CN116610019A - Process cartridge and image forming apparatus - Google Patents

Abstract

The invention provides a processing box and imaging equipment, the processing box includes developing frame, drum frame, developing roller photosensitive drum and driving mechanism, there are stress projections on the developing frame, the movable hook can apply the acting force to the stress projection, in order to force the developing frame to rotate relative to drum frame, the developing frame drives the developing roller to keep away from photosensitive drum; the stress bulge is positioned on a separating piece of the developing frame, the separating piece is in sliding connection with the developing frame in a first direction, and the first direction is perpendicular to the axial direction of the developing roller and an included angle between the first direction and the vertical direction is smaller than 90 degrees; along with the movement of the processing box along the horizontal direction, the stress protrusion moves to the matching position from the initial position relative to the processing box, the driving mechanism drives the stress protrusion to gradually move downwards from the retracted position to the extended position, or the driving mechanism drives the stress protrusion to change from the active state to the fixed state. The processing box can avoid interference with the movable hook in the imaging equipment to cause plastic deformation of the spring under the movable hook, thereby influencing the printing quality.

Description

Process cartridge and image forming apparatus

Technical Field

The present invention relates to the field of electrophotographic image forming, and more particularly, to a process cartridge and an image forming apparatus.

Background

An electrophotographic image forming apparatus generally has an image processing unit and a developing unit therein, and develops an electrostatic latent image formed on the image processing unit with a developer such as carbon powder supplied from the developing unit to form a visible image on a medium such as paper. The toner is generally supplied to the developing unit by a process cartridge or the like having a function of accommodating a certain amount of toner, which is detachably mounted to the developing unit in the electrophotographic image forming apparatus.

There is a process cartridge in which, when the image forming apparatus does not perform a printing job in a state of being mounted to the image forming apparatus, a separating device of the image forming apparatus abuts on a separating member on the process cartridge and separates a developing roller and a photosensitive drum of the process cartridge. The cleaning scraper cleans the surface of the rotating photosensitive drum, so that the quality problem caused by residual carbon powder on the surface of the photosensitive drum in the printing process is avoided.

A cartridge transport mechanism is provided in the image forming apparatus, and the cartridge transport mechanism can transport a process cartridge mounted in a tray to a print work position of the process cartridge. When the process cartridge is transported to the printing work position, the force-receiving projections protruding outward of the process cartridge press the moving hooks of the image forming apparatus downward. The spring below the movable hook can generate plastic deformation with different degrees after being compressed for many times, so that the length of the movable hook cannot be restored to the original set length, the movable hook cannot extend to the original set height to be clamped with the stressed bulge of the processing box, and therefore separation of the developing roller and the photosensitive drum and cleaning of the photosensitive drum cannot be realized, and printing quality is affected. In addition, due to the limitation of the space of the lower surface of the process cartridge and the lower surface of the cartridge bin of the image forming apparatus, the amount of protrusion of the separating member from the lower surface of the powder cartridge is small, the amount of hooking of the separating member and the moving hook is small, and after plastic deformation of the spring, the moving hook moves down, the amount of hooking is smaller, so that the situation that the moving hook cannot catch the stress protrusion is likely to occur, and further the photosensitive drum cannot be cleaned, and the printing quality is affected.

Disclosure of Invention

A first object of the present invention is to provide a process cartridge that ensures smoothness of a process cartridge machine, and prevents a spring under a moving hook from being plastically deformed by interference with the moving hook in an image forming apparatus, affecting print quality.

A second object of the present invention is to provide an image forming apparatus having the above-described process cartridge.

In order to achieve the above-described first object, the present invention provides a process cartridge detachably mountable in an image forming apparatus provided with a moving hook therein; the process cartridge includes a developing frame, a drum frame, a developing roller rotatably supported on the developing frame, and a photosensitive drum rotatably supported on the drum frame; the developing frame is provided with a stress bulge, and the movable hook can apply acting force to the stress bulge so as to force the developing frame to rotate relative to the drum frame, and the developing frame drives the developing roller to be far away from the photosensitive drum; the developing frame is provided with a separating piece, the stress bulge is positioned on the separating piece, the separating piece is in sliding connection with the developing frame in a first direction, and the first direction is perpendicular to the axial direction of the developing roller and an included angle between the first direction and the vertical direction is smaller than 90 degrees; the process cartridge further includes a driving mechanism that drives the force-receiving projection to gradually move downward from the retracted position to the extended position or drives the force-receiving projection to change from the active state to the fixed state with respect to the process cartridge as the process cartridge moves in the horizontal direction.

According to the scheme, in the process of moving the processing box relative to the movable hook, the force-bearing protrusion is driven by the driving mechanism to gradually move downwards from the retracted position to the extended position or the force-bearing protrusion is driven by the driving mechanism to change from the active state to the fixed state, so that before the force-bearing protrusion passes over the movable hook, the force-bearing protrusion can avoid the movable hook, and therefore the force-bearing protrusion is not excessively compressed, even the force-bearing protrusion can not contact with the movable hook in the moving process of the force-bearing protrusion, the force-bearing protrusion can be prevented from repeatedly pressing the movable hook, the spring at the bottom of the movable hook generates certain plastic deformation, the free length of the spring cannot be recovered, and the problem that the force-bearing protrusion of the separating piece is not hooked or the service life of the imaging equipment is shortened occurs.

In a preferred embodiment, the driving mechanism includes a coil and a magnet, the coil and the magnet repel each other after being energized, one of the coil and the magnet being located on the separating member, and the other of the coil and the magnet being located on the developing frame; the coil is powered off, the stress protrusion is in an active state, and the stress protrusion can move along a first direction; after the coil is energized, the separator is held in a fixed state by repulsive force.

It follows that the coil is de-energized before the force-bearing projection passes over the moving hook, and the force-bearing projection is in an active state and therefore retracts upward when passing over the moving hook, thereby avoiding interference with and exerting pressure on the moving hook.

Further, a switch is provided on an end wall of the drum frame, and the imaging device is provided with a trigger part, and after the trigger part triggers the switch, the coil is electrified.

Therefore, by arranging the switch on the end wall of the drum frame, after the trigger part triggers the switch, the coil is electrified again, so that the coil is in an outage state before the stressed protrusion passes over the movable hook.

The further scheme is that the processing box further comprises a delay mechanism, a switch is arranged on the end wall of the drum frame, a trigger part is arranged on the imaging device, and after the trigger part triggers the switch, the delay mechanism is started and the coil is electrified after the preset time.

Therefore, the delay mechanism can be arranged, and after the switch is triggered, the coil is electrified again after a preset time, so that the flexibility of the position setting of the switch is higher.

The development frame is provided with a driving head at one end close to the stress bulge, and the driving head drives the photosensitive drum and/or the development roller to rotate; the switch is arranged close to the driving head, a transmission head is arranged in the imaging equipment, the transmission head can move in an axial telescopic way, and the triggering part is positioned on the transmission head.

It can be seen that by providing the trigger on the drive head, the drive head triggers the switch during extension into engagement with the drive head of the process cartridge.

In a preferred scheme, the separating piece is provided with a sliding groove extending along a first direction, the developing frame is provided with a guide post and a supporting protrusion, the sliding groove is in plug fit with the guide post along the axial direction of the developing roller, the guide post is in sliding fit with the sliding groove, and the supporting protrusion is positioned above the guide post; one of the coil and the magnet is arranged on the side wall of the separating piece facing the supporting protrusion, the other of the coil and the magnet is arranged on the supporting protrusion, and the coil and the magnet are oppositely arranged in the first direction; and/or the number of the sliding grooves is more than two, and the sliding grooves are arranged in parallel.

Therefore, the arrangement of the sliding grooves can guide the separating piece and prevent the separating piece from rotating.

The driving mechanism comprises a guide rail, the guide rail is provided with a guide inclined plane, the separating piece is in sliding fit with the guide inclined plane, and the guide inclined plane is obliquely arranged from the initial position to the matched position from top to bottom; the process cartridge further includes a stopper detachably mounted on the developing frame, the stopper being capable of restricting the force-receiving projection from sliding along the guide slope toward the fitting position to hold the force-receiving projection at the initial position.

Therefore, the blocking piece can block the separating piece, so that the separating piece is kept at the initial position, and after the blocking piece is removed, the separating piece slides down to the matching position along the guide inclined plane under the action of self gravity.

The further scheme is that the limiting groove is formed in the bottom end of the guide inclined surface, the separating piece is provided with the clamping portion, and the clamping portion can be in limiting fit with the limiting groove.

Therefore, the limiting groove can limit the clamping part of the separating piece, so that the separating piece is kept at the matching position.

The separating piece is provided with a stress part, the developing frame is provided with a guide groove, the guide groove is parallel to the guide inclined plane, and the stress part stretches into the guide groove and is in sliding fit with the guide groove; the guide groove is internally provided with a gravity ball which is positioned on the upstream side of the stress part along the sliding direction of the stress part.

Therefore, the gravity ball is arranged to push the separating piece, so that the influence of the gravity component of the separating piece on the sliding process can be avoided when the separating piece slides down along the guide inclined plane.

In order to achieve the second object described above, the present invention provides an image forming apparatus including the above-described process cartridge.

Drawings

Fig. 1 is a block diagram of a pressing and separating mechanism in a first embodiment of a process cartridge and an image forming apparatus of the present invention.

Fig. 2 is a structural view of the driving end in the first embodiment of the process cartridge of the present invention.

Fig. 3 is a block diagram of a first embodiment of the process cartridge of the present invention after hiding the end cap.

Fig. 4 is a schematic view showing the first embodiment of the process cartridge of the present invention in which the separating member is moved from the initial position to the engaged position.

Fig. 5 is a schematic view showing a process cartridge according to a second embodiment of the present invention in which a separating member is moved from an initial position to a fitting position.

Fig. 6 is a schematic view showing a third embodiment of the process cartridge according to the present invention in which the separating member is moved from the initial position to the engaged position.

The invention is further described below with reference to the drawings and examples.

Detailed Description

Process cartridge and image forming apparatus of first embodiment

Referring to fig. 1 to 3, the image forming apparatus of the present embodiment includes a cartridge housing in which a first transmission head (not shown), a second transmission head (not shown), a driving mechanism (not shown), a powder cartridge transporting mechanism, a tray 105, and a push separation mechanism 10 are provided, and a process cartridge detachably mounted in the cartridge housing, the driving mechanism driving the first transmission head and the second transmission head to rotate simultaneously. The processing box is installed in the tray 105, the powder box conveying mechanism can drive the tray 105 and drive the processing box to move to a printing working position, the pushing and separating mechanism 10 is located below the tray 105, the pushing and separating mechanism 10 comprises a moving seat 101, a moving hook 102 and a spring 103, the moving hook 102 is connected with the moving seat 101 in a sliding mode and can move in the vertical direction relative to the moving seat 101, a concave portion 104 is formed in the moving seat 101, the moving hook 102 extends upwards from the concave portion 104, the spring 103 is connected to the bottom end of the moving hook 102, and the moving hook 102 can be forced to move upwards to an extending position. In addition, the moving seat 101 can move in the horizontal direction and drive the moving hook 102 to move.

The process cartridge includes a developing unit 2 and a drum unit 3, the developing unit 2 includes a developing frame 21, a developing roller 22 rotatably supported on the developing frame 21, and a stirring frame (not shown), and a bottom of one end of the developing frame 21 is provided with a force receiving projection 6. The drum unit 3 includes a drum frame 31, a photosensitive drum 4 rotatably supported on the drum frame 31, and a cleaning blade (not shown) mounted on the drum frame 31, both ends of the cleaning blade being supported on the drum frame 31, and a blade of the cleaning blade being abutted on the photosensitive drum 4 for cleaning residual toner on the photosensitive drum 4, a top of one end of the drum frame 31 remote from the force-receiving projection 6 being provided with an elastic member such as a spring (not shown) and the like, a first end of the spring being abutted on the drum frame 31, a second end of the spring being abutted on the developing frame 21, a position where the developing frame 21 is hinged to the drum frame 31 being located between the force-receiving projection 6 and the spring in a height direction of the process cartridge, the developing frame 21 being rotated relative to the drum frame 31 after a force is applied to the force-receiving projection 6 by a moving hook 102 of the pressing separation mechanism 10 in the image forming apparatus, the developing roller 22 being separated from the photosensitive drum 4, the developing roller 22 being moved to a cleaning position relative to the photosensitive drum 4, at which time the spring force is in a compressed state. The moving seat 101 drives the moving hook 102 to move reversely, after the acting force on the stress protrusion 6 is removed, the spring pushes the developing frame 21 to rotate under the action of the elastic restoring force of the spring, the developing roller 22 is contacted with the photosensitive drum 4, and the developing roller 22 moves to an imaging position relative to the photosensitive drum 4.

One axial end of the photosensitive drum 4 is provided with a first driving assembly 42, the first driving assembly 42 comprises a first driving head 422, the first driving head 422 and the photosensitive drum 4 are coaxially arranged, and the cross section of the first driving head 422 is triangular with a round hole in the center. The first drive assembly 42 is coupled to the first drive head and receives a first drive force transmitted by the first drive head.

One axial end of the stirring frame is provided with a second driving component 5, the first driving component 42 and the second driving component 5 are positioned on the same side of the processing box, and the second driving component 5 is connected with the second transmission head and receives a second driving force transmitted by the second transmission head. The developing frame 21 includes a mounting plate 25 disposed near one end of the second driving assembly 5, a supporting hole 251 is formed in the mounting plate 25, and the second driving assembly 5 is mounted at the supporting hole 251.

The developing roller gear 222 is sleeved on one axial end of the developing roller 22, the developing roller gear 222 can drive the developing roller 22 to rotate, the second driving assembly 5 comprises a transmission gear 51 and a second driving head 52 which are integrally formed, the cross section of the second driving head 52 is triangular, a round hole is formed in the center of the second driving head 52, the transmission gear 51 and the second driving head 52 are coaxially arranged, the axis of the second driving assembly 5 is parallel to the axis of the developing roller 22, and the transmission gear 51 is meshed with the developing roller gear 222.

The developing frame 21 is provided with a separating member 7, the stress protrusion 6 is located on the separating member 7, the separating member 7 is slidably connected with the developing frame 21 in a first direction Z, and an included angle between the first direction Z and an axial direction of the developing roller 22 and a vertical direction is smaller than 90 degrees, in this embodiment, the first direction Z is parallel to the vertical direction, that is, an included angle between the first direction Z and the vertical direction is 0 degrees. Specifically, the separating member 7 is provided with two slide grooves 71 each extending in the first direction Z, the developing frame 21 is provided with a guide post 211 and a supporting projection 212, the slide grooves 71 are in plug-in fit with the guide post 211 in the axial direction of the developing roller 22, the guide post 211 is in sliding fit with the slide grooves 71 in the first direction Z, and the supporting projection 212 is located above the guide post 211.

The process cartridge further includes a driving mechanism 8, and the force-receiving projections 6 are moved from an initial position to a fitting position with respect to the process cartridge in association with the movement of the process cartridge in the horizontal direction, the driving mechanism 8 driving the force-receiving projections 6 to change from the active state to the fixed state.

The driving mechanism 8 includes a coil 81 and a magnet 82, the coil 81 is energized to repel the magnet 82, the magnet 82 is located on a side wall of the separator 7 facing the supporting boss 212, the coil 81 is located on the supporting boss 212, and the coil 81 and the magnet 82 are disposed opposite to each other in the first direction Z. The coil 81 is powered off, the stress protrusion 6 is in an active state, and the stress protrusion 6 can move along the first direction Z; after the coil 81 is energized, the separator 7 is held in a fixed state by repulsive force. Before the force-receiving projection 6 passes over the moving hook 102, the coil 81 is deenergized, and the force-receiving projection 6 is in an active state, so that the force-receiving projection 6 is retracted upward while passing over the moving hook 102, thereby avoiding interference with the moving hook 102 and applying pressure to the moving hook 102. The end wall of the drum frame 31 is further provided with a switch 311, and an triggering portion (not shown) is provided in the image forming apparatus, and after the triggering portion triggers the switch 311, the coil 81 is energized.

In combination with fig. 1 and 4, after the process cartridge loading machine, the powder cartridge transporting mechanism drives the tray 105 and the process cartridge to move rightward along the horizontal direction X to the printing working position of the process cartridge, before the trigger part triggers the switch 311 in the process of moving the process cartridge, the coil 81 is in the power-off state, the force-receiving protrusion 6 is in the active state and can move along the first direction Z, before the force-receiving protrusion 6 passes over the moving hook 102, the force-receiving protrusion 6 is always in the active state, when the process cartridge moves to the position interfering with the moving hook 102, the force-receiving protrusion 6 moves along the first direction Z in the direction away from the moving hook 102, so as to avoid the moving hook 102, no interference with the moving hook 102 is generated, pressure is applied to the moving hook 102, after the force-receiving protrusion 6 passes over the moving hook 102, the trigger part triggers the switch 311, the coil 81 is in the power-off state, the coil 81 is mutually repelled with the magnet 82, because the magnet 82 is fixed on the separating member 7 moves along the direction of the first direction Z toward the moving hook 102 until the top end of the guide post 211 abuts against the chute 71 under the repulsive force, and the separating member 7 is kept in the extended position. At this time, the moving hook 102 is located at a position between the photosensitive drum 4 and the force receiving projection 6.

The working method of the processing box comprises an imaging step and a cleaning step, wherein the imaging step and the cleaning step are alternately carried out in the working process of the processing box.

The imaging step comprises the following steps: the driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously, at this time, the developing roller 22 is in contact with the photosensitive drum 4, the first transmission head drives the first driving component 42 to rotate so as to drive the photosensitive drum 4 to rotate, the second transmission head drives the second driving component 5 to rotate so as to drive the developing roller 22 and the stirring frame to rotate, the stirring frame is used for stirring carbon powder in a powder bin of the developing unit 2, and the developing roller 22 is matched with the photosensitive drum 4 to perform imaging work.

The cleaning step comprises the following steps: the driving mechanism drives the first driving head and the second driving head to rotate simultaneously, at this time, the moving seat 101 in the imaging device drives the moving hook 102 to move rightwards along the horizontal direction and apply acting force to the stress protrusion 6, the developing frame 21 rotates relative to the drum frame 31, the developing roller 22 is separated from the photosensitive drum 4, the first driving head drives the first driving component 42 to rotate, thereby driving the photosensitive drum 4 to rotate, the second driving head drives the second driving component 5 to rotate, thereby driving the developing roller 22 and the stirring frame to rotate, and the cleaning scraper cleans residual powder on the surface of the photosensitive drum 4. The rotation speed of the developing roller 22 in the image forming step is greater than that of the developing roller 22 in the cleaning step, while the rotation speed of the photosensitive drum 4 in the image forming step is greater than that of the photosensitive drum 4 in the cleaning step. The rotation speed of the developing roller 22 in the cleaning step is small, and it can be ensured that the developing roller 22 does not convey the toner outwards when the photosensitive drum 4 is cleaned.

In other embodiments, the second driving assembly 5 is connected to the developing roller 22 through a clutch, and in the cleaning position, the first transmission head drives the photosensitive drum 4 to rotate, and the second driving assembly 5 is separated from the developing roller 22, so that the second transmission head is separated from the developing roller 22, and the developing roller 22 stops rotating.

Process cartridge and image forming apparatus of second embodiment

As a description of a second embodiment of the process cartridge and the image forming apparatus of the present invention, only differences from the first embodiment of the process cartridge and the image forming apparatus described above will be described below.

Referring to fig. 5, the driving mechanism 28 in the present embodiment can drive the force-receiving protrusion 26 to gradually move downward from the retracted position to the extended position, the driving mechanism 28 includes a guide rail 281, the guide rail 281 is provided with a guiding inclined surface 282, the separating member 27 is slidingly engaged with the guiding inclined surface 282, and the guiding inclined surface 282 is inclined from top to bottom from the initial position 201 to the engaged position 202.

The process cartridge further includes a stopper 29, the stopper 29 being detachably mounted on the developing frame, the stopper 29 being capable of restricting the force-receiving projection 26 from sliding along the guide slope 282 toward the fitting position 202 to hold the force-receiving projection 26 at the initial position 201. The bottom of direction inclined plane 282 has seted up spacing groove 283, and separator 27 is provided with block portion 271, and block portion 271 can with spacing groove 283 spacing cooperation, and the bottom surface of block portion 271 is provided with block inclined plane 272, and block inclined plane 272 is parallel to direction inclined plane 282 setting and with direction inclined plane 282 sliding fit.

The blocking member 29 can block the separating member 27 so that the separating member 27 is maintained at the initial position 201, and when the blocking member 29 is removed, the separating member 27 slides down to the position of the engaging position 202 at the position of the limiting groove 283 along the guide inclined surface 282 by the self-gravity, and at this time, the engaging portion 271 of the separating member 27 is engaged with the limiting groove 283, and the moving hook 102 is located between the initial position 201 and the engaging position 202. The positioning groove 283 is provided to position the engaging portion 271 of the separator 27 so that the separator 27 is held at the engaging position 202.

When the process cartridge is taken out, the separating member 27 is manually moved to the initial position 201 and then mounted back to the blocking member 29, so that the process cartridge is returned to the initial state for reinstallation. Among them, the stopper 29 is preferably a shutter that can be inserted into the process cartridge in the vertical direction to block the sliding of the separating member 27.

Process cartridge and image forming apparatus of third embodiment

As a description of a third embodiment of the process cartridge and the image forming apparatus of the present invention, only differences from the above-described second embodiment of the process cartridge and the image forming apparatus will be described below.

Referring to fig. 6, in the present embodiment, the separating member 37 is provided with a force receiving portion 371, a guide groove 370 is provided on the developing frame, the guide groove 370 is parallel to the guide inclined surface 382, the force receiving portion 371 extends into the guide groove 370 and is slidably fitted with the guide groove 370, a gravity ball 30 is provided in the guide groove 370, and the gravity ball 30 is located on the upstream side of the force receiving portion 371 in the sliding direction of the force receiving portion 371 in the guide groove 370.

By providing the gravity ball 30 to push the separator 37, it is possible to avoid the separator 37 from sliding down along the guide slope 382 due to the influence of too small a gravity component of the separator 37 itself on sliding.

From the above, in the process that the processing box moves relative to the movable hook, the driving mechanism drives the stress protrusion to gradually move downwards from the retracted position to the extended position or drives the stress protrusion to change from the active state to the fixed state, so that before the stress protrusion passes over the movable hook, the stress protrusion can avoid the movable hook, and therefore the problem that the spring under the movable hook is excessively compressed and even cannot be contacted with the movable hook in the process that the stress protrusion moves can be avoided, the stress protrusion can be prevented from repeatedly pressing the movable hook, the spring at the bottom of the movable hook generates certain plastic deformation, the free length of the spring cannot be recovered, and the problem that the stress protrusion of the separating piece is not hooked or the service life of the imaging equipment is shortened occurs. In addition, in the cleaning step, after the developing roller and the photosensitive drum are separated, the first driving component still drives the photosensitive drum to rotate, meanwhile, the second driving component still drives the developing roller to rotate, after the cleaning scraper of the drum unit cleans the photosensitive drum, the developing roller moves to an imaging position, namely, the developing roller is contacted with the photosensitive drum, and the driving mechanism of the imaging device drives the first driving component and the second driving component to rotate, so that the developing roller and the photosensitive drum are driven to rotate simultaneously, and the switching process of the cleaning step and the imaging step is simpler and more convenient, and the situation that the connection between the second driving component and the developing roller fails is avoided, so that the driving cannot be transmitted to the rotating mechanism such as the developing roller. And the processing box simplifies the structure of the second driving component, so that the connection structure of the developing roller and the second transmission head is simpler, and the production cost can be greatly reduced. In addition, if the second transmission head is disengaged from the developing roller in the cleaning position, the developing roller stops rotating, and the abrasion of the rubber layer on the developing roller caused by friction between the developing roller and the carbon powder due to the fact that the developing roller always rotates can be avoided. The imaging step and the cleaning step are alternately performed, so that the printing quality can be improved, and when the imaging step and the cleaning step are alternately performed, the developing roller and the second transmission head are always in a connection state.

In addition, the processing box further comprises a delay mechanism, and after the trigger part triggers the switch, the delay mechanism is started and the coil is electrified after the preset time. The switch also can be close to first drive head or second drive head setting, is provided with first transmission head and second transmission head in the imaging device, and first transmission head and second transmission head all can follow axial flexible removal, and trigger part is located first transmission head or second transmission head, realizes the triggering to the switch through the flexible of corresponding transmission head. The coil may be provided on the separating member, and the magnet may be provided on the developing frame. The number and shape of the guide posts and runners can be varied as desired. The number of the driving mechanisms in the imaging device may be two, and the two driving mechanisms respectively drive the first transmission head and the second transmission head to rotate. The time delay mechanism can also be realized by adopting other structures, such as a force storage torsion spring and a ratchet mechanism are arranged to cooperate to delay the outward extending action of the separating piece, so as to avoid the separating piece from pressing down the movable hook in the installation process. The above-described modifications can also achieve the object of the present invention.

Finally, it should be emphasized that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, but rather that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the invention, and any modifications, equivalent substitutions, improvements, etc. are intended to be included within the scope of the present invention.

Claims (10)

1. A process cartridge detachably mounted in an image forming apparatus provided with a moving hook therein;

the process cartridge includes a developing frame, a drum frame, a developing roller rotatably supported on the developing frame, and a photosensitive drum rotatably supported on the drum frame;

the developing frame is provided with a stress bulge, the movable hook can apply an acting force to the stress bulge so as to force the developing frame to rotate relative to the drum frame, and the developing frame drives the developing roller to be far away from the photosensitive drum;

the method is characterized in that:

the developing frame is provided with a separating piece, the stress protrusion is positioned on the separating piece, the separating piece is in sliding connection with the developing frame in a first direction, and the first direction is perpendicular to the axial direction of the developing roller and an included angle between the first direction and the vertical direction is smaller than 90 degrees;

the processing box further comprises a driving mechanism, the stress protrusion moves to the matching position from the initial position relative to the processing box along with the movement of the processing box along the horizontal direction, and the driving mechanism drives the stress protrusion to gradually move downwards from the retracted position to the extended position or drives the stress protrusion to change from the active state to the fixed state.

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

the driving mechanism comprises a coil and a magnet, the coil and the magnet repel each other after being electrified, one of the coil and the magnet is positioned on the separating piece, and the other of the coil and the magnet is positioned on the developing frame;

the coil is powered off, the stress protrusion is in the active state, and the stress protrusion can move along the first direction;

after the coil is energized, the separating element is maintained in the fixed state by repulsive force.

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

the end wall of the drum frame is provided with a switch, the imaging device is provided with a trigger part, and after the trigger part triggers the switch, the coil is electrified.

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

the process cartridge further includes a delay mechanism, a switch is provided at an end wall of the drum frame, the image forming apparatus is provided with a trigger portion, and after the trigger portion triggers the switch, the delay mechanism is turned on and the coil is energized after a preset time.

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

a driving head is arranged at one end of the developing frame, which is close to the stress bulge, and the driving head drives the photosensitive drum and/or the developing roller to rotate;

the switch is close to the driving head, a transmission head is arranged in the imaging device, the transmission head can move in an axial telescopic mode, and the triggering part is located on the transmission head.

6. A process cartridge according to any one of claims 2 to 4, wherein:

the separating piece is provided with a sliding groove extending along the first direction, the developing frame is provided with a guide post and a supporting protrusion, the sliding groove is in plug-in fit with the guide post along the axial direction of the developing roller, the guide post is in sliding fit with the sliding groove, and the supporting protrusion is positioned above the guide post;

one of the coil and the magnet is provided on a side wall of the separating member facing the supporting projection, the other of the coil and the magnet is provided on the supporting projection, the coil and the magnet being oppositely provided in the first direction;

and/or the number of the sliding grooves is more than two, and a plurality of the sliding grooves are arranged in parallel.

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

the driving mechanism comprises a guide rail, the guide rail is provided with a guide inclined plane, the separating piece is in sliding fit with the guide inclined plane, and the guide inclined plane is obliquely arranged from top to bottom from the initial position to the matched position;

the process cartridge further includes a stopper detachably mounted on the developing frame, the stopper being capable of restricting the force-receiving projection from sliding along the guide slope toward the fitting position so as to hold the force-receiving projection at the initial position.

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

the bottom of direction inclined plane has seted up the spacing groove, the separator is provided with the block portion, the block portion can with spacing groove spacing cooperation.

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

the separating piece is provided with a force-bearing part, the developing frame is provided with a guide groove, the guide groove is parallel to the guide inclined plane, and the force-bearing part stretches into the guide groove and is in sliding fit with the guide groove;

the guide groove is internally provided with a gravity ball, the gravity ball is positioned on the upstream side of the stress part along the sliding direction of the stress part in the guide groove.

10. An image forming apparatus comprising the process cartridge according to any one of claims 1 to 9.