when the protrusion 943 is at the first position, a first straight line L1 is formed between the protrusion 943 and its rotation axis; when the projection 943 is in the second position (shown in a portion indicated by a short dashed line in fig. 25), a second straight line L2 is formed between the projection 943 and its own rotation axis. The angle a between the first straight line L1 and the second straight line L2 is preferably greater than or equal to 40 °, so that when the protrusion 943 is in the second position, the protrusion 943 can be completely disengaged from the shaft gear of the driving head 9101, thereby avoiding friction between the protrusion 943 and the peripheral gear 91011 of the driving head 9101.
Referring to fig. 26, when the protrusion 943 is in the first position, at least a part of the protrusion 943 is located in an annular region S surrounded by the addendum circle of the peripheral gear 91011 of the drive head 9101 and the dedendum circle of the peripheral gear 91011, and a part of the protrusion 943 extends between two adjacent teeth of the peripheral gear 91011 which are engaged with itself; wherein the first position is located in the circumferential direction of the photosensitive drum 93, a third straight line L3 is formed between the center line of the shaft core of the developing roller 92 and the center line of the photosensitive drum 93, a fourth straight line L4 is formed between the first position I and the center line of the photosensitive drum 33, and an included angle b between the fourth straight line L4 and the third straight line L3 is between 0 ° and 15 °. This design allows the projection 943 to accurately and reliably mate with the peripheral gear 91011 of the drive head 9101 to accurately guide and position the drive head 9101; in addition, the first position of the protrusion 943 is set along the circumferential direction of the photosensitive drum 93, so that the guide member 94 has a more flexible position setting condition, and the guide member 94 can be flexibly adjusted according to the shapes and structures of different box bodies 91, so that the guide member 94 can be suitable for the box bodies 91 with different shapes and structures.
Referring to fig. 27, in the axial direction of the photosensitive drum 93, a first distance H1 between a first end surface of the protrusion 943 near the developing roller gear 921 and an outer end surface of the first end cap 913 is smaller than a second distance H2 between a second end surface of the developing roller gear 921 near the protrusion 943 and the outer end surface, and a third distance H3 between a third end surface of the transmission member 931 near the outer end surface and the outer end surface is greater than or equal to the second distance H2.
It should be noted that, in other embodiments, the guide 94 may be slidably mounted on the box 91 (such as the first end cap 913 or the developing frame 911), so that the protrusion 943 of the guide 94 may be slidably moved between the first position and the second position, and when the guide 94 is slidably mounted on the box 91, the box 91 is further provided with a reset mechanism 95 for forcing the protrusion 943 of the guide 94 to slidably reset from the second position to the first position.
In summary, by designing the process cartridge, the process cartridge is enabled to reduce the influence on the driving force of the driving head in the image forming apparatus and to extend the life of the driving head.
Seventh embodiment of the Process Cartridge
The difference between this embodiment and the sixth embodiment of the process cartridge is the structure of the lever, the structure of the first end cover, the connection manner of the return elasticity, and the like, and specifically, the difference will be described with reference to fig. 28, in this embodiment:
The setting of the second limiting part is canceled by the deflector rod 1061, and the deflector rod 1061 is concavely formed with a containing cavity 10611 from the second end to the first end; the first end cover 1062 is provided with a third limiting portion 10621 at the chute 10622, the third limiting portion 10621 extending toward the lever 1061 along the depth of the receiving cavity 10611; the return elastic member 1063 preferably still employs a compression spring, a first end of the compression spring is disposed in the accommodating cavity 10611 and abuts against the lever 1061, a second end of the compression spring is sleeved on the third limiting portion 10621 and abuts against the first end cover 1062, and the third return elastic member is disposed inside the first end cover 1062.
Eighth embodiment of Process Cartridge
The present embodiment differs from the first to seventh embodiments in the structure of the transmission member and the like, and specifically, the differences will be described with reference to fig. 29 to 33, in which: the transmission member 24 includes a mounting base 26, a drive force receiving head 27 and an elastic return member 28, preferably the elastic return member 28 is a torsion spring. The mounting seat 26 is arranged at the axial end of the photosensitive drum 22 and coaxially arranged with the photosensitive drum 220, a containing cavity 261 is formed in the mounting seat 26, the driving force receiving head 27 and the elastic resetting piece 28 are both arranged in the containing cavity 261, and the elastic restoring force of the elastic resetting piece 28 forces the driving force receiving head 27 to rotate relative to the mounting seat 26 so as to reset the driving force receiving head 27. The photosensitive drum gear 262 and the mounting seat 26 are arranged along the axial direction of the photosensitive drum 220 and are integrally formed, alternatively, the photosensitive drum gear 262 can be fixedly connected with the mounting seat 26.
The driving force receiving head 27 includes a first coupling portion 271, a support table 272, and a connection post 273 arranged in the axial direction, and a limit step 274 is formed at the junction of the support table 272 and the connection post 273. The first coupling portion 271 is disposed outside the accommodation cavity 261 and toward the recess portion 211, and the cross section of the first coupling portion 271 is substantially triangular and is twisted in a counterclockwise direction from an end near the recess portion 211 to an end far from the recess portion 211, and the twist direction of the second coupling portion 2102 of the driving head 210 is the same as the twist direction of the first coupling portion 271. After engaging with the second coupling portion 2102 of the driving head 210, as the driving head 210 rotates, a force toward the photosensitive drum 22 is applied to the first coupling portion 271, ensuring the stability of the connection of the first coupling portion 271 and the driving head 210. The connecting post 273 is provided with the locating part 275 far away from the one end of first coupling portion 271, locating part 275 detachably is fixed in the tip of connecting post 273, be provided with along the first spacing wall 263 of axial arrangement and second spacing wall 264 in the holding chamber 261 of mount pad 26, spacing step 274 constitutes axial spacing portion with locating part 275, spacing cooperation portion is constituteed to first spacing wall 263 and second spacing wall 264, spacing step 274 and first spacing wall 263 are spacing cooperation in the axial, locating part 275 and second spacing wall 264 are spacing cooperation in the axial, in order to realize driving force receiving head 27 is fixed in the axial of sensitization drum 220 relative to mount pad 26, in other embodiments, locating part 275 also can be jump ring etc..
The resilient return member 28 includes a resilient member body 281, a first torsion arm 282, and a second torsion arm 283. The elastic member main body 281 is sleeved outside the driving force receiving head 27, the driving force receiving head 27 further comprises a cylindrical force transmission arm 276, the force transmission arm 276 is detachably mounted on the connecting column 273, two ends of the force transmission arm 276 extend outwards in the radial direction from the peripheral wall of the connecting column 273, two circumferential limiting members 265 which are oppositely arranged in the radial direction of the mounting seat 26 are arranged on the inner peripheral wall of the accommodating cavity 261, and two ends of the force transmission arm 276 can be in limiting fit with the circumferential limiting members 265 in the circumferential direction of the photosensitive drum 220. The first torsion arm 282 is connected to the force transfer arm 276, and the second torsion arm 283 extends radially outwardly from the peripheral wall of the resilient member body 281 and is in circumferential positive engagement with the circumferential stop 265.
As can be seen from the above, when the process cartridge is mounted, the second coupling portion of the drive head in the image forming apparatus is engaged with the first coupling portion, and since the position where the drive head is stopped when the image forming apparatus is stopped is indefinitely, the engagement position of the first coupling portion and the second coupling portion is not a correct full engagement position, and at the same time, since the free end of the drive head can slightly swing in the radial direction, the axis of the drive head may be in an inclined state when no gear is engaged with the gear portion of the drive head in the radial direction for guiding. Then, after the image forming apparatus is operated, the driving belt drives the driving force receiving head to rotate relative to the mounting base and the photosensitive drum, and in the rotating process, the driving force receiving head applies an acting force to the elastic resetting piece, and simultaneously the first coupling part gradually rotates to a position completely clamped with the second coupling part of the driving head and is coupled with the second coupling part. Then, after the driving head continuously drives the driving force receiving head to rotate to the position where the transmission arm is abutted against the circumferential limiting piece, the driving head drives the mounting seat and the photosensitive drum to rotate, so that the transmission of driving force is realized. After the printing is finished, the first coupling part is separated from the driving head, and the driving force receiving head reversely rotates and resets under the action of the restoring force of the elastic resetting piece. Due to the buffer effect of the elastic reset piece, the driving force receiving head can be better clamped with the driving head completely, the torque born by the driving force receiving head is reduced, the stable connection between the driving head and the first coupling part is ensured, and the problem that the torque generated when the driving head drives the twisting protrusion to rotate in the prior art is increased instantaneously, so that the first coupling part is disconnected with the second coupling part of the driving head is avoided.
Ninth embodiment of processing cartridge
The present embodiment is different from the eighth embodiment in that the process cartridge in the present embodiment is not provided with the guide in the first to seventh embodiments of the process cartridge, the reset mechanism forcing the guide to reset, and the like.
Specifically, the difference will be described with reference to fig. 34, in this embodiment, the drive head 310 transmits the driving force only by the second coupling portion 3102 of the drive head 310 engaging with the first coupling portion 371 in the eighth embodiment of the process cartridge, and the peripheral gear 3101 of the drive head 310 is not engaged with any gear or guide during the loading and printing.
Tenth embodiment of Process Cartridge
The present embodiment is different from the ninth embodiment of the process cartridge in that, referring to fig. 35, in the present embodiment, the axial end of the developing roller 323 is provided with a developing roller gear 325, the developing roller gear 325 is located on a side of the first coupling portion 3271 near the recess portion 3211 in the axial direction of the photosensitive drum 322, at least a part of the developing roller gear 325 protrudes into the recess portion 3211 through the opening 3133 of the first end cap 3131 to engage with the gear portion of the drive head, and the developing roller gear 325 is located radially outside the first coupling portion 3271 and near the first coupling portion 3271 in the radial direction of the photosensitive drum 322.
Eleventh embodiment of Process Cartridge
Referring to fig. 36 to 38, in the present embodiment, the driving force receiving head 437 includes a first coupling portion 4371, a support base 4372, and a connecting post 4373 arranged in the axial direction, the number of the force transmitting arms 4376 is two, the two force transmitting arms 4376 are arranged opposite to each other in the radial direction of the driving force receiving head 437, the force transmitting arms 4376 are arranged on the support base 4372, the force transmitting arms 4376 extend in the axial direction of the driving force receiving head 437, one end of the force transmitting arms 4376 close to the first coupling portion 4371 is connected to the peripheral wall of the support base 4372, the two force transmitting arms 4376 each form a slot 4377 with the peripheral wall of the support base 4372, and the insertion port of the slot 4377 is located at the free end of the force transmitting arm 4376.
The accommodating cavity 4361 is internally provided with a supporting part 4362, a supporting convex ring 4363 and four elastic blocking arms 4364, the supporting part 4362 is positioned in the accommodating cavity 4361, the supporting convex ring 4363 extends towards one side of a concave part of the box body along the axial self-supporting part 4362 of the accommodating cavity 4361, the supporting convex ring 4363 is in axial insertion fit with the inserting groove 4377, the elastic blocking arms 4364 extend towards one side far away from the concave part along the axial self-supporting part 4362 of the accommodating cavity 4361, the four elastic blocking arms 4364 are arranged at intervals along the circumference of the accommodating cavity 4361, the free ends of the elastic blocking arms 4364 are provided with clamping hooks 4365 protruding towards the central shaft of the accommodating cavity 4361, the end part of the connecting column 4373 of the driving force receiving head 437 is provided with clamping grooves 4374, after the driving force receiving head 437 sequentially penetrates through the supporting convex ring 4363, the supporting part 4362 and the space surrounded by the four elastic blocking arms 4364 along the axial direction, the clamping grooves 4374 of the driving force receiving head 437 are clamped with the clamping hooks 65 of the free ends of the elastic blocking arms 4364, and the limiting of the driving force receiving head 437 relative to the axial direction of the driving force receiving head 437 is realized.
The elastic member main body 4381 is sleeved outside the supporting collar 4363, the first torsion arm 4382 is abutted against the force transmission arm 4376 of the driving force receiving head 437 and is in limit fit with the force transmission arm 4376 in the circumferential direction of the mounting seat 436, and the second torsion arm 4383 is abutted against the protrusion 43621 on the supporting portion 4362 of the mounting seat 436 and is in limit fit with the protrusion 43621 in the circumferential direction of the mounting seat 436.
In addition, the gear trains formed by the photosensitive drum gear, the developing roller gear, the stirring rack gear and the like can be positioned on one side of the box body far away from the transmission part, and at the moment, the photosensitive drum gear and the mounting seat are two independent parts. And the first limiting wall and/or the second limiting wall can be replaced by a limiting cover which is detachably and fixedly connected with the mounting seat. The number of circumferential stoppers may be one. The transmission arm can also be integrally formed with the connecting column. Only one end of the transmission arm extends outwards from the peripheral wall of the transmission arm and is in limit fit with the circumferential limiting piece in the circumferential direction. The elastic resetting piece can be positioned in the accommodating cavity of the mounting seat or outside the accommodating cavity. The above-described modifications can also achieve the object of the present utility model.
Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the utility model, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the utility model, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the utility model.

Claims (12)

1. The processing box comprises a box body, a photosensitive drum and a developing roller, wherein the photosensitive drum and the developing roller are rotatably supported between two end walls of the box body, a transmission part is arranged at the axial end of the photosensitive drum, a concave part is arranged at a position close to the transmission part of the processing box, and the concave part is concave from the end wall of the first end of the box body towards the second end of the box body;
the method is characterized in that:
the transmission piece comprises a mounting seat, a driving force receiving head and an elastic resetting piece;
the mounting seat is arranged at the axial end of the photosensitive drum and coaxially arranged with the photosensitive drum, a containing cavity is formed in the mounting seat, the driving force receiving head is arranged in the containing cavity, and the elastic restoring force of the elastic restoring piece forces the driving force receiving head to rotate relative to the mounting seat so as to restore the driving force receiving head;
one end of the driving force receiving head is provided with a first coupling part, the first coupling part is positioned outside the accommodating cavity and faces the concave part, the driving force receiving head is also provided with an axial limiting part, the mounting seat is also provided with a limiting matching part, and the axial limiting part is in limiting matching with the limiting matching part so that the driving force receiving head is fixed relative to the mounting seat in the axial direction of the photosensitive drum;
The driving force receiving head further comprises a force transmission arm, a circumferential limiting part is arranged on the inner circumferential wall of the accommodating cavity, and the force transmission arm can be in circumferential limiting fit with the circumferential limiting part in the circumferential direction of the photosensitive drum.
2. A process cartridge according to claim 1, wherein:
the axial end of the developing roller is provided with a developing roller gear, the axial end of the photosensitive drum is provided with a photosensitive drum gear, and the developing roller gear is in transmission connection with the photosensitive drum gear.
3. A process cartridge according to claim 2, wherein:
the developing roller gear and the photosensitive drum gear are arranged on one side of the box body, which is close to the transmission part;
the photosensitive drum gear is fixedly connected with the mounting seat; or alternatively
The photosensitive drum gear and the mounting seat are integrally formed.
4. A process cartridge according to claim 2, wherein:
the developing roller gear and the photosensitive drum gear are arranged on one side of the box body, which is far away from the transmission part.
5. A process cartridge according to claim 1, wherein:
the axial end of the developing roller is provided with a developing roller gear, the developing roller gear is positioned on one side, close to the concave part, of the first coupling part in the axial direction of the photosensitive drum, at least one part of the developing roller gear stretches into the concave part, and the developing roller gear is positioned on the radial outer side of the first coupling part and close to the first coupling part in the radial direction of the photosensitive drum.
6. A process cartridge according to any one of claims 1 to 5, wherein:
the elastic reset piece comprises an elastic piece main body, a first torsion arm and a second torsion arm;
the elastic piece main body is sleeved outside the driving force receiving head, the first torsion arm is in limiting fit with the driving force receiving head in the circumferential direction of the mounting seat, and the second torsion arm is in limiting fit with the mounting seat in the circumferential direction of the mounting seat.
7. A process cartridge according to claim 6, wherein:
the first torsion arm is connected to the force transmission arm, and the second torsion arm extends outwards from the peripheral wall of the elastic piece main body along the radial direction and is in limit fit with the circumferential limiting piece in the circumferential direction.
8. A process cartridge according to any one of claims 1 to 5, wherein:
the driving force receiving head includes the first coupling portion, a support table, and a connection post arranged in an axial direction;
the force transmission arm is arranged on the connecting column, and at least one end of the force transmission arm extends outwards along the radial direction from the peripheral wall of the connecting column; or alternatively
The force transmission arm is arranged on the supporting table, is connected to the peripheral wall of the supporting table and extends along the axial direction of the driving force receiving head.
9. A process cartridge according to any one of claims 1 to 5, wherein:
the cross section of the first coupling part is triangular and is twisted along the anticlockwise direction from one end close to the concave part to one end far away from the concave part.
10. A process cartridge according to any one of claims 1 to 5, wherein:
the process cartridge further includes a guide member mounted on the shaft core of the developing roller or on the cartridge body, the guide member being located on a side of the transmission member away from the photosensitive drum in an axial direction of the photosensitive drum, the guide member having a projection;
the protrusion has a first position and a second position, when the protrusion is positioned at the first position, the protrusion can be in fit connection with a peripheral gear of a driving head in the imaging device, the protrusion can be driven from the first position to the second position by the peripheral gear, and when the protrusion is positioned at the second position, the protrusion is released from fit connection with the peripheral gear.
11. A process cartridge according to claim 10, wherein:
the process cartridge further includes a return mechanism coupled between the cartridge body and the guide, the return mechanism for forcing the projection from the second position to the first position.
12. Imaging device, imaging device includes the host computer, be provided with the cartridge in the host computer, be provided with the drive head on the lateral wall of cartridge, the drive head includes gear portion and second coupling portion, gear portion is located on the perisporium of drive head, the second coupling portion is located the axial end of drive head, its characterized in that, detachably installs the processing box according to any one of claims 1 to 11 in the cartridge, the drive head stretches into the depressed part, first coupling portion with the second coupling portion joint.
CN202320750837.2U 2023-04-06 2023-04-06 Process cartridge and image forming apparatus Active CN220105520U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320750837.2U CN220105520U (en) 2023-04-06 2023-04-06 Process cartridge and image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320750837.2U CN220105520U (en) 2023-04-06 2023-04-06 Process cartridge and image forming apparatus

Publications (1)

Publication Number Publication Date
CN220105520U true CN220105520U (en) 2023-11-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320750837.2U Active CN220105520U (en) 2023-04-06 2023-04-06 Process cartridge and image forming apparatus

Country Status (1)

Country Link
CN (1) CN220105520U (en)

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