Process cartridge and image forming apparatus

Abstract

The application provides a processing box and an imaging device, the processing box comprising a developing frame, a drum frame, a developing roller photosensitive drum and a driving mechanism, the developing frame is provided with a stress convex, a moving hook can apply a force to the stress convex to force the developing frame to rotate relative to the drum frame, and the developing frame drives the developing roller to move away from the photosensitive drum; the stress convex is located on a separation piece of the developing frame, the separation piece is slidingly connected with the developing frame in a first direction, the first direction is perpendicular to the axial direction of the developing roller and the included angle between the first direction and the vertical direction is less than 90 degrees; the stress convex moves from an initial position to a matching position relative to the processing box along with the movement of the processing box in the horizontal direction, the driving mechanism drives the stress convex to gradually move downward from a retracted position to an extended position or the driving mechanism drives the stress convex to change from a movable state to a fixed state. The processing box can avoid the interference with the moving hook in the imaging device to cause the plastic deformation of the spring under the moving hook and affect the printing quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrophotographic imaging, and in particular, to a process cartridge and an image forming apparatus. BACKGROUND

[0002] An image forming apparatus generally has an image processing unit and a developing unit, and a visible image is formed on a medium such as paper by developing an electrostatic latent image formed on the image processing unit with a developer such as toner provided by the developing unit. A process cartridge or the like having a toner container that accommodates a certain amount of toner is detachably mounted to the developing unit of the image forming apparatus to supply toner to the developing unit.

[0003] A process cartridge of the prior art is configured such that, when the process cartridge is mounted to an image forming apparatus, a separation member of the process cartridge is brought into contact with a separation device of the image forming apparatus, and the developing roller and the photosensitive drum of the process cartridge are separated. A cleaning blade cleans the surface of the rotating photosensitive drum to prevent quality problems caused by residual toner on the surface of the photosensitive drum during printing.

[0004] A powder cartridge transport mechanism is provided in the image forming apparatus, and the powder cartridge transport mechanism transports the process cartridge mounted in the tray to a printing position of the process cartridge. During the transportation of the process cartridge to the printing position, the stress protrusion of the process cartridge protruding outward is pressed downward against a moving hook of the image forming apparatus. The spring below the moving hook is plastically deformed to different degrees after being compressed for a plurality of times, and thus cannot be restored to the original set length. The moving hook cannot be extended to the original set height to engage with the stress protrusion of the process cartridge, and thus the separation of the developing roller and the photosensitive drum and the cleaning of the photosensitive drum cannot be achieved, which affects the printing quality. In addition, due to the limitation of the space between the lower surface of the process cartridge and the lower surface of the cartridge compartment of the image forming apparatus, the extension amount of the separation member from the lower surface of the powder cartridge is small, and the engagement amount of the separation member and the moving hook is also small. After the spring is plastically deformed, the moving hook moves downward, and the engagement amount is even smaller, which may cause the moving hook to fail to engage with the stress protrusion, and thus the photosensitive drum cannot be cleaned, which affects the printing quality. SUMMARY

[0005] A first object of the present application is to provide a process cartridge that ensures smooth installation of the process cartridge, avoids interference with a moving hook in an image forming apparatus, and prevents plastic deformation of a spring below the moving hook, thereby affecting the printing quality.

[0006] A second object of the present application is to provide an image forming apparatus having the process cartridge.

[0007] To achieve the above first object, the application provides a process cartridge which is detachably installed in an image forming device, the image forming device being provided with a moving hook; the process cartridge comprising a developing frame, a drum frame, a developing roller and a photosensitive drum, the developing roller being rotatably supported on the developing frame, the photosensitive drum being rotatably supported on the drum frame; the developing frame being provided with a force receiving protrusion, the moving hook being capable of applying a force to the force receiving protrusion to force the developing frame to rotate relative to the drum frame, the developing frame driving the developing roller to move away from the photosensitive drum; the developing frame being provided with a separation piece, the force receiving protrusion being located on the separation piece, the separation piece being in sliding connection with the developing frame in a first direction, the first direction being perpendicular to the axial direction of the developing roller and having an included angle less than 90 degrees with the vertical direction; the process cartridge further comprising a driving mechanism, the force receiving protrusion being moved from an initial position to a cooperation position relative to the process cartridge along with the movement of the process cartridge in a horizontal direction, the driving mechanism driving the force receiving protrusion to gradually move downward from a retracted position to an extended position or the driving mechanism driving the force receiving protrusion to change from a movable state to a fixed state.

[0008] As can be seen from the above scheme, in the process of moving the process cartridge relative to the moving hook, the driving mechanism drives the force receiving protrusion to gradually move downward from the retracted position to the extended position or the driving mechanism drives the force receiving protrusion to change from the movable state to the fixed state, so that the force receiving protrusion avoids the moving hook before the force receiving protrusion passes the moving hook, thus avoiding excessive compression of the spring under the moving hook, and even avoiding contact between the force receiving protrusion and the moving hook during the movement of the force receiving protrusion, thus avoiding the problem of the force receiving protrusion repeatedly pressing the moving hook, causing the spring at the bottom of the moving hook to have plastic deformation and thus unable to restore its free length, resulting in the problem of the force receiving protrusion of the separation piece failing to hook or the service life of the image forming device being shortened.

[0009] A preferred scheme is that the driving mechanism comprises a coil and a magnet, the coil being repelled by the magnet after being electrified, one of the coil and the magnet being located on the separation piece, and the other of the coil and the magnet being located on the developing frame; the coil being de-energized, the force receiving protrusion being in the movable state and being movable along the first direction; the coil being electrified, the separation piece being kept in the fixed state under the action of the repelling force.

[0010] As can be seen, the coil is de-energized before the force receiving protrusion passes the moving hook, and the force receiving protrusion is in the movable state, thus being retracted upward when passing the moving hook, thereby avoiding interference with and applying pressure to the moving hook.

[0011] A further scheme is that the end wall of the drum frame is provided with a switch, and the image forming device is provided with a triggering part, the coil being electrified after the triggering part triggers the switch.

[0012] As can be seen, the coil is electrified after the triggering part triggers the switch by providing the switch on the end wall of the drum frame, thereby ensuring that the coil is de-energized before the force receiving protrusion passes the moving hook.

[0013] Further, the processing cartridge further comprises a time delay mechanism, the end wall of the drum frame is provided with a switch, and the image forming device is provided with a trigger portion, after the trigger portion triggers the switch, the time delay mechanism is started and the coil is energized after a preset time.

[0014] Therefore, the coil can be energized again after a preset time after the switch is triggered by setting the time delay mechanism, and the flexibility of the position of the switch is higher.

[0015] Further, the developing frame is provided with a driving head near one end of the stress protrusion, the driving head drives the photosensitive drum and / or the developing roller to rotate, the switch is provided near the driving head, and the image forming device is provided with a transmission head, the transmission head can move in the axial direction, and the trigger portion is located on the transmission head.

[0016] Therefore, by setting the trigger portion on the transmission head, the transmission head will trigger the switch during the process of extending out and engaging with the driving head of the processing cartridge.

[0017] A preferred scheme is that the separating piece is provided with a sliding groove extending along the first direction, the developing frame is provided with a guide column and a support protrusion, the sliding groove is inserted and matched with the guide column along the axial direction of the developing roller, the guide column is slidingly matched with the sliding groove, and the support protrusion is located above the guide column; one of the coil and the magnet is arranged on the side wall of the separating piece facing the support protrusion, the other of the coil and the magnet is arranged on the support protrusion, and the coil and the magnet are oppositely arranged in the first direction; and / or, the number of the sliding grooves is two or more, and the plurality of sliding grooves are arranged in parallel.

[0018] Therefore, the plurality of sliding grooves can guide the separating piece and prevent it from rotating.

[0019] A preferred scheme is that the driving mechanism comprises a guide rail, the guide rail is provided with a guide slope, the separating piece is slidingly matched with the guide slope, and from the initial position to the matching position, the guide slope is inclined from top to bottom; the processing cartridge further comprises a blocking piece, the blocking piece is detachably mounted on the developing frame, and the blocking piece can limit the stress protrusion to slide along the guide slope towards the matching position, so that the stress protrusion remains in the initial position.

[0020] Therefore, the blocking piece can block the separating piece, so that the separating piece remains in the initial position, and after the blocking piece is removed, the separating piece slides down along the guide slope to the matching position under the action of its own gravity.

[0021] Further, the bottom end of the guide slope is provided with a limiting groove, and the separating piece is provided with a clamping portion, which can be limited and matched with the limiting groove.

[0022] Therefore, the limiting groove can limit the clamping portion of the separating piece, so that the separating piece remains in the matching position.

[0023] Further, the separating member is provided with a force receiving part, the developing frame is provided with a guide groove parallel to the guide slope, the force receiving part extends into the guide groove and is in sliding fit with the guide groove; the guide groove is provided with a gravity ball, and the gravity ball is located at the upstream side of the force receiving part along the sliding direction of the force receiving part in the guide groove.

[0024] Therefore, the separating member is pushed by the gravity ball, and the separating member can not be affected in the sliding process due to the too small gravity component of the separating member in the process of sliding along the guide slope.

[0025] To achieve the above-mentioned second object, the application provides an imaging device comprising the processing cartridge. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 is a structural diagram of a pushing and separating mechanism in a processing cartridge and an imaging device according to the first embodiment of the application.

[0027] Figure 2 Fig. 2 is a structural diagram of a driving end in the processing cartridge according to the first embodiment of the application.

[0028] Figure 3 Fig. 3 is a structural diagram of the processing cartridge according to the first embodiment of the application after the end cover is hidden.

[0029] Figure 4 Fig. 4 is a schematic diagram of the separating member moving from the initial position to the matching position in the processing cartridge according to the first embodiment of the application.

[0030] Figure 5 Fig. 5 is a schematic diagram of the separating member moving from the initial position to the matching position in the processing cartridge according to the second embodiment of the application.

[0031] Figure 6 Fig. 6 is a schematic diagram of the separating member moving from the initial position to the matching position in the processing cartridge according to the third embodiment of the application.

[0032] The application will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0033] Processing cartridge and imaging device first embodiment

[0034] Reference Figures 1 to 3The imaging device of the embodiment includes a cartridge housing and a process cartridge detachably installed in the cartridge housing. The cartridge housing is provided with a first transmission head (not shown), a second transmission head (not shown), a driving mechanism (not shown), a powder cartridge conveying mechanism, a tray 105 and a push-separation mechanism 10. The driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously. The process cartridge is installed in the tray 105. The powder cartridge conveying mechanism can drive the tray 105 and the process cartridge to move to a printing working position. The push-separation mechanism 10 is located below the tray 105. The push-separation mechanism 10 includes a moving seat 101, a moving hook 102 and a spring 103. The moving hook 102 is slidably connected with the moving seat 101 and can move in a vertical direction relative to the moving seat 101. The moving seat 101 is provided with a recess 104. The moving hook 102 extends upward from the recess 104. The spring 103 is connected with the bottom end of the moving hook 102 and can force the moving hook 102 to move upward to an extended position. In addition, the moving seat 101 can move in a horizontal direction and drive the moving hook 102 to move.

[0035] 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 and a stirring frame (not shown) which are rotatably supported on the developing frame 21. The bottom of one end of the developing frame 21 is provided with a force receiving protrusion 6. The drum unit 3 includes a drum frame 31, a photosensitive drum 4 which is rotatably supported on the drum frame 31 and a cleaning blade (not shown) which is installed on the drum frame 31. The two ends of the cleaning blade are supported on the drum frame 31. The blade of the cleaning blade abuts against the photosensitive drum 4 to clean residual powder on the photosensitive drum 4. The top of the end of the drum frame 31 which is away from the force receiving protrusion 6 is provided with a spring (not shown) or the like elastic member. The first end of the spring abuts against the drum frame 31. The second end of the spring abuts against the developing frame 21. The position at which the developing frame 21 is hinged to the drum frame 31 is located between the force receiving protrusion 6 and the spring in the height direction of the process cartridge. After the moving hook 102 of the push-separation mechanism 10 in the imaging device exerts a force on the force receiving 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 developing roller 22 moves to a cleaning position relative to the photosensitive drum 4. At this time, the spring is in a compressed state under the force. The moving seat 101 drives the moving hook 102 to move reversely. After the force on the force receiving protrusion 6 is removed, the spring drives the developing frame 21 to rotate under the action of the elastic restoring force of the spring. The developing roller 22 contacts the photosensitive drum 4. The developing roller 22 moves to an imaging position relative to the photosensitive drum 4.

[0036] One axial end of the photosensitive drum 4 is provided with a first driving assembly 42. The first driving assembly 42 includes a first driving head 422. The first driving head 422 and the photosensitive drum 4 are coaxially arranged. The cross section of the first driving head 422 is a triangle with a circular hole in the center. The first driving assembly 42 is coupled with the first transmission head and receives the first driving force transmitted by the first transmission head.

[0037] The second driving assembly 5 is arranged at one axial end of the stirring frame, the first driving assembly 42 and the second driving assembly 5 are located at the same side of the processing box, the second driving assembly 5 is coupled with the second transmission head and receives the second driving force transmitted by the second transmission head. The developing frame 21 comprises a mounting plate 25 arranged at one end close to the second driving assembly 5, the mounting plate 25 is provided with a supporting hole 251, and the second driving assembly 5 is mounted at the supporting hole 251.

[0038] One axial end of the developing roller 22 is sleeved with a developing roller gear 222, the developing roller gear 222 can drive the developing roller 22 to rotate, the second driving assembly 5 comprises an integrally formed transmission gear 51 and a second driving head 52, the second driving head 52 has a triangular cross section with a circular hole at the center, the transmission gear 51 is coaxially arranged with the second driving head 52, the axis of the second driving assembly 5 is parallel to the axis of the developing roller 22, and the transmission gear 51 is engaged with the developing roller gear 222.

[0039] The developing frame 21 is provided with a separation piece 7, the stress protrusion 6 is located on the separation piece 7, the separation piece 7 is in sliding connection with the developing frame 21 in a first direction Z, the first direction Z is perpendicular to the axial direction of the developing roller 22 and the included angle between the first direction Z and the vertical direction is less than 90 degrees, in the embodiment, the first direction Z is parallel to the vertical direction, that is, the included angle between the first direction Z and the vertical direction is 0 degree. Specifically, the separation piece 7 is provided with two sliding grooves 71 which extend along the first direction Z, the developing frame 21 is provided with a guide column 211 and a supporting protrusion 212, the sliding grooves 71 are in plug-in cooperation with the guide column 211 along the axial direction of the developing roller 22, the guide column 211 is in sliding cooperation with the sliding grooves 71 in the first direction Z, and the supporting protrusion 212 is located above the guide column 211.

[0040] The processing box further comprises a driving mechanism 8, along with the movement of the processing box in the horizontal direction, the stress protrusion 6 moves from the initial position to the fitting position relative to the processing box, and the driving mechanism 8 drives the stress protrusion 6 to change from the active state to the fixed state.

[0041] The driving mechanism 8 comprises a coil 81 and a magnet 82, the coil 81 is electrified to repel the magnet 82, the magnet 82 is located on the side wall of the separating piece 7 facing the supporting protrusion 212, the coil 81 is located on the supporting protrusion 212, and the coil 81 and the magnet 82 are oppositely arranged in the first direction Z. When the coil 81 is de-energized, the stressed protrusion 6 is in the active state, and the stressed protrusion 6 can move along the first direction Z; when the coil 81 is electrified, the separating piece 7 is kept in the fixed state under the repulsive force. Before the stressed protrusion 6 passes the moving hook 102, the coil 81 is de-energized, and the stressed protrusion 6 is in the active state, so that the stressed protrusion 6 is retracted upward when passing the moving hook 102, thereby avoiding interference with the moving hook 102 and applying pressure to the moving hook 102. In addition, the end wall of the drum frame 31 is also provided with a switch 311, and the imaging device is provided with a trigger part (not shown), and the trigger part triggers the switch 311, and the coil 81 is electrified.

[0042] In combination Figure 1 And Figure 4 After the processing cartridge is installed, the powder cartridge conveying mechanism drives the tray 105 and the processing cartridge to move to the right along the horizontal direction X to the printing working position of the processing cartridge. During the movement of the processing cartridge, before the trigger part triggers the switch 311, the coil 81 is in a de-energized state, the stressed protrusion 6 is in an active state and can move along the first direction Z, and the stressed protrusion 6 is always in an active state before the stressed protrusion 6 passes the moving hook 102. Therefore, when the stressed protrusion 6 is moved to the position interfering with the moving hook 102 by the processing cartridge, the stressed protrusion 6 moves along the first direction Z away from the moving hook 102, thereby avoiding the moving hook 102 and not interfering with the moving hook 102 to apply pressure to the moving hook 102. After the stressed protrusion 6 passes the moving hook 102, the trigger part triggers the switch 311, and the coil 81 is electrified. After the coil 81 is electrified, the coil 81 repels the magnet 82. Since the magnet 82 is fixed on the separating piece 7, the separating piece 7 moves along the first direction Z towards the moving hook 102 under the repulsive force until the guide column 211 abuts against the top end of the sliding groove 71. At this time, the separating piece 7 is kept in the fixed state, and the stressed protrusion 6 is kept in the extended position. At this time, the moving hook 102 is located between the photosensitive drum 4 and the stressed protrusion 6.

[0043] The working method of the processing cartridge comprises an imaging step and a cleaning step, and the imaging step and the cleaning step are alternately performed during the working process of the processing cartridge.

[0044] The imaging step includes: the driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously, at this time, the developing roller 22 is in contact with the photosensitive drum 4, the first transmission head drives the first driving assembly 42 to rotate, thereby driving the photosensitive drum 4 to rotate, the second transmission head drives the second driving assembly 5 to rotate, thereby driving the developing roller 22 and the stirring frame to rotate, the stirring frame is used for stirring the toner in the powder bin of the developing unit 2, and the developing roller 22 cooperates with the photosensitive drum 4 to perform the imaging work.

[0045] The cleaning step includes: the driving mechanism drives the first transmission head and the second transmission head to rotate simultaneously, at this time, the moving seat 101 in the imaging device drives the moving hook 102 to move along the horizontal direction to the right and applies the force to the stress convex 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 transmission head drives the first driving assembly 42 to rotate, thereby driving the photosensitive drum 4 to rotate, the second transmission head drives the second driving assembly 5 to rotate, thereby driving the developing roller 22 and the stirring frame to rotate, and the cleaning scraper cleans the residual powder on the surface of the photosensitive drum 4. The rotating speed of the developing roller 22 in the imaging step is greater than the rotating speed of the developing roller 22 in the cleaning step, and the rotating speed of the photosensitive drum 4 in the imaging step is greater than the rotating speed of the photosensitive drum 4 in the cleaning step. The rotating speed of the developing roller 22 in the cleaning step is small, which can ensure that the developing roller 22 does not deliver the toner outward when the photosensitive drum 4 is cleaned.

[0046] In other embodiments, the second driving assembly 5 and the developing roller 22 are connected through a clutch, 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.

[0047] The processing cartridge and the imaging device second embodiment

[0048] As an illustration of the processing cartridge and the imaging device second embodiment of the present application, only the differences from the processing cartridge and the imaging device first embodiment described above will be described below.

[0049] Reference Figure 5 The driving mechanism 28 in the embodiment can drive the stress convex 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 guide inclined surface 282, the separation piece 27 is in sliding cooperation with the guide inclined surface 282, from the initial position 201 to the cooperation position 202, the guide inclined surface 282 is arranged obliquely from top to bottom.

[0050] The processing cartridge further comprises a blocking piece 29 which is detachably mounted on the developing frame and capable of limiting the forced protrusion 26 from sliding along the guide slope 282 towards the matching position 202 so as to keep the forced protrusion 26 in the initial position 201. The bottom end of the guide slope 282 is provided with a limiting slot 283, and the separating piece 27 is provided with an engaging portion 271 which is capable of limiting cooperation with the limiting slot 283. The bottom surface of the engaging portion 271 is provided with an engaging slope 272 which is parallel to the guide slope 282 and capable of sliding cooperation with the guide slope 282.

[0051] The blocking piece 29 is capable of blocking the separating piece 27 so as to keep the separating piece 27 in the initial position 201. When the blocking piece 29 is removed, the separating piece 27 slides downwards along the guide slope 282 to the limiting slot 283 of the matching position 202 under the action of its own gravity, the engaging portion 271 of the separating piece 27 is engaged with the limiting slot 283, and at this time, the moving hook 102 is located between the initial position 201 and the matching position 202. The limiting slot 283 is capable of limiting the engaging portion 271 of the separating piece 27, so as to keep the separating piece 27 in the matching position 202.

[0052] When the processing cartridge is removed, the separating piece 27 is manually moved to the initial position 201 and then the blocking piece 29 is mounted again, so that the processing cartridge returns to the initial state for reinstallation. Preferably, the blocking piece 29 is a baffle which is inserted into the processing cartridge in the vertical direction to block the sliding of the separating piece 27.

[0053] The processing cartridge and the image forming device of the third embodiment

[0054] As an illustration of the third embodiment of the processing cartridge and the image forming device of the present application, only the differences from the second embodiment of the processing cartridge and the image forming device described above will be described below.

[0055] Referring to Figure 6 In the present embodiment, the separating piece 37 is provided with a forced portion 371, and the developing frame is provided with a guide slot 370 which is parallel to the guide slope 382. The forced portion 371 extends into the guide slot 370 and is capable of sliding cooperation with the guide slot 370. The guide slot 370 is provided with the gravity ball 30 which is located on the upstream side of the forced portion 371 along the sliding direction of the forced portion 371 in the guide slot 370.

[0056] The gravity ball 30 is capable of pushing the separating piece 37, so as to avoid the situation that the separating piece 37 is affected in the sliding process due to the too small gravity component of the separating piece 37 itself during the process of sliding downwards along the guide slope 382.

[0057] From the above, during the movement of the process cartridge relative to the moving hook, the force receiving protrusion is gradually moved downward from the retracted position to the extended position by the driving mechanism or the force receiving protrusion is changed from the active state to the fixed state by the driving mechanism, so that the force receiving protrusion will avoid the moving hook before the force receiving protrusion passes the moving hook, and thus the moving hook is not subjected to excessive compression by the spring below the moving hook, or even the force receiving protrusion does not contact the moving hook during the movement of the force receiving protrusion, so that the problem of the force receiving protrusion repeatedly pressing the moving hook, the spring at the bottom of the moving hook being plastically deformed to a certain extent, and the force receiving protrusion of the separation member not being caught or the service life of the image forming device being shortened can be avoided. In addition, after the developing roller and the photosensitive drum are separated in the cleaning step, the first driving assembly still drives the photosensitive drum to rotate, and the second driving assembly still drives the developing roller to rotate. After the cleaning blade of the drum unit cleans the photosensitive drum, the developing roller moves to the imaging position, i.e., the developing roller contacts the photosensitive drum, and the driving mechanism of the image forming device drives the first driving assembly and the second driving assembly to rotate, thereby driving the developing roller and the photosensitive drum to rotate simultaneously. Therefore, the switching process of the cleaning step and the imaging step is more simple and smooth, and the situation of jamming or failure of the second driving assembly to connect with the developing roller does not occur, which causes the driving to be unable to be transmitted to the rotating mechanism such as the developing roller. Moreover, the structure of the second driving assembly of the process cartridge is simplified, 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 at the cleaning position, the developing roller stops rotating, which can avoid the developing roller rotating all the time to cause friction between the developing roller and the toner, resulting in wear of the rubber layer on the developing roller. The imaging step and the cleaning step are alternately performed, which can improve the printing quality. When the imaging step and the cleaning step are alternately performed, the developing roller and the second transmission head are always in a coupled state, compared with the developing roller and the second transmission head being separated in the cleaning step and coupled in the imaging step in the prior art, the work efficiency can be greatly improved, and the situation of failure of the developing roller and the second transmission head to be coupled does not occur.

[0058] In addition, the processing box further comprises a time delay mechanism, after the trigger part triggers the switch, the time delay mechanism is started and the coil is energized after a preset time. The switch can also be arranged close to the first driving head or the second driving head, the imaging device is provided with the first driving head and the second driving head, the first driving head and the second driving head can move in and out along the axial direction, the trigger part is located on the first driving head or the second driving head, and the trigger part triggers the switch by the extension and retraction of the corresponding driving head. The coil can also be arranged on the separating piece, and the magnet is arranged on the developing frame. The number and shape of the guide column and the sliding groove can be changed according to the needs. The number of driving mechanisms in the imaging device can also be two, and the two driving mechanisms drive the first driving head and the second driving head to rotate respectively. The time delay mechanism can also be realized by other structures, such as arranging a force storage torsional spring and a ratchet mechanism to cooperate, and delaying the outward movement of the separating piece to avoid that the separating piece moves down to move the hook during installation. The above changes can also achieve the purpose of the present application.

[0059] Finally, it should be emphasized that the above is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A process cartridge detachably mountable in an image forming apparatus, the image forming apparatus being provided with a moving hook; the process cartridge comprising 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 being provided with a force receiving protrusion, the moving hook being capable of applying a force to the force receiving protrusion to force the developing frame to rotate relative to the drum frame, the developing frame bringing the developing roller away from the photosensitive drum; characterized in that: the developing frame is provided with a separation piece, the force receiving protrusion being located on the separation piece, the separation piece being in sliding connection with the developing frame in a first direction, the first direction being perpendicular to an axial direction of the developing roller and having an angle less than 90 degrees with a vertical direction; the process cartridge further comprising a driving mechanism, the force receiving protrusion being moved from an initial position to a cooperating position relative to the process cartridge along with movement of the process cartridge in a horizontal direction, the driving mechanism driving the force receiving protrusion to gradually move downward from a retracted position to an extended position or the driving mechanism driving the force receiving protrusion to change from an active state to a fixed state, so that the force receiving protrusion is not in contact with the moving hook during the movement or is in contact with the moving hook only under the gravity of the force receiving protrusion; the driving mechanism comprising a coil and a magnet, the coil being repulsive to the magnet after being energized, one of the coil and the magnet being located on the separation piece, the other of the coil and the magnet being located on the developing frame; the coil being de-energized, the force receiving protrusion being in the active state, the force receiving protrusion being movable along the first direction; the coil being energized, the separation piece being kept in the fixed state under the repulsive force. 2.The process cartridge according to claim 1, characterized in that: an end wall of the drum frame is provided with a switch, the image forming apparatus is provided with a trigger portion, the trigger portion triggering the switch, the coil being energized. 3.The process cartridge according to claim 1, characterized in that: the process cartridge further comprising a time delay mechanism, an end wall of the drum frame is provided with a switch, the image forming apparatus is provided with a trigger portion, the trigger portion triggering the switch, the time delay mechanism being started and the coil being energized after a preset time. 4.The process cartridge according to claim 2 or 3, characterized in that: an end of the developing frame close to the force receiving protrusion is provided with a driving head, the driving head driving the photosensitive drum and / or the developing roller to rotate; the switch is close to the driving head, the image forming apparatus is provided with a transmission head, the transmission head being movable in an axial direction, the trigger portion being located on the transmission head. 5.The process cartridge according to any one of claims 1 to 3, characterized in that: the separation piece is provided with a sliding groove extending along the first direction, the developing frame is provided with a guide column and a supporting protrusion, the sliding groove is in plug-in cooperation with the guide column along the axial direction of the developing roller, the guide column is in sliding cooperation with the sliding groove, the supporting protrusion is located above the guide column. One of the coil and the magnet is arranged on a side wall of the separation piece facing the support protrusion, and the other of the coil and the magnet is arranged on the support protrusion, the coil and the magnet being oppositely arranged in the first direction; And / or, the number of the sliding grooves is two or more, and the plurality of sliding grooves are arranged in parallel.

6. A process cartridge, which is detachably installed in an image forming apparatus, the image forming apparatus being provided with a moving hook; The process cartridge comprises a developing frame, a drum frame, a developing roller and a photosensitive drum, the developing roller being rotatably supported on the developing frame, the photosensitive drum being rotatably supported on the drum frame; The developing frame is provided with a force receiving protrusion, the moving hook being capable of applying a force to the force receiving protrusion to force the developing frame to rotate relative to the drum frame, the developing frame driving the developing roller to move away from the photosensitive drum; It is characterized in that: The developing frame is provided with a separation piece, the force receiving protrusion being located on the separation piece, the separation piece being in sliding connection with the developing frame in a first direction, the first direction being perpendicular to an axial direction of the developing roller and having an included angle less than 90 degrees with a vertical direction; The process cartridge further comprises a driving mechanism, the force receiving protrusion being moved from an initial position to a fitting position relative to the process cartridge along with movement of the process cartridge in a horizontal direction, the driving mechanism driving the force receiving protrusion to gradually move downward from a retracted position to an extended position or the driving mechanism driving the force receiving protrusion to change from a movable state to a fixed state, so that the force receiving protrusion does not contact the moving hook during movement or only contacts the moving hook under the gravity of the force receiving protrusion; The driving mechanism comprises a guide rail, the guide rail being provided with a guide slope, the separation piece being in sliding fit with the guide slope, the guide slope being inclined from top to bottom from the initial position to the fitting position; The process cartridge further comprises a blocking piece, the blocking piece being detachably installed on the developing frame, the blocking piece being capable of limiting the force receiving protrusion from sliding along the guide slope toward the fitting position, so that the force receiving protrusion is kept in the initial position.

7. The process cartridge according to claim 6, characterized in that: A limiting groove is formed at a bottom end of the guide slope, the separation piece is provided with an engaging portion, and the engaging portion is in limiting fit with the limiting groove.

8. The process cartridge according to claim 6, characterized in that: The separation piece is provided with a force receiving portion, the developing frame is provided with a guide groove, the guide groove being parallel to the guide slope, the force receiving portion extending into the guide groove and being in sliding fit with the guide groove; A gravity ball is arranged in the guide groove, the gravity ball being located on an upstream side of the force receiving portion along a sliding direction of the force receiving portion in the guide groove.

9. An imaging device, characterized by, The process cartridge according to any one of claims 1 to 8.

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