CN110609459B - Process cartridge - Google Patents
Process cartridge Download PDFInfo
- Publication number
- CN110609459B CN110609459B CN201910926048.8A CN201910926048A CN110609459B CN 110609459 B CN110609459 B CN 110609459B CN 201910926048 A CN201910926048 A CN 201910926048A CN 110609459 B CN110609459 B CN 110609459B
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- China
- Prior art keywords
- force receiving
- force
- process cartridge
- receiving member
- electrical communication
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- 238000000034 method Methods 0.000 title claims abstract description 93
- 230000008569 process Effects 0.000 title claims abstract description 91
- 238000004891 communication Methods 0.000 claims abstract description 84
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims 5
- 238000000926 separation method Methods 0.000 abstract description 11
- 238000007639 printing Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0815—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer handling means after the developing zone and before the supply, e.g. developer recovering roller
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1642—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements for connecting the different parts of the apparatus
- G03G21/1652—Electrical connection means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
- G03G21/1676—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the developer unit
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1803—Arrangements or disposition of the complete process cartridge or parts thereof
- G03G21/1814—Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1857—Means for handling the process cartridge in the apparatus body for transmitting mechanical drive power to the process cartridge, drive mechanisms, gears, couplings, braking mechanisms
- G03G21/186—Axial couplings
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1867—Means for handling the process cartridge in the apparatus body for electrically connecting the process cartridge to the apparatus, electrical connectors, power supply
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
The invention provides a process cartridge, the process cartridge includes a developing roller; a first force receiving assembly; developing electrodes; a switching device including a second force receiving assembly including a second force receiving member, a first electrical communication member connected with the second force receiving member and the developing roller, and a second electrical communication member; the second electrical communication member is electrically connected with the 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 a second position and a third position; in a state where the process cartridge is loaded into the image forming apparatus, the second force receiving member is located at the second position during the image forming operation, the developing roller is charged, and the second force receiving member is located at the third position during the non-image forming operation, the developing roller is not charged, the process cartridge having this structure prevents the excessive developer on the developing roller from adhering to the photosensitive drum during the non-image forming operation without employing the separation of the developing roller from the photosensitive drum, and can ensure the printing quality and the structural stability.
Description
[ Field of technology ]
The present invention relates to a process cartridge for an electrophotographic image forming apparatus, and more particularly, to a process cartridge with a switching device.
[ Background Art ]
In an image forming apparatus such as a laser printer, a copier, a facsimile machine, etc. which forms an image by electrophotography, there is generally a process cartridge which is detachable from the image forming apparatus. The existing process cartridge mainly includes: an integral process cartridge integrating a photosensitive drum unit and a developing unit together, and a split process cartridge including only the photosensitive drum unit or the developing unit.
In the integral process cartridge, the photosensitive drum unit and the developing unit are generally connected to each other by being rotatably movable. The photosensitive drum unit comprises a photosensitive drum unit frame, a photosensitive drum rotatably supported by the photosensitive drum unit frame, a charging roller, a cleaning scraper, a waste powder bin and the like, and the developing unit comprises a developing unit frame, a developing roller rotatably supported by the developing unit frame, a powder bin, a powder feeding roller, a layer thickness regulating device and the like. During an image forming operation, the photosensitive drum and the developing roller are brought into contact with each other by the force of a spring located between the developing unit and the photosensitive unit, and in the case where the image forming apparatus employs a developing method in which the developing roller is placed in contact with the photosensitive drum to develop a latent image on the photosensitive drum, the developing roller is kept pressed against the outer peripheral surface of the photosensitive drum. During the non-image forming operation, the surface of the photosensitive drum is attached with an excessive amount of developer due to the charging of the developing roller, thereby causing a problem of poor printing quality.
In order to prevent the above-described problems, there is an image forming apparatus including a housing chamber provided with a positioning portion and a plurality of action portions and the like in the housing chamber of the image forming apparatus, wherein the action portions are distributed at a plurality of portions of the image forming apparatus for acting on the process cartridge and having a restraining or fixing action on the process cartridge when the process cartridge is loaded into the image forming apparatus, such as a first force applying portion located above the process cartridge after the process cartridge is loaded into the image forming apparatus, a convex portion of a base of the image forming apparatus, a cross member of the base, and the like, and a rear positioning portion of the image forming apparatus for mounting the process cartridge in place in the image forming apparatus. In general, a process cartridge is mounted on a cartridge holder of an image forming apparatus and is pushed into an image forming apparatus accommodating chamber, at this time, a positioning portion of the process cartridge with respect to the image forming apparatus has a certain moving distance in a direction perpendicular to the cartridge holder, after a door of the image forming apparatus is closed, the process cartridge can fall into the positioning portion of the image forming apparatus under the closing action of the door, a first force application portion provided in the image forming apparatus, a convex portion of a base of the image forming apparatus, a cross beam of the base, and the like have an acting force on the process cartridge, and after the door is opened, the process cartridge follows the cartridge holder to be separated from the positioning portion, and the process cartridge is not acted by the acting force of an acting portion of the image forming apparatus. The image forming apparatus further has a separation mechanism operable on the process cartridge, the separation mechanism being provided with a second urging portion.
A conventional process cartridge is provided with a first force receiving member and a separation force receiving member on a developing frame, the separation force receiving member being capable of receiving a force from the first force receiving member, projecting from a retracted position to a projecting position, and driving the developing unit frame to deflect relative to a photosensitive unit by a force of a second force applying portion of a separation mechanism of an image forming apparatus, thereby separating a developing roller from a photosensitive drum; however, the separation of the photosensitive drum and the developing roller of the process cartridge occurs during the non-imaging operation, and the spring between the developing unit and the photosensitive unit is compressed in the separation process, so that the separation of the developing roller and the photosensitive drum needs to be delayed to a certain extent due to overcoming the elastic force of the spring, and the problem that the developing roller attaches excessive developer to the surface of the photosensitive drum still exists.
[ Invention ]
The present invention provides a novel integrated process cartridge which can prevent developer from adhering to the surface of a photosensitive drum during a non-image forming operation by controlling the process cartridge such that a developing roller is charged during the image forming operation and the developing roller is not charged during the non-image forming operation.
In order to achieve the above object, the present invention provides a process cartridge detachably mountable to an image forming apparatus including a first urging portion and a second urging portion; the process cartridge includes: the device comprises a developing unit and a photosensitive unit, wherein the photosensitive unit comprises a photosensitive unit frame and a photosensitive drum, and the developing unit comprises a developing unit frame and a developing roller; a first force receiving member located at a first end of the process cartridge in a longitudinal direction thereof for receiving a force from the first force applying portion; a developing electrode located at a second end of the process cartridge in a length direction; the process cartridge further includes a switching device at a first end of the process cartridge, the switching device including a second force receiving assembly, a first electrical communication member, and a second electrical communication member, the second force receiving assembly including a second force receiving member and a first resilient member, the first electrical communication member being connected to the second force receiving member and the developer roller; the second electrical communication member is connected with the 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 a second position and a third position; in a state in which the process cartridge is loaded into the image forming apparatus, the second force receiving member is located at the second position during the image forming operation, the first electric communicating member is in electric contact with the second electric communicating member, the developing roller is charged, the second force receiving member is located at the third position during the non-image forming operation, the first electric communicating member is not in contact with the second electric communicating member, and the developing roller is not charged.
The process cartridge having the above-described structure, after the process cartridge is loaded into the image forming apparatus, the second force receiving member is located at the second position during the image forming operation, the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is charged; during non-imaging operation, the second force receiving member moves from the second position to the third position, the first electrical communication member is disconnected from the second electrical communication member, and the developing roller is not charged; when the image forming operation is continued, the second force receiving member returns from the third position to the second position, the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is charged; this makes it possible to charge the developing roller during the image forming operation, to not charge it during the non-image forming operation, and to secure the printing quality without attaching an excessive developer to the surface of the photosensitive drum during the non-image forming operation.
Further, the second force receiving member includes a first force receiving portion for receiving a force of the first force receiving assembly to position the second force receiving member in the second position, a second force receiving portion for receiving a force of the second force applying portion to move the second force receiving member from the second position to the third position with respect to the developing unit frame, a first mounting portion, and a supported portion.
Further, the developing unit further includes a bearing having a supporting portion, the supported portion of the second force receiving member being sleeved on the supporting portion with a space therebetween.
The processing box with the structure has the advantages that the second force receiving component is spaced from the bearing, so that a space is provided for the movement of the second force receiving component relative to the bearing, and the second force receiving component can deflect relative to the bearing when the second force receiving component is acted by the force of the second force application part, so that the developing unit frame is not driven to rotate.
Further, the supported part is a U-shaped groove, the corresponding supporting part is a rod piece, and the U-shaped groove is sleeved on the rod piece.
The process cartridge having the above-described structure, the support portion of which is provided as a "U" shaped groove such that the second force receiving member is movable in a plurality of directions with respect to the lever.
Further, the U-shaped groove comprises a first lug and a second lug, and a gap is arranged between the first lug and the bearing in the moving direction of the second force application part, so that the second force receiving component deflects relative to the bearing under the action of the second force application part.
The processing box with the structure has the advantages that the first lug of the U-shaped groove of the second force receiving component is separated from the bearing in the moving direction of the second force application part, a space is provided for the second force receiving component to move relative to the bearing, the second force receiving component is deflected relative to the bearing under the force of the second force application part and does not drive the developing unit frame to move, the first electric communication component is disconnected from the second electric communication component, and the developing roller is not electrified.
Further, the first electrical communication member is located on the developing unit and includes a first connecting portion provided on the first mounting portion of the second force receiving member and moving with the movement of the second force receiving member, and a second connecting portion in electrical contact with the developing roller.
The process cartridge having the above-described structure, the first connection portion of the first electrical communication member moves with the movement of the second force receiving member, the first electrical communication member is in electrical contact with the second electrical communication member when the first electrical communication member is in the second position, and the first electrical communication member is not in contact with the second electrical communication member when the first electrical communication member is in the third position.
Further, the first connecting portion is a "U" shaped extension arm, the corresponding first mounting portion includes a mounting hole and a mounting slot, and the "U" shaped extension arm is disposed through the mounting hole and has a portion located in the mounting slot.
The process cartridge having the above-described structure, the "U" shaped extension arm may be stably mounted on the first mounting portion of the second force receiving member and move with the movement of the second force receiving member.
Further, the second electrical communication member is located on the developing unit and has a third connecting portion electrically connected to the developing electrode and a fourth connecting portion at least a portion of which contacts the "U" shaped extension arm when the second force receiving member is located at the second position.
Further, the developing unit further includes a gear protecting cover having a second mounting portion, and the fourth connecting portion is mounted at the second mounting portion.
Further, the fourth connecting portion is a hook portion, the corresponding second mounting portion is a concave portion, and the hook portion is sleeved in the concave portion.
The processing box with the structure is characterized in that the hook part is sleeved on the concave part, so that a part of the hook part faces the second force receiving component, and the hook part is contacted with the U-shaped extension arm when the second force receiving component is positioned at the second position.
Further, the first elastic member is a first compression spring.
The processing box uses the compression spring as an elastic component, has good elastic effect, simple structure and low production cost.
Further, the first electrical communication member and the second electrical communication member are made of conductive wires or conductive sheets or conductive wires.
The processing box has the advantages that the first electric communication component and the second electric communication component are made of conductive wires or conductive sheets or conductive wires, the conductive effect is good, the structure is simple, and the production cost is low.
Further, when the process cartridge is mounted in the image forming apparatus, the first force receiving member receives a force from the first force applying portion and presses against the second force receiving member to rotate the second force receiving member from the first position to the second position relative to the developing unit frame, the first electrical communication member being in electrical contact with the second electrical communication member; when the second force receiving member receives the force from the second force applying portion, the second force receiving member moves from the second position to the third position with respect to the developing unit frame, the first electrical communication member is separated from the second electrical communication member, and the developing roller is not charged; when the second force receiving member receives no force from the second force applying portion during the image forming operation, the second force receiving member returns from the third position to the second position, and the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is charged.
The process cartridge having the above-described structure, after the process cartridge is loaded into the image forming apparatus, the second force receiving member is located at the second position during the image forming operation, the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is charged; during non-imaging operation, the second force receiving member moves from the second position to the third position, the first electrical communication member is disconnected from the second electrical communication member, and the developing roller is not charged; when the image forming operation is continued, the second force receiving member returns from the third position to the second position, the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is charged; this makes it possible to realize a developing roller that is charged during an image forming operation, is uncharged during a non-image forming operation, does not attach an excessive developer to the surface of the photosensitive drum during the non-image forming operation, ensures print quality, and is simple in structure.
[ Description of the drawings ]
Fig. 1 is a perspective view of a process cartridge according to an embodiment;
FIG. 2 is an enlarged view of part of A in FIG. 1;
FIG. 3 is a partial exploded view of a process cartridge according to an embodiment;
FIG. 4 is an enlarged view of part of B in FIG. 3;
FIG. 5 is a schematic illustration of the construction of a first force receiving assembly, a second force receiving assembly and a bearing of an embodiment;
FIG. 6 is a schematic view showing the structure of a switching device, a first force receiving member, a developing roller, and a developing electrode according to the embodiment;
FIG. 7 is a positional relationship diagram of the second force receiving member, the first electrical communication member, the second electrical communication member of the process cartridge before being loaded into the image forming apparatus;
FIG. 8 is an enlarged view of part of C in FIG. 7;
Fig. 9 is a positional relationship diagram of the second force receiving member, the first electrical communication member, and the second electrical communication member when the first force receiving member of the first embodiment receives the force of the first urging portion;
FIG. 10 is an enlarged view of part of D of FIG. 9;
Fig. 11 is a positional relationship diagram of the second force receiving member, the first electrical communication member, and the second electrical communication member when the second force receiving member of the first embodiment receives the force of the second urging portion;
Fig. 12 is a partial enlarged view of E in fig. 11.
The following describes the embodiments of the present invention in further detail with reference to the drawings.
[ Detailed description ] of the invention
Example 1
As shown in fig. 1 to 3, the process cartridge 100 includes a photosensitive unit 1, a developing unit 2, a first end cap 3, and a second end cap 4, the first end cap 3 being mounted at a first end 5 of the process cartridge 100 in the longitudinal direction, the second end cap 4 being mounted at a second end 6 of the process cartridge 100 in the longitudinal direction, wherein the first end 5 and the second end 6 are opposite in the longitudinal direction of the process cartridge 100. The photosensitive unit 1 includes a photosensitive unit frame 11, a photosensitive drum 12, a charging roller (not shown), a waste toner hopper 13, and the like. The developing unit 2 includes a developing unit frame 21, a developing roller 22, a powder feeding roller (not shown), a powder hopper 23, a developing electrode 24, and the like, wherein the powder hopper 23 has a first end wall 231 and a second end wall 232 in the longitudinal direction of the process cartridge 100, the first end wall 231 being adjacent to the first end cover 3, the second end wall 232 being adjacent to the second end cover 4; the developing electrode 24 is fitted on the second end wall 232 and has a portion exposed outside the process cartridge 100 for electrical connection with the image forming apparatus. The photosensitive unit 1 and the developing unit 2 are rotatably movably connected together, and the photosensitive drum 12 and the developing roller 22 are in a state of contact with each other by a force of a spring (not shown) located between the developing unit 2 and the photosensitive unit 1. The above-described structure of the process cartridge 100 is substantially the same as that of the process cartridge of the related art, and will not be described again here.
As shown in fig. 2 to 6, the developing unit 2 further includes a switching device 25, a first force receiving assembly 26, a bearing 27, and a gear protecting cover 28, wherein the switching device 25 includes a first electrical communication member 251, a second electrical communication member 252, and a second force receiving assembly 253, and the second force receiving assembly 253 includes a second force receiving member 2531 and a first elastic member 2532. In this embodiment the first force receiving assembly 26, the second force receiving assembly 253, the bearing 27 and the gear cover 28 are all located at the first end 5 of the cartridge 100 in the length direction.
As shown in fig. 3 to 5, the bearing 27 has a plurality of guide holes 271, a plurality of first bosses (not shown) on the corresponding first end wall 231 of the hopper 23, the bearing 27 is fitted on the first end wall 231 of the hopper 23 by the guide holes 231 being fitted with the first bosses (not shown) on the first end wall 231 of the hopper 23 for supporting the developing roller 12, the feeding roller, and the like, and the bearing 27 has a second mounting portion 272 for mounting the first force receiving assembly 26, a third mounting portion 272 for mounting the first elastic member 2532, and a supporting portion, the third mounting portion being a mounting boss (not shown) in this embodiment. The support portion is for supporting the second force receiving member 2531 such that the second force receiving member 2531 is rotatable relative to the developing unit frame 21, and the support portion of the bearing 27 is a lever 273 in this embodiment. A gear protecting cover 28 is fitted to a side of the bearing 27 near the process cartridge first end cover 3 for covering the developing unit driving gear and the like, and a notch portion 281 is provided on the gear protecting cover 28 so that the second force receiving member 2531 of the process cartridge 100 can be positioned in the notch portion 281 before being loaded into the image forming apparatus.
As shown in fig. 5,6, 9, the first force receiving assembly 26 includes a first force receiving member 261 and a second resilient member, which in this embodiment is a second compression spring 262. The first force receiving member 261 includes a third force receiving portion 2611, a pressing portion 2612, wherein the third force receiving portion 2611 is configured to receive a force from the image forming apparatus first urging portion 201, the pressing portion 2612 is pressed against the second force receiving member 2531, and the second compression spring 262 is mounted on the first force receiving member 261 and the first force receiving member 261 has an elastic force.
As shown in fig. 4 to 10, in the present embodiment, the switching device 25 includes a first electrical communication member 251, a second electrical communication member 252, and a second force receiving assembly 253, and the second force receiving assembly 253 includes a second force receiving member 2531 and a first elastic member. In the present embodiment, the first elastic member is a first compression spring 2532, one end of the first compression spring 2532 is mounted on a mounting projection (not shown) of the bearing 27, and the other end is pressed against the second force receiving member 2531 and has an elastic force to the second force receiving member 2531, so that the second force receiving member 2531 is positioned in the notch portion 281 of the gear cover 28 with respect to the developing unit frame 21 before the process cartridge 100 is loaded into the image forming apparatus. In the moving direction a of the second force applying portion 202 of the image forming apparatus, the second force receiving member 2531 has a front side surface 25311 and a rear side surface 25312, located forward of the moving direction a of the second force applying portion is a front side surface 25311, located rearward of the moving direction a of the second force applying portion 202 is a rear side surface 25312, and the front side surface 25311 and the rear side surface 25312 of the second force receiving member 2531 have a space between the bearing 27, which provides a moving space for the second force receiving member 2531 to deflect against the bearing 27. The second force receiving member 2531 includes a first force receiving portion 25313, a second force receiving portion 25314, a first mounting portion 25315, and a supported portion, wherein the first force receiving portion 25313 is of a cam structure, and is configured to rotate the second force receiving member 2531 relative to the developing unit frame 21 under the pressing force of the pressing portion 2612 of the first force receiving member 261, so that the second force receiving member 2531 protrudes from the developing unit frame 21 to the outside of the process cartridge 100; the second force receiving portion 25314 is located above the first force receiving portion 25313 and on the opposite side of the first force receiving portion 25313 when the process cartridge 100 is mounted to the image forming apparatus, the first force receiving portion 25313 is located on the front side of the second force receiving member 2531, and the second force receiving portion 25314 is located on the rear side of the second force receiving member 2531 in the moving direction of the second force applying portion 202; the second force receiving portion 25314 is configured to receive a force from the imaging apparatus second force applying portion 202, such that the second force receiving member 2531 is deflected with respect to the bearing 27. In the present embodiment, the supported portion is a "U" shaped groove 25316, the "U" shaped groove 25316 is sleeved on the lever 273, so that the second force receiving member 2531 is rotatable around the lever 273 relative to the developing unit frame 21; the "U" shaped groove 25316 has a first projection 253161 and a second projection 253162, wherein the rear side of the first projection 253161 is spaced from the bearing 27 in the moving direction a of the second force application portion 202, and the second force receiving portion 25314 of the second force receiving member 2531 is deflectable relative to the bearing 27 when receiving the force of the second force application portion 202, but the bearing 27 is not deflectable.
As shown in fig. 2-6, 9, 10, the first and second electrical communication members may be made of conductive wires or sheets or wires, in this embodiment the first electrical communication member 251 is made of conductive wires and has first and second connection portions 2512, the first connection portion being a "U" shaped extension arm 2511, the first mounting portion 25315 of the corresponding first force-receiving member 2531 including a mounting hole 253151 and a mounting slot 253152, the "U" shaped extension arm 2511 being mounted through the mounting hole 253151 of the second force-receiving member 2531 and having a portion located within the mounting slot 253152 such that the "U" shaped extension arm 2511 is rotatable with rotation of the second force-receiving member 2531, the "U" shaped extension arm 2511 having a portion exposed on the rear side 25312 of the second separation force-receiving member 2531; the second electrical communication member 252 is made of an electrically conductive wire and is located on the developing unit frame 21, having a third connection portion 2521 and a fourth connection portion; a second boss 2321 on the second end wall 232 of the powder bin 23 and a third boss 2331 on the powder bin side wall 233 between the first end wall 231 and the second end wall 232, a portion of the second electrical communication member 252 being supported by the third boss 2331; the third connection portion 2521 is wound around the second boss 2321 of the second end wall and is in electrical contact with the developing electrode 24, the fourth connection portion is a hook portion 2522, the hook portion 2522 is hung in the recess 282 of the gear protecting cover 28, and a portion of the hook portion 2522 faces the rear side surface 25312 of the second force receiving member 2531, and the hook portion 2522 is in electrical contact with the "U" shaped extension arm 2511 when the second force receiving member 2531 is in the second position.
Next, referring to fig. 4 to 12, the charging process of the developing roller 21 of the process cartridge 100 during the image forming operation and during the non-image forming operation of the process cartridge 100 will be described in detail.
Fig. 7 is a diagram showing the positional relationship of the second force receiving member 2531, the first electrically conductive member 251, and the second electrically conductive member 252 before the process cartridge is loaded into the image forming apparatus, wherein the second force receiving member 2531 is positioned in the notched portion 281 of the gear protecting cover 28, the "U" shaped extension arm of the first electrically conductive member may or may not contact the hook portion of the second electrically conductive member at this time, and the "U" shaped extension arm 2511 of the first electrically conductive member 251 is not in contact with the hook portion 2522 of the second electrically conductive member 252, as shown in fig. 7 and 8, and the position where the second force receiving member 2531 is positioned with respect to the developing frame 21 will be the first position in this embodiment. Fig. 9 is a diagram showing the positional relationship among the second force receiving member 2531, the first electrical communication member 251 and the second electrical communication member 252 when the first force receiving member 2531 receives the force of the first force applying portion 201, in which the second force receiving portion 25314 protrudes beyond the outer surface of the developing frame 21, and the "U" shaped extension arm 2511 of the first electrical communication member 251 is in electrical contact with the hook portion 2522 of the second electrical communication member 252, in which case the position of the second force receiving member 2531 relative to the developing frame 21 is the second position in this embodiment, as shown in fig. 9 and 10. Fig. 11 is a diagram showing the positional relationship among the second force receiving member 2531, the first electrical communication member 251, and the second electrical communication member 252 when the second force receiving member 2531 receives the force from the second force application portion 202, in which the second force receiving member 2531 is deflected relative to the bearing 27, and the "U" shaped extension arm 2511 of the first electrical communication member 251 is not in contact with the hook portion 2522 of the second electrical communication member 252, and in this embodiment, the position where the second force receiving member 2531 is located relative to the developing frame 21 is the third position, as shown in fig. 11 and 12.
As shown in fig. 4 to 12, the second force receiving member 2531 is positioned at the first position by the elastic force of the first compression spring 2532 before the process cartridge 100 is loaded into the image forming apparatus. After the process cartridge 100 is loaded into the image forming apparatus, the first force receiving member 261 receives the urging force of the first urging portion 201, and the urging portion 2612 of the first force receiving member 261 urges against the first urging portion 25313 of the second force receiving member 2531, so that the second force receiving member 2531 rotates from the first position to the second position, and the "U" shaped extension arm 2511 of the first electrical communication member 251 is in electrical contact with the hook portion 2522 of the second electrical communication member 252; when the process cartridge 100 is loaded into the image forming apparatus and is in an image forming operation, the second force receiving member 2531 is in the second position, the "U" shaped extension arm 2511 of the first electrical communication member 251 is in electrical contact with the hook 2522 of the second electrical communication member 252, and the developing roller 22 is charged; when the process cartridge is loaded into the image forming apparatus and is in a non-image forming operation, the second force receiving member 2531 receives the force of the second force applying portion 202, the second force receiving member 2531 deflects relative to the bearing 27, the bearing 27 does not deflect, the second force receiving member 2531 is in a third position relative to the bearing 27, the "U" shaped extension arm 2511 does not contact the hook portion 2522 of the second electrical communication member 252, and the developing roller 22 is not charged; the second compression spring 262 is compressed against the elastic force of the second compression spring 262 of the first force receiving member 261 during the deflection of the second force receiving member 2531, then when the process cartridge 100 is in the non-operating state, the second force applying portion 202 does not apply a force to the second force receiving portion 25314 of the second force receiving member 2531, since the pressing portion 2612 of the first force receiving member 261 presses against the first force receiving portion 25313 of the second force receiving member 2531, the second force receiving member 2531 returns from the third position to the second position under the elastic restoring force of the second compression spring 262, and the "U" shaped extension arm 2511 is in electrical contact with the hook portion 2522 of the second electrical communication member 252, thereby charging the developing roller 22. By this, the process cartridge 100 of the present embodiment can control the charging of the developing roller 22 by the switching device 25 during the image forming operation after being incorporated into the image forming apparatus, and can control the power-off of the developing roller 22 by the switching device 25 during the non-image forming operation, without employing the separation of the developing roller 22 from the photosensitive drum 21, to prevent the surplus developer on the developing roller 22 from adhering to the photosensitive drum when no image is formed, and can ensure the printing quality.
The above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. There are many variations on the shape, construction and principle of the present invention, such as the first resilient element may be integral with the second force-receiving member or may be separate, the first mounting portion of the first force-receiving member may be a protrusion or the like. Accordingly, it is intended that any such alterations and modifications be included within the scope of the invention, without departing from the spirit and scope thereof.
Claims (12)
1. A process cartridge detachably mountable to an image forming apparatus, the image forming apparatus including a first urging portion and a second urging portion; the process cartridge includes:
The device comprises a developing unit and a photosensitive unit, wherein the photosensitive unit comprises a photosensitive unit frame and a photosensitive drum, and the developing unit comprises a developing unit frame and a developing roller;
A first force receiving member, located at a first end of the process cartridge in a longitudinal direction, for receiving a force from the first force applying portion;
a developing electrode located at a second end of the process cartridge in a longitudinal direction; the method is characterized in that:
the process cartridge further includes a switching device at the first end of the process cartridge, the switching device including a second force receiving assembly including a second force receiving member and a first elastic member, a first electrical communication member connected with the second force receiving member and the developing roller, and a second electrical communication member; the second electrical communication member is connected with the 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 a second position and a third position;
In a state in which the process cartridge is loaded into the image forming apparatus, the second force receiving member is located at the second position during an image forming operation, the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is electrically connected with the developing electrode; the second force receiving member is located at the third position during a non-image forming operation, the first electrical communication member is not in contact with the second electrical communication member, and the developing roller is electrically disconnected from the developing electrode;
The second force receiving member is located at the first position by the elastic force of the first elastic member before the process cartridge is loaded into the image forming apparatus;
When the process cartridge is loaded into the image forming apparatus, the first force receiving member receives a force from the first force applying portion and presses against the second force receiving member, causing the second force receiving member to rotate from the first position to the second position with respect to the developing unit frame, the first electrical communication member being in electrical contact with the second electrical communication member;
When the second force receiving member receives a force from the second force applying portion, the second force receiving member moves from the second position to the third position with respect to the developing unit frame, the first electrical communication member is separated from the second electrical communication member, and the developing roller is electrically disconnected from the developing electrode;
When the second force receiving member receives no force from the second force applying portion during an image forming operation, the second force receiving member returns from the third position to the second position, the first electrical communication member is in electrical contact with the second electrical communication member, and the developing roller is electrically connected to the developing electrode.
2. A process cartridge according to claim 1, wherein:
the second force receiving member includes a first force receiving portion for receiving a force of the first force receiving assembly to position the second force receiving member in the second position, a second force receiving portion for receiving a force of the second force applying portion to move the second force receiving member relative to the developing unit frame from the second position to the third position, a first mounting portion, and a supported portion, the first elastic piece having an elastic force to the second force receiving member to position the second force receiving member in the first position.
3. A process cartridge according to claim 2, wherein:
The developing unit further includes a bearing having a supporting portion, the supported portion of the second force receiving member is sleeved on the supporting portion, and a space is provided between the second force receiving member and the bearing.
4. A process cartridge according to claim 3, wherein:
The supported part is a U-shaped groove, the corresponding supporting part is a rod piece, and the U-shaped groove is sleeved on the rod piece.
5. The process cartridge according to claim 4, wherein:
The U-shaped groove comprises a first lug and a second lug, a space is arranged between the first lug and the bearing in the moving direction of the second force application part, and the second force receiving component is offset relative to the bearing under the action of the second force application part.
6. A process cartridge according to any one of claims 2 to 5, wherein:
The first electrical communication member is located on the developing unit and includes a first connection portion provided on the first mounting portion of the second force receiving member and moving with movement of the second force receiving member, and a second connection portion in electrical contact with the developing roller.
7. A process cartridge according to claim 6, wherein:
The first connecting part is a U-shaped extension arm, the corresponding first installation part comprises an installation hole and an installation groove, and the U-shaped extension arm penetrates through the installation hole and is provided with a part of the U-shaped extension arm located in the installation groove.
8. A process cartridge according to claim 7, wherein:
The second electrical communication member is located on the developing unit and has a third connecting portion electrically connected to the developing electrode and a fourth connecting portion at least a portion of which contacts the "U" shaped extension arm when the second force receiving member is located in the second position.
9. A process cartridge according to claim 8, wherein:
The developing unit further includes a gear protecting cover having a second mounting portion, and the fourth connecting portion is mounted at the second mounting portion.
10. A process cartridge according to claim 9, wherein:
the fourth connecting part is a hook part, the corresponding second mounting part is a concave part, and the hook part is sleeved in the concave part.
11. A process cartridge according to any one of claims 7 to 10, wherein:
The first elastic piece is a first compression spring.
12. A process cartridge according to any one of claims 7 to 10, wherein:
The first and second electrical communication members are made of conductive wires or sheets or wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926048.8A CN110609459B (en) | 2019-09-27 | 2019-09-27 | Process cartridge |
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|---|---|---|---|
| CN201910926048.8A CN110609459B (en) | 2019-09-27 | 2019-09-27 | Process cartridge |
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| CN110609459B true CN110609459B (en) | 2024-07-09 |
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| CN210776192U (en) * | 2019-09-27 | 2020-06-16 | 珠海联合天润打印耗材有限公司 | Processing box |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5949240B2 (en) * | 2012-07-09 | 2016-07-06 | ブラザー工業株式会社 | Image forming apparatus |
| JP2014044358A (en) * | 2012-08-28 | 2014-03-13 | Oki Data Corp | Developing device and image forming apparatus |
| JP6242201B2 (en) * | 2012-12-14 | 2017-12-06 | キヤノン株式会社 | Process cartridge and image forming apparatus |
| JP2014119592A (en) * | 2012-12-17 | 2014-06-30 | Canon Inc | Process cartridge and image forming apparatus |
| JP6638207B2 (en) * | 2015-03-31 | 2020-01-29 | ブラザー工業株式会社 | Fixing device |
| CN206369915U (en) * | 2016-12-24 | 2017-08-01 | 江西亿铂电子科技有限公司 | Developing cell and the handle box comprising the developing cell |
| CN207817416U (en) * | 2018-01-23 | 2018-09-04 | 珠海联合天润打印耗材有限公司 | A kind of handle box and its imaging device |
| CN108398871B (en) * | 2018-04-23 | 2024-06-11 | 珠海联合天润打印耗材有限公司 | Process cartridge |
| CN109765773B (en) * | 2019-03-09 | 2024-01-09 | 珠海联合天润打印耗材有限公司 | Process cartridge |
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| CN210776192U (en) * | 2019-09-27 | 2020-06-16 | 珠海联合天润打印耗材有限公司 | Processing box |
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