Developing device and image forming apparatus

Abstract

The present invention relates to the technical field of printing devices, and provides a developing device and an image forming device, wherein the developing device includes a drum component and a developing component, wherein the drum component includes: a first housing including a mounting body and a support frame extending along a first direction on the mounting body; a drum component rotatably disposed on the mounting body; the developing component includes: a second housing; a developing roller rotatably disposed in the second housing and located on a developer outlet; the support frame includes: a fastener elastically rotatably disposed on the support frame; a recess having a fastening position close to the mounting body, the fastening position being closer to the mounting body than the fastener; an assembly portion on the second housing, the assembly portion including an adapter portion protruding toward the outside away from the second housing and a force-bearing portion; the fastener applies force to the force-bearing portion, and the force application point is closer to the opening of the recess than the fastening position in a third direction. The developing device and image forming device provided by the present invention can solve the problem that existing developing cartridges cause the image forming device to be larger in size.

Description

Technical Field

[0001] The present invention relates to the technical field of printing equipment, and in particular to a developing device and an image forming device. Background Art

[0002] Printing equipment is a commonly used office equipment in offices. Among them, there is a printer that uses laser imaging. The printer has a developing box and a laser scanning unit inside. The developing box has a photosensitive drum and a developing roller. The laser scanning unit is used to scan the laser onto the photosensitive drum of the developing box. After the photosensitive drum forms an electrostatic latent image, the developing roller transfers the developer to the surface of the photosensitive drum to form a printed image.

[0003] In the prior art, there is a split-type developing cartridge, which consists of a drum part and a developing part. Since the photosensitive drum on the drum part has a relatively long service life, only the photosensitive drum needs to be replaced to reduce the replacement cost. Figure 1 A longer support frame to encompass the drum part will be provided on the outer shell of the drum part, and a space for placing the drum part is provided inside the support frame. A support rod 118 is provided on the side of the support frame away from the developing part and the photosensitive drum, that is, on the back side of the developing part. The elastic component 119 provided on the support rod 118 presses the developing part toward the photosensitive drum so that the developing roller contacts the photosensitive drum to transfer the developer. In addition, an additional snap-fit ​​structure is used to limit the position of the developing part in other directions except the elastic direction to fix the developing part on the drum part.

[0004] However, this structure requires a larger space inside the printer, which is not conducive to the design trend of miniaturization of existing printers. In particular, the support rod part increases the lateral size of the developing box, and since the developing part needs to be taken out from the placement space, a hand grasping space of 150 is reserved between the support rod and the developing part, which cannot meet the miniaturization requirements. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a developing device and an image forming apparatus, which can solve the problem that the existing developing cartridge causes the image forming apparatus to be larger in size.

[0006] The present invention provides a developing device, which is applied to an image forming apparatus, and includes a drum component and a developing component. The drum component includes:

[0007] The first housing comprises a mounting body and a support frame extending along a first direction on the mounting body, wherein the support frame has a receiving space for accommodating the developing member;

[0008] a drum member, rotatably mounted on the mounting body;

[0009] The developing member comprises:

[0010] a second housing, wherein a cavity for storing developer and a developer outlet communicating with the cavity are provided in the second housing;

[0011] a developing roller rotatably disposed in the second housing and located on the developer outlet;

[0012] The support frame has:

[0013] Fasteners are provided on both sides of the storage space in the second direction, the fasteners are elastically rotatably provided on the support frame and the rotation axis is parallel to the second direction, and the second direction is perpendicular to the first direction;

[0014] A notch is provided on both sides of the receiving space in the second direction, the notch is open in a third direction perpendicular to the first direction and the second direction and has a buckle position close to the mounting body, the buckle position and the buckle on the corresponding side are arranged opposite to each other in the first direction, and the buckle position is closer to the mounting body than the buckle;

[0015] The second housing has mounting portions provided on both sides in the second direction, the mounting portions on the corresponding sides including an adapting portion and a force-bearing portion protruding outwardly away from the second housing, the adapting portion being closer to the developer outlet in the first direction than the force-bearing portion;

[0016] On the corresponding side of the support frame, the adapting portion is adapted in the buckle position, the buckle applies force to the force-bearing portion, and the force application point is closer to the opening of the recess than the buckle position in the third direction.

[0017] According to the developing device provided by the embodiment of the present invention, the support rod, handle and grasping space are eliminated, the longitudinal length of the split structure is shortened, and while reducing the occupied size, after the assembly parts on both sides of the developing component enter into the recess from the recess opening, the fasteners press the force-bearing parts with an elastic force biased toward the installation main body, so that the developing roller located at the front end of the developing component is elastically pressed and contacts the surface of the drum member along the first direction, thereby not being in rigid contact with the drum member in a fixed position structural form, thereby generating sufficient elastic force to squeeze the developer between the drum member and transfer the developer to the drum member in the form of a specified thickness, and the fasteners provide not only the component force in the first direction, but also because the force application point is closer to the opening of the recess than the fastener position, forming another component force in the third direction, so that the developing component is positioned on the support frame in the third direction, and there is no need to set up other additional fixing structures to fix the developing component on the drum member. Compared with the existing technical structure, it is simpler, more compact and better meets the imaging requirements.

[0018] In a preferred embodiment of the present invention, the assembly part is respectively provided as a first assembly part and a second assembly part on both sides of the second shell in the second direction, and the common straight line of the first adapter part of the first assembly part and the second adapter part of the second assembly part is parallel to the second direction.

[0019] In a preferred embodiment of the present invention, the first adapter portion and the second adapter portion are located on the rotation axis of the developing roller.

[0020] In a preferred embodiment of the present invention, the buckle position has a first limiting surface in a first direction of the adapter portion when the adapter portion is adapted in the buckle position, and a second limiting surface in a third direction of the adapter portion and toward the opening, and the adapter portion includes an elastic reset portion that contacts the first limiting surface and the second limiting surface.

[0021] In a preferred embodiment of the present invention, on at least one side of the second shell, the elastic reset part includes a connecting end connected to a fixed part of the second shell and an elastic segment bent and extended from the connecting end, and the contact part of the elastic segment with the first limiting surface forms a first bent arc surface and the contact part with the second limiting surface forms a second bent arc surface.

[0022] In a preferred embodiment of the present invention, the buckle position further has a third limiting surface which is arranged in the third direction of the adapter portion and opposite to the second limiting surface when the adapter portion is adapted in the buckle position, and the elastic section also includes a third bent arc surface in contact with the third limiting surface.

[0023] In a preferred embodiment of the present invention, on at least one side of the second housing, the elastic reset portion is made of a conductive rubber material and is in electrical contact with the developing roller.

[0024] In a preferred embodiment of the present invention, the mounting body has an image output port arranged on a side facing away from the support frame, and a portion of the outer surface of the drum is exposed at the image output port and contacts the transfer component of the image forming device through the image output port.

[0025] In a preferred embodiment of the present invention, the developing member further comprises a transmission gear set, the second housing comprises a housing body and an end cover detachably connected to a first side of the housing body in the second direction, the transmission gear set comprises a driving gear for receiving a driving force from the image forming device, the end cover comprises a protrusion for accommodating the driving gear, and the force-receiving portion of the assembly portion on the first side is located on a side of the protrusion facing away from the developer outlet;

[0026] The housing body has a bearing portion protruding away from the first side on the second side in the second direction, and the force receiving portion of the assembly portion on the second side is located on a side of the bearing portion away from the developer outlet.

[0027] By using the developing device provided by the present invention, an image forming apparatus is provided, comprising an apparatus body and the developing device as described in the above embodiment and arranged in the apparatus body.

[0028] Other features and advantages of the invention will be described in the following description and, in part, will become apparent from the description or be understood through implementation of the technical solutions of the invention. The objectives and other advantages of the invention can be achieved and obtained through the structures and / or processes particularly pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a developing cartridge provided in the prior art;

[0030] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0031] Figure 3 for Figure 2 Schematic diagram of the structure in which the action point P moves;

[0032] Figure 4 A schematic structural diagram of a developing device provided by an embodiment of the present invention at a first viewing angle;

[0033] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0034] Figure 6 A schematic diagram of a portion of the structure of a developing device including a fastener, a developing roller, and a drum member provided in an embodiment of the present invention;

[0035] Figure 7 A schematic structural diagram of a developing device provided by an embodiment of the present invention at a second viewing angle;

[0036] Figure 8 for Figure 7 A partial enlarged schematic diagram of point C in the middle;

[0037] Figure 9 A schematic structural diagram of a developing device provided by an embodiment of the present invention when a developing member and a drum member are separated;

[0038] Figure 10 A schematic structural diagram of an image forming device provided by an embodiment of the present invention.

[0039] Description of Figure Numbers:

[0040] 1 device body, 11 paper box, 12 pickup assembly, 13 conveying assembly, 14 transfer assembly, 15 developing assembly, 16 scanning assembly, 17 fixing assembly, 18 paper discharge assembly;

[0041] 100 drum member, 110 first housing, 111 mounting body, 1111 image output port, 112 supporting frame, 1121 rotating column, 1122 limiting column, 113 storage space, 114 fastener, 1141 connecting portion, 1142 extending portion, 1142a limiting arc hole, 1143 acting portion, 115 recess, 116 fastening position, 1161 first limiting surface, 1162 second limiting surface, 1163 third limiting surface, 117 elastic member, 118 supporting rod, 119 elastic member, 120 drum member, 130 charging roller, 140 first transmission gear set, 150 grasping space;

[0042] 200 developing member, 210 second housing, 211 developer outlet, 212 end cover, 2121 protruding portion, 213 bearing portion, 220 developing roller, 230 assembly portion, 231 adapting portion, 2311 connecting end, 2312 elastic section, 2312a first curved surface, 2312b second curved surface, 2312c third curved surface, 232 force-bearing portion, 240 second transmission gear set, 241 driving gear;

[0043] 300 transfer roller. DETAILED DESCRIPTION

[0044] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that these specific descriptions are only for ordinary technicians in this field to understand the present invention more easily and clearly, and are not a restrictive interpretation of the present invention; for example, the first and second mentioned in the embodiments of the present invention do not constitute a limitation thereto, but are merely for expressing the serial numbers of multiple identical or similar devices and mechanisms. Ordinary technicians in this field can also readjust these serial numbers for the convenience of expression or in the process of arranging technical solutions; and alternative solutions are described for some mechanisms in different embodiments, and these alternatives can also be applied to other identical or similar devices and mechanisms; and as long as there is no conflict, the various embodiments of the present invention and the various features in each embodiment can be combined with each other, and the technical solutions formed are all within the scope of protection of the present invention.

[0045] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments.

[0046] See Figure 10In one aspect, an embodiment of the present invention provides an image forming device, comprising a device body 1 and a paper box 11, a pickup assembly 12, a conveying assembly 13, a transfer assembly 14, a developing assembly 15, a scanning assembly 16, a fixing assembly 17 and a paper discharge assembly 18 arranged in the device body 1. A paper conveying path is provided in the device body 1. Paper for printing is stacked and stored in the paper box 11. The pickup assembly 12 comprises a pickup roller, which contacts the stacked paper and feeds the paper into the paper conveying path. The conveying assembly 13 comprises a correction roller and a paper feed roller. The correction roller is used to correct the position of the paper in the paper conveying path. The paper feed roller is used to transport the paper in the paper conveying path. The developing assembly 15 forms an image composed of a developer therein and transfers the image to the transfer assembly 14. The transfer assembly 14 transfers the image in the paper conveying path. After acquiring the image, the paper is further conveyed to the fixing assembly 17. The fixing assembly 17 fixes the image on the surface of the paper by heating. The paper after printing is finally discharged out of the device body 1 by the paper discharge assembly 18.

[0047] The scanning assembly 16 includes a laser emitting unit and an optical member for deflecting the laser light emitted by the laser emitting unit. The optical member may be composed of multiple optical components. The laser light is deflected to the developing assembly 15 for use in the imaging process of the developing assembly 15. The developing assembly 15 includes a developing cartridge having a drum member 100 with a photosensitive surface. The laser light is deflected to the photosensitive surface to form an electrostatic latent image, which is then used to form an image in the developer.

[0048] See Figures 4 to 9 In this embodiment of the present invention, the developing assembly includes a developing device, which includes a drum member 100 and a developing member 200 that are detachably connected together. The drum member 100 includes a first housing 110 and a drum member 120 rotatably mounted on the first housing 110. The surface of the drum member 120 is made of a photosensitive material, and when irradiated by laser light, the charge polarity thereof is converted, thereby forming an electrostatic latent image. The developing member 200 includes a second housing 210 and a developing roller 220 rotatably mounted on the second housing 210. The second housing 210 is provided with a chamber (not shown) and a developer outlet 211 connected to the chamber. The chamber stores developer, which is transferred to the surface of the drum member 120 by the developing roller 220. The charge on the surface of the drum member 120 attracts the developer, causing the developer to form an image on the surface of the drum member 120.

[0049] The specific structures of the drum component 100 and the developing component 200 in the embodiment are further described below.

[0050] See Figure 6The drum component 100 further includes a charging roller 130 and a first transmission gear set 140. The first housing 110 includes a mounting body 111 and a support frame 112 extending along a first direction on the mounting body 111. The support frame 112 has a storage space 113 for placing the developing component 200. The charging roller 130 is rotatably mounted on the mounting body 111 and contacts the surface of the drum component 120 to fill the charge onto the drum component 120. The first transmission gear set 140 includes a first gear mounted on the drum component 120 and a second gear mounted on the charging roller 130. The first gear is meshed with the second gear, and when the developing device is mounted on the image forming device, the first gear is meshed with the driving component on the image forming device to receive the driving force. Figures 4 to 9 In the embodiment shown in FIG, the first direction in which the support frame 112 extends relative to the mounting body 111 is the positive direction X of the first direction, so that the developing member 200 is mounted in the positive direction X of the drum member 100 .

[0051] The developing assembly 200 further includes a stirring member (not shown), a powder feed roller (not shown), and a second transmission gear set 240. The stirring member is rotatably disposed within the chamber to push the developer toward the developer outlet 211. The powder feed roller is disposed on the output channel between the developer outlet 211 and the chamber, and its surface contacts the surface of the developing roller 220. After the developer is pushed to the output channel by the stirring member, the powder feed roller transfers the developer to the surface of the developing roller 220, which then delivers the developer to the drum 120. Specifically, the stirring member includes a stirring rod and a stirring blade disposed on the stirring rod. The stirring rod is rotatably disposed on the second housing 210 and is located within the chamber. The stirring blade pushes the developer in the chamber to the output channel.

[0052] In this embodiment, the support frame 112 has a first side and a second side on both sides of the receiving space 113 along the second direction, and a fastener 114 and a notch 115 are provided on the first side and the second side, wherein the fastener 114 is elastically rotatably provided on the support frame 112, and its rotation axis is parallel to the second direction. Specifically, see Figure 5The fastener 114 includes a connecting portion 1141, an extension portion 1142 and an action portion 1143. The connecting portion 1141 is rotatably connected to the support frame 112. The extension portion 1142 extends from the connecting portion 1141. The action portion 1143 is located at a position where the extension portion 1142 is away from the connecting portion 1141. The support frame 112 has a rotating column 1121 for connecting the fastener 114 and a limiting column 1122 for limiting the rotation range of the fastener 114. The rotating column 1121 is provided with an elastic member 117 to enable the fastener 114 to rotate elastically on the support frame 112. The elastic member 117 can be set as a tension spring, and the extension portion 1142 is provided with a limiting arc hole 1142a matched with the limiting column 1122. When the limiting portion is set inside the limiting arc hole 1142a, the fastener 114 is limited to move within a specified angle range, and the action portion 1143 is directed toward the installation body 111 when the developing component 200 is installed on the support frame 112. When the action portion 1143 moves in a direction away from the installation body 111, the elastic force of the elastic member 117 acting on the fastener 114 gradually increases, thereby providing an elastic pre-tightening effect in this direction.

[0053] It should be noted that, see Figures 7 to 9 , the second direction is perpendicular to the first direction, and the second direction in this embodiment is the length direction of the developing member 200 or the drum member 100, specifically as Figure 7 in the direction Y.

[0054] Continue reading Figure 8 The notch 115 opens toward a third direction perpendicular to the first direction and the second direction. Figure 8 In the direction Z, the recess 115 has a buckle position 116 close to the mounting body 111, and the buckle position 116 is arranged on the side of the recess 115 in the opposite direction X' of the first direction and away from the opening of the recess 115, as shown in FIG. Figure 5 As shown, the buckle 116 and the fastener 114 on the corresponding side are arranged opposite to each other in the first direction. The corresponding side refers to the buckle 116 and the fastener 114 on the same side. For example, on the first side, the buckle 116 and the fastener 114 are arranged opposite to each other on the support frame 112, and the same is true on the second side. Therefore, the force applied by the fastener 114 will be in the direction of causing the developing member 200 to move toward the installation body 111 along the first direction for pre-tightening. The second shell 210 is provided with an assembly portion 230 that is adapted to the buckle 116 and the fastener 114. The assembly portion 230 can enter the recess 115 to be assembled with the buckle 116 and the fastener 114. The assembly portion 230 on the corresponding side includes an adapting portion 231 protruding outward away from the second side and a force-bearing portion 232. For details, see Figure 8The adapting portion 231 and the force-bearing portion 232 protrude along the second direction on the second shell 210, and the adapting portion 231 is closer to the developer outlet 211 in the first direction than the force-bearing portion 232. Therefore, the adapting portion 231 is buckled into the buckle position 116, and the force-bearing portion 232 contacts the action portion 1143 of the fastener 114, so that the second shell 210 receives the elastic force from the fastener 114 and approaches the installation body 111 in the opposite direction X' of the first direction, and is fixed on the support frame 112 under the restrictive action of the adapting portion 231 and the buckle position 116.

[0055] During the specific implementation process, when the developing component 200 is installed on the support frame 112, the developer outlet 211 is located in the opposite direction X' of the first direction of the developing component 200, and the developing roller 220 is inside the developer outlet 211 and has a transmission surface that partially protrudes outside the developer outlet 211, and the drum member 120 has a partial outer surface exposed toward the storage space 113 on the mounting body 111. After the developing component 200 is installed on the support frame 112, the transmission surface of the developing roller 220 will contact part of the outer surface of the drum member 120, thereby realizing developer transmission. In combination with the above structure, after the developing member 200 is fixed by the fasteners 114 on the first side and the second side, an elastic force in the opposite direction to the first direction is generated. The elastic force directly acts on the contact surface between the developing member 200 and the drum member 120, so that in the process of transmitting the developer between the developing member 200 and the drum member 120, when the developer layer is too thick, the elastic force will squeeze the developer layer on the surface of the developing roller 220, so that the developer layer meets the thickness requirement and is effectively transmitted to the drum member 120. At the same time, the developing drum is always kept in contact with the drum member 120, thereby avoiding the loosening phenomenon caused by the rigid contact during long-term use and solving the imaging defects caused by the contact.

[0056] In addition, in this embodiment, on the corresponding side of the support frame 112, the adapting portion 231 is adapted to the buckle position 116, and the buckle 114 applies force to the force-bearing portion 232, and the force application point M' is closer to the opening of the recess 115 than the buckle position 116 in the third direction. With such a structural arrangement, the buckle position 116 provides an elastic component force in the first direction to elastically contact the surface of the drum member 120 in the process of locking the assembly portion 230, and also provides a force component force in the third direction to prevent the assembly portion 230 from being loosened. 0 is separated from the force of the notch 115, ensuring that the developing roller 220 does not need to provide an additional locking structure to lock the developing member 200 on the support frame 112. Under this structure, the support rod 118 structure on the back of the developing member 200 on the support frame 112 is cancelled, and the force application point M' of the fastener 114 is located closer to the drum member 120, making the contact between the developing roller 220 and the drum member 120 surface more reliable, shortening the action distance, and avoiding the problem of misalignment caused by the pushing torque process. For example, Figure 1 In the prior art shown, when the force-applying portion is located at the rear end of the developing section facing away from the drum section, the distance between the force-applying point M and the contact point P between the developing roller 220 and the photosensitive drum is too long. Consequently, the errors in the assembly of the various components of the developing section are compounded and amplified. In particular, during the molding process, the overall dimensions of the housing gradually increase due to molding errors. Consequently, the force-applying effect is not as good as the ideal design dimensions, resulting in a significant difference between the elastic effect provided by the force-applying portion to the developing roller 220 and the actual effect. The buckle 116 structure of this embodiment significantly shortens the distance between the force-applying portion and the developing roller 220, thereby ensuring more stable contact between the developing roller 220 and the drum 120, approaching the ideal design effect and improving imaging quality.

[0057] This structural design also has another important design intention. Figure 1 In the prior art, in order to facilitate elastic contact between the developing roller 220 and the drum member 120 when the action distance is long, the force application point M and the axis of the developing roller 220 are connected to form an action line Q, and the contact part between the developing roller 220 and the drum member 120 is located on the action line Q or close to the action line Q, so as to reduce the elastic action error of the force application component causing the developing roller 220 to apply force to the drum member 120. However, under this structural design, a stable contact state cannot be formed between the developing roller 220 and the drum member 120, for example Figure 2 and Figure 3 When the image forming apparatus is subjected to an unexpected state such as impact or shaking, the contact portion P may continuously shake in the upper or lower direction of the action line, thereby causing a loss of stability and resulting in uneven depth of the printed image, thus affecting the image quality. In the structure provided by the embodiment of the present invention, the drum member 120 is in the opposite direction of the first direction of the developing roller 220, and the direction of the force applied by the buckle 116 to the force point M' of the developing member 200 is a fourth direction that is inclined relative to the first direction and the third direction. For details, see Figure 6 It can be seen that the contact position P' between the developing roller 220 and the drum member 120 is not on the action line Q or a position close to the straight line Q. Therefore, even if a shaking impact occurs, or the state is temporarily offset due to its own imaging process, the developing roller 220 will only approach or slightly move away from the drum member 120 in a direction perpendicular to the tangent of the contact position. The direction of the elastic action of the developing roller 220 on the surface of the drum member 120 will not change, and the developing drum always maintains a stable elastic contact with the drum member 120, ensuring the orderly progress of the imaging process and making the image color stable and clear.

[0058] In one embodiment, the assembly portion 230 includes a first assembly portion and a second assembly portion, and the common straight line of the first adapter portion of the first assembly portion and the second assembly portion and the second adapter portion of the second assembly portion is parallel to the second direction, so that the distance between the adapter portion 231 on the first side and the second side and the developing roller 220 is the same. Since the two adapter portions 231 are limiting components of the developing component 200 on the support frame 112, the two adapter portions 231 can effectively ensure that the developing roller 220 is tightly attached to the surface of the photosensitive drum along the length direction.

[0059] In an expandable manner, the first adapter part and the second adapter part are on the rotation axis of the developing roller 220, which can effectively ensure the installation accuracy of the developing roller 220 when the developing component 200 is installed on the support frame 112. Under this structure, the position of the developing roller 220 is the limiting position of the two adapter parts 231 relative to the two buckles 116, which can reduce the influence of the assembly error on the elastic accuracy between the developing roller 220 and the drum member 120 caused by the positioning distance to a minimum, so that the two can have stable contact.

[0060] In another embodiment, the buckle position 116 has a first limiting surface 1161 in a first direction of the adapter portion 231 and a second limiting surface 1162 in a third direction of the adapter portion 231 and facing the opening when the adapter portion 231 is fitted into the buckle position 116. The adapter portion 231 includes an elastic reset portion that contacts the first limiting surface 1161 and the second limiting surface 1162. In this embodiment, the elastic reset portion is used to abut the first limiting surface 1161 and the second limiting surface 1162. The first limiting surface 1161 is used to provide a limiting effect on the elastic component force of the buckle position 116 in the first direction, and the second limiting surface 1162 is used to provide a limiting effect on the elastic component force of the buckle position 116 in the second direction. The limiting effects in these two directions can stabilize the adapter portion 231 in the buckle position 116.

[0061] Specifically, the elastic reset part elastically contacts the first limiting surface 1161 and the second limiting surface 1162. When the developing member 200 is installed on the support frame 112, the elastic supporting force of the elastic reset part in the first direction generated by the first limiting surface 1161 is smaller than the elastic force provided by the fastener 114 in the first direction, and the elastic supporting force in the second direction generated by the second limiting surface 1162 is smaller than the elastic force in the third direction provided by the fastener 114. Therefore, after overcoming the elastic supporting force corresponding to the elastic reset part, the elastic force still has residual elastic force acting on the developing roller 220 to form an elastic acting force, so that the developing roller 220 elastically contacts the surface of the drum member 120, so that the developing roller 220 always maintains contact with the surface of the drum member 120.

[0062] Under this structure, the elastic reset part ensures the stability of the mounting structure of the developing roller 220 relative to the support frame 112 while maintaining the compactness of the fit on the buckle position 116. When the developing roller 220 is intended to separate from the drum member 120 under the action of external impact, the elastic reset part will undergo appropriate deformation under the contact limiting action of the first limiting surface 1161 and the second limiting surface 1162, so that the adapting part 231 is stabilized in the buckle position 116, thereby continuing to maintain the elastic contact stability of the developing roller 220 relative to the drum member 120.

[0063] In one embodiment, on at least one side of the second shell 210, the elastic reset portion includes a connecting end 2311 connected to a fixed portion of the second shell 210 and an elastic segment 2312 extending from the connecting end 2311. The elastic segment 2312 forms a first curved arc surface 2312a at a contact portion with the first limiting surface 1161 and a second curved arc surface 2312b at a contact portion with the second limiting surface 1162. Figure 5 On the first side of the second shell 210, the elastic reset part can be integrally formed on the second shell 210, and the connecting end 2311 is directly connected to the protruding rib on the outer wall of the second shell 210. The elastic section 2312 first extends from the connecting end 2311 in the opposite direction of the third direction, and then bends upward after bending in the first direction and extends in the positive direction of the third direction to form a first bending arc surface 2312a and a second bending arc surface 2312b. The first bending arc surface 2312a and the second bending arc surface 2312b can better provide an elastic deformation effect, and a stable contact structure is formed between the bending arc surface and the corresponding limiting surface, which can effectively maintain the stability of the adapter 231 in the buckle position 116.

[0064] It should be noted that the elastic deformation force formed by the elastic reset part on the first limiting surface 1161 and the second limiting surface 1162 is smaller than the elastic force exerted by the fastener 114 on the force-bearing part 232. Therefore, when the fastener 114 provides sufficient supporting force and the developing member 200 is fixed as a whole in the storage space 113 of the support frame 112, the elastic reset part offsets part of the elastic force and makes the remaining elastic force of appropriate size act on the developing roller 220, so that the elastic contact force between the developing roller 220 and the drum member 120 is not the direct assembly force of the developing member 200 on the support frame 112, thereby ensuring the elastic contact between the developing roller 220 and the surface of the drum member 120 while preventing the contact force from being too large and affecting the developer layer on the surfaces of both, thereby avoiding damaging the developer transmission.

[0065] Continue reading Figure 5The buckle 116 also has a third limiting surface 1163 which is arranged in the third direction of the fitting portion 231 and opposite to the second limiting surface 1162 when the fitting portion 231 is fitted into the buckle 116. The elastic section 2312 also includes a third bent arc surface 2312c in contact with the third limiting surface 1163. The third limiting surface 1163 is combined with the second limiting surface 1162 to adapt the fitting portion 231 to be fixed in the buckle 116 so as to maintain the assembly stability of the developing component 200 on the support frame 112.

[0066] In another embodiment, at least one side of the second housing 210 is Figure 7 and Figure 8 , having a second side that can be implemented as a second shell 210, the elastic reset portion is made of a conductive rubber material and is in electrical contact with the developing roller 220. The conductive rubber material has both conductive properties and elasticity, and can undergo elastic deformation to contact the first limiting portion and the second limiting portion on the buckle 116, so that the adapter 231 is stable in the buckle 116, and the developing roller 220 can also use the conductive properties of the elastic reset portion to connect to the external circuit, so that its surface carries an electric charge to impart the charge to the developer, and further the developer is attracted by the electrostatic latent image when it is transferred to the surface of the drum 120 to form an image.

[0067] In the above two embodiments, corresponding implementation structures may be provided on both the first side and the second side of the second shell 210 , which are not further limited herein.

[0068] In another embodiment, the mounting body 111 has an image output port 1111 disposed on a side facing away from the support frame 112. A portion of the outer surface of the drum member 120 is exposed at the image output port 1111 and output to a transfer component of the image forming device through the image output port 1111. The transfer component may be a transfer belt or a transfer roller 300, see Figure 6 When the transfer component is a transfer roller 300, the transfer roller 300 contacts the drum member 120 at the image output port 1111. At this time, the transfer roller 300 is located in the opposite direction of the first direction of the drum member 120. Therefore, the transfer roller provides an elastic force in the positive direction of the first direction on the surface of the drum member 120. Combined with the structure of the aforementioned embodiment, the developing roller 220 provides an elastic force in the opposite direction of the first direction to the surface of the drum member 120. Therefore, the two forces can offset each other on the drum member 120 to form a stable balancing force, which can ensure the force balance of the drum member 120 and the stable contact between the drum member 120 and the developing roller 220.

[0069] See Figure 5 and Figure 8, different force-bearing parts 232 can be set on the first side and the second side of the second shell body 210. Specifically, the second shell body 210 includes a shell body and an end cover 212 detachably connected to the first side of the shell body in the second direction. The second transmission gear group 240 includes a driving gear 241 for receiving the driving force from the image forming device. The end cover 212 has a protrusion 2121 for accommodating the driving gear 241. The force-bearing part 232 of the adapter 231 on the first side is located on the side of the protrusion 2121 facing away from the developer outlet 211, so that the fastener 114 applies force in the first direction and the third direction; the shell body has a bearing part 213 protruding away from the first side on the second side in the second direction. The force-bearing part 232 of the adapter 231 on the second side is located on the side of the bearing part 213 facing away from the developer outlet 211, which can also enable the fastener 114 to apply force in the first direction and the third direction to make the developing component 200 lean against the mounting body 111. Of course, the force-bearing portion 232 can also be set as other protrusions 2121 on the first side and the second side of the second shell 210, and again no further restrictions are given.

[0070] The developing device provided in an embodiment of the present invention further includes a scanning light inlet formed between the first housing 110 and the second housing 210 and arranged along a second direction. The scanning light inlet is located between the charging roller 130 and the photosensitive drum in the rotational direction of the drum member 120. Thus, in a specific implementation of the developing device provided by the present invention, the drum member 120 rotates in the U direction on the second housing 210, the charging roller 130 causes the surface of the drum member 120 to carry an electric charge, and light emitted by the scanning assembly enters the second housing 210 through the scanning light inlet, forming an electrostatic latent image on the surface of the drum member 120. The developing roller 220 then delivers developer to the drum member 120, and the formed image is finally transferred to a printing medium such as paper via a transfer component on the image output port 1111.

[0071] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Anyone skilled in the art can utilize the above-disclosed practices and technical content to make numerous possible variations and simple substitutions to the present invention without departing from the scope of the present invention, and all such variations and substitutions are within the scope of protection of the present invention.

Claims

1. A developing device, used in an image forming apparatus, comprising a drum member and a developing member, characterized in that: The drum component comprises: The first housing comprises a mounting body and a support frame extending along a first direction on the mounting body, wherein the support frame has a receiving space for accommodating the developing member; a drum member, rotatably mounted on the mounting body; The developing member comprises: a second housing, wherein a cavity for storing developer and a developer outlet communicating with the cavity are provided in the second housing; a developing roller rotatably disposed in the second housing and located on the developer outlet; The support frame has: Fasteners are provided on both sides of the storage space in the second direction, the fasteners are elastically rotatably provided on the support frame and the rotation axis is parallel to the second direction, and the second direction is perpendicular to the first direction; A notch is provided on both sides of the receiving space in the second direction, the notch is open in a third direction perpendicular to the first direction and the second direction and has a buckle position close to the mounting body, the buckle position and the buckle on the corresponding side are arranged opposite to each other in the first direction, and the buckle position is closer to the mounting body than the buckle; The second housing has mounting portions provided on both sides in the second direction, the mounting portions on the corresponding sides including an adapting portion and a force-bearing portion protruding outwardly away from the second housing, the adapting portion being closer to the developer outlet in the first direction than the force-bearing portion; On the corresponding side of the support frame, the adapting portion is adapted in the buckle position, the buckle applies force to the force-bearing portion, and the force application point is closer to the opening of the recess than the buckle position in the third direction; The assembly portion is provided as a first assembly portion and a second assembly portion on both sides of the second shell in the second direction, and a common straight line between the first adapting portion of the first assembly portion and the second adapting portion of the second assembly portion is parallel to the second direction; The buckle position has a first limiting surface in a first direction of the fitting portion and a second limiting surface in a third direction of the fitting portion and facing the opening when the fitting portion is fitted in the buckle position, and the fitting portion includes an elastic reset portion that contacts the first limiting surface and the second limiting surface; In which, on at least one side of the second shell, the elastic reset part includes a connecting end connected to the fixed part of the second shell and an elastic segment bent and extended from the connecting end, and the contact part of the elastic segment with the first limiting surface forms a first bent arc surface and the contact part with the second limiting surface forms a second bent arc surface.

2. The developing device according to claim 1, wherein The first fitting portion and the second fitting portion are on a rotation axis of the developing roller.

3. The developing device according to claim 1, wherein The buckle position further comprises a third limiting surface which is arranged in the third direction of the fitting portion and opposite to the second limiting surface when the fitting portion is fitted in the buckle position, and the elastic section further comprises a third bent arc surface which contacts the third limiting surface.

4. The developing device according to claim 1, wherein On at least one side of the second housing, the elastic restoring portion is made of a conductive rubber material and is in electrical contact with the developing roller.

5. The developing device according to any one of claims 1 to 4, characterized in that: The mounting body has an image output port disposed on a side facing away from the support frame, and a portion of the outer surface of the drum is exposed at the image output port and contacts the transfer component of the image forming device through the image output port.

6. The developing device according to any one of claims 1 to 4, characterized in that: The developing member further includes a transmission gear set, the second housing includes a housing body and an end cover detachably connected to a first side of the housing body in the second direction, the transmission gear set includes a driving gear for receiving a driving force from the image forming device, the end cover has a protrusion for receiving the driving gear, and the force-receiving portion of the assembly portion on the first side is located on a side of the protrusion facing away from the developer outlet; The housing body has a bearing portion protruding away from the first side on the second side in the second direction, and the force receiving portion of the assembly portion on the second side is located on a side of the bearing portion away from the developer outlet.

7. An image forming device, characterized in that: The device comprises an apparatus body and a developing device according to any one of claims 1 to 6 arranged in the apparatus body.

Images