Processing box

Abstract

The invention provides a process cartridge, which is detachably mounted in an electrophotographic imaging device provided with an electric power component, and comprises a photosensitive drum, a developing roller and a charging component for charging the photosensitive drum, the process cartridge further includes: a power supply capable of contacting the power component to receive power, the power supply being capable of supplying power to the developing roller; the grounding component can be switched between a state of being electrically connected with the developing roller and a state of being not electrically connected with the developing roller, and when the developing roller is not electrically connected with the grounding component, the developing roller has a first voltage value; when the developing roller is electrically connected with the grounding component, the developing roller has a second voltage value; the absolute value of the first voltage value is greater than that of the second voltage value; according to the processing box with the structure, during cleaning operation, the developing roller and the photosensitive drum do not need to be separated, and meanwhile, the technical problem that printing defects are caused due to the fact that carbon powder on the developing roller is transferred to the photosensitive drum during cleaning operation is solved.

Description

A processing box Technical Field

[0001] The present invention relates to the technical field of electronic photographic imaging, in particular to a processing box. Background Art

[0002] In imaging devices that use electrophotography to create images, such as laser printers, copiers, and fax machines, these devices typically include at least one electrode assembly and a developer transfer assembly. The electrode assembly includes at least one charging electrode, a developing electrode, and at least one ground terminal. Some devices also include a supply electrode. The transfer assembly includes developer transport components such as a transfer roller and a transfer belt. The device also includes a process cartridge that is removable from the imaging device. Existing process cartridges primarily include integrated process cartridges that integrate a photosensitive drum unit and a developing unit, and split process cartridges that include only a photosensitive drum unit or a developing unit.

[0003] In an integrated process cartridge, the photosensitive drum unit and the developer unit are typically rotatably connected to each other. The photosensitive drum unit includes a photosensitive unit frame, a photosensitive drum rotatably supported by the photosensitive unit frame, a charging roller, and the like. The developer unit includes a developer unit frame, a developer roller rotatably supported by the developer unit frame, a powder hopper, and the like. During the process cartridge's imaging operation, the photosensitive drum and the developer roller come into contact with each other. In the case of an imaging device employing a developing method in which the developer roller is placed in contact with the photosensitive drum to develop the latent image on the photosensitive drum, the developer roller remains pressed against the outer peripheral surface of the photosensitive drum. During periods when the process cartridge is not in imaging operation, the photosensitive drum, transfer roller, or transfer belt, etc., require cleaning.

[0004] The existing process box is provided with a force receiving mechanism. During the imaging operation, the developing roller and the photosensitive drum are in contact. During cleaning, the force receiving mechanism receives the force of the imaging device and separates the developing roller and the photosensitive drum. However, this force receiving mechanism is relatively complex.

[0005] A process cartridge is disclosed, which is removably mounted in an imaging device. The process cartridge includes: a developing unit and a photosensitive unit, the photosensitive unit including a photosensitive unit frame and a photosensitive drum, and the developing unit including a developing unit frame and a developing roller; a first force receiving assembly located at a first end of the process cartridge in a longitudinal direction, for receiving a force from a first force applying portion; a cartridge-side developing electrode located at a second end of the process cartridge in a longitudinal direction; a switch device located at the first end of the process cartridge, the switch device including a second force receiving assembly, a first electrically connected member, and a second electrically connected member, the second force receiving assembly including a second force receiving member and a first elastic member, the first electrically connected member being connected to the second force receiving member and the developing roller; and the second electrically connected member being connected to the cartridge-side developing electrode. The second force receiving member is movable relative to the developing unit frame between a first position and a second position and between the second position and a third position. When the process cartridge is mounted in the imaging device, the second force receiving member is in the second position during imaging operation, with the first electrically connected member electrically contacting the second electrically connected member, and the second force receiving member is in the third position during non-imaging operation, with the first electrically connected member not contacting the second electrically connected member.

[0006] In a processing box of this structure, during the imaging operation, the developing roller and the photosensitive drum are in contact with each other, and the developing roller is charged. During the non-imaging operation, the developing roller and the photosensitive drum do not need to be separated, and the two remain in contact, but the power supply to the developing roller is disconnected. During the non-imaging operation (such as the cleaning operation), since the developing roller and the photosensitive drum are in contact with each other, the developing roller will receive electricity from the photosensitive drum. The direction of the electric field between the developing roller and the photosensitive drum has not changed, and the potential difference between the two is not large (or there is no potential difference). There is a situation in which the toner on the developing roller will be affected by the shear force or instantaneous electric field force on the surface of the photosensitive drum and transferred to the surface of the photosensitive drum, making it impossible to clean the toner on the surface of the photosensitive drum, thereby further contaminating the transfer belt, transfer roller, and photosensitive drum, causing printing defects.

[0007] Summary of the Invention

[0008] The present invention provides a processing box adopting the following solution to solve the technical problem that during non-imaging operation, the photosensitive drum and the developing roller are not separated, and the carbon powder on the developing roller is transferred to the photosensitive drum, resulting in printing defects.

[0009] A processing box can be removably installed in the main component of an electronic photographic imaging device provided with an electrical component, the processing box includes a photosensitive drum, a developing roller and a charging component for charging the photosensitive drum; the processing box also includes: a power supply component that can contact the power component to receive power, and the power supply component can supply power to the developing roller; a grounding member that can switch between a state electrically connected to the developing roller and a state not electrically connected, when the developing roller is not electrically connected to the grounding member, the developing roller has a first voltage value; when the developing roller is electrically connected to the grounding member, the developing roller has a second voltage value; the absolute value of the first voltage value is greater than the absolute value of the second voltage value.

[0010] Preferably, the processing box also includes a connecting member, which can be electrically connected to the developing roller, and the connecting member can be electrically connected to the power supply member or can be switched between an electrically connected state and an electrically non-connected state with the power supply member; the connecting member can be switched between a state of being electrically connected to the grounding member and a state of being electrically non-connected.

[0011] Preferably, at least a portion of the connector is movable between a first position electrically connected to the power supply element and a second position electrically connected to the ground member.

[0012] Preferably, the developing roller includes a developing roller shaft and a first main body supported on the developing roller shaft; the connecting member has a first connecting end and a second connecting end, the first connecting end is electrically connected to the developing roller shaft, and the second connecting end is capable of moving between a first position in contact with the power supply member and a second position in contact with the grounding member; when the second connecting end is in the first position, the developing roller has a first voltage value, and when the second connecting end is in the second position, the developing roller has a second voltage value, and the absolute value of the first voltage value is greater than the absolute value of the second voltage value.

[0013] Based on the inventive concept of the present invention, the present invention also provides a processing cartridge that can be detachably installed in a main assembly of an electronic photographic imaging device provided with an electrical component, wherein the processing cartridge includes a photosensitive drum, a developing roller, and a charging component for charging the photosensitive drum; the processing cartridge also includes: a power supply component capable of contacting the power component to receive power; a connecting member capable of electrically connecting to the developing roller, the connecting member capable of electrically connecting to the power supply component or capable of switching between an electrically connected state and an electrically disconnected state with the power supply component; and a grounding member, at least a portion of the connecting member capable of switching between an electrically connected state and an electrically disconnected state with the grounding member. With the processing cartridge of the above structure, the developing roller and the photosensitive drum do not need to be separated during the cleaning operation, the cartridge body structure is simpler, and the technical problem of printing defects caused by the toner on the developing roller being transferred to the photosensitive drum during the cleaning operation is solved.

[0014] Preferably, at least a portion of the connector is movable between a first position electrically connected to the power supply element and a second position electrically connected to the ground member.

[0015] Preferably, when in the first position, the connecting member is electrically connected to the power supply member; when in the second position, the connecting member is electrically connected to the power supply member and the grounding member at the same time.

[0016] Preferably, the connecting member also includes a force receiving end, which is capable of moving between a protruding position and a retracted position. In the protruding position, the force receiving end is capable of receiving the force of the force-applying component of the imaging device so that at least a portion of the connecting member moves between the first position and the second position.

[0017] Preferably, the processing box further comprises an elastic member, and the elastic member is used to keep the force receiving end in the retracted position.

[0018] Preferably, at least a portion of the grounding member and / or the power supply member is movable between a position electrically connected to the connection member and a position not electrically connected to the connection member.

[0019] Preferably, the process cartridge further comprises a retaining mechanism capable of maintaining the electrical connection between the connector and the power supply member during an imaging operation and maintaining the electrical connection between the connector and the grounding member during a cleaning operation.

[0020] Preferably, the processing box also includes a first conductive component arranged on the upper side of the processing box, which contacts the electronic photographic imaging device and receives electricity; the charging component is a charging roller, which is electrically connected to the first conductive component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the process cartridge in Example 1;

[0022] FIG2 is a schematic diagram of the overall structure of the process cartridge of Example 1 from another angle;

[0023] 3 is a schematic structural diagram of a driving end of a process cartridge according to embodiment 1;

[0024] 4 is a schematic structural diagram of the conductive end of the process cartridge of Example 1;

[0025] Figure 5 is a sectional view of the process cartridge of Example 1;

[0026] 6 is a partial exploded view of the process cartridge of Example 1;

[0027] FIG7 is a partial exploded view of the structure of the photosensitive unit of Example 1;

[0028] FIG8 is a partial exploded view of the developing unit of Example 1;

[0029] 9 is a schematic structural diagram of a developing unit according to Example 1;

[0030] 10 is a schematic diagram of the assembly structure of the first cover member, the power supply member, the grounding member and the first conductive component of Example 1;

[0031] 11 is a schematic diagram of the assembly structure of the first cover member, the power supply member, the grounding member and the first conductive component in accordance with Embodiment 1 when viewed from another angle;

[0032] 12 is a schematic diagram of the exploded structure of the first cover member, the power supply member, the grounding member and the first conductive assembly of Example 1;

[0033] 13 is a partial circuit schematic diagram of Example 1 when the connecting member is electrically connected to the grounding member;

[0034] 14 is a partial circuit schematic diagram of Example 1 when the connecting member is electrically connected to the power supply member;

[0035] 15 is a diagram showing the relationship between the force receiving end and the force applying member when the process cartridge of Example 1 is loaded into the imaging device but the door cover is not closed;

[0036] Figures 16 and 17 are diagrams showing the relationship between the connecting member and the force applying member after the process cartridge of Example 1 is installed in the imaging device and the door cover is closed;

[0037] 18 is a diagram showing the cooperation relationship between the force applying member and the electrical switching assembly when the process cartridge of Example 1 is in an imaging operation;

[0038] 19 is a diagram showing the cooperation relationship between the force applying member and the electrical switching assembly when the process cartridge of Example 1 is in a cleaning operation;

[0039] 20 is a schematic structural diagram of the electrical switching assembly of the process cartridge of Example 2;

[0040] 21 is a diagram showing the relationship between the force receiving end and the force applying member after the process cartridge of Example 2 is loaded into the imaging device and the door cover is closed;

[0041] 22 is a diagram showing the relationship between the action of the force applying member and the electrical switching assembly when the process cartridge of Example 2 is in an imaging operation and the force applying member is in the fourth position;

[0042] 23 is a diagram showing the relationship between the action of the force applying member and the electrical switching assembly when the process cartridge of Example 2 is in an imaging operation and the force applying member is in the third position;

[0043] 24 is a diagram showing the relationship between the connecting member and the power supply member when the process cartridge of Example 2 is in an imaging operation;

[0044] 25 is a diagram showing the relationship between the action of the force applying member and the electrical switching assembly when the process cartridge of Example 2 is in a cleaning operation and the force applying member is in the fifth position;

[0045] 26 is a diagram showing the coordination relationship between the force applying member and the electrical switching assembly when the process cartridge of Example 2 is in a cleaning operation and the force applying member is in the third position;

[0046] 27 is a diagram showing the relationship between the connector and the grounding member when the process cartridge of Example 2 is in a cleaning operation;

[0047] FIG28 is a partial circuit schematic diagram of Example 3 when the connecting member is electrically connected to the grounding member;

[0048] 29 is a partial circuit schematic diagram of Example 3 when the connecting member is electrically connected to the power supply member;

[0049] FIG30 is a schematic structural diagram of an electrical switching assembly according to Example 3;

[0050] FIG31 is a schematic diagram of the exploded structure of the electrical switching assembly of Example 3;

[0051] FIG32 is a partial circuit schematic diagram of Example 4 when the connecting member is electrically disconnected from the grounding member;

[0052] 33 is a partial circuit schematic diagram of Example 4 when the connecting member is electrically connected to the grounding member;

[0053] 34 is a partial circuit schematic diagram of Example 5 when the connecting member is not electrically connected to the power supply member;

[0054] FIG35 is a partial schematic diagram of a circuit in which the connecting member is electrically connected to the power supply member in accordance with Embodiment 5;

[0055] FIG36 is a partial circuit schematic diagram of Example 5 when the connecting member is electrically connected to the grounding member;

[0056] FIG37 is a partial circuit schematic diagram of Example 6 when the connecting member is not electrically connected to the grounding member;

[0057] Figure 38 is a schematic diagram of a local circuit when the connecting member of Example 6 is electrically connected to the grounding component. DETAILED DESCRIPTION

[0058] The present invention will be further described below with reference to the embodiments and Figures 1 to 29 thereof.

[0059] Example 1

[0060] As shown in Figures 1 to 19, the process cartridge 10 includes a photosensitive unit 1 and a developing unit 2. The photosensitive unit 1 includes a photosensitive unit frame 11, a driving end 111, a conductive end 112, a photosensitive drum 12, a charging component 13, and a first driving unit 15. The driving end 111 and the conductive end 112 are respectively disposed at the ends of the photosensitive unit frame 11 in the longitudinal direction. The driving end 111 and the conductive end 112 can be considered as part of the photosensitive unit frame 11 and can be integrally formed with the photosensitive unit frame 11 or assembled separately. In this embodiment, the driving end 111 and the conductive end 112 are respectively configured as a first cover member 111 and a second cover member 112, which cover the ends of the photosensitive unit frame 11 and support the photosensitive drum 12 and the charging component 13.

[0061] The photosensitive drum 12 is rotatably supported on the photosensitive unit frame 11. The charging member is preferably a charging roller 13, which is rotatably supported on the photosensitive unit frame 11. The charging member 13 is configured to contact the photosensitive drum 12 to charge the photosensitive drum 12. A first driving unit 15 is provided at one end of the photosensitive drum 12 to receive a driving force from the imaging device and drive the photosensitive drum 12 and the charging roller 13 to rotate.

[0062] The developing unit 2 includes a developing unit frame 21, a developing roller 22, a powder feed roller 23, and a second drive unit 25. The developing unit frame 21 is connected to the photosensitive unit frame 11. The developing roller 22 is rotatably supported on the developing unit frame 21, so that the developing roller 22 and the photosensitive drum 12 are in contact with each other, allowing toner on the developing roller 22 to be transferred to the surface of the photosensitive drum 12 during imaging. The developing roller 22 includes a developing roller shaft 221 and a first main body 222 supported on the developing roller shaft 221. The powder feed roller 23 is rotatably supported on the developing unit frame 21 to supply toner to the developing roller 22. The second drive unit 25 is provided at one end of the developing unit 2 to receive driving force from the imaging device and supply driving force to the developing roller 22 and the powder feed roller 23, enabling them to rotate.

[0063] In this embodiment, the process cartridge 10 further includes a first conductive component 6, which is electrically connected to the imaging device and receives power from the imaging device. More specifically, the first conductive component 6 is electrically connected to a charging electrode of the imaging device. The first conductive component 6 is also electrically connected to the charging roller 13 to provide power to the charging roller 13. The charging roller 13 contacts the photosensitive drum 12 and charges the photosensitive drum 12.

[0064] After repeated research and many experiments, it was found that in a process box 10 using negatively charged toner, when the process box 10 is in the imaging operation period, the charging roller 13 receives the voltage (such as -900V) from the charging electrode of the imaging device and is in the gap formed by the contact with the photosensitive drum 12, ionizing the air to generate electrons, and the electrons are distributed to the surface of the photosensitive drum 12, forming a voltage (such as -600V) on the surface of the photosensitive drum 12. During the imaging operation, the device receives a print instruction, the laser transmitter emits a laser, and irradiates the surface of the photosensitive drum 12, causing the surface of the photosensitive drum 12 to be negatively charged. The printed area is exposed, causing the voltage at the exposed position to increase, with the potential at the exposed position increasing to a value higher than -300V, preferably between -200V and -100V. At this time, the developing roller 22 receives the developing voltage of the device (e.g., -300V). At this time, the voltage at the exposed area of ​​the photosensitive drum 12 (e.g., -200V) is higher than the voltage on the developing roller 22 (e.g., -300V). At this time, the direction of the electric field points to the developing roller 22, and the negatively charged toner is transferred from the developing roller 22 to the exposed position on the surface of the photosensitive drum 12, thereby obtaining a printed image. In the non-exposed area, the surface voltage of the photosensitive drum 12 (e.g., -600V) is lower than the surface voltage of the developing roller 22 (e.g., -300V). The direction of the electric field in this area points to the photosensitive drum 12, so the electric field force received by the negatively charged toner in this area points to the developing roller 22. The toner on the surface of the developing roller 22 will not be transferred to the surface of the photosensitive drum 12, so that no toner is deposited on the non-printing area. During the period when the processing box 10 is in non-imaging operation (such as in the cleaning state), when the voltage supplied to the developing roller 22 is cut off, but the developing electrode is usually an open source electrode, therefore, since the developing roller 22 is kept in contact with the photosensitive drum 12, the photosensitive drum 12 can transfer electricity to the developing roller 22 through the conductive effect of the carbon powder, so that the developing roller maintains a certain charge. As a result, the voltage potential difference between the developing roller 22 and the surface of the photosensitive drum 12 is very small, or sometimes the direction of the electric field will point to the developing roller. At this time, the negatively charged carbon powder on the developing roller 22 can be transferred to the surface of the photosensitive drum 12 under the action of the friction shear force between the photosensitive drum 12 and the developing roller 22 or the reverse electric field force, causing the photosensitive drum 12 to be contaminated by carbon powder, and then causing the carbon powder to adhere to the transfer belt, resulting in the photosensitive drum 12 and / or the transfer belt not being cleaned properly, causing printing defects.

[0065] To solve the above-mentioned defects, this embodiment provides a new technical solution.

[0066] As shown in Figures 1 to 12, the processing box 10 of this embodiment also includes an electrical switching assembly 5, which includes a voltage regulating member, a power supply member 52 and a connecting member 53, wherein the voltage regulating member can adjust the voltage supplied to the developing roller 22, which is different from the voltage supplied by the power supply member 52. The preferred voltage regulating member is a grounding member 51, and the connecting member 53 can be electrically connected to the developing roller 22. At least a portion of the connecting member 53 can move between a first position in contact with the power supply member 52 and a second position in contact with the grounding member 51.

[0067] In other words, at least a portion of the connection member 53 is movable between a first position where it is electrically connected to the power supply member 52 and a second position where it is electrically connected to the ground member 51 .

[0068] Specifically, the following description will be made by taking an imaging device system that supplies negative charge and uses negatively charged toner as an example.

[0069] In this embodiment, the electrical switching assembly 5 is provided at one conductive end of the process cartridge 10 (the end where the conductive end 112 is located).

[0070] In conjunction with Figures 18 and 19 , the power supply member 52 can be electrically connected to the imaging device, more specifically, the power supply member 52 is electrically connected to the developing electrode or supply electrode of the imaging device. During the imaging operation, at least a portion of the connecting member 53 is in the first position, the connecting member 53 contacts the power supply member 52, and the developing roller 22 is charged. At this time, the voltage of the developing roller 22 is lower than the voltage at the exposed position on the photosensitive drum 12. The direction of the electric field formed between the exposed area and the developing roller 22 is directed toward the developing roller 22. At this time, the negatively charged toner can be transferred from the developing roller 22 to the exposed position on the photosensitive drum 12 under the action of the electric field force directed toward the photosensitive drum 12, thereby forming an electrostatic latent image. Preferably, the power supply member 52 is disposed on the second cover member 112, and at least a portion is exposed outward from the second cover member 112. When the process cartridge 10 is installed in the imaging device, the power supply member 52 can contact the power components within the main assembly of the imaging device to receive power. Preferably, the power supply component 52 can be made of a conductive metal component or a conductive resin, and can be integrally formed with the second cover component 112 or can be separately provided.

[0071] The grounding member 51 is configured to be grounded, specifically by being electrically connected to the imaging device. During the cleaning operation of the processing cartridge and the imaging device, at least a portion of the connector 53 is in the second position, the connector 53 is connected to the grounding member 51, and the voltage on the developing roller 22 is pulled down to 0. As a result, the voltage on the photosensitive drum 12 (e.g., -600V) is lower than the voltage on the developing roller 22 (e.g., 0V). At this time, the electric field formed between the developing roller 22 and the photosensitive drum 12 is directed toward the photosensitive drum, and the electric field force on the negatively charged toner is directed toward the developing roller 22. Therefore, the negatively charged toner attached to the developing roller 22 cannot be transferred to the photosensitive drum 12 under the action of the electric field force, thereby preventing the photosensitive drum 12 from being contaminated.

[0072] Preferably, at least a portion of the grounding member 51 is exposed outward from the second cover member 112 and is electrically connected to a grounding assembly within the main assembly of the imaging device when the process cartridge 10 is installed in the imaging device to achieve grounding. Specifically, the grounding member 51 includes a first grounding member 511 and a second grounding member 512. One end of the first grounding member 511 passes through a hole in the second cover member 112 and is inserted into the photosensitive drum 12. The other end is configured to electrically connect to a grounding assembly (not shown) within the main assembly of the imaging device, thereby grounding the photosensitive drum 12. One end of the second grounding member 512 is electrically connected to the first grounding member 511, and the other end is configured to be electrically connected to or disconnected from the connecting member 53. Preferably, the first grounding member 511 is a conductive pin inserted into the photosensitive drum 12.

[0073] In this embodiment, the connecting member 53 has a first connecting end 56, a second connecting end 57, and a force receiving end 58. The first connecting end 56 is electrically connected to the developing roller shaft 221, and the second connecting end 57 is movable between a first position in contact with the power supply member 52 and a second position in contact with the grounding member 51. When the connecting member 53 / the second connecting end 57 is in the first position, the developing roller 22 has a first voltage value. When the connecting member 53 / the second connecting end 57 is in the second position, the developing roller 22 has a second voltage value. The absolute value of the first voltage value is greater than the absolute value of the second voltage value.

[0074] Specifically, the connecting member 53 includes a first connecting member 7 and a second connecting member 8. The first connecting member 7 is configured to support the developer roller shaft 221, and the first connecting end 56 is disposed on the first connecting member 7. The first connecting member 7 is mounted on one end of the developer unit frame 21, and the developer roller shaft 221 is rotatably supported on the first connecting member 7, forming an electrical connection between the first connecting member 7 and the developer roller shaft 221. The first connecting member 7 is formed of a conductive material. In some embodiments, the first connecting member 7 does not need to be configured as a component supporting the developer roller shaft 221. It can be other conductive components that can be electrically connected to the developer roller 22, such as a conductive metal sheet or conductive wire.

[0075] In some embodiments, the first conductive component 6 is electrically connected to an imaging device. A voltage between approximately -800 V and -1200 V, preferably approximately -900 V, is applied to the first conductive component 6. The first conductive component 6 transmits this voltage to the charging member 13. The charging member 13 contacts the photosensitive drum 12, ionizing the air in the gap between them and generating electrons that are distributed across the surface of the photosensitive drum 12. At this point, a voltage of approximately -600 V is applied to the surface of the photosensitive drum 12. The second connecting member 8 is electrically connected to the first connecting member 7 and is capable of moving under the influence of an external force. A second connecting end 57 and a force receiving end 58 are disposed on the second connecting member 8. The second connecting end 57 is configured to electrically connect to the grounding member 51 or the power supply 52.

[0076] When processing and executing the print instruction, the imaging device will emit a laser after receiving the print instruction, and irradiate certain printing areas on the surface of the photosensitive drum 12. After the printing area of ​​the photosensitive drum 12 is exposed, the voltage will increase to higher than -300V, preferably between about -200V and -100V. The second connection terminal 57 is connected to the power supply 52, and the developing roller 22 is applied with a developing voltage (such as -300V, the absolute value of the voltage is 300V) by the device. At this time, the developing roller 22 has a first voltage. At this time, the voltage on the developing roller 22 is lower than the voltage of the exposed position on the photosensitive drum 12 (such as -200V, the absolute value of the voltage is 200V). At this time, the direction of the electric field points to the developing roller, and the electric field force on the negatively charged toner points to the photosensitive drum 12. The toner can be transferred from the developing roller 22 to the exposed area of ​​the photosensitive drum 12, thereby forming a toner image. In the non-exposed area of ​​the photosensitive drum 12, the voltage remains below -300V (such as -600V) for a certain period of time. At this time, the direction of the electric field formed between this area and the developing roller 22 points to the photosensitive drum 12, and the electric field force on the negatively charged toner points to the developing roller 22. Therefore, the toner on the developing roller 22 in this area cannot be transferred to the non-exposed area of ​​the photosensitive drum 12.

[0077] After processing the print instruction (when performing a cleaning operation), the second connection terminal 57 is connected to the grounding member 51, and the voltage on the developing roller 22 is pulled down to 0V. At this time, the developing roller 22 has a second voltage, the absolute value of which is 0V. In this state, the developing roller 22 is in contact with the photosensitive drum 12. Even if the photosensitive drum 12 transfers charge to the developing roller 22, its potential remains at 0V because the developing roller 22 is grounded. Therefore, regardless of whether the surface of the photosensitive drum 12 is exposed, the voltage of the photosensitive drum 12 is ensured to be lower than that of the developing roller 22, and the direction of the electric field is always directed toward the photosensitive drum 12. The negatively charged toner is subjected to the electric field force directed toward the developing roller, and at this time, the toner will not be transferred from the surface of the developing roller 22 to the surface of the photosensitive drum 12.

[0078] The force receiving end 58 is used to receive a force from the force-applying member 20 of the imaging device, thereby causing at least a portion of the connecting member 53 (the second connecting member 8) to move between a first position and a second position. Specifically, the second connecting member 8 is capable of moving between the first position and the second position by receiving the force applied by the force-applying member 20 of the imaging device. Specifically, the second connecting member 8 is rotatably supported at one end of the processing cartridge 10 and is generally rod-shaped. The force receiving end 58 is provided at the lower end of the rod, and the second connecting end 57 extends from the upper side of the rod toward the side closer to the photosensitive unit and is capable of swinging with the swing of the second connecting member 8.

[0079] 15 to 19 , during an imaging operation of an imaging device, the force-applying member 20 applies a force to the second connecting member 8, causing the second connecting member 8 to rotate to a first position (the position shown in FIG18 ). During a non-imaging operation (cleaning operation), the force-applying member 20 applies a force to the second connecting member 8, causing the second connecting member 8 to rotate to a second position (the position shown in FIG19 ). Specifically, when the process cartridge 10 is in an imaging operation, the force-applying member 20 moves toward the photosensitive drum 12 and applies a force to the force-receiving end 58, causing the second connecting member 8 to rotate to a position in contact with the power supply member 52. When the process cartridge 10 is in a cleaning operation, the force-applying member 20 moves away from the photosensitive drum 12 and applies a force to the force-receiving end 58, causing the second connecting member 8 to rotate to a position in contact with the grounding member 51.

[0080] Optionally, the second connecting member 8 may further include a conductive portion and a non-conductive portion, wherein the conductive portion is used to electrically connect the developing roller 22 and the power supply member 52 or the grounding member 51 , for example, the force receiving end 58 may be configured to be a non-conductive material.

[0081] In some embodiments, the force receiving end 58 is configured to be able to move between a protruding position and a retracted position. In the protruding position (the position of the force receiving end 58 shown in Figure 17), the force receiving end 58 is able to receive the force of the force-applying member 20. In the retracted position (the position of the force receiving end 58 shown in Figure 15), the force receiving end 58 is closer to the inside of the frame than in the protruding position. This structural design can avoid interference with the imaging device when the processing box 10 is installed. Specifically, the processing box 10 also includes an elastic member 30, which is used to keep the force receiving end 58 in the retracted position. Preferably, one end of the elastic member 30 is connected to the second connecting member 8, and the other end is connected to the developing unit frame 21. When the second connecting member 8 is pressed by the pressing mechanism on the imaging device, the second connecting member 8 overcomes the force of the elastic member 30 and moves downward, and the force receiving end 58 moves from the retracted position to the protruding position.

[0082] In some embodiments, the force receiving end 58 can also be configured as a component that moves relative to the developing unit frame 21, such as a rocker arm or a free gravity block structure. This structure can move when it touches an obstacle, thereby avoiding interference from the obstacle. It can not only allow the processing box 10 to be smoothly installed in the device, but also meet the function of receiving the device force-applying component 20, so that at least a part of the connecting member (the second connecting member 8) can move between the first position and the second position. This structural scheme has a simpler structure.

[0083] Next, the cooperation process of the various components of the process cartridge 10 during the imaging operation and the cleaning operation of the process cartridge 10 will be described in detail with reference to FIG. 13 to FIG. 19 .

[0084] As shown in Figure 15, when the process cartridge 10 is installed in the image forming apparatus and the door cover is not closed, the pressing member 40 of the image forming apparatus is located above the process cartridge 10, the second connecting member 8 is not pressed by the pressing member 40, and the force receiving end 58 is in the retracted position. The second connecting member 8 is in the initial position where it is not connected to the power supply member 52 and the grounding member 51.

[0085] As shown in Figures 16 and 17 , after the door cover of the imaging device is closed, the pressing member 40 moves downward and presses the second connecting member 8. The second connecting member 8 overcomes the force of the elastic member 30 and moves downward. The force receiving end 58 moves from the retracted position to the protruding position. In this protruding position, the force receiving end 58 can receive the force applied by the force applying member 20. The second connecting member 8 is in an initial position, not electrically connected to the power supply member 52 and the grounding member 51. The first conductive component 6 contacts the imaging device and receives power. The charging roller 13 receives power and charges the photosensitive drum 12.

[0086] As shown in Figures 14 and 18, when the processing box 10 needs to perform an imaging operation, the force-applying member 20 moves toward the direction close to the photosensitive drum 12 and pushes the force receiving end 58, and the second connecting member 8 rotates to the first position. At this time, the second connecting member 8 is electrically connected to the power supply member 52. At this time, the developing roller 22 can receive the power of the developing electrode of the device (such as a voltage of -300V). After the photosensitive drum 12 is exposed, the voltage of the exposed position on its surface (such as -200V) is higher than the voltage of the developing roller 22. The direction of the electric field between the photosensitive drum 12 and the developing roller 22 points to the developing roller 22. At this time, the negatively charged carbon powder on the developing roller 22 is affected by the electric field force and the direction is directed to the photosensitive drum 12. Therefore, the negatively charged carbon powder on the surface of the developing roller 22 can be transferred to the exposed position on the surface of the photosensitive drum 12.

[0087] As shown in Figures 14 and 19, when the processing cartridge 10 needs to be cleaned, the force-applying member 20 moves away from the photosensitive drum 12 and pushes the force-receiving end 58, causing the second connecting member 8 to rotate to the second position. At this point, the second connecting member 8 is connected to the grounding member 51, and the developing roller 22 is grounded, with a voltage of 0V. At this point, even if the developing roller 22 contacts the surface of the photosensitive drum 12, part of the charge on the surface of the photosensitive drum 12 is conducted to the developing roller through the toner on the developing roller 22. Due to grounding, the charge is conducted away, and the voltage of the developing roller 22 is higher than the voltage on the photosensitive drum 12 (e.g., -600V). Therefore, the negatively charged toner on the developing roller 22 cannot be transferred to the surface of the photosensitive drum 12, thereby preventing unnecessary toner from attaching to the photosensitive drum 12 and contaminating the transfer belt. At the same time, there is no need to separate the photosensitive drum 12 and the developing roller 22, simplifying the complex separation mechanism.

[0088] During the process of switching the second connecting member 8 between the first position and the second position, the second connecting member 8 has a third position in which it is not electrically connected to the grounding member 51 and the power supply member 52. That is, the second connecting member 8 passes through the third position during the process of moving between the first position and the second position, but in some cases the time it stays in the third position is relatively short.

[0089] In some embodiments, when the process cartridge is not installed in the image forming apparatus, the second connecting member 8 is in any one of the first position, the second position, or the third position.

[0090] In some embodiments, when the connector 53 switches from the first position to the second position, the time during which the second connection end 57 is electrically connected to the grounding member 51 is longer than the time during which the second connection end 57 is electrically connected to the power supply 52 .

[0091] In some embodiments, the initial position of the second connecting member 8 may be the first position or the second position.

[0092] In some embodiments, the electrical switching assembly may be disposed on the driving end side of the process cartridge 10 .

[0093] In some embodiments, the process cartridge 10 further includes a voltage stabilizer that can maintain a stable voltage supplied to the developing roller 22 .

[0094] In some embodiments, the grounding member 51 does not have to be configured to be grounded, but is connected to a step-down unit or a step-up unit so that the voltage value on the developing roller 22 remains higher than the voltage on the surface of the photosensitive drum 12; in other words, the grounding member, the step-down unit or the step-up unit constitute a voltage regulating member.

[0095] In some embodiments, the voltage regulating component does not make the developing roller voltage zero. As long as the developing roller voltage is higher than the photosensitive drum voltage, the direction of the electric field is from the developing roller to the photosensitive drum, and the force on the toner is directed toward the developing roller.

[0096] In some embodiments, the voltage regulating component does not make the voltage of the developing roller zero, as long as the voltage supplied to the developing roller by the voltage regulating component can weaken the potential difference between the developing roller and the photosensitive drum, and the direction of the electric field is from the photosensitive drum to the developing roller, when the force applied to the toner is not sufficient to move the toner from the developing roller to the photosensitive drum.

[0097] In some embodiments, the electrical switching component can also be configured to control whether the photosensitive drum 12 is grounded to achieve a potential difference between the developing roller 22 and the photosensitive drum 12, as long as the charged toner cannot satisfy the electric field force to be transferred from the surface of the developing roller 22 to the photosensitive drum 12. More specifically, the electric field force to which the charged toner particles are subjected can overcome the frictional shear force between the developing roller 22 and the photosensitive drum 12, or the superposition of the electric field force to which the charged toner particles are subjected and the frictional shear force between the developing roller 22 and the photosensitive drum 12 cannot overcome the attraction (adhesion) between the charged toner particles and the developing roller, so that the toner cannot be transferred from the surface of the developing roller 22 to the surface of the photosensitive drum 12.

[0098] In some embodiments, the first connecting member 7 and the second connecting member 8 may be integrally formed.

[0099] In some embodiments, the voltage regulating component, the power supply component 52 and the connector 53 are not entirely made of conductive materials, for example, they have conductive parts and non-conductive parts, the conductive parts are used for conducting electricity, and the non-conductive parts are used to support or install the conductive parts.

[0100] This embodiment is introduced by taking negatively charged toner as an example. Those skilled in the art can obviously think of the improvement of the processing box when using positively charged toner based on the technical solution of this embodiment, as long as the force applied to the positively charged toner during non-imaging operation is directed toward the developing roller, or the force applied to the photosensitive drum is not sufficient to move the toner to the surface of the photosensitive drum.

[0101] Example 2

[0102] The process cartridge of this embodiment is further optimized based on the first embodiment. Its shape and structure are basically the same as those of the process cartridge 10 of the first embodiment. The same parts will not be described in detail here. The following mainly introduces the differences. The following parts that are the same as those of the first embodiment use the same reference numerals as those of the first embodiment.

[0103] As shown in Figures 20 to 27, in this embodiment, the processing box 10 also includes a retaining mechanism 50, which enables the connecting member 53 to maintain a stable electrical connection with the power supply member 52 during the imaging operation; during the cleaning operation, the connecting member 53 can maintain a stable electrical connection with the grounding member 51.

[0104] Specifically, the retaining mechanism 50 includes an engaging portion 531 provided on the connecting member 53, a first engaged portion 521 provided on the power supply member 52, and a second engaged portion 511 provided on the grounding member 51. When the connecting member 53 receives the force of the force-applying member 20 and moves to the first position, the engaging portion 531 abuts against the first engaged portion 521 and is retained, thereby maintaining an electrical connection between the connecting member 53 and the power supply member 52. At this time, regardless of whether the force-applying member 20 continues to apply force to the connecting member 53, the connecting member 53 and the power supply member 52 can maintain an electrical connection. Specifically, the first engaged portion 521 and the second engaged portion 511 can be configured in a stepped shape.

[0105] When the connector 53 / the second connector 8 receives the force of the force-applying member 20 and moves from the first position to the second position, the engaging portion 531 abuts against and is held by the second engaged portion 511, and the connector 53 / the second connector 8 remains electrically connected to the grounding member 51. At this time, regardless of whether the force-applying member 20 continues to apply force to the connector 53 / the second connector 8, the connector 53 / the second connector 8 and the grounding member 51 can remain electrically connected.

[0106] In the process cartridge 10 of this structure, the electrical connection between the connector 53 and the grounding member 51 and the power supply member 52 is more stable.

[0107] Specifically, the joining portion 531 is configured as a protruding structure, and at least one of the joining portion 531, the first joined portion 521, and the second joined portion 511 is an elastic component. More preferably, the joining portion 531 is an elastic conductor, such as a metal elastic sheet.

[0108] The process cartridge 10 having the above-described structure is compatible with a variety of imaging devices. In other words, the process cartridge 10 of this embodiment is compatible with the imaging device of Example 1 as well as another imaging device. The operation of the force-applying member 20 of the imaging device of this embodiment differs from that of the imaging device of Example 1, as described in detail below with reference to Figures 21 to 27.

[0109] As shown in FIG21 , the force applying member 20 includes a first force applying portion 201 and a second force applying portion 202. The first force applying portion 201 and the second force applying portion 202 are separated by a predetermined distance to form a spacing space 203. The force applying member 20 has three positions during operation, namely, a third position A, a fourth position B, and a fifth position C. The third position A is located between the fourth position B and the fifth position C, and the fourth position B is closer to the photosensitive drum 12 than the fifth position C. When the process cartridge 10 is installed in the main assembly of the image forming apparatus and the door cover is closed, the force receiving end 58 of the process cartridge 10 is inserted into the spacing space.

[0110] As shown in Figures 22 to 24, when the process cartridge 10 needs to perform an imaging operation, the force-applying member 20 moves to the fourth position B and applies a force to the force-receiving end 58. The second connecting member 8 rotates to the first position. At this time, the engaging portion 531 abuts and is held against the first engaged portion 521. The second connecting member 8 is electrically connected to the power supply 52, and the developing roller 22 can now receive power (e.g., a voltage of -300V). The force-applying member 20 then moves from the fourth position B to the third position A. The force-applying member 20 no longer applies a force to the force-receiving end 58. Since the engaging portion 531 abuts and is held against the first engaged portion 521, the connection between the connecting member 53 and the power supply remains stable. After the photosensitive drum 12 is exposed, the voltage at the exposed portion of its surface (e.g., -200V) is higher than the voltage of the developing roller 22. At this time, the negatively charged toner on the developing roller 22 can be transferred to the exposed portion on the surface of the photosensitive drum 12.

[0111] As shown in Figures 25 to 27, when the processing box 10 needs to perform a cleaning operation, the force member 20 moves from the third position to the fifth position C and pushes the force receiving end 58, and the second connecting member 8 rotates to the second position. During this process, the engaging portion 531 disengages from the first engaged portion 521, the engaging portion 531 abuts against and is held by the second engaged portion 511, and the second connecting member 8 is connected to the grounding member 51. Then, the force member 20 moves from the fifth position C to the third position A, and the force member 20 no longer applies force to the force receiving end 58. Since the engaging portion 531 abuts against and is held by the second engaged portion 511, the electrical connection between the connecting member 53 and the grounding member 51 remains stable.

[0112] Because the developing roller 22 is grounded and at a voltage of 0V, even if the developing roller 22 contacts the surface of the photosensitive drum 12, some of the charge on the surface of the photosensitive drum 12 is conducted to the developing roller via the toner on the developing roller 22. However, due to the grounding, the charge is conducted away. At this point, the voltage of the developing roller 22 is higher than the voltage on the photosensitive drum 12 (e.g., -600V). Therefore, the negatively charged toner on the developing roller 22 cannot be transferred to the surface of the photosensitive drum 12, thus preventing unnecessary toner from attaching to the photosensitive drum 12 and contaminating the transfer belt. Furthermore, the separation mechanism between the photosensitive drum 12 and the developing roller 22 is simplified by eliminating the need to separate the developing roller 22.

[0113] The shape of the above-mentioned retaining mechanism 50 is not limited by space and can be designed into various structural parts that can meet the above-mentioned characteristics, such as using a directional elastic deformation mechanism or a locking mechanism, both of which can meet the requirement of maintaining stable contact in one direction under the action of external force.

[0114] In some embodiments, the joining portion 531 is further provided with a clamping portion, and the first joined portion 521 and the second joined portion 511 are configured as clamping portions, and the joining portion 531 and the first joined portion 521 and the second joined portion 511 can be switched between a clamped state and a non-clamped state.

[0115] Example 3

[0116] The process cartridge of this embodiment is further optimized based on the first embodiment. Its shape and structure are basically the same as those of the process cartridge 10 of the first embodiment. The same parts will not be described in detail here. The following mainly introduces the differences. The following parts that are the same as those of the first embodiment use the same reference numerals as those of the first embodiment.

[0117] 28 to 31 , the main difference between the processing cartridge 10 of this embodiment and the processing cartridge 10 of embodiment 1 is that the power supply member 52 is not in direct contact with the main component of the imaging device but is electrically connected to the first conductive component 6 .

[0118] In this embodiment, the processing box is further provided with a step-down unit 101 . Specifically, the step-down unit 101 is a resistor connected to the circuit, which can reduce the voltage applied to the power supply 52 relative to the voltage of the first conductive component 6 .

[0119] In some embodiments, the process cartridge further includes a voltage stabilizer 9 that can stabilize the voltage supplied to the developing roller 22 .

[0120] As shown in the figure, in some embodiments, the step-down unit 101 and the voltage stabilizer 9 are integrated on a PCB board 60, and the PCB board 60 has a power input terminal 601, a ground terminal 602 and a power output terminal 603, wherein the power input terminal 601 is electrically connected to the first conductive component 6, the ground terminal 602 is electrically connected to the grounding member 51, and the power output terminal 603 is electrically connected to the power supply component 52.

[0121] The process cartridge 10 of this structure does not need to receive power independently from the main assembly of the imaging device, and can be applied to more imaging devices and achieve universal use. In addition, the structure can be simplified to avoid contact instability.

[0122] When the second connecting member 8 moves to the first position, the second connecting member 8 is electrically connected to the power supply member 52 , and the developing roller 22 can receive power lower than the voltage of the charging roller 13 (eg, a voltage of −300 V).

[0123] When the second connection member 8 moves to the second position, the second connection member 8 is electrically connected to the ground member 51 .

[0124] The technical solution of this embodiment can be applied to both Embodiment 1 and Embodiment 2.

[0125] Example 4

[0126] The processing box of this embodiment is further optimized on the basis of the above embodiment. Its shape and structure are basically the same as those of the processing box of the above embodiment. The same parts will not be repeated here. The following mainly introduces the differences. The following parts that are the same as those in the above embodiment will use the numbers of the above embodiment.

[0127] As shown in Figures 32 and 33, the connecting member 53 of this embodiment is always electrically connected to the power supply member 52, and the power supply member 52 is electrically connected to the imaging device, that is, the developing roller 22 is always electrically connected to the power supply member 52.

[0128] Specifically, at least a portion of the connector 53 (which may be the second connector 8) is movable between a first position in which it is electrically connected to the power supply 52 and a second position in which it is electrically connected to the voltage regulating member. In the first position, the connector 53 is electrically connected to the power supply 52. ​​In the second position, the connector 53 is electrically connected to both the power supply 52 and the voltage regulating member 51. Specifically, the voltage regulating member is the grounding member 51.

[0129] As shown in Figure 32, when the connector 53 / the second connector 8 is disconnected from the grounding member 51 (the connector / the second connector is in the first position), the connector 53 is electrically connected to the power supply member 52, and a first voltage (such as -200V) is applied to the developing roller 22. At this time, the developing roller 22 is in contact with the photosensitive drum 12, and the carbon powder on the developing roller 22 can be transferred to the exposure area of ​​the photosensitive drum 12 under the action of the electric field force.

[0130] As shown in Figure 33, when the connector 53 / the second connector 8 is electrically connected to the grounding member 51 (the connector / the second connector is in the second position), the connector 53 / the second connector 8 is always electrically connected to the power supply member 52, and the developing roller 22 is grounded. At this time, the voltage applied to the developing roller 22 is the second voltage (such as 0V or -50V), and the absolute value of the second voltage (such as 0V or -50V) is smaller than the absolute value of the first voltage (such as -200V); at this time, the electric field force applied to the toner is toward the developing roller 22, or the electric field force is toward the photosensitive drum 12 but is not enough to cause the toner to move from the surface of the developing roller 22 to the photosensitive drum 12.

[0131] The process cartridge with the above-described structure solves the problem of toner being transferred to the surface of the photosensitive drum 12 when the developing roller 22 and photosensitive drum 12 are not separated during non-imaging operations (such as cleaning operations), causing toner contamination of the photosensitive drum 12, the transfer belt, and other components. Furthermore, because the connector 53 / second connector 8 is always electrically connected to the power supply 52, this embodiment eliminates the disconnection period during the voltage switching process for the developing roller 12. This prevents the developer roller from experiencing transient changes in the electric field caused by the disconnection interval between the connecting member 53 and the switching between the two positions, thereby preventing toner from the surface of the developing roller 22 from being transferred to the surface of the photosensitive drum 12. Furthermore, it also prevents wear between the connector 53 / second connector 8 and the power supply 52 caused by frequent disconnection and reconnection operations, while also improving the stability of the electrical connection between them.

[0132] Example 5

[0133] The processing box of this embodiment is further optimized on the basis of the above embodiments 1-4. Its shape and structure are basically the same as those of the processing boxes of the above embodiments. The same parts will not be repeated here. The following mainly introduces the differences. The following parts that are the same as those of the above embodiments will use the numbers of the above embodiments.

[0134] As shown in Figures 34 to 36, unlike the above-mentioned embodiment, at least a portion of the power supply member 52a of this embodiment is configured to move relative to the connecting member 53a. Specifically, at least a portion of the power supply member 52a can move between a position electrically connected to the connecting member 53a and a position not connected. Before the imaging operation, the power supply member 52a and the connecting member 53a can be in a state of not being electrically connected (as shown in Figure 34); during the imaging operation, the power supply member 52a is electrically connected to the connecting member 53a (as shown in Figure 35) to be able to supply power to the developing roller; during the non-imaging operation (for example, during the cleaning operation), the power supply member 52a is electrically disconnected from the connecting member 53a, and the power supply member 52a stops transmitting power to the developing roller 22; the connecting member 53a is electrically connected to the grounding member 51 (as shown in Figure 36).

[0135] In some embodiments, the power supply member 52a and the connection member 53a are always electrically connected.

[0136] Example 6

[0137] The processing box of this embodiment is further optimized on the basis of the above-mentioned embodiments 1-5. Its shape and structure are basically the same as those of the processing boxes of the above-mentioned embodiments. The same parts will not be repeated here. The following mainly introduces the differences. The following parts that are the same as those of the above-mentioned embodiments will use the numbers of the above-mentioned embodiments.

[0138] As shown in Figures 37 and 38 , unlike the above-described embodiment, at least a portion of the grounding member 51b of this embodiment is movable. Specifically, at least a portion of the grounding member 51b is movable between a position in which it is electrically connected to the connector 53b and a position in which it is not electrically connected. During image formation operation, the grounding member 51b is not electrically connected to the connector 53b (as shown in Figure 37 ). During non-image formation operation (e.g., during cleaning operation), the grounding member 51b is electrically connected to the connector 53b (as shown in Figure 38 ), and the developing roller 22 is grounded.

[0139] In some embodiments, at least a portion of the grounding member and at least a portion of the power supply member are configured to be movable relative to the connecting member.

[0140] In some embodiments, at least a portion of the ground member, at least a portion of the power supply member, and at least a portion of the connection member are configured to be movable.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. In order to facilitate the distinction between different components, the present invention introduces terms such as "first" and "second", where the terms such as "first" and "second" are not to be understood as limitations on their quantity. According to the description in the specification, the components described by "first" and "second" can be one or more.

[0142] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process cartridge detachably mountable in a main assembly of an electrophotographic image forming apparatus provided with an electric component, the process cartridge comprising a photosensitive drum, a developing roller, and a charging component for charging the photosensitive drum; It is characterized by: The processing box also includes: a power supply member capable of contacting the power component to receive power, the power supply member being capable of supplying power to the developing roller; A grounding member capable of switching between a state of being electrically connected to the developing roller and a state of being not electrically connected to the developing roller, wherein when the developing roller is not electrically connected to the grounding member, the developing roller has a first voltage value; when the developing roller is electrically connected to the grounding member, the developing roller has a second voltage value; and the absolute value of the first voltage value is greater than the absolute value of the second voltage value.

2. The process cartridge according to claim 1, wherein The processing box also includes a connecting part, which can be electrically connected to the developing roller, and the connecting part can be electrically connected to the power supply part or can be switched between an electrically connected state and an electrically non-connected state with the power supply part; the connecting part can be switched between a state of being electrically connected to the grounding member and a state of being electrically non-connected.

3. The process cartridge according to claim 2, wherein: At least a portion of the connector is movable between a first position electrically connected to the power supply and a second position electrically connected to the ground member.

4. The process cartridge according to claim 2, wherein: The developing roller includes a developing roller shaft and a first main body supported on the developing roller shaft; the connecting member has a first connecting end and a second connecting end, the first connecting end is electrically connected to the developing roller shaft, and the second connecting end is capable of moving between a first position in contact with the power supply member and a second position in contact with the grounding member; when the second connecting end is in the first position, the developing roller has a first voltage value, and when the second connecting end is in the second position, the developing roller has a second voltage value, and the absolute value of the first voltage value is greater than the absolute value of the second voltage value.

5. A process cartridge detachably mountable in a main assembly of an electrophotographic image forming apparatus provided with an electric component, the process cartridge comprising a photosensitive drum, a developing roller, and a charging component for charging the photosensitive drum; It is characterized by: The processing box also includes: a power supply member capable of contacting the power component to receive power; a connecting member capable of being electrically connected to the developing roller, wherein the connecting member is capable of being electrically connected to the power supply member or is capable of switching between an electrically connected state and an electrically disconnected state with the power supply member; The grounding member, at least a portion of the connector can be switched between a state of being electrically connected to and a state of being not electrically connected to the grounding member.

6. The process cartridge according to claim 5, wherein: At least a portion of the connector is movable between a first position electrically connected to the power supply and a second position electrically connected to the ground member.

7. The process cartridge according to claim 6, wherein: When in the first position, the connecting member is electrically connected to the power supply member; when in the second position, the connecting member is electrically connected to the power supply member and the grounding member at the same time.

8. The process cartridge according to claim 6, wherein: The connecting member also includes a force receiving end, which is capable of moving between a protruding position and a retracted position. In the protruding position, the force receiving end is capable of receiving the force of the force-applying member of the imaging device so that at least a portion of the connecting member moves between the first position and the second position.

9. The process cartridge according to claim 6, wherein: The process cartridge further includes an elastic member configured to maintain the force receiving end in a retracted position.

10. The process cartridge according to any one of claims 2 to 8, wherein: At least a portion of the ground member and / or the power supply member is movable between a position in which the ground member is electrically connected to the connection member and a position in which the ground member is not electrically connected to the connection member.

11. The process cartridge according to any one of claims 2 to 8, wherein: The process cartridge further includes a holding mechanism capable of maintaining the connection member electrically connected to the power supply member during an image forming operation and maintaining the connection member electrically connected to the ground member during a cleaning operation.

12. The process cartridge according to claim 11, wherein The processing box also includes a first conductive component arranged on the upper side of the processing box, which is in contact with the electronic photographic imaging device and receives power; the charging component is a charging roller, which is electrically connected to the first conductive component.

Images