WO2013017072A1

WO2013017072A1 - Developer assembly and development cartridge

Info

Publication number: WO2013017072A1
Application number: PCT/CN2012/079418
Authority: WO
Inventors: 范文燚
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2011-08-02
Filing date: 2012-07-31
Publication date: 2013-02-07
Also published as: CN102262376A

Abstract

Discloses in the invention are a developer assembly (1) and a development cartridge (20) for a laser imaging device. The development cartridge (20) is composed of the developer assembly (1) and the drum assembly (7) in a detachable manner. The developer assembly (1) comprises a developer assembly framework (2) and a developing roller (4). The framework (2) is provided with a third sidewall (21), a fourth sidewall (22) and a rear wall (23) which can be pushed and pressed by a pushing and pressing column (101) disposed at the inner side of a machine cover. The third sidewall(21) and the fourth sidewall(22) are respectively provided with the guide poles (211,221) which can cooperate with the positioning guide grooves (731) on the sidewall of the drum assembly (7). The rear portion of the third sidewall (21) and/or the fourth sidewall (22) is equipped with a protrude portion used for supporting on a drum assembly handle (75). The rear wall (23) is provided with a position restricting rib (231,232) which can cooperate with the pushing and pressing column (101) to restrict the developer assembly (1) to move upwards.

Description

Developer component and developing cartridge

The present invention relates to a developer assembly, and further relates to a developing cartridge applied to a laser image forming apparatus which is a combination of a developer assembly and a drum assembly. The present application claims priority to Chinese Patent Application No. 201110220048.X, entitled "Developer Component and Developing Cartridge", filed on August 2, 2011, the entire contents of which is incorporated herein by reference. .

In a laser image forming apparatus such as a laser printer, a developing cartridge as a consumable member is generally provided, and the developing cartridge applies a developer to an electrostatic latent image formed on the photosensitive drum for development, and the developer consumed by the developing is used in the developing cartridge. Powder bins are available. The above developing cartridge is generally composed of a drum assembly equipped with a photosensitive drum and a developer assembly equipped with a developing roller and a powder cartridge, wherein the drum assembly and the developer assembly can be sold separately for the purpose of service life, so that the user is in use The drum assembly or the developer assembly can be purchased by itself according to the needs of the user. Such a developing cartridge is generally called a split developing cartridge.

U.S. Patent Specification No. 7,305,204 discloses a split type developing cartridge having a guide post disposed on each of the front side upper portions of the two side walls of the developer assembly, and a lower portion of the rear side of the second side wall of the developer assembly a guiding column, each of which is provided with a rotatable pin-shaped roller; a front side of the two side walls of the drum assembly is distributed with a guiding groove, and a lower portion of the rear side of the second side wall of the drum assembly is distributed with a positioning Guide groove. During the assembly process, the pin-shaped rollers on each of the guiding columns respectively enter the corresponding positioning guide grooves to complete the cooperation of the drum assembly and the developer assembly, and the user can complete the assembly process by a simple operation. In commercially available drum assemblies of similar construction, different types of drum assemblies of the same series are typically identified with a different number of positioning guides, and the corresponding developer assembly employs a corresponding number of guide posts. The drum assembly embodiment disclosed in the above patent specification adopts three positioning guide grooves, and the corresponding developer assembly adopts three guide columns; a drum assembly having four positioning guide grooves also appears in a commercially available product. The corresponding developer assembly must also employ four guide posts. In this way, with the increase and change of different types of drum components, the structure of the developer assembly frame also needs to change, resulting in an increase in the cost of production, storage and transportation. Therefore, one design for the different types of drum components of the same series is designed. A versatile developer component is especially important.

A first object of the present invention is to provide a developer assembly having a simple structure and high versatility to reduce the manufacturing cost thereof.

A second object of the present invention is to provide a developing cartridge comprising the above developer assembly.

In order to achieve the above first object, the present invention provides a developer assembly that can be detachably mounted in combination with a drum assembly and applied to a laser image forming apparatus, the inside of the cover of the laser image forming apparatus having a a developer assembly that presses against a push column of the drum assembly, the drum assembly including a drum assembly frame and a photosensitive drum, the drum assembly frame having a first side wall, a second side wall, and a connection between the two side walls a drum assembly handle, the photosensitive drum is rotatably supported between the first side wall and the second side wall, the first side wall has a first positioning guide groove, and the second side wall has a first a positioning guide groove; the developer assembly comprising: a developer assembly frame with a powder bin, the frame having a third side wall, a fourth side wall, and a rear wall pressable by the pressing column; rotatable a developing roller supported between the third side wall and the fourth side wall; the third side wall is provided with a first guiding post engageable with the first positioning guiding groove, the fourth side a second guiding post engageable with the second positioning channel; a rear portion of the three side walls and/or the fourth side wall having a protrusion for supporting on the handle of the drum assembly; the rear wall having a cooperation with the push column to limit the developer assembly Limiting ribs for upward movement.

Since the rear side guide posts for introducing the positioning guide grooves in the prior art are eliminated on the two side walls of the above developer assembly, the protrusions formed at the rear of at least one side wall of the developer assembly are used instead. The portion can be supported on the handle of the drum assembly; at the same time, a limiting rib is arranged on the rear wall of the developer assembly, and the limiting rib can cooperate with the pushing column on the inner side of the cover of the laser image forming device to limit the developer assembly upward motion. In this way, not only the structure is simplified, the material is saved, the cost is reduced, and more importantly, the versatility of the developer assembly is improved by such an improvement, so that it can be compatible with various drum modules of different models of the same series, thereby achieving Reduce the product development cycle and reduce manufacturing costs.

A further technical solution is that when the developer assembly is mounted to the drum assembly, the protruding portion rides on a top surface of the handle of the drum assembly, and the position of the limiting rib is higher than the top surface and Below the push column. The solution enables the developer assembly to be locked in a locked state when the cover is closed. When the cover is opened, the locking state of the developer assembly can be unloaded at the same time, and the developer assembly can be easily taken out.

The first guiding column and the second guiding column are respectively located at the front upper portions of the third side wall and the fourth side wall, and the first guiding column and the second guiding column are located on the same axis, the axis is parallel to the The axis of the developing roller. This structure allows the developing roller of the developer assembly to contact the photosensitive drum in parallel and uniformly.

The first guiding post includes a first strut integrally connected with the third side wall and a first end cap removably tightly fitted to an outer end of the first strut; the second guiding post includes the The fourth side wall is integrally connected to the second pillar and the second end cap is detachably fitted to the outer end of the second pillar. This configuration allows the developer assembly frame to function in a versatile manner by combining different end caps to assemble various developer components for use with different drum assemblies.

The first end cap forms a tight fit with the non-circular cross-section pin formed at the outer end of the first strut through a non-circular hole; the second end cap passes through the non-circular hole and the non-circular end formed at the outer end of the second strut The round section pin forms a tight fit. Preferably, the non-circular hole is a D-shaped hole, and the non-circular cross-section pin is a D-shaped cross-section pin. This structure can limit the axial rotation of the end cap, ensuring stable assembly and smoothing of the developer assembly.

A further technical solution is that the developer assembly is provided with a driving gear set on one side wall of the developer assembly frame, the roller core of the developing roller has a driving end close to the driving gear set and away from the Driving a non-drive end of the gear set; the non-drive end of the roll core is supported on a side wall of the developer assembly frame by a roll core support, and the non-drive end is provided with a card on the outer side of the roll core support a slot, the card slot is provided with a circlip for restricting the axial movement of the roller core holder along the roller core. This structure can restrict the developing roller from coming out in the axial direction and keep the developing roller stably rotated.

In order to achieve the above second object, the present invention provides a developing cartridge for a laser image forming apparatus which is formed by detachably combining a developer assembly and a drum assembly, the inside of the cover of the laser image forming apparatus having Pressing the developer assembly against a push column of the drum assembly;

The drum assembly includes a drum assembly frame and a photosensitive drum, the drum assembly frame having a first side wall, a second side wall, and a drum assembly handle connecting the two side walls, the photosensitive drum being rotatably supported at the Between the first side wall and the second side wall, the first side wall has a first positioning guide groove, and the second side wall has a second positioning guide groove;

The developer assembly includes: a developer assembly frame with a powder bin, the frame having a third side wall, a fourth side wall, and a rear wall pressable by the push column; rotatably supported on the a developing roller between the third side wall and the fourth side wall; the third side wall is provided with a first guiding post engageable with the first positioning guiding groove, and the fourth side wall is provided with a second guide post that cooperates with the second positioning guide; a rear portion of the third side wall and/or the fourth side wall has a protrusion for supporting on the handle of the drum assembly; the rear wall has A limit rib that can move the developer assembly upward can be restrained by cooperation with the push column.

According to a further technical solution, the first guiding column and the second guiding column are respectively located at a front upper portion of the third side wall and the fourth side wall, and the first guiding column and the second guiding column are located on the same axis. The axis is parallel to the axis of the developing roller; the first guiding post includes a first leg integrally connected with the third side wall and a first end cap removably fitted to the outer end of the first leg The second guiding post includes a second leg integrally connected to the fourth side wall and a second end cap removably fitted to the outer end of the second leg.

A further technical solution is that the developer assembly is provided with a driving gear set on one side wall of the developer assembly frame, the roller core of the developing roller has a driving end close to the driving gear set and away from the driving a non-drive end of the gear set; the non-drive end of the roll core is supported on a side wall of the developer assembly frame by a roll core support, and the non-drive end is provided with a card slot on the outer side of the roll core support A retaining spring for restricting movement of the roller core holder along the axial direction of the roller core is disposed in the card slot.

Since the rear side guide post for introducing the positioning guide groove in the prior art is eliminated on both side walls of the developer assembly in the above developing cartridge, the protrusion formed at the rear of at least one side wall of the developer assembly is employed instead. The protrusion can be supported on the handle of the drum assembly; at the same time, a limiting rib is arranged on the rear wall of the developer assembly, and the limiting rib can be restrained by engaging with the pushing column on the inner side of the cover of the laser imaging device The developer assembly moves upward. In this way, not only the structure is simplified, the material is saved, the cost is reduced, and more importantly, the versatility of the developer assembly is improved by such an improvement, so that it can be compatible with various drum modules of different models of the same series, thereby achieving Reduce the product development cycle and reduce manufacturing costs.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a developing cartridge of the present invention as seen from the left rear side.

Figure 2 is a schematic view showing the separated state of the developing cartridge shown in Figure 1 as seen from the left rear.

Figure 3 is a schematic view showing the separated state of the developing cartridge shown in Figure 1 as viewed from the right front side.

4 is a schematic view showing the cooperation of the developing cartridge shown in FIG. 1 with a cover in a laser image forming apparatus.

Figure 5 is a cross-sectional view taken along line A-A of the structure shown in Figure 4;

Figure 6 is a cross-sectional view taken along line B-B of the structure shown in Figure 4;

Figure 7 is a perspective view of the drum assembly of the developing cartridge shown in Figure 1.

Figure 8 is a perspective view of the developer cartridge of the developing cartridge shown in Figure 1 as seen from the left rear.

Figure 9 is a partial enlarged view of C of Figure 8.

Figure 10 is a perspective view of the developer assembly shown in Figure 8 as viewed from the front right side.

Figure 11 is a partial enlarged view of D of Figure 10 .

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. For convenience of description, the orientation principle of each component hereinafter is: as shown by the coordinate arrows in FIGS. 1 and 3, when the developing cartridge 20 is incorporated in the laser image forming apparatus, the side facing the operator is the rear side, which The opposite side is the front side; when viewed from the rear side to the front side, it serves as a reference for the left and right.

Referring to FIGS. 1 to 6, the developing cartridge 20 is detachably assembled from the developer assembly 1 and the drum assembly 7 and mounted for application in a laser image forming apparatus (only the cover portion is shown in the drawing), for example, a laser. Printer, copier or all-in-one. The inside of the cover 10 of the laser image forming apparatus has a pressing column 101 for pressing the developer assembly 1 toward the drum unit 7.

Referring to Fig. 7, the drum assembly 7 includes a drum assembly frame 71, a photosensitive drum 72, a charger, a cleaning member, and the like, the drum assembly frame 71 having a left side wall 73, a right side wall 74, and a drum assembly connecting the two side walls. The handle 75 and the waste toner box 76 for waste toner recovery are rotatably supported between the left side wall 73 and the right side wall 74. After the photosensitive drum 72 is uniformly charged by the charger and exposed to the illumination of the optical system of the laser image forming apparatus, an electrostatic latent image can be formed on the surface of the photosensitive drum 72; the electrostatic latent image is further developed by the developing roller 4 which will be mentioned later. Forming the developer image, the developer image is transferred onto the paper medium; then, the transferred developer image is thermally fixed on the paper by the fixing member; after the image is transferred, the waste toner remaining on the surface of the photosensitive drum is recovered by the cleaning member To the waste toner box 76. The left side wall 73 of the drum assembly frame 71 has an upper positioning guide 731 and a lower positioning guide 732 (without mating relationship with the developer assembly 1, which may be omitted), symmetrical to the left side wall 73, in the drum assembly The right side wall 74 of the frame 71 also has an upper positioning channel and a lower positioning channel. As for the upper positioning guide 731, one end has an opening and the other end is closed, and has a flat bottom 733 and a circular arc-shaped rear end portion 734 at the closed end. In addition, an opening 736 is provided in the left side wall 73 for the drive head of the laser imaging apparatus to pass through.

Referring to FIGS. 8 to 11, the developer assembly 1 includes a developer assembly frame 2, a powder feed roller 3, a developing roller 4, a powder discharging blade 5, a stirring frame 9, and the like, and the developer assembly frame 2 has oppositely disposed left side walls. 21. A right side wall 22 and a bottom wall, a top wall and a rear wall 23 connecting the two side walls. The inside of the developer assembly frame 2 is mainly divided into two parts, a powder bin and a developing chamber, wherein the powder bin is used for storing the developing developer, and the stirring rack 9 is disposed in the powder bin for stirring the developer; the powder feeding roller 3; The developing roller 4 and the powder discharging blade 5 are disposed in the developing chamber, wherein the powder feeding roller 3 and the developing roller 4 are rotatably supported between the left side wall 21 and the right side wall 22, and a part of the surface of the developing roller 4 is exposed. On the outside. A pressing contact is formed between the powder feeding roller 3 and the developing roller 4, and the powder feeding roller 3 supplies the developer supplied from the powder magazine to the developing roller 4 by rotation, and the powder discharging blade 5 is used to adjust the thickness of the developer layer on the surface of the developing roller 4. . A drive gear set 6 is disposed on the left side wall 21 of the developer assembly frame 2, and the drive gear set 6 is engaged with a drive head (not shown) of the laser image forming apparatus by a drive engagement member 61 to receive a driving force, and then the laser is applied The driving force input by the image forming apparatus is transmitted to the agitating frame, the powder feeding roller 3, and the developing roller 4 through the respective gears of the driving gear set 6.

The developer assembly 1 is provided with a left guide post 211 at the front upper portion of the left side wall 21, and a right guide post 221, a left guide post 211 and a right guide post 221, which are also provided at the front upper portion of the right side wall 22 corresponding thereto. Located on the same axis, and the axis is parallel to the axis of the developing roller 4. The distance between the left guide post 211 and the right guide post 221 to the bottom wall of the developer assembly 1 is substantially equal, and the distance is further than the distance from the developing roller 4 to the bottom wall of the developer assembly 1.

The left guiding post 211 includes a left strut 212 integrally connected with the left side wall 21 and a left end cap 213 detachably fitted to the outer end of the left strut 212. The left end cap 213 is formed in the left post 212 through the D-shaped hole. The outer end D-section pin 214 forms a tight fit. Similarly, the right guiding column 221 also includes a right pillar integrally connected with the right side wall 22 and a right end cap that is detachably fitted to the outer end of the right pillar. The right end cap is formed outside the right pillar through the D-shaped hole. The D-section pin of the end forms a tight fit.

The left side wall 21 and the rear side of the right side wall 22 of the developer assembly 1 respectively have a left protrusion 215 and a right protrusion 225 for supporting on the drum assembly handle 75, and in other embodiments, may be only left The protrusion is provided at the rear of one of the side wall 21 and the right side wall 22. The rear wall 23 of the developer assembly 1 has a left limit rib 231 and a right limit rib 232 which can be engaged with the push column 101 on the inner side of the laser image forming apparatus cover 10 to restrict the upward movement of the developer assembly 1. When the developer assembly 1 is mounted to the drum assembly 7, the left projection 215 and the right projection 225 lie on the top surface 751 of the drum assembly handle 75, and the left limit rib 231 and the right limit rib 232 are positioned higher than The top surface 751 is lower than the push column 101. Since the left side wall 21 and the right side wall 22 of the above-described developer assembly 1 are eliminated from the prior art for guiding the rear side guide post in the positioning guide groove of the drum assembly 7, the use of the developer assembly 1 is employed instead. a protrusion at the rear of the at least one side wall, the protrusion being supported on the drum assembly handle 75; and at the same time, a limiting rib is provided on the rear wall of the developer assembly 1, and the limiting rib can pass through the laser The push column 101 on the inner side of the image forming apparatus cover cooperates to restrict the upward movement of the developer assembly 1. In this way, not only the structure is simplified, the material is saved, the cost is reduced, and more importantly, the versatility of the developer assembly is improved by such an improvement, so that it can be compatible with various drum modules of different models of the same series, thereby achieving Reduce the product development cycle and reduce manufacturing costs.

Referring to Fig. 10, the developer assembly 1 is not provided with a drive gear set 6 on the left side wall 21 as shown in Fig. 8 on the right side wall 22 of the developer assembly frame 2, and the roll core of the developing roller 4 has a drive core group close thereto. a drive end of 6 and a non-drive end remote from the drive gear set 6; the non-drive end 41 of the roll core of the developing roller 4 is supported on the right side wall 22 of the developer assembly frame 2 by a roll core holder 42 preferably made of a conductive metal The non-driving end 41 is provided with a card slot on the outer side of the roll core holder 42. The card slot is provided with a retaining spring 43 for restricting the axial movement of the roll core support 42 along the axial direction of the roll core.

When the above-described developer assembly 1 is assembled with the drum assembly 7, the left guide post 211 on the left side wall 21 of the developer assembly 1 is introduced into the upper positioning guide 731 of the left side wall 73 of the drum assembly 7 through the left end cap 213, And finally positioned at the closed end of the upper positioning guide 731; correspondingly, the right guide post 221 on the right side wall 22 of the developer assembly 1 is also guided to the upper position of the right side wall 74 of the drum assembly 7 through the right end cap. In the slot and positioned at the closed end of the upper positioning channel. The projections of the rear left and right side walls of the developer assembly 1 are supported by the self-weight of the developer assembly 1 while the left and right guide posts of the developer assembly 1 are introduced into the positioning guide grooves of the drum assembly 7 and positioned at their closed ends. On the top surface of the drum assembly handle 75; at the same time, the limiting rib on the rear wall of the developer assembly 1 restricts the upward movement of the developer assembly 1 by cooperating with the pressing column 101 on the inner side of the cover of the laser image forming apparatus, thereby realizing The positioning of the developer assembly 1 on the drum assembly 7 and within the laser imaging device. The drive head of the laser image forming apparatus can pass through an opening 736 on the left side wall 73 of the drum assembly 7 and cooperate with the drive engaging member 61 of the developer assembly 1 to drive the respective rotating members on the developer assembly 1 and the drum assembly 7.

The above description is only a preferred embodiment of the present invention, and the partial structure of the developer assembly or the drum assembly may be improved or replaced without departing from the inventive concept. For example, the two side walls of the drum assembly may each have Only one positioning guide groove is provided, and the cooperation between the end cap of the guiding post and the stud is not limited to the D-shaped cross section, and a non-circular cross section such as a triangle, a square, an ellipse or the like may be adopted as long as it can prevent mutual rotation. Embodiments like this are all within the scope of protection of the present invention.

The developer assembly and developing cartridge of the present invention can be manufactured and used industrially. The invention not only simplifies the structure, saves materials and reduces the cost, but more importantly, improves the versatility of the developer component by being improved, so that it can be compatible with various drum modules of different models in the same series, thereby reducing product development. Production cycle, reducing manufacturing costs. Therefore, the present invention has industrial applicability.

Claims

a developer assembly that can be detachably mounted in combination with a drum assembly and applied to a laser imaging apparatus having a press inside of the cover of the laser imaging apparatus for pressing the developer assembly toward the drum assembly a drum assembly comprising a drum assembly frame and a photosensitive drum, the drum assembly frame having a first side wall, a second side wall, and a drum assembly handle connecting the two side walls, the photosensitive drum being rotatably supported at Between the first side wall and the second side wall, the first side wall has a first positioning guide groove, and the second side wall has a second positioning guide groove; the developer component comprises:

a developer assembly frame having a powder bin having a third side wall, a fourth side wall, and a rear wall pressable by the push column;

a developing roller rotatably supported between the third side wall and the fourth side wall;

The first side wall is provided with a first guiding post that can cooperate with the first positioning guiding groove, and the fourth side wall is provided with a second guiding that can cooperate with the second positioning guiding groove. a post; the rear portion of the third side wall and/or the fourth side wall has a protrusion for supporting on the handle of the drum assembly; the rear wall has a rear wall that is engageable with the push column to limit The limiting rib of the developer component moving upward.
A developer assembly according to claim 1, wherein said projection is placed on a top surface of said drum assembly handle when said developer assembly is mounted to said drum assembly, said limiting rib The position is higher than the top surface and lower than the push column.
The developer assembly according to claim 1, wherein said first guide post and said second guide post are respectively located at a front upper portion of said third side wall and said fourth side wall, said first guide post and The second guide post is located on the same axis that is parallel to the axis of the developing roller.
A developer assembly according to claim 3, wherein said first guide post includes a first leg integrally connected to said third side wall and a detachably fitted to an outer end of said first leg a first end cap; the second guide post includes a second leg integrally connected to the fourth side wall and a second end cap removably fitted to the outer end of the second leg.
The developer assembly according to claim 4, wherein said first end cap is tightly fitted with a non-circular cross-section pin formed at an outer end of said first post through a non-circular hole; said second end cap A tight fit is formed by a non-circular aperture with a non-circular cross-section pin formed at the outer end of the second leg.
The developer assembly according to claim 5, wherein said non-circular hole is a D-shaped hole, and said non-circular cross-section pin is a D-shaped cross-section pin.
The developer assembly according to claim 1, wherein the developer assembly is provided with a drive gear set on one side wall of the developer assembly frame, the roller core of the developing roller having a drive pin adjacent to the drive gear a drive end of the set and a non-drive end remote from the drive gear set; the non-drive end of the roll core is supported on a side wall of the developer assembly frame by a roll core support, the non-drive end being A card slot is disposed on an outer side of the roller core bracket, and a card spring for restricting movement of the roller core bracket along the axial direction of the roller core is disposed in the card slot.
A developing cartridge for a laser image forming apparatus, which is formed by detachably combining a developer assembly and a drum assembly, the inside of a cover of the laser image forming apparatus having a pressure member for pressing the developer assembly toward the drum assembly Push the column;

The drum assembly includes a drum assembly frame and a photosensitive drum, the drum assembly frame having a first side wall, a second side wall, and a drum assembly handle connecting the two side walls, the photosensitive drum being rotatably supported at the Between the first side wall and the second side wall, the first side wall has a first positioning guide groove, and the second side wall has a second positioning guide groove;

The developer assembly includes: a developer assembly frame with a powder bin, the frame having a third side wall, a fourth side wall, and a rear wall pressable by the push column; rotatably supported on the a developing roller between the third side wall and the fourth side wall;

The first side wall is provided with a first guiding post that can cooperate with the first positioning guiding groove, and the fourth side wall is provided with a second guiding that can cooperate with the second positioning guiding groove. a post; the rear portion of the third side wall and/or the fourth side wall has a protrusion for supporting on the handle of the drum assembly; the rear wall has a rear wall that is engageable with the push column to limit The limiting rib of the developer component moving upward.
The developing cartridge according to claim 8, wherein said first guide post and said second guide post are respectively located at a front upper portion of said third side wall and said fourth side wall, said first guide post and said The two guiding columns are located on the same axis, the axis is parallel to the axis of the developing roller; the first guiding column comprises a first pillar integrally connected with the third sidewall and is detachably fitted to the first pillar a first end cap of the outer end of the post; the second guide post includes a second post integrally joined to the fourth side wall and a second end cap removably fitted to the outer end of the second post.
A developing cartridge according to claim 8, wherein said developer assembly is provided with a drive gear set on a side wall of said developer assembly frame, said roller core of said developing roller having said drive gear set a drive end and a non-drive end remote from the drive gear set; the non-drive end of the roll core is supported on a side wall of the developer assembly frame by a roll core support, the non-drive end being on the roll A card slot is disposed on an outer side of the core bracket, and a card spring for restricting movement of the roller core bracket along the axial direction of the roller core is disposed in the card slot.