CN219590674U - Developing frame, developing cartridge, process cartridge, and electrophotographic image forming apparatus - Google Patents

Abstract

The utility model provides a developing frame, a developing box, a processing box and an electrophotographic imaging device, wherein the developing frame comprises a powder bin base and a powder bin cover, and a powder bin is formed between the powder bin base and the powder bin cover; the powder bin base is provided with a first groove, the first groove is recessed from the outer side of the powder bin base to the inner side of the powder bin base and forms a first bulge located at a powder outlet of the powder bin, the powder bin cover is provided with a second groove formed at the first bulge, the second groove is recessed from the inner side of the powder bin cover to the outer side of the powder bin cover and forms a second bulge, the first bulge is located in the first groove, one side of the powder bin cover, facing the powder bin base, is provided with a welding groove passing through the second bulge and the second groove, the powder bin cover is provided with a gap avoiding part penetrating through the second bulge and the second groove along the length direction of the developing frame, and the second bulge is located between the powder outlet and the gap avoiding part. The developing cartridge, the process cartridge and the electrophotographic image forming apparatus each include the above-described developing frame, and the developing frame is applicable to a developing roller having a larger diameter and improves the developing effect.

Description

Developing frame, developing cartridge, process cartridge, and electrophotographic image forming apparatus

Technical Field

The present utility model relates to the field of electrophotographic image forming technology, and more particularly, to a developing frame, and a developing cartridge provided with the developing frame, a process cartridge including the developing cartridge, and an electrophotographic image forming apparatus provided with the process cartridge.

Background

An electrophotographic image forming apparatus (e.g., a laser printer) is an apparatus that forms an image on an image forming medium (e.g., paper) by using electrophotographic principles through at least the processes of charging, exposing, developing, transferring, fixing, and cleaning, and a material device of a printing consumable used on the electrophotographic image forming apparatus is generally called a process cartridge.

A process cartridge accommodating chamber of an existing electrophotographic image forming apparatus is provided with a spacing projection, and accordingly, an existing process cartridge of a type that matches the above-described electrophotographic image forming apparatus is provided with a first recess that matches the above-described spacing projection, so that when the process cartridge is mounted into the electrophotographic image forming apparatus, the first recess on the process cartridge can be engaged with the spacing projection in the process cartridge accommodating chamber. As shown in fig. 1, fig. 1 shows a conventional process cartridge 9 adapted to an electrophotographic image forming apparatus of the above-described type, the process cartridge 9 including a developing cartridge 91 and a drum cartridge 92, the developing cartridge 91 being mounted on the drum cartridge 92, and a developing roller 912 of the developing cartridge 91 being abutted against a photosensitive drum 921 of the drum cartridge 92. The developing frame 911 of the developing cartridge 91 generally includes a powder bin base 9111 and a powder bin cover 9112, and referring to fig. 2, the first concave portion 91111 is formed on the powder bin base 9111, the first concave portion 91111 forms a first protrusion 91112 on the inner side of the powder bin base 9111, and the powder bin base 9111 and the powder bin cover 9112 are fixedly connected by welding, in order to ensure tightness after the whole welding between the powder bin base 9111 and the powder bin cover 9112, the powder bin cover 9112 is provided with a second concave portion 91121 at the first concave portion 91111 of the powder bin base 9111, and the second concave portion 91121 forms a second protrusion 91122 on the inner side of the powder bin cover 9112, so that the first protrusion 91112 is located in the second concave portion 91121 and is adjacent to the second concave portion 91121 after the powder bin cover 9112 is assembled with the powder bin base 9111; the position of the weld 91113 between the powder bin cover 9112 and the powder bin base 9111 is shown in fig. 3.

In connection with fig. 4, the above-described process cartridge 9 has the following drawbacks: the second projection 91122 covers the first projection 91112 in an excessively large area, so that the second projection 91122 is excessively large in volume, resulting in a smaller minimum distance L1 between the circumferential surface of the developing roller 912 and the second projection 91122, and therefore, the process cartridge 9 can be applied only to the developing roller 912 (hereinafter referred to as "first developing roller 912") having a smaller diameter (10.2 mm diameter), but the first developing roller 912 is poor in stability, and is easily deformed radially elastically, thereby affecting the developing effect of the process cartridge 9.

Although there is a developing roller 912 (hereinafter referred to as "second developing roller 912") having a large diameter (12 mm diameter) which is widely used in various types of developing cartridges 91 due to a good developing effect, a good stability and a difficulty in elastic deformation, due to the defects of the above-described process cartridge 9 itself, when the second developing roller 912 is mounted in the above-described process cartridge 9, the minimum distance L1 between the circumferential surface of the second developing roller 912 and the second projection 91122 becomes smaller, so that the toner at the second projection 91122 cannot be circulated completely, and the toner at the second projection 91122 is easily accumulated and agglomerated, thereby affecting the image quality; even when the second developing roller 912 is mounted to the above-described process cartridge 9, the circumferential surface second projection 91122 of the second developing roller 912 contacts with each other, so that the second developing roller 912 and the second projection 91122 rub against each other, thereby causing damage to the second developing roller 912, and therefore, the above-described process cartridge 9 cannot be fitted to the second developing roller 912 at present, so that the developing effect of the process cartridge 9 is poor.

Disclosure of Invention

In order to solve the above-described problems, a first object of the present utility model is to provide a developing frame which is applicable to a developing roller having a large diameter and improves a developing effect.

A second object of the present utility model is to provide a developing cartridge provided with the above-described developing frame.

A third object of the present utility model is to provide a process cartridge provided with the above-described developing cartridge.

A fourth object of the present utility model is to provide an electrophotographic image forming apparatus provided with the above process cartridge.

In order to achieve the first object of the utility model, the utility model provides a developing frame, which comprises a powder bin base and a powder bin cover, wherein the powder bin base is provided with a first powder bin cavity, a first groove is formed on the powder bin base, the first groove is recessed from the outer side of the powder bin base to the inner side of the powder bin base, a first bulge is formed on the inner side of the powder bin base in the first groove recess, the powder bin cover is provided with a second powder bin cavity, the powder bin cover is arranged on the powder bin base, the second powder bin cavity and the first powder bin cavity enclose a powder bin, the first bulge is positioned at a powder outlet of the powder bin, the powder bin cover is formed with a second groove at the first bulge, the second groove is recessed from the inner side of the powder bin cover to the outer side of the powder bin cover, the second bulge is formed on the outer side of the powder bin cover, the first bulge is positioned in the first groove, a welding groove is formed on one side of the powder bin cover facing the powder bin base, a part of the second bulge and a part of the second bulge is penetrated along the length direction of the developing frame, the second bulge is positioned between the powder outlet and the first bulge, and the second bulge passes through the second bulge and the second bulge, and the second bulge is positioned in the gap, and the gap is positioned between the second bulge and the second bulge.

From the above, by setting the avoidance space and the optimized design of the first groove, the second groove and the second bulge, when the developing roller is mounted on the developing frame, the minimum distance between the second bulge and the outer peripheral surface of the developing roller is larger than the minimum distance between the bulge (corresponding to the second bulge) on the existing developing frame and the outer peripheral surface of the developing roller, so that the developing frame provided by the utility model can be suitable for the developing roller with larger diameter (such as 12 mm diameter), thereby not only improving the developing effect of the developing box and the processing box provided with the developing frame, but also avoiding the mutual friction between the developing roller and the second bulge and preventing the developing roller from being damaged; meanwhile, the design enables the carbon powder to flow smoothly at the second bulge, so that the carbon powder is prevented from accumulating and agglomerating at the second bulge, and the imaging quality is improved.

The utility model discloses a powder storehouse, a powder storehouse base, a powder storehouse cover, a connecting end shaping that is connected with the powder storehouse base has first turn-ups, the second recess, second arch and bonding wire groove all shape on first turn-ups, the second recess runs through partial first turn-ups, the bonding wire groove is around the circumference in second powder storehouse chamber, bonding wire groove is close to first turn-ups outward flange department setting, bonding wire groove has the section of bending in second recess department, the section of bending has first portion of bending, second portion of bending and connecting portion, first portion of bending, second portion of bending all bend to second powder storehouse chamber, first portion of bending and second portion of bending are located the bellied both ends department of second respectively, the connecting portion passes the second arch, connecting portion respectively with first portion of bending, second portion of bending intercommunication.

From the above, the first flanging provides a setting space for the second groove, the second bulge and the welding wire groove, and the structure of the powder bin cover can be better optimized, so that the volume of the powder bin cover is reduced; and through setting up the section of bending on the welding wire groove for the welding wire groove does not take place to interrupt, and makes powder storehouse lid and powder storehouse base can carry out reliable and closely connect in first protruding and the protruding department of second, and then avoids the powdered carbon in the powder storehouse to take place to leak from this department.

The other preferred scheme is, the powder storehouse lid still has first connection ear and second connection ear, and in length direction, first connection ear and second connection ear are located the both ends department of powder storehouse lid respectively, and first connection ear and second connection ear are located out powder mouth department, and the powder storehouse base still has the development position, forms the development storehouse between first connection ear, second connection ear and the development position, and first arch, second arch all are located the development storehouse.

From the above, the first connection lug and the second connection lug provide installation space for the installation of the developing roller, and the overall design of the developing frame is more reasonable and optimized, and the setting of the developing bin is used for accommodating the developing roller so as to prevent the developing roller from being excessively exposed outside the developing frame, thereby preventing the developing roller from being scratched and damaged.

The further scheme is that partial welding wire grooves are formed in the first connecting lug part and the second connecting lug part, and welding wires matched with the welding wire grooves are arranged on the powder bin base.

From the above, can make first connection ear and second connection ear take place warp with partial welding line groove setting on first connection ear and second connection ear, and then guarantee that the mounted position of developing roller is accurate to and prevent that developing roller from appearing the offset in rotation in-process, thereby guarantee imaging quality.

Still further, the thickness of the second protrusion is between 0.6 mm and 1.5 mm, and the thickness direction of the second protrusion is perpendicular to the length direction.

From the above, through the thickness design to the second arch, both make powder storehouse lid and powder storehouse base can carry out reliable, inseparable connection in first protruding and the protruding department of second, can make the minimum distance between the developing roller of installing on developing frame and the second protruding as far as, thereby make developing frame can be suitable for the developing roller that the diameter is great, with the suitability that improves developing frame and the mobility of carbon dust in the protruding department of second, prevent that the carbon dust from piling up, caking in the protruding department of second, and prevent developing roller and the mutual friction of second.

In order to achieve the second object of the present utility model, the present utility model provides a developing cartridge comprising a developing roller, wherein the developing cartridge further comprises the above-mentioned developing frame, and the developing roller is rotatably mounted on the developing frame about its own rotation axis.

From the above, the developing cartridge provided with the developing frame can be provided with the developing roller with larger diameter (such as 12 mm in diameter), and can improve the fluidity of the carbon powder at the second bulge, prevent the carbon powder from accumulating and agglomerating, and prevent the developing roller from being damaged due to mutual friction with the second bulge.

Further, a minimum distance between the outer circumferential surface of the developing roller and the second projection is greater than or equal to 2.3 mm.

Therefore, after the developing roller with larger diameter is arranged on the developing frame, the carbon powder can still freely circulate at the second bulge without accumulation and caking.

In order to achieve the third object of the present utility model, there is provided a process cartridge comprising a drum frame and a photosensitive drum rotatably mounted on the drum frame about its own rotation axis, wherein the process cartridge further comprises the above-mentioned developing cartridge mounted on the drum frame, the developing roller being abutted against the photosensitive drum.

From the above, the processing box provided with the developing box can be provided with the developing roller with larger diameter (such as 12 mm in diameter), and can improve the fluidity of the carbon powder at the second bulge, prevent the carbon powder from accumulating and agglomerating, and prevent the developing roller from being damaged due to mutual friction with the second bulge.

Further, the process cartridge further comprises a driving force receiving head mounted at the end of the photosensitive drum or at the end of the process cartridge, and the first groove is located at one end of the powder bin base close to the driving force receiving head.

From the above, set up the first recess in the one end department that is close to the driving force receiving head of processing box, can cooperate the spacing arch of the processing box installation intracavity of electrophotographic image forming apparatus to carry out spacing to the processing box, and then prevent that the processing box from jumping in the working process of electrophotographic image forming apparatus to guarantee the imaging quality of electrophotographic image forming apparatus.

In order to achieve the fourth object of the present utility model, there is provided an electrophotographic image forming apparatus including a housing in which a process cartridge mounting chamber is provided, a spacing protrusion is provided in the process cartridge mounting chamber, wherein the process cartridge is mounted in the process cartridge mounting chamber, and the spacing protrusion is engaged with the first groove.

From the above, the electrophotographic image forming apparatus provided with the above process cartridge can have better image quality.

Drawings

Fig. 1 is a structural view of a conventional process cartridge.

Fig. 2 is a structural view of a developing frame of a conventional process cartridge.

Fig. 3 is a block diagram of a powder hopper base of a developing frame of a conventional process cartridge.

Fig. 4 is a sectional view of a conventional process cartridge with a part of the components omitted.

Fig. 5 is a block diagram of an embodiment of a process cartridge of the present utility model.

Fig. 6 is a structural view of a developing cartridge of an embodiment of the process cartridge of the present utility model.

Fig. 7 is a structural view of a developing frame of an embodiment of the process cartridge of the present utility model.

Fig. 8 is a block diagram of a first view of the base of the cartridge of an embodiment of the present utility model.

FIG. 9 is a block diagram of a process cartridge of an embodiment of the present utility model from a second perspective of the base of the cartridge

Fig. 10 is a block diagram of a powder cartridge cover in a first view of an embodiment of the process cartridge of the present utility model.

Fig. 11 is a structural view of the powder hopper cover of the embodiment of the process cartridge of the present utility model at a second perspective.

Fig. 12 is a cross-sectional view of an embodiment of the process cartridge of the present utility model with parts of the components omitted.

The utility model is further described below with reference to the drawings and examples.

Detailed Description

Process cartridge embodiment

Referring to fig. 5, the process cartridge 100 includes a developing cartridge 1, a drum cartridge 2, and a driving force receiving head 3. The drum cartridge 2 includes a drum frame 21 and a photosensitive drum 22, the photosensitive drum 22 is rotatably mounted on the drum frame 21 about its own rotation axis, and the developing cartridge 1 is mounted on the drum frame 21. In the present embodiment, a driving force receiving head 3 is mounted on one end of the photosensitive drum 22, and the driving force receiving head 3 is adapted to interface with a driving head in a mounting chamber of a process cartridge 100 of an electrophotographic image forming apparatus, so that the driving head can drive the driving force receiving head 3 to rotate, thereby driving the related components in the process cartridge 100 to rotate.

Referring to fig. 6 and 7, the developing cartridge 1 includes a developing frame 11, a developing roller 12, a driving pulley group 13, and a stirring frame. The developing frame 11 includes a hopper base 111 and a hopper cover 112, and in combination with fig. 8 and 9, the hopper cover 112 has a first hopper chamber 1111, and a first groove 1112 is formed in the hopper base 111, and the first groove 1112 is preferably disposed at one end of the hopper base 111 near the driving force receiving head 3, so that the first groove 1112 can limit the process cartridge 100 in cooperation with a limit projection in a mounting chamber of the process cartridge 100 of the electrophotographic image forming apparatus, thereby preventing the process cartridge 100 from jumping during operation of the electrophotographic image forming apparatus to ensure the image quality of the electrophotographic image forming apparatus. Wherein, the first groove 1112 faces inward from the outside of the powder bin base 111 (i.e., the side of the powder bin base 111 facing away from the first powder bin cavity 1111) to the inside of the powder bin base 111 (i.e., the side of the powder bin base 111 facing the first powder bin cavity 1111), such that the invagination of the first groove 1112 forms a first protrusion 1113 at the inside of the powder bin base 111. In addition, a developing position 114 is formed on the powder bin base 111, and the developing position 114 is used for accommodating the developing roller 12.

Referring to fig. 10 to 12, the hopper cover 112 has a second hopper cavity 1121, and when the hopper cover 112 is assembled with the hopper base 111, the hopper cover 112 covers the first hopper cavity 1111 to enclose the first and second hopper cavities 1111 and 1121 into a hopper 113, and the hopper 113 is used for storing toner. The powder bin 113 has a powder outlet 1131, and the first protrusion 1113 is located outside the powder bin 113 and at the powder outlet 1131. To ensure the tightness and rationality of the connection between the powder bin cover 112 and the powder bin base 111, the powder bin cover 112 is formed with a second groove 1122 at the first protrusion 1113 to accommodate the first protrusion 1113, and the second groove 1122 is concave inward from the inside of the powder bin cover 112 (i.e., the side of the powder bin cover 112 facing the powder bin base 111) to the outside of the powder bin cover 112 (i.e., the side of the powder bin cover 112 facing away from the powder bin base 111), so that the second groove 1122 forms a second protrusion 1123 on the outside of the powder bin cover 112. In addition, the hopper cover 112 has a clearance space 1124, and the clearance space 1124 penetrates a part of the second projection 1123 and a part of the second groove 1122 in the longitudinal direction of the developing frame 11 (i.e., the axial direction of the developing roller 12) such that the second projection 1123 is located between the powder outlet 1131 and the clearance space 1124, and such that a part of the first projection 1113 is located in the clearance space 1124.

The inner side of the powder bin base 111 is provided with a welding wire 1116, the powder bin base 111 is preferably provided with a second flanging 1115, the second flanging 1115 is positioned at the opening of the first powder bin cavity 1111, and part of the welding wire 1116 is formed on the second flanging 1115; one side of the powder bin cover 112 facing the powder bin base 111 is provided with a welding wire groove 1126 matched with the welding wire 1116, a first flange 1125 is formed at a connecting end (namely, an opening of the second powder bin cavity 1121) of the powder bin base 111 of the powder bin cover 112, a second groove 1122, a second protrusion 1123 and the welding wire groove 1126 are formed on the first flange 1125, and the second groove 1122 penetrates through part of the first flange 1125. Wherein the welding wire groove 1126 surrounds the circumference of the second powder bin cavity 1121, and the welding wire groove 1126 is arranged near the outer edge of the first flange 1125; further, the wire groove 1126 passes through the second protrusion 1123 and the second groove 1122. The arrangement of the first flange 1125 provides an arrangement space for the second groove 1122, the second protrusion 1123 and the welding wire groove 1126, and can better optimize the structure of the powder bin cover 112, and reduce the volume of the powder bin cover 112; similarly, the arrangement of the second flange 1115 improves the arrangement space for the welding wire 1116, optimizes the structure of the powder bin base 111 better, reduces the volume of the powder bin base 111, and the second flange 1115 is used for being matched and connected with the first flange 1125.

Preferably, the second projection 1123 has a thickness W of between 0.6 mm and 1.5 mm, the second projection 1123 has a thickness W direction perpendicular to the length direction of the developing frame 11, and the thickness W direction is parallel to one radial direction of the developing roller 12. By designing the thickness W of the second protrusion 1123, the minimum distance L2 between the developing roller 12 mounted on the developing frame 11 and the second protrusion 1123 is maximized as much as possible on the premise of ensuring that the powder hopper cover 112 and the powder hopper base 111 can be tightly and reliably connected at the first protrusion 1113 and the second protrusion 1123, so that the developing frame 11 can be applied to the developing roller 12 with a larger diameter (such as 12 mm diameter), thereby improving the adaptability of the developing frame 11 and the flowability of the toner at the second protrusion 1123, preventing the toner from accumulating and agglomerating at the second protrusion 1123, and preventing the developing roller 12 and the second protrusion 1123 from rubbing against each other. The minimum distance L2 between the outer peripheral surface of the developing roller 12 and the second protrusion 1123 is preferably greater than or equal to 2.3 mm, so as to ensure that the toner can still freely circulate at the second protrusion 1123 without accumulation and caking after the developing roller 12 with a larger diameter is mounted on the developing frame 11.

Accordingly, to match the optimal design of the second groove 1122 and the second protrusion 1123 on the powder bin cover 112, the wire groove 1126 is provided with a bent section 11260 at the second groove 1122. The bending section 11260 has a first bending portion 11261, a second bending portion 11262 and a connecting portion 11263, the first bending portion 11261 and the second bending portion 11262 are both bent toward the second powder chamber 1121, and the first bending portion 11261 and the second bending portion 11262 are respectively located at two ends of the second protrusion 1123; the connection portion 11263 passes through the second protrusion 1123, and the connection portion 11263 communicates with the first bent portion 11261 and the second bent portion 11262, respectively. By providing the bent section 11260 on the wire bonding groove 1126, the wire bonding groove 1126 is not interrupted, and the powder bin cover 112 and the powder bin base 111 can be reliably and tightly connected at the first protrusion 1113 and the second protrusion 1123, so that the leakage of the carbon powder in the powder bin 113 from the position is avoided. In addition, the welding wire 1116 on the powder bin base 111 is correspondingly formed with a second bending section 11260 matched with the bending section 11260 of the welding wire groove 1126 at the bending section 11260 of the welding wire groove 1126, so that the tightness and the reliability of the connection between the powder bin cover 112 and the powder bin base 111 are ensured.

Furthermore, the hopper cover 112 further has a first connecting ear 1127 and a second connecting ear 1128, the first connecting ear 1127 and the second connecting ear 1128 are located at both ends of the hopper cover 112, respectively, in the longitudinal direction of the developing frame 11, and the first connecting ear 1127 and the second connecting ear 1128 are located at the outlet 1131. A developing hopper is formed between the first connecting ear 1127, the second connecting ear 1128 and the developing position 114, the developing roller 12 is rotatably mounted on the first connecting ear 1127 and the second connecting ear 1128 about the rotation axis thereof, and a part of the developing roller 12 is located in the developing hopper, and the developing roller 12 abuts against the photosensitive drum 22 after the developing cartridge 1 is mounted on the drum frame 21. In addition, first projection 1113, second recess 1122, and second projection 1123 are also located within the developer cartridge. The first connecting lug 1127 and the second connecting lug 1128 provide an installation space for the installation of the developing roller 12, and the overall design of the developing frame 11 is more reasonable and optimized, and the arrangement of the developing bin can prevent the developing roller 12 from being excessively exposed outside the developing frame 11, thereby preventing the developing roller 12 from being scratched and damaged.

Preferably, a part of welding wire grooves 1126 are formed on the first connecting lug 1127 and the second connecting lug 1128, and welding wires 1116 matched with the welding wire grooves 1126 on the first connecting lug 1127 and the second connecting lug 1128 are correspondingly formed on the powder bin base 111 at the positions of the first connecting lug 1127 and the second connecting lug 1128, so that the tightness of the connection between the powder bin cover 112 and the powder bin base 111 is ensured. In addition, the arrangement of the partial bonding wire grooves 1126 on the first and second connecting ears 1127, 1128 also enables the first and second connecting ears 1127, 1128 to warp and deform, thereby ensuring the accuracy of the mounting position of the developing roller 12 and preventing the developing roller 12 from being displaced during rotation, thereby ensuring the image quality.

The stirring frame is rotatably mounted on the powder bin cover 112 around the rotation axis of the stirring frame, and is positioned in the powder bin 113, the stirring frame is used for stirring the carbon powder in the powder bin 113 to prevent the carbon powder from agglomerating, and the stirring frame is also used for stirring the carbon powder in the powder bin 113 to the position of the powder outlet 1131 so as to uniformly convey the carbon powder to the developing roller 12. The driving pulley group 13 is mounted on one end of the developing frame 11 near the driving force receiving head 3, the driving pulley group 13 is connected with the stirring frame and the developing roller 12, respectively, and the driving pulley group 13 is also meshed with the driving force receiving head 3, so that when the driving head in the electrophotographic image forming apparatus drives the driving force receiving head 3 to rotate, the driving force receiving head 3 can drive the developing roller 12 and the stirring frame to rotate through the driving pulley group 13.

It should be noted that, in other embodiments, the driving force receiving head 3 may also be disposed on the first end of the developing frame 11, and the driving force receiving head 3 may rotate around its own rotation axis, and further, a photosensitive drum gear is added to the end of the photosensitive drum 22, so that the photosensitive drum gear is engaged with the driving force receiving head 3, so that the driving force receiving head 3 may drive the photosensitive drum 22 to rotate through the photosensitive drum gear.

When the process cartridge 100 operates, the agitator uniformly conveys toner to the developer hopper around the axial direction of the developer roller 12, and the toner conveyed to the initial position of the developer hopper flows to the developer hopper through the gap between the toner hopper 113 and the developer roller 12 or is directly adsorbed to the surface of the developer roller 12, so that the developer roller 12 can continuously and uniformly convey the toner to the surface of the photosensitive drum 22 for latent image printing, thereby realizing printing of the process cartridge 100.

As can be seen from the above, by providing the avoidance space 1124 and the optimized design of the first groove 1112, the second groove 1122, and the second protrusion 1123, when the developing roller 12 is mounted on the developing frame 11, the minimum distance between the second protrusion 1123 and the outer circumferential surface of the developing roller 12 is larger than the minimum distance between the protrusion (corresponding to the second protrusion 1123) on the existing developing frame 11 and the outer circumferential surface of the developing roller 12, so that the developing frame 11 provided by the present utility model can be applied to the developing roller 12 with a larger diameter (for example, a diameter of 12 mm), thereby not only improving the developing effect of the developing cartridge 1 and the process cartridge 100 provided with the developing frame 11, but also avoiding the mutual friction between the developing roller 12 and the second protrusion 1123, and preventing the developing roller 12 from being damaged; meanwhile, the above design also makes the flow of the carbon powder at the second bulge 1123 smoother, so as to prevent the carbon powder from accumulating and caking at the second bulge 1123 and improve the imaging quality.

Electrophotographic image forming apparatus embodiment

The electrophotographic image forming apparatus includes a casing in which a process cartridge mounting chamber is provided, a spacing projection is provided in the process cartridge mounting chamber, and the process cartridge in the above-described process cartridge embodiment is mounted in the process cartridge mounting chamber, the spacing projection being engaged with the first groove. It can be seen that the electrophotographic image forming apparatus provided with the above-described process cartridge can have better image quality.

Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the utility model, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the utility model, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the utility model.

Claims (10)

1. A developing frame including

The powder bin base is provided with a first powder bin cavity, a first groove is formed in the powder bin base, the first groove is recessed from the outer side of the powder bin base to the inner side of the powder bin base, and a first bulge is formed in the first groove recessed position on the inner side of the powder bin base;

the powder bin cover is provided with a second powder bin cavity, the powder bin cover is arranged on the powder bin base, the second powder bin cavity and the first powder bin cavity enclose a powder bin, the first protrusion is positioned at a powder outlet of the powder bin, the powder bin cover is provided with a second groove formed at the first protrusion, the second groove is recessed from the inner side of the powder bin cover to the outer side of the powder bin cover, the second groove recessed is formed at the outer side of the powder bin cover to form a second protrusion, the first protrusion is positioned in the first groove, and one side of the powder bin cover facing the powder bin base is provided with a welding wire groove;

the method is characterized in that:

the powder bin cover is provided with a clearance gap, the clearance gap penetrates through part of the second protrusions and part of the second grooves along the length direction of the developing frame, the second protrusions are located between the powder outlet and the clearance gap, part of the first protrusions are located in the clearance gap, and the welding line grooves pass through the second protrusions and the second grooves.

2. The developing frame according to claim 1, wherein:

the connecting end of the powder bin cover, which is connected with the powder bin base, is provided with a first flanging, the second groove, the second bulge and the welding wire groove are all formed on the first flanging, and the second groove penetrates through part of the first flanging;

the welding wire groove surrounds in the circumference of second powder storehouse chamber, the welding wire groove is close to first turn-ups outward flange department sets up, the welding wire groove is in second recess department has the section of bending, the section of bending has first bending portion, second bending portion and connecting portion, first bending portion the second bending portion all to the second powder storehouse chamber is bent, first bending portion with the second bending portion is located respectively the bellied both ends department of second, connecting portion pass the second is protruding, connecting portion respectively with first bending portion, second bending portion intercommunication.

3. The developing frame according to claim 1, wherein:

the powder bin cover is further provided with a first connecting lug and a second connecting lug, the first connecting lug and the second connecting lug are respectively positioned at two ends of the powder bin cover in the length direction, and the first connecting lug and the second connecting lug are positioned at the powder outlet;

the powder bin base is further provided with a developing position, a developing bin is formed between the first connecting lug part and the second connecting lug part, and the first protrusions and the second protrusions are all located in the developing bin.

4. A developing frame according to claim 3, wherein:

part of the welding wire grooves are formed on the first connecting lug part and the second connecting lug part;

and welding wires matched with the welding wire grooves are arranged on the powder bin base.

5. The developing frame according to any one of claims 1 to 4, wherein:

the thickness of the second bulge is between 0.6 mm and 1.5 mm, and the thickness direction of the second bulge is perpendicular to the length direction.

6. A developing cartridge comprising a developing roller, characterized by further comprising the developing frame according to any one of the preceding claims 1 to 5, the developing roller being rotatably mounted on the developing frame about its own rotation axis.

7. The developing cartridge according to claim 6, wherein:

the minimum distance between the outer peripheral surface of the developing roller and the second projection is greater than or equal to 2.3 mm.

8. A process cartridge comprising a drum frame and a photosensitive drum rotatably mounted on the drum frame about its own rotation axis, characterized in that the process cartridge further comprises the developing cartridge according to claim 6 or 7 mounted on the drum frame, the developing roller being abutted against the photosensitive drum.

9. A process cartridge according to claim 8, wherein:

the process cartridge further includes a driving force receiving head mounted at an end of the photosensitive drum or at an end of the process cartridge, and the first recess is located at an end of the cartridge base close to the driving force receiving head.

10. An electrophotographic image forming apparatus comprising a housing in which a process cartridge mounting chamber is provided, a spacing projection is provided in the process cartridge mounting chamber, wherein the process cartridge as claimed in claim 8 or 9 is mounted in the process cartridge mounting chamber, and the spacing projection is engaged with the first recess.