CN220491186U - Developing device and drum assembly - Google Patents

Abstract

A developing device, comprising: a cartridge for accommodating a developer, the cartridge having a first end and a second end in an X direction, the first end being provided with a driving portion for receiving a driving force output from the image forming apparatus; the developing roller is rotatably arranged on the box body, the rotation axis of the developing roller extends along the X direction, and comprises a developing roller shaft and a developing roller main body, and the developing roller main body wraps the developing roller shaft; the powder feeding roller is rotatably arranged on the box body, the rotation axis of the powder feeding roller extends along the X direction, and the powder feeding roller comprises a powder feeding roller shaft and a powder feeding roller main body, and the powder feeding roller main body wraps the powder feeding roller shaft; the second end of the box body is provided with a first electric receiving part which is electrically connected with the powder feeding roller; the first electrical receiving portion can be configured to contact and electrically connect with the conductive member of the drum assembly, and a projection of the first electrical receiving portion in the X direction overlaps a projection of the powder feeding roller in the X direction.

Description

Developing device and drum assembly

Technical Field

The present utility model relates to an image forming apparatus, and more particularly, to a developing apparatus and a drum assembly.

Background

The image forming apparatus forms an image on a recording material (such as paper) using an electrophotographic image forming process. Examples of the image forming apparatus include an electrophotographic copying machine, an electrophotographic printer, a facsimile machine, a word processor, and the like.

The process cartridge is detachably mounted on the image forming apparatus, and includes a developing device and a drum assembly that are detachably assembled. The developing device is internally provided with a developing roller and a powder feeding roller, the drum assembly is internally provided with a photosensitive drum, the powder feeding roller can transfer the developer to the developing roller, and the developing roller can transfer the developer to the photosensitive drum. In order for the toner feed roller and the developing roller to be able to better adsorb developer, it is necessary to supply power to the toner feed roller and the developing roller through power supply terminals on the image forming apparatus.

The power supply mode on the existing processing box is unreasonable.

Disclosure of Invention

According to an aspect of the present utility model, there is provided a developing device for detachable combination with a drum assembly and detachable mounting to an image forming apparatus, comprising:

a cartridge for accommodating a developer, the cartridge having a first end and a second end in an X direction, the first end being provided with a driving portion for receiving a driving force output from the image forming apparatus;

a developing roller rotatably provided on the cartridge body, a rotation axis of the developing roller extending in an X direction, the developing roller including a developing roller shaft and a developing roller body that wraps the developing roller shaft;

the powder feeding roller is rotatably arranged on the box body, the rotation axis of the powder feeding roller extends along the X direction, the powder feeding roller comprises a powder feeding roller shaft and a powder feeding roller main body, and the powder feeding roller main body wraps the powder feeding roller shaft;

a first electric receiving part is arranged at the second end of the box body and is electrically connected with the powder feeding roller;

the first electrical receiving portion can be used to contact and electrically connect with the conductive assembly of the drum assembly, and the projection of the first electrical receiving portion in the X direction overlaps the projection of the powder feeding roller in the X direction.

The utility model enables the distance between the first electric receiving part and the powder feeding roller to be closer by the arrangement mode of overlapping the projection of the first electric receiving part and enables the arrangement of the developing device and the processing box to be simpler and more compact.

In some embodiments, a connecting conductive member is further disposed on the second end of the case, and one end of the connecting conductive member is in contact with the powder feeding roller shaft and electrically connected to the other end of the connecting conductive member is in contact with the developing roller shaft and electrically connected to the developing roller shaft.

In some embodiments, the second end of the box body is provided with a bearing bracket, the bearing bracket is used for supporting the developing roller shaft and the powder feeding roller shaft, and the connecting conductive piece is arranged on the bearing bracket, or the connecting conductive piece is realized as the bearing bracket, and the bearing bracket is integrally made of conductive materials.

In some embodiments, the connection conductive member is integrally formed with the bearing bracket by two-shot molding, or the connection conductive member is made of a conductive metal material and is formed separately from the bearing bracket.

In some embodiments, a second electrical receiving portion is further provided on the second end of the cartridge body, the second electrical receiving portion being electrically connected to the developing roller, the second electrical receiving portion being operable to contact and electrically connect with the conductive member of the drum assembly, and a projection of the second electrical receiving portion in the X direction overlapping a projection of the developing roller in the X direction.

In some embodiments, the first electrical receiving portion is provided at an end of the powder feeding roller shaft in the X direction, or the first electrical receiving portion is implemented as an end of the powder feeding roller shaft in the X direction;

the second electric receiving portion is provided at an end of the developing roller shaft in the X direction, or is implemented as an end of the developing roller shaft in the X direction.

The present utility model also provides a drum assembly for removable mounting to an image forming apparatus, and for removable combination with a developing apparatus as described in any one of the above, comprising: a frame, a photosensitive drum rotatably provided on the frame in an X direction, and a conductive member; the conductive member is configured to receive a voltage supplied from the image forming apparatus and to be in contact with and electrically connected to the first electrical receiving portion.

In some embodiments, the frame has a first wall and a second wall corresponding to the developing device in the X-direction, the first wall being opposite to a first end of the cartridge body and the second wall being opposite to a second end of the cartridge body in a state in which the developing device is combined with the drum assembly;

the conductive member includes a first conductive member provided on the second wall of the frame and having an electric receiving surface for receiving a voltage of a developing roller power supply terminal of the image forming apparatus, a projection of the electric receiving surface in an X direction at least partially overlapping a projection of the driving portion in the X direction.

In some embodiments, the distance of the electrical receiving surface from the developing roller in the Y direction is less than the distance of the electrical receiving surface from the photosensitive drum in the Y direction;

the box body of the developing device is also rotatably provided with a stirring frame along the X direction, and the electric receiving surface is positioned between the stirring frame and the developing roller along the Y direction.

In some embodiments, the second wall has a first surface and a second surface in the X-direction, the first surface being further from the second end of the cartridge in the X-direction than the second surface;

a first positioning protrusion is provided on the first surface, the first positioning protrusion is further away from a second surface of the frame in the X direction than the first surface, and the electric receiving surface is provided on the first positioning protrusion;

the second wall is provided with a positioning through hole, the positioning through hole is communicated with the first surface and the second surface in the X direction, the first conductive piece is provided with a first extension part extending towards the second surface of the frame, and the first extension part is arranged in the positioning through hole.

In some embodiments, the conductive assembly further includes a third conductive member disposed on the second wall of the frame and in contact with and electrically connected to the first conductive member and the first electrical receiving portion, respectively, a projection of the third conductive member in the X-direction at least partially overlapping a projection of the powder feeding roller in the X-direction.

In some embodiments, the third conductive element includes a third extension and a third bend; the third extending part is connected with the first extending part of the first conductive piece, the third bending part is connected with the third extending part, and the third bending part has elasticity to enable the third bending part to be in contact with the first electric receiving part and be electrically connected with the first electric receiving part.

In some embodiments, a second electrical receiving portion is further provided on the second end of the cartridge of the developing device, the second electrical receiving portion being electrically connected to the developing roller, the second electrical receiving portion being operable to contact and electrically connect with the conductive member of the drum assembly, and a projection of the second electrical receiving portion in the X direction overlapping a projection of the developing roller in the X direction;

the conductive assembly further comprises a second conductive piece, the second conductive piece is arranged on the second wall, the second conductive piece is respectively contacted with the first conductive piece and the second electric receiving part and is electrically connected with the first electric receiving part, and the projection of the second conductive piece in the X direction is at least partially overlapped with the projection of the developing roller in the X direction.

In some embodiments, the second end of the second conductive element has a second extension toward the second electrical receiving portion, and a second bend connected to a free end of the second extension; the second extension portion and the second bending portion have elasticity such that the second bending portion is in contact with and electrically connected to the second electric receiving portion.

In some embodiments, the second wall has a first surface and a second surface in the X-direction, the first surface being further from the second end of the cartridge in the X-direction than the second surface;

a first positioning protrusion is provided on the first surface, the first positioning protrusion is further away from a second surface of the frame in the X direction than the first surface, and the electric receiving surface is provided on the first positioning protrusion;

the second wall is provided with a positioning through hole, the positioning through hole is communicated with the first surface and the second surface in the X direction, the first conductive piece is provided with a first extension part extending towards the second surface of the frame, and the first extension part is arranged in the positioning through hole;

the second conductive piece is provided with a first end, a connecting part and a second end which are sequentially connected;

a second positioning protrusion is arranged in the positioning through hole, the second positioning protrusion divides the positioning through hole into a first accommodating part and a second accommodating part, the first accommodating part is closer to the first positioning protrusion than the second accommodating part in the Y direction, the first end of the second conductive piece is provided with a first bending part facing the second surface of the frame, the first bending part is provided with elasticity to enable the first bending part to be at least partially clamped and positioned in the first accommodating part, and the first bending part is electrically connected with the first extending part; a second end of the second conductive member is in contact with and electrically connected to the second electrical receiving portion;

the second extension is at least partially disposed within the second receptacle.

In some embodiments, the connecting portion of the second conductive member is disposed at the second positioning protrusion, and a portion of the connecting portion closest to the first surface is located within the positioning through hole.

Drawings

Fig. 1 is a schematic view of a process cartridge according to a first embodiment of the present utility model;

fig. 2 is a schematic view of a part of the structure of a process cartridge according to the first embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a relevant portion of a conductive component according to a first embodiment of the present utility model;

fig. 4 is another schematic structural diagram of a relevant portion of a conductive component according to a first embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a relevant portion of a connecting conductive member according to a first embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a related portion of a conductive component according to a second embodiment of the present utility model;

fig. 7 is another schematic structural diagram of a related portion of a conductive component according to a second embodiment of the present utility model;

fig. 8 is a schematic structural diagram of a related portion of a conductive component according to a third embodiment of the present utility model;

fig. 9 is a schematic structural diagram of a relevant portion of a conductive component according to a fourth embodiment of the present utility model;

fig. 10 is a schematic view of a part of the structure of a process cartridge according to a fourth embodiment of the present utility model.

Reference numerals:

a developing device 1; a case 11; a first end 11a of the case; a second end 11b of the case; a driving section 12; a developing roller 13; a powder feeding roller 14; a stirring frame 15; a cross beam 16; a bearing bracket 17; a powder discharge knife 18; a connection conductive member 19; a drum assembly 2; a frame 21; a first wall 21a; a second wall 21b; a first surface 211; a second surface 211b; a first positioning protrusion 212; a second positioning protrusion 213; positioning through hole 214; a first accommodating portion 2141; a second accommodating part 2142; a photosensitive drum 22; a conductive member 3; a first conductive member 31; an electric receiving surface 311; a first extension 312; a second conductive member 32; a first bending portion 321; a connection portion 322; a second extension 323; a second bending portion 324; a third conductive member 33; a third extension 331; a third bending portion 332; and a resistor 35.

Detailed Description

The present utility model will now be described in further detail with reference to the accompanying drawings, wherein the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; may be a mechanical connection; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the above description, descriptions of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Example 1

Referring to fig. 1-2, the present embodiment provides a process cartridge detachably mountable to an image forming apparatus. The process cartridge includes a developing device 1 and a drum assembly 2 which are detachably assembled.

In order to better understand the embodiment, a three-dimensional rectangular coordinate system is established, the length direction of the processing box is taken as the X direction, the width direction is taken as the Y direction, the height direction is taken as the Z direction, and the three directions are mutually perpendicular. In the X direction, the process cartridge has a first end (near the X direction in the drawing) for receiving a driving force from the image forming apparatus, and a second end (near the opposite direction to the X direction in the drawing) for electrically connecting with a power supply terminal of the image forming apparatus to supply power to the developing roller 13 and the toner feeding roller 14 of the developing apparatus 1.

The developing device 1 includes a cartridge 11, a driving portion 12, a developing roller 13, a powder feeding roller 14, a stirring frame 15, a first electric receiving portion, a second electric receiving portion, and a connecting conductive member 19, and the developing roller 13, the powder feeding roller 14, and the stirring frame 15 are rotatably provided on the cartridge 11 in the X direction. The case 11 has a first end 11a and a second end 11b in the X direction, and the driving section 12 for receiving a driving force of the image forming apparatus is provided at the first end 11a of the case 11. The toner feed roller 14 is used to transfer the developer to the developing roller 13, and the stirring frame 15 is used to stir the developer in the cartridge 11 to prevent the developer from agglomerating. The cartridge 11 includes a bearing bracket 17, the bearing bracket 17 being located at a second end 11b of the cartridge 11, and one ends of the developing roller 13 and the powder feeding roller 14 located at the second end in the X direction being supported by the bearing bracket 17. The developing roller 13 includes a developing roller shaft and a developing roller body enclosed on the developing roller shaft. The toner roller 14 includes a toner roller shaft and a toner roller body enclosed on the toner roller shaft.

The developing device receives voltages from the image forming device through the first electric receiving part and the second electric receiving part to supply power to the powder feeding roller and the developing roller.

The first electrical receiving portion can be configured to contact and electrically connect with the conductive assembly of the drum assembly. The first electric receiving part is arranged at the second end 11b of the box body, and the projection of the first electric receiving part in the X direction is overlapped with the projection of the powder feeding roller in the X direction, namely, the projection of the first electric receiving part in the X direction is completely overlapped with the projection of the powder feeding roller in the X direction, or the projection of the first electric receiving part in the X direction is contained in the projection of the powder feeding roller in the X direction. The first electric receiving part is electrically connected with the powder feeding roller. The first electric receiving part may be a separate member provided at an end of the powder feeding roller shaft in the X direction, may be manufactured separately from the powder feeding roller shaft and then fixed, or may be integrally formed with the powder feeding roller shaft, and in this embodiment, the first electric receiving part is implemented as an end of the powder feeding roller shaft in the X direction, that is, the first electric receiving part is not a separate member but exists as a part of an end of the powder feeding roller shaft, for example, may be an end surface and/or an outer circumferential surface of an end of the powder feeding roller shaft. The first electric receiving part is arranged in a mode of overlapping with the projection of the powder feeding roller, so that the distance between the first electric receiving part and the powder feeding roller is relatively short, and the developing device is simpler and more compact to arrange.

The second electrical receiving portion can be configured to contact and electrically connect with the conductive assembly of the drum assembly. The second electric receiving portion is provided at the second end 11b of the cartridge body, and the projection of the second electric receiving portion in the X direction overlaps with the projection of the developing roller in the X direction, that is, the projection of the second electric receiving portion in the X direction completely overlaps with the projection of the developing roller in the X direction, or the projection of the second electric receiving portion in the X direction is included in the projection of the developing roller in the X direction. The second electric receiving portion is electrically connected to the developing roller. The second electric receiving portion may be a separate member provided at an end portion of the developing roller shaft in the X direction, may be manufactured separately from the developing roller shaft and then attached thereto, or may be integrally formed with the developing roller shaft, and in this embodiment, the second electric receiving portion is implemented as an end portion of the developing roller shaft in the X direction, that is, the second electric receiving portion is not a separate member but exists as a part of the end portion of the developing roller shaft, for example, may be an end surface and/or an outer circumferential surface of the end portion of the developing roller shaft. The second electric receiving part is arranged in a mode of overlapping with the projection of the developing roller, so that the distance between the second electric receiving part and the developing roller is relatively short, and the developing device is simpler and more compact to arrange.

Referring to fig. 5, the connecting conductive member 19 has one end in contact with and electrically connected to the toner feeding roller shaft and the other end in contact with and electrically connected to the developing roller shaft, thereby transmitting the voltage transmitted to the developing roller 13 through the first conductive member 31 and the second conductive member 32 to the toner feeding roller 14. In the present embodiment, the projection of the connection conductive member 19 in the X direction does not overlap with the projection of the driving portion 12 in the X direction. In this embodiment, the connecting conductive member 19 is disposed on the bearing support 17, the connecting conductive member 19 may be made of conductive resin by two-shot molding with the bearing support 17, or the connecting conductive member 19 may be made of conductive metal material, such as a metal sheet or a wire, and then separately made with the bearing support 17 for fixing, or the connecting conductive member is implemented as a bearing support, and the bearing support is integrally made of conductive material.

The drum assembly 2 includes a frame 21, a photosensitive drum 22, and a conductive assembly, the photosensitive drum 22 being rotatably provided on the frame 21 in the X direction, the frame 21 having a first wall 21a and a second wall 21b in the X direction, which correspond to the first end 11a and the second end 11b of the cartridge 11 of the developing device 1, i.e., the first wall 21a of the frame is opposite to the first end 11a of the cartridge and the second wall 21b of the frame is opposite to the second end 11b of the cartridge in a state in which the developing device is combined with the drum assembly. Referring to fig. 2-3, the second wall 21b of the frame 21 has a first surface 211 and a second surface 211b, the first surface 211 being further from the second end 11b of the cartridge in the X-direction than the second surface 211b. The first surface 211 is provided with a first positioning protrusion 212, and the first positioning protrusion 212 is farther from the second surface 211b of the frame 21 than the first surface 211 in the X direction. The second wall 21b is further provided with a positioning through hole 214, and the positioning through hole 214 communicates the first surface 211 and the second surface 211b in the X direction. The positioning through hole 214 is provided with a second positioning protrusion 213, and a side surface of the second positioning protrusion 213 closest to the first surface 211 is positioned in the positioning through hole 214. The second positioning protrusion 213 partitions the positioning through hole 214 into a first receiving portion 2141 and a second receiving portion 2142, the first receiving portion 2141 being closer to the first positioning protrusion 212 than the second receiving portion 2142 in the Y direction.

The conductive member 3 is for receiving a voltage of a power supply terminal of the image forming apparatus and transmitting to the developing roller 13 and the toner feeding roller 14. Referring to fig. 2-5, the conductive assembly 3 includes a first conductive member 31 and a second conductive member 32. The developing roller power supply terminal, the first conductive member 31, the second conductive member 32, the second electric receiving portion, the connecting conductive member 19, and the toner feeding roller shaft of the image forming apparatus are electrically connected in this order. In this embodiment, although the developing device is provided with the first electric receiving portion, the first electric receiving portion is not directly in contact with the conductive member, that is, the first electric receiving portion is not used, and the first electric receiving portion can be used when the developing device is combined with the drum member of the third embodiment, and such arrangement of the developing device can be appropriately matched with different drum members.

The first conductive member 31 and the second conductive member 32 may be formed separately or integrally, and may be made of a conductive material such as a metal sheet or a conductive resin.

The first conductive member 31 is provided on the second wall 21b of the frame 21 of the drum assembly 2, and has an electric receiving surface 311 and a first extension 312. The electric receiving surface 311 is used for directly electrically contacting with a developing roller power supply terminal of the image forming device, the projection of the electric receiving surface 311 in the X direction is at least partially overlapped with the projection of the driving part 12 in the X direction, the arrangement mode enables the design of the processing box to be more compact, when the driving part 12 of the developing device 1 receives the driving force from the image forming device, the developing device 1 can generate slight shaking on the drum assembly 2, the projection of the electric receiving surface 311 in the X direction is at least partially overlapped with the projection of the driving part 12 in the X direction, the electric receiving surface 311 is positioned on the rotating shaft line of the driving part 12 or near the rotating shaft line, the influence of shaking on the electric receiving surface 311 is small, the electric receiving surface 311 can keep contact with the developing roller power supply terminal of the image forming device, and the stability of the electric contact is increased. In this embodiment, the distance between the electric receiving surface 311 and the developing roller 13 in the Y direction is smaller than the distance between the electric receiving surface 311 and the photosensitive drum 22 in the Y direction, and the electric receiving surface 311 is located between the stirring frame 15 and the developing roller 13 in the Y direction, so that the design of the process cartridge is more compact, and the electric receiving surface 311 is closer to the developing roller 13, so that the power supply process is not easily disturbed, and the power supply failure caused by structural damage of the overlong power supply distance in the transportation or storage process is avoided. The first conductive member 31 further has a first extension 312 extending toward the second surface 211b of the frame 21, the first extension 312 being disposed in the first receiving portion 2141 of the positioning through hole 214.

The second conductive member 32 is disposed on the second wall 21b of the frame 21 of the drum assembly 2, and has a first end, a connecting portion 322 and a second end which are sequentially connected, the connecting portion 322 of the second conductive member 32 is disposed at the second positioning protrusion 213 in the positioning through hole 214, and a portion of the connecting portion 322 closest to the first surface is disposed in the positioning through hole 214 and shielded and protected by the positioning through hole 214, so that collision damage of the second conductive member 32 with other components can be better avoided, and false contact of the second conductive member 32 with conductive components such as a power supply terminal of the powder feeding roller can be avoided. The first end of the second conductive member 32 has a first bending portion 321 facing the second surface 211b of the frame 21, where the first bending portion 321 is specifically U-shaped, and the first bending portion 321 is at least partially disposed in the first accommodating portion 2141 and is used for being electrically connected with the first extending portion 312 of the first conductive member 31, and the bending design of the first bending portion 321 makes it have a certain elasticity, so that it can be better clamped and positioned in the first accommodating portion 2141, thereby being convenient for installation and positioning, and avoiding loosening during transportation and installation. The second conductive member 32 has a second extending portion 323 facing the second electrical receiving portion, and a second bending portion 324 connected to a free end of the second extending portion 323, wherein the second bending portion 324 is configured to abut against an end of the developing roller shaft, and in this embodiment, the second bending portion 324 has a U-shaped structure and abuts against the second electrical receiving portion. The second extending portion 323 is at least partially disposed in the second accommodating portion 2142, and both the second extending portion 323 and the second bending portion 324 have elasticity, so that when the developing roller shaft and/or the second electric receiving portion are axially or radially offset during installation and use, both the second bending portion 324 can be electrically connected with the second electric receiving portion well.

The second bending portion 324 overlaps with the projection of the developing roller in the X direction, thereby ensuring that the third bending portion 332 can come into contact and abutment with the second electric receiving portion. And because the two parts are overlapped, the developing device does not need to be provided with a conductive part with a complex structure to guide the voltage to the developing roller and the powder feeding roller from other positions, and the developing device can directly contact with the end part of the developing roller to supply power. Therefore, the conductive component 3 with a complex structure only needs to be arranged on the drum component, and the service life of the drum component can generally meet the requirement of using a plurality of developing devices, namely, one conductive component 3 can correspond to a plurality of developing devices, and compared with the conductive component 3 arranged on the developing devices, the cost is reduced.

The electric connection between the developing roller 13 and the powder feeding roller 14 is realized through the conductive component 3, so that the conductive component 3 can simultaneously supply power to the developing roller 13 and the powder feeding roller 14 only by obtaining voltage through the power supply terminals of the developing roller, the image forming device does not need to additionally arrange the power supply terminals of the powder feeding roller, only the power supply terminals of the developing roller are required to be arranged, the number of the power supply terminals of the image forming device is reduced, the structure is simplified, and the manufacturing cost of the image forming device is reduced.

Example two

Referring to fig. 6 to 7, this embodiment is substantially the same as the first embodiment except that the developing device of this embodiment is not provided with the connecting conductive member 19, but is provided with the third conductive member 33 on the conductive member of the drum assembly.

The conductive assembly 3 of the present embodiment includes a first conductive member 31, a second conductive member 32, and a third conductive member 33. The first conductive element 31 and the second conductive element 32 are disposed in the same manner as in the first embodiment, and will not be described again.

The third conductive member 33 is provided on the second wall 21b of the frame 21 of the drum assembly 2 for electrical connection between the first conductive member 31 and the first electrical receiving portion, transmitting the voltage of the first conductive member 31 to the powder feeding roller 14. The third conductive member 33 includes a third extension portion 331 and a third bending portion 332. The third extension 331 is substantially parallel to the Z direction, and is disposed below the first extension 312 of the first conductive member 31 and connected to the first extension 312. The third bending portion 332 is connected to the third extending portion 331 and abuts against the first electrical receiving portion, and in this embodiment, the third bending portion 332 has a V-shaped structure and abuts against the first electrical receiving portion.

The projection of the third bending part 332 in the X direction overlaps with the projection of the first electric receiving part in the X direction, thereby ensuring that the third bending part 332 can make contact and abutment with the first electric receiving part. And because the two parts are overlapped, the developing device does not need to be provided with a conductive part with a complex structure to guide the voltage to the developing roller and the powder feeding roller from other positions, but only needs to be directly contacted with the ends of the powder feeding roller and the developing roller for supplying power. Therefore, the conductive component 3 with a complex structure only needs to be arranged on the drum component, and the service life of the drum component can generally meet the requirement of using a plurality of developing devices, namely, one conductive component 3 can correspond to a plurality of developing devices, and compared with the conductive component 3 arranged on the developing devices, the cost is reduced.

The third bending part 332 has elasticity, and when the powder feeding roller shaft and/or the first electric receiving part are/is axially or radially deflected in the installation and use process, the third bending part 332 can be well electrically connected with the first electric receiving part. In the present embodiment, the projection of the third conductive member 33 in the X direction does not overlap with the projection of the driving portion 12 in the X direction.

Example III

Referring to fig. 8, this embodiment is substantially the same as the second embodiment except that the conductive member 3 of the drum assembly of this embodiment is not provided with the second conductive member 32, but is provided with the connecting conductive member 19 on the developing device.

The conductive member 3 of the present embodiment includes a first conductive element 31 and a third conductive element 33. The developing device further includes a connection conductive member 19, and a developing roller power supply terminal of the image forming apparatus, a first conductive member 31, a third conductive member 33, a first power receiving portion, the connection conductive member 19, and a developing roller shaft are electrically connected in this order, and a voltage of the developing roller power supply terminal is transmitted to the first power receiving portion through the first conductive member 31 and the third conductive member 33, and then the voltage is transmitted to the developing roller shaft through the connection conductive member 19. The first conductive member 31 and the third conductive member 33 are disposed in the same manner as in the first embodiment, and the connection conductive member 19 is disposed in the same manner as in the first embodiment, which will not be described again. In this embodiment, although the developing device is provided with the second electric receiving portion, the second electric receiving portion is not directly in contact with the conductive member, that is, the second electric receiving portion is not used, and the second electric receiving portion can be used when the developing device is combined with the drum member of the first embodiment, and such arrangement of the developing device can be appropriately matched with a different drum member.

The conductive component 3 with a complex structure is only required to be arranged on the drum component, and the service life of the drum component can generally meet the requirement of using a plurality of developing devices, namely, one conductive component 3 can correspond to a plurality of developing devices, and compared with the conductive component 3 arranged on the developing devices, the cost is reduced.

Example IV

Referring to fig. 9, the difference between the present embodiment and the first embodiment is that: the conductive member 3 of the present embodiment is connected to the toner feeding roller power supply terminal instead of the developing roller power supply terminal, and reduces the voltage of the toner feeding roller power supply terminal to the voltage required for the developing roller 13 through the resistor 35.

The conductive member 3 of the present embodiment may be provided on a developing device including the first conductive member 31 and the resistor 35, and the developing device further includes the connection conductive member 19. The power feeding roller power feeding terminal, the first conductive member 31, the resistor 35, and the connecting conductive member 19 of the image forming apparatus are electrically connected in this order, and the connecting conductive member 19 is electrically connected to the first electric receiving portion and the second electric receiving portion, respectively. In this power supply mode, the voltage of the power supply terminal of the powder feeding roller is reduced through the resistor 35, so that the power supply terminal of the powder feeding roller can supply power for the powder feeding roller 14 and can supply power for the developing roller 13, the conductive component 3 only needs to obtain voltage through the power supply terminal of the powder feeding roller, the image forming device does not need to additionally arrange the power supply terminal of the developing roller, only needs to arrange the power supply terminal of the powder feeding roller, the arrangement quantity of the power supply terminals of the image forming device is reduced, the structure is simplified, and the manufacturing cost of the image forming device is reduced.

In this embodiment, the beam 16 for reinforcing the strength of the case 11 and supporting the powder discharging blade 18 is further disposed in the case 11, and the powder discharging blade 18 and the beam 16 both extend along the X direction, and the projection of the first conductive member 31 in the X direction does not overlap with the projection of the beam 16 in the X direction.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that several modifications and improvements can be made to the above-described embodiments, or the above-described embodiments can be freely combined, including the technical features of the different embodiments described above, without departing from the inventive concept of the present utility model.

Claims (16)

1. A developing device for detachable combination with a drum assembly and detachable mounting to an image forming apparatus, comprising:

a cartridge for accommodating a developer, the cartridge having a first end and a second end in an X direction, the first end being provided with a driving portion for receiving a driving force output from the image forming apparatus;

a developing roller rotatably provided on the cartridge body, a rotation axis of the developing roller extending in an X direction, the developing roller including a developing roller shaft and a developing roller body that wraps the developing roller shaft;

the powder feeding roller is rotatably arranged on the box body, the rotation axis of the powder feeding roller extends along the X direction, the powder feeding roller comprises a powder feeding roller shaft and a powder feeding roller main body, and the powder feeding roller main body wraps the powder feeding roller shaft;

a first electric receiving part is arranged at the second end of the box body and is electrically connected with the powder feeding roller;

the first electrical receiving portion can be used to contact and electrically connect with the conductive assembly of the drum assembly, and the projection of the first electrical receiving portion in the X direction overlaps the projection of the powder feeding roller in the X direction.

2. A developing device according to claim 1, wherein a connecting conductive member is further provided on the second end of the casing, and one end of the connecting conductive member is in contact with the powder feeding roller shaft and the other end thereof is in contact with and electrically connected to the developing roller shaft.

3. A developing apparatus according to claim 2, wherein the second end of the casing is provided with a bearing bracket for supporting the developing roller shaft and the powder feeding roller shaft, and the connecting conductive member is provided on the bearing bracket, or the connecting conductive member is implemented as the bearing bracket, and the bearing bracket is integrally made of a conductive material.

4. A developing apparatus according to claim 3, wherein said connecting conductive member is integrally formed with said bearing bracket by two-shot molding, or said connecting conductive member is made of a conductive metal material and is formed separately from the bearing bracket.

5. A developing device according to any one of claims 1 to 4, wherein a second electric receiving portion is further provided on the second end of the cartridge body, the second electric receiving portion being electrically connected to the developing roller, the second electric receiving portion being usable for contact with and electric connection with the conductive member of the drum member, and a projection of the second electric receiving portion in the X direction overlaps a projection of the developing roller in the X direction.

6. A developing device according to claim 5, wherein said first electric receiving portion is provided at an end of said toner feeding roller shaft in the X direction, or is implemented as an end of said toner feeding roller shaft in the X direction;

the second electric receiving portion is provided at an end of the developing roller shaft in the X direction, or is implemented as an end of the developing roller shaft in the X direction.

7. A drum assembly for removable mounting to an image forming apparatus, further operable to be removably combined with a developing apparatus as claimed in any one of claims 1 to 6, comprising: a frame, a photosensitive drum rotatably provided on the frame in an X direction, and a conductive member; the conductive member is configured to receive a voltage supplied from the image forming apparatus and to be in contact with and electrically connected to the first electrical receiving portion.

8. The drum assembly of claim 7, wherein: the frame has a first wall and a second wall corresponding to the developing device in an X direction, the first wall being opposite to a first end of the cartridge body and the second wall being opposite to a second end of the cartridge body in a state in which the developing device is combined with the drum assembly;

the conductive member includes a first conductive member provided on the second wall of the frame and having an electric receiving surface for receiving a voltage of a developing roller power supply terminal of the image forming apparatus, a projection of the electric receiving surface in an X direction at least partially overlapping a projection of the driving portion in the X direction.

9. The drum assembly of claim 8, wherein:

the distance between the electric receiving surface and the developing roller in the Y direction is smaller than the distance between the electric receiving surface and the photosensitive drum in the Y direction;

the box body of the developing device is also rotatably provided with a stirring frame along the X direction, and the electric receiving surface is positioned between the stirring frame and the developing roller along the Y direction.

10. The drum assembly of claim 8, wherein the second wall has a first surface and a second surface in the X-direction, the first surface being further in the X-direction from the second end of the cartridge than the second surface;

a first positioning protrusion is provided on the first surface, the first positioning protrusion is further away from a second surface of the frame in the X direction than the first surface, and the electric receiving surface is provided on the first positioning protrusion;

the second wall is provided with a positioning through hole, the positioning through hole is communicated with the first surface and the second surface in the X direction, the first conductive piece is provided with a first extension part extending towards the second surface of the frame, and the first extension part is arranged in the positioning through hole.

11. The drum assembly of claim 8, further comprising a third conductive member disposed on the second wall of the frame and in contact with and electrically connected to the first conductive member and the first electrical receiving portion, respectively, a projection of the third conductive member in the X-direction at least partially overlapping a projection of the powder feed roller in the X-direction.

12. The drum assembly of claim 11, wherein the third conductive member includes a third extension and a third bend; the third extending part is connected with the first extending part of the first conductive piece, the third bending part is connected with the third extending part, and the third bending part has elasticity to enable the third bending part to be in contact with the first electric receiving part and be electrically connected with the first electric receiving part.

13. The drum assembly according to claim 11, wherein a second electric receiving portion is further provided on a second end of the cartridge body of the developing device, the second electric receiving portion being electrically connected to the developing roller, the second electric receiving portion being operable to be in contact with and electrically connected to the conductive member of the drum assembly, and a projection of the second electric receiving portion in the X direction overlapping a projection of the developing roller in the X direction;

the conductive assembly further comprises a second conductive piece, the second conductive piece is arranged on the second wall, the second conductive piece is respectively contacted with the first conductive piece and the second electric receiving part and is electrically connected with the first electric receiving part, and the projection of the second conductive piece in the X direction is at least partially overlapped with the projection of the developing roller in the X direction.

14. The drum assembly of claim 13, wherein the second end of the second conductive member has a second extension toward the second electrical receiving portion, and a second bend connected to a free end of the second extension; the second extension portion and the second bending portion have elasticity such that the second bending portion is in contact with and electrically connected to the second electric receiving portion.

15. The drum assembly of claim 14, wherein the drum assembly comprises a plurality of rollers,

the second wall has a first surface and a second surface in the X-direction, the first surface being further in the X-direction from the second end of the cartridge than the second surface;

a first positioning protrusion is provided on the first surface, the first positioning protrusion is further away from a second surface of the frame in the X direction than the first surface, and the electric receiving surface is provided on the first positioning protrusion;

the second wall is provided with a positioning through hole, the positioning through hole is communicated with the first surface and the second surface in the X direction, the first conductive piece is provided with a first extension part extending towards the second surface of the frame, and the first extension part is arranged in the positioning through hole;

the second conductive piece is provided with a first end, a connecting part and a second end which are sequentially connected;

a second positioning protrusion is arranged in the positioning through hole, the second positioning protrusion divides the positioning through hole into a first accommodating part and a second accommodating part, the first accommodating part is closer to the first positioning protrusion than the second accommodating part in the Y direction, the first end of the second conductive piece is provided with a first bending part facing the second surface of the frame, the first bending part is provided with elasticity to enable the first bending part to be at least partially clamped and positioned in the first accommodating part, and the first bending part is electrically connected with the first extending part; a second end of the second conductive member is in contact with and electrically connected to the second electrical receiving portion;

the second extension is at least partially disposed within the second receptacle.

16. The drum assembly of claim 15, wherein the connection portion of the second conductive member is disposed at the second positioning protrusion, and a portion of the connection portion closest to the first surface is located within the positioning through hole.